JP2017116122A - Heat exchange device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange device in which a heat transfer coefficient on a refrigerant side and a heat transfer coefficient on a liquid side such as water have been improved, and to provide a heat exchange device which includes compactness and maintainability.SOLUTION: A heat exchange device 1 includes: an air-cooled heat exchanger 10 for performing heat exchange between a refrigerant and air; and water heat exchangers 20A, 20B for performing heat exchange between the refrigerant and water. Also, expansion valves 45A, 45B for expanding the refrigerant compressed by a compressor 41 are provided at the water heat exchangers 20A, 20B respectively. In the water heat exchangers 20A, 20B, the refrigerant flows in parallel and the water flows in series. Then, the heat exchange device 1 is divided into two housings and accommodated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat exchange device.

  Widely used compressors, heat exchangers with air, expansion mechanisms, heat exchangers with liquids such as water, and heat exchange devices that exchange heat between air and liquids such as water via refrigerant It has been.

  Patent Document 1 includes a compressor, a flow path switching valve, an air heat exchanger, an expansion mechanism, and a plurality of water heat exchangers. The plurality of water heat exchangers include a plurality of water. A water flow path connecting the heat exchangers in series is provided, and the relative flow direction between the refrigerant in the refrigerant flow path and the water in the water flow path in one water heat exchanger is at least one other water heat. A refrigerating apparatus having a different flow direction between the refrigerant in the refrigerant flow path and the water in the water flow path in the exchanger is described.

  In Patent Document 2, a heat exchanging unit having an air heat exchanger at the top is mounted, a housing in which a machine room is formed, and the air heat housed in the machine room in the housing. Four independent refrigeration cycles consisting of refrigeration cycle equipment excluding the exchanger, one water circulation pump, a control box with control electronics, and the first and second refrigeration cycles in parallel A chilling unit is described that includes a first water heat exchanger to be connected and a second water heat exchanger to which the third and fourth refrigeration cycles are connected in parallel.

  In Patent Document 3, which is used as an outdoor unit such as a refrigeration air conditioner and a chilling unit, unit bases of two outdoor units are respectively fixed on a connection base, and one refrigerant is connected via a pipe. A structure connected to a circuit is described.

  In Patent Document 4, a plurality of heat source side units and use side units are separated, and in each heat source side unit, a heat medium system including a compressor and a heat source side heat exchanger is formed. Describes a chiller device in which a heat medium system including a use side heat exchanger and a pump that sends the heat medium to the use side heat exchanger is formed.

JP 2009-276039 A Japanese Patent No. 5401563 JP 2013-257093 A JP 2014-206330 A

By the way, in the heat exchange device, in order to improve the efficiency of heat exchange, improvement of the heat transfer coefficient (heat transfer coefficient) on the refrigerant side and the heat transfer coefficient (heat transfer coefficient) on the liquid side such as water is required. .
In addition, the heat exchange device is required to have a small volume, easy transportation and installation (compactness), and ease of maintenance (maintenance).

An object of the present invention is to provide a heat exchange device that improves the heat transfer coefficient on the refrigerant side and the heat transfer coefficient on the liquid side such as water.
Another object of the present invention is to provide a heat exchange device having compactness and maintainability.

For this purpose, a heat exchange device to which the present invention is applied includes a first heat exchanger that exchanges heat between a refrigerant and air or a liquid, and a plurality of heat exchangers that exchange heat between the refrigerant and a liquid. A second heat exchanger. Further, the heat exchange device includes a compressor that compresses the refrigerant. The heat exchange device includes a plurality of expansion mechanisms that are provided in each of the plurality of second heat exchangers and expand the refrigerant compressed by the compressor. In the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series.
In such a heat exchange device, the plurality of expansion mechanisms provided in each of the plurality of second heat exchangers may be configured such that a difference in temperature of refrigerant discharged from each of the plurality of second heat exchangers. It can be characterized in that it is set so as to suppress the occurrence of.
Furthermore, it can be characterized by comprising a bypass flow path in which the liquid flows around at least one of the plurality of second heat exchangers.

In addition, for this purpose, the heat exchange device to which the present invention is applied includes a first heat exchanger that performs heat exchange between the refrigerant and air or liquid, and heat exchange between the refrigerant and liquid. A plurality of second heat exchangers to perform. Further, the heat exchange device includes a compressor that compresses the refrigerant. The heat exchange device includes an expansion mechanism that is provided in common to the plurality of second heat exchangers and expands the refrigerant compressed by the compressor. In the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series. The plurality of second heat exchangers are set to have different heat transfer areas.
In such a heat exchange device, the heat transfer area of each of the plurality of second heat exchangers is set so as to suppress the occurrence of a difference in heat transfer amount between the plurality of second heat exchangers. It can be characterized by that.

  Furthermore, for this purpose, the heat exchange device to which the present invention is applied includes the first housing and the second housing, and the two first heat exchangers that perform heat exchange between the refrigerant and air or liquid. And a heat exchanger. Further, the heat exchange device includes a compressor that compresses the refrigerant, an accumulator that accumulates the refrigerant, a multi-way valve that switches a passage direction of the refrigerant, and a refrigerant pipe that delivers the refrigerant. Furthermore, the heat exchange device includes a second heat exchanger that exchanges heat between the refrigerant and the liquid, and a liquid pipe that delivers the liquid. And the said 1st housing | casing accommodates the liquid circuit through which a liquid flows including the said 2nd heat exchanger and the said liquid piping at least. The second housing contains a refrigerant circuit through which a refrigerant flows, including at least the compressor, the accumulator, the multi-way valve, and the refrigerant pipe. Further, the first casing and the second casing accommodate each of the two first heat exchangers.

In such a heat exchange apparatus, the first casing includes a casing panel that can be opened and closed. An operation direction of a coupling flange of the liquid pipe accommodated in the first casing and a power control panel for controlling the power of the liquid circuit may be provided on the casing panel side. .
In such a heat exchange device, the second heat exchanger housed in the first housing may be plural. Here, a plurality of expansion mechanisms are provided in each of the plurality of second heat exchangers to expand the refrigerant compressed by the compressor. In the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series.
And in such a heat exchange apparatus, it can be provided with the detour channel which a liquid flows by detouring at least one of a plurality of said 2nd heat exchangers.

  Furthermore, in such a heat exchange device, the second heat exchanger housed in the first housing may be plural. Here, an expansion mechanism is provided which is provided in common to the plurality of second heat exchangers and expands the refrigerant compressed by the compressor. In the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series. The plurality of second heat exchangers are set to have different heat transfer areas.

