KR101299019B1 - Refrigeration cycle apparatus - Google Patents

Abstract

PURPOSE: A refrigeration cycle apparatus is provided with accurate capacity according to user environment, and to maximize efficiency. CONSTITUTION: A refrigeration cycle apparatus comprises a compressor (10), an outer exchanger (20), an expansion valve (30), an inner heat exchanger (40), and an auxiliary heat exchanger (70). The compressor compresses working fluid. The outer heat exchanger exchanges heat of compressed working fluid with air, and discharges the heat. The expansion valve expans the working fluid heat exchanged in the outer heat exchanger. The working fluid disappears in the inner heat exchanger. The auxiliary heat exchanger discharges the heat to the outside, and delivers the heat to the expansion valve.

Description

[0001] Refrigeration cycle apparatus [0002]

The present invention relates to a refrigeration cycle apparatus, and more particularly to a refrigeration cycle apparatus that is operated by varying the degree of heat exchange with the outside air in accordance with the temperature conditions of the outside air in dissipating heat to the outside through heat exchange with the outside air.

The refrigeration cycle apparatus is operated to cool a desired space or to discharge heat of a specific area or material to the outside. Such a refrigeration cycle apparatus receives heat to be discharged to the outside of the refrigerant and heats it with the outside air. Emissions are common.

Accordingly, the operation and efficiency of the refrigeration cycle apparatus are greatly influenced by the environment in which the refrigeration cycle apparatus is used. For example, when the temperature of the outside air is high, the amount of heat discharged from the refrigeration cycle apparatus to the outside air is reduced, resulting in a problem that the efficiency of the refrigeration cycle apparatus as a whole deteriorates.

As in Korea, there are four seasons, when the external temperature is severely changed, the operation of the refrigeration cycle device causes a large difference in efficiency depending on the external temperature, that is, the season. May fail.

In addition, in Korea, the operation temperature of the refrigeration cycle apparatus is different due to the high external temperature in the summer compared to the central region in the southern region. As such, in order to design a refrigeration cycle apparatus for an area having various external temperature conditions, the capacity of the heat exchanger for heat exchange with the outside air is inevitably increased. However, this is an overdesign of the refrigeration cycle apparatus is a cause for increasing the manufacturing cost of the refrigeration cycle apparatus.

Japanese Laid-Open Patent Publication No. 2013-007522 Japanese Patent Laid-Open No. 2010-151392 Japanese Laid-Open Patent 1996-152208 Japanese Laid-Open Patent 1993-180519

Accordingly, an object of the present invention is to solve the conventional problems as described above, so that the optimum efficiency can be generated in spite of seasonal environmental factors in using a refrigeration cycle apparatus.

Another object of the present invention is to selectively employ a secondary heat exchanger for heat exchange with the outside air in the refrigeration cycle apparatus, and to selectively use the auxiliary heat exchanger to make and employ a refrigeration cycle apparatus with a precise capacity suitable for the environment in which it is used.

According to a feature of the present invention for achieving the above object, the present invention is a compressor for compressing the working fluid, an external heat exchanger for discharging heat to the outside by heat-exchanging the working fluid compressed in the compressor with external air, An expansion valve for expanding the working fluid heat-exchanged in the external heat exchanger, an internal heat exchanger in which the working fluid expanded in the expansion valve receives heat and evaporates, and selectively transferring the working fluid from the external heat exchanger according to operating conditions And a subsidiary heat exchanger for discharging heat to the outside through heat exchange with external air and transferring it to the expansion valve, and the flow cross-sectional area of the working fluid is relatively upstream of the flow path of the working fluid in the subsidiary heat exchanger. Multiple flow pipes are used for flow in a specific direction to widen and flow cross-sectional area as it goes downstream In order to reduce the number of flow pipes used in the flow in a particular direction is reduced, and the second pipe connected to the expansion valve coming out of the external heat exchanger is connected to the first connection valve to selectively supply the working fluid to the auxiliary heat exchanger And a second connection valve is connected to a second pipe connecting the working fluid from the auxiliary heat exchanger to the expansion valve to transfer the working fluid passing through the auxiliary heat exchanger to the expansion valve.

delete

The first and second connecting valves are three-way valves, respectively.

Inlet valves and outlet valves are installed at the inlet side and outlet side of the auxiliary heat exchanger, respectively, to control the flow of the working fluid to and from the auxiliary heat exchanger.

