JP5921777B1 - Refrigeration cycle equipment - Google Patents

Abstract

A refrigeration cycle having a compressor 1, a multi-pass condenser 2 having a condenser body 21 having a plurality of refrigerant paths, an expansion valve 3, and an evaporator 4, in which refrigerant circulates, and a compressor The exhaust heat exchanger 5 that recovers heat from the refrigerant discharged from 1 to heat the heat exchange medium, and an equal distribution means that evenly distributes the refrigerant to the plurality of refrigerant paths of the condenser body 21 are provided. .

Description

  The present invention relates to a refrigeration cycle apparatus used for applications such as refrigeration, air conditioning, and hot water supply.

  Conventionally, as a waste heat utilization system of a refrigeration cycle apparatus such as a refrigerator and an air conditioner, as shown in Patent Document 1, a refrigerator connected to a showcase installed in a store and the waste heat of the refrigerator There is a thing provided with a hot water supply device that supplies hot water into the store using the. In this exhaust heat utilization system, exhaust heat is recovered from the high-temperature and high-pressure discharge gas refrigerant that is discharged from the compressor of the refrigerator and before flowing into the condenser.

JP 2009-293839 A (summary, FIG. 2)

  A condenser of a general refrigeration cycle apparatus includes a header that distributes the refrigerant flowing into the condenser body. When the refrigerant flowing into the header is in a gas phase, the condenser is evenly distributed by the header. It can be made to flow into each refrigerant path of the main body. However, if the discharged gas refrigerant discharged from the compressor is recovered and condensed before it flows into the condenser and becomes a gas-liquid two-phase, it cannot be evenly distributed in the header, causing the performance of the refrigerator to deteriorate. there is a possibility.

  The present invention has been made in view of such points, and even when exhaust heat is recovered from the discharged gas refrigerant, the refrigerant distribution to the refrigerant paths of the condenser is always equalized, and high performance is avoided by avoiding performance degradation. It aims at obtaining the refrigerating cycle device which can obtain.

A refrigeration cycle apparatus according to the present invention includes a compressor, a multi-pass type air-cooled condenser having a condenser body having a plurality of refrigerant paths, a decompression unit, and an evaporator, and the refrigerant circulates. A heat exchanger that heats the heat exchange medium by exchanging heat between a refrigeration cycle that is performed and a pipe through which a refrigerant discharged from the compressor passes and a pipe through which a heat exchange medium different from the condenser passes. And an equal distribution means for evenly distributing the refrigerant to the plurality of refrigerant paths of the condenser body , wherein the equal distribution means bypasses the condenser and has a first bypass circuit in which a heat exchanger is disposed, and a first bypass A second bypass circuit that connects a refrigerant outlet of the heat exchanger in the circuit and a refrigerant inlet of the condenser in the refrigeration cycle, and is discharged from the compressor if the temperature of the heat exchange medium is lower than the refrigerant condensation temperature. One of the refrigerants going to the condenser If the temperature of the heat exchange medium is equal to or higher than the condensation temperature of the refrigerant, the refrigerant discharged from the compressor is caused to flow into the first bypass circuit to exchange heat. After passing through the condenser, it is caused to flow into the condenser from the second bypass circuit .

  According to the present invention, it is possible to obtain a high energy saving effect while avoiding performance degradation.

It is a figure showing the structure of the refrigerating-cycle apparatus in Embodiment 1 of this invention. It is the figure which showed the divider | distributor in the condenser of the refrigerating-cycle apparatus in Embodiment 1 of this invention. It is a figure showing the structure by which the 1st equal distribution means was installed in the refrigeration cycle apparatus in Embodiment 1 of this invention. It is a figure showing the structure provided with the 6th equal distribution means in the refrigerating-cycle apparatus in Embodiment 1 of this invention. It is operation | movement explanatory drawing of each switching valve of FIG. 4 according to the relationship between the water temperature of the water which flows in into the exhaust heat exchanger of FIG. 4, and a condensation temperature. It is the figure which showed the other structural example of the divider | distributor in the condenser of the refrigerating-cycle apparatus in Embodiment 1 of this invention. It is a figure showing the structure of the refrigerating-cycle apparatus in Embodiment 2 of this invention.

