JP2009133544A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system capable of achieving energy saving operation by integrally combining an electronic device cooler with a multi-chamber air conditioner. <P>SOLUTION: This air conditioning system includes: the multi-chamber air conditioner 130 capable of performing cooling operation or heating operation for a number of chambers at the same time, or performing the cooling operation and the heating operation in a mixed manner; an electronic device cooler 1 which has a cabinet with a fan for storing a plurality of electronic devices, and is so constituted that the front and back are opened, a rear opening of the cabinet has a ventilating rear door, an evaporator 21 constituting a refrigerating cycle is provided in the rear door, and air blown by the fan including exhaust heat of the electronic devices is cooled by the evaporator 21 and returned to the interior. One end of the evaporator 21 of the electronic device cooler 1 is connected to a low-pressure gas pipe 112 of the multi-chamber air conditioner, and the other end is connected to a liquid pipe 113. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an air conditioner in which a plurality of electronic devices are housed in a cabinet, and an electronic device cooling device that cools the electronic devices using a refrigerant evaporator and a multi-room air conditioning device are combined together. About the system.

In general, an air-water heat exchanger is arranged on the air outlet side of a cabinet for housing electronic equipment, and the air blown by a fan attached to the electronic equipment housed in the cabinet is used as the air-water heat exchanger. There is known an electronic device cooling system that cools and returns to the room (for example, see Patent Document 1). This type of electronic device cooling system is installed in a computer room and cools servers and network devices installed in the computer room.
US Patent Application Publication No. 2006/0232945

By the way, since electronic devices are vulnerable to water, it is desirable not to bring water into the computer room. However, since the air-water heat exchanger is disposed in the vicinity of the electronic device in the conventional device, if water leaks even from a part of the path through which the chiller water circulates in the air-water heat exchanger. This water may damage the electronic equipment.
In order to solve this problem, an electronic device cooling system using a refrigerant evaporator instead of an air-water heat exchanger has been devised. In this electronic device cooling system, as the electronic device capacity in the computer room increases, an outdoor unit equipped with a large-capacity compressor is required, and energy-saving operation is expected.
Therefore, an object of the present invention is to provide an air-conditioning system that can solve the problems of the conventional techniques described above and can achieve energy-saving operation in which an electronic device cooling device and a multi-room air conditioning device are combined together. There is.

  In order to solve the above problems, the present invention provides an outdoor unit having a compressor and an outdoor heat exchanger and a plurality of indoor units having an indoor heat exchanger connected by inter-unit piping, and the outdoor heat exchanger One end of the compressor is selectively connected to the refrigerant discharge pipe and the refrigerant suction pipe of the compressor, and the inter-unit pipe is connected to the high-pressure gas pipe connected to the refrigerant discharge pipe and the refrigerant suction pipe. A low-pressure gas pipe and a liquid pipe connected to the other end of the outdoor heat exchanger, and one end of the indoor heat exchanger is alternatively selected from the high-pressure gas pipe and the low-pressure gas pipe. A multi-room air-conditioning system configured to be connected and connected to the liquid pipe at the other end so that the multi-chamber can be simultaneously operated in a cooling operation or a heating operation, or the cooling operation and the heating operation can be performed in combination. Houses devices and multiple electronic devices with fans A front opening and a rear opening of the cabinet, a rear door capable of venting the rear opening of the cabinet, an evaporator constituting a refrigeration cycle inside the rear door, and the air blown by the fan An electronic device cooling device configured to cool the air containing exhaust heat of the device with the evaporator and return the air to the room, and one end of the evaporator of the electronic device cooling device is connected to the low pressure of the multi-room air conditioner A gas pipe is connected, and the other end is connected to the liquid pipe.

  In this case, a sensor for detecting the exhaust heat temperature of the electronic device is provided, and the rotation speed of the compressor is controlled by giving priority to the detection temperature of the sensor over the detection temperature of another indoor heat exchanger. May be. Further, the exhaust heat of the electronic device may be absorbed by the evaporator so that it can be used for the heating operation of the multi-room type air conditioner.

