KR20110074069A - Refrigerant system - Google Patents

Abstract

PURPOSE: A refrigerant system is provided to maximize cooling performance since even if refrigerant flow into an indoor heat exchanger is interrupted, the refrigerant of an air conditioning unit and a cooling unit is continuously heat-exchanged in a first refrigerant heat exchanger. CONSTITUTION: A refrigerant system comprises an air conditioning unit(1), cooling units(2,3) and refrigerant heat exchangers(4). The air conditioning unit performs a refrigerant cycle for indoor air conditioning. The air conditioning unit comprises a first compressor(11), a first outdoor heat exchanger(14), first expansions units(131,132,133), an indoor heat exchanger(12) and first refrigerant pipes(101,102,103). The cooling unit performs a refrigerant cycle for cooling food. The cooling unit comprises a second compressor, a second outdoor heat exchanger(24), second expansion units(231,232), a second heat exchanger(22), and second refrigerant pipes(104,105). A third heat exchanger heat-exchanges the refrigerant of the air conditioning unit and the cooling unit.

Description

Refrigerant system

The present invention relates to a refrigerant system.

In general, a refrigerant system is a device that performs a refrigerant cycle consisting of compression, condensation, expansion, and evaporation, thereby cooling a room for cooling or storing food.

The refrigerant system includes a compressor for compressing a refrigerant, an indoor heat exchanger for exchanging refrigerant with indoor air, an expansion unit for expanding the refrigerant, and an outdoor heat exchanger for exchanging refrigerant with outdoor air. And an accumulator for catching a liquid refrigerant and a gaseous refrigerant among the refrigerants flowing into the compressor, a four-way valve for changing a flow direction of the refrigerant for performing the refrigerant cycle, and the indoor heat exchanger or the outdoor heat exchanger. Each may further include a fan forcibly flowing indoor air or outdoor air, and a motor for rotating the fan.

When the indoor cooling is performed, the indoor heat exchanger is an evaporation means, and the outdoor heat exchanger is a condensation means. When performing indoor heating, the indoor heat exchanger is a condensing means, and the outdoor heat exchanger is an evaporation means. The switching of the cooling and heating operation is performed by changing the flow direction of the refrigerant by the four-way valve.

The present invention is to provide a refrigerant system capable of maximizing the cooling performance of the refrigerant system even in a state in which room cooling and heating are not performed.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The refrigerant system according to the present invention proposed as described above includes an air conditioning side compressor, an air conditioning side outdoor heat exchanger, an air conditioning side expansion unit, an indoor heat exchanger, and an air conditioning side refrigerant pipe for performing a refrigerant cycle for cooling and cooling indoors. Air conditioning unit; A refrigeration unit including a refrigeration side compressor, a refrigeration side outdoor heat exchanger, a refrigeration side expansion unit, a refrigeration heat exchanger, and a refrigeration side refrigerant pipe for performing a refrigerant cycle for refrigerating food; A refrigeration unit including a refrigeration side compressor, a refrigeration side outdoor heat exchanger, a refrigeration side expansion unit, a refrigeration heat exchanger and a refrigeration side refrigerant pipe for performing a refrigerant cycle for freezing food; A first refrigerant heat exchanger configured to exchange heat between the refrigerant of the air conditioning unit and the refrigerant of the refrigerating unit; And a second refrigerant heat exchanger configured to exchange heat between the refrigerant of the refrigerating unit and the refrigerant of the refrigerating unit. The heat exchanger, the air-conditioning side expansion portion and the first refrigerant heat exchanger are characterized by flowing.

According to the refrigerant system according to the present invention as described above, even in a state in which the cooling and cooling of the room is not performed, that is, the refrigerant flow to the indoor heat exchanger is blocked, the heat exchange between the refrigerant in the air conditioning unit and the refrigerant in the cooling unit in the first refrigerant heat exchanger This is done continuously. Therefore, since the refrigerant in the cooling unit can be further supercooled as compared with the case where only the cooling side outdoor heat exchanger passes, the cooling performance of the refrigerant system can be maximized.

As the cooling performance of the refrigerant system can be maximized, the power consumption of the refrigerant system can be reduced.

Hereinafter, a refrigerant system according to the present invention will be described in more detail with reference to the accompanying drawings.

1 is a system configuration showing a refrigerant system according to the present invention.