Embodiment 1 FIG.
First, Embodiment 1 of the present invention will be described. This Embodiment 1 is an exhaust heat exchanger for using the heat of the discharge gas refrigerant in the middle of the refrigerant pipe that conveys the high-temperature and high-pressure discharge gas refrigerant discharged from the compressor of the refrigeration cycle apparatus to the condenser. Is provided. Then, water for producing hot water stored in the water storage tank is circulated in the exhaust heat heat exchanger to exchange heat between the exhaust heat gas refrigerant and water.

  Moreover, in this Embodiment 1, the water warmed with the exhaust heat exchanger is introduce | transduced into a water storage tank, and it heats, but when the water temperature in a water storage tank has not reached preset temperature, it installed in the water storage tank The water in the water storage tank is further heated with an electric heater to a set temperature. As a result, the heater heating amount can be significantly reduced as compared with the case of using no exhaust heat, and a high energy saving effect can be obtained. Further, the capacity of the electric heater can be reduced, and the cost can be reduced.

  Furthermore, by setting it as the said structure, since a discharge gas refrigerant | coolant is cooled with water with a waste heat exchanger, a condensation temperature falls. Therefore, since the compression ratio is lowered, the compressor input is reduced, and the energy saving effect of the refrigerator itself can be obtained. Or, when the condenser is air-cooled, the condensation temperature is lowered by cooling with the exhaust heat exchanger, so the rotation speed of the condenser blower can be reduced, energy saving effect can be obtained, and the operating noise of the blower can be reduced It becomes. Therefore, the system of the first embodiment is particularly effective when used for a store such as a convenience store where houses are densely packed.

  Hereinafter, a preferred embodiment of a refrigeration apparatus according to the present invention will be described with reference to the drawings. In FIG. 1 and the drawings to be described later, the same reference numerals denote the same or corresponding parts, which are common throughout the entire specification. Furthermore, the form of the constituent elements appearing in the whole specification is merely an example, and is not limited to these descriptions.

FIG. 1 is a diagram illustrating a configuration of a refrigeration cycle apparatus according to Embodiment 1 of the present invention.
The refrigeration cycle apparatus in Embodiment 1 includes a refrigerator 100 and a water heater 101 for supplying hot water to a sink or the like as a hot water supply system separately from the refrigerator 100.

  A compressor 1 and a condenser 2 are installed in the refrigerator 100 shown in FIG. 1, and an expansion valve 3 and an evaporator 4 as decompression means are installed in a showcase 102 in a store such as a convenience store. ing. The refrigerator 100 and the showcase 102 are connected by a refrigerant pipe 11 and constitute a refrigeration cycle in which the refrigerant circulates through the compressor 1, the condenser 2, the expansion valve 3 and the evaporator 4. In addition, an exhaust heat exchanger 5 is installed between the compressor 1 and the condenser 2, and the high-temperature and high-pressure discharged gas refrigerant discharged from the compressor 1 is exhausted through the refrigerant pipe 11. Then, the refrigerant flows into the condenser 2 in the refrigerator 100.

  Further, water as a heat exchange medium is guided to the exhaust heat exchanger 5 from the water storage tank 6 of the water heater 101 through the water pipe 12. A water circulation pump 7 is provided in the water pipe 12, and a water circulation pipe 12 constitutes a circulation path for flowing water from the water storage tank 6 to the exhaust heat exchanger 5 and then returning it to the water storage tank 6. The water guided to the exhaust heat exchanger 5 is returned to the water storage tank 6 after exchanging heat with the discharge gas refrigerant guided through the refrigerant pipe 11.

  In the first embodiment, a water supply pipe (not shown) is connected to the water pipe 12 on the suction side of the water circulation pump 7 so that water from the water supply is supplied to the water pipe 12 through the water supply pipe. It has become. An electric heater 8 is installed in the water storage tank 6 to heat the water in the water storage tank 6 (referred to as water for convenience, including heated hot water). The electric heater 8 is controlled so as to heat the water in the water storage tank 6 when the temperature is lower than the temperature.

  The condenser 2 is a multi-pass heat exchanger having a plurality of refrigerant paths, and is disposed on the condenser main body 21 and the refrigerant inlet side of the condenser main body 21 to distribute the refrigerant to each refrigerant path. And a container 22.

