JP2022039608A - Air-conditioning system for computer rom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system for a computer room capable of reducing the possibility of combustion of a leaked refrigerant while suppressing a temperature rise in the computer room.
SOLUTION: This is an air conditioning system for a computer room that harmonizes the air in the computer room, and has a first air conditioner having an outdoor unit and an indoor unit, and a first air conditioner having an outdoor unit and an indoor unit. The first air conditioner includes a second air conditioner having a different refrigerant system from the above, and the first air conditioner has a variable speed compressor, a constant speed compressor, and a first indoor fan provided in the indoor unit, and has a second. The air conditioner has a variable speed compressor and a constant speed compressor, and the plurality of indoor units perform air conditioning for the same computer room, and the leakage condition regarding the leakage of the refrigerant in the second air conditioner. When the above conditions are satisfied, the operation of the variable speed compressor and the constant speed compressor is stopped, and the variable speed compressor or the constant speed compressor and the first chamber fan are in the operating state.
[Selection diagram] FIG. 6

Description

Regarding the air conditioning system for the computer room.

Conventionally, in a server room or the like in which a plurality of computers such as servers as multiple information processing devices are arranged, an air conditioner for a computer room that cools the room so that the temperature of each computer does not rise too much. Is used.

As a system using such an air conditioner, for example, as described in Patent Document 1 (Japanese Unexamined Patent Publication No. 11-063636), a system for cooling the same computer room using a plurality of air conditioners. Has been proposed.

When a refrigerant leaks in a system using such a plurality of air conditioners, not only the combustion of the leaked refrigerant in the computer room is suppressed, but also the temperature rise in the computer room is suppressed. Is also required.

An object of the present-disclosed air-conditioning system for a computer room is to reduce the possibility that the leaked refrigerant burns while suppressing the temperature rise in the computer room.

The air conditioning system for a computer room according to the first aspect is an air conditioning system for a computer room that harmonizes the air in the computer room, and includes a first air conditioner and a second air conditioner. The first air conditioner has a first outdoor unit and a first indoor unit. The second air conditioner has a second outdoor unit and a second indoor unit. The second air conditioner has a different refrigerant system from the first air conditioner. The first air conditioner has a first compressor and a first fan provided in the first indoor unit. The second air conditioner has a second compressor. The first indoor unit and the second indoor unit perform air conditioning for the same computer room. When the leakage condition relating to the leakage of the refrigerant in the second air conditioner is satisfied, the operation of the second compressor is stopped, and the first compressor and the first fan are in the operating state.

The first air conditioner and the second air conditioner may be controlled by a control unit.

In the first air conditioner, the first indoor unit may have the first compressor. Further, in the second air conditioner, the second indoor unit may have a second compressor.

If the first compressor and the first fan are in the operating state when the leakage condition regarding the leakage of the refrigerant in the second air conditioner is satisfied, the operation is maintained without stopping.

In this computer room air conditioning system, a refrigerant that may be flammable is used, and even if the refrigerant leaks from the second air conditioner, the first compressor of the first air conditioner is in the operating state. As a result, the temperature rise in the computer room is suppressed. Further, by stopping the operation of the second compressor, an increase in the amount of the refrigerant leaking from the second air conditioner is suppressed. Further, by putting the first fan of the first air conditioner in the operating state, it becomes possible to diffuse the refrigerant leaked to the computer room while suppressing the temperature rise in the computer room. This makes it possible to reduce the possibility of combustion of the leaked refrigerant while suppressing the temperature rise in the computer room.

The air conditioning system for the computer room according to the second aspect is the air conditioning system for the computer room according to the first aspect, and the second air conditioner has a second fan provided in the second indoor unit. When the leakage condition is satisfied, the second fan is in the operating state.

In this air conditioning system for the computer room, the refrigerant leaked to the computer room can be further diffused by putting the second fan into the operating state.

The air-conditioning system for the computer room according to the third aspect is the air-conditioning system for the computer room according to the second aspect, and when the leakage condition is satisfied, the air volume of the second fan increases.

This air conditioning system for the computer room can further diffuse the refrigerant leaked to the computer room.

The air-conditioning system for a computer room according to the fourth aspect is the air-conditioning system for the computer room from any one of the first to third viewpoints, and the second outdoor unit has a refrigerant receiver. .. When the leakage condition is satisfied, the second air conditioner operates to recover the refrigerant contained in the second air conditioner to the liquid receiver. The second air conditioner stops the operation of the second compressor after performing the operation of collecting the refrigerant in the liquid receiver.

In this computer room air conditioning system, even if the refrigerant leaks in the second air conditioner, the refrigerant in the second air conditioner is recovered in the receiver of the second outdoor unit. Therefore, an increase in the amount of refrigerant leaking from the second air conditioner toward the computer room is suppressed.

