WO2012073746A1

WO2012073746A1 - Integrated air-conditioning system, and internal air unit, external air unit, and laminated body, thereof

Info

Publication number: WO2012073746A1
Application number: PCT/JP2011/076841
Authority: WO
Inventors: 高橋　正樹; 裕一郎峰岸; 大賀　俊輔
Original assignee: 富士電機株式会社
Priority date: 2010-11-30
Filing date: 2011-11-21
Publication date: 2012-06-07
Also published as: CN103140718A; JPWO2012073746A1; US20130213071A1

Abstract

An integrated air-conditioning system (50) in which an internal air unit (60) and an external air unit (70) are connected with a wall (1) therebetween, has an integrated structure comprising both: a structure as an indirect external air cooling machine (liquid-gas heat exchangers (61b, 71b), pipes (51), etc.); and a structure as a general air-conditioning machine (evaporator (61a), expansion valve (54), compressor (55), condenser (71b), etc.).

Description

Integrated air conditioning system, its inside air unit, outside air unit, laminate

The present invention relates to an air conditioning system.

Conventionally, for example, a large number of servers and the like are installed in a data center or a server room of a company. In such a server room or the like, the room temperature rises due to the heat generated by a large number of servers. For this reason, an air conditioning system that keeps the temperature of the entire room constant is adopted for the server room. In addition, such an air conditioning system is almost always operated, and is operated even in winter.

In such a conventional air conditioning system for server rooms, etc., in order to stabilize the room temperature of the server room, low temperature air (cold air) blown out from the air conditioner and supplied into the server room contacts the servers in the server rack. While flowing, cool the server. The air (warm air) heated by the heat of the server is returned from the server room into the air conditioner, cooled by the air conditioner, blown out as the cold air, and supplied again to the server room. The circulation method is taken.

Further, for example, air conditioners described in Patent Documents 1, 2, 3 and the like are known.
The inventions described in these Patent Documents 1, 2, 3 and the like all relate to an air conditioner for a high heat generating device that needs to be cooled even when the outside air temperature is low, and in particular, the outside air temperature is used to cool the room. It relates to air conditioners.

The air conditioners of Patent Documents 1, 2, and 3 have substantially the same basic configuration, and include a refrigerant circuit in which a refrigerant pump, an expansion valve, an evaporator, a compressor, and a condenser are connected in order. In this refrigerant circuit, it is possible to realize a compression cycle in which the compressor is operated to cool the room, and a refrigerant pump cycle in which the refrigerant pump is operated to cool the room without operating the compressor. Usually, the compressor and the refrigerant pump are not operated simultaneously. Basically, when the outside air temperature is low, the refrigerant pump cycle is used, and when the outside temperature is high, the compressor cycle is used.

The compression cycle is a general compression refrigeration cycle (such as a vapor compression refrigeration cycle) of “evaporator → compressor → condenser → expansion valve → evaporator”. In the refrigerant pump cycle, the gas refrigerant exiting the evaporator is sent to the condenser as it is, cooled in the condenser with low-temperature outside air, liquefied, and sent to the refrigerant pump. The liquid refrigerant is pressurized by the refrigerant pump and guided to the evaporator. Cooling the refrigerant with such outside air and cooling the room with the cooled refrigerant is called indirect outside air cooling or the like.

In the invention of Patent Document 1, for example, the above two cycles are switched by comparing the outside air temperature with set values T1, T2, T3 (T3> T2> T1). Thereby, the switching operation of both cycles can be performed so that the energy consumption is reduced as a whole.

Further, in the invention of Patent Document 2, when the amount of air blown from the outdoor blower is maximum and the room temperature is equal to or higher than a predetermined value, the operation is switched from the refrigerant pump cycle to the compression cycle.

Further, in the invention of Patent Document 3, when the flow rate of the liquid refrigerant becomes equal to or less than a certain value during the operation by the indirect outside air cooling cycle, the input amount of the refrigerant pumping means, the air volume of the indoor fan, the air volume of the outdoor fan, Control means for controlling at least one of the valve openings of the expansion valve is provided. Then, the control means changes the cooling cycle from the indirect outside air cooling cycle to the vapor compression cooling cycle when the number of times that the flow rate of the liquid refrigerant has become a predetermined value or less exceeds the predetermined number of times within a predetermined time. .

Japanese Patent No. 3996733 Japanese Patent No. 399825 Japanese Patent No. 4145632

Here, FIG. 4 shows an example of a conventional indirect outdoor air cooling system.
In FIG. 4, the indirect outside air cooling system is a cooling system that cools an arbitrary indoor space, and is a system that uses outside air for cooling without flowing the outside air into the indoor space. This indoor space is, for example, a server room in which a large number of server racks 102 mounted with heating elements 101 such as server devices (computer devices) are installed. Such an indoor space has a large amount of heat generated by the large number of heating elements 101 and needs to be cooled even in winter.

In this example, the indoor space is divided into a server installation space, an underfloor space, and a ceiling space. Among these, the server installation space is a space in which the server rack 102 on which the heating element 101 is mounted is installed. The upper side of the server installation space has a ceiling and the lower side has a floor. The space above the ceiling is the above-described ceiling space, and the space below the floor is the below-floor space. Naturally, holes are opened in the floor and ceiling, and cold air and warm air flow into and out of the server installation space through the holes.

The indirect outside air cooling system shown in the figure cools the return air (warm air) from, for example, a server room with a general air conditioner, but energy is saved by lowering the temperature of the return air using the outside air at the preceding stage. Is intended.

Here, the air conditioner 110 including the illustrated refrigerator 111, air handling unit 112, expansion valve 113, refrigerant pipe 114 and the like is an existing general air conditioner. That is, this air conditioner 110 performs cooling with a general compression refrigeration cycle (vapor compression refrigeration cycle or the like) of “evaporator → compressor → condenser → expansion valve → evaporator” using a refrigerant. Air conditioner (air conditioner etc.).

The refrigerant circulates through the refrigerant pipe 114, the refrigerator 111, the air handling unit 112, the expansion valve 113, and the like. The refrigerator 111 has a compressor, a condenser, a fan (blower), and the like. The air handling unit 112 includes an evaporator, a fan (blower), and the like.

The air handling unit 112 sends cool air to the under floor space in the room and supplies the cool air to the server installation space through the under floor space. This cool air becomes warm air by cooling the heating element 101, and this warm air flows from the server installation space into the ceiling space. In the case of a normal cooling system, this warm air flows from the ceiling space into the air handling unit 112 through a duct or the like. The air handling unit 112 generates the cold air by cooling the incoming warm air with the evaporator.