FIG. 2 is a diagram showing a distributor in the condenser of the refrigeration cycle apparatus according to Embodiment 1 of the present invention.
The distributor 22 is a header, and includes a main pipe 22a, an inlet pipe 22b having one end connected to the main pipe 22a, a plurality of ends connected to the refrigerant pipes of the condenser main body 21, and one end connected to the main pipe 22a. The branch pipe 22c is provided.

  The high-temperature and high-pressure discharged gas refrigerant compressed by the compressor 1 in the refrigeration cycle apparatus configured as described above is introduced into the exhaust heat exchanger 5 via the refrigerant pipe 11 for use of exhaust heat. The discharged gas refrigerant introduced into the exhaust heat exchanger 5 is cooled by exchanging heat with water introduced into the exhaust heat exchanger 5 from the water storage tank 6 of the water heater 101 by the water circulation pump 7. On the other hand, water flowing into the exhaust heat exchanger 5 is heated by heat exchange with the discharge gas refrigerant, and the heated water returns to the water storage tank 6 through the water pipe 12.

In addition, the hot water use manufactured by this Embodiment 1 can also be utilized for floor heating, road heating, etc. besides hot water supply. Therefore, the heat exchange medium may be a fluid such as brine, an HFC refrigerant, an HFO refrigerant, an HC refrigerant, CO ₂ , ammonia, air, etc. in addition to water.

  The refrigeration cycle apparatus further includes a control unit 110 that controls the entire refrigeration cycle apparatus. The control unit 110 is constituted by a microcomputer having control arithmetic processing means such as a CPU. In addition, the control unit 110 has storage means (not shown), and has data in which a processing procedure related to control and the like is a program. Then, the control arithmetic processing means executes processing based on the program data to realize control.

  In this Embodiment 1, it is set as the structure which heats the water of the water storage tank 6 using the exhaust heat of the discharge gas refrigerant | coolant from the compressor 1. FIG. For this reason, the amount of heat exchange in the condenser 2 can be reduced, the condensation temperature can be lowered, that is, the compression ratio can be lowered, and the input of the compressor 1 can be reduced. As described above, according to the first embodiment, by reducing the operation compression ratio of the refrigerator 100, the power consumption is reduced and an energy saving effect is obtained.

  The rotational speed control of the blower 9 for the condenser 2 is generally performed based on a high pressure or a condensation temperature. In the first embodiment, the refrigerant flowing into the condenser 2 is cooled by water from the water storage tank 6 in the exhaust heat exchanger 5 and the temperature is lowered. For this reason, the amount of heat exchange in the condenser 2 is reduced. As a result, the rotational speed of the blower 9 when using exhaust heat according to the first embodiment can be controlled to be lower by the amount of heat exchange.

  As described above, according to the first embodiment, when the air-cooled condenser 2 is used, it is possible to reduce the operating noise of the blower 9, and when it is used in a convenience store such as a densely populated house, There is an effect that can provide a system with special consideration.

  However, in the condenser 2 of the general refrigerator 100, when the refrigerant at the inlet of the condenser 2, that is, the refrigerant flowing into the distributor 22 is condensed into a gas-liquid two-phase as a result of exhaust heat recovery, The liquid component flowing into each refrigerant path of the condenser main body 21 cannot be evenly distributed, and the performance of the refrigerator 100 may be reduced. Therefore, the refrigeration cycle apparatus of the first embodiment has an equal distribution means that evenly distributes the refrigerant to each refrigerant path of the condenser main body 21 even when exhaust heat is recovered from the discharged gas refrigerant, thereby reducing performance. It is configured to avoid it reliably. Hereinafter, eight specific configurations as the equal distribution means will be described. In addition, the equal distribution means is roughly divided into two types, and the refrigerant state at the condenser 2 inlet (exhaust heat exchanger 5 outlet) is changed to a gas single phase (that is, gas-liquid two-phase). Gas single-phase distribution type that distributes evenly, and gas-liquid two-phase distribution type that distributes even when the condenser 2 inlet (exhaust heat exchanger 5 outlet) is gas-liquid two-phase And have.

[Gas single phase distribution type]
There are six types of gas single-phase distribution type equal distribution means. This will be described in order below.

(First equal distribution means)
The first uniform distribution means is composed of a gas-liquid separator 13. Details will be described below.

