CN115143553B - Regulation and control method of small direct expansion type phase change cold storage air conditioner - Google Patents
Regulation and control method of small direct expansion type phase change cold storage air conditioner Download PDFInfo
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- 230000008859 change Effects 0.000 title claims abstract description 99
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- 239000012782 phase change material Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 238000009825 accumulation Methods 0.000 claims description 91
- 238000001816 cooling Methods 0.000 claims description 43
- 239000003507 refrigerant Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 19
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- 238000001704 evaporation Methods 0.000 abstract description 5
- 230000008020 evaporation Effects 0.000 abstract description 4
- 230000029087 digestion Effects 0.000 abstract 1
- 238000004378 air conditioning Methods 0.000 description 26
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- 238000005057 refrigeration Methods 0.000 description 3
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- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
- F24F5/0021—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice using phase change material [PCM] for storage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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Abstract
The invention discloses a regulation and control method of a small direct expansion type phase change cold storage air conditioner, and aims to solve the technical problem of how to cope with renewable energy power supply fluctuation of the direct expansion type air conditioner. The invention comprises a double-suction port compressor, a condenser, a matched fan thereof, an evaporator, a matched fan thereof and phase change cold storage equipment; according to the invention, the phase change material with the phase change temperature slightly higher than the evaporation temperature of the air conditioner is selected, and different regulation and control methods under 5 power supply quantity states are adopted, so that the flexibility of the power consumption requirement of the small direct expansion air conditioner is increased, the direct expansion air conditioner can cope with the power supply fluctuation of renewable energy sources, the renewable energy source digestion rate of the direct expansion air conditioner is improved, and the running carbon emission of the direct expansion air conditioner is reduced.
Description
Technical Field
The invention relates to the technical field of phase change cold accumulation, in particular to a regulating and controlling method of a small direct expansion type phase change cold accumulation air conditioner.
Background
On the one hand, the contradiction between the power supply and demand of air conditioning cooling of a building or other personnel activity space is serious; on the other hand, the fluctuation of renewable energy power generation is increasingly contradictory with the stability of power supply required by the traditional users, and the current situation of unbalanced power supply and demand is further affected. Therefore, the flexibility of the electricity consumption of the air conditioning equipment is improved, so that the electricity consumption of the air conditioning equipment is flexibly regulated and controlled along with the fluctuation of the renewable energy power generation, and the method has important significance for improving the renewable energy consumption rate and promoting the realization of the 'carbon neutralization' target.
The inventor knows a phase change cold accumulation device for an air conditioner (Chinese patent document CN 113218016A) which discloses a technology for improving heat exchange efficiency during cold accumulation and cold release through fin optimization. The technology is suitable for medium-large air conditioners, namely air conditioners containing chilled water systems.
However, in the process of implementing the technical solution in the embodiment of the present application, the present inventors have found that at least the following technical problems exist in the above technology: the sensible heat cold accumulation of water is utilized in the water cold accumulation technology, and the occupied volume is larger, so that the water cold accumulation technology is not suitable for small-sized direct expansion air conditioning equipment.
The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art.
Disclosure of Invention
The inventors found through research that: in the existing ice cold accumulation technology and the existing water cold accumulation technology have unsatisfactory implementation effects, in the ice cold accumulation technology, the main machine refrigerating temperature of an air conditioner cannot reach the ice making temperature, so that an additional ice making main machine is required to be additionally arranged; the sensible heat of water is utilized for cold accumulation in the water cold accumulation technology, and the occupied volume is larger. And the two techniques are not applicable to the direct expansion air conditioning equipment.
In view of at least one of the above technical problems, the present disclosure provides a small-sized direct expansion type phase change cold storage air conditioning system, by selecting a phase change material with a phase change temperature slightly higher than an evaporation temperature of an air conditioner, the latent heat cold storage of the material can be utilized, and meanwhile, the original refrigerator is directly utilized to store the phase change material cold, so that the advantages of ice cold storage and water cold storage are considered, the flexibility of the electricity demand of the small-sized direct expansion type air conditioner is increased, the direct expansion type air conditioner can cope with the power supply fluctuation of renewable energy sources, the renewable energy source absorption rate of the direct expansion type air conditioner is improved, and the running carbon emission of the direct expansion type air conditioner is reduced.