  In the present invention, a heating operation or a hot water supply operation of a multi-room type air conditioner that collects exhaust heat of each electronic device can be performed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a refrigerant circuit diagram of a multi-room type air conditioner.
The multi-room type air conditioner 130 includes a plurality of outdoor units 100 including a compressor 102, outdoor heat exchangers 103a and 103b, outdoor expansion valves 127a and 127b, and an indoor unit including an indoor heat exchanger 106a and an indoor expansion valve 118a. The unit 105a includes an indoor unit 105b including an indoor heat exchanger 106b and an indoor expansion valve 118b, and a hot water storage unit 150 including a hot water storage heat exchanger 141, a hot water storage tank 143, a circulation pump 145, and an expansion valve 147. The plurality of outdoor units 100 are units having the same configuration, and are connected in parallel to an inter-unit pipe 110 described later.

The outdoor unit 100, the indoor units 105a and 105b, and the hot water storage unit 150 are connected by the inter-unit piping 110, and the multi-room air conditioner 130 operates the indoor units 105a and 105b at the same time while operating the hot water storage unit 150. Alternatively, the heating operation can be performed, or the cooling operation and the heating operation can be performed in combination. In the outdoor unit 100, one end of the outdoor heat exchanger 103a is exclusively connected to the discharge pipe 107 or the suction pipe 108 of the compressor 102 via the switching valve 109a or the switching valve 109b. Similarly, one end of the outdoor heat exchanger 103b is exclusively connected to the discharge pipe 107 or the suction pipe 108 of the compressor 102 via the switching valve 119a or the switching valve 119b. An accumulator 104 is disposed in the suction pipe 108.
The outdoor unit 100 includes an outdoor control device (not shown), and the outdoor control device includes the compressor 102, the outdoor expansion valves 127a and 127b, the switching valves 109a, 119a, 109b, and 119b in the outdoor unit 100, and a multi-room type air conditioner. The entire 130 is controlled.

  The inter-unit pipe 110 includes a high-pressure gas pipe 111, a low-pressure gas pipe 112, and a liquid pipe 113. The high pressure gas pipe 111 is connected to the discharge pipe 107 and the low pressure gas pipe 112 is connected to the suction pipe 108. The liquid pipe 113 is connected to the other ends of the outdoor heat exchangers 103a and 103b via outdoor expansion valves 127a and 127b, respectively.

One end of each of the indoor heat exchangers 106a and 106b of the indoor units 105a and 105b is connected to the high pressure gas pipe 111 via the discharge side valves 116a and 116b, and the low pressure gas pipe via the suction side valves 117a and 117b. 112. Further, the other end thereof is connected to the liquid pipe 113 via the indoor expansion valves 118a and 118b. When one of the discharge side valve 116a and the suction side valve 117a is opened, the other is closed. Similarly, when one of the discharge side valve 116b and the suction side valve 117b is opened, the other is closed. Thereby, one end of each indoor heat exchanger 106a, 106b is alternatively connected to the high pressure gas pipe 111 and the low pressure gas pipe 112 of the inter-unit pipe 110.
The indoor units 105a and 105b further include indoor fans 123a and 123b, a remote controller, and an indoor control device. The indoor fans 123a and 123b are disposed in proximity to the indoor heat exchangers 106a and 106b, respectively, and send air to the indoor heat exchangers 106a and 106b. Each remote controller is connected to each of the indoor units 105a and 105b, and outputs a cooling or heating operation command, a stop command, or the like to each indoor control device of each indoor unit 105a and 105b.

  In the hot water storage unit 150, one end of the hot water storage heat exchanger 141 is connected to the high-pressure gas pipe 111 via the switching valve 148, and the other end of the hot water storage heat exchanger 141 is connected to the liquid pipe 113 via the expansion valve 147. The A water pipe 146 is connected to the hot water storage heat exchanger 141, and a hot water storage tank 143 is connected to the water pipe 146 through a circulation pump 145.

  In the present embodiment, the electronic device cooling system 1 is connected to the inter-unit pipe 110 in parallel with the indoor units 105a and 105b. As shown in FIG. 2, the electronic device cooling system 1 includes a plurality of server racks 10 disposed in a computer room 2, and a plurality of electronic devices 3 such as servers housed in the server racks 10. It is a system which cools (refer FIG. 3). The floor of the computer room 2 is configured as a double floor, and the server rack 10 is placed on the double floor.

  FIG. 3 is a diagram showing an outline of the server rack 10. The server rack 10 includes a cabinet 11 having an open front surface and a rear surface, and a plurality of electronic devices 3 are stacked in the cabinet 11 so as to be stacked up and down with the back surface facing the rear surface of the cabinet 11. In addition, a rear door 12 is provided on the rear surface of the cabinet 11 so that the rear opening 65 can be opened and closed so that the rear surface opening 65 can be closed. The rear door 12 is configured to be freely ventilated and the electronic device cooling unit 20 is configured therein. Is done. Further, a caster 13 is provided at the bottom of the server rack 10 so that the server rack 10 can be easily moved.

