CN106524551A

CN106524551A - Mass and flow measuring method and device of refrigerant in refrigerating system and measuring instrument

Info

Publication number: CN106524551A
Application number: CN201610978292.5A
Authority: CN
Inventors: 石文星; 王宝龙; 黄文宇; 张国辉; 李先庭; 丁连锐
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2016-11-07
Filing date: 2016-11-07
Publication date: 2017-03-22

Abstract

The invention provides a mass and flow measuring method and a device of a refrigerant in a refrigerating system and a measuring instrument. The method comprises the steps of: obtaining an intake temperature of a first compressor, an exhaust temperature of a second compressor, an evaporation pressure, a condensation pressure, shell surface temperatures of the first and second compressors, a surrounding environment temperature, a total consumption power, a spraying temperature, a first supercooling temperature, a second supercooling temperature and an oil content of a refrigerant mixture; calculating corresponding first, second, third, fourth and fifth enthalpy values, enthalpy value differences and total heat exchange quantities of the first and second compressors with external environment according to the obtained data; and calculating the mass and the flow of the refrigerant in the refrigerating system according to the first, second, third, fourth and fifth enthalpy values, the enthalpy value differences, the total consumption power, the total heat exchange quantities and the oil content of the refrigerant mixture. The method realizes non-invasion and high-precision measurement of the mass and the flow of the refrigerant in the refrigerating system, prevents adverse effect on the refrigerating system in the measuring process, and improves the user experience.

Description

Refrigerant mass fluxes measuring method, device and measuring instrument in a kind of refrigeration system

Technical field

The present invention relates to refrigeration system analysis field, and in particular to refrigerant mass fluxes measurement side in a kind of refrigeration system Method, device and measuring instrument.

Background technology

Refrigeration system is that a kind of heat by the object to be cooled with lower temperature is transferred to surrounding medium so as to obtain The working medium that thermal procession change (energy is changed and heat is shifted) is participated in the machine of cold, refrigeration system is referred to as cold-producing medium.System Cooling system is typically made up of compressor, condenser, evaporimeter and choke valve, and some refrigeration systems will also include intermediate pressure appearance Device (such as flash evaporation or intercooler).With the development of human society, in many instances, compressor operating is needed to exist Under the operating mode of big compression ratio, and traditional single stage compress technology occurs excessive discharge temperature, volume effect when compression ratio is larger The problems such as rate is low, and the application in refrigeration systems of quasi- twin-stage or Two-stage Compression technology can solve above-mentioned most of problem, Therefore the quasi- twin-stage with intermediate pressure container or Two-stage Compression unit are widely applied in refrigeration systems.

But due to the impact of the actual application environments such as weather conditions, installation site, service condition and loading condiction, above-mentioned band There is larger difference with test data of the producer in enthalpy difference laboratory in the refrigeration system scene runnability of intermediate pressure container. In order to ensure the actual motion performance of refrigeration system, refrigeration system of the acquisition with intermediate pressure container is in actual motion in real time Operational factor is just particularly important.Refrigerant mass fluxes are to judge important parameter that whether refrigeration system is normally run, mesh The front metering system for refrigerant mass fluxes is but this method uncomfortable obtaining by coriolis mass flowmeters For the in-site measurement of unit performance, which main reason is that：Coriolis mass flowmeters need to be welded on condensator outlet Liquid pipe on, damage to the refrigeration system unit that is currently running, user's acceptance is poor.

Therefore, in how overcoming prior art, refrigerant mass fluxes measuring method can destroy lacking for refrigeration system unit Fall into, become a technical problem urgently to be resolved hurrily.

The content of the invention

Therefore, the technical problem to be solved in the present invention is that refrigerant mass fluxes measuring method of the prior art can be broken Bad refrigeration system unit, affects the normal operation of refrigeration system.

In view of this, the first aspect of the embodiment of the present invention provides a kind of survey of refrigerant mass fluxes in refrigeration system Amount method, the refrigeration system include：Evaporimeter, the first compressor, the second compressor, condenser, intermediate pressure container and section Stream valve, the entrance of outlet connection first compressor of the evaporimeter, the outlet connection of first compressor described the The entrance of two compressors, the entrance of the outlet connection condenser of second compressor, methods described include：Obtain described The delivery temperature of the suction temperature of the first compressor and second compressor；Obtain the evaporating pressure of the refrigeration system and cold Solidifying pressure；Obtain the environment temperature around the first, second compressor housing surface temperature, first, second compressor With the total consumed power of first, second compressor；The gaseous refrigerant that acquisition is ejected from the intermediate pressure container Injection temperation；Obtain the first supercooling temperature of cold-producing medium at the condensator outlet；Obtain the oil content of refrigerant mixture； First enthalpy of cold-producing medium at the first compressor air suction mouth is calculated according to the evaporating pressure and the suction temperature； The second enthalpy for obtaining second compressor is calculated according to the condensing pressure and the delivery temperature；According to the injection temperature Degree is calculated the 4th enthalpy of the 3rd enthalpy and liquid refrigerant of gaseous state saturation cold-producing medium in the intermediate pressure container；Root The 5th enthalpy of cold-producing medium at the condensator outlet is calculated according to first supercooling temperature and the condensing pressure；According to The suction temperature, the delivery temperature are calculated and obtain the exhaust outlet of second compressor and the air-breathing of first compressor The enthalpy of the lubricating oil at mouthful is poor；According to the first, second compressor housing surface temperature and first, second compressor The environment temperature of surrounding is calculated total heat exchange amount of first and second compressor and external environment；According to described first and second, 3rd, four, five enthalpies, the enthalpy be poor, the total consumed power and total heat exchange amount and the refrigerant mixture contain Oil cut rate is calculated refrigerant mass fluxes in the refrigeration system.

Preferably, according to described first, second, third and fourth, five enthalpies, the poor enthalpy, the total consumed power and described total During the oil content of heat exchange amount and the refrigerant mixture is calculated the refrigeration system, refrigerant mass fluxes include：Adopt The mass flow of the first refrigerant mixture for flowing through first compressor is calculated with equation below：

The mass flow of the second refrigerant mixture for flowing through second compressor is calculated using equation below：

The first refrigerant mass fluxes for flowing through first compressor are calculated using equation below：

m_r,low=m_mix,low·(1-λ)

The second refrigerant mass flow for flowing through second compressor is calculated using equation below：

m_r,high=m_mix,high·(1-λ)

Wherein, m_mix,lowIt is the mass flow of first refrigerant mixture, m_mix,highIt is that the second refrigerant is mixed The mass flow of compound, m_r,lowIt is first refrigerant mass fluxes, m_r,highIt is the second refrigerant mass flow, E_com It is the total consumed power；It is total heat exchange amount；h₁It is first enthalpy, h₂It is second enthalpy, h₃It is described 3rd enthalpy, h₄It is the 4th enthalpy, h₅It is the 5th enthalpy, h_2,oil-h_1,oilIt is that the enthalpy is poor, λ is the refrigeration The oil content of agent composition.