According to one aspect of the present disclosure, there is provided a regulation method of a small-sized direct expansion type phase change cold storage air conditioner including a phase change cold storage device including a phase change cold storage tank;
based on the fluctuation rule of power supply, the following regulation and control method is adopted:
with P Power supply Represents the power supply, Q User' s Representing a user cooling load; q (Q) Cold storage box Represents the cold load of cold accumulation of the cold accumulation box, Q Cold storage box max Representing a maximum cold storage load; COP represents the energy efficiency ratio of the system, i.e. the ratio of the cooling capacity to the power supply capacity;
(1) When (when)When the phase-change cold storage box is in a full-load cold storage state, the evaporator fully bears indoor cold load;
(2) When (when)When in use; the evaporator fully bears indoor cold load and makes the phase change cold accumulation box in a partial load cold accumulation state;
(3) When (when)When in use; the evaporator fully bears the indoor cold load, so that the phase change cold accumulation box is in a cold insulation state;
(4) When (when)When in use; the evaporator and the phase change cold accumulation equipment jointly bear indoor cold load;
(5) When (when)When in use; the phase change cold storage equipment fully bears indoor cold load.
In some embodiments of the disclosure, the small direct expansion phase change cold storage air conditioner comprises a double-suction port compressor, a condenser and a matched fan thereof, which are connected with an air outlet of the double-suction port compressor, an evaporator and a matched fan thereof, which are connected with an air inlet of the double-suction port compressor, and the phase change cold storage equipment; the phase-change cold accumulation equipment comprises a phase-change cold accumulation box, a phase-change material arranged in the phase-change cold accumulation box, a refrigerant pipeline arranged in the phase-change cold accumulation box, a surface cooler, a matched fan and a water pipeline arranged in the phase-change cold accumulation box and the surface cooler.
In some embodiments of the present disclosure, the evaporator is connected with an evaporator solenoid valve and an evaporator electronic expansion valve.
In some embodiments of the present disclosure, the phase change cold storage device is connected with a phase change cold storage device solenoid valve and a phase change cold storage device electronic expansion valve.
In some embodiments of the present disclosure, the water line is provided with a water line solenoid valve and a water line water pump.
In some embodiments of the disclosure, the condenser and the double suction compressor are located outdoors.
In some embodiments of the disclosure, the phase change cold storage box, the surface cooler and its associated blower, the evaporator and its associated blower are located indoors.
In some embodiments of the present disclosure, the surface cooler mating fan and the evaporator mating fan are both provided with air outlets.
In some embodiments of the present disclosure, the phase change material is latent heat of phase change C PCM 220kJ/kg, and the phase transition temperature is 5 ℃.
In some embodiments of the present disclosure, the dual suction port compressor is turned on when the phase change cold storage box is full load cold storage; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is opened; the electronic expansion valve of the phase change cold accumulation equipment is fully opened; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed.
In some embodiments of the present disclosure, the instant double suction port compressor is turned on when the phase change cold storage tank is in a part load cold storage state; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is opened; the electronic expansion valve of the phase change cold accumulation equipment is partially opened; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed.
In some embodiments of the present disclosure, the compressor is turned on when the phase change cold storage box is in a cold maintaining state; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed.
In some embodiments of the present disclosure, the dual suction port compressor is turned on when the phase change cold storage device is taking part of the indoor cold load; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the evaporator electronic expansion valve is partially opened; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve, the surface cooler matched fan and the water pipeline water pump are opened in a linkage way.
In some embodiments of the present disclosure, the dual suction port compressor is turned off when the phase change cold storage device fully bears an indoor cold load; the condenser matched fan is closed; the evaporator matched fan is closed; the evaporator electromagnetic valve is closed; the evaporator electronic expansion valve is partially closed; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve, the surface cooler matched fan and the water pipeline water pump are opened in a linkage way.