FIG. 3 is a diagram showing a configuration in which the first equal distribution means is installed in the refrigeration cycle apparatus according to Embodiment 1 of the present invention.
The gas-liquid separator 13 is installed at the inlet of the condenser 2 and separates the gas-liquid two-phase refrigerant flowing out of the exhaust heat exchanger 5 into liquid refrigerant and gas refrigerant. Therefore, even if the refrigerant at the inlet of the condenser 2 is gas-liquid two-phase, the gas-liquid two-phase refrigerant is allowed to pass through the gas-liquid separator 13 before flowing into the distributor 22, and the gas single-phase refrigerant is passed through the condenser 2. It becomes possible to flow into the distributor 22. Therefore, the refrigerant can be evenly distributed to each refrigerant path of the condenser body 21 using the header as the distributor 22 as in the conventional case. The liquid refrigerant separated by the gas-liquid separator 13 is combined with the liquid refrigerant at the outlet of the condenser 2 through the pipe 13a.

(Second equal distribution means)
The second equal distribution means is configured by means for controlling the capacity of the compressor 1 so that the refrigerant state of the outlet refrigerant of the exhaust heat exchanger 5 becomes a gas single phase. Details will be described below.

  When the degree of superheat of the outlet refrigerant of the exhaust heat exchanger 5 is small, the control unit 110 increases the number of rotations of the compressor to increase the degree of superheat, so that the outlet refrigerant of the exhaust heat exchanger 5 becomes a gas single phase. To be. The control unit 110 may directly detect and control the refrigerant superheat degree at the outlet of the exhaust heat exchanger 5, but cools the compressor 1 input and the sensible heat amount of the discharge gas refrigerant (the discharge gas refrigerant is cooled until it becomes saturated gas). Since the heat exchange amount of the exhaust heat exchanger 5 is less than or equal to the compressor input, a control method may be used.

(Third equal distribution means)
The third equal distribution means is configured by the exhaust heat exchanger 5 whose size is adjusted so that the refrigerant is not condensed in the exhaust heat exchanger 5 at all times during the operation of the refrigeration cycle apparatus. Details will be described below.

  Since the refrigeration cycle apparatus of the first embodiment is operated throughout the year, the cooling load of the refrigerator 100 and the feed water temperature to the water heater 101 change depending on the environmental conditions. For this reason, it is assumed that the exhaust heat heat exchanger 5 is most likely to condense, for example, winter operation, and if the exhaust heat exchanger 5 is selected so that the refrigerant does not condense at this time, the exhaust heat exchanger 5 will not condense throughout the year. It becomes. Note that the winter operation as an example is performed while the outside air temperature is low, so that the cooling load of the refrigerator 100 is small and the water temperature is also low. Therefore, in the first embodiment, the exhaust heat heat exchanger 5 is the most. It is a condition that tends to condense.

  By adjusting the size of the exhaust heat exchanger 5 and preventing the refrigerant from condensing in this way, the refrigerant flowing into the condenser 2 can always be a gas single phase during the operation of the refrigeration cycle apparatus. it can.

(Fourth equal distribution means)
The fourth equal distribution means is configured by means for controlling the flow rate of water flowing into the exhaust heat exchanger 5 so that the refrigerant does not condense in the exhaust heat exchanger 5. Details will be described below.

  When the degree of superheat of the outlet refrigerant of the exhaust heat exchanger 5 is small, the control unit 110 controls the water circulation pump 7 to reduce the water flow rate and reduce the amount of heat exchange in the exhaust heat exchanger 5 to exhaust heat. The degree of superheat of the outlet refrigerant of the heat exchanger 5 is expanded. By increasing the degree of superheat of the outlet refrigerant of the exhaust heat exchanger 5, the outlet refrigerant of the exhaust heat exchanger 5 becomes a gas single phase. The controller 110 may directly detect and control the degree of refrigerant superheating at the outlet of the exhaust heat exchanger 5 as in the capacity control (second uniform distribution means) of the compressor 1. Since the amount of sensible heat of the discharge gas refrigerant (the amount of heat exchange for cooling the discharge gas refrigerant until it becomes saturated gas) is substantially equal, a control method for setting the heat exchange amount of the exhaust heat exchanger 5 to be less than or equal to the input of the compressor 1 It may be used. The control method of the water flow rate may control the capacity of the water circulation pump 7 as described above, but may control the water flow path resistance.