ADVANTAGE OF THE INVENTION According to this invention, the heat exchange apparatus which improved the heat transfer rate in the refrigerant | coolant side and the heat transfer rate in liquid sides, such as water, can be provided.
Moreover, according to this invention, the heat exchange apparatus provided with compactness and maintainability can be provided.

It is a figure explaining an example of the heat exchange apparatus with which 1st Embodiment is applied. It is a figure explaining an example of the heat exchange apparatus with which 1st Embodiment is not applied. It is a figure explaining an example of the heat exchange apparatus with which 2nd Embodiment is applied. It is a figure explaining an example of the heat exchange apparatus with which 3rd Embodiment is applied. It is a figure explaining an example of the heat exchange system which operated the some heat exchange apparatus in parallel. It is a figure explaining the external appearance of an example of the heat exchange apparatus with which 5th Embodiment is applied. It is a figure explaining an example of the heat exchange apparatus with which 5th Embodiment is applied. It is a figure explaining an example of the modification of the heat exchange apparatus with which 5th Embodiment is applied.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. In addition, this invention is not limited to the following embodiment. Various modifications can be made within the scope of the gist. Further, the drawings to be used are for explaining the present embodiment and do not represent the actual size.

[First Embodiment]
<Configuration of Heat Exchanger 1>
FIG. 1 is a diagram illustrating an example of a heat exchange device 1 to which the first exemplary embodiment is applied. The illustrated heat exchange device 1 is called a heat pump or a heat pump device. The heat exchange device 1 is used for cooling or heating a liquid such as water to a predetermined temperature, for example. And this heat exchange apparatus 1 is used for a refrigerator, a refrigerator, an air conditioner, etc.

The heat exchange device 1 includes an air-cooled heat exchanger 10 (hereinafter referred to as an air-cooled heat exchanger 10) that exchanges heat between air and a refrigerant, and a liquid such as water and a refrigerant. And a plurality of heat exchangers 20 (hereinafter referred to as water heat exchangers 20) that perform heat exchange. Here, it is assumed that the heat exchange device 1 includes two water heat exchangers 20A and 20B. In addition, although demonstrated in FIG. 1 as providing the water heat exchangers 20A and 20B, it is not limited to two. In addition, when not distinguishing water heat exchanger 20A, 20B, it describes with the water heat exchanger 20. FIG.
The liquid may be an antifreeze such as glycerin instead of water, but here, water will be described as an example of the liquid.
The air-cooled heat exchanger 10 may exchange heat between a liquid such as water and a refrigerant instead of air. In this case, the air-cooled heat exchanger 10 may be read as a liquid-cooled heat exchanger. Here, it demonstrates as air and a refrigerant | coolant exchange heat.
Here, the air-cooled heat exchanger 10 is an example of a first heat exchanger, and the water heat exchanger 20 is an example of a second heat exchanger.

And the heat exchange apparatus 1 is provided with the refrigerant | coolant piping 30 which circulates a refrigerant | coolant between the air-cooling type heat exchanger 10 and the water heat exchangers 20A and 20B.
The refrigerant is, for example, a low boiling point chlorofluorocarbon (fluorocarbon). The refrigerant may be other than chlorofluorocarbon.

The heat exchange device 1 includes a fan 11 that blows air to the air-cooled heat exchanger 10. The heat exchange device 1 also includes a compressor 41 and an accumulator 42 connected to a refrigerant pipe 30 that circulates the refrigerant. Furthermore, the heat exchange device 1 includes a four-way valve (four-way switching valve) 43 and an expansion valve 44. The heat exchange device 1 includes an expansion valve 45 in each of the plurality of water heat exchangers 20. Here, the plurality of water heat exchangers 20 will be described as water heat exchangers 20A and 20B, and the expansion valve 45 will also be described as two expansion valves 45A and 45B. When the expansion valves 45 </ b> A and 45 </ b> B are not distinguished from each other, they are expressed as the expansion valve 45.
Here, the expansion valve 45 (expansion valves 45A and 45B) is an example of an expansion mechanism.

The air-cooled heat exchanger 10 exchanges heat with air by circulating a refrigerant therein. For example, the air-cooled heat exchanger 10 includes a cooling pipe through which a refrigerant is passed. And the thing of the cross fin type which attached the fin to the outer side of this cooling pipe is used. In order to improve the efficiency of heat exchange in the air-cooled heat exchanger 10, the cooling pipes are composed of a plurality of rows, and each is bent and arranged in a zigzag shape.
The air-cooled heat exchanger 10 functions as a condenser when the heat exchanger 1 cools water, and functions as an evaporator when heating water.

  The fan 11 is, for example, a propeller fan. The fan 11 has a propeller (blade) attached around the rotation axis. Then, as the propeller rotates, air is pumped by the propeller to generate an air flow along the rotation axis direction. By blowing this air flow on the air-cooled heat exchanger 10, heat exchange in the air-cooled heat exchanger 10 is promoted.

The water heat exchanger 20 performs heat exchange between the refrigerant and water by adjoining a path for circulating the refrigerant and a path for circulating water. The water heat exchanger 20 is, for example, a plate (flat plate) type heat exchanger. The plate heat exchanger uses a thin plate such as stainless steel or titanium as a heat transfer plate. The necessary number of heat transfer plates are stacked (stacked) and fixed by brazing.
The gap formed between the heat transfer plates is used as a flow path, and the high temperature fluid and the low temperature fluid are adjacent to each other with the heat transfer plate interposed therebetween. That is, the plate heat exchanger performs heat exchange between the high temperature fluid and the low temperature fluid via the heat transfer plate. Therefore, in the plate heat exchanger, the heat transfer amount (exchange heat amount) between the high-temperature fluid and the low-temperature fluid is set by the number of heat transfer plates (number of stacked layers).