Here, the air handling unit 112 cools the inflowing warm air so that the temperature of the cool air becomes a predetermined value (set value). Naturally, the higher the temperature of the inflowing warm air, the higher the load required for cooling. As a result, power consumption increases. Therefore, for the purpose of energy saving, the illustrated indirect outside air cooler 120 is provided in order to lower the temperature of the warm air flowing into the air handling unit 112.

The wall 1 shown in the figure is a wall of an arbitrary building, and the wall 1 is divided into the inside and outside of the building with the wall 1 as a boundary. In the building, not only the indoor space in which the server or the like is installed but also the air handling unit 112 or the like (in the illustrated example, the space adjacent to the indoor space, for example, sometimes called a machine room) ) The air (inside air) in the building circulates in the building while repeating the cold and warm air states. If the temperature of the air outside the building (outside air) is a season other than summer, for example, it may be considered that it is lower than the temperature of the warm air inside air.

The indirect outside air cooler 120 includes a heat exchanger 121, a blower 122, a blower 123, an inside air duct 124, an outside air duct 125, and the like. One end of the inside air duct 124 is provided on the ceiling space side and the other end is provided on the air handling unit 112 side, and is connected to the heat exchanger 121 on the way. The warm air on the ceiling space side is caused to flow into the inside air duct 124 and discharged to the air handling unit 112 side by the blower 122, but passes through the heat exchanger 121 on the way.

Further, holes are made in two arbitrary locations on the wall 1 (one is referred to as the outside air inflow hole 126 and the other is referred to as the outside air discharge hole 127), and one end of the outside air duct 125 is connected to the outside air inflow hole 126, The other end is connected to the outside air discharge hole 127. The outside air duct 125 is connected to the heat exchanger 121 on the way. The outside air is passed through the outside air duct 125 by the blower 123. That is, outside air flows in from the outside air inflow hole 126 and is discharged from the outside air discharge hole 127, but the outside air passes through the heat exchanger 121 on the way.

As described above, the inside air (warm air) and the outside air pass through the heat exchanger 121, and heat exchange between the inside air (warm air) and the outside air is performed in the heat exchanger 121. In addition, according to this heat exchanger 121, since the outside air is shut off from the inside air to perform heat exchange, the outside air humidity, dust, and corrosive gas contained in the outside air are not taken into the room. Sex is maintained. In addition, such a heat exchanger 121 is an existing one, and a detailed configuration is not particularly shown.

If the temperature of the inside air decreases due to heat exchange in the heat exchanger 121, the temperature of the warm air flowing into the air handling unit 112 decreases, and the power consumption of the air conditioner 110 is reduced (the energy saving effect is reduced). can get). In addition, you may consider that the electric power consumption by the air blower 122 and the air blower 123 is comparatively small.

Basically, only when “the temperature of the inside air (warm air)> the temperature of the outside air”, the inside air is cooled by the outside air, and the temperature of the inside air (warm air) is lowered. Therefore, in a situation where the outside air temperature is low as in winter, the effect of cooling the inside air (warm air) by the heat exchanger 121 is high, and thereby the energy saving effect of the air conditioner 110 is high. On the other hand, in the summer, there is a possibility that the effect of cooling the inside air by the heat exchanger 121 is small, ineffective, or counterproductive.

As described above, in the conventional indirect outside air cooling system, the indirect outside air cooler 120 is newly added to the existing general air conditioner 110, and the installation space increases accordingly. Furthermore, although simplified in the drawing, the ducts (the inside air duct 124 and the outside air duct 125) actually take a large installation space. Moreover, as mentioned above, although it is comparatively small, the power consumption by the air blower 122 and the air blower 123 is added. In addition, the indirect outside air cooler 120 as shown in FIG. 4 takes time and costs for installation work.

The main subject of the present invention is to provide a compact integrated air conditioning system.
The integrated air conditioning system of the present invention has the following configuration.
First, schematically, the integrated air conditioning system of the present invention includes an inside air unit through which inside air passes and an outside air unit through which outside air passes.

The inside air unit includes a first heat exchanger, an evaporator, and a first blower for allowing the inside air to pass through the first heat exchanger and the evaporator.
The outside air unit includes a second heat exchanger, a condenser, and a second blower for allowing the outside air to pass through the second heat exchanger and the condenser.

Then, refrigerant piping connected to the evaporator, the condenser, an expansion valve provided in any of the outside air unit and the inside air unit, and a compressor provided in any of the outside air unit and the inside air unit And an air conditioner using a compression refrigeration cycle is configured by circulating refrigerant through the refrigerant pipe to the evaporator, the condenser, the expansion valve, and the compressor.

Further, a liquid pipe connected to the first heat exchanger and the second heat exchanger is provided, and an arbitrary fluid is supplied to the first heat exchanger and the second heat exchanger via the liquid pipe. The fluid is circulated and heat is exchanged between the fluid and the outside air in the second heat exchanger to cool the fluid with the outside air, and the cooled fluid and the inside air are cooled with the first heat exchanger. An indirect outside air cooler that cools the inside air with the fluid by heat exchange is configured.

The integrated air conditioning system is configured to include both an indirect outside air cooling function for lowering the inside air temperature using outside air and a general air conditioning function using a compression refrigeration cycle by the inside air unit and the outside air unit.

In the integrated air conditioning system, for example, in the inside air unit, the first heat exchanger, the evaporator, and the first blower are stacked and integrated to form a first stacked body. It may be.

In the integrated air conditioning system, for example, in the outside air unit, the second heat exchanger, the condenser, and the second blower are stacked and integrated to form a second stacked body. It may be.

It is a block diagram of the air conditioning system (indirect external air cooling system) of Example 1. FIG. It is a block diagram of the air conditioning system (integrated air conditioning system) of Example 2. FIG. 3 is an enlarged view of a part of the configuration of FIG. 2. It is a block diagram of the conventional indirect outside air cooling system.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of an air conditioning system (indirect outside air cooling system) according to a first embodiment.
In FIG. 1, the space to be cooled by the indirect outside air cooling system is assumed to be the same as the conventional example shown in FIG. That is, the indoor space to be cooled is, for example, a server room in which a large number of server racks 102 on which heating elements 101 such as server devices (computer devices) are mounted are installed. In this example, the indoor space is divided into a server installation space, an underfloor space, and a ceiling space as shown in FIG. Of course, although not limited to this example, this example is used in this description. In this example, the cooling target can be regarded as a server installation space in a narrow sense.