Preferably, the oil content for obtaining refrigerant mixture includes：Collection flows through the cold-producing medium of the condenser and mixes The first refractive index of compound and flow through the evaporimeter refrigerant mixture the second refractive index；According to first and second folding The rate of penetrating is calculated the oil content of the refrigerant mixture.

Preferably, the evaporating pressure and condensing pressure for obtaining the refrigeration system includes：Gather the evaporimeter and First and second saturation temperature of cold-producing medium in the two-phase section of the condenser；Vapor pres- sure is calculated according to first saturation temperature Power, calculates condensing pressure according to second saturation temperature.

Preferably, the evaporating pressure and condensing pressure for obtaining the refrigeration system includes：Gather first compression The pressure of inspiration(Pi) of machine obtains the evaporating pressure；The pressure at expulsion for gathering second compressor obtains the condensing pressure.

Preferably, also include when the intermediate pressure container is intercooler：Obtain the intercooler outlet Second supercooling temperature at place；4th enthalpy is calculated according to second supercooling temperature.

The second aspect of the embodiment of the present invention provides a kind of measurement apparatus of refrigerant mass fluxes in refrigeration system, institute Stating refrigeration system includes：Evaporimeter, the first compressor, the second compressor, condenser, intermediate pressure container and choke valve, it is described The entrance of outlet connection first compressor of evaporimeter, outlet connection second compressor of first compressor Entrance, the entrance of the outlet connection condenser of second compressor, described device include：First acquisition module, is used for Obtain the delivery temperature of the suction temperature and second compressor of first compressor；Obtain the evaporation of the refrigeration system Pressure and condensing pressure；Obtain around the first, second compressor housing surface temperature, first, second compressor The total consumed power of environment temperature and first, second compressor；The gas that acquisition is ejected from the intermediate pressure container The injection temperation of state cold-producing medium；Obtain the first supercooling temperature of cold-producing medium at the condensator outlet；Obtain refrigerant mixture Oil content；First computing module, for being calculated first compression according to the evaporating pressure and the suction temperature First enthalpy of cold-producing medium at machine air entry；Calculated according to the condensing pressure and the delivery temperature and obtain second compression Second enthalpy of machine；3rd enthalpy of gaseous state saturation cold-producing medium in the intermediate pressure container is calculated according to the injection temperation 4th enthalpy of value and liquid refrigerant；The condenser is calculated according to first supercooling temperature and the condensing pressure 5th enthalpy of exit cold-producing medium；Calculated according to the suction temperature, the delivery temperature and obtain second compressor The enthalpy of the lubricating oil at exhaust outlet and the air entry of first compressor is poor；According to first, second compressor housing Environment temperature around surface temperature and first, second compressor is calculated first and second compressor with extraneous ring Total heat exchange amount in border；Second computing module, for poor, described total according to described first, second, third and fourth, five enthalpies, the enthalpy The oil content of power consumption and total heat exchange amount and the refrigerant mixture freezes in being calculated the refrigeration system Agent mass flow.

Preferably, second computing module includes：First computing unit, is flowed through for being calculated using equation below The mass flow of the first refrigerant mixture of first compressor：

Second computing unit, is mixed for the second refrigerant for flowing through second compressor is calculated using equation below The mass flow of compound：

3rd computing unit, for the first cold-producing medium matter for flowing through first compressor is calculated using equation below Amount flow：

m_r,low=m_mix,low·(1-λ)

4th computing unit, for the second refrigerant matter for flowing through second compressor is calculated using equation below Amount flow：

m_r,high=m_mix,high·(1-λ)

Preferably, first acquisition module includes：First collecting unit, flows through the refrigeration of the condenser for collection The first refractive index of agent composition and flow through the evaporimeter refrigerant mixture the second refractive index；5th computing unit, For the oil content of the refrigerant mixture is calculated according to first and second refractive index.

Preferably, first acquisition module also includes：Second collecting unit, for gathering the evaporimeter and described cold First and second saturation temperature of cold-producing medium in the two-phase section of condenser；6th computing unit, based on according to first saturation temperature Evaporating pressure is calculated, condensing pressure is calculated according to second saturation temperature.

Preferably, first acquisition module also includes：3rd collecting unit, for gathering the suction of first compressor Atmospheric pressure obtains the evaporating pressure；4th collecting unit, the pressure at expulsion for gathering second compressor obtain described Condensing pressure.

Preferably, also include when the intermediate pressure container is intercooler：Second acquisition module, for obtaining State second supercooling temperature in intercooler exit；3rd computing module, for being calculated according to second supercooling temperature To the 4th enthalpy.

The third aspect of the embodiment of the present invention provides a kind of measuring instrument of refrigerant mass fluxes in refrigeration system, described Refrigeration system includes：Evaporimeter, the first compressor, the second compressor, condenser, intermediate pressure container and choke valve, the steaming The entrance of outlet connection first compressor of device is sent out, the outlet of first compressor connects entering for second compressor Mouthful, the entrance of the outlet connection condenser of second compressor, the measuring instrument include：Pressure acquisition device, including：If Put the first pressure sensor and the second pressure for being arranged on second exhaust outlet of compressor in the first compressor air suction mouth Force snesor, the pressure at expulsion of the pressure of inspiration(Pi) and second compressor that are respectively used to gather first compressor；Temperature Collector, including：First temperature sensor, is arranged on the evaporator outlet, for gathering the air-breathing of first compressor Temperature；Second temperature sensor, is arranged on the condenser inlet, for gathering the delivery temperature of second compressor；The Three-temperature sensor, is arranged at the intermediate pressure container intermediate injection mouth, for collection from the intermediate pressure container The injection temperation of the gaseous refrigerant for ejecting；4th temperature sensor, is arranged on the first and second compressor housing surface, For gathering the first and second compressor housing surface temperature；5th temperature sensor, for gathering first and second compression Environment temperature around machine；6th temperature sensor, is arranged at the condensator outlet, for gathering the condensator outlet First supercooling temperature of place's cold-producing medium；Energy harvester, including compressor horsepower sensor, for gathering first and second pressure The total consumed power of contracting machine；Processor, is distinguished with the pressure acquisition device, the Temperature sampler and the energy harvester Connection, for obtaining the gathered data of the pressure acquisition device, the Temperature sampler and the energy harvester and described The oil content of refrigerant mixture in refrigeration system, and freeze using in the refrigeration system described in embodiment of the present invention first aspect Agent mass flow measurement methods calculate refrigerant mass fluxes in the refrigeration system.

Preferably, also include：First optical pickocff, first optical pickocff are arranged on the outlet of the condenser Place, flows through the first refractive index of the refrigerant mixture of the condenser for collection.

Preferably, also include：Second optical pickocff, second optical pickocff are arranged on the intermediate pressure container Exit, for collection flow through the evaporimeter refrigerant mixture the second refractive index.