One or more technical solutions provided in the embodiments of the present application at least have any one of the following technical effects or advantages:
1. by selecting the phase change material with the same evaporation temperature as the air conditioner, the original refrigerator is utilized to charge the phase change material for cooling while the latent heat of the material is stored, and the advantages of ice storage and water storage are considered, and the volume of the material is not additionally increased.
2. The phase change cold storage equipment is additionally arranged to improve the electricity utilization flexibility level of the existing small-sized direct expansion air conditioner, increase the capacity of the air conditioner for coping with renewable energy power generation fluctuation, improve the absorption rate of the renewable energy power generation of the air conditioner, reduce the dependence on fossil energy power generation, and realize energy conservation and emission reduction in the operation stage of the direct expansion air conditioner.
3. By adopting different regulation and control methods under 5 power supply states, the power supply and the power consumption requirements of users are compared, fluctuation of renewable energy power supply is dealt with, the cooling stability of the air conditioner in summer is improved through flexible regulation and control, and the cooling requirements of the users are met.
Drawings
Fig. 1 is a schematic diagram of a small and medium-sized direct expansion type phase change cold storage air conditioning system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a phase change cold storage device according to an embodiment of the present application.
Fig. 3 is a top view of the phase change regenerator of fig. 2.
Fig. 4 is a left side view of the phase change cold box of fig. 2.
Fig. 5 is a front view of an indoor unit of a small-sized direct expansion type phase change cold storage air conditioning system according to an embodiment of the present application.
Fig. 6 is a side view of a small and medium sized direct expansion type phase change cold storage air conditioning system according to an embodiment of the present application.
Fig. 7 shows the change of the index of the cooling load per unit area of the building in an embodiment of the present application.
Fig. 8 is a graph showing local solar irradiation intensity variation in a cooling season in an embodiment of the present application.
In the above figures; 1. a double suction port compressor; 2. a condenser; 2-1, a second pipeline; 2-2, a fan matched with the condenser; 3. an evaporator; 3-1, a third pipeline; 3-2, a third pipeline electromagnetic valve; 3-3, a third pipeline electronic expansion valve; 3-4, matching a fan with the evaporator; 4. a phase change cold storage device; 4-1, a fourth pipeline; 4-2, a fourth pipeline electromagnetic valve; 4-3, a fourth pipeline electronic expansion valve; 4-3, an electronic expansion valve of a phase change cold accumulation device pipeline; 4-4, a phase change cold storage box; 4-5, phase change material consistent with the evaporating temperature of the refrigerant; 4-6, a water pipeline; 4-7, a water pipeline electromagnetic valve; 4-8, a surface air cooler fan; 4-9, a surface cooler; 4-10, a water pipeline water pump; 5. and an air outlet of the indoor unit.
Detailed Description
The present application, as it relates to "first," "second," "third," etc., is used to distinguish similar objects from each other and does not limit a particular order or sequence.
The unit modules (parts, pipe valve members, structures, mechanisms) or sensors and other devices according to the following embodiments are all conventional commercial products unless otherwise specified.
The embodiment of the application solves the problem that the cooling requirement of the air conditioner in summer of a user cannot be met under the fluctuation of power supply of renewable energy sources in the prior art by providing the small direct expansion type phase change cold storage air conditioning system.
In order to solve the problem of crosstalk, the technical solution in the embodiment of the present application is as follows:
different regulation and control methods under 5 power supply states are provided through the model selection of the small direct expansion type phase change cold storage air conditioning system, and the cooling requirement of the air conditioner in summer of a user is met.