As in the example of FIG. 4, the wall 1 separates the inside of the building from the outside of the building, and the air inside the building (inside air) circulates while repeating a cold air state and a warm air state. In this description, basically, the temperature of the air outside the building (outside air) is assumed to be lower than the temperature of the warm air inside air.

There are not only the indoor space but also the machine room in the building. As described above, the machine room is a space adjacent to the indoor space, for example, and is connected to the under-floor space and the ceiling space. In the machine room, an air handling unit 12 and an inside air unit 30 which will be described later are installed.

Schematically, a general air conditioner 10 or the like supplies cool air to the indoor space, cools return air (warm air) from the indoor space, and generates cool air again. However, in this system, before that, the temperature of the return air (warm air) is lowered using the outside air.

In the illustrated example, the general air conditioner 10 sends cold air to the underfloor space, supplies cold air to the server installation space via the underfloor space, and cools each heating element 101 by this cold air. As a result, the cool air becomes warm air, and after this warm air flows into the ceiling space, it is returned to the air conditioner 10 as return air. In the preceding stage, the indirect outdoor air cooler 20 uses the outside air to lower the temperature. The air conditioner 10 may be the same as the conventional general air conditioner 110 described above.

In the following description, it is assumed that the temperature of the outside air is low. Note that “the temperature of the outside air is low” does not specifically mean what temperature or lower or the like, but depends on the temperature of the inside air (warm air) or the like. This is the same as before. One way of thinking is that indirect outside air cooling is intended to lower the temperature of the inside air (warm air) using outside air, and as a result, the temperature of the return air (warm air) can be lowered. It can be said that when the temperature of is low. As an example, as described above, when the temperature of the outside air is lower than the temperature of the inside air (warm air), it can be considered that the temperature of the outside air is low. However, the present invention is not limited to this example.

Here, the configuration for sending the cold air to the underfloor space is the general air conditioner 10 shown in the figure. The general air conditioner 10 includes a refrigerator 11, an air handling unit 12, an expansion valve 13, a refrigerant pipe 14, and the like. The refrigerator 11, the air handling unit 12, the expansion valve 13, and the refrigerant pipe 14 may be the same as the conventional refrigerator 111, the air handling unit 112, the expansion valve 113, and the refrigerant pipe 114 shown in FIG.

That is, the general air conditioner 10 may be the same as an existing general air conditioner (such as an air conditioner) such as the conventional air conditioner 110 described above. Therefore, although not shown or described in detail, the air handling unit 12 includes an evaporator 12a and a blower (fan) 12b as shown. The refrigerator 11 has not only a blower (fan) 11a shown but also a compressor and a condenser (not shown).

As described above, the general air conditioner 10 includes the evaporator 12a, which is a general air conditioner configuration, a compressor and a condenser (not shown), an expansion valve 13, and the like. The refrigerant circulates through. That is, the refrigerant circulates in a general compression refrigeration cycle (vapor compression refrigeration cycle or the like) of “evaporator → compressor → condenser → expansion valve → evaporator”. When the refrigerant evaporates in the evaporator 12a, the surrounding heat is taken away, thereby cooling the surrounding air (inflowing warm air). The deprived heat is radiated to the outside air or the like in the condenser. Outside air is sent to a condenser (not shown) by a blower (fan) 11a, and the condenser (not shown) radiates heat to the outside as described above. Of course, after that, this outside air is discharged out of the refrigerator 11.

Note that the wall 1 shown in the figure is a wall of an arbitrary building, and the indoor space and a space adjacent to the indoor space (machine room) exist in the building. The air handling unit 12, the inside air unit 30 and the like which will be described later are installed in the machine room, and the refrigerator 11 and the outside air unit 40 and the like which will be described later are installed outside the building. Inside air (indoor space and machine room) circulates while the inside air repeats a warm and cold state, and outside air exists outside the building.

The general air conditioner 10 is only described above, but as with the conventional air conditioner 110, the temperature of the return air (warm air) that flows into the air handling unit 12 of the general air conditioner 10 is reduced. It is desired to reduce the power consumption of the general air conditioner 10. However, naturally, even if the power consumption of the general air conditioner 10 is reduced, it does not make sense if the overall power consumption increases. Thus, it is conceivable to reduce the temperature of the inside air (warm air) using outside air, and the indirect outside air cooler 120 is conventionally provided.

On the other hand, in this example, the illustrated indirect outside air cooler 20 is provided.
Hereinafter, the indirect outside air cooler 20 will be described in detail.
First, the indirect outside air cooler 20 includes an inside air unit 30 and an outside air unit 40.

The inside air unit 30 and the outside air unit 40 are, for example, individually manufactured in a factory or the like, and then installed so as to be in close contact with the wall 1 (inner wall and outer wall, respectively) as illustrated.

In addition, although it is divided into the building exterior and the building with the wall 1 as a boundary, the outside air unit 40 is installed outside the building, and the inside air unit 30 is installed inside the building. That is, the outside air unit 40 is installed in close contact with the wall surface of the wall 1 outside the building. The inside air unit 30 is installed so as to be in close contact with the inner wall of the wall 1.

The inside air unit 30 includes, for example, the illustrated liquid-gas heat exchanger 31, a blower (fan) 32, a pipe 21 (part thereof: about half), and a circulation pump 22.

The outdoor air unit 40 includes, for example, the illustrated liquid-gas heat exchanger 41, a blower (fan) 42, and a pipe 21 (part thereof: about half).

When the inside air unit 30 is manufactured in a factory or the like, for example, a liquid-gas heat exchanger 31 and a blower shown in a box-shaped housing whose one surface is open (open; no state). (Fan) 32 etc. are provided. In addition, two holes (inner air inlet 33 and inner air outlet 34) shown in the figure are opened in the casing. Incidentally, the illustrated pipe 21 (pipe 21 to which the circulation pump 22 is connected in the middle) may already be connected to the liquid-gas heat exchanger 31 at the time of manufacture in a factory or the like, or the liquid-gas heat at the time of installation. You may connect to the exchanger 31. Alternatively, only the pipe 21 may be connected in the factory, and the circulation pump 22 may be connected to the pipe 21 at the time of installation.

When the outside air unit 40 is manufactured in a factory or the like, for example, a liquid-gas heat exchanger 41, a blower shown in a box-shaped housing whose one side is open (open; no state). (Fan) 42 and the like are provided.

Note that both the inside air unit 30 and the outside air unit 40 are installed so that the open surface matches the wall surface of the wall 1.