Here, the heat transfer amount (exchange heat amount) refers to the amount of heat energy transferred (exchange amount) per unit time. The heat transfer amount is determined by the heat transfer area, the flow rate of the liquid to be cooled or heated, the specific heat of the liquid to be cooled or heated, the temperature change of the liquid to be cooled or heated, the overall heat transfer coefficient, the logarithm average temperature difference, etc. . The heat transfer area is an area where heat is transferred between the high temperature fluid and the low temperature fluid, and corresponds to the number of heat transfer plates.
The overall heat transfer coefficient represents the performance of the water heat exchanger 20. The overall heat transfer coefficient is determined by the high temperature side film heat transfer coefficient, the low temperature side film heat transfer coefficient, the thickness of the heat exchange wall surface (heat transfer plate), the heat conductivity of the heat exchange wall surface (heat transfer plate), and the like. . Here, the high-temperature side film heat transfer coefficient and the low-temperature side film heat transfer coefficient are the efficiency of heat transfer when a thin boundary layer (film) is assumed near the heat exchange wall (heat transfer plate) ( Thermal efficiency). This boundary layer (boundary film) becomes a heat transfer resistance against heat transfer. This heat transfer resistance becomes thinner as the fluid turbulence is larger, that is, the larger the fluid flow velocity, the higher the efficiency of heat transfer. That is, the high temperature side film heat transfer coefficient increases as the thickness of the high temperature side film decreases. The low-temperature side film heat transfer coefficient increases as the thickness of the low-temperature side film decreases. That is, both the high temperature side film heat transfer coefficient and the low temperature side film heat transfer coefficient increase as the fluid flow velocity increases.
Here, the high-temperature side film heat transfer coefficient and the low-temperature side film heat transfer coefficient are read as the heat transfer coefficient (heat transfer coefficient) on the refrigerant side and the heat transfer coefficient (heat transfer coefficient) on the liquid side.

Here, the water heat exchangers 20 </ b> A and 20 </ b> B will be described as plate heat exchangers having the same configuration. That is, it is assumed that the water heat exchangers 20A and 20B have the same number of heat transfer plates and have the same heat transfer area.
The water heat exchanger 20 functions as an evaporator when the heat exchanger 1 cools water, and functions as a condenser when heating water.

In the water heat exchanger 20A, the refrigerant flows between the refrigerant inlet / outlet 20Aa and the refrigerant inlet / outlet 20Ab. In the water heat exchanger 20B, the refrigerant flows between the refrigerant inlet / outlet 20Ba and the refrigerant inlet / outlet 20Bb. In addition, the direction of the flow of the refrigerant differs depending on whether the heat exchange device 1 cools water or heats water. For this reason, it is described as an entrance / exit.
In the water heat exchanger 20A, water flows between the water inlet 20Ac and the water outlet 20Ad. In the water heat exchanger 20B, water flows between the water inlet 20Bc and the water outlet 20Bd. The direction of the water flow is the same when the heat exchanger 1 cools the water and when the water is heated. For this reason, it describes as an entrance and an exit.
And in water heat exchanger 20A, 20B, water and a refrigerant | coolant flow adjacently on both sides of a heat exchanger plate, and heat exchange is performed.
In addition, since the direction of the flow of the refrigerant differs between the case where the heat exchange device 1 cools water and the case where water is heated, the ports through which other refrigerants pass are also described as inlets / outlets.

The compressor 41 is a so-called compressor. The compressor 41 compresses and sends out the refrigerant, and circulates the refrigerant between the air-cooled heat exchanger 10 and the water heat exchangers 20A and 20B. The compressor 41 can be of a scroll type, for example. The scroll method is a method of rotating the orbiting scroll by combining two cylindrical spiral blades of the fixed scroll and the orbiting scroll. As a result, the refrigerant sucked from the outer periphery is gradually compressed toward the center. However, the compressor 41 is not limited to this, and may be a rotary type that compresses by rotating a biased piston.
The compressor 41 is inverter-controlled, for example. Thereby, the rotation speed of the compressor 41 is adjusted and the delivery amount of the refrigerant is varied.

  The accumulator 42 separates and accumulates the refrigerant liquid that has not completely evaporated.

The four-way valve 43 switches the refrigerant passage (passing direction) between when the water is cooled by the refrigerant and when the water is heated.
As will be described in detail later, when the four-way valve 43 is in the state of the solid line in FIG. 1, the heat exchange device 1 cools the water. That is, when water is a high-temperature fluid and the refrigerant is a low-temperature fluid, the temperature of water is higher than the temperature of the refrigerant.
On the other hand, when the four-way valve 43 is in the state of the broken line in FIG. 1, the heat exchange device 1 heats water. That is, the water is a low-temperature fluid and the refrigerant is a high-temperature fluid, and the water temperature is lower than the refrigerant temperature.
The four-way valve 43 is switched between a solid line state and a broken line state.

  The expansion valves 44, 45A, 45B are, for example, electronic expansion valves. In this case, the opening degree of the valve can be adjusted by driving the pulse motor.

  A connection relationship of the refrigerant pipe 30 through which the refrigerant passes will be described. Below, the refrigerant | coolant piping 30 is divided | segmented for every place and it describes with the refrigerant | coolant piping 31 and 32 grade | etc.,. The state of the four-way valve 43 shown by the solid line in FIG. 1 is when the heat exchange device 1 cools the water. In this case, the connection relationship by the refrigerant pipe 30 will be described.

The outlet 41 a of the compressor 41 is connected to the inlet / outlet 43 a of the four-way valve 43 by the refrigerant pipe 31. The inlet / outlet 43 b of the four-way valve 43 is connected to the inlet / outlet 10 a of the air-cooled heat exchanger 10 through the refrigerant pipe 32. The inlet / outlet 10 b of the air-cooled heat exchanger 10 is connected to the expansion valve 44. The expansion valve 44 is connected to the refrigerant pipe 34c. The refrigerant pipe 34c branches into a refrigerant pipe 34a and a refrigerant pipe 34b, and the refrigerant pipe 34a is connected to the expansion valve 45A and the refrigerant pipe 34b is connected to the expansion valve 45B.
Here, when the refrigerant pipes 34a, 34b, and 34c are not distinguished from each other, they are referred to as refrigerant pipes 34 (in FIG. 1, they are referred to as refrigerant pipes 34a (34)).

The expansion valve 45A is connected to the refrigerant inlet / outlet 20Aa of the water heat exchanger 20A. On the other hand, the expansion valve 45B is connected to the refrigerant inlet / outlet 20Ba of the water heat exchanger 20B. The refrigerant inlet / outlet 20Ab of the water heat exchanger 20A is connected to the refrigerant pipe 35a. Similarly, the refrigerant inlet / outlet 20Bb of the water heat exchanger 20B is connected to the refrigerant pipe 35b. Then, the refrigerant pipes 35a and 35b merge with the refrigerant pipe 35c.
Here, when the refrigerant pipes 35a, 35b, and 35c are not distinguished from each other, they are represented as refrigerant pipes 35 (in FIG. 1, they are represented as refrigerant pipes 35a (35)).