For better understanding of the technical solutions of the present application, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The embodiment discloses a small-sized direct expansion type phase change cold accumulation air conditioning system, referring to fig. 1 to 4, which comprises a main pipeline provided with a double-suction port compressor 1, a second pipeline 2-1 provided with a condenser 2 and a matched fan thereof, a third pipeline 3-1 provided with an evaporator 3 and a matched fan 3-4 thereof, and a fourth pipeline 4-1 provided with phase change cold accumulation equipment 4; the main pipeline is connected with the second pipeline 2-1 through an air outlet of the double-air-suction-port compressor 1 and is respectively connected with the third pipeline 3-1 and the fourth pipeline 4-1 through two air suction ports; the phase-change cold accumulation device 4 on the fourth pipeline 4-1 comprises a phase-change cold accumulation box 4-4, phase-change materials arranged in the phase-change cold accumulation box 4-4, a refrigerant pipeline arranged in the phase-change cold accumulation box 4-4, a surface cooler 4-9 and a matched fan 4-8 thereof, and a closed water pipeline arranged in the phase-change cold accumulation box 4-4 and the surface cooler 4-9. The third pipeline 3-1 is connected with a third pipeline electromagnetic valve 3-2 and a third pipeline electronic expansion valve 3-3, the electromagnetic valve controls the on-off of the third pipeline 3-1, and the third pipeline electronic expansion valve 3-3 controls the refrigerant flow of the third pipeline 3-1. The fourth pipeline 4-1 is connected with a fourth pipeline electromagnetic valve 4-2 and a fourth pipeline electronic expansion valve 4-3, the fourth pipeline electromagnetic valve 4-2 controls the on-off of the fourth pipeline 4-1, and the fourth pipeline electronic expansion valve 4-3 controls the flow of the refrigerant of the fourth pipeline 4-1. The water pipeline 4-6 is connected with a water pipeline electromagnetic valve 4-7 and a water pipeline water pump 4-10, and the water pipeline electromagnetic valve 4-7 controls the on-off of the water pipeline 4-6 to realize the start and stop control of the surface air cooler fan 4-8 and the water pipeline water pump 4-10.
Referring to fig. 5 and 6, the small direct expansion phase change cold storage air conditioning system comprises an indoor unit and an outdoor unit formed by a condenser 2, wherein the indoor unit comprises a double-suction port compressor 1 connected with the condenser 2, and a phase change cold storage box 4-4, a surface cooler 4-9, a surface cooler fan 4-8, an evaporator 3 and an evaporator fan 3-4 connected with the double-suction port compressor 1 are arranged on the double-suction port compressor 1. The surface cooler matched fan 4-8 and the evaporator matched fan 3-4 are connected with an indoor unit air outlet 5.
Example two
The embodiment discloses a model selection calculation method of a small-sized direct expansion type phase change cold accumulation air conditioning system, which comprises the following steps:
taking a common 3-piece household cabinet air conditioner as an example, the rated refrigerating capacity is 7210W, and the rated refrigerating power is 2000W. Therefore, the electric power required to be consumed for the production of 7210W is 2000W.
If the rated refrigerating capacity is kept unchanged, the refrigerating capacity of the small-sized direct expansion phase change cold storage air conditioning system is 7210W.
Different from the situation that large-scale cold storage equipment should be powered off for a long time, the invention mainly aims to improve the real-time power utilization flexibility of a small-scale direct expansion air conditioning system, so that 15 minutes is taken as the most unfavorable working condition for carrying out the selection calculation by taking the time of severely insufficient power supply quantity.
(1) Selecting a phase change cold accumulation box:
the phase-change material uses the phase-change latent heat C PCM The paraffin inorganic salt phase-change material with the phase-change temperature of not less than 220kJ/kg, such as '5-degree phase-change material' of Sichuan Ai Shipa New Material science and technology Co., ltd, the phase-change temperature of which is close to the evaporation temperature of the refrigerant, is the phase-change material in the calculation example, and the mass of the phase-change material required for continuously cooling for 15 minutes is 29kg. Taking the volume occupied by a refrigerant pipeline and a water loop in the phase-change cold storage box and the condition that the phase-change material cannot fully store and release cold into consideration, taking the amplification factor of 1.2 to obtain the volume of the phase-change cold storage box of 0.04m 3 。
The detailed calculation process is as follows:
。
(2) Surface cooler and matched fan selection:
the power supply is seriously insufficient in the calculation example, and the selection is needed to be carried out by completely relying on the extreme working condition of the phase change cold storage equipment for cooling, so that the rated cooling capacity of the selected surface cooler is larger than or equal to 7210W. The rated cooling capacity of the selected fan coil with the corresponding model of FP-136 of the surface cooler and the matched fan is 7380kW, and the input power of the matched fan under the maximum air quantity is 174W.