In addition, the housing of the outside air unit 40 has two holes (the outside air inlet 43 and the outside air outlet 44) shown in the figure. The illustrated pipe 21 may be already connected to the liquid-gas heat exchanger 41 at the time of manufacture in a factory or the like, or may be connected to the liquid-gas heat exchanger 41 at the time of installation.

In addition, at the time of installation, it is necessary to open two through holes for passing the pipe 21 through the wall 1. In addition, when the pipes 21 (partially; about half) are already provided in each of the inside air unit 30 and the outside air unit 40 at the time of manufacture in the factory, the pipes 21 are welded to each other (in addition, The circulation pump 22 is also connected), and the illustrated “pipe 21 to which the circulation pump 22 is connected” may be formed.

The indirect outside air cooler 20 is configured by installing the inside air unit 30 and the outside air unit 40 as described above.

In the indirect outside air cooler 20, as in the conventional configuration shown in FIG. 4, the outside air and the inside air are mutually blocked and heat exchange is performed, so the outside humidity, dust, and corrosive gas contained in the outside air are taken into the room. Therefore, the reliability of electronic devices such as servers is maintained.

Further, as described above, it is necessary to make a hole in the wall 1 for allowing the pipe 21 to pass through. However, as compared with the conventional case where

holes

126 and 127 for inflowing and exhausting outside air are provided, a smaller hole is sufficient. The installation work becomes easy.

In the inside air unit 30 after the installation, the blower (fan) 32 causes the warm air in the ceiling space to flow from the inside air inlet 33 and pass through the inside air unit 30 (particularly, the liquid-gas heat exchanger 31). After that, a flow of air that is discharged from the inside air discharge port 34 (shown by a one-dot chain line arrow in the figure) is created. Basically, the temperature of the warm air discharged from the inside air discharge port 34 is set lower than the temperature of the warm air flowing from the inside air flow inlet 33.

The warm air discharged from the inside air discharge port 34 flows into the air handling unit 12 and is cooled by the evaporator 12a or the like in the air handling unit 12 to become cool air, and this cool air is sent to the underfloor space by the blower (fan) 12b. Will be. By reducing the warm air temperature as described above, the power consumption of the general air conditioner 10 is reduced as compared with the case where the warm air in the ceiling space flows into the air handling unit 12 as it is.

In the outside air unit 40 after the installation, the blower (fan) 42 allows the outside air to flow in from the outside air flow inlet 43 and passes through the outside air unit 40 (particularly in the liquid-gas heat exchanger 41), and then the outside air discharge port. An air flow (indicated by a dotted arrow in the figure) is generated so as to be discharged from 44.

Here, the piping 21 is connected to the circulation pump 22 at an arbitrary position, and a liquid (for example, water) is sealed in the piping. Accordingly, by operating the circulation pump 22, this liquid (for example, water) circulates through the liquid-gas heat exchanger 31 and the liquid-gas heat exchanger 41 via the pipe 21. The liquid-gas heat exchanger 31 and the liquid-gas heat exchanger 41 may be the same.

Here, the liquid-gas heat exchangers 31 and 41 have an existing configuration and will be described briefly, although they will not be described in detail. The conventional heat exchanger 121 has two types of gas (both air, indoor warm air and outside air) passed through the heat exchanger 121 and heat exchange between the two types of gases, so that the outside air temperature is particularly high. When the temperature is low, the indoor warm air is cooled by the outside air. The liquid-gas heat exchangers 31 and 41 allow liquid (for example, water) and gas (in this case, air) to pass therethrough and exchange heat between the liquid and gas to cool the higher temperature. Is.

Note that the gas (air) is indoor warm air in the liquid-gas heat exchanger 31 and outside air in the liquid-gas heat exchanger 41. The liquid is water or the like circulated by the pipe 21 and the circulation pump 22.

When the outside air temperature is low, in the liquid-gas heat exchanger 41, the temperature of the liquid (such as water) decreases and the temperature of the outside air increases due to heat exchange between the liquid (such as water) and the outside air. A relatively cooler liquid (such as water) flows into the liquid-gas heat exchanger 31 via the pipe 21. Therefore, in the liquid-gas heat exchanger 31, heat exchange between the relatively low-temperature liquid (such as water) and the indoor warm air is performed. As a result, the temperature of the indoor warm air decreases and the temperature of the liquid (water, etc.) increases. As a result, the liquid (water or the like) having a relatively high temperature flows into the liquid-gas heat exchanger 41 via the pipe 21 and is cooled again by the outside air as described above. The outside air whose temperature has risen due to this is discharged from the outside air outlet 44.

Note that the air flow in the inside air unit 30 is directed downward (in the direction from the top to the bottom) in FIG. You can also. Similarly, the air flow in the outside air unit 40 is directed upward in FIG. 1 by the blower 42, but may be downward.

However, it is desirable that the air flow in the inside air unit 30 be downward as shown in FIG. In this way, the warm air warmed by the heating element 101 is on the upper side, and the air cooled by the liquid-gas heat exchanger 31 flows downward, so that the air flow in the inside air unit 30 is natural. It will be in line with natural phenomena without countering convection.

Here, the manufacture and installation work of the indirect outside air cooler 20 will be described.
In the example shown in FIG. 1, the outside air unit 40 and the inside air unit 30 have substantially the same shape and size of the casing (and therefore the mounting area on the wall is also substantially the same), and the wall 1 is the center. Therefore, the indirect outside air cooler 20 is formed by arranging and integrating them so as to be substantially symmetrical. The left and right are the stories on the figure.

When installing these units, for example, first, a plurality of through holes are made in the wall 1. Next, each of the outside air unit 40 and the inside air unit 30 is placed at a position where the frame of the casing is symmetrical with respect to the wall 1 (that is, approximately the same position with the wall 1 interposed therebetween as shown in FIG. 1). The outside air unit 40 and the inside air unit 30 are fixed with bolts / nuts or the like at the positions of the plurality of through holes through the plurality of through holes formed in the wall 1. Further, the pipe 21 is connected through another through hole.

In the example shown in FIG. 1, the outside air unit 40 and the inside air unit 30 are not only the housing but also the internal configuration is substantially the same (substantially symmetrical as shown), and the difference is the presence or absence of the circulation pump 22. Etc. Therefore, for example, in a factory or the like, a unit is manufactured without the circulation pump 22 without distinguishing between outside air and inside air, and this unit can be used as both the outside air unit 40 and the inside air unit 30 during installation. However, when the inside air unit 30 is used, it is necessary to connect the circulation pump 22 at the time of installation. However, the manufacturing efficiency in the factory is improved, so that the effect of cost reduction can be expected.