  The refrigerant pipe 35 c is connected to the inlet / outlet 43 d of the four-way valve 43. The inlet / outlet 43 c of the four-way valve 43 is connected to the inlet of the accumulator 42 by the refrigerant pipe 36. The outlet of the accumulator 42 is connected to the inlet 41 b of the compressor 41 by the refrigerant pipe 37.

  Note that the expansion valve 45A side may be connected to the refrigerant inlet / outlet 20Ab of the water heat exchanger 20A, and the refrigerant pipe 35a may be connected to the refrigerant inlet / outlet 20Aa. The expansion valve 45B side may be connected to the refrigerant inlet / outlet 20Bb of the water heat exchanger 20B, and the refrigerant pipe 35b may be connected to the refrigerant inlet / outlet 20Ba. Further, only one of the water heat exchanger 20A and the water heat exchanger 20B may be changed in connection.

Next, the connection relationship of the water pipe 50 through which water passes will be described. The water heat exchangers 20A and 20B are connected by a water pipe 50 through which water passes. Here, the pipe through which water passes is referred to as a water pipe 50 as a whole. Individual pipes are referred to as water pipes 51 and 52.
First, the water pipe 51 is connected to the water inlet 20Ac of the water heat exchanger 20A. Then, one end of the water pipe 52 is connected to the water outlet 20Ad of the water heat exchanger 20A.
Next, the other end of the water pipe 52 is connected to the water inlet 20Bc of the water heat exchanger 20B. A water pipe 53 is connected to the water outlet 20Bd of the water heat exchanger 20B.

<Operation of Heat Exchanger 1>
An operation of the heat exchange device 1 when the heat exchange device 1 cools water, that is, when the temperature of water is higher than the temperature of the refrigerant will be described. In the water heat exchangers 20A and 20B, water is a high-temperature fluid and refrigerant is a low-temperature fluid. At this time, the four-way valve 43 is set so that the refrigerant passes through the path of the solid line in FIG. Then, the refrigerant flows as shown by solid arrows in FIG.
That is, when the heat exchange device 1 cools water, the refrigerant flows in the order of the compressor 41, the four-way valve 43, the air-cooled heat exchanger 10, and the expansion valve 44. Next, the refrigerant flows from the refrigerant pipe 34c connected to the expansion valve 44 through the refrigerant pipe 34a to the expansion valve 45A and the water heat exchanger 20A in this order. Then, the refrigerant pipe 35 a passes through the refrigerant pipe 35 c and returns to the compressor 41 via the four-way valve 43 and the accumulator 42.
Further, the refrigerant flows in order from the refrigerant pipe 34c connected to the expansion valve 44 through the refrigerant pipe 34b to the expansion valve 45B and the water heat exchanger 20B. Then, the refrigerant returns from the refrigerant pipe 35 b through the refrigerant pipe 35 c to the compressor 41 through the four-way valve 43 and the accumulator 42.
That is, the refrigerant flows in parallel (parallel) through the water heat exchanger 20A and the water heat exchanger 20B.

On the other hand, water is supplied from the water pipe 51 side and discharged to the water pipe 53 side through the water heat exchanger 20A, the water pipe 52, and the water heat exchanger 20B in this order. That is, water flows in series through the water heat exchanger 20A and the water heat exchanger 20B.
In the flow of water, the water heat exchanger 20A is on the upstream side, and the water heat exchanger 20B is on the downstream side.

  More specifically, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 41 and discharged from the outlet 41 a passes through the four-way valve 43 and is sent to the inlet / outlet 10 a of the air-cooled heat exchanger 10. As described above, when the heat exchange device 1 cools water, the air-cooled heat exchanger 10 serves as a condenser. Therefore, the refrigerant is heat-exchanged with air in the air-cooled heat exchanger 10 to be condensed and liquefied, and is discharged into the supercooled liquid from the inlet / outlet 10b of the air-cooled heat exchanger 10. The high-pressure liquid refrigerant discharged from the air-cooled heat exchanger 10 is decompressed by the expansion valve 44 and enters a gas-liquid two-phase state. The refrigerant in the gas-liquid two-phase state is further depressurized by the expansion valve 45A through the refrigerant pipe 34c and the refrigerant pipe 34a, and is sent to the water heat exchanger 20A. The refrigerant in the gas-liquid two-phase state is further depressurized by the expansion valve 45B from the refrigerant pipe 34c through the refrigerant pipe 34b, and sent to the water heat exchanger 20B. In this case, the water heat exchangers 20A and 20B function as an evaporator. Therefore, in the water heat exchangers 20A and 20B, the refrigerant exchanges heat with water and evaporates and becomes a low-pressure gas. The refrigerant discharged from the refrigerant inlet / outlet 20Ab of the water heat exchanger 20A is sent from the refrigerant pipe 35a to the four-way valve 43 through the refrigerant pipe 35c. The refrigerant discharged from the refrigerant inlet / outlet 20Bb of the water heat exchanger 20B is sent from the refrigerant pipe 35b to the four-way valve 43 through the refrigerant pipe 35c. The low-pressure gaseous refrigerant that has passed through the four-way valve 43 is sucked into the compressor 41 from the inlet 41b via the accumulator 42, and is compressed again. Then, the above operation is repeated.

  At this time, the water is cooled by the latent heat when the refrigerant evaporates in the water heat exchangers 20A and 20B.

Next, the operation of the heat exchange device 1 when the heat exchange device 1 heats water with a refrigerant, that is, when the temperature of the water is lower than the temperature of the refrigerant will be described. In the water heat exchangers 20A and 20B, water is a low-temperature fluid and the refrigerant is a high-temperature fluid. At this time, the four-way valve 43 is set so that the refrigerant passes through the path of the broken line in FIG. Then, the refrigerant flows as indicated by broken line arrows in FIG.
That is, when the heat exchange device 1 heats water, the refrigerant flows in the order of the compressor 41, the accumulator 42, and the four-way valve 43. The refrigerant flows from the refrigerant pipe 35c through the refrigerant pipe 35a in the order of the water heat exchanger 20A, the expansion valve 45A, and the refrigerant pipe 34a. The refrigerant flows from the refrigerant pipe 35c through the refrigerant pipe 35b in the order of the water heat exchanger 20B, the expansion valve 45B, and the refrigerant pipe 34b. Then, the refrigerant joins the refrigerant pipe 34 c, flows in order through the expansion valve 44, the air-cooled heat exchanger 10, and the four-way valve 43, and returns to the compressor 41 via the accumulator 42. Then, the above operation is repeated.
That is, even when the heat exchange device 1 heats water, the refrigerant flows in parallel (parallel) through the water heat exchanger 20A and the water heat exchanger 20B.