Preferably, the processor is additionally operable to according to the first refractive index and second refractive index are calculated The oil content of refrigerant mixture.

Preferably, the processor is additionally operable to be calculated condensing pressure according to the pressure at expulsion, according to the air-breathing Calculation of pressure obtains evaporating pressure.

Preferably, the Temperature sampler also includes：7th temperature sensor, is arranged on the two-phase section of the evaporimeter, For gathering the first saturation temperature of cold-producing medium in the two-phase section of the evaporimeter；8th temperature sensor, is arranged on described cold The two-phase section of condenser, for gathering the second saturation temperature of cold-producing medium in the two-phase section of the condenser；And the processor Be additionally operable to evaporating pressure be calculated according to first saturation temperature, condensing pressure is calculated according to second saturation temperature.

Preferably, when the intermediate pressure container is intercooler, the Temperature sampler also includes：9th temperature Sensor, is arranged on the exit of the intercooler, for gathering the second supercooling temperature in the intercooler exit Degree.

Technical scheme has advantages below：

1st, refrigerant mass fluxes measuring method, device and measuring instrument in the refrigeration system that the present invention is provided, by pressing Different sensors in power collector, Temperature sampler, energy harvester arrange relevant position in refrigeration systems, adopt in real time Each related operational factor of collection refrigeration system, and operational factor is transmitted to processor, processor is according to each operational factor The flow of cold-producing medium in the refrigeration system is calculated, thus, realize invading to the non-of refrigerant mass fluxes in refrigeration system Enter formula, high-acruracy survey, compared with prior art, the program is simple to operate, it is real by the original paper that need not be destroyed in refrigeration system Existing data acquisition, it is to avoid measurement process improves Consumer's Experience to the harmful effect that brings of normal operation of refrigeration system.

2nd, refrigerant mass fluxes measuring method, device and measuring instrument in the refrigeration system that the present invention is provided, accessed Refrigeration system status data and its intermediate computations parameter can be not only used for calculate refrigerant mass fluxes, can also for survey Other performance parameters of amount refrigeration system offer precise data reference.

Description of the drawings

In order to be illustrated more clearly that the specific embodiment of the invention or technical scheme of the prior art, below will be to concrete Needed for embodiment or description of the prior art, accompanying drawing to be used is briefly described, it should be apparent that, in describing below Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid Put, can be with according to these other accompanying drawings of accompanying drawings acquisition.

Flow charts of the Fig. 1 for the measuring method of refrigerant mass fluxes in the refrigeration system of the embodiment of the present invention 1；

Block diagrams of the Fig. 2 for the measurement apparatus of refrigerant mass fluxes in the refrigeration system of the embodiment of the present invention 2；

Block diagrams of the Fig. 3 for the measuring instrument of refrigerant mass fluxes in the refrigeration system of the embodiment of the present invention 3；

Schematic diagrams of the Fig. 4 for the Two-stage Compression unit refrigeration system with flash evaporation of the embodiment of the present invention 3；

Schematic diagrams of the Fig. 5 for the Two-stage Compression unit refrigeration system with intercooler of the embodiment of the present invention 3；

Reference：41- evaporimeters, the first compressors of 421-, the second compressors of 422-, 43- condensers, 44- flash evaporations, 45- choke valves, 46- intercoolers, 311- first pressure sensors, 312- second pressure sensors, the first temperature of 321- are passed Sensor, 322 second temperature sensors, 323- three-temperature sensors, 324 the 4th temperature sensors, the 5th TEMPs of 325- Device, the 6th temperature sensors of 326-, the 7th temperature sensors of 327-, the 8th temperature sensors of 328-, the 9th TEMPs of 329- Device, 33- energy harvesters, 34- processors, the first optical pickocffs of 35-, the second optical pickocffs of 36-.

Specific embodiment

Technical scheme is clearly and completely described below in conjunction with accompanying drawing, it is clear that described enforcement Example is a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, ordinary skill The every other embodiment obtained under the premise of creative work is not made by personnel, belongs to the scope of protection of the invention.

In describing the invention, it should be noted that term " first ", " second " are only used for describing purpose, and can not It is interpreted as indicating or implies relative importance.

As long as additionally, the non-structure each other of technical characteristic involved in invention described below different embodiments Can just be combined with each other into conflict.

Embodiment 1

The present embodiment provides a kind of measuring method of refrigerant mass fluxes in refrigeration system, and refrigeration system includes evaporation Device, the first compressor, the second compressor, condenser, intermediate pressure container (intermediate pressure container can be flash evaporation herein, Can be intercooler) and choke valve, the entrance of outlet first compressor of connection of evaporimeter, the outlet of the first compressor connect Connect the entrance of the second compressor, the entrance of the outlet connection condenser of the second compressor, as shown in figure 1, method following steps：

S1：Obtain the delivery temperature of the suction temperature and the second compressor of the first compressor；Obtain the evaporation of refrigeration system Pressure and condensing pressure；Obtain the environment temperature around first, second compressor housing surface temperature, first, second compressor With the total consumed power of first, second compressor；The injection temperature of the gaseous refrigerant that acquisition is ejected from intermediate pressure container Degree；Obtain the first supercooling temperature of cold-producing medium at condensator outlet；Obtain the oil content of refrigerant mixture；As a kind of preferred Scheme, also include when the intermediate pressure container is intercooler：Obtain second mistake in the intercooler exit Cold temperature；Specifically, corresponding pressure sensor or TEMP are arranged in the relevant position that can pass through in refrigeration systems Device etc., the above-mentioned parameters of Real-time Collection, as a kind of preferred version, can be in the air entry of the first compressor and the second compression The exhaust outlet arrangement pressure sensor of machine, in actual applications, in error allowed band, typically can be by the value of pressure of inspiration(Pi) Evaporating pressure is approximately equal to, the value of pressure at expulsion is approximately equal to condensing pressure, therefore can pass through to gather the suction of the first compressor Atmospheric pressure obtains evaporating pressure, and the pressure at expulsion for gathering the second compressor obtains condensing pressure.