The auxiliary heat exchanger is located upstream on the flow path of the outside air flowing toward the external heat exchanger.

The auxiliary heat exchanger is installed on at least one side of both sides of the installation frame in which the compressor, the external heat exchanger, and the like are installed.

The auxiliary heat exchanger includes a first head having an inlet and an outlet, a second head corresponding to the first head, and a flow path pipe connecting the first head and the second head to transfer a working fluid. The heat radiation fins are installed between the flow path tubes.

The flow path tube has a flat cross section.

The supply of the working fluid to the auxiliary heat exchanger is made when the outside air temperature is above the set value, and continues to operate as the auxiliary heat exchanger while the temperature T2 of the working fluid leaving the external heat exchanger is higher than the temperature T3 of the working fluid before entering the external heat exchanger. Supply the fluid.

In supplying the working fluid to the auxiliary heat exchanger, if the difference between the temperature T4 of the working fluid passing through the internal heat exchanger at a temperature T3 of the working fluid at the inlet of the external heat exchanger is smaller than the set value, the fan is started and the compressor is stopped. -If T4 is greater than the set value, start both fan and compressor continuously.

Comparing the temperature T1 at the inlet of the auxiliary heat exchanger with the temperature T2 at the outlet, if T1> T2, no more working fluid is sent to the auxiliary heat exchanger, and if T1 = T2 or T1 <T2, the working fluid is continued to the auxiliary heat exchanger. To send.

In the refrigeration cycle apparatus according to the present invention, the following effects can be obtained.

First, in the present invention, the auxiliary heat exchanger is provided so that the refrigerant is exchanged to the outside heat exchanger only when necessary, so that the refrigeration cycle apparatus can achieve the optimum efficiency regardless of seasonal factors.

Further, in the present invention, since the auxiliary heat exchanger can be selectively employed in the refrigeration cycle apparatus using a three-way valve, the overdesign of the refrigeration cycle apparatus can be prevented, thereby minimizing the manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a configuration diagram showing a configuration of a preferred embodiment of a refrigeration cycle apparatus according to the present invention; Fig.
Figure 2 is a plan view showing a state in which some components constituting the embodiment of the present invention is installed.
Figure 3 is a side view showing a state in which some components constituting the embodiment of the present invention is installed.
Figure 4 is a schematic block diagram showing the configuration of an auxiliary heat exchanger constituting an embodiment of the present invention.
5 is a sectional view taken along the line AA in Fig.
FIG. 6 is an enlarged view of area A of FIG. 4; FIG.

Hereinafter, preferred embodiments of the refrigeration cycle apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the refrigeration cycle apparatus of this embodiment has a compressor 10. The compressor (10) compresses the refrigerant as an operating oil and makes it easy to liquefy at room temperature. The working fluid from the compressor 10 is delivered to the external heat exchanger 20 through the first pipe 10 '.

The external heat exchanger 20 performs heat exchange with the outside air while flowing the working fluid through the inside thereof. That is, heat is transferred from the working fluid to the outside air. The outside air is pressurized by the fan 21 to take heat from the working fluid passing through the external heat exchanger 20 while passing through the external heat exchanger 20 so that the working fluid becomes a liquid phase. The temperature sensor 22 is installed at the outlet side of the external heat exchanger 20 in the second pipe 20 '. The temperature sensor 22 measures the temperature of the working fluid passed through the external heat exchanger (20). In addition, an outside air temperature sensor (not shown) is provided near the fan 21 to measure and provide an outside temperature, that is, a temperature of the outside air. Information provided by the outside air temperature sensor may be used to control the open / closed state of the first connection valve 50 to be described below.

The working fluid from the external heat exchanger 20 is delivered to the expansion valve 30 through the second pipe 20 '. The expansion valve 30 expands the working fluid of the liquid state to easily evaporate. The working fluid exiting the expansion valve 30 flows through the second pipe 30 ′ and is delivered to the internal heat exchanger 40.