Referring to FIG. 1, the refrigerant system includes an air conditioner 1 performing a refrigerant cycle for air conditioning in a room, and cooling units 2 and 3 performing a refrigerant cycle for cooling food. In detail, the cooling units 2 and 3 include a refrigeration unit 2 for cold storage of food and a freezing unit 3 for freezing storage of food. The refrigerant of the air conditioning unit 1, the refrigerant of the refrigerating unit 2, and the refrigerant of the freezing unit 3 flow independently of each other.

The air conditioning unit 1 includes an air conditioning side compressor 11 for compressing a refrigerant flowing through the air conditioning unit 1, an air conditioning side outdoor heat exchanger 14 for exchanging heat between the refrigerant and outdoor air, and a refrigerant. The air-conditioning expansion part (131, 132, 133) which expands, and the indoor heat exchanger (12) which performs heat exchange between a refrigerant | coolant and indoor air are included. The air conditioner 1 includes an accumulator 16 for separating a gaseous refrigerant and a liquid refrigerant from among refrigerants introduced into the air conditioner compressor 11, and a refrigerant discharged from the air conditioner compressor 11. Four-way valve 15 for switching the flow direction of the.

The refrigerating unit 2 includes a refrigerating side compressor 21 for compressing a refrigerant flowing through the refrigerating unit 2, a refrigerating side outdoor heat exchanger 24 in which heat exchange between the refrigerant and outdoor air is performed, and a refrigerant. A refrigeration-side inflation section (231,232) to expand, and a refrigeration heat exchanger (22) through which heat exchange between the refrigerant and the air adjacent to the food is performed.

The freezing unit 3 includes a freezing side compressor 31 for compressing a refrigerant flowing through the freezing unit 3, a freezing side outdoor heat exchanger 34 in which heat exchange between the refrigerant and outdoor air is performed; A fan motor assembly 35 for forcibly flowing outdoor air toward the outdoor heat exchanger, a refrigeration-side expansion part 33 for expanding the refrigerant, and a refrigeration heat exchanger 32 for performing heat exchange between the refrigerant and air adjacent to food. do.

On the other hand, the cooling unit (2, 3), the cooling side compressor for compressing the refrigerant flowing through the cooling unit (2, 3), and the cooling side outdoor heat exchanger that heat exchange between the refrigerant and outdoor air; A cooling-side expansion section for expanding the refrigerant, and a cooling heat exchanger in which heat exchange between the refrigerant and the air adjacent to the food is performed. The refrigeration side compressor includes the refrigeration side compressor 21 and the refrigeration side compressor 31, and the refrigeration side outdoor heat exchanger includes the refrigeration side outdoor heat exchanger 24 and the refrigeration side outdoor heat exchanger 34. The refrigeration side expansion part includes the refrigeration side expansion part (231, 232) and the refrigeration side expansion part (33), and the refrigeration heat exchanger includes the refrigeration heat exchanger (22) and the refrigeration heat exchanger (32).

In this case, the air-conditioning expansion unit (131, 132, 133), the refrigeration-side expansion unit (231, 232), the freezing-side expansion unit 33, for example, the solenoid valve can open and close the flow of the refrigerant, the expansion of the refrigerant and the amount of refrigerant flow can be adjusted It can be a variety of devices. The refrigerant system also includes a fan motor assembly 6 for forcibly flowing outdoor air toward the air conditioning side outdoor heat exchanger 14 and the refrigerating side outdoor heat exchanger 24. When the air conditioning-side outdoor heat exchanger 14 and the refrigeration-side outdoor heat exchanger 24 are adjacent to each other, the fan motor assembly 6 is provided as one and the air conditioning-side outdoor heat exchanger 14 and the refrigerating-side outdoor heat exchanger 14 24) Outdoor air may be forced to flow toward all of them. However, when the air conditioning side outdoor heat exchanger 14 and the refrigeration side outdoor heat exchanger 24 are spaced apart from each other, the two air conditioning side outdoor heat exchangers 14 and the refrigeration side outdoor heat exchanger 24 respectively correspond to two pieces. The fan motor assembly may be provided.