The indirect outside air cooler 20 described above has the following effects.
In other words, the indirect outside air cooler 20 has a pair of liquid-gas heat exchangers 31 and 41, in which the internal fluid is liquid and the external fluid is gas, arranged via the wall 1 separating the inside and outside of the building, and one liquid-gas External air is passed through the external fluid of the heat exchanger 41, internal air is passed through the external fluid of the other liquid-gas heat exchanger 31, and the internal fluid (liquid) of both liquid-gas heat exchangers is pipe 21. Circulate through. Thereby, heat exchange between the outside air and the inside air is performed.

The indirect outside air cooler 20 has the following effects due to the characteristics described above.
(1) The outside air unit 40 having the liquid-gas heat exchanger 41 for allowing the outside air to flow and the inside air unit 30 having the liquid-gas heat exchanger 31 for allowing the inside air to flow are symmetrical about the wall 1. Since these units 30 and 40 can be integrated with each other, it is possible to use a skeleton housing having almost the same structure, thereby reducing the manufacturing cost.

(2) Further, when installing the indirect outside air cooler 20, the outside air unit 40 and the inside air unit 30 are connected with bolts and nuts at the positions of the plurality of through holes through the plurality of through holes formed in the wall 1. Since it is fixed, the construction cost can be reduced and the installation work can be facilitated.

(3) Compared with the conventional system of FIG. 4 and the like, the duct portion can be reduced, and the pressure loss due to the duct resistance can be reduced.

Next, the air conditioning system (integrated air conditioning system) of Example 2 will be described.
In addition, although the air conditioning system of Example 2 can also be said to be a kind of indirect outside air cooling system, it is integrated and has a compact configuration.

The indirect outside air cooling system of the first embodiment has proposed a ductless, compact and easy installation configuration for the indirect outside air cooling device 20, but the general air conditioner 10 is substantially the same as the conventional one.

Example 2 proposes an integrated indirect outdoor air cooling system in which the functions of an indirect outdoor air cooler and the functions of a general air conditioner are integrated.

This makes it possible to simplify the overall device configuration, make the device more compact, reduce costs, and reduce overall power consumption.

FIG. 2 is a configuration diagram of the air conditioning system (integrated air conditioning system) of the second embodiment.
FIG. 3 is an enlarged view of a part of the configuration of FIG.

In FIG. 2, it is assumed that the space to be cooled by the integrated indirect outdoor air cooling system is the same as the example shown in FIGS. That is, the indoor space to be cooled is, for example, a server room in which a large number of server racks 102 on which heating elements 101 such as server devices (computer devices) are mounted are installed. Then, the cool air is sent out to the underfloor space, the cool air is supplied to the server installation space via the underfloor space, and each heating element 101 is cooled by this cool air. As a result, the cold air becomes warm air, and this warm air flows into the ceiling space.

Here, the configuration for sending the cool air to the underfloor space is the integrated indirect outdoor air cooling system 50 shown in the figure. The integrated indirect outside air cooling system 50 has a configuration in which the function of the indirect outside air cooler 20 and the function of the general air conditioner 10 are integrated. The integrated indirect outside air cooling system 50 allows the warm air in the ceiling space to flow in, first lowers the temperature of the warm air by the function of the indirect outside air cooler, and then generates cool air at a predetermined temperature by the function of the general air conditioner. . Hereinafter, a detailed description will be given with reference to FIGS.

The integrated indirect outside air cooling system 50 includes an inside air unit 60 and an outside air unit 70 shown in FIGS.

In the indirect outside air cooler function of the indirect outside air cooler 50, the outside air and the inside air are mutually cut off and heat exchange is performed as in the conventional example shown in FIG. 4 and the configuration shown in FIG. Therefore, the reliability of electronic devices such as servers is maintained because the outside air humidity, dust, and corrosive gas contained in are not taken into the room.

The inside air unit 60 and the outside air unit 70 are, for example, individually manufactured in a factory or the like, and then installed so as to be in close contact with the wall surface of the wall 1 as illustrated. At that time, the integrated indirect outside air cooling system 50 is configured by installing the illustrated pipe 51, the refrigerant pipe 52, etc. (or connecting (welding, etc.) one that has been made approximately half by two). The In addition, although it is necessary to provide a through-hole in the wall 1 in order to install the piping 51 and the refrigerant | coolant pipe | tube 52, this through-hole becomes four places similarly to the structure of FIG.1 and FIG.4. The production and installation of the inside air unit 60 and the outside air unit 70 may be substantially the same as the inside air unit 30 and the outside air unit 40 of the first embodiment, and will not be described in detail here.

The wall 1 is divided into a building outside and a building inside. The outside air unit 70 is installed outside the building, and the inside air unit 60 is installed inside the building. That is, the outside air unit 70 is installed in close contact with the wall surface of the wall 1 outside the building. The inside air unit 60 is installed so as to be in close contact with the inner wall surface of the wall 1.

It is desirable that the outside air unit 70 and the inside air unit 60 are provided at positions corresponding to each other across the wall 1. The positions corresponding to each other across the wall 1 are positions as illustrated in FIGS. 2 and 3, for example. When viewed from the outside air unit 70 side, for example, the inside air unit 60 exists on the back side of the wall 1. It is such a position. In other words, if the casing of the outside air unit 70 and the casing of the inside air unit 60 are substantially the same shape and size as shown in the figure, these two casings are as shown in the figure. They are arranged so as to have a substantially symmetrical relationship (almost symmetrical in the drawing) on the wall 1. Of course, the present invention is not limited to such an example, but basically, it is desirable to install so that the piping is shortened so as to facilitate installation.

The inside air unit 60 has a laminated body 61 and the like. The laminated body 61 has an evaporator 61a, a liquid-gas heat exchanger 61b, a blower (fan) 61c, etc., and these are laminated and integrated as shown in the figure. It should be noted that the configuration in which the evaporator, the liquid-gas heat exchanger, and the air blower (fan) are integrated as a laminated body has a number of advantages, but is not limited to this configuration example. However, since the feature of the second embodiment is an “integrated type” unit, the inside air unit 60 needs to be provided with an evaporator, a liquid-gas heat exchanger, and a blower (fan).