The internal heat exchanger 40 is connected to the second pipe 30 'and receives a working fluid delivered through the second pipe 30' to exchange heat with indoor air. Of course, the internal heat exchanger 40 does not necessarily perform heat exchange with the indoor air, but also conducts heat exchange with another intermediate medium. A working fluid flows through the interior of the internal heat exchanger 40 and heat exchanges as the indoor air or an intermediate medium passes through the outside of the internal heat exchanger 40. The working fluid receives internal heat from the indoor air or the intermediate medium. It is evaporated in the exchanger 40. The internal heat exchanger 40 is connected to the compressor 10 through a fourth pipe 40 '. Accordingly, the working fluid from the internal heat exchanger 40 is transferred to the compressor 10 and then compressed again to flow through the external heat exchanger 20, the expansion valve 30, and the internal heat exchanger 40, .

Meanwhile, a first connecting valve 50 is installed in the second pipe 20 '. The first connection valve 50 serves to selectively change the flow path of the working fluid flowing along the second pipe 20 'to the first auxiliary pipe 50'. The first connection valve 50 may be a three-way valve. When the first connection valve 50 is operated, information provided by the temperature sensor 22 is utilized. For example, when the outside temperature rises above a predetermined value, a working fluid flows toward the auxiliary heat exchanger 70. Make the working fluid more condensed.

The receiver 60 is installed in the first auxiliary pipe 50 '. The receiver 60 temporarily stores the working fluid. Before and after the receiver 60, the stop valve 62 is installed. The stop valve 62 controls the flow of the working fluid into and out of the receiver 60 and prevents leakage of the working fluid during repair of the receiver 60.

An auxiliary heat exchanger 70 is connected to an opposite end of the second auxiliary pipe 60 ′ connected to the receiver 60. The auxiliary heat exchanger 70 is a portion in which the working fluid heat exchanges with the outside air. The auxiliary heat exchanger 70 is provided outside the external heat exchanger 20 is installed. That is, it is located upstream of the flow path of the external air entering the external heat exchanger (20). This can be seen in Figures 2 and 3, the compressor (10). It is attached to the outer surface of the installation frame 11 in which the external heat exchanger 20, the dryer 60, etc. are installed.

The auxiliary heat exchanger 70 is generally made in a plate shape, the detailed structure of which is shown in FIGS. The auxiliary heat exchanger 70 is provided with a first header 71 and a second header 72 on both sides. The inner space 71 ′ of the first head 71 is partitioned into a plurality of partition plates 71 ″, and the inner space 72 ′ of the second head 72 is also divided into a plurality of partition plates 72 ″. It is divided into

The first head 71 and the second head 72 are connected by a plurality of flow pipes 73. Therefore, the working fluid flows from the first inner space 71 ′ of the first head 71 to the first inner space 72 ′ of the second head 72. The configuration of the flow path tube 73 is a flat tube shape as shown in FIG. The flow path tube 73 has a substantially rectangular shape, and the heat dissipation fins 74 are provided between the flow path pipes 73. Heat exchange occurs while the outside air passes through the heat radiating fins 74.

The number of flow path tubes 73 connecting between the heads 71 and 72 is reduced from the inlet side to the outlet side. This configuration is well illustrated in FIG. That is, the working fluid is moved from the first inner space 71 ′ of the first head 71 to the first inner space 72 ′ of the second head 72 through three flow pipes 73, and then again. The working fluid is configured to move from the first inner space 72 ′ of the two heads 72 to the second inner space 71 ′ of the first head 71 through the three flow channels 73.

However, the working fluid flows through the two flow pipes 73 from the second inner space 71 'of the first head 71 to the second inner space 72' of the second head 72. Also, the working fluid flows through the two flow pipes 73 from the second inner space 72 'of the second head 72 to the third inner space 71' of the first head 71. .

Next, the working fluid flows through the one flow pipe 73 from the third inner space 71 'of the first head 71 to the third inner space 72' of the second head 72. It is composed. The working fluid flows through the one flow pipe 73 from the third inner space 72 'of the second head 72 to the fourth inner space 71' of the first head 71. .

In addition, the degree of protruding end portions of the flow path tubes 73 through the first head 71 and the second head 72 into the inner spaces 71 'and 72' varies depending on the state of the working fluid. Is formed. This is to facilitate the flow of the working fluid, for example, the working fluid is more protruding in the case of a large liquid state than the case of a large gaseous state. This is well illustrated in FIG. 6.