  The electronic device 3 is a server or a network device. Generally, this type of electronic device is a fan-equipped electronic device provided with a cooling fan 4, and the fan 4 is driven when the temperature in the device exceeds a predetermined temperature. In addition, it has a forced air cooling function that introduces outside air into the equipment and discharges it from the back of the equipment. For this reason, by arranging the electronic device 3 with the rear surface thereof facing the rear surface of the cabinet 11, as shown in FIG. The air is sucked in, the electronic device 3 is cooled and flows, and returns to the room through the rear door 12. Opening the rear door 12 facilitates access to the electronic device 3 in the cabinet 11.

  The electronic device cooling unit 20 includes an evaporator 21, and when the air discharged from the electronic device 3 flows through the evaporator 21 in the rear door 12, the evaporator 21 cools the air and returns it to the room. The evaporator 21 extends substantially vertically above and below the rear door 12, and is divided into an upper evaporator 22 and a lower evaporator 23 with a substantially middle portion between the upper and lower sides, and cooling of the electronic device 3 in the upper half of the cabinet 11. Is configured so that the upper evaporation unit 22 is responsible for cooling the lower half of the electronic device 3. Flexible refrigerant pipes 25 and 26 are connected to the evaporator 21. After extending downward, these refrigerant pipes 25 and 26 pass through the opening 2C in the upper floor 2A of the computer room 2 as shown in FIG. The main pipe 31 extending into the underfloor space between the upper floor 2A and the lower floor 2B.

  As shown in FIG. 1, the main pipe 31 includes a first pipe 31A and a second pipe 31B. The first pipe 31A is connected to the low-pressure gas pipe 112 via a valve 248, the second pipe 31B is connected to the liquid pipe 113 via a valve 247, and the low-pressure gas pipe 112 and the liquid pipe 113 are composed of a plurality of pipes. (4 units shown in FIG. 2) connected to the outdoor unit 100. In this configuration, since the refrigerant circulating in the refrigeration cycle is supplied to the evaporator 21 of the electronic device cooling unit 20, even if the refrigerant leaks from the path through which the refrigerant circulates, the refrigerant evaporates immediately. In addition, the electronic device 3 can be prevented from being damaged such as a short circuit or an electric leakage.

Next, the server rack will be described.
FIG. 4 is an external view of the server rack, and FIG. 5 is a perspective view showing a state in which the rear door is opened. The server rack 10 includes a cabinet 11 for storing the electronic device 3 (see FIG. 3), and a rear door 12 that opens and closes a rear opening 65 of the cabinet 11 so as to be freely closed.
The cabinet 11 has a size that matches the standard of the electronic device to be stored, and is formed in a rectangular shape including a sheet metal top plate 11A, a bottom plate 11B, and side plates 11C and 11D. A front opening 64 (see FIG. 2) and a rear opening 65 are formed on the front and rear surfaces of the cabinet 11, respectively, and the room air in the computer room 2 flows into the cabinet 11 through the openings 64 and 65. Further, the cabinet 11 includes a partition plate (shelf) 11E disposed between the top plate 11A and the bottom plate 11B substantially parallel to the top plate 11A and the bottom plate 11B. This partition plate 11E partitions the inside of the cabinet 11, and the electronic device 3 is arrange | positioned on the partition plate 11E.
The partition plate 11E is supported by support portions (not shown) formed on both side plates 11C and 11D, and a plurality of support portions are provided at predetermined intervals in the vertical direction. Accordingly, the partition plate 11E can be disposed on the support portion at a desired position, or the plurality of partition plates 11E can be disposed in the cabinet 11.