The air-conditioning system for the computer room according to the fifth aspect is the air-conditioning system for the computer room from any one of the first to the fourth viewpoints, and satisfies the leakage condition in the state where the first compressor is stopped. In that case, the first compressor starts to drive.

In this air conditioning system for a computer room, even if the first air conditioner is in an operation stopped state when the refrigerant leaks from the second air conditioner, the operation of the first air conditioner is started by starting the operation of the computer room. It becomes possible to suppress the temperature rise.

The air conditioning system for a computer room according to the sixth aspect is an air conditioning system for a computer room that harmonizes the air in the computer room, and includes a first air conditioner and a second air conditioner. The first air conditioner has a first outdoor unit and a first indoor unit. The second air conditioner has a second outdoor unit and a second indoor unit. The second air conditioner has a different refrigerant system from the first air conditioner. The first air conditioner has a first compressor and a first fan provided in the first indoor unit. The second air conditioner has a second compressor and a second fan provided in the second indoor unit. The first indoor unit and the second indoor unit perform air conditioning for the same computer room. When the first leakage condition regarding the leakage of the refrigerant in the first air conditioner is satisfied, the operation of the first compressor is stopped, and the second compressor and the second fan are in the operating state. When the second leakage condition relating to the leakage of the refrigerant in the second air conditioner is satisfied, the operation of the second compressor is stopped, and the first compressor and the first fan are in the operating state.

The first air conditioner and the second air conditioner may be controlled by a control unit.

In the first air conditioner, the first indoor unit may have the first compressor. Further, in the second air conditioner, the second indoor unit may have a second compressor.

If the first compressor and the first fan are in the operating state when the leakage condition regarding the leakage of the refrigerant in the second air conditioner is satisfied, the first compressor and the first fan are not stopped. It will keep the operation. Further, if the second compressor and the second fan are in the operating state at the time when the leakage condition regarding the leakage of the refrigerant in the first air conditioner is satisfied, the second compressor and the second fan are not stopped. It will keep the operation.

In this computer room air conditioning system, a refrigerant that may be flammable is used, and even if the refrigerant leaks from the second air conditioner, the first compressor of the first air conditioner is in the operating state. As a result, the temperature rise in the computer room is suppressed. Further, by stopping the operation of the second compressor, an increase in the amount of the refrigerant leaking from the second air conditioner is suppressed. Further, by putting the first fan of the first air conditioner in the operating state, it becomes possible to diffuse the refrigerant leaked to the computer room while suppressing the temperature rise in the computer room.

Further, even if a refrigerant having a possibility of flammability is used and the refrigerant leaks from the first air conditioner, the second compressor of the second air conditioner is put into an operating state, so that the computer room can be used. The temperature rise is suppressed. Further, by stopping the operation of the first compressor, an increase in the amount of the refrigerant leaking from the first air conditioner is suppressed. Further, by setting the second fan of the second air conditioner to the operating state, it is possible to diffuse the refrigerant leaked to the computer room while suppressing the temperature rise in the computer room.

This makes it possible to reduce the possibility of combustion of the leaked refrigerant while suppressing the temperature rise in the computer room.

It is a schematic block diagram of the air conditioning system for a computer room. It is a block block diagram of the air-conditioning system for a computer room. It is a front view arrangement configuration diagram of the 1st air conditioner. It is a right side view arrangement block diagram of the 1st air conditioner. It is a plan view arrangement composition figure in the lower space of the 1st air conditioner. It is a control flowchart at the time of refrigerant leakage.

Hereinafter, the air conditioning system for the computer room will be specifically described with reference to examples, but these descriptions are not limited to the contents of the present disclosure.

(1) Air conditioning system 100 for computer room
FIG. 1 shows an overview configuration diagram of the air conditioning system 100 for a computer room. FIG. 2 shows a block configuration diagram of the air conditioning system 1 for the computer room. FIG. 3 shows a front view layout configuration diagram of the first air conditioner 1a. FIG. 4 shows a right side view layout configuration diagram of the first air conditioner 1a. FIG. 5 shows a plan view layout configuration diagram in the lower space of the first air conditioner 1a. The arrows in FIGS. 3, 4, and 5 indicate the air flow during operation.

The computer room air conditioning system 100 includes a first air conditioner 1a, a second air conditioner 1b, and a management device 80.

The first air conditioner 1a and the second air conditioner 1b have different refrigerant systems that are independent of each other, and air-conditions the same computer room R1. The computer room R1 is a room in which computers such as a plurality of servers are arranged, and is mainly a space in which a cooling load is generated. The computer room R1 has an underfloor space under the floor on which a computer or the like is arranged.