S2：First enthalpy of cold-producing medium at the first compressor air suction mouth is calculated according to evaporating pressure and suction temperature； Second enthalpy of the exhaust ports cold-producing medium for obtaining the second compressor is calculated according to condensing pressure and delivery temperature；If intermediate pressure Force container is flash evaporation, then according to injection temperation be calculated in intermediate pressure container the 3rd enthalpy of gaseous state saturation cold-producing medium and 4th enthalpy of liquid refrigerant, if intermediate pressure container is intercooler, calculates according to second supercooling temperature Obtain the 4th enthalpy；5th enthalpy of cold-producing medium at condensator outlet is calculated according to the first supercooling temperature and condensing pressure Value；The profit at the air entry of the exhaust outlet and the first compressor that obtain the second compressor is calculated according to suction temperature, delivery temperature The enthalpy of lubricating oil is poor；According to first, second compressor housing surface temperature and the environment temperature meter around first, second compressor Calculation obtains total heat exchange amount of first and second compressor and external environment；Specifically, evaporating pressure and condensing pressure can be by steps S1 In pressure of inspiration(Pi) and pressure at expulsion obtain, as pressure of inspiration(Pi) and pressure at expulsion are the data of Real-time Collection, with reference to corresponding Temperature directly calculates corresponding enthalpy, improves computational accuracy.Used as a kind of preferred version, the calculating of heat exchange amount can be adopted Equation below：

In above formula, T_comIt is first, second compressor housing surface temperature, T_airIt is the ring around first, second compressor Border temperature,Total heat exchange amount, a be compressor housing with the convection transfer rate of surrounding environment (visual site environment is chosen, Such as can choose between 5～8, unit is W/ (m²K)), A_comFor the surface area of first and second compressor, unit is m²；σ is Radiation Boltzmann constant, σ=5.67 × 10^-8, unit is W/ (m²K⁴)。

S3：Mixed according to first, second, third and fourth, five enthalpies, poor enthalpy, total consumed power and total heat exchange amount and cold-producing medium The oil content of thing is calculated refrigerant mass fluxes in refrigeration system.Used as a kind of preferred version, step S3 can specifically be wrapped Include：

The mass flow of the first refrigerant mixture for flowing through the first compressor is calculated using equation below：

The mass flow of the second refrigerant mixture for flowing through the second compressor is calculated using equation below：

Further, the first refrigerant mass fluxes for flowing through the first compressor are calculated using equation below：

m_r,low=m_mix,low·(1-λ)

Further, the second refrigerant mass flow for flowing through the second compressor is calculated using equation below：

m_r,high=m_mix,high·(1-λ)

In aforementioned four formula, wherein, m_mix,lowIt is the mass flow of first refrigerant mixture, m_mix,highIt is institute State the mass flow of second refrigerant mixture, m_r,lowIt is first refrigerant mass fluxes, m_r,highIt is second refrigeration Agent mass flow, E_comIt is the total consumed power；It is total heat exchange amount；h₁It is first enthalpy, h₂It is described Two enthalpies, h₃It is the 3rd enthalpy, h₄It is the 4th enthalpy, h₅It is the 5th enthalpy, h_2,oil-h_1,oilIt is the enthalpy Difference, λ is the oil content of the refrigerant mixture.

Used as a kind of preferred version, step S1 can include：Collection flows through the first folding of the refrigerant mixture of condenser Penetrate rate and flow through the second refractive index of the refrigerant mixture of evaporimeter；Cold-producing medium is calculated according to first and second refractive index to mix The oil content of compound.The oil content of the refrigerant mixture i.e. in step S1 can be general by inquire about database obtain, Can pass through to arrange the respective indices of refraction of first and second optical pickocff Real-time Collection refrigerant mixture in refrigeration systems, enter And the oil content of more accurate refrigerant mixture is calculated according to corresponding refractive index.

Used as a kind of preferred version, step S1 can also include：Cold-producing medium in the two-phase section of collection evaporimeter and condenser First and second saturation temperature；Evaporating pressure is calculated according to the first saturation temperature, condensation pressure is calculated according to the second saturation temperature Power.Evaporating pressure and condensing pressure i.e. in step S1 can also be obtained by first and second saturation temperature, such as in refrigeration system In in the case of no pressure sensor interface, can be with direct measurement first and second saturation temperature, and then can be according to following public affairs Formula is calculated evaporating pressure and condensing pressure, and (evaporating pressure is identical with condensing pressure Computing Principle, can adopt same public affairs Formula is calculated)：

P_s=exp (a₁+a₂/(t_s+a₃))

In above formula, P_sIt is evaporating pressure or condensing pressure, unit is Pascal；t_sIt is that the first saturation temperature or second are full And temperature, unit for degree Celsius；a₁、a₂、a₃It is the Physical Constants relevant with cold-producing medium, it is possible to use relative computer software is intended Conjunction is obtained.

The measuring method of refrigerant mass fluxes in the refrigeration system that the present embodiment is provided, by obtaining refrigeration system in real time Items correlation operational factor, and refrigerant mass fluxes in the refrigeration system are calculated according to each operational factor, thus, Realize to the non-intrusion type of refrigerant mass fluxes, high-acruracy survey in refrigeration system, wherein vapor pres- sure can with condensing pressure To obtain by corresponding pressure acquisition data or corresponding temperature data two ways, the quality for calculating cold-producing medium is improve Flow flexibility, every status data and its intermediate computations parameter of the refrigeration system accessed by the program can be not only used for Refrigerant mass fluxes are calculated, can also be that other performance parameters of measurement refrigeration system offer precise data reference.

Embodiment 2

The present embodiment provides a kind of measurement apparatus of refrigerant mass fluxes in refrigeration system, and refrigeration system includes：Evaporation Device, the first compressor, the second compressor, condenser, intermediate pressure container (intermediate pressure container can be flash evaporation herein, Can be intercooler) and choke valve, the entrance of outlet first compressor of connection of evaporimeter, the outlet of the first compressor connect Connect the entrance of the second compressor, the entrance of the outlet connection condenser of the second compressor, as shown in Fig. 2 device includes：

First acquisition module 21, for obtaining the delivery temperature of the suction temperature and the second compressor of the first compressor；Obtain Take the evaporating pressure and condensing pressure of refrigeration system；Obtain first, second compressor housing surface temperature, first, second compression The total consumed power of environment temperature and first, second compressor around machine；The gas that acquisition is ejected from intermediate pressure container The injection temperation of state cold-producing medium；Obtain the first supercooling temperature of cold-producing medium at condensator outlet；Obtain containing for refrigerant mixture Oil cut rate；Used as a kind of preferred version, the first acquisition module 21 also includes：3rd collecting unit 215, for gathering the first compressor Pressure of inspiration(Pi) obtain evaporating pressure；4th collecting unit 216, the pressure at expulsion for gathering the second compressor obtain condensation pressure Power.As a kind of preferred version, also include when the intermediate pressure container is intercooler：Second acquisition module 24, uses In the second supercooling temperature for obtaining the intercooler exit；Referring specifically to the detailed description in embodiment 1 to step S1.

First computing module 22, for being calculated system at the first compressor air suction mouth according to evaporating pressure and suction temperature First enthalpy of cryogen；The second of the exhaust ports cold-producing medium for obtaining the second compressor is calculated according to condensing pressure and delivery temperature Enthalpy；3rd enthalpy and liquid refrigerant of gaseous state saturation cold-producing medium in intermediate pressure container are calculated according to injection temperation 4th enthalpy；5th enthalpy of cold-producing medium at condensator outlet is calculated according to the first supercooling temperature and condensing pressure；According to Suction temperature, delivery temperature calculate the enthalpy of the lubricating oil at the air entry of the exhaust outlet and the first compressor that obtain the second compressor Value difference；Is calculated according to first, second compressor housing surface temperature and the environment temperature around first, second compressor First, total heat exchange amount of two compressors and external environment.As a kind of preferred version, it is cooling during rolling in the intermediate pressure container Also include the 3rd computing module 25 during device, for the 4th enthalpy being calculated according to second supercooling temperature.It is concrete to join See the detailed description to step S2 in embodiment 1.