On the other hand, the refrigerant system includes a refrigerant heat exchanger (4, 5) for heat exchange between the air conditioning unit (1) and the refrigerating unit (2) or the refrigerating unit (2) and the freezing unit (3). do. In more detail, the refrigerant heat exchanger (4, 5), the first refrigerant heat exchanger (4) and the refrigerating unit (2) in which heat exchange between the refrigerant of the air conditioning unit 1 and the refrigerant of the refrigerating unit (2) is performed. And a second refrigerant heat exchanger (5) through which heat exchange is performed between the refrigerant of the refrigerant and the refrigerant of the freezer (3).

At this time, inside the first refrigerant heat exchanger (4), the two passages (41, 42) so that the refrigerant of the air conditioning unit (1) and the refrigerant of the refrigerating unit (2) can flow independently of each other Is formed. In addition, inside the second refrigerant heat exchanger 5, two flow paths 51 and 52 are provided to allow the refrigerant in the refrigerating unit 2 and the refrigerant in the freezing unit 3 to exchange heat with each other independently. Is formed.

The first refrigerant heat exchanger (4) is connected in parallel with the indoor heat exchanger (12) on the air conditioner (1). In more detail, the air conditioning unit 1 further includes air conditioning side refrigerant pipes 101, 102, and 103 for guiding the refrigerant flow of the air conditioning unit 1. The air conditioning side refrigerant pipes 101, 102 and 103 may include a first refrigerant pipe 101 connecting the compressor, the air conditioning side outdoor heat exchanger 14, and the first refrigerant heat exchanger 4, and the air conditioning side compressor 11. The second refrigerant pipe 102 for guiding the refrigerant discharged from the refrigerant or the refrigerant discharged from the outdoor heat exchanger to the indoor heat exchanger 12 and a bypass pipe connected in parallel with the third expansion unit 131 which will be described later. (103). That is, one end of the second refrigerant pipe 102 is connected to one point of the first refrigerant pipe 101 corresponding to the air conditioning side outdoor heat exchanger 14 and the indoor heat exchanger 12, The other end of the second refrigerant pipe 102 is connected to the other point of the first refrigerant pipe 101 corresponding to between the indoor heat exchanger 12 and the air conditioning compressor 11. One end of the bypass pipe 103 is connected to the first refrigerant pipe 101 corresponding to the air conditioner-side outdoor heat exchanger 14 and the third expansion part 131, and the bypass pipe 103. The other end of is connected to the first refrigerant pipe 101 corresponding to the third expansion unit 131 and the first refrigerant heat exchanger (4).

In this case, the bypass pipe 103 is provided with a flow restriction unit 17 for restricting the refrigerant flow through the bypass pipe 103 in a predetermined direction. In more detail, the flow restrictor 17 prevents the refrigerant from the indoor heat exchanger 12 toward the air conditioning-side outdoor heat exchanger 14 to pass through the bypass pipe 103. Therefore, the refrigerant from the indoor heat exchanger 12 toward the air conditioning side outdoor heat exchanger 14 passes through the third expansion part 131. Here, the flow restriction unit 17 may be a variety of devices that can limit the refrigerant direction in a certain direction, for example, a check valve.

The air conditioning side expansion parts 131, 132, and 133 may include a first expansion part 132 installed in the first refrigerant pipe 101 corresponding to an inflow side of the indoor heat exchanger 12, and the refrigerant heat exchanger ( To the second expansion part 133 provided in the second refrigerant pipe 102 corresponding to the inflow side of the 4,5 and the first refrigerant pipe 101 adjacent to the air conditioning side outdoor heat exchanger 14. It includes a third expansion portion 131 is installed. The air conditioning side expansion parts 131, 132 and 133 may adjust the opening degree of the air conditioning side refrigerant pipes 101 and 102 and may selectively shield the air conditioning side refrigerant pipes 101 and 102. In more detail, the first expansion part 132 may adjust the amount of refrigerant flowing into the indoor heat exchanger 12 and selectively block the refrigerant flow toward the indoor heat exchanger 12, and the second expansion The unit 133 may control the amount of refrigerant flowing into the refrigerant heat exchangers 4 and 5 and selectively block the refrigerant flow toward the refrigerant heat exchangers 4 and 5. The third expansion part 131 expands the refrigerant flowing into the air conditioning-side outdoor heat exchanger 14, or the refrigerant passing through the air conditioning-side outdoor heat exchanger 14 passes through the third expansion part 131. The first refrigerant pipe (101) can be blocked to bypass).