In the present embodiment, a combustible refrigerant is used for each of the first air conditioner 1a and the second air conditioner 1b. Specifically, as combustible refrigerants, a refrigerant having a combustion rate of 10 cm / s or less in the worst case of formulation for flammability (WCF) according to the US ANSI / ASHRAE34-2013 standard, and a combustion rate of WCF. Worst case of fractionation for flammability, which is less than 10 cm / s and is identified by leak testing during storage, transportation, and use based on ANSI / ASHRAE34-2013 using WCF. WCFF) has a combustion rate of 10 cm / s or less, and includes refrigerants whose flammability classification of the US ANSI / ASHRAE34-2013 standard is judged to be "2L class". Typically, an R32 refrigerant is used for the first air conditioner 1a and the second air conditioner 1b.

The first air conditioner 1a and the second air conditioner 1b have a first control unit 7a and a second control unit 7b, which will be described later, respectively. The first control unit 7a of the first air conditioner 1a and the second control unit 7b of the second air conditioner 1b are connected to a management device 80 that functions as a higher-level controller via a communication line. The management device 80 is arranged in the management room R2, which is a room separate from the computer room R1. The management device 80 includes a processor such as a CPU that receives input from an input unit (not shown) and performs predetermined information processing, and a memory having a ROM or RAM.

(2) First air conditioner 1a
The first air conditioner 1a is a device for air-conditioning the computer room R1, and includes an indoor unit 2a, an outdoor unit 3a, a gas side connecting pipe 8a and a liquid side connecting pipe 9a connecting them, and a first air conditioner 1a. It has a control unit 7a and. Further, in the first air conditioner 1a, the components arranged in the indoor unit 2a, the components arranged in the outdoor unit 3a, and the gas side connecting pipe 8a and the liquid side connecting pipe 9a are connected to each other. It has a refrigerant circuit 10a configured by the above.

The indoor unit 2a is installed in the computer room R1. The outdoor unit 3a is installed outdoors. The refrigerant circulating inside the refrigerant circuit 10a exchanges heat with the air in the computer chamber R1 on the indoor unit 2a side to absorb heat, and exchanges heat with the outside air on the outdoor unit 3a side to dissipate heat. do.

The floor of the computer room R1 has an opening for passing the conditioned air from the indoor unit 2a and an opening for supplying the conditioned air from the underfloor space to the above-floor space. The conditioned air supplied from the indoor unit 2a is blown out into the underfloor space and then flows from the underfloor space to the above-floor space to lower the temperature of the air around the computer and the like.

The first control unit 7a is configured by connecting the first indoor control unit 5a provided in the indoor unit 2a and the first outdoor control unit 6a provided in the outdoor unit 3a by a communication line. ..

(2-1) Indoor unit 2a
The indoor unit 2a mainly includes a variable speed compressor 11a, a constant speed compressor 12a, an indoor heat exchanger 18a, an indoor expansion valve 17a, a pressure equalizing circuit 15a, a low pressure side main pipe 28a, and a high pressure side main. It has a pipe 29a, a first indoor fan 20a, and a first indoor control unit 5a.

The variable speed compressor 11a and the constant speed compressor 12a are connected in parallel to each other in the refrigerant circuit 10a. As these compressors, for example, a fully enclosed scroll compressor can be used. The variable speed compressor 11a is a compressor capable of controlling the rotation speed. The constant speed compressor 12a is a compressor controlled to either an operating state or a stopped state at a constant rotation speed.

The indoor expansion valve 17a is provided in a portion of the refrigerant circuit 10a that connects the liquid side connecting pipe 9a and the indoor heat exchanger 18a. The indoor expansion valve 17a is not particularly limited and may be a capillary tube, but in the present embodiment, an electronic expansion valve whose valve opening degree is adjusted by pulse control of a stepping motor is used.

The indoor heat exchanger 18a is a cross-fin coil type heat exchanger and functions as a refrigerant evaporator.

The first indoor fan 20a supplies an air flow to the indoor heat exchanger 18a, and has a fan 21a, a fan 22a, and a fan motor 23a. The air volume of the first indoor fan 20a can be adjusted by controlling the rotation speed of the fan motor 23a. The fan 21a and the fan 22a have a common rotation shaft extending from the fan motor 23a.

The low-pressure side main pipe 28a is a refrigerant pipe extending from a portion of the indoor heat exchanger 18a opposite to the indoor expansion valve 17a side.

The high-pressure side main pipe 29a is a refrigerant pipe connected to the gas side connecting pipe 8a.

The end of the low-pressure side main pipe 28a opposite to the indoor heat exchanger 18a side and the end of the high-pressure side main pipe 29a opposite to the gas side connecting pipe 8a side are variable speeds extending in parallel with each other. The side circuit 40a and the constant speed side circuit 41a are connected to each other.

A variable speed compressor 11a is provided in the middle of the variable speed side circuit 40a. A variable speed oil separator 46a is provided on the discharge side of the variable speed compressor 11a in the variable speed side circuit 40a. The variable speed bypass circuit 42a extends from the variable speed oil separator 46a and is connected to the suction side of the constant speed compressor 12a in the constant speed side circuit 41a. A capillary tube 44a as a depressurizing means is provided in the middle of the variable speed bypass circuit 42a. A check valve 48a is provided on the high-pressure side main pipe 29a side of the variable-speed oil separator 46a in the variable-speed side circuit 40a to allow only the refrigerant flow toward the high-pressure side main pipe 29a.