In the present embodiment, the auxiliary heat exchanger 70 is provided at both ends of the installation frame 11, and the number of the auxiliary heat exchangers 70 varies depending on design conditions. Inlet valves 76 and outlet valves 76 'are provided at the inlet side and the outlet side of the auxiliary heat exchanger 70, respectively. The inlet valve 76 and the outlet valve 76 ′ control the amount of working fluid passing through the auxiliary heat exchanger 70 and prevent leakage of the working fluid during maintenance of the auxiliary heat exchanger 70. Play a role.

The first temperature sensor 77 and the second temperature sensor 78 are respectively installed at the side of the auxiliary heat exchanger 70 at the inlet valve 76 and the outlet valve 76 '. The temperature sensors 77 and 78 are for acquiring information for determining the amount of working fluid passing through the auxiliary heat exchanger 70. The working fluid passing through the auxiliary heat exchanger 70 flows along the third auxiliary pipe 70 '.

The dryer 80 is connected to the third auxiliary pipe 70 '. The dryer 80 serves to absorb moisture mixed in the working fluid. The fourth auxiliary pipe 80 ′ is connected to the outlet side of the dryer 80. The fourth auxiliary pipe 80 ′ is connected to the second pipe 20 ′ and the second connection valve 90. The second connection valve 90 is also connected to the expansion valve 30 side as a three-way valve. The second connection valve 90 is connected between the dryer 80, the first connection valve 50 and the expansion valve 30.

Hereinafter, the operation of the refrigeration cycle apparatus according to the present invention will be described in detail.

In the present invention, if the temperature measured by the temperature sensor 22 exceeds a preset value or otherwise, a predetermined condition, a working fluid passes through the auxiliary heat exchanger 70 in the auxiliary heat exchanger 70. Allow working fluid to release heat to the outside air. This is in case the high outside temperature does not condense the working fluid by only heat discharge from the external heat exchanger (20). When the condensation of the working fluid is not properly in the external heat exchanger 20 is to send the working fluid to the auxiliary heat exchanger 70 to further discharge the heat to the outside.

At this time, the auxiliary heat exchanger 70 is to meet the external air before the external heat exchanger 20 on the path through which the external air flows so that the temperature difference between the auxiliary heat exchanger 70 and the external air is external to the external heat exchanger 20. It is larger than in, so heat exchange can be done well. In addition, the auxiliary heat exchanger 70 has a flat rectangular cross section of the flow pipe 73 through which the working fluid flows, so that the heat of the working fluid can be better transmitted to the outside.

Now, the refrigeration cycle apparatus of the present invention will be described in more detail. It will be described from the compressor 10 to perform a heat exchange cycle while the working fluid changes phase. In the compressor 10, the working fluid is compressed. In general, in the compressor 10, the working fluid is made to be easily liquefied at room temperature.

The working fluid compressed by the compressor 10 moves along the first pipe 10 ′ and is delivered to the external heat exchanger 20. The working heat flows inside the external heat exchanger 20 to exchange heat with the outside. The outside air is transferred to the external heat exchanger 20 by the fan 21. As the outside air passes through the external heat exchanger 20 and exchanges heat with the working fluid, the outside air receives heat from the working fluid and the working fluid is in a liquid state.

The working fluid heat-exchanged in the external heat exchanger 20 is moved along the second pipe 20 '. In the second pipe 20 ′, a working fluid flows according to the information provided by the temperature sensor 22 or an operating condition of a preset device. That is, under the control of the first connecting valve 50, the working fluid flows along the second pipe 20 ′ to the expansion valve 30 or toward the auxiliary heat exchanger 70.

Here will be described a case in which the operating fluid is sent to the auxiliary heat exchanger 70 to perform heat exchange. First, when the outside temperature exceeds a certain value, the working fluid is sent to the auxiliary heat exchanger (70). For example, when the outside air temperature exceeds 35 ° C., the first connecting valve 50 causes the working fluid to flow toward the auxiliary heat exchanger 70. Let's go.

As shown in FIG. 1, when the temperature T2 of the working fluid which has passed through the auxiliary heat exchanger 70 is higher than the temperature T3 before entering the external heat exchanger 20, the heat exchange in the auxiliary heat exchanger 70 is continued. Let this be done.

At this time, if the difference between the temperature T4 of the working fluid passing through the internal heat exchanger at the temperature T3 of the working fluid at the inlet of the external heat exchanger 20 is smaller than the set value, the fan 21 is started and the compressor 10 is stopped. This is because the load required for the refrigeration cycle apparatus is reduced to stop the operation of the compressor 10 to minimize the operation of the refrigeration cycle apparatus.