Second computing module 23, for according to first, second, third and fourth, five enthalpies, poor enthalpy, total consumed power and total heat exchange The oil content of amount and refrigerant mixture is calculated refrigerant mass fluxes in refrigeration system.As a kind of preferred version Two computing modules 23 can include：

First computing unit 231, is mixed for the first cold-producing medium for flowing through the first compressor is calculated using equation below The mass flow of compound：

Second computing unit 232, is mixed for the second refrigerant for flowing through the second compressor is calculated using equation below The mass flow of compound：

3rd computing unit 233, for the first cold-producing medium matter for flowing through the first compressor is calculated using equation below Amount flow：

m_r,low=m_mix,low·(1-λ)

4th computing unit 234, for the second refrigerant matter for flowing through the second compressor is calculated using equation below Amount flow：

m_r,high=m_mix,high·(1-λ)

Used as a kind of preferred version, the first acquisition module 21 includes：First collecting unit 211, flows through condensation for collection The first refractive index of the refrigerant mixture of device and flow through evaporimeter refrigerant mixture the second refractive index；5th calculates single Unit 212, for the oil content of refrigerant mixture is calculated according to first and second refractive index.Referring specifically in embodiment 1 to step The detailed description of the preferred version of rapid S1.

Used as a kind of preferred version, the first acquisition module 21 also includes：Second collecting unit 213, for gathering evaporimeter With first and second saturation temperature of cold-producing medium in the two-phase section of condenser；6th computing unit 214, for according to the first saturation temperature Degree calculates evaporating pressure, calculates condensing pressure according to the second saturation temperature.Referring specifically in embodiment 1 to the another of step S1 The detailed description of one preferred version.

The measurement apparatus of refrigerant mass fluxes in the refrigeration system that the present embodiment is provided, by obtaining refrigeration system in real time Items correlation operational factor, and refrigerant mass fluxes in the refrigeration system are calculated according to each operational factor, thus, Realize to the non-intrusion type of refrigerant mass fluxes, high-acruracy survey in refrigeration system, wherein vapor pres- sure can with condensing pressure To obtain by corresponding pressure acquisition data or corresponding temperature data two ways, calculating refrigerant mass flow is improve The flexibility of amount, every status data and its intermediate computations parameter of the refrigeration system accessed by the program can be not only used for Refrigerant mass fluxes are calculated, can also be that other performance parameters of measurement refrigeration system offer precise data reference.

Embodiment 3

The present embodiment provides a kind of measuring instrument of refrigerant mass fluxes in refrigeration system, as shown in figure 3, device includes： Processor 34 and the pressure acquisition device 31 being connected with processor 34, Temperature sampler 32 and energy harvester 33, are answered actual With in, by pressure acquisition device 31, Temperature sampler 32 and energy harvester 33 are deployed in the refrigeration system respectively, it is right to come The operational factor of the refrigeration system carries out Real-time Collection, as shown in figure 4, the refrigeration system can include：Evaporimeter 41, first is pressed Contracting machine 421, the second compressor 422, condenser 43, flash evaporation 44 (i.e. flash evaporation 44 is intermediate pressure container herein) and choke valve 45, the entrance of outlet first compressor 421 of connection of evaporimeter 41, the outlet of the first compressor 421 connect the second compressor 422 Entrance, the entrance of the outlet connection condenser 43 of the second compressor 422, below with as shown in Figure 4 with flash evaporation 44 As a example by Two-stage Compression unit refrigeration system, the technical scheme of the present embodiment is described in detail：

Pressure acquisition device 31, including：It is arranged on the first pressure sensor 311 of 421 air entry of the first compressor and arranges In the second pressure sensor 312 of 422 exhaust outlet of the second compressor, it is respectively used to gather the pressure of inspiration(Pi) of the first compressor 421 With the pressure at expulsion of the second compressor 422, in actual applications, first and second pressure sensor herein can be according to actual need The first compressor 421, the relevant position of the one or two compressor are deployed in respectively, to ensure the accuracy of gathered data.

Temperature sampler 32, including：First temperature sensor 321, is arranged on evaporimeter 41 and exports, and presses for collection first The suction temperature of contracting machine 421；Second temperature sensor 322, is arranged on 43 entrance of condenser, for gathering the second compressor 422 Delivery temperature；Three-temperature sensor 323, is arranged at intermediate pressure container intermediate injection mouth, for collection from intermediate pressure The injection temperation of the gaseous refrigerant ejected in force container；4th temperature sensor 324, is arranged on first and second compression case Body surface face, for gathering first and second compressor housing surface temperature；5th temperature sensor 325, presses for collection first and second Environment temperature around contracting machine；6th temperature sensor 326, is arranged on 43 exit of condenser, goes out for gathering condenser 43 First supercooling temperature of cold-producing medium at mouthful；Herein, Temperature sampler 32 is mainly used in the temperature for gathering relevant position in refrigeration system Degree parameter, using when can determine the particular location of each sensor according to actual needs, these temperature parameters can be used as meter Calculate the reference factor of refrigerant mass fluxes.

As a kind of preferred version, as shown in figure 5, when the intermediate pressure container is intercooler 46, the temperature Degree collector 32 also includes：9th temperature sensor 329, is arranged on the exit of the intercooler 46, for gathering Second supercooling temperature in 46 exit of intercooler is stated, the second supercooling temperature can in the calculating of refrigerant mass fluxes herein The enthalpy of the liquid refrigerant for being calculated in intercooler 46.

Energy harvester 33, including compressor horsepower sensor, for gathering the first compressor 421 and the second compressor 422 total consumed power, using as the major parameter for calculating refrigerant mass fluxes.