A constant speed compressor 12a is provided in the middle of the constant speed side circuit 41a. A constant speed oil separator 47a is provided on the discharge side of the constant speed compressor 12a in the constant speed side circuit 41a. The constant speed bypass circuit 43a extends from the constant speed oil separator 47a and is connected to the suction side of the variable speed compressor 11a in the variable speed side circuit 40a. A capillary tube 45a as a depressurizing means is provided in the middle of the constant speed bypass circuit 43a. A check valve 49a is provided on the high-pressure side main pipe 29a side of the constant-speed oil separator 47a in the constant-speed side circuit 41a to allow only the refrigerant flow toward the high-pressure side main pipe 29a.

The pressure equalizing circuit 15a extends so as to branch from between the variable speed oil separator 46a and the check valve 48a in the variable speed side circuit 40a, and is connected in the middle of the low pressure side main pipe 28a. A pressure equalizing valve 16a is provided in the middle of the pressure equalizing circuit 15a. The pressure equalizing valve 16a is not particularly limited and may be an expansion valve whose opening degree can be adjusted, but an on-off valve is used in this embodiment. The pressure equalizing valve 16a is a valve that is open-controlled for pressure equalization when either drive is started from a state in which both the variable speed compressor 11a and the constant speed compressor 12a are stopped.

The indoor unit 2a includes a first refrigerant leakage sensor 13a and various sensors such as a low pressure sensor 26a, a high pressure sensor 27a, and an indoor temperature sensor 14a. These sensors are connected in such a manner that the detected value is transmitted to the first chamber control unit 5a. The first refrigerant leakage sensor 13a is arranged in the vicinity of the indoor heat exchanger 18a in the housing 50 described later of the indoor unit 2a, and detects the refrigerant leaked from the refrigerant circuit 10a of the first air conditioner 1a. The low pressure sensor 26a detects the pressure of the refrigerant flowing through the low pressure side main pipe 28a. The high pressure sensor 27a detects the pressure of the refrigerant flowing through the high pressure side main pipe 29a. The indoor temperature sensor 14a detects the indoor temperature, which is the temperature of the air taken into the indoor unit 2a from the computer chamber R1. Specifically, the indoor temperature sensor 14a detects the temperature of the air taken into the indoor unit 2a before passing through the indoor heat exchanger 18a.

The first room control unit 5a includes a processor such as a CPU that receives signals from various sensors, a remote controller (not shown), and the like to perform predetermined information processing, and a memory having a ROM and RAM. .. In the memory, a set temperature or the like input from a remote controller or the like (not shown) is recorded.

(2-2) Outdoor unit 3a
The outdoor unit 3a mainly includes an outdoor heat exchanger 31a, an outdoor expansion valve 32a, a first liquid receiver 35a, a first outdoor fan 37a, and a first outdoor control unit 6a.

The outdoor heat exchanger 31a is connected to a refrigerant pipe extending from the gas side connecting pipe 8a. The outdoor heat exchanger 31a is a cross-fin coil type heat exchanger, and functions as a radiator or a condenser of the refrigerant.

The outdoor expansion valve 32a is provided in the middle of the refrigerant pipe extending to the side opposite to the gas side connecting pipe 8a side of the outdoor heat exchanger 31a. The outdoor expansion valve 32a is not particularly limited and may be a capillary tube, but in the present embodiment, an electronic expansion valve whose valve opening degree is adjusted by pulse control of a stepping motor is used.

The first liquid receiver 35a is provided between the side of the outdoor expansion valve 32a opposite to the outdoor heat exchanger 31a side and the liquid side connecting pipe 9a, and stores excess refrigerant in the refrigerant circuit 10a. Can be done.

The first outdoor fan 37a supplies an air flow to the outdoor heat exchanger 31a, and is, for example, a propeller fan.

The outdoor unit 3a includes various sensors such as an outdoor temperature sensor 36a. These sensors are connected in such a manner that the detected value is transmitted to the first outdoor control unit 6a. The outdoor temperature sensor 36a detects the outside air temperature.

The first outdoor control unit 6a includes a processor such as a CPU that receives signals from various sensors, a remote controller (not shown), and the like to perform predetermined information processing, and a memory having a ROM and RAM. ..

The first outdoor control unit 6a constitutes a first control unit 7a that controls the first air conditioner 1a by being connected to the first indoor control unit 5a via a communication line.

The first control unit 7a is connected to the management device 80 and the second control unit 7b, which will be described later, via a communication line.

(3) Second air conditioner 1b
The second air conditioner 1b is a device that performs air conditioning in the computer room R1 in the same manner as the first air conditioner 1a.