The rear door 12 is formed by bending a metal (for example, aluminum) plate. One end of the rear door 12 is connected to the cabinet 11 via a hinge 66 and is operated when the rear door 12 is opened and closed on the other end. A handle 67 is formed. When the handle 67 is operated and the handle 67 is pulled toward the front side, the rear door 12 rotates about the hinge 66 as shown in FIG. 5 to open the rear surface opening 65 of the cabinet 11.
Further, as shown in FIG. 4, an opening 12A is formed in a substantially central portion of the outer surface of the rear door 12, and a surface material in which a hole 68 having a predetermined diameter is formed on one surface in the opening 12A. 69 is arranged. The surface material 69 allows the rear door 12 to pass through the holes 68 and functions to prevent the evaporator 21 disposed inside the rear door 12 from being exposed to the outside, thereby improving the aesthetics of the server rack 10. ing.
Here, each hole 68 of the surface material 69 is formed so as to have an opening ratio of, for example, 60% or more so as not to inhibit ventilation.
Further, the diameter of the hole 68 is set to be smaller than that of a human finger. According to this, for example, an operator of the electronic device 3 arranged in the server rack 10 is prevented from touching the evaporator 21 through the hole 68, and an accident such as a finger being injured by the fins of the evaporator 21 is prevented. Can be prevented.

  On the inner surface of the rear door 12, as shown in FIG. 6, the evaporator 21 disposed in substantially the entire area of the rear door 12 and the expansion valves 28 </ b> A and 28 </ b> B provided in the liquid branch pipes 27 </ b> A and 27 </ b> B connected to the evaporator 21. And an electrical unit 51 for controlling the opening degree of the expansion valves 28A and 28B. By integrally arranging the evaporator 21, the expansion valves 28 </ b> A and 28 </ b> B, and the electrical unit 51 on the inner surface of the rear door 12, these can be handled as the integrated electronic device cooling unit 20, and this is connected to the outdoor unit 100. Thus, the heat generated by the electronic device 3 can be easily cooled.

As shown in FIGS. 6 and 7, the evaporator 21 is divided into an upper evaporating unit 22 and a lower evaporating unit 23 with a substantially intermediate portion in the vertical direction as a boundary. The upper evaporation section 22 and the lower evaporation section 23 include small-diameter liquid branch pipes 27A and 27B connected to the respective evaporation sections 22 and 23 and a large-diameter gas pipe 29. The liquid branch pipes 27A and 27B and The gas pipes 29 are collectively arranged on the hinge 66 side of the rear door 12.
In this configuration, as shown in FIG. 6, the gas pipe 29 is disposed closer to the hinge 66 of the rear door 12 than the liquid pipe 27 (liquid branch pipes 27 </ b> A and 27 </ b> B).
For this reason, the large-diameter flexible gas pipe 26 connected to the gas pipe connecting portion POUT of the gas pipe 29 is disposed at a position closer to the hinge 66. Therefore, when the rear door 12 is opened and closed, the amount of flexure of the flexible gas pipe 26 is increased. The rear door 12 can be opened and closed with a small force.

  As shown in FIG. 7, the evaporator 21 is a fin-tube type heat exchanger configured to include a refrigerant pipe 70 through which a refrigerant flows and a plurality of heat radiation fins 71 arranged in layers on the refrigerant pipe 70. The tube plates 72 for holding the fins 71 are disposed at both ends of the evaporator 21. When the evaporator 21 is disposed on the rear door 12 (see FIG. 6), the tube sheet 72 is provided with a mounting portion 72A extending substantially parallel to the rear door 12 on the rear door 12 side, and is formed in a substantially L shape. Yes. In the present embodiment, the evaporator 21 is fixed in the rear door 12 by being screwed to the rear door 12 using the mounting portion 72A.

  As shown in FIG. 6, an electrical unit 51 is disposed in the lower region of the evaporator 21. The electrical unit 51 is communicably connected to the control controller of the outdoor unit 100 (see FIG. 1) described above. As shown in FIG. 2, the internal / external communication line connecting the electrical unit 51 and the outdoor unit 100 passes through the opening hole 2C and the underfloor space between the upper floor 2A and the lower floor 2B together with the flexible pipes 25 and 26. Since it is routed, the length of the internal / external communication line can be shortened. For this reason, this internal / external communication line is prevented from picking up noise, and the electronic device cooling unit 20 can be operated stably.

In this configuration, as shown in FIGS. 5 and 6, on the inner surface of the rear door 12, a cover member 74 having a hole 73 having a predetermined diameter formed on substantially one surface is disposed so as to cover the evaporator 21. The cover material 74 is formed of a punching plate like the surface material 69 and allows the rear door 12 to pass through each hole 73.
Even when the rear door 12 is opened, the cover member 74 prevents a person other than the service person of the electronic device cooling unit 20 from touching the fins of the evaporator 21 by mistake. The cover member 74 is fixed to the rear door 12 with screws through screw holes (not shown) formed in the periphery. Here, it is desirable that a part of the screw hole be a dharma hole so that the cover member 74 is hooked on a screw temporarily fixed to the rear door 12. According to this, since the cover material 74 can be temporarily fixed to the rear door 12 during maintenance, the cover material 74 can be easily attached to and detached from the rear door 12.