On the other hand, water is supplied from the water pipe 51 side and discharged to the water pipe 53 side through the water heat exchanger 20A, the water pipe 52, and the water heat exchanger 20B in this order. That is, water flows in series through the water heat exchanger 20A and the water heat exchanger 20B.
In the flow of water, the water heat exchanger 20A is on the upstream side, and the water heat exchanger 20B is on the downstream side.

  More specifically, the high-temperature and high-pressure gaseous refrigerant compressed by the compressor 41 and discharged from the outlet 41a passes through the four-way valve 43 and is sent in parallel to the water heat exchangers 20A and 20B. As described above, when the heat exchange device 1 heats water, the water heat exchangers 20A and 20B function as condensers. Therefore, the refrigerant exchanges heat with water in the water heat exchangers 20A and 20B, is condensed and liquefied, and becomes a supercooled liquid. Then, the refrigerant is discharged from the refrigerant inlet / outlet 20Aa of the water heat exchanger 20A to the expansion valve 45A. Similarly, the refrigerant is discharged from the refrigerant inlet / outlet 20Ba of the water heat exchanger 20B to the expansion valve 45B.

  The high-pressure liquid refrigerant discharged from the water heat exchangers 20A and 20B is decompressed by the expansion valves 45A and 45B to be in a gas-liquid two-phase state. The refrigerant that has passed through the expansion valve 45A is sent from the refrigerant pipe 34a to the refrigerant pipe 34c. Similarly, the refrigerant that has passed through the expansion valve 45B is sent from the refrigerant pipe 34b to the refrigerant pipe 34c. In other words, the refrigerant that has passed through the refrigerant pipe 34a and the refrigerant that has passed through the refrigerant pipe 34b merge at the refrigerant pipe 34c. Thereafter, the refrigerant is further decompressed by the expansion valve 44 and sent to the inlet / outlet 10 b of the air-cooled heat exchanger 10. In this case, the air-cooled heat exchanger 10 serves as an evaporator. Therefore, the refrigerant is evaporated and evaporated in the air-cooled heat exchanger 10 by exchanging heat with air. The low-pressure gaseous refrigerant discharged from the inlet / outlet 10a of the air-cooled heat exchanger 10 is sucked into the compressor 41 from the inlet 41b via the accumulator 42 and compressed again. Then, the above operation is repeated.

  At this time, water is heated by the high-temperature and high-pressure gaseous refrigerant in the water heat exchangers 20A and 20B.

FIG. 2 is a diagram illustrating an example of the heat exchange device 2 to which the first embodiment is not applied.
In the heat exchange device 1 to which the first embodiment is applied, a plurality of water heat exchangers 20 are provided. The refrigerant passed through the plurality of water heat exchangers 20 in parallel (in parallel), and the water passed through the plurality of water heat exchangers 20 in series.
The heat exchange device 2 to which the first embodiment shown in FIG. 2 is not applied includes one water heat exchanger 20 and one expansion valve 45. Therefore, the symbols A and B are omitted for the water heat exchanger 20 and the expansion valve 45. Other configurations are the same as those of the heat exchanging apparatus 1 to which the first embodiment shown in FIG. 1 is applied.

  When the water heat exchanger 20 is a plate heat exchanger, a heat transfer area (number of heat transfer plates) corresponding to the heat transfer amount is required to secure a predetermined heat transfer amount. That is, when a plurality of water heat exchangers 20 are provided, the total heat transfer area is the same as or close to the number when the water heat exchanger 20 is not divided.

  However, in the heat exchange device 1 to which the first embodiment shown in FIG. 1 is applied, the heat transfer area corresponding to the heat transfer amount is apportioned by the water heat exchangers 20A and 20B. For this reason, since the number of stacked heat transfer plates of each of the water heat exchangers 20A and 20B is reduced, the distribution of the refrigerant in the heat transfer plate stacking direction becomes uniform. For this reason, the heat transfer coefficient (heat transfer coefficient) on the refrigerant side is increased (improved).

Moreover, in the heat exchange apparatus 1, it is also considered that water is allowed to flow in parallel (parallel) with respect to the water heat exchangers 20A and 20B. However, when the discharge amount per unit time of water discharged from the heat exchange device 1 is set to a predetermined value, the flow rate of water when flowing in series is larger than when flowing in parallel. . That is, water is pumped. Therefore, the heat transfer coefficient (heat transfer coefficient) on the liquid side increases (is improved).
As described above, in the heat exchange device 1 to which the first embodiment is applied, the refrigerant is caused to flow in parallel (parallel) to the plurality of water heat exchangers 20 and the water is caused to flow in series. From this, the heat exchange apparatus 1 to which the first embodiment is applied has an improved overall heat transfer coefficient compared to the heat exchange apparatus 2. Thereby, the efficiency of heat exchange in the heat exchange device 1 is improved.

The water passes through the upstream water heat exchanger 20A and then passes through the downstream water heat exchanger 20B. Therefore, there is a difference between the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B. Therefore, expansion valves 45A and 45B are provided in the upstream water heat exchanger 20A and the downstream water heat exchanger 20B, respectively, and the refrigerant inlet / outlet 20Ab of the water heat exchanger 20A and the refrigerant inlet of the water heat exchanger 20B are provided. It must be controlled so that the temperature of the refrigerant discharged from the outlet 20Bb is the same (equal) or the difference is small.
That is, since the heat transfer amount of the upstream water heat exchanger 20A is larger than the heat transfer amount of the downstream water heat exchanger 20B, it is necessary to open the expansion valve 45A so that a large amount of refrigerant flows. On the other hand, since the heat transfer amount of the downstream water heat exchanger 20B is smaller than the heat transfer amount of the upstream water heat exchanger 20A, the expansion valve 45B must be opened small to allow a small amount of refrigerant to flow. By doing in this way, the temperature of the refrigerant discharged from the upstream water heat exchanger 20A and the temperature of the refrigerant discharged from the downstream water heat exchanger 20B are the same (equal) or the difference is suppressed. The

  Therefore, expansion valves 45A and 45B are provided in the water heat exchanger 20A and the water heat exchanger 20B. By adjusting the opening degree of the expansion valves 45A and 45B, it is possible to suppress a difference between the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B (occurrence of difference). doing. By doing so, the difference between the temperature of the refrigerant discharged from the refrigerant inlet / outlet 20Ab of the upstream water heat exchanger 20A and the temperature of the refrigerant discharged from the refrigerant inlet / outlet 20Bb of the downstream water heat exchanger 20B is made. Is suppressed from occurring. The heat transfer amount of the water heat exchanger 20A and the water heat exchanger 20B is the difference between the temperature of the refrigerant discharged from the upstream water heat exchanger 20A and the temperature of the refrigerant discharged from the downstream water heat exchanger 20B. It suffices if it is set within a range in which is suppressed.