Processor 34, is connected with pressure acquisition device 31, Temperature sampler 32 and energy harvester 33, respectively for obtaining Refrigerant mixture in the gathered data and refrigeration system of pressure acquisition device 31, Temperature sampler 32 and energy harvester 33 Oil content, and the measuring method using refrigerant mass fluxes in the refrigeration system in embodiment 1 calculates system in refrigeration system Cryogen mass flow.Used as a kind of preferred version, processor 34 is additionally operable to be calculated condensing pressure according to pressure at expulsion, according to Pressure of inspiration(Pi) is calculated and obtains evaporating pressure.Specifically, first, condensing pressure is calculated according to pressure at expulsion, according to pressure of inspiration(Pi) Power is calculated evaporating pressure, in actual applications, in error allowed band, typically can be approximate etc. by the value of pressure of inspiration(Pi) In evaporating pressure, the value of pressure at expulsion is approximately equal to condensing pressure, then can be calculated according to evaporating pressure and suction temperature To the first air-breathing enthalpy h of 421 air entry cold-producing medium of the first compressor₁；Calculated according to condensing pressure and delivery temperature and obtain the Second enthalpy h of two compressors, 422 exhaust outlet cold-producing medium₂；Gaseous state in intermediate pressure container is calculated according to injection temperation to satisfy With the 3rd enthalpy h of cold-producing medium₃With the 4th enthalpy h of liquid refrigerant₄；As a kind of preferred version, hold in the intermediate pressure When device is flash evaporation 44 as shown in Figure 4, the 3rd of gaseous state saturation cold-producing medium in flash evaporation 44 the is calculated according to injection temperation Enthalpy h₃With the 4th enthalpy h of liquid refrigerant₄；As a kind of preferred version, it is as shown in Figure 5 in the intermediate pressure container Intercooler 46 when, the 3rd enthalpy of gaseous state saturation cold-producing medium in intercooler 46 can be calculated according to injection temperation Value h₃, the 4th enthalpy h of liquid refrigerant in intercooler 46 is calculated according to the second supercooling temperature₄.According to the first supercooling Temperature and condensing pressure are calculated the 5th enthalpy h of 43 exit cold-producing medium of condenser₅；According to suction temperature, delivery temperature The enthalpy difference h of the lubricating oil at the air entry of the exhaust outlet and the first compressor 421 that are calculated the second compressor 422_2,oil- h_1,oil；According to first, second compressor, 422 casing surface temperature T_comAnd first, second environment temperature around compressor 422 T_airIt is calculated total heat exchange amount of first and second compressor and external environmentSuch as heat exchange can be calculated using equation below Amount

In above formula, a is the convection transfer rate of first and second compressor housing and surrounding environment, and visual site environment is chosen (such as can choose between 5～8, unit is W/m²K)；A_comFor the surface area of first and second compressor, unit is m²；σ is spoke Penetrate Boltzmann constant, 5.67 × 10^-8, unit is W/ (m²K⁴).Finally, according to it is above-mentioned be calculated each intermediate parameters and The total consumed power E of the first compressor 421 and the second compressor 422_comWith the oil content λ of refrigerant mixture (cold-producing medium herein The oil content λ of mixture can be inquired about from database and be obtained, the value typically between 0.03%～5%) it is calculated refrigeration Agent mass flow, specifically, first can be calculated the first cold-producing medium mixing for flowing through the first compressor 421 using equation below Mass flow m of thing_mix,low：

The mass flow of the second refrigerant mixture for flowing through the second compressor 422 is calculated using equation below m_mix,high：

And then the first refrigerant mass fluxes m for flowing through the first compressor 421 are calculated using equation below_r,low：

m_r,low=m_mix,low·(1-λ)

And second refrigerant mass flow m for flowing through the second compressor 422 is calculated using equation below_r,high：

m_r,high=m_mix,high·(1-λ)

As a kind of preferred version, also include：First optical pickocff, for the refrigeration system for being reserved with optical sensor interface System, can flow through the refrigeration of condenser 43 for collection by the first optical pickocff to be arranged on the exit of condenser 43 The first refractive index of agent composition, the first refractive index can be used for the oil content for calculating refrigerant mixture, and which is to adopt in real time The data of collection, can improve the accuracy of result of calculation.

As a kind of preferred version, also include：Second optical pickocff, for the refrigeration system for being reserved with optical sensor interface System, the second optical pickocff can also be arranged on the exit of intermediate pressure container, flow through the system of evaporimeter 41 for collection Second refractive index of refrigerant mixture, second refractive index can be used for the oil content for calculating refrigerant mixture, and which is real-time The data of collection, can improve the accuracy of result of calculation.

Used as a kind of preferred version, processor 34 is additionally operable to be calculated refrigeration according to first refractive index and the second refractive index The oil content of agent composition.The oil content of i.e. above-mentioned refrigerant mixture can be general by inquire about database obtain, also may be used To pass through the respective indices of refraction of the second optical pickocff Real-time Collection refrigerant mixture, and then calculate more accurate system The oil content of refrigerant mixture.

Used as a kind of preferred version, Temperature sampler 32 also includes：7th temperature sensor 327, is arranged on evaporimeter 41 Two-phase section, for gathering the first saturation temperature of cold-producing medium in the two-phase section of evaporimeter 41；8th temperature sensor 328, if The two-phase section in condenser 43 is put, for gathering the second saturation temperature of cold-producing medium in the two-phase section of condenser 43；And process Device 34 is additionally operable to calculate evaporating pressure according to the first saturation temperature, calculates condensing pressure according to the second saturation temperature.Make The evaporating pressure and condensing pressure of cooling system can also be obtained by first and second saturation temperature, such as do not had in refrigeration systems In the case of pressure sensor interface, with direct measurement first and second saturation temperature, and then can be calculated according to equation below (evaporating pressure is identical with condensing pressure Computing Principle, can be calculated using same formula to obtain evaporating pressure and condensing pressure Obtain)：

P_s=exp (a₁+a₂/(t_s+a₃))

In addition, the operational factor of the refrigeration system got in the present embodiment can also be the performance evaluation of refrigeration system carrying For the reference for enriching, such as calculated according to these operational factors in real time obtain the refrigerating capacity of refrigeration system, heating capacity and Energy Efficiency Ratio and other performance parameters, will not be described here.

The present embodiment provide refrigeration system in refrigerant mass fluxes measuring instrument, by by pressure acquisition device 31, temperature Different sensors in degree collector 32, energy harvester 33 arrange relevant position in refrigeration systems, Real-time Collection refrigeration The operational factor of system, and operational factor is transmitted to processor 34, processor 34 is calculated this according to each operational factor The flow of cold-producing medium in refrigeration system, thus, realizing to the non-intrusion type of refrigerant mass fluxes, high accuracy in refrigeration system Measurement, compared with prior art, the program is simple to operate, and the original paper that need not be destroyed in refrigeration system is capable of achieving data acquisition, The normal operation harmful effect that bring of the measurement process to refrigeration system is avoided, Consumer's Experience is improve, in addition, program institute The status data and its intermediate computations parameter of the refrigeration system for getting can be not only used for calculating refrigerant mass fluxes, may be used also Think that other performance parameters of measurement refrigeration system offer precise data reference.

Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.For For those of ordinary skill in the art, the change or change of other multi-forms can also be made on the basis of the above description It is dynamic.There is no need to be exhaustive to all of embodiment.And thus it is extended obvious change or change Among moving still in the protection domain of the invention.