The second air conditioner 1b has an indoor unit 2b, an outdoor unit 3b, a gas side connecting pipe 8b and a liquid side connecting pipe 9b connecting them, and a second control unit 7b. Further, in the second air conditioner 1b, the components arranged in the indoor unit 2b, the components arranged in the outdoor unit 3b, and the gas side connecting pipe 8b and the liquid side connecting pipe 9b are connected to each other. It has a refrigerant circuit 10b configured by the above.

The indoor unit 2b is the same as the indoor unit 2a, and mainly includes a variable speed compressor 11b, a constant speed compressor 12b, an indoor heat exchanger 18b, an indoor expansion valve 17b, a pressure equalizing circuit 15b, and a low pressure side. The main pipe 28b, the high pressure side main pipe 29b, the second indoor fan 20b having the fan 21b, the fan 22b and the fan motor 23b, the second refrigerant leakage sensor 13b, the low pressure sensor 26b, the high pressure sensor 27b, and the room temperature. It has a sensor 14b and a second chamber control unit 5b. The indoor unit 2b is arranged adjacent to the indoor unit 2a in the computer room R1. Similar to the indoor unit 2a, the variable speed side circuit 40b is provided with a variable speed compressor 11b, a variable speed oil separator 46b, and a check valve 48b, and the constant speed side circuit 41b is provided with a constant speed compressor. A 12b, a constant speed oil separator 47b, and a check valve 49b are provided. The variable speed bypass circuit 42b extends from the variable speed oil separator 46b and is connected to the suction side of the constant speed compressor 12b via the capillary tube 44b. The constant speed bypass circuit 43b extends from the constant speed oil separator 47b and is connected to the suction side of the variable speed compressor 11b via the capillary tube 45b. The pressure equalizing circuit 15b has a pressure equalizing valve 16b, and connects the high pressure side of the variable speed side circuit 40b and the middle of the low pressure side main pipe 28b. The second refrigerant leakage sensor 13b is arranged in the vicinity of the indoor heat exchanger 18b in the indoor unit 2b, and detects the refrigerant leaked from the refrigerant circuit 10b of the second air conditioner 1b.

The outdoor unit 3b is the same as the outdoor unit 3a, and mainly includes an outdoor heat exchanger 31b, an outdoor expansion valve 32b, a second liquid receiver 35b, a second outdoor fan 37b, an outdoor temperature sensor 36b, and a second unit. It has two outdoor control units 6b.

The second outdoor control unit 6b constitutes a second control unit 7b that controls the second air conditioner 1b by being connected to the second indoor control unit 5b via a communication line. The second control unit 7b is connected to the management device 80 and the first control unit 7a via a communication line.

The detailed configuration of the second air conditioner 1b is the same as that of the first air conditioner 1a because the subscript "a" of the reference code of each element of the first air conditioner 1a is replaced with "b". , The explanation is omitted.

(4) Structure of Indoor Unit 2a The detailed structure of the indoor unit 2a will be described below. Since the detailed structure of the indoor unit 2b is the same as that of the indoor unit 2a, the description thereof will be omitted.

The indoor unit 2a is a floor-standing air conditioner installed on the floor surface of the computer room R1 and has a housing 50 for accommodating various components. The housing 50 has a substantially rectangular parallelepiped shape, and has a top panel 51, a bottom panel 52, a front panel 53, a back panel 54, a left side panel 55, a right side panel 56, and the like, which are plate-shaped, respectively. ing. The directions of the indoor unit 2 up, down, left, right, front and back correspond to the names of these panels. The top panel 51 is provided with a suction port 51a in which the air filter 24 is arranged. The bottom panel 52 is formed with an outlet 52a and an outlet 52b.

Inside the housing 50, a mechanical space S1 in which a variable speed compressor 11a, a constant speed compressor 12a, a variable speed oil separator 46a, a constant speed oil separator 47a, etc. are arranged, a first chamber control unit 5a, etc. It is partitioned into an arranged control space S2 and a ventilation space S3 in which an indoor heat exchanger 18a, a drain pan 25, a first indoor fan 20a, and the like are arranged.

The mechanical space S1 is located below the front side of the internal space of the housing 50 and is located near the center in the left-right direction. In the machine space S1, the rear side, the right side, the left side, and the upper side are partitioned by the machine partition portion 57.

The control space S2 is located on the front side of the internal space of the housing 50, above the machine space S1, and covers the entire area in the left-right direction. In the control space S2, the rear side, the right side, the left side, and the lower side are partitioned by the control partition portion 58.

The ventilation space S3 is the remaining space inside the housing 50 other than the machine space S1 and the control space S2 described above, and the air taken in through the suction port 51a reaches the outlet 52a and the outlet 52b. It is an area that flows up to. A drain pan 25 is provided at the lower end portion of the indoor heat exchanger 18a arranged in a V shape when viewed from the side. The front side and the rear side of the drain pan 25 are flow paths through which the downward air flow passes. A first indoor fan 20a is provided in the lower space below the drain pan 25 in the ventilation space S3.