Also, the housing of the inside air unit 60 (for example, a box shape with one open surface) has holes such as the inside air inlet 62 and the inside air outlet 63 shown in the figure. The blower (fan) 61 c allows the warm air in the ceiling space to flow into the unit 60 from the internal air flow inlet 62 and pass through the inside air unit 60 (particularly, the laminated body 61), and then from the inside air discharge port 63. Create a flow of air that can be discharged (indicated by the dashed-dotted arrows in the figure).

The laminate 61 is configured such that the liquid-gas heat exchanger 61b is provided on the upstream side of such an air flow and the evaporator 61a is provided on the downstream side. Accordingly, the present invention is not limited to the illustrated configuration example, and any configuration that satisfies this condition may be used.

Although not particularly illustrated, it is necessary to configure so that a liquid-gas heat exchanger is provided on the upstream side of the air flow and an evaporator is provided on the downstream side even when the laminate (integrated type) is not used. . That is, it is necessary to adjust the internal air (warm air) to a predetermined temperature (set temperature) in the evaporator after the temperature is lowered by the liquid-gas heat exchanger.

The above is a description of the relative positional relationship between the liquid-gas heat exchanger 61b and the evaporator 61a, and the position of the blower (fan) 61c (arrangement order with respect to the air flow) in the laminate 61. Can be anywhere. That is, the blower 61c may be in any position of the most upstream position, the most downstream position, and the intermediate position (between the liquid-gas heat exchanger 61b and the evaporator 61a) of the air flow. This is the same even when the laminate is not used. This is also the same for the laminated body 71 described later.

The outside air unit 70 has a laminated body 71 and the like. The laminated body 71 includes a condenser 71a, a liquid-gas heat exchanger 71b, a blower (fan) 71c, etc., and these are laminated and integrated as shown in the figure. However, like the inside air unit 60, it is not necessarily limited to the example of the laminated body. However, like the inside air unit 60, the outside air unit 70 needs to be provided with a condenser, a liquid-gas heat exchanger, and a blower (fan).

Also, the outside air unit 70 is provided with holes such as the outside air inlet 72 and the outside air outlet 73 shown in the figure. The blower (fan) 71c allows the outside air to flow into the unit 70 from the outside air flow inlet 72, passes through the inside of the outside air unit 70 (particularly within the laminated body 71), and then is discharged from the outside air discharge port 73. Create a flow (indicated by dotted arrows on the diagram).

The laminate 71 is configured such that the liquid-gas heat exchanger 71b is provided on the upstream side of such an air flow, and the condenser 71a is provided on the downstream side. Further, as already described, the position of the blower (fan) 71c (arrangement order with respect to the air flow) may be anywhere with respect to the layered body 71 as well, as in the case of the layered body 61 (therefore limited to the illustrated configuration example). Any configuration that satisfies the above conditions is acceptable. This is the same even when the laminate is not used.

As described above, both the inside air unit 60 and the outside air unit 70 are examples of the configurations shown in FIGS. 2 and 3, and are not limited to this example.

The configuration and manufacturing method of the laminates 61 and 71 may be various. Although not described in detail here, the configuration and the manufacturing method are as easy to manufacture and / or as compact as possible. Is desirable. For example, taking the laminated body 61 as an example, the evaporator 61a, the liquid-gas heat exchanger 61b, and the blower (fan) 61c are all housed (unitized) in an arbitrary housing, and the size of the housing is also described. It is conceivable that the shapes are substantially the same. Further, as an example, the shape of the casing may be a substantially rectangular parallelepiped, for example, and the shape of the stacked body 61 may be a substantially rectangular parallelepiped by stacking these three rectangular parallelepipeds.

In this example, the evaporator 61a, the liquid-gas heat exchanger 61b, and the blower (fan) 61c are stacked and integrated (formation of the stacked body 61). This is done by connecting each other. The connection between the housings may be a general method, for example, fixing a nut or the like through a rod or a bolt in a hole provided in a corner of each housing.

Of course, the casing is provided with a number of holes for allowing the inside air to pass therethrough and holes for passing various pipes.

Here, the liquid-gas heat exchangers 61 b and 71 b are connected to each other via a pipe 51 in substantially the same manner as the liquid-gas heat exchangers 31 and 41 of the first embodiment. The liquid (such as water) in the liquid circulates in the liquid-gas heat exchangers 61 b and 71 b and the pipe 51. The liquid-gas heat exchangers 61b and 71b may have the same configuration as the liquid-gas heat exchangers 31 and 41, and are existing configurations and will not be described in detail.

In the liquid-gas heat exchanger 61b, the liquid (such as water) passes and the inside air (warm air) passes. As a result, heat exchange between the liquid (such as water) and the warm air is performed in the liquid-gas heat exchanger 61b, and the warm air is basically cooled (the heat of the warm air moves to the liquid). The temperature will drop. However, this depends on the temperature of the outside air and the warm air, and it is not guaranteed that the temperature of the warm air decreases. However, when the temperature of the outside air is high, it can be considered that the circulation pump 53 is stopped.

Further, a refrigerant pipe 52, an expansion valve 54, and a compressor 55 are provided for the evaporator 61a and the condenser 71a. Each of these components is substantially the same as each component of the general air conditioner 10. That is, in the general air conditioner 10, the air handling unit 12 includes the evaporator 12a and the fan 12b, and the evaporator 61a has a configuration corresponding to the evaporator 12a. Further, as described above, the refrigerator 11 is provided with a compressor and a condenser (not shown). The compressor 55 and the condenser 71a correspond to these components. The expansion valve 54 has a configuration corresponding to the expansion valve 13.

As shown in the figure, the evaporator 61a, the condenser 71a, the expansion valve 54, and the compressor 55 are connected to the refrigerant pipe 52. The refrigerant circulates through the evaporator 61 a, the condenser 71 a, the expansion valve 54, and the compressor 55 through the refrigerant pipe 52. That is, the refrigerant circulates in a general compression refrigeration cycle (such as a vapor compression refrigeration cycle) of “evaporator 61a → compressor 55 → condenser 71a → expansion valve 54 → evaporator 61a”. When the refrigerant evaporates in the evaporator 61a, the surrounding heat is taken away, thereby cooling the surrounding air. The deprived heat is radiated to the outside air or the like in the condenser 71a. The functions of the expansion valve 54 and the compressor 55 are conventional and will not be described in particular.

As illustrated, the expansion valve 54 is provided in the inside air unit 60, but may be provided in the outside air unit 70. The compressor 55 is provided in the outside air unit 70, but may be provided in the inside air unit 60. That is, the configuration in which the expansion valve 54 is provided in the inside air unit 60 and the compressor 55 is provided in the outside air unit 70, and the expansion valve 54 is provided in the outside air unit 70, and the compressor 55 is provided in the inside air unit 60. There may be a configuration in which both the expansion valve 54 and the compressor 55 are provided in the inside air unit 60, and a configuration in which both the expansion valve 54 and the compressor 55 are provided in the outside air unit 70.