Claims

1. in a kind of refrigeration system refrigerant mass fluxes measuring method, the refrigeration system includes：Evaporimeter, the first compression Machine, the second compressor, condenser, intermediate pressure container and choke valve, the outlet of the evaporimeter connect first compressor Entrance, the entrance of outlet connection second compressor of first compressor, the outlet connection of second compressor The entrance of the condenser, it is characterised in that methods described includes：

Obtain the delivery temperature of the suction temperature and second compressor of first compressor；Obtain the refrigeration system Evaporating pressure and condensing pressure；Obtain the first, second compressor housing surface temperature, first, second compressor week The environment temperature enclosed and the total consumed power of first, second compressor；Acquisition is ejected from the intermediate pressure container Gaseous refrigerant injection temperation；Obtain the first supercooling temperature of cold-producing medium at the condensator outlet；Obtain cold-producing medium to mix The oil content of compound；

First of cold-producing medium at the first compressor air suction mouth is calculated according to the evaporating pressure and the suction temperature Enthalpy；The of the exhaust ports cold-producing medium that obtains second compressor is calculated according to the condensing pressure and the delivery temperature Two enthalpies；3rd enthalpy and liquid of gaseous state saturation cold-producing medium in the intermediate pressure container are calculated according to the injection temperation 4th enthalpy of state cold-producing medium；It is calculated at the condensator outlet according to first supercooling temperature and the condensing pressure 5th enthalpy of cold-producing medium；The exhaust outlet for obtaining second compressor is calculated according to the suction temperature, the delivery temperature It is poor with the enthalpy of the lubricating oil at the air entry of first compressor；According to the first, second compressor housing surface temperature It is total with external environment that environment temperature around degree and first, second compressor is calculated first and second compressor Heat exchange amount；

According to described first, second, third and fourth, five enthalpies, the poor enthalpy, the total consumed power and total heat exchange amount and The oil content of the refrigerant mixture is calculated refrigerant mass fluxes in the refrigeration system.

2. in refrigeration system according to claim 1 refrigerant mass fluxes measuring method, it is characterised in that according to institute State poor first, second, third and fourth, five enthalpies, the enthalpy, the total consumed power and total heat exchange amount and the cold-producing medium During the oil content of mixture is calculated the refrigeration system, refrigerant mass fluxes include：

The mass flow of the first refrigerant mixture for flowing through first compressor is calculated using equation below：

m_{m i x, l o w} = \frac{(E_{c o m} - {\overset{\cdot}{Q}}_{l o s s}) \cdot (h_{5} - h_{3})}{(1 - λ) (h_{1} h_{3} - h_{1} h_{5} - h_{3} h_{2} + h_{3} h_{5} - h_{3} h_{4} + h_{2} h_{4}) + λ (h_{2, o i l} - h_{1, o i l})}

m_{m i x, h i g h} = \frac{(E_{c o m} - {\overset{\cdot}{Q}}_{l o s s}) \cdot (h_{4} - h_{3})}{(1 - λ) (h_{1} h_{3} - h_{1} h_{5} - h_{3} h_{2} + h_{3} h_{5} - h_{3} h_{4} + h_{2} h_{4}) + λ (h_{2, o i l} - h_{1, o i l})}

m_r,low=m_mix,low·(1-λ)

m_r,high=m_mix,high·(1-λ)

Wherein, m_mix,lowIt is the mass flow of first refrigerant mixture, m_mix,highIt is the second refrigerant mixture Mass flow, m_r,lowIt is first refrigerant mass fluxes, m_r,highIt is the second refrigerant mass flow, E_comIt is institute State total consumed power；It is total heat exchange amount；h₁It is first enthalpy, h₂It is second enthalpy, h₃It is the described 3rd Enthalpy, h₄It is the 4th enthalpy, h₅It is the 5th enthalpy, h_2,oil-h_1,oilIt is that the enthalpy is poor, λ is that the cold-producing medium is mixed The oil content of compound.

3. in refrigeration system according to claim 1 and 2 refrigerant mass fluxes measuring method, it is characterised in that institute The oil content for stating acquisition refrigerant mixture includes：

Collection flows through the first refractive index of the refrigerant mixture of the condenser and flows through the cold-producing medium mixing of the evaporimeter Second refractive index of thing；

The oil content of the refrigerant mixture is calculated according to first and second refractive index.

4. in refrigeration system according to any one of claim 1 to 3 refrigerant mass fluxes measuring method, its feature It is that the evaporating pressure and condensing pressure for obtaining the refrigeration system includes：

Gather first and second saturation temperature of cold-producing medium in the two-phase section of the evaporimeter and the condenser；

Evaporating pressure is calculated according to first saturation temperature, condensing pressure is calculated according to second saturation temperature.

5. in refrigeration system according to any one of claim 1 to 3 refrigerant mass fluxes measuring method, its feature It is that the evaporating pressure and condensing pressure for obtaining the refrigeration system includes：

The pressure of inspiration(Pi) for gathering first compressor obtains the evaporating pressure；

The pressure at expulsion for gathering second compressor obtains the condensing pressure.

6. in refrigeration system according to claim 1 and 2 refrigerant mass fluxes measuring method, it is characterised in that The intermediate pressure container also includes when being intercooler：

Obtain second supercooling temperature in the intercooler exit；

4th enthalpy is calculated according to second supercooling temperature.

7. in a kind of refrigeration system refrigerant mass fluxes measurement apparatus, the refrigeration system includes：Evaporimeter, the first compression Machine, the second compressor, condenser, intermediate pressure container and choke valve, the outlet of the evaporimeter connect first compressor Entrance, the entrance of outlet connection second compressor of first compressor, the outlet connection of second compressor The entrance of the condenser, it is characterised in that described device includes：

First acquisition module, for obtaining the delivery temperature of the suction temperature and second compressor of first compressor； Obtain the evaporating pressure and condensing pressure of the refrigeration system；Obtain the first, second compressor housing surface temperature, described The total consumed power of environment temperature and first, second compressor around first, second compressor；Obtain from the centre The injection temperation of the gaseous refrigerant ejected in pressure vessel；Obtain the first supercooling temperature of cold-producing medium at the condensator outlet Degree；Obtain the oil content of refrigerant mixture；

First computing module, for being calculated first compressor air suction according to the evaporating pressure and the suction temperature First enthalpy of cold-producing medium at mouthful；The row for obtaining second compressor is calculated according to the condensing pressure and the delivery temperature Second enthalpy of cold-producing medium at gas port；Gaseous state saturation refrigeration in the intermediate pressure container is calculated according to the injection temperation 3rd enthalpy and the 4th enthalpy of liquid refrigerant of agent；It is calculated according to first supercooling temperature and the condensing pressure 5th enthalpy of cold-producing medium at the condensator outlet；Calculated according to the suction temperature, the delivery temperature and obtain described the The enthalpy of the lubricating oil at the exhaust outlet of two compressors and the air entry of first compressor is poor；According to described first, second Environment temperature around compressor housing surface temperature and first, second compressor is calculated first and second compression Total heat exchange amount of machine and external environment；

Second computing module, for according to described first, second, third and fourth, five enthalpies, the poor enthalpy, the total consumed power and The oil content of total heat exchange amount and the refrigerant mixture is calculated refrigerant mass fluxes in the refrigeration system.