  The cover member 74 includes a pair of handles 75 for handling the cover member 74. The handle 75 is attached to the substantially central edge of the cover member 74 in the height direction, and does not hinder ventilation. As shown in FIG. 5, the cover member 74 has an opening 76 at a position corresponding to the expansion valves 28 </ b> A and 28 </ b> B when the cover member 74 is attached to the rear door 12. This opening 76 is for maintaining the expansion valves 28A and 28B without removing the cover material 74. For example, the operation of the expansion valves 28A and 28B is confirmed, or the coil portion of the expansion valves 28A and 28B. Is defective, the coil portion can be exchanged through the opening 76.

Next, the operation of the multi-room type air conditioner 130 will be described.
(Cooling operation)
When the indoor units 105a and 105b perform cooling, the switching valves 109a and 119a of the outdoor heat exchangers 103a and 103b are opened and the other switching valves 109b and 119b are closed. In addition, the discharge side valves 116a and 116b are closed, and the suction side valves 117a and 117b are opened. Further, the outdoor fans 129a and 129b and the indoor fans 123a and 123b are set in a driving state, and the circulation pump 145 is stopped. In this case, the opening degree of the outdoor expansion valves 127a and 127b and the indoor expansion valves 118a and 118b is such that the temperature sensor S4 reaches a predetermined temperature, and the difference between the temperature detected by the temperature sensor S1 and the temperature detected by the temperature sensor S2 (= (Corresponding to the degree of superheat) is controlled to be a constant value. When the compressor 102 is driven in this state, the refrigerant discharged from the compressor 102 sequentially flows to the discharge pipe 107, the switching valves 109a and 119a, and the outdoor heat exchangers 103a and 103b, and then the outdoor expansion valves 127a and 127b. And flows into the liquid pipe 113, and is distributed to the indoor expansion valves 118a and 118b of the indoor units 105a and 105b to be decompressed. Thereafter, the refrigerant evaporates in the indoor heat exchangers 106a and 106b, flows through the suction side valves 117a and 117b, respectively, and then sucks into the compressor 102 through the low pressure gas pipe 112, the suction pipe 108, and the accumulator 104 in order. Is done. Thus, all the indoor units 105a and 105b are simultaneously cooled by the action of the indoor heat exchangers 106a and 106b functioning as evaporators.

(Heating operation)
When heating is performed in the indoor units 105a and 105b, one of the switching valves 109a and 119a of the outdoor heat exchangers 103a and 103b is closed and the other switching valve 109b and 119b is opened. In addition, the discharge side valves 116a and 116b are opened, and the suction side valves 117a and 117b are closed. The refrigerant discharged from the compressor 102 sequentially flows through the discharge pipe 107 and the high-pressure gas pipe 111 to the discharge-side valves 116a and 116b and the indoor heat exchangers 106a and 106b, where they are condensed and the indoor expansion valves 118a and 118a, It passes through 118b and is distributed to the indoor expansion valves 127a and 127b of the outdoor units 103a and 103b via the liquid pipe 113, where the pressure is reduced. Thereafter, the refrigerant evaporates in the outdoor heat exchangers 103a and 103b, flows through the switching valves 109b and 119b, respectively, and then is sucked into the compressor 102 through the low-pressure gas pipe 112, the suction pipe 108, and the accumulator 104 sequentially. . Thus, all the indoor units 105a and 105b are simultaneously heated by the condensation action of the indoor heat exchanges 106a and 106b.