(3) Selecting a water pump:
the water resistance of the surface cooler coil was 15kPa and the flow was 1278kg/h. The resistance of the connecting pipeline of the surface cooler and the water coil in the phase change box is calculated by a conventional flow resistance calculation method. According to 5.8.3 of national civil construction engineering design technical measures, the specific friction of a cold water system is required to be controlled in a reasonable range of 100-300pa/m, and the specific friction is calculated according to the following formula:
；
according to a specific friction formula and a specific friction requirement range, the range of the pipe diameter of the pipeline is deduced, DN15 is selected as the main pipe size, the specific friction is 214pa/m, the technical requirement is met, and the length of the water pipe is not more than 1m at maximum; the equivalent length of 4 elbows is 2m; valve loss 5.5m; the total loss was 1.819kPa.
The water coils in the phase-change water tank are connected in parallel in a multi-channel waterway, the calculation is carried out according to the resistance of the parallel pipelines, 3 branch pipelines are selected, the specific friction is 201pa/m, the technical requirements are met, and the length of a single pipeline is 5m; the equivalent length of the 180-degree elbow of the 3-branch pipe is 0.8m according to 11 calculation, and the total equivalent length is 8.8m; the equivalent length of the tee joint of the parallel pipeline is 2m; the total loss was 3.175kPa.
The overall water resistance of the water loop is 19.994kPa.
The water pump power consumption calculation formula is that the design pressure head and the design flow rate are usually selected according to 80% of the nameplate value.
。
It should be noted that, on the one hand, the terminal in the actual operation of the air conditioning system is not in a continuous cooling state, that is, when the indoor temperature reaches the user set temperature, the terminal of the air conditioner stops cooling, so the actual cooling time of the phase change cold storage box selected by continuously cooling for 15 minutes is obviously longer than 15 minutes. On the other hand, the model selection calculation is based on the extreme working condition of completely cooling by the cold storage water tank, so that the sizes of the supplementary cooling device, the cold storage water tank, the surface cooler, the fan, the water pump and the corresponding key size are obviously reduced if the cold storage water tank, the surface cooler, the fan and the water pump are used as the supplementary cooling device when the power supply is insufficient.
Example three
The embodiment discloses a power consumption effect analysis of small-size direct expansion phase transition cold-storage air conditioning system, includes:
the rated refrigerating capacity of the common 3-piece household cabinet air conditioner is 7210W, the rated refrigerating power is 2000W, and the energy efficiency ratio is that:
；
the equipment is used for analysis, the power consumption of the double-suction port compressor accounts for 90% of the total refrigeration power, namely:
。
the energy consumption equipment power of the phase change cold storage equipment is 174W, the power consumption of a surface cooler and a matched fan is 13.8W, the total power consumption of a water pump is 188W, and frequency conversion equipment is selected. The power consumption of the phase change cold storage device when providing different percent of refrigerating capacity is shown in the following table, wherein the refrigerating capacity is calculated according to rated 7210W, and the refrigerating power consumption of the compressor when 100 percent is calculated according to rated 2000W in comparison.