(Fifth equal distribution means)
The fifth equal distribution unit is configured by a heating unit that heats the water flowing into the exhaust heat exchanger 5 to a temperature equal to or higher than the refrigerant condensing temperature of the refrigerator 100 so that the refrigerant is not condensed in the exhaust heat exchanger 5. Yes. Details will be described below.

  If the temperature of the water flowing into the exhaust heat exchanger 5 is equal to or higher than the condensation temperature of the refrigerant, the refrigerant on the side to be cooled will not be reliably condensed. In order to make the water temperature equal to or higher than the condensing temperature, the water heater 101 may be preheated by the electric heater 8 or another heat source may be provided.

(Sixth equal distribution means)
If the temperature of the water flowing into the exhaust heat exchanger 5 is lower than the refrigerant condensation temperature, the sixth uniform distribution means passes only a part of the discharged gas refrigerant through the exhaust heat exchanger 5 to exchange heat with water. . On the other hand, if the temperature of the water flowing into the exhaust heat exchanger 5 is equal to or higher than the refrigerant condensation temperature, all of the discharged gas refrigerant is passed through the exhaust heat exchanger 5 to exchange heat with water. Details will be described below.

  If the water temperature is lower than the refrigerant condensing temperature, the water at the water temperature and the discharge gas refrigerant are heat-exchanged by the exhaust heat exchanger 5, and the temperature of the discharge gas refrigerant falls below the condensation temperature and condenses. There is a possibility that the phase refrigerant flows into the condenser 2. That is, when the water temperature is lower than the refrigerant condensing temperature, the two-phase refrigerant flows into the condenser 2 when all the discharged gas refrigerant flows into the condenser 2 through the exhaust heat exchanger 5. there is a possibility. Therefore, after condensing only a part of the discharge gas refrigerant through the exhaust heat exchanger 5, it is merged with the outlet of the condenser 2, and the other discharge gas refrigerants are not passed through the exhaust heat exchanger 5, as they are. It flows into the condenser 2. Therefore, since the refrigerant flowing into the condenser 2 is a gas refrigerant, the refrigerant can be evenly distributed by the distributor 22.

  On the other hand, when the water temperature is higher than the refrigerant condensing temperature, the refrigerant temperature does not fall below the refrigerant condensing temperature and does not condense even if heat is exchanged with water higher than the refrigerant condensing temperature. Therefore, when the water temperature is higher than the refrigerant condensation temperature, all of the discharged gas refrigerant is passed through the exhaust heat exchanger 5 to exchange heat with water, and then flows into the condenser 2. Hereinafter, a specific configuration will be described.

FIG. 4 is a diagram illustrating a configuration in which the refrigeration cycle apparatus according to Embodiment 1 of the present invention is provided with sixth equal distribution means. FIG. 5 is an operation explanatory diagram of each switching valve in FIG. 4 according to the relationship between the water temperature of the water flowing into the exhaust heat exchanger of FIG. 4 and the condensation temperature.
In the configuration of FIG. 1 described above, all of the discharge gas refrigerant discharged from the compressor 1 always passes through the exhaust heat exchanger 5, but in FIG. The configuration is such that all can be passed.

  The sixth equal distribution means includes a bypass circuit 30 that connects the inlet and the outlet of the condenser 2, and the exhaust heat exchanger 5 is installed in the bypass circuit 30. The sixth uniform distribution means includes another bypass circuit 31 that connects the outlet of the exhaust heat exchanger 5 and the inlet of the condenser 2. The sixth equal distribution means further includes a switching valve 30a for opening and closing the bypass circuit 30, a switching valve 31a for opening and closing the bypass circuit 31, and a bypass circuit 30 in the main circuit between the compressor 1 and the condenser 2. And a switching valve 32 provided downstream of the branch portion.

  When the temperature of the water flowing into the exhaust heat exchanger 5 is lower than the refrigerant condensation temperature, the switching valve 30a and the switching valve 32 are opened, the switching valve 31a is shut off, and the compressor 1 is discharged as shown in FIG. The refrigerant forms a flow path directly toward the condenser 2 and a flow path toward the outlet of the condenser 2 after passing through the exhaust heat exchanger 5 via the bypass circuit 30. Thereby, a part of the discharge gas refrigerant discharged from the compressor 1 flows into the exhaust heat exchanger 5 to heat the water by the condensation heat (exhaust heat of the discharge gas refrigerant), and from the exhaust heat exchanger 5. leak. On the other hand, the remainder of the discharge gas refrigerant flows into the condenser 2 with the gas single phase. Therefore, the refrigerant flowing into the condenser 2 is evenly distributed by the distributor 22 and passes through each refrigerant path of the condenser main body 21. The refrigerant after passing through each refrigerant path of the condenser body 21 merges with the refrigerant after passing through the exhaust heat exchanger 5.