The circulation pump 53 is provided in the inside air unit 60 in the illustrated example, but may be provided in the outside air unit 70.

The liquid-gas heat exchanger 61b and the liquid-gas heat exchanger 71b are heat exchangers that perform heat exchange between the liquid and the gas, but are not limited to this example. Instead of these liquid-gas heat exchangers, a heat exchanger (referred to as a gas-gas heat exchanger) that performs heat exchange between gases may be provided. Of course, in this case, some gas is used instead of the liquid. Here, if such a liquid or gas is generically called “fluid”, the liquid-gas heat exchanger or gas-gas heat exchanger is generically called a fluid-gas heat exchanger or It may be called a fluid-fluid heat exchanger. In this case, it can be said that some “fluid” flows through the pipe 51. In other words, two heat exchangers (liquid-gas heat exchanger 61b and liquid-gas heat exchanger 71b in the illustrated example, but not limited to this example as described above) are connected to any heat exchanger via the pipe 51. It can be said that the “fluid” is circulated.
Heretofore, each configuration of the integrated indirect outdoor air cooling system 50 has been described.

Hereinafter, the operation of the integrated indirect outdoor air cooling system 50 having the above-described configurations will be described.
That is, when the inside air (warm air) in the ceiling space flows into the inside air unit 60 through the inside air flow inlet 62, first, the warm air passes through the liquid-gas heat exchanger 61b, so that the warm air and Heat exchange is performed with a liquid (such as water), and the temperature of the warm air decreases. The degree of the reduction depends on the outside air temperature (liquid temperature) and the warm air temperature.

The warm air whose temperature has been lowered passes through the evaporator 61a. As a result, the warm air whose temperature has been lowered is cooled by the evaporator 61a, and the temperature is further lowered to become cold air. This cold air is controlled to be a predetermined temperature (set temperature). For this reason, there is of course a controller 80 (not shown) (not shown). The controller 80 controls the entire integrated indirect outdoor air cooling system 50, and performs various controls such as control of the rotational speed of each fan and control of the circulation pump 53, but is not particularly described here. The controller 80 has an arithmetic device such as a CPU and a storage device such as a memory. The controller 80 executes programs stored in advance in the memory and inputs measurement values from various sensors (not shown) as needed. By doing so, the integrated indirect outdoor air cooling system is controlled.

Further, the controller 80 may be provided in the case of the inside air unit 60 or the case of the outside air unit 70, or may be provided outside these units (in the vicinity of the unit, etc.). In FIG. 3, various signal lines and the like related to the controller 80 are not shown, but actually exist, and the controller 80 transmits various signals such as the integrated indirect outdoor air cooling system 50 and the like via these signal lines. Control the configuration. For example, a temperature sensor (not shown) is provided in the vicinity of the air outlet of the blower 61c, and the controller 80 obtains a temperature measured by the temperature sensor via a signal line (not shown). And the controller 80 controls each structure which concerns on the said general compression-type refrigerating cycle via a signal line not shown so that this measured temperature may become preset temperature.

As already described, in this example, the liquid-gas heat exchanger 61b is disposed upstream of the warm air flow, and the evaporator 61a is disposed downstream.

The cold air generated by the evaporator 61a is discharged from the inside air outlet 63 (passes through the blower 61c). Here, as shown in FIG. 2, the inside air outlet 63 is disposed so as to be connected to the underfloor space. For this reason, unlike the indirect outdoor air cooling system 20 of FIG. 1, the integrated indirect outdoor air cooling system 50 is installed so that a part thereof enters under the floor as shown in FIG. Thus, the cold air discharged from the inside air discharge port 63 flows into the underfloor space, flows into the server installation space via the underfloor space, and cools the heating element 101. The cool air becomes warm air by cooling the heating element 101, and this warm air flows into the space behind the ceiling and again flows into the internal air unit 60 from the internal air flow inlet 62.

On the other hand, with respect to the outside air unit 70, outside air that has flowed into the outside air unit 70 through the outside air inlet 72 first passes through the liquid-gas heat exchanger 71b, so that the outside air and liquid (such as water) are exchanged. Heat exchange between the two. The temperature of the liquid (water or the like) is increased by exchanging heat with warm air in the liquid-gas heat exchanger 61b. In this way, heat exchange is performed between the liquid (water or the like) whose temperature is high and the outside air, so that the temperature of the liquid (water or the like) decreases. The liquid (such as water) whose temperature has decreased is supplied again to the liquid-gas heat exchanger 61b side by the circulation pump 53 and the pipe 51.

On the other hand, the temperature of the outside air rises due to heat exchange with the liquid (such as water) when passing through the liquid-gas heat exchanger 71b. The outside air whose temperature has risen continues to pass through the condenser 71a, and the condenser 71a is further radiating heat as described above, so that the temperature rises further, and is then discharged from the outside air outlet 73. It will be.

Note that “inside the building” in the above description may be called “inside the room”. Therefore, the “indoor side” includes not only “indoor space to be cooled” but also a machine room and the like. In other words, the “indoor side” can be said to be a space in which the “inside air” (air in the building) exists. Similarly, “outside of building” in the above description may be referred to as “outdoor”. In other words, the “outdoor” can be said to be a space where the “outside air” (air outside the building) exists. The “indoor space” has a slightly different meaning from the “indoor side”, and means “the space to be cooled by the indirect outside air cooling system (the room space to be cooled)”. Therefore, the “indoor space” does not include a machine room or the like.

According to the integrated indirect outside air cooling system 50 described above, the following effects are mainly obtained.
(A) Downsizing In the past and in Example 1, there were two devices, a general air conditioner and an indirect outside air cooler. However, by integrating these two devices, the size can be reduced. Thus, the installation space can be reduced. For example, even when the machine room is small, it is easy to install (or it is possible to install a machine room that is too narrow to be installed in the past).

(B) Construction cost reduction by ductless and wall surface mounting This effect is the same as in the first embodiment, and there is no need to provide a duct as in the prior art. Since the inside air unit and the outside air unit are manufactured in advance at a factory, for example, and these units are simply attached to the wall surface during construction (although work such as making holes for piping is necessary), the labor of construction can be reduced. Therefore, the construction cost can be reduced.