And when T3-T4 is larger than the set value, both the fan 21 and the compressor 10 are continuously started. This is because both the fan 21 and the compressor 10 are driven to satisfy the required load because there is some load required while operating the auxiliary heat exchanger 70.

In addition, since the outside temperature is higher than the set value, the working fluid is sent to the auxiliary heat exchanger 70 for heat exchange, and the cycle is operated by comparing T3 and T4. The temperature T1 and the outlet at the inlet of the auxiliary heat exchanger 70 By comparing the temperature T2 at and continue to send a working fluid to the auxiliary heat exchanger 70 to determine whether to proceed with the heat exchange.

That is, if T1> T2, the working fluid is no longer sent to the auxiliary heat exchanger 70, and if T1 = T2 or T1 <T2, the working fluid is continuously sent to the auxiliary heat exchanger 70 to continue the auxiliary heat exchanger 70. Allow heat exchange at

On the other hand, when the working fluid flows to the expansion valve 30, the working fluid is expanded in a state that is easy to evaporate from the expansion valve 30, and then flows to the internal heat exchanger (40). While passing through the internal heat exchanger 40, the working fluid receives heat by heat exchange with indoor air. In general, the working fluid receives heat from the internal heat exchanger 40 and evaporates.

The working fluid evaporated by heat exchange in the internal heat exchanger 40 is transferred to the compressor 10 and compressed again in the compressor 10 to repeat the above-described process.

On the other hand, the operation when the working fluid flows from the external heat exchanger 20 to the auxiliary heat exchanger 70 by the first connection valve 50 will be described. The working fluid passing through the first connection valve 50 enters the auxiliary heat exchanger 70 through the receiver 60.

In the auxiliary heat exchanger 70, the first head 71 flows from the first head 71 to the second head 72 through the flow pipe 73, and again in the second head 72, as shown in FIG. The working fluid exchanges heat between the first head 71 and the second head 72 by flowing through the flow pipe 73 to the head 71. The heat dissipation fins 74 are installed between the flow path tubes 73 to facilitate heat exchange in the auxiliary heat exchanger 70.

In addition, when the working fluid flows inside the auxiliary heat exchanger 70, a relatively large amount of working fluid is initially present in the gaseous state, and the working fluid in the liquid state is gradually moved downstream from the inside of the auxiliary heat exchanger 70. Increases. Thus, the flow inside the auxiliary heat exchanger 70 requires a relatively large flow cross section in the upstream section and a relatively small flow cross section in the downstream section. Therefore, in the auxiliary heat exchanger 70 of the present invention, the working fluid flows properly.

The working fluid from the auxiliary heat exchanger 70 is transferred to the expansion valve 30 passing through the second connecting valve 90 through the dryer 80 along the second auxiliary pipe 70 '. The operation after the expansion valve 30 is as described above.

Meanwhile, in the present invention, the first and second connection valves 50 and 90 are parts installed in the auxiliary pipes 50 ', 60', 70 'and 80' like the auxiliary heat exchanger 70. Make them easy to install. That is, it is possible to additionally install these components between the internal heat exchanger 20 and the expansion valve 30 in the existing refrigeration cycle apparatus. In addition, the stop valve 62, the inlet valve 76 and the outlet valve 76 ′ facilitate installation and maintenance of the receiver 60 and the auxiliary heat exchanger 70, respectively.

In particular, the auxiliary heat exchanger 70 is preferably located upstream of the flow path of the external air delivered to the external heat exchanger 20, it can be achieved by being installed on both outer surfaces of the installation frame (11). . As described above, since the auxiliary heat exchangers 70 may be installed on both outer surfaces of the installation frame 11 without changing the installation state of other components, the installation and maintenance of the auxiliary heat exchangers 70 may be more easily performed. Can be done.

It is to be understood that the scope of the present invention is not limited to the above-described embodiments but is defined by the scope of the claims, and those skilled in the art can make various modifications and alterations within the scope of the claims It is self-evident.

For example, two auxiliary heat exchangers 70 are used as shown in FIG. 2, but not necessarily, but only one auxiliary heat exchanger 70 may be installed.