  In this way, when a part of the discharged gas refrigerant flows into the exhaust heat exchanger 5 and heats the water by condensation heat, the flow rate of the bypass circuit 30 is adjusted and the exhaust heat exchanger 5 is surely subcooled. As a result, the refrigerant after joining at the outlet of the condenser 2 can reliably ensure supercooling. If supercooling of the liquid refrigerant cannot be ensured, it becomes a gas-liquid two-phase at the inlet of the expansion valve 3, so that the flow rate decreases and the refrigeration capacity decreases, hunting occurs and the operation becomes unstable. Problems such as enlargement occur. For this reason, it is necessary to ensure supercooling of the refrigerant at the outlet of the condenser 2. In order to control the flow rate of the bypass circuit 30, a flow rate adjustment valve may be installed in the bypass circuit 30 and the opening degree of the flow rate adjustment valve may be controlled by the control unit 110.

  On the other hand, when the water temperature is equal to or higher than the refrigerant condensation temperature, the switching valve 30a and the switching valve 32 are shut off and the switching valve 31a is opened as shown in FIG. In this case, a flow path similar to that of the first embodiment is formed. Therefore, all of the discharge gas refrigerant discharged from the compressor 1 flows into the exhaust heat exchanger 5 and heats the water with the exhaust heat of the discharge gas refrigerant. Even when water is heated by heat exchange with the discharge gas refrigerant, the water does not condense because the water temperature is equal to or higher than the condensation temperature. Therefore, the gas single-phase refrigerant flows into the condenser 2, and the distributor 22 of the condenser 2 can evenly distribute the refrigerant to each refrigerant path of the condenser body 21.

[Gas-liquid two-phase distribution type]
There are three types of gas-liquid two-phase distribution type equal distribution means. Hereinafter, it demonstrates in order.

(Seventh equal distribution means)
The seventh uniform distribution means reduces the pipe diameter of the inlet pipe 22b so that the refrigerant flow mode is distributed as an annular flow or an annular spray flow when the refrigerant flowing out of the exhaust heat exchanger 5 is in a gas-liquid two-phase. It is set. Details will be described below.

  Even if the refrigerant upstream of the condenser 2 is a gas-liquid two-phase, the liquid refrigerant can be evenly distributed by changing the refrigerant flow mode to an annular flow or an annular spray flow in the inlet pipe 22b of the distributor 22. Since the flow mode is mainly determined by the dryness of the refrigerant and the refrigerant flow rate at the inlet of the distributor 22, the flow mode of the refrigerant flowing through the inlet pipe 22b is exhausted so that the dryness and the refrigerant flow rate become an annular flow or an annular spray flow. The heat exchange amount of the heat heat exchanger 5 and the pipe diameter at the inlet of the distributor 22 are adjusted. Generally, by increasing the refrigerant flow rate (decreasing the pipe diameter of the inlet pipe 22b of the distributor 22), an annular flow or an annular spray flow is obtained. Determined. Specifically, as the degree of dryness increases, that is, as the heat exchange amount of the exhaust heat exchanger 5 decreases, the annular flow approaches the annular spray flow.

  When the pipe diameter of the inlet pipe 22b is set to ensure that the refrigerant flowing through the inlet pipe 22b is an annular spray flow that is a homogeneous flow, the distributor 22 can be configured with the header shown in FIG. However, when there is a possibility that the refrigerant flowing through the inlet pipe 22b becomes an annular flow, it is better to use the distributor shown in FIG.