(C) Downsizing and improvement of manufacturability by the laminated body Conventionally, in Example 1 and the like, for example, regarding the configuration in the building, there are various evaporators, liquid-gas heat exchangers, fans, etc. Manufacturing was done individually). On the other hand, in the second embodiment, miniaturization can be achieved by forming a laminated body in which an evaporator, a liquid-gas heat exchanger, and a fan are laminated and integrated. Moreover, since it manufactures collectively, without manufacturing separately, it becomes easy to manufacture. In particular, as shown in FIGS. 2 and 3, it can be expected that the manufacturability is further improved by aligning the shapes and sizes so as to be substantially the same. In addition, the effect of being easy to carry and easy to install can be expected.

(D) Reduction of blowing power (fan power) and price reduction by using a common fan In the configuration of the second embodiment, the number of fans can be reduced as compared with the prior art and the first embodiment. Lower prices can be achieved. For example, in the configuration of the first embodiment illustrated in FIG. 1, the fans are provided with four fans: a fan 11 a, a fan 12 b, a fan 32, and a fan 42. On the other hand, in the configuration of Embodiment 2 shown in FIGS. 2 and 3, only two fans 61c and 71c are required. That is, the number of fans can be halved. Thus, for example, the cost of purchasing a fan can be halved. Also, power is required to operate the fan, but this power can be less for two compared to four.

According to the integrated air conditioning system of the present invention, there are conventionally two devices, a general air conditioner and an indirect outside air cooler. However, by integrating these two devices, the size can be reduced. Conventionally, evaporators, compressors, heat exchangers, fans, etc. existed separately, but by making these laminates integrated into one, further downsizing can be achieved, Easy to manufacture. Furthermore, the number of fans can be reduced, thereby reducing the blowing power and reducing the price.

Claims

An inside air unit through which inside air passes and an outside air unit through which outside air passes,
The inside air unit has a first heat exchanger, an evaporator, and a first blower for allowing the inside air to pass through the first heat exchanger and the evaporator,
The outside air unit includes a second heat exchanger, a condenser, and a second blower for allowing the outside air to pass through the second heat exchanger and the condenser.
Provided is a refrigerant pipe connected to the evaporator, the condenser, an expansion valve provided in any of the outside air unit and the inside air unit, and a compressor provided in any of the outside air unit and the inside air unit. The refrigerant, the condenser, the expansion valve, and the compressor are circulated through the refrigerant pipe to constitute an air conditioner using a compression refrigeration cycle,
A pipe connected to the first heat exchanger and the second heat exchanger is provided, and an arbitrary fluid is circulated through the pipe to the first heat exchanger and the second heat exchanger, Heat exchange between the fluid and the outside air in a second heat exchanger to cool the fluid with the outside air, and heat exchange between the cooled fluid and the inside air in the first heat exchanger. And an indirect outside air cooler configured to cool the inside air with the fluid.
The said inside air unit WHEREIN: The 1st laminated body which the said 1st heat exchanger, the said evaporator, and the said 1st air blower were laminated | stacked and integrated was comprised. Integrated air conditioning system.
The said outside air unit WHEREIN: The 2nd laminated body which laminated | stacked and integrated the said 2nd heat exchanger, the said condenser, and the said 2nd air blower is comprised. The integrated air conditioning system described.
2. The inside air unit, wherein the first heat exchanger is provided upstream of the inside air flow formed by the first blower, and the evaporator is provided downstream. The integrated air conditioning system according to any one of 1 to 3.
The said outside air unit WHEREIN: The said 2nd heat exchanger is provided in the upstream of the flow of the said outside air formed with the said 2nd air blower, and the said condenser is provided in the downstream. The integrated air conditioning system according to any one of 1 to 4.
An indoor air unit that is provided on the indoor side and through which the inside air passes is provided corresponding to an outside air unit that is provided on the outdoor side and through which the outside air passes.
A first heat exchanger, an evaporator, and a first blower for passing the inside air through the first heat exchanger and the evaporator;
Refrigerant piping connected to the evaporator, a condenser in the outside air unit, an expansion valve provided in the outside air unit or the inside air unit, and a compressor provided in the outside air unit or the inside air unit. The air conditioner by the compression refrigeration cycle is configured by circulating the refrigerant to the evaporator, the condenser, the expansion valve, and the compressor through the refrigerant pipe,
It has a part of liquid piping connected to the 1st heat exchanger and the 2nd heat exchanger in the outside air unit, and the 1st heat exchanger and the 2nd heat are connected via the liquid piping. An indirect outside air cooler configured to cool the inside air by causing heat exchange between the fluid and the inside air in the first heat exchanger by circulating an arbitrary fluid through the exchanger is configured. A shy unit.
An outside air unit that is provided on the indoor side and is provided corresponding to an inside air unit through which the inside air passes, and is provided outside the room and through which the outside air passes.
A second heat exchanger, a condenser, and a second blower for allowing the outside air to pass through the second heat exchanger and the condenser;
Refrigerant piping connected to the condenser, an evaporator in the inside air unit, an expansion valve provided in the inside air unit or the outside air unit, and a compressor provided in the inside air unit or the outside air unit. The air conditioner by the compression refrigeration cycle is configured by circulating the refrigerant to the evaporator, the condenser, the expansion valve, and the compressor through the refrigerant pipe,
It has a part of liquid piping connected to the 2nd heat exchanger and the 1st heat exchanger in the inside air unit, and the 1st heat exchanger and the 2nd heat are connected via the liquid piping. An outside air unit comprising an indirect outside air cooler configured to circulate an arbitrary fluid through an exchanger so that heat is exchanged between the fluid and the outside air in the second heat exchanger to cool the fluid. .
A configuration for cooling the inside air provided in an indoor air unit provided on the indoor side through which the inside air passes, provided corresponding to an outside air unit provided outside the room through which the outside air passes,
A first heat exchanger that allows the fluid exchanged with the outside air in the outside air unit and the inside air to pass through and exchanges heat between the fluid and the inside air;
An evaporator constituting a compression refrigeration cycle together with the outside air unit;
The first blower
A laminate that is laminated and integrated.
It is provided in an outdoor air unit that is provided on the indoor side and is provided corresponding to an indoor air unit through which the internal air passes, and is provided in an outdoor air unit that is provided on the outdoor side and through which the external air passes.
A second heat exchanger that allows the fluid exchanged with the inside air in the inside air unit and the outside air to pass through and exchanges heat between the fluid and the outside air;
A condenser constituting a compression refrigeration cycle together with the inside air unit;
The second blower
A laminate that is laminated and integrated.