In this case, the first expansion unit 132 may be referred to as a flow blocking unit 71 in terms of selectively blocking the refrigerant flow toward the indoor heat exchanger 12.

The second refrigerant heat exchanger (5) is connected in parallel with the refrigeration heat exchanger (22) on the refrigeration unit (2). In more detail, the refrigerating unit 2 further includes refrigerating side refrigerant pipes 104 and 105 for guiding the refrigerant flowing through the refrigerating unit 2. The refrigerating side refrigerant pipes 104 and 105 may include a third refrigerant pipe 104 connecting the refrigerating side compressor 21, the refrigerating side outdoor heat exchanger 24, and the second refrigerant heat exchanger 5, and the second refrigerant pipe 104. A fourth refrigerant pipe 105 for guiding a part of the refrigerant flowing into the refrigerant heat exchanger (5) to the refrigeration heat exchanger (22). That is, one end of the fourth refrigerant pipe 105 is connected to one point of the third refrigerant pipe 104 corresponding to between the refrigeration side compressor 21 and the refrigeration heat exchanger 22, and the fourth The other end of the refrigerant pipe 105 is connected to the other point of the third refrigerant pipe 104 corresponding to between the refrigerating side outdoor heat exchanger 24 and the refrigerant heat exchangers 4 and 5.

On the other hand, the second refrigerant heat exchanger 5 is connected in series with the refrigeration heat exchanger 32 on the freezer 3. In more detail, the freezing unit 3 further includes a freezing side refrigerant pipe 106 for guiding the coolant flowing through the freezing unit 3. The refrigeration side refrigerant pipe 106, the refrigeration side compressor (31), refrigeration side outdoor heat exchanger (34), second refrigerant heat exchanger (5), refrigeration side expansion unit (33), refrigeration heat exchanger (32) Connect sequentially.

Here, the cooling unit (2, 3) comprises a cooling side refrigerant pipe (104, 105) for guiding the refrigerant flowing through the cooling unit (2, 3), the cooling side refrigerant pipe (104, 105) is the refrigeration side refrigerant It can also be seen that it includes a pipe (104, 105) and a refrigerant refrigerant pipe (106).

The refrigeration side expansion parts 231 and 232 may include a fourth expansion part 232 provided in the third refrigerant pipe 104 corresponding to the inflow side of the second refrigerant heat exchanger 5, and the refrigeration heat exchange. And a fifth expansion part 231 installed in the fourth refrigerant pipe 105 corresponding to the inflow side of the gas 22.

On the other hand, the refrigeration unit (2) includes a flow switching unit (251, 252) for switching the flow direction of the refrigerant flowing through the refrigeration unit (2). The flow switching units 251, 252, and 253 change the flow direction of the refrigerant discharged from the refrigerating side compressor 21 toward the refrigerant heat exchanger 4, 5 or the refrigerating side outdoor heat exchanger 24. The first flow diverter 251 and the second flow diverter 252 for selectively blocking the flow of the refrigerant toward the refrigeration side outdoor heat exchanger (24).

In more detail, as the direction of the first flow switching unit 251 changes, the refrigerant discharged from the refrigerating side compressor 21 is in the order of the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4. Or the first refrigerant heat exchanger 4 and the refrigerating side outdoor heat exchanger 24. In addition, the refrigerant discharged from the refrigerating side compressor 21 or the first refrigerant heat exchanger 4 flows into the refrigerating side outdoor heat exchanger 24 according to the change of the direction of the second flow switching unit 252. The first refrigerant heat exchanger 4 or the refrigeration heat exchanger 22 may be introduced directly without passing through the refrigeration side outdoor heat exchanger 24. Finally, the refrigerant passing through the refrigerating heat exchanger 22 or the second refrigerant heat exchanger 5 flows into the refrigerating side compressor 21 according to the change of the direction of the third flow diverter 253, It may be introduced into the second connection pipe (8).

Here, the flow switching unit 251, 252 may be a variety of devices that can change the flow direction of the refrigerant, for example, the four-way valve 15 for selectively communicating four directions.

Hereinafter, the refrigerant flow when the refrigerant system according to the present invention is operated in the cooling mode will be described in detail with reference to the accompanying drawings.