(Cooling and heating mixed operation)
When performing the cooling operation and the heating operation simultaneously in different indoor units, for example, the indoor unit 105a performs cooling, the indoor unit 105b performs heating, and when the cooling load is larger than the heating load, the outdoor heat exchanger 103a, One switching valve 109a, 119a of 103b is opened and the other switching valve 109b, 119b is closed. Further, the discharge side valve 116a corresponding to the indoor unit 105a to be cooled is closed, and the suction side valve 117a is opened. Further, the discharge side valve 116b corresponding to the indoor unit 105b to be heated is opened, and the suction side valve 117b is closed. A part of the refrigerant discharged from the compressor 102 sequentially flows through the discharge pipe 107 and the switching valves 109a and 119a to the outdoor heat exchangers 103a and 103b, and flows into the liquid pipe 113 through the outdoor expansion valves 127a and 127b. The remaining refrigerant discharged from the compressor 102 flows through the high-pressure gas pipe 111 to the discharge side valve 116b and the indoor heat exchanger 106b corresponding to the indoor unit 105b for heating. Then, the indoor heat exchanger 106b and the outdoor heat exchanger 103 perform the condensation action. The refrigerant condensed in the indoor heat exchanger 106b and the outdoor heat exchanger 103 is reduced in pressure by the indoor expansion valve 118a of the indoor unit 105a through the liquid pipe 113, and then evaporated in each indoor heat exchanger 106a. Thereafter, the refrigerant flows through the suction side valve 117a, joins in the low pressure gas pipe 112, and is sucked into the compressor 102 through the suction pipe 108 and the accumulator 104 in this order. In this way, the indoor unit 105b is heated by the heat exchange action of the indoor heat exchanger 106b, the indoor unit 105a is cooled by the action of the other indoor heat exchanger 106a functioning as an evaporator, and the cooling / heating mixed operation is performed.

(Hot water storage operation)
When the hot water storage operation is performed, one of the switching valves 109a and 119a of the outdoor heat exchangers 103a and 103b is closed and the other switching valve 109b and 119b is opened. In addition, the discharge side valves 116a and 116b and the suction side valves 117a and 117b are closed. Further, the outdoor fans 129a and 129b are set in a driving state, the indoor fans 123a and 123b are set in a stopped state, and the circulation pump 145 is set in a driving state. Furthermore, the switching valve 148 that connects the high-pressure gas pipe 111 and the hot water storage heat exchanger 141 is opened. When the compressor 102 is driven in this state, a part of the refrigerant discharged from the compressor 102 is guided to the hot water storage heat exchanger 141 through the discharge pipe 107, the high-pressure gas pipe 111, and the switching valve 148. Then, in the hot water storage heat exchanger 141, the water passing through the water pipe 146 is heated, and the hot water is stored in the hot water storage tank 143. The hot water stored in the hot water storage tank 43 is sent to various facilities via a pipe not shown. The refrigerant after the heat exchange reaches the liquid pipe 113 via the expansion valve 147 and is distributed to the indoor expansion valves 127a and 127b of the outdoor units 103a and 103b, where the pressure is reduced.
Thereafter, the refrigerant evaporates in the outdoor heat exchangers 103a and 103b, flows through the switching valves 109b and 119b, respectively, and then is sucked into the compressor 102 through the low-pressure gas pipe 112, the suction pipe 108, and the accumulator 104 in order.

(Electronic equipment cooling operation)
When the electronic device cooling unit 20 performs the cooling operation of the electronic device, one of the switching valves 109a and 119a of the outdoor heat exchangers 103a and 103b is opened and the other switching valve 109b and 119b is closed. In addition, the valve 248 is opened and the valve 247 is opened.
When the compressor 102 is driven in this state, the refrigerant discharged from the compressor 102 sequentially flows to the discharge pipe 107, the switching valves 109a and 119a, and the outdoor heat exchangers 103a and 103b, and then the outdoor expansion valves 127a and 127b. And then flows into the liquid pipe 113 and reaches the evaporator 21 via the valve 247 of the electronic device cooling unit 20. The refrigerant evaporates in the evaporator 21, passes through the valve 248, and then is sucked into the compressor 102 through the low-pressure gas pipe 112, the suction pipe 108, and the accumulator 104 in order. As shown in FIG. 3, the evaporator 21 is provided in the rear door 12, and the air discharged from the electronic device 3 is cooled when it flows through the evaporator 21, and the cooled air is returned to the room. It is.