TABLE 1 calculation of the Power consumption adjustment Effect of the invention
。
Example four
The embodiment discloses a carbon emission calculation method of a small-sized direct expansion type phase change cold accumulation air conditioning system, which comprises the following steps:
(1) Calculation basis
According to the 4.1.4 th item of the building carbon emission calculation standard GB/T51366-2019 (hereinafter referred to as the standard), the carbon emission of the system and the conventional air conditioner corresponding to the refrigerating capacity are compared and analyzed, so that the advantage of the system in the aspect of reducing the running carbon emission is obtained; the calculation formula adopted is as follows:
；
wherein:
C M carbon emission per building area (kgCO) during the building operation phase 2 /m 2 ）；
E i Building annual energy consumption (units/a) of class i;
EF i carbon emission factor of energy sources of class i;
E i,j class i energy consumption (units/a) of a class j system;
ER i,j class j systems i energy (units/a) provided by the renewable energy system;
i-building consumption terminal energy types including electric power, fuel gas, petroleum, municipal heating power and the like;
j-type of building energy system, including heating and air conditioning, lighting, domestic hot water system, etc.;
C p annual carbon reduction (kgCO) of building green land carbon sink system 2 /a）；
y-architectural design life (a);
a-building area (m) 2 ）。
(2) Exemplary case calculation
The 3-piece cabinet air conditioner is used as a calculation object and applied to an office of a small office building in Zhengzhou area to carry out carbon emission calculation.
The unit area cold load index of the small office building during the air conditioning refrigeration period is obtained by using the building Energy consumption simulation software Energy Plus simulation, as shown in fig. 7, wherein the area index is 115.52W at the highest. Therefore, the cooling area of the air conditioner with the rated cooling capacity of 7210W is 60m 2 . The operating carbon emissions of the plant were calculated according to the above parameters.
The annual electricity consumption of air conditioning equipment refrigeration is:
。
the carbon emission factor of the national power grid supply released in 2022 is 0.5810tCO2/MWh, and if the air conditioning equipment uses the power grid power entirely, the total carbon emission of the unit cooling area of the air conditioning equipment in the service life of the building is as follows:
。
referring to fig. 7 and 8, comparing the changes in local solar irradiation intensity in the cooling season as in fig. 8 and the changes in the index of the cooling load per unit area of the building as in fig. 7, a significant difference in time sequence exists between the two. If no flexible electricity utilization measures are adopted, only the synchronous part of photovoltaic power generation and air conditioner electricity utilization can be utilized. The air conditioner can utilize photovoltaic power generation to generate electricity as follows: in each time step, if the photovoltaic power generation amount is smaller than or equal to the power consumption amount, the photovoltaic power generation is fully utilized; if the photovoltaic power generation amount is larger than the power consumption amount, only a part of the power consumption amount can be utilized, and the abundant power generation cannot be stored. Namely:
；
the annual cumulative amount of the photovoltaic power generation which can be utilized is 366.66kWh/a, and the carbon emission factor of the photovoltaic power generation is 0.0033tCO 2 /MWh. The total electricity consumption is 642.71kWh/a, and the part which cannot utilize the photovoltaic power generation still needs the power grid for power supply.
Consider the carbon emissions during the full life cycle of a building for an air conditioning system that consumes photovoltaic but does not use electrically flexible conditioning components as follows:
。
if the phase change cold accumulation equipment is adopted as flexible electricity utilization regulation equipment, the air conditioner can run by totally depending on photovoltaic power generation under ideal regulation. The carbon emissions of the air conditioner containing the flexible electricity consumption component in the whole life cycle of the building are as follows:
。
table 2 comparison of carbon emissions for different air conditioner runs
。
Example five
The embodiment discloses a regulation and control method of a small-sized direct expansion type phase change cold accumulation air conditioning system, which comprises the following steps:
with P Power supply The unit is kW for supplying power; q (Q) User' s The unit is kW for the user's cooling load; q (Q) Cold storage box Cold load of cold accumulation tank for cold accumulation, Q Cold storage box max The maximum cold accumulation load is shown as kW; COP is the energy efficiency ratio of the system, i.e. the ratio of the cooling capacity to the power supply capacity;
(1) When (when)The power supply is larger than or equal to the total power consumption requirement of the user cold load and the full-load cold accumulation of the phase-change cold accumulation box; the indoor cold load is completely borne by the evaporator, and the phase change cold accumulation box is in a full-load cold accumulation state; the double-suction port compressor 1 is started and runs at full load; the fan 2-2 is started and is regulated according to the cooling load of a user and the running state of the evaporator 3; the evaporator matched fan 3-4 is started, and the air speed and the user cooling load are adjusted according to the user setting; the third pipeline electromagnetic valve 3-2 is opened; the third pipeline electronic expansion valve 3-3 is fully opened; the fourth pipeline electromagnetic valve 4-2 is opened; the fourth pipeline electronic expansion valve 4-3 is fully opened; the water pipeline electromagnetic valve 4-7 is closed; the surface cooler fan 4-8 is turned off; the water line pump 4-10 is turned off.