2 is a view showing the refrigerant flow of the refrigerant system operating in the cooling mode according to the present invention, Figure 3 is a view showing the refrigerant flow of the refrigerant system operating in the heating mode according to the present invention.

Referring to FIG. 2, when the refrigerant system is operated in the cooling mode, the refrigerant flow of the air conditioning unit 1 is examined. The high temperature and high pressure refrigerant discharged from the air conditioning compressor 11 is the air conditioning side outdoor heat exchanger ( 14). At this time, the four-way valve 15 located between the air conditioning side compressor 11 and the air conditioning side outdoor heat exchanger 14, the refrigerant discharged from the air conditioning side compressor 11 is the air conditioning side outdoor heat exchanger (14) Guide the flow direction of the refrigerant to flow toward.

While the refrigerant flows through the air conditioning-side outdoor heat exchanger 14, the refrigerant releases heat to outdoor air to condense to a low temperature and high pressure. The refrigerant passing through the air conditioning-side outdoor heat exchanger 14 is expanded at a low temperature and low pressure while passing through the first expansion part 132 of the air conditioning-side expansion parts 131, 132, and 133. At this time, the third expansion part 131 is maintained in a closed state, and the refrigerant passing through the air conditioning-side outdoor heat exchanger 14 flows into the first expansion part 132 through the bypass pipe 103. Will be.

The refrigerant passing through the first expansion part 132 flows into the indoor heat exchanger 12. As the refrigerant flows through the indoor heat exchanger 12, the refrigerant absorbs heat from the indoor air and evaporates to a high temperature and low pressure.

The refrigerant passing through the indoor heat exchanger 12 is introduced into the accumulator 16. In this case, the four-way valve 15 positioned between the indoor heat exchanger 12 and the accumulator 16 may allow the refrigerant passing through the indoor heat exchanger 12 to flow into the accumulator 16. To guide the flow direction.

In the process of passing the refrigerant through the accumulator 16, the liquid phase of the refrigerant is filtered out, and only the refrigerant in the gas phase is introduced into the air conditioning compressor 11 again. In the process of passing the refrigerant through the air conditioning compressor 11, the refrigerant is compressed to a high temperature and high pressure.

As the refrigerant flow as described above is continued, cooling of the room may be performed.

Next, referring to the refrigerant flow of the refrigerating unit 2, the high temperature and high pressure refrigerant discharged from the refrigerating side compressor 21 passes through the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4. Done.

At this time, the refrigerant discharged from the refrigerating side compressor 21 sequentially moves the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4 according to the change of the direction of the first flow switching unit 251. Or in reverse order. In addition, the refrigerant discharged from the refrigerating side compressor 21 flows into the refrigerating side outdoor heat exchanger 24 or the refrigerating side outdoor heat exchanger 24 according to the change of the direction of the second flow switching unit 252. It may be introduced directly into the first refrigerant heat exchanger (4) or the refrigerated heat exchanger (22) without passing through.

In the course of passing the refrigerant through at least one of the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4, the refrigerant is condensed at a low temperature and high pressure. More specifically, in the process of passing the refrigerant through the refrigeration side outdoor heat exchanger 24, the refrigerant releases heat to outdoor air. In the process of passing the refrigerant through the first refrigerant heat exchanger 4, the refrigerant of the refrigerating unit 2 releases heat to the refrigerant of the air conditioning unit 1. Therefore, the refrigerant is condensed in a state of low temperature and high pressure.

At this time, when the refrigerant passes through both the refrigeration-side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4, the refrigerant-side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4 Compared to the case where only one passes, the refrigerant may be supercooled to reach a relatively low temperature state. Therefore, when the refrigerant passes through both the refrigeration-side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4, the refrigerating unit ( There is an advantage that the cooling performance coefficient (COP) of 2) can be relatively high.

The refrigerant passing through at least one of the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4 flows into the refrigerating side expansion units 231 and 232. In more detail, the refrigerant passing through at least one of the refrigerating side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4 flows into the fourth expansion part 232 and the fifth expansion part 231. In the process of passing the refrigerant through the refrigerating side expansion parts 231 and 232, the refrigerant is expanded at a low temperature and low pressure.

The refrigerant passing through the fourth expansion part 232 flows into the second refrigerant heat exchanger 5, and the refrigerant passing through the fifth expansion part 231 flows into the refrigeration heat exchanger 22. All. That is, the refrigerant passing through the refrigerating side expansion parts 231 and 232 flows into the second refrigerant heat exchanger 5 and the refrigeration heat exchanger 22.