According to the present embodiment, it is possible to perform heating operation or hot water storage operation of another room using exhaust heat from the plurality of electronic devices 3.
(Heat storage operation using waste heat)
When performing the hot water storage operation using the exhaust heat from the electronic device 3, all the switching valves 109a, 119a, 109b, 119b of the outdoor heat exchangers 103a, 103b are closed and the valves 148, 147 of the hot water storage unit 150 are opened, The circulation pump 145 is set to a driving state. Further, the valves 247 and 248 of the electronic device cooling system 1 are opened.
When the compressor 102 is driven in this state, the refrigerant discharged from the compressor 102 is guided to the hot water storage heat exchanger 141 through the discharge pipe 107, the high-pressure gas pipe 111, and the switching valve 148. Then, in the hot water storage heat exchanger 141, the water passing through the water pipe 146 is heated, and the hot water is stored in the hot water storage tank 143. The refrigerant reaches the liquid pipe 113 through the expansion valve 147, passes through the valve 247, flows into the evaporator 21 of the electronic device cooling unit 20, evaporates and vaporizes through the valve 248, and then passes through the valve 248. The suction pipe 108 and the accumulator 104 are sequentially sucked into the compressor 102. As shown in FIG. 3, the evaporator 21 is provided in the rear door 12, and the air discharged from the electronic device 3 is cooled when it flows through the evaporator 21, and the cooled air is returned to the room. It is.
According to this configuration, the exhaust heat of the electronic device 3 is absorbed, and this is dissipated by the hot water storage heat exchanger 141, thereby enabling hot water storage.

(Heating operation using waste heat)
When performing the heating operation using the exhaust heat from the electronic device 3, all the switching valves 109a, 119a, 109b, 119b of the outdoor heat exchangers 103a, 103b are closed and the discharge side valves 116a of the indoor units 105a, 105b are closed. 116b is opened, and the suction side valves 117a and 117b are closed. Further, the indoor fans 123a and 123b are set in a driving state. Further, the valves 247 and 248 of the electronic device cooling system 1 are opened.
When the compressor 102 is driven in this state, the refrigerant discharged from the compressor 102 flows into the indoor heat exchangers 106a and 106b via the discharge pipe 107, the high-pressure gas pipe 111, and the discharge side valves 116a and 116b. Then, the water is condensed and heated, and then passes through the indoor expansion valves 118 a and 118 b and flows into the liquid pipe 113. Thereafter, the refrigerant passes through the valve 247 connected to the liquid pipe 113 and flows to the evaporator 21 of the electronic device cooling unit 20, where it evaporates and passes through the valve 248, and then the low-pressure gas pipe 112 and the suction pipe. 108 and the accumulator 104 are sequentially sucked into the compressor 102. As shown in FIG. 3, the evaporator 21 is provided in the rear door 12, and the air discharged from the electronic device 3 is cooled when it flows through the evaporator 21, and the cooled air is returned to the room. It is.
According to this configuration, the exhaust heat of the electronic device 3 is absorbed, and this is radiated by the indoor heat exchangers 106a and 106b, thereby enabling heating.

  In the present embodiment, the operation control of the electronic device cooling unit 20 is prioritized over the operation control of the multi-room air conditioner 130 or the hot water storage unit 150. The electronic device cooling unit 20 includes a sensor 200 (see FIG. 3) that detects the exhaust heat temperature of the electronic device 3, and the sensor 200 is connected to the electrical unit 51 (see FIG. 5). The electrical unit 51 controls the rotation speed of the compressor 102 so that the temperature detected by the sensor 200 falls within a predetermined range. In this configuration, during the electronic device cooling operation by the electronic device cooling unit 20, the heating operation or hot water storage operation of the other room using the exhaust heat from the plurality of electronic devices 3 is executed as described above. In the present embodiment, when the heating operation or the hot water storage operation of these other rooms is executed, the detected temperature of the sensor 200 that detects the exhaust heat temperature of the electronic device 3 is changed to the other indoor heat exchangers 106a and 106b or The rotational speed of the compressor 102 can be controlled in preference to the temperature detected by the hot water storage heat exchanger 141. According to this, although the operation control in the multi-room type air conditioner 130 or the hot water storage unit 150 is sacrificed, the operation of the electronic device cooling unit 20 is prioritized and maintained almost reliably, and the electronic device 3 is securely connected. Can be cooled.

  According to this configuration, the cabinet 11 having front and rear surfaces opened to accommodate the plurality of electronic devices 3 with the fans 4 is provided. The rear opening 65 of the cabinet 11 includes the rear door 12 that can be ventilated. Since the evaporator 21 constituting the refrigeration cycle, the expansion valves 28A and 28B, and the electric unit 51 for controlling the expansion valve are integrally provided, the evaporator 21, the expansion valves 28A and 28B, and the electric unit 51 are integrated into one unit. The electronic device cooling unit 20 can be handled. By connecting the electronic device cooling unit 20 to the outdoor unit 100 constituting the refrigeration cycle, the heat generated by the electronic device 3 can be easily cooled. Moreover, since the refrigerant | coolant which circulates through a refrigerating cycle is supplied to the evaporator 21 arrange | positioned at the rear door 12, even if a leak arises from the path | route through which a refrigerant | coolant circulates, the electronic device 3 is short-circuited by this refrigerant | coolant. Damage such as electric leakage can be prevented. Further, since the air blown by the fan 4 is cooled by the evaporator 21 of the rear door 12 and returned to the room, the room temperature may rise excessively due to the heat generated by the electronic device 3 or a temperature distribution may occur in the room. Is prevented. Therefore, according to this embodiment, the electronic device 3 can be effectively cooled without using water.