FIG. 6 is a diagram showing another configuration example of the distributor in the condenser of the refrigeration cycle apparatus according to Embodiment 1 of the present invention.
The distributor 22 shown in FIG. 2 has a configuration in which a plurality of branch pipes 22c are connected to the side surface of the main pipe 22a. The distributor 22 shown in FIG. 6 has an inlet pipe 22b whose one end is connected to an end of the main pipe 22a on the refrigerant inflow side, one end connected to the refrigerant outflow side of the main pipe 22a, and the other end of the condenser main body 21. A plurality of branch pipes 22c connected to a plurality of refrigerant paths are provided, and a liquid film generation part 23 in the main pipe 22a is provided with a refrigerant inlet (distribution port) to the branch pipe 22c. The pipe diameter of the inlet pipe 22b is set so that the flow mode of the refrigerant flowing through the inlet pipe 22b is at least an annular flow.

  When there is a possibility that the refrigerant flowing through the inlet pipe 22b is an annular flow, the certainty of uniform distribution can be increased by using the distributor 22 shown in FIG. Further, in order to eliminate distribution bias due to the influence of gravity, it is more effective to arrange the distributor 22 in a posture in which the branch pipe 22c of the distributor 22 shown in FIG. 6 faces the vertical direction.

(Eighth equal distribution means)
The eighth equal distribution means is configured such that the number of the branch pipes 22c of the distributor 22 constituting the condenser 2 is two and the distribution to the condenser main body 21 is only two branches. Details will be described below.

  If the number of branches of the refrigerant flowing into the condenser 2 increases, equal distribution becomes difficult. Therefore, two refrigerant paths in the condenser 2 are provided, and distribution to the condenser body 21 is only two branches. Thereby, it becomes possible to distribute a refrigerant | coolant equally to each refrigerant path compared with the case where there are many branches. Even in such a bifurcated distribution, if the refrigerant flow mode is an annular flow or an annular spray flow as described above, or an installation posture that is not affected by gravity, it is more effective for even distribution. It is.

(Common effects of the seventh and eighth equal distribution means)
In the conventional configuration in which the refrigerant at the inlet of the condenser 2 cannot be evenly distributed when it becomes a gas-liquid two-phase, it is necessary to limit the heat exchange amount of the exhaust heat exchanger 5 so that the refrigerant at the inlet of the condenser 2 does not become a gas-liquid two-phase. Arise. However, by using the seventh and eighth equal distribution means, even if the refrigerant at the inlet of the condenser 2 becomes a gas-liquid two-phase, the condenser 2 can be evenly distributed as described above. Therefore, since there is no restriction | limiting of the heat exchange amount with respect to the exhaust heat exchanger 5, the area of the exhaust heat exchanger 5 can be expanded and a heat exchange amount can be increased significantly. As a result, the amount of exhaust heat recovered from the discharged gas refrigerant by the exhaust heat heat exchanger 5 can be increased, the time for boiling water can be greatly shortened, and even when the amount of hot water used is large.

  As described above, according to the first embodiment, even distribution means for evenly distributing the refrigerant to the refrigerant paths of the condenser 2 even if exhaust heat is recovered from the discharged gas refrigerant discharged from the compressor 1. Therefore, the performance degradation of the refrigerator 100 can be avoided reliably. Further, since the exhaust heat of the discharged gas refrigerant can be used effectively, high energy saving can be obtained throughout the year.

Embodiment 2. FIG.
FIG. 7 is a diagram illustrating the configuration of the refrigeration cycle apparatus according to Embodiment 2 of the present invention. In the following, the second embodiment will be described focusing on the differences from the first embodiment.
The first embodiment has a configuration in which the distributor 22 is provided downstream of the exhaust heat exchanger 5, but the second embodiment is upstream of the exhaust heat exchanger 5, that is, compressed with the exhaust heat exchanger 5. A distributor 22 is provided between the machine 1 and the machine 1. The second embodiment is characterized in that the distributor 22 corresponds to an equal distribution means and distributes the refrigerant upstream of the exhaust heat exchanger 5. The distributor 22 includes the header shown in FIG.

  With the above configuration, since the refrigerant flowing into the distributor 22 is always in a gas single phase, there is no possibility of gas-liquid two-phase distribution, and the refrigerant used in the header used as the distributor 22 can be reliably supplied. Even distribution is possible.