(2) When (when)The power supply is smaller than the total power consumption requirement of full-load cold accumulation of a user cold load plus phase change cold accumulation box, but still larger than the user cold load; the indoor cold load is completely borne by the evaporator, and the phase change cold accumulation box is in a partial load cold accumulation state; the double-suction port compressor 1 is started, partial load operation is performed, and the evaporator load is added with the cold storage load of the cold storage water tank; the matched fan 2-2 of the condenser is started, and the operation state of the evaporator 3 is adjusted according to the cooling load of a user; the evaporator matched fan 3-4 is started, and the air speed and the user cooling load are adjusted according to the user setting; the third pipeline electromagnetic valve 3-2 is opened; the third pipeline electronic expansion valve 3-3 is fully opened; the fourth pipeline electromagnetic valve 4-2 is opened; the fourth pipeline electronic expansion valve 4-3 is partially opened; the water pipeline electromagnetic valve 4-7 is closed; the surface cooler fan 4-8 is turned off; the water line pump 4-10 is turned off.
(3) When (when)I.e. the power supply is equal to the power demand of the user's cooling load; the indoor cold load is completely borne by the evaporator, and the phase change cold accumulation box is in a cold insulation state; the compressor 1 is started, and the partial load is operated, so that the requirements of the evaporator are met; the matched fan 2-2 of the condenser is started, and the operation state of the evaporator 3 is adjusted according to the cooling load of a user; the evaporator matched fan 3-4 is started, and the air speed and the user cooling load are adjusted according to the user setting; the third pipeline electromagnetic valve 3-2 is opened; the third pipeline electronic expansion valve 3-3 is fully opened; the fourth pipeline electromagnetic valve 4-2 is closed; the fourth pipeline electronic expansion valve 4-3 is closed; the water pipeline electromagnetic valve 4-7 is closed; the surface cooler fan 4-8 is turned off; the water line pump 4-10 is turned off.
(4) When (when)I.e. the power supply is less than the power demand of the user's cooling load; the indoor cold load is jointly born by the evaporator and the phase change cold accumulation equipment; the double-suction port compressor 1 is started, and partial load operation is performed, so that only partial load of the evaporator is met; the condenser matched fan 2-2 is started and regulated according to the running state of the evaporator 3; the evaporator matched fan 3-4 is started; the third pipeline electromagnetic valve 3-2 is opened; the third pipeline electronic expansion valve 3-3 is partially opened; the fourth pipeline electromagnetic valve 4-2 is closed; the fourth pipeline electronic expansion valve 4-3 is closed; the electromagnetic valve 4-7 of the water pipeline, the fan 4-8 of the surface air cooler and the water pump 4-10 are opened in a linkage way, and the fan 4-8 of the surface air cooler and the water pump 4-10 of the water pipeline are regulated so that the cooling of the surface air cooler is equal to the difference value between the total cooling demand of a user and the cooling of the evaporator 3.
(5) When (when)I.e. the power supply is tensioned; the phase change cold accumulation equipment fully bears indoor cold load; the double-suction port compressor 1 is closed; the condenser matched fan 2-2 is closed; the evaporator matched fan 3-4 is closed; the third pipeline electromagnetic valve 3-2 is closed; the third pipeline electronic expansion valve 3-3 is partially closed; fourth stepThe pipeline electromagnetic valve 4-2 is closed; the fourth pipeline electronic expansion valve 4-3 is closed; the electromagnetic valve 4-7 of the water pipeline, the fan 4-8 of the surface air cooler and the water pump 4-10 are opened in a linkage way, and the fan 4-8 of the surface air cooler and the water pump 4-10 of the water pipeline are regulated so that the cooling of the surface air cooler is equal to the total cooling capacity requirement of a user.