The fan 21a of the first indoor fan 20a is connected to a rotating shaft extending from the fan motor 23a toward the left side. The fan 21a is provided with a left side suction port 60a and a right side suction port 60b, and has a fan casing 60 having an opening overlapping with the air outlet 52a of the bottom panel 52, and an impeller 61. The impeller 61 is a double suction turbofan that enables suction from both directions in the rotation axis direction. The air blown out from the impeller 61 in the circumferential direction is blown out toward the underfloor space through the air outlet 52a located at the bottom of the fan casing 60.

The fan 22a of the first indoor fan 20a is connected to a rotating shaft extending from the fan motor 23a toward the right side. The fan 22a is provided with a right side suction port 70a, and has a fan casing 70 having an opening overlapping with the air outlet 52b of the bottom panel 52, and an impeller 71. The impeller 71 is a single-suction turbofan that enables suction from one side in the direction of the rotation axis. The air blown out from the impeller 71 in the circumferential direction is blown out toward the underfloor space through the air outlet 52b located at the bottom of the fan casing 70.

(5) Control Hereinafter, a control flowchart of the first air conditioner 1a and the second air conditioner 1b will be described with reference to FIG. 6 when a refrigerant leak occurs in the second air conditioner 1b during operation of the second air conditioner 1b. do.

In the computer room air conditioning system 100 of the present embodiment, the second air conditioner 1b is used as an air conditioner for normal operation, and the first air conditioner 1a is used as a backup air conditioner. Specifically, the first air conditioner 1a is driven in a special case such as when the refrigerant leaks in the second air conditioner 1b or when the second air conditioner 1b fails, and the second air conditioner 1b operates normally. During the operation, the operation is stopped.

In step S10, the second control unit 7b controls the second air conditioner 1b to operate normally. Specifically, the second control unit 7b compresses at a variable speed so that the temperature of the refrigerant flowing through the indoor heat exchanger 18b becomes the target evaporation temperature based on the detection temperature of the indoor temperature sensor 14b and a predetermined set temperature. It controls the frequency of the machine 11b and controls the drive or stop of the constant speed compressor 12b. Further, the second control unit 7b controls the valve opening degree of the indoor expansion valve 17b so that the degree of superheat of the refrigerant sucked by the variable speed compressor 11b or the constant speed compressor 12b becomes a predetermined degree of superheat. The second control unit 7b controls the valve opening degree of the outdoor expansion valve 32b so as to be fully opened. The second control unit 7b drives the second outdoor fan 37b and controls it so that the set air volume becomes a predetermined value. The second control unit 7b drives the second indoor fan 20b and controls it so that the air volume becomes a predetermined set air volume. The set air volume of the second indoor fan 20b can be a predetermined air volume according to the degree of difference between the air temperature of the computer room R1 and the set temperature. As a result, the computer room R1 is cooled. Here, when the temperature detected by the room temperature sensor 14b as the air temperature of the computer room R1 is equal to or lower than the set temperature, the second control unit 7b may use the variable speed compressor 11b, the constant speed compressor 12b, and the like. The drive of the second indoor fan 20b and the second outdoor fan 37b is stopped. Then, after a lapse of a predetermined time, if the air temperature in the computer room R1 is higher than the value obtained by adding the predetermined value to the set temperature, the variable speed compressor 11b and / or the constant speed compressor 12b, the second room. The operation of the fan 20b and the second outdoor fan 37b is restarted.

In the present embodiment, the first air conditioner 1a is used as a backup air conditioner. Therefore, the first air conditioner 1a is kept in the stopped state while the second air conditioner 1b is in normal operation. Specifically, the operation stop state of the first air conditioner 1a is a state in which at least both the variable speed compressor 11a and the constant speed compressor 12a are stopped.

In step S11, the second control unit 7b determines whether or not the second refrigerant leakage sensor 13b has detected the leakage of the refrigerant from the second air conditioner 1b. Here, when the second refrigerant leakage sensor 13b detects the leakage of the refrigerant, the process proceeds to step S12. If the second refrigerant leakage sensor 13b does not detect the leakage of the refrigerant, step S10 is continued.