8. in refrigeration system according to claim 7 refrigerant mass fluxes measurement apparatus, it is characterised in that described Two computing modules include：

First computing unit, for the first refrigerant mixture for flowing through first compressor is calculated using equation below Mass flow：

m_{m i x, l o w} = \frac{(E_{c o m} - {\overset{\cdot}{Q}}_{l o s s}) \cdot (h_{5} - h_{3})}{(1 - λ) (h_{1} h_{3} - h_{1} h_{5} - h_{3} h_{2} + h_{3} h_{5} - h_{3} h_{4} + h_{2} h_{4}) + λ (h_{2, o i l} - h_{1, o i l})}

Second computing unit, for the second refrigerant mixture for flowing through second compressor is calculated using equation below Mass flow：

m_{m i x, h i g h} = \frac{(E_{c o m} - {\overset{\cdot}{Q}}_{l o s s}) \cdot (h_{4} - h_{3})}{(1 - λ) (h_{1} h_{3} - h_{1} h_{5} - h_{3} h_{2} + h_{3} h_{5} - h_{3} h_{4} + h_{2} h_{4}) + λ (h_{2, o i l} - h_{1, o i l})}

3rd computing unit, for the first refrigerant mass flow for flowing through first compressor is calculated using equation below Amount：

m_r,low=m_mix,low·(1-λ)

4th computing unit, for the second refrigerant quality stream for flowing through second compressor is calculated using equation below Amount：

m_r,high=m_mix,high·(1-λ)

9. in the refrigeration system according to claim 7 or 8 refrigerant mass fluxes measurement apparatus, it is characterised in that institute Stating the first acquisition module includes：

First collecting unit, flows through the first refractive index of the refrigerant mixture of the condenser and flows through the steaming for collection Send out the second refractive index of the refrigerant mixture of device；

5th computing unit, for the oil content of the refrigerant mixture is calculated according to first and second refractive index.

10. in the refrigeration system according to any one of claim 7 to 9 refrigerant mass fluxes measurement apparatus, which is special Levy and be, first acquisition module also includes：

Second collecting unit, for gathering first and second saturation of cold-producing medium in the two-phase section of the evaporimeter and the condenser Temperature；

6th computing unit, for calculating evaporating pressure according to first saturation temperature, according to second saturation temperature Calculate condensing pressure.

The measurement apparatus of refrigerant mass fluxes in 11. refrigeration systems according to any one of claim 7 to 9, which is special Levy and be, first acquisition module also includes：

3rd collecting unit, the pressure of inspiration(Pi) for gathering first compressor obtain the evaporating pressure；

4th collecting unit, the pressure at expulsion for gathering second compressor obtain the condensing pressure.

The measurement apparatus of refrigerant mass fluxes in 12. refrigeration systems according to claim 7 or 8, it is characterised in that The intermediate pressure container also includes when being intercooler：

Second acquisition module, for obtaining second supercooling temperature in the intercooler exit；

3rd computing module, for being calculated the 4th enthalpy according to second supercooling temperature.

The measuring instrument of refrigerant mass fluxes in a kind of 13. refrigeration systems, the refrigeration system include：Evaporimeter, the first compression Machine, the second compressor, condenser, intermediate pressure container and choke valve, the outlet of the evaporimeter connect first compressor Entrance, the entrance of outlet connection second compressor of first compressor, the outlet connection of second compressor The entrance of the condenser, it is characterised in that the measuring instrument includes：

Pressure acquisition device, including：It is arranged on the first pressure sensor of the first compressor air suction mouth and is arranged on described the The second pressure sensor of two exhaust outlet of compressor, is respectively used to gather the pressure of inspiration(Pi) and described second of first compressor The pressure at expulsion of compressor；

Temperature sampler, including：First temperature sensor, is arranged on the evaporator outlet, for gathering first compression The suction temperature of machine；Second temperature sensor, is arranged on the condenser inlet, for gathering the exhaust of second compressor Temperature；Three-temperature sensor, is arranged at the intermediate pressure container intermediate injection mouth, for collection from the intermediate pressure The injection temperation of the gaseous refrigerant ejected in container；4th temperature sensor, is arranged on first and second compressor housing Surface, for gathering the first and second compressor housing surface temperature；5th temperature sensor, for gathering described first and second Environment temperature around compressor；6th temperature sensor, is arranged at the condensator outlet, for gathering the condenser First supercooling temperature of exit cold-producing medium；

Energy harvester, including compressor horsepower sensor, for gathering the total consumed power of first and second compressor；

Processor, is connected with the pressure acquisition device, the Temperature sampler and the energy harvester, respectively for obtaining Freeze in the gathered data and the refrigeration system of the pressure acquisition device, the Temperature sampler and the energy harvester The oil content of agent composition, and measured using refrigerant mass fluxes in the refrigeration system any one of claim 1 to 6 Method calculates refrigerant mass fluxes in the refrigeration system.

The measuring instrument of refrigerant mass fluxes in 14. refrigeration systems according to claim 13, it is characterised in that also wrap Include：First optical pickocff, first optical pickocff are arranged on the exit of the condenser, flow through for collection described The first refractive index of the refrigerant mixture of condenser.

The measuring instrument of refrigerant mass fluxes in 15. refrigeration systems according to claim 14, it is characterised in that also wrap Include：Second optical pickocff, second optical pickocff are arranged on the exit of the intermediate pressure container, for gathering stream Second refractive index of the refrigerant mixture of evaporimeter described in Jing.

The measuring instrument of refrigerant mass fluxes in 16. refrigeration systems according to claim 15, it is characterised in that the place Reason device is additionally operable to the oil content of the refrigerant mixture is calculated according to the first refractive index and second refractive index.

The measuring instrument of refrigerant mass fluxes in 17. refrigeration systems according to any one of claim 13 to 15, which is special Levy and be, the processor is additionally operable to condensing pressure is calculated according to the pressure at expulsion, calculated according to the pressure of inspiration(Pi) Obtain evaporating pressure.

The measuring instrument of refrigerant mass fluxes in 18. refrigeration systems according to any one of claim 13 to 15, which is special Levy and be, the Temperature sampler also includes：7th temperature sensor, is arranged on the two-phase section of the evaporimeter, for gathering First saturation temperature of cold-producing medium in the two-phase section of the evaporimeter；8th temperature sensor, is arranged on the two of the condenser Phase region, for gathering the second saturation temperature of cold-producing medium in the two-phase section of the condenser；And the processor is additionally operable to root Evaporating pressure is calculated according to first saturation temperature, condensing pressure is calculated according to second saturation temperature.

The measuring instrument of refrigerant mass fluxes in 19. refrigeration systems according to any one of claim 13 to 15, which is special Levy and be, when the intermediate pressure container is intercooler, the Temperature sampler also includes：9th temperature sensor, The exit of the intercooler is arranged on, for gathering second supercooling temperature in the intercooler exit.