In the process of passing the refrigerant through the second refrigerant heat exchanger (5), the refrigerant of the refrigerating unit (2) absorbs heat from the refrigerant of the freezing unit (3) and evaporates to high temperature and low pressure. In the course of passing the refrigerant through the refrigeration heat exchanger 22, the refrigerant absorbs heat of air adjacent to the refrigeration heat exchanger 22 and evaporates to high temperature and low pressure.

The refrigerant passing through the second refrigerant heat exchanger 5 and the refrigeration heat exchanger 22 flows toward the refrigeration side compressor 21. In the process of passing the refrigerant through the refrigerating side compressor 21, the refrigerant is compressed to a high temperature and high pressure.

Finally, looking at the refrigerant flow of the freezer (3), the refrigerant of the high temperature and high pressure discharged from the freezer side compressor 31 is introduced into the freezer side outdoor heat exchanger (34). In the process of passing the refrigerant through the freezing side outdoor heat exchanger 34, the refrigerant releases heat to outdoor air to condense to a low temperature and high pressure.

The refrigerant passing through the freezing side outdoor heat exchanger 34 is introduced into the second refrigerant heat exchanger 5. In the process of passing the refrigerant through the second refrigerant heat exchanger (5), the refrigerant of the freezing unit (3) releases heat to the refrigerant of the refrigerating unit (2) to condense to a low temperature low pressure state.

At this time, when the refrigerant passes through both the refrigeration side outdoor heat exchanger 34 and the second refrigerant heat exchanger 5, the refrigerant side outdoor heat exchanger 34 and the second refrigerant heat exchanger 5 Compared to the case where only one passes, the refrigerant may be supercooled to reach a relatively low temperature state. Therefore, when the refrigerant passes through both the refrigeration side outdoor heat exchanger 34 and the second refrigerant heat exchanger 5, the refrigerant section (1) passes through only the refrigeration side outdoor heat exchanger 34. There is an advantage that the cooling performance coefficient (COP) of 3) can be relatively high.

 The refrigerant passing through the second refrigerant heat exchanger 5 flows into the freezing side expansion part 33. In the course of passing the refrigerant through the freezing side expansion part 33, the refrigerant is expanded to a low temperature and low pressure. The refrigerant passing through the freezing side expansion part 33 flows into the freezing heat exchanger 32. In the course of passing the refrigerant through the refrigeration heat exchanger (32), the refrigerant absorbs heat from air adjacent to the refrigeration heat exchanger (32) to evaporate to a high temperature and low pressure.

Then, the refrigerant passing through the refrigeration heat exchanger 32 is compressed again to a state of high temperature and high pressure while passing through the refrigeration side compressor (31).

Referring to FIG. 3, when the refrigerant system operates in a heating mode, looking at the refrigerant flow of the air conditioning unit 1, the refrigerant discharged from the air conditioning compressor 11 is transferred to the indoor heat exchanger 12. Inflow. At this time, the four-way valve 15 guides the flow direction of the refrigerant so that the refrigerant discharged from the air conditioning compressor (11) can flow to the indoor heat exchanger (12).

In the process of passing the refrigerant through the indoor heat exchanger (12), the refrigerant releases heat to indoor air to condense to low temperature and high pressure. The refrigerant passing through the indoor heat exchanger 12 flows into the third expansion part 131 of the air conditioning side expansion parts 131, 132, and 133. At this time, since the refrigerant passing through the indoor heat exchanger 12 cannot pass through the bypass pipe 103 by the flow restriction part 17, the refrigerant flows into the third expansion part 131. The third expansion part 131 is maintained in the fully open state, so that the actual expansion of the refrigerant is made in the third expansion part 131. That is, in the process of passing the refrigerant through the third expansion part 131, the refrigerant is expanded at a low temperature and low pressure.

The refrigerant passing through the third expansion part 131 flows into the air conditioning-side outdoor heat exchanger 14. In the process of passing the refrigerant through the air conditioning-side outdoor heat exchanger 14, the refrigerant absorbs heat from the outdoor air and evaporates to a high temperature and low pressure.