In step S12, the second control unit 7b reports to the management device 80 that the refrigerant leakage has occurred in the second air conditioner 1b by communication via the communication line. In response to this, the management device 80 notifies that a refrigerant leak has occurred in the second air conditioner 1b on a display or the like (not shown). Further, the second control unit 7b controls the air volume of the second indoor fan 20b to a predetermined maximum air volume while continuing the operation of the second indoor fan 20b. If the air volume of the second indoor fan 20b has already reached a predetermined maximum air volume, the maximum air volume is maintained. If the second indoor fan 20b is stopped due to the computer room R1 being below the set temperature, the second control unit 7b restarts the operation of the second indoor fan 20b, and the maximum air volume is reached. It is controlled so as to be. As a result, the leaked refrigerant in the computer room R1 can be diffused. Then, the second control unit 7b starts a pump-down operation in which the refrigerant in the refrigerant circuit 10b of the second air conditioner 1b is collected in the second receiver 35b. In the pump down operation, the second control unit 7b operates the constant speed compressor 12b while controlling the indoor expansion valve 17b to the fully closed state, controls the variable speed compressor 11b to the maximum frequency, and controls the outdoor expansion valve 32b. Is controlled to the fully open state, and the air volume of the second outdoor fan 37b is controlled to a predetermined maximum air volume. As a result, the refrigerant condensed in the outdoor heat exchanger 31b is collected in the second receiver 35b. When the second control unit 7b satisfies a predetermined condition that the change in the detected pressure of the high pressure sensor 27b becomes small after the start of the pump down operation, the second control unit 7b closes the outdoor expansion valve 32b, ends the pump down operation, and compresses at a constant speed. Both the machine 12b and the variable speed compressor 11b are stopped. The second control unit 7b continues to drive the second indoor fan 20b even after the pump down operation is terminated.

In step S13, the management device 80 reports to the first control unit 7a of the first air conditioner 1a that a refrigerant leak has occurred in the second air conditioner 1b due to communication via the communication line, and starts backup. Sends a signal to start.

In step S14, the first control unit 7a activates the first air conditioner 1a that has been stopped, and controls the operation of the first air conditioner 1a. Specifically, the first control unit 7a compresses at a variable speed so that the temperature of the refrigerant flowing through the indoor heat exchanger 18a becomes the target evaporation temperature based on the detection temperature of the indoor temperature sensor 14a and a predetermined set temperature. It controls the frequency of the machine 11a and controls the drive or stop of the constant speed compressor 12a. Further, the first control unit 7a controls the valve opening degree of the indoor expansion valve 17a so that the degree of superheat of the refrigerant sucked by the variable speed compressor 11a or the constant speed compressor 12a becomes a predetermined degree of superheat. The first control unit 7a controls the valve opening degree of the outdoor expansion valve 32a so as to be fully opened. The first control unit 7a drives the first outdoor fan 37a and the first indoor fan 20a, and controls each to have a predetermined air volume. As a result, even when the refrigerant leaks from the second air conditioner 1b, the temperature rise of the computer room R1 is suppressed.

The second air conditioner 1b in which the refrigerant leakage has occurred is repaired by a service engineer who has grasped the occurrence of the refrigerant leakage in the second air conditioner 1b in the management device 80 or the like.

(6) Features of the Embodiment In the air conditioning system 100 for the computer room of the present embodiment, the air temperature of the computer room R1 in which a plurality of computers and the like are installed can be kept low by the cooling operation by the second air conditioner 1b. can. Therefore, it is possible to prevent the computer from malfunctioning due to an increase in temperature. Then, even if a refrigerant leaks in the second air conditioner 1b and cooling by the second air conditioner 1b cannot be performed properly, the cooling operation by the first air conditioner 1a for backup is performed. , It is possible to keep the temperature of the computer room R1 low. Therefore, it is possible to more reliably prevent a malfunction of the computer or the like installed in the computer room R1. Here, when the first air conditioner 1a is driven to perform the cooling operation, the first indoor fan 20a of the first air conditioner 1a is driven to generate an air flow in the computer room R1, so that the second air flow is generated. It is possible to prevent the refrigerant leaked from the air conditioner 1b from staying in one place, and to make it difficult to generate a place where the concentration of the leaked refrigerant is high.

Further, even in the second air conditioner 1b in which the refrigerant leaks, the operating state of the second indoor fan 20b of the second air conditioner 1b is maintained by the maximum air volume. As a result, a sufficient air flow can be generated in the computer room R1, so that the refrigerant leaked from the second air conditioner 1b is effectively suppressed from staying in one place, and the concentration of the leaked refrigerant is high. It becomes possible to suppress the occurrence of.

Then, the second air conditioner 1b in which the refrigerant leaks occurs performs a pump-down operation in which the refrigerant filled in the refrigerant circuit 10b is collected by the second receiver 35b of the outdoor unit 3b arranged outdoors. This makes it possible to move the refrigerant to a place other than the computer room R1 and to make the refrigerant leakage point in the refrigerant circuit 10b of the second air conditioner 1b a negative pressure, reducing the amount of refrigerant leakage. It will be possible to make it. Further, by collecting the refrigerant of the second air conditioner 1b in the second liquid receiver 35b, it is possible to promptly perform the subsequent repair work of the second air conditioner 1b.