  The opening degree of the expansion valves 45A and 45B is controlled by program control using a control circuit (not shown) equipped with a CPU or the like while detecting the temperature of the refrigerant discharged from the water heat exchangers 20A and 20B. Also good.

[Second Embodiment]
In the heat exchange device 1 to which the first embodiment shown in FIG. 1 is applied, water is configured to pass through the water heat exchangers 20A and 20B in the water heat exchanger 20 in series.
In the heat exchange device 1 to which the second embodiment is applied, water is configured to be able to bypass the upstream water heat exchanger 20A.
FIG. 3 is a diagram illustrating an example of the heat exchange device 1 to which the second exemplary embodiment is applied.
Below, a different part from the heat exchange apparatus 1 with which 1st Embodiment shown in FIG. 1 is applied is demonstrated, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 3, in the heat exchange device 1 to which the second embodiment is applied, the water in the water heat exchanger 20A in the heat exchange device 1 to which the first embodiment shown in FIG. 1 is applied. The water pipe 52 between the outlet 20Ad and the water inlet 20Bc of the water heat exchanger 20B is divided into a water pipe 52a and a water pipe 52b. And the three-way valve 61 is provided in the divided | segmented part. Then, a water pipe 54 branched from the water pipe 51 connected to the water inlet 20Ac of the water heat exchanger 20A and connected to the three-way valve 61 is provided.
That is, when the flow path of the three-way valve 61 is set as indicated by an arrow I, water is supplied to the upstream side water heat exchanger 20A and the downstream side, similarly to the heat exchange device 1 to which the first embodiment is applied. It flows in series with the water heat exchanger 20B. On the other hand, when the flow path of the three-way valve 61 is set as indicated by the arrow II, water bypasses the upstream water heat exchanger 20A and flows only through the downstream water heat exchanger 20B.
Here, the flow path indicated by the arrow II passing through the water pipe 54 and the three-way valve 61 is an example of a bypass flow path.

  Then, the water is pumped by a pump 60 connected to the water pipe 51. The pump 60 may be a pump driven by an inverter type motor. If the pump is driven by an inverter type motor, the pump can be moved according to the amount of water.

Next, the operation of the heat exchange device 1 to which the second exemplary embodiment is applied will be described.
Consider the case of cooling water. In this case, when the temperature of the supplied water and the temperature of the discharged water are small, it is not necessary to fully operate the heat exchange device 1 (hereinafter referred to as a partial load case). There is. In the case of such a partial load, the three-way valve 61 is operated so that water flows through the flow path II. Thereby, water detours (bypasses) the water heat exchanger 20A and flows to the water heat exchanger 20B.
Then, the opening of the expansion valve 45A is set to “0” (closed) so that the refrigerant does not flow to the water heat exchanger 20A, and heat exchange by the water heat exchanger 20A is stopped.

  Further, since the water bypasses the water heat exchanger 20A and flows only to the water heat exchanger 20B, the flow rate of water becomes large unless the water discharge force by the pump 60 is adjusted. Therefore, the motor that drives the pump 60 is, for example, an inverter system, and the number of rotations of the pump 60 is controlled so that the flow rate of water is the same as when passing through the water heat exchanger 20A and the water heat exchanger 20B. preferable.

Thus, the power consumption of the pump 60 is reduced by reducing the power of the pump 60.
The three-way valve 61, the expansion valve 45A, and the pump 60 may be program-controlled by a control circuit (not shown) that includes a CPU and the like.

  Here, the three-way valve 61 switches between the flow path I and the flow path II, but the flow rate between the flow path I and the flow path II may be adjusted. That is, the amount of water flowing through the flow channel I, that is, the amount of water flowing through the hydrothermal exchanger 20A may be adjusted according to the amount of water flowing through the flow channel II.

Here, the upstream side water heat exchanger 20A is bypassed (bypassed), but the downstream side water heat exchanger 20B may be bypassed (bypassed).
Furthermore, the number of the water heat exchangers 20 may exceed two, and each or some of them may be bypassed.

[Third Embodiment]
In the heat exchange device 1 to which the first embodiment and the second embodiment are applied, each of the plurality of water heat exchangers 20 includes the expansion valve 45. And the opening degree of each expansion valve 45 was set so that the difference in the temperature of the refrigerant | coolant discharged from the some water heat exchanger 20 might be suppressed.

This is because water flows in series between the water heat exchanger 20A on the upstream side of the water heat exchanger 20 and the water heat exchanger 20B on the downstream side. This is because the upstream water heat exchanger 20A and the downstream water heat exchanger 20B are plate-type water heat exchangers having the same (equal) heat transfer area (the number of heat transfer plates).
That is, when the heat exchanger 1 cools the water, as described above, the upstream-side water heat exchanger 20A and the downstream-side water heat exchanger 20B have the same number of heat transfer plates as plate type water heat exchange. If it is a heat exchanger, there will be a difference between the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B. Therefore, expansion valves 45A and 45B are provided in the upstream water heat exchanger 20A and the downstream water heat exchanger 20B, respectively, and the refrigerant inlet / outlet 20Ab of the water heat exchanger 20A and the refrigerant inlet of the water heat exchanger 20B are provided. The temperature of the refrigerant discharged from the outlet 20Bb was controlled to be the same or small.

  However, if the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B are the same (equal) or the difference is small, the expansion valve provided in the upstream water heat exchanger 20A The opening degree of 45A and the opening degree of the expansion valve 45B provided in the downstream water heat exchanger 20B are the same or the difference is small. In such a case, the expansion valves 45A and 45B of the upstream water heat exchanger 20A and the downstream water heat exchanger 20B can be integrated.

FIG. 4 is a diagram illustrating an example of the heat exchange device 1 to which the third exemplary embodiment is applied.
In the heat exchange device 1 to which the third embodiment is applied, the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B are set to be the same (equal) or the difference is set small. doing. For example, when the water heat exchangers 20A and 20B are plate heat exchangers, the amount of heat transfer is set by the heat transfer area (the number of heat transfer plates). Accordingly, the heat transfer areas of the water heat exchangers 20A and 20B are set so that the heat transfer amount is the same (equal) or the difference is reduced. For example, the heat transfer area ratio between the upstream water heat exchanger 20A and the downstream water heat exchanger 20B is about 1: 1.8.
An expansion valve 45 is provided in common for the water heat exchanger 20A and the water heat exchanger 20B.
Here, the expansion valve 45 is an example of an expansion mechanism.