The refrigerant discharged from the air conditioning side outdoor heat exchanger 14 flows into the accumulator 16 to filter the liquid refrigerant and the gaseous refrigerant. At this time, the four-way valve 15 guides the flow direction of the refrigerant so that the refrigerant discharged from the air conditioning-side outdoor heat exchanger 14 flows into the accumulator 16. Then, only the refrigerant in the gaseous phase filtered by the accumulator 16 flows into the air conditioning compressor 11, and is compressed to high temperature and high pressure again.

As this refrigerant flow continues, heating of the room can be performed.

On the other hand, when the refrigerant system operates in the heating mode, the refrigerant flow in the refrigerating unit 2 and the freezing unit 3 is the same as when the refrigerant system operates in the cooling mode.

Hereinafter, the refrigerant flow in the case where the refrigerant system according to the present invention operates in the non-air conditioning mode will be described in detail with reference to the accompanying drawings.

4 is a view showing the flow of the refrigerant in a state in which the refrigerant system according to the present invention is operated in a non-air conditioning mode.

Referring to FIG. 4, in the refrigerant system, the use of the air conditioner 1 may not be necessary.

In more detail, while the refrigerant system is operated in the heating mode, a target condition of the heating operation may be satisfied. In this case, the target condition means a state of the room that the user wants or feels comfortable. For example, the target condition may be a case where the room temperature reaches a set temperature.

In this case, the temperature of the room desired by the user or the temperature of the room that the user feels comfortable can be set in advance. When the refrigerant system is operated in the heating mode, the room is heated by the refrigerant cycle performed by the air conditioning unit 1 to increase the temperature of the room. When the indoor temperature reaches the set indoor temperature, the target condition of the heating operation may be satisfied.

When the target condition of the heating operation is satisfied, the heating of the room by the air conditioning unit 1 needs to be stopped. That is, the use of the air conditioner 1 is not necessary. However, the refrigerator 2 and the freezer 3 for the storage of food need to be operated continuously. The operating state in this case is called non-air conditioning mode.

Looking at the refrigerant flow when the refrigerant system operates in the non-air conditioning mode, the refrigerant flow toward the indoor heat exchanger 12 is blocked. In more detail, the first expansion part 132 is closed to block the refrigerant discharged from the air conditioning side compressor 11 or the air conditioning side outdoor heat exchanger 14 toward the indoor heat exchanger 12. do.

Therefore, the high temperature and high pressure refrigerant discharged from the air conditioning side compressor 11 flows to the air conditioning side outdoor heat exchanger 14. At this time, the four-way valve 15 guides the flow direction of the refrigerant so that the refrigerant discharged from the air conditioning side compressor 11 flows to the air conditioning side outdoor heat exchanger 14.

In the process of passing the refrigerant through the air conditioning-side outdoor heat exchanger 14, the refrigerant discharges heat to outdoor air to condense to a low temperature and high pressure. The refrigerant passing through the air conditioning side outdoor heat exchanger 14 flows into the second expansion part 133. In this case, since the third expansion part 131 is kept closed, the refrigerant passing through the air conditioning side outdoor heat exchanger 14 flows into the second expansion part 133 through the bypass pipe 103. do.

In the process of passing the refrigerant through the second expansion part 133, the refrigerant is expanded to a low temperature low pressure state and then flows into the first refrigerant heat exchanger. In the process of passing the refrigerant through the first refrigerant heat exchanger 4, the refrigerant of the air conditioning unit 1 absorbs heat from the refrigerant of the refrigerating unit 2 and evaporates to a high temperature and low pressure.

The refrigerant passing through the first refrigerant heat exchanger 4 is separated into a liquid refrigerant and a gaseous refrigerant while passing through the accumulator 16. Then, only the refrigerant in the gaseous phase passing through the accumulator 16 flows into the air conditioning compressor 11.

On the other hand, the refrigerant flow of the refrigerating unit 2 and the refrigerating unit 3 when the refrigerant system is operated in the non-air conditioning mode is the same as when the refrigerant system is operated in the cooling or heating mode.