For reference, a receiver and a dryer may be installed in the second pipe 20 ′ between the first connection valve 50 and the expansion valve 30. This is because it is necessary to optimally maintain the state of the working fluid when the working fluid flows from the first connection valve 50 to the expansion valve 30 without passing through the auxiliary heat exchanger 70.

10: compressor 10 ': first piping
11: Mounting frame 20: External heat exchanger
20 ': 2nd piping 21: fan
22: temperature sensor 30: expansion valve
30 ': third pipe 40: internal heat exchanger
40 ': 4th piping 50: 1st connecting valve
50 ': first auxiliary pipe 60: receiver
60 ': secondary auxiliary pipe 62: stop valve
70; Auxiliary heat exchanger 71: first head
71 ': Internal space 71 ": Partition plate
72: second head 72 ': interior space
72 ": Partition plate 73: Euro tube
74: heat radiation fin 76: inlet valve
76 ': outlet valve 77: first temperature sensor
78: second temperature sensor 80: dryer
80 ': fourth auxiliary pipe 90: second connection valve

Claims (11)

delete A compressor for compressing the working fluid,
An external heat exchanger configured to discharge heat to the outside by heat-exchanging the working fluid compressed by the compressor with external air;
An expansion valve for expanding a working fluid heat exchanged in the external heat exchanger;
An internal heat exchanger in which the working fluid expanded in the expansion valve receives heat and evaporates;
And an auxiliary heat exchanger selectively receiving the working fluid from the external heat exchanger according to operating conditions to discharge heat to the outside through heat exchange with external air, and to transfer it to the expansion valve.
In the upstream part of the flow path of the working fluid inside the auxiliary heat exchanger, a plurality of flow channels are used for the flow in a specific direction so that the flow cross-sectional area of the working fluid is relatively wide, and the flow cross-sectional area is reduced in the downstream direction. The number of flow pipes used for flow is reduced,
A first connection valve is connected to the second pipe connected to the expansion valve from the external heat exchanger to selectively transfer the working fluid to the auxiliary heat exchanger, and to connect the working fluid from the auxiliary heat exchanger to the expansion valve. A second connection valve is connected to the second pipe is a refrigeration cycle device for delivering a working fluid passed through the auxiliary heat exchanger to the expansion valve.
The refrigeration cycle apparatus according to claim 2, wherein the first and second connection valves are three-way valves, respectively.
3. The refrigerating unit of claim 2, wherein an inlet valve and an outlet valve are provided at the inlet side and the outlet side of the auxiliary heat exchanger, respectively, and the inlet and outlet valves control the flow of the working fluid to and from the auxiliary heat exchanger. Cycle system.
The refrigeration cycle apparatus according to any one of claims 2 to 4, wherein the auxiliary heat exchanger is located upstream on the flow path of the outside air flowing toward the external heat exchanger.
The refrigeration cycle apparatus according to claim 5, wherein the auxiliary heat exchanger is installed on at least one of both sides of an installation frame in which the compressor, the external heat exchanger, and the like are installed.
7. The flow path of claim 6, wherein the auxiliary heat exchanger connects a first head having an inlet and an outlet, a second head corresponding to the first head, and a working fluid connected between the first head and the second head. And a heat dissipation fin between the passage pipes.
8. The refrigeration cycle apparatus according to claim 7, wherein the flow path tube has a flat cross section.
5. The supply of the working fluid to the auxiliary heat exchanger is made when the outside air temperature is above the set value, wherein the temperature T2 of the working fluid exiting the external heat exchanger before entering the external heat exchanger. A refrigeration cycle system for continuously supplying working fluid to the auxiliary heat exchanger while the working fluid is above the temperature T3.
10. The method of claim 9, wherein in supplying the working fluid to the auxiliary heat exchanger, the fan is started when the difference between the temperature T4 of the working fluid passing through the internal heat exchanger at a temperature T3 of the working fluid at the inlet of the external heat exchanger is smaller than the set value. A compressor cycle stops, and the refrigeration cycle unit continues to start both the fan and the compressor when T3-T4 is greater than the set value.
11. The method of claim 10, wherein the temperature T1 at the inlet of the subsidiary heat exchanger is compared to the temperature T2 at the outlet, and no more working fluid is sent to the subsidiary heat exchanger if T1> T2, and continued if T1 = T2 or T1 <T2. Refrigeration cycle system to send the working fluid to the auxiliary heat exchanger.

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