In the heat exchange device 1 to which the third embodiment is applied, the heat transfer amount of the upstream water heat exchanger 20A and the heat transfer amount of the downstream water heat exchanger 20B are set to be the same (equal) or the difference is set small. doing. Therefore, the temperature of the refrigerant discharged from the refrigerant inlet / outlet 20Aa of the upstream water heat exchanger 20A and the temperature of the refrigerant discharged from the refrigerant inlet / outlet 20Ba of the downstream water heat exchanger 20B are the same or small.
Therefore, it is not necessary to provide the expansion valves (expansion valves 45A and 45B in FIGS. 1 and 3) in each of the upstream water heat exchanger 20A and the downstream water heat exchanger 20B. That is, the expansion valve 45 may be provided in common for the water heat exchanger 20A and the water heat exchanger 20B.

  The heat transfer amount (heat transfer area) of the water heat exchanger 20A and the water heat exchanger 20B is the refrigerant inlet / outlet 20Ab of the upstream water heat exchanger 20A and the refrigerant inlet / outlet 20Bb of the downstream water heat exchanger 20B. May be set in a range in which the difference in the temperature of the refrigerant discharged from is suppressed.

  When the water heat exchangers 20A and 20B are plate heat exchangers, the heat transfer amount (heat transfer area) is set by the number of heat transfer plates. Therefore, the heat transfer amount of the water heat exchangers 20A and 20B can be easily set.

[Fourth Embodiment]
In the first to third embodiments, the heat exchange device 1 is used alone (one unit). However, when the amount of water to be cooled or heated is large, the corresponding heat exchange device 1 is required. Here, it respond | corresponds by arrange | positioning the several heat exchange apparatus 1 in parallel.

FIG. 5 is a diagram illustrating an example of a heat exchange system 80 in which a plurality of heat exchange devices 1 are operated in parallel. The heat exchange system 80 in FIG. 5 includes a plurality (four in FIG. 5) of heat exchange apparatuses 1 to which the first embodiment is applied. These heat exchange devices 1 are connected in parallel between the water supply pipe 70A and the discharge pipe 70B. These heat exchange devices 1 operate in parallel.
Since the operation of each heat exchange device 1 has been described in the first embodiment, the description thereof is omitted.

  In FIG. 5, the heat exchange device 1 is the heat exchange device 1 to which the first embodiment is applied, but the heat exchange device 1 to which the second embodiment is applied or the third embodiment. It is good also as the heat exchange apparatus 1 with which embodiment is applied.

[Fifth Embodiment]
The heat exchange device 1 to which the fifth embodiment is applied includes two housings.
FIG. 6 is a diagram illustrating an appearance of an example of the heat exchange device 1 to which the fifth embodiment is applied. The heat exchange device 1 includes two casings 101 and 102. The two casings 101 and 102 are installed side by side. Each of the casings 101 and 102 includes casing panels 101a and 102a that can be opened and closed for maintenance. The casing panels 101a and 102a are provided on the front side in the same direction of the casings 101 and 102 arranged side by side. And on the upper side of the housing | casing 101,102, the fans 11A and 11B with which the heat exchange apparatus 1 is displayed are displayed. An air-cooled heat exchanger 10B is displayed on the rear side of the casings 101 and 102 through a ventilation grid (grill). The fans 11A and 11B and the air-cooled heat exchanger 10B will be described later.
Maintenance (maintenance) of the casings 101 and 102 is performed by opening the casing panels 101a and 102a, and is concentrated in one direction indicated by an arrow.
Note that the casing 101 is an example of a first casing, and the casing 102 is an example of a second casing.

  Moreover, since the heat exchange apparatus 1 is divided and accommodated in two housings 101 and 102 arranged side by side, the height dimension can be kept low. Each of the casings 101 and 102 has a smaller volume (compact) than the case where the casing 101 and the casing 102 are combined. Therefore, it is easy to carry and install.

FIG. 7 is a diagram illustrating an example of the heat exchange device 1 to which the fifth exemplary embodiment is applied. FIG. 7 is a view of the inside of the casings 101 and 102 of the heat exchange device 1 from above.
The heat exchange device 1 is divided and accommodated in two housings 101 and 102. The heat exchanging device 1 has a configuration in which the heat exchanging device 1 to which the first embodiment shown in FIG. 1 is applied further includes housings 101 and 102.
The casing 101 is a portion including the water heat exchangers 20A and 20B, the pump 60, and the water pipe 50 (the water pipes 51, 52, and 53 shown in FIG. 1) of the heat exchange device 1, that is, water flows (deliver water). ) Part (herein referred to as the water circuit 110) is accommodated. The pump 60 is the pump 60 described in the heat exchange device 1 to which the second embodiment shown in FIG. 3 is applied, and is connected to the water pipe 51 of FIG.
The water circuit 110 includes a power control unit 111 that controls the power of the water circuit 110.
The water pipe 50 is an example of a liquid pipe, and the water circuit 110 is an example of a liquid circuit.

On the other hand, the housing 102 accommodates a part including the compressor 41, the accumulator 42, and the four-way valve 43 of the heat exchange device 1, that is, a part of a part through which the refrigerant flows (deliver refrigerant). As will be described later, the refrigerant is supplied to the casing 101 via the refrigerant pipe 30 (for example, the refrigerant pipes 34 and 35 shown in FIG. 1). For this reason, the housing | casing 102 accommodates a part of part through which a refrigerant | coolant flows. Here, a part of a portion through which the refrigerant accommodated in the housing 102 flows is denoted as a refrigerant circuit 120.
The refrigerant circuit 120 includes a power control unit 121 that controls the power of the refrigerant circuit 120.
The four-way valve 43 is an example of a multi-way valve.

  Each of the casings 101 and 102 includes air-cooled heat exchangers 10A and 10B. The air-cooled heat exchanger 10A and the air-cooled heat exchanger 10B function as the air-cooled heat exchanger 10 shown in FIG. Then, fans 11A and 11B corresponding to the air-cooled heat exchangers 10A and 10B are provided (see FIG. 6). The fan 11A and the fan 11B function as the fan 11 shown in FIG.