According to the refrigerant system, the cooling performance coefficient COP of the refrigerant system may be higher than that when the refrigerant flowing through the refrigerating unit 2 passes only through the refrigerating side outdoor heat exchanger 24. More specifically, the temperature of the refrigerant passing through both the refrigeration-side outdoor heat exchanger 24 and the first refrigerant heat exchanger 4 is lower than that of the refrigerant passing through only the refrigeration-side outdoor heat exchanger 24. do. That is, the refrigerant may be subcooled as it additionally passes through the first refrigerant heat exchanger (4). As the refrigerant is supercooled, the amount of heat absorbed by the refrigerant through the second refrigerant heat exchanger 5 and the refrigeration heat exchanger 22 may be further increased. Therefore, the cooling performance coefficient COP of the refrigerant system can be further increased.

In addition, the cooling performance coefficient (COP) of the refrigerant system is proportional to the cooling performance of the refrigerant system, and as the value of the cooling performance coefficient (COP) increases, the cooling performance of the refrigerant system may be interpreted to increase. Therefore, the refrigerant system has an advantage of exhibiting an increased cooling performance as compared with the case where the refrigerant in the refrigerating unit 2 passes only the refrigerating side outdoor heat exchanger 24.

As such, within the scope of the basic technical idea of the present invention, many modifications are possible to those skilled in the art, and the scope of the present invention should be interpreted based on the appended claims. will be.

1 is a system configuration showing a refrigerant system according to the present invention.

2 is a view showing a refrigerant flow in the refrigerant system operating in the cooling mode according to the present invention.

3 is a view showing the refrigerant flow in the refrigerant system operating in the heating mode according to the present invention.

4 is a view showing the refrigerant flow in the refrigerant system operating in the non-air conditioning mode according to the present invention.

Claims (11)

An air conditioning unit including a air conditioning side compressor, an air conditioning side outdoor heat exchanger, an air conditioning side expansion unit, an indoor heat exchanger, and an air conditioning refrigerant pipe for performing a refrigerant cycle for cooling and heating the room; A cooling unit including a cooling side compressor, a cooling side outdoor heat exchanger, a cooling side expansion unit, a cooling heat exchanger, and a cooling side refrigerant pipe for performing a refrigerant cycle for cooling the food; And And a refrigerant heat exchanger configured to exchange heat between the refrigerant of the air conditioning unit and the refrigerant of the cooling unit. When the target condition is satisfied during the heating operation, in the state in which the refrigerant flow to the indoor heat exchanger is blocked, the refrigerant of the air conditioning unit flows through the air conditioning side compressor, the air conditioning side outdoor heat exchanger, the air conditioning side expansion unit, and the refrigerant heat exchanger. Refrigerant system, characterized in that. The method of claim 1, The cooling unit, Refrigerating unit for performing a refrigerant cycle for refrigeration of food; And Refrigerating unit for performing a refrigerant cycle for the freezing of food; refrigerant system comprising a. The method of claim 2, Refrigerant system, characterized in that the refrigerant in the refrigerating unit and the refrigerant in the freezing unit flows independently of each other. The method of claim 2, And a refrigerant heat exchanger configured to exchange heat between the refrigerant of the refrigerator and the refrigerant of the refrigerator. The method of claim 1, And a flow blocker for selectively blocking the flow of the refrigerant toward the indoor heat exchanger. The method of claim 1, The air conditioning side expansion portion, A first expansion part installed in an air conditioning side refrigerant pipe corresponding to an inflow side of the indoor heat exchanger; And And a second expansion part installed at an air conditioning side refrigerant pipe corresponding to an inflow side of the refrigerant heat exchanger. The method of claim 1, And the first expansion unit expands the refrigerant flowing into the indoor heat exchanger or selectively blocks the flow of the refrigerant toward the indoor heat exchanger. The method of claim 1, And the indoor heat exchanger and the refrigerant heat exchanger are connected in parallel on the air conditioning side refrigerant pipe. The method of claim 1, The air conditioning side refrigerant pipe, A first refrigerant pipe connecting the air conditioning side compressor, the air conditioning side outdoor heat exchanger, and the refrigerant heat exchanger; And And a second refrigerant pipe guiding the refrigerant discharged from the air conditioning compressor or the refrigerant discharged from the air conditioning side outdoor heat exchanger to the indoor heat exchanger. The method of claim 9, And the refrigerant in the refrigerating unit, the freezing unit, and the first refrigerant pipe flows while the refrigerant flow in the second refrigerant pipe is blocked. The method of claim 1, Refrigerant system, characterized in that the refrigerant of the air conditioning unit and the refrigerant of the cooling unit flows independently.

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