  In addition, in order to increase the efficiency of exhaust heat recovery, the exhaust heat exchanger 5 passes the refrigerant after distribution through the distributor 22 so that the exhaust heat can be recovered from all the refrigerant after distribution by the distributor 22. It is configured to exchange heat with the heat exchange medium. For example, the exhaust heat exchanger 5 is configured by a shell-and-tube heat exchanger in which pipes through which each refrigerant flows are inserted into a shell-like flow path through which water as a heat exchange medium flows. As another configuration of the exhaust heat exchanger 5, a configuration in which each pipe through which each refrigerant after distribution flows and a pipe through which water flows is brought into contact with each other to perform heat exchange is employed. If it is such a structure, even if it is the waste heat exchanger 5 in which water heat-exchanges with all the refrigerant | coolants after distribution, heat exchange is attained compactly and highly efficiently.

  As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and single-phase distribution (definitely equal) and two-phase distribution (no restriction on the amount of exhaust heat exchange). Both effects can be obtained simultaneously.

In the refrigerator 100 in the first embodiment or the second embodiment, the discharge gas refrigerant from the compressor 1 needs to be high temperature. These refrigerants, including HFC refrigerants, HFC refrigerants, HFO refrigerants, HC refrigerants, or natural refrigerants such as CO ₂ and ammonia, are all suitable for use of exhaust heat because they can be at high temperatures.

The present invention is particularly effective when used in a store (convenience store, supermarket) where a refrigeration apparatus, a hot water supply apparatus, and a hot water utilization apparatus are installed. In particular, since there are a large number of convenience stores, the CO ₂ reduction effect due to energy saving by adopting the present invention at each store is very large, and it is an extremely useful invention for improving environmental problems.

  DESCRIPTION OF SYMBOLS 1 Compressor, 2 Condenser, 3 Expansion valve, 4 Evaporator, 5 Waste heat exchanger (Heat exchanger), 6 Water storage tank, 7 Water circulation pump, 8 Electric heater, 9 Blower, 11 Refrigerant piping, 12 Water piping , 13 Gas-liquid separator, 13a piping, 21 Condenser body, 22 Distributor, 22a Main pipe, 22b Inlet pipe, 22c Branch pipe, 23 Liquid film generator, 30 Bypass circuit (first bypass circuit), 30a Switching valve, 31 bypass circuit (second bypass circuit), 31a switching valve, 32 switching valve, 60 laminated plate heat exchanger, 70 shell and tube heat exchanger, 100 refrigerator, 101 water heater, 102 showcase, 110 controller .

Claims (5)

A refrigeration cycle including a compressor, a multi-pass type air-cooled condenser having a condenser body having a plurality of refrigerant paths, a decompression unit, and an evaporator, and the refrigerant circulates;
A heat exchanger that performs heat exchange between a pipe through which the refrigerant discharged from the compressor passes and a pipe through which a heat exchange medium different from the condenser passes, and heats the heat exchange medium;
An equal distribution means for evenly distributing the refrigerant to the plurality of refrigerant paths of the condenser body ,
The equal distribution means is:
A second bypass circuit that bypasses the condenser and in which the heat exchanger is disposed, and that connects a refrigerant outlet of the heat exchanger in the first bypass circuit and a refrigerant inlet of the condenser in the refrigeration cycle. With a bypass circuit,
If the temperature of the heat exchange medium is lower than the condensation temperature of the refrigerant, a part of the refrigerant discharged from the compressor and going to the condenser flows into the first bypass circuit and passes through the heat exchanger. Let
If the temperature of the heat exchange medium is equal to or higher than the condensation temperature of the refrigerant, the refrigerant discharged from the compressor flows into the first bypass circuit and passes through the heat exchanger, and then the second bypass. A refrigeration cycle apparatus for flowing into the condenser from a circuit . The first bypass circuit, the condenser refrigeration cycle apparatus according to claim 1, further comprising a flow control valve for controlling the flow rate of the refrigerant to bypass the. The refrigeration cycle apparatus according to claim 2 , wherein the flow rate adjusting valve is adjusted so that the refrigerant is supercooled by the heat exchanger. The refrigeration cycle apparatus according to any one of claims 1 to 3 , wherein the refrigerant is an HFC refrigerant, an HFO refrigerant, an HC refrigerant, CO ₂ , or ammonia. Wherein the heat exchange medium, water, brine, HFC-based refrigerant, according to HFO refrigerants, HC-based refrigerant, CO _2, ammonia, any one of claims 1 to 4, characterized in that the air Refrigeration cycle equipment.

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