  In addition, according to this configuration, the evaporator 21 is arranged in substantially the entire area of the rear door 12, and the liquid pipe 27, the gas pipe 29, and the expansion valves 28 A and 28 B provided in the liquid pipe 27 are connected to the evaporator 21. Since the electric equipment unit 51 is arranged on the lower side of the rear door 12, the evaporator 21, the expansion valves 28 </ b> A and 28 </ b> B, and the electric equipment unit 51 can be arranged on the rear door 12 together. Furthermore, since the electrical unit 51 is disposed below the rear door 12, that is, below the evaporator 21, a part of the air cooled by the evaporator 21 is lowered to cool the electrical unit 51. For this reason, it is not necessary to separately provide a device for cooling the electrical unit 51, and the configuration of the electrical unit 51 can be simplified.

  Further, according to the present embodiment, since the caster 13 that allows the cabinet 11 to move is attached to the bottom of the cabinet 11, for example, the layout of the cabinet 11 is changed in the computer room 2. However, this change operation can be easily performed.

It is a refrigerant circuit figure concerning one embodiment of the present invention. It is a figure which shows the electronic device cooling system which concerns on one Embodiment of this invention. It is a figure which shows a server rack. It is an external appearance perspective view of a server rack. It is a perspective view of the server rack of the state which opened the rear door. It is a perspective view which shows the state which removed the cover material from FIG. It is a perspective view which shows the structure of an evaporator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device cooling system 2 Computer room 3 Electronic device 10 Server rack 11 Cabinet 12 Rear door 20 Electronic device cooling unit 21 Evaporator 100 Outdoor unit 102 Compressor 103a, 103b Outdoor heat exchanger 105a, 105b Indoor unit 106a, 106b Indoor heat exchange 110 Inter-unit piping 111 High-pressure gas pipe 112 Low-pressure gas pipe 113 Liquid pipe 118a, 118b Indoor expansion valve 127a, 127b Outdoor expansion valve 130 Multi-room air conditioner 141 Heat exchanger for hot water storage 143 Hot water storage tank 145 Circulation pump 150 Hot water storage unit

Claims (3)

An outdoor unit having a compressor and an outdoor heat exchanger and a plurality of indoor units having an indoor heat exchanger are connected by inter-unit piping, and one end of the outdoor heat exchanger is connected to a refrigerant discharge pipe of the compressor And a refrigerant suction pipe, wherein the inter-unit pipe is connected to the refrigerant discharge pipe, a high-pressure gas pipe connected to the refrigerant suction pipe, a low-pressure gas pipe connected to the refrigerant suction pipe, and the outdoor heat exchanger The other end of the indoor heat exchanger is connected to the high-pressure gas pipe and the low-pressure gas pipe, and the other end is connected to the liquid pipe. A multi-room type air conditioner configured to be capable of cooling operation or heating operation at the same time, or a mixture of these cooling operation and heating operation,
A cabinet having front and rear openings for storing a plurality of electronic devices with fans is provided, a rear door capable of ventilation is provided at the rear opening of the cabinet, and an evaporator constituting a refrigeration cycle is provided inside the rear door. An electronic device cooling device configured to cool the air including exhaust heat of the electronic device blown by the fan and return the air to the room by the evaporator,
One end of the evaporator of the electronic device cooling apparatus is connected to the low-pressure gas pipe of the multi-room type air conditioning apparatus, and the other end is connected to the liquid pipe.   A sensor for detecting an exhaust heat temperature of the electronic device is provided, and the rotation speed of the compressor is controlled by giving priority to the detected temperature of the sensor over the detected temperature of another indoor heat exchanger. Item 2. The air conditioning system according to Item 1. The exhaust heat of the electronic device is absorbed by the evaporator,
The air conditioning system according to claim 1 or 2, wherein the air conditioning system can be used for heating operation of the multi-room type air conditioner.

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