While certain preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, the present invention is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (3)
1. The regulation and control method of the small-sized direct expansion type phase change cold accumulation air conditioner is characterized in that the small-sized direct expansion type phase change cold accumulation air conditioner comprises phase change cold accumulation equipment, and the phase change cold accumulation equipment comprises a phase change cold accumulation box; the small direct expansion type phase change cold storage air conditioner comprises a double-air-suction-port compressor, a condenser connected to an air outlet of the double-air-suction-port compressor and a matched fan thereof, an evaporator connected to an air inlet of the double-air-suction-port compressor and a matched fan thereof, and the phase change cold storage equipment; the phase-change cold accumulation equipment comprises a phase-change cold accumulation box, a phase-change material arranged in the phase-change cold accumulation box, a refrigerant pipeline arranged in the phase-change cold accumulation box, a surface cooler, a matched fan and a water pipeline arranged in the phase-change cold accumulation box and the surface cooler; the evaporator is connected with an evaporator electromagnetic valve and an evaporator electronic expansion valve; the phase-change cold accumulation equipment is connected with a phase-change cold accumulation equipment electromagnetic valve and an electronic expansion valve of the phase-change cold accumulation equipment; the water pipeline is provided with a water pipeline electromagnetic valve and a water pipeline water pump;
based on the fluctuation rule of power supply, the following regulation and control method is adopted:
with P Power supply Represents the power supply, Q User' s Representing a user cooling load; q (Q) Cold storage box Represents the cold load of cold accumulation of the cold accumulation box, Q Cold storage box max Representing a maximum cold storage load; COP represents the energy efficiency ratio of the system, i.e. the ratio of the cooling capacity to the power supply capacity;
(1) When (when)When in use; the double-suction port compressor is started; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is opened; the electronic expansion valve of the phase change cold accumulation equipment is fully opened; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed; the phase change cold accumulation device is in full-load cold accumulation;
(2) When (when)When in use; the double-suction port compressor is started; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is opened; the electronic expansion valve of the phase change cold accumulation equipment is partially opened; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed; the phase change cold accumulation device is in a partial load cold accumulation state;
(3) When (when)When in use; the compressor is started; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the electronic expansion valve of the evaporator is fully opened; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve is closed; the surface cooler matched fan is closed; the water pipeline water pump is closed; the phase change cold accumulation device is in a cold insulation state;
(4) When (when)When in use; the double-suction port compressor is started; the condenser is opened by a fan matched with the condenser; the evaporator is opened by a fan matched with the evaporator; the evaporator electromagnetic valve is opened; the evaporator electronic expansion valve is partially opened; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve, the surface cooler matched fan and the water pipeline water pump are opened in a linkage way; the phase change cold accumulation equipment bears part of indoor cold load;
(5) When (when)When in use; the double-suction port compressor is closed; the condenser matched fan is closed; the evaporator matched fan is closed; the evaporator electromagnetic valve is closed; the evaporator electronic expansion valve is partially closed; the electromagnetic valve of the phase change cold accumulation equipment is closed; the electronic expansion valve of the phase change cold accumulation equipment is closed; the water pipeline electromagnetic valve, the surface cooler matched fan and the water pipeline water pump are opened in a linkage way; the phase change cold storage device fully bears indoor cold load.
2. The method for controlling a small direct expansion type phase change cold storage air conditioner according to claim 1, wherein the condenser and the double-suction port compressor are arranged outdoors, and the phase change cold storage box, the surface cooler and a matched fan thereof, and the evaporator and a matched fan thereof are arranged indoors; and the surface cooler matched fan and the evaporator matched fan are both provided with air outlets.
3. The method for controlling a small-sized direct expansion type phase change cold storage air conditioner according to claim 1, wherein the phase change material is phase change latent heat C PCM 220kJ/kg, and the phase transition temperature is 5 ℃.
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