  The expansion valve 44 and the expansion valves 45A and 45B of the heat exchange device 1 may be accommodated in either the housing 101 or the housing 102.

  The heat exchange device 1 is connected between the casing 101 and the casing 102 by a refrigerant pipe 30 (for example, the refrigerant pipes 34 and 35 in FIG. 1). Therefore, even if the heat exchange device 1 is divided into the housing 101 and the housing 102, it is possible to prevent the assembly (installation) from being complicated and the assembly (installation) from taking time.

  Further, a power control unit 111 that controls the power of the water circuit 110 is provided in the housing 101, and a power control unit 121 that controls the power of the refrigerant circuit 120 is provided in the housing 102. Therefore, maintenance (maintenance) of the water circuit 110 can be performed in the housing 101. Similarly, maintenance (maintenance) of the refrigerant circuit 120 can be performed in the housing 102. That is, it is not necessary to perform maintenance across the casing 101 and the casing 102. Therefore, ease of maintenance (maintenability) is good.

If the operation direction of the power control panel provided in each of the power control units 111 and 121 is arranged toward the housing panels 101a and 102a of the housings 101 and 102, the operation becomes easy.
Furthermore, maintenance (maintenance) is further facilitated by arranging the fitting flanges of the water pipe 50 of the water circuit 110 and the refrigerant pipe 30 of the refrigerant circuit 120 close to the casing panels 101a and 102a of the casings 101 and 102. become.
That is, the maintenance direction (maintenance direction) is concentrated in one direction on the casing panels 101a and 102a side of the casings 101 and 102, thereby improving the ease of maintenance (maintenability).

  By dividing the air-cooled heat exchanger 10 that is the dominant factor in the overall dimensions of the housing into an air-cooled heat exchanger 10A and an air-cooled heat exchanger 10B, air-cooled heat exchange is performed on either of the housings. Compared with the case where the vessel 10 is provided, the volume of the heat exchange device 1 is reduced (compact).

  FIG. 8 is a diagram illustrating an example of a modification of the heat exchange device 1 to which the fifth embodiment is applied. Here, the housing 101 does not include the pump 60 shown in FIG. When the pump 60 is provided outside the heat exchange device 1, it is not necessary to incorporate the pump 60 in the housing 101.

  In the above, the heat exchange device housed in the casings 101 and 102 of the heat exchange device 1 to which the fifth embodiment is applied is the heat exchange device 1 to which the first embodiment is applied. However, the heat exchange apparatus 1 to which the second embodiment or the third embodiment is applied may be used.

DESCRIPTION OF SYMBOLS 1 ... Heat exchange apparatus, 10, 10A, 10B ... Air-cooled heat exchanger, 11, 11A, 11B ... Fan, 20, 20A, 20B ... Water heat exchanger, 30, 31, 32, 33, 34, 35, 36 37 ... Refrigerant piping, 41 ... Compressor, 42 ... Accumulator, 43 ... Four-way valve, 44, 45, 45A, 45B ... Expansion valve, 50, 51, 52, 53, 54 ... Water piping, 60 ... Pump, 61 ... Three-way valve, 70A ... Water supply pipe, 70B ... Discharge pipe, 80 ... Heat exchange system, 101, 102 ... Housing, 110 ... Water circuit, 111, 121 ... Power control unit, 120 ... Refrigerant circuit

Claims (10)

A first heat exchanger that exchanges heat between the refrigerant and air or liquid;
A plurality of second heat exchangers for exchanging heat between the refrigerant and the liquid;
A compressor for compressing the refrigerant;
A plurality of expansion mechanisms that are provided in each of the plurality of second heat exchangers and expand the refrigerant compressed by the compressor;
In the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series.   The plurality of expansion mechanisms provided in each of the plurality of second heat exchangers are set so as to suppress the occurrence of a difference in temperature of the refrigerant discharged from each of the plurality of second heat exchangers. The heat exchange device according to claim 1, wherein:   The heat exchange apparatus according to claim 1, further comprising a bypass flow path in which the liquid flows around at least one of the plurality of second heat exchangers. A first heat exchanger that exchanges heat between the refrigerant and air or liquid;
A plurality of second heat exchangers for exchanging heat between the refrigerant and the liquid;
A compressor for compressing the refrigerant;
An expansion mechanism that is provided in common to the plurality of second heat exchangers and expands the refrigerant compressed by the compressor,
In the plurality of second heat exchangers, the refrigerant flows in parallel, the liquid flows in series,
The plurality of second heat exchangers are set to have different heat transfer areas.   The heat transfer area of each of the plurality of second heat exchangers is set so as to suppress occurrence of a difference in heat transfer amount between the plurality of second heat exchangers. 4. The heat exchange device according to 4. A first housing and a second housing;
Two first heat exchangers for exchanging heat between the refrigerant and air or liquid;
A compressor for compressing the refrigerant;
An accumulator for accumulating refrigerant;
A multi-way valve that switches the passage direction of the refrigerant;
Refrigerant piping for delivering refrigerant;
A second heat exchanger that exchanges heat between the refrigerant and the liquid;
A liquid pipe for delivering the liquid,
The first housing contains a liquid circuit through which a liquid flows, including at least the second heat exchanger and the liquid pipe,
The second housing contains at least the compressor, the accumulator, the multi-way valve, and the refrigerant pipe, and contains a refrigerant circuit through which a refrigerant flows,
The heat exchange apparatus, wherein the first housing and the second housing accommodate each of the two first heat exchangers. The first casing includes a casing panel that can be opened and closed,
An operation direction of a power control panel for controlling the power of a coupling flange of the liquid pipe and the second heat exchanger housed in the first casing is provided on the casing panel side. Item 7. The heat exchange device according to Item 6. The second heat exchanger housed in the first housing is plural,
A plurality of expansion mechanisms which are provided in each of the plurality of second heat exchangers and expand the refrigerant compressed by the compressor;
The heat exchanger according to claim 6 or 7, wherein in the plurality of second heat exchangers, the refrigerant flows in parallel and the liquid flows in series.   The heat exchange apparatus according to claim 8, further comprising a bypass flow path in which the liquid flows around at least one of the plurality of second heat exchangers. The second heat exchanger housed in the first housing is plural,
An expansion mechanism that is provided in common for the plurality of second heat exchangers and expands the refrigerant compressed by the compressor;
In the plurality of second heat exchangers, the refrigerant flows in parallel, the liquid flows in series,
The heat exchange apparatus according to claim 6 or 7, wherein the plurality of second heat exchangers are set so as to have different heat transfer areas.

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