Here, in the second air conditioner 1b after the pump down operation is completed, the operations of the variable speed compressor 11b and the constant speed compressor 12b are stopped, but the cooling operation by the first air conditioner 1a is continued even after that. Therefore, it is possible to continue to suppress an increase in the temperature of the computer chamber R1.

(7) Other Embodiment (7-1) Other Embodiment A
In the above embodiment, the case where the first air conditioner 1a is a backup air conditioner and the computer room R1 is normally cooled only by the second air conditioner 1b has been described as an example.

On the other hand, for example, the first air conditioner 1a and the second air conditioner 1b may both perform cooling operation during normal operation. In this case, the leaker, which is the air conditioner of the first air conditioner 1a and the second air conditioner 1b where the refrigerant leaks, controls the second air conditioner 1b in the above embodiment, and the refrigerant leaks. The non-leakage machine, which is the air conditioner that does not occur, may control the first air conditioner 1a according to the above embodiment.

(7-2) Other Embodiment B
In the above embodiment, the computer room air conditioning system 100 that notifies the first air conditioner 1a via the management device 80 that the refrigerant leakage has occurred in the second air conditioner 1b has been described as an example.

On the other hand, the second control unit 7b of the second air conditioner 1b informs the first control unit 7a of the first air conditioner 1a that the refrigerant has leaked by itself without going through the management device 80. It may be.

(7-3) Other Embodiment C
In the above embodiment, the case where the refrigerant leakage in the second air conditioner 1b is detected by the second refrigerant leakage sensor 13b has been described as an example.

On the other hand, grasping that a refrigerant leak has occurred is not limited to grasping by the sensor. For example, when the second air conditioner 1b is controlled to perform normal operation and the degree of decrease in the detection pressure of the low pressure sensor 26b or the high pressure sensor 27b satisfies a predetermined condition, the refrigerant leakage has occurred. You may try to figure it out.

(7-4) Other Embodiment D
In the above embodiment, the case where the indoor units 2a and 2b have a structure in which the conditioned air is blown out toward the underfloor has been described as an example.

On the other hand, the direction in which the conditioned air is blown out by the indoor units 2a and 2b is not particularly limited, and for example, a structure may be used in which the air-conditioned air is blown out toward the installation position of the computer arranged in the computer room R1.

(7-5) Other Embodiment E
In the above embodiment, the case where the first refrigerant leakage sensor 13a is arranged in the vicinity of the indoor heat exchanger 18a and the second refrigerant leakage sensor 13b is arranged in the vicinity of the indoor heat exchanger 18b has been described as an example.

On the other hand, the refrigerant leakage sensor included in each indoor unit may be arranged outside the housing 50. Further, one refrigerant leakage sensor common to the indoor unit 2a and the indoor unit 2b may be used.

(Additional note)
Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the embodiments and details are possible without departing from the spirit and scope of the present disclosure described in the claims. ..

1a 1st air conditioner 1b 2nd air conditioner 2a Indoor unit (1st indoor unit)
2b Indoor unit (second indoor unit)
3a Outdoor unit (1st outdoor unit)
3b outdoor unit (second outdoor unit)
10a Refrigerant circuit 10b Refrigerant circuit 11a Variable speed compressor (first compressor)
11b Variable speed compressor (second compressor)
12a Constant speed compressor (first compressor)
12b Constant speed compressor (second compressor)
13a 1st refrigerant leak sensor 13b 2nd refrigerant leak sensor 17a Indoor expansion valve 17b Indoor expansion valve 18a Indoor heat exchanger 18b Indoor heat exchanger 20a 1st indoor fan (1st fan)
20b 2nd indoor fan (2nd fan)
31a Outdoor heat exchanger 31b Outdoor heat exchanger 32a Outdoor expansion valve 32b Outdoor expansion valve 35a 1st liquid receiver 35b 2nd liquid receiver 37a 1st outdoor fan 37b 2nd outdoor fan 100 Computer room air conditioning system R1 computer Room R2 management room

Japanese Unexamined Patent Publication No. 11-063636

Claims (6)

An air conditioning system (100) for a computer room that harmonizes the air in the computer room (R1).
A first air conditioner (1a) having a first outdoor unit (3a) and a first indoor unit (2a),
A second air conditioner (1b) having a second outdoor unit (3b) and a second indoor unit (2b) and having a different refrigerant system from the first air conditioner.
Equipped with
The first air conditioner has a first compressor (11a, 12a) and a first fan (20a) provided in the first indoor unit.
The second air conditioner has a second compressor (11b, 12b).
The first indoor unit and the second indoor unit perform air conditioning for the same computer room (R1), and perform air conditioning.
When the leakage condition relating to the leakage of the refrigerant in the second air conditioner is satisfied, the operation of the second compressor is stopped, and the first compressor and the first fan are in the operating state.
Air conditioning system for computer room. The second air conditioner has a second fan (20b) provided in the second indoor unit.
When the leakage condition is satisfied, the second fan is put into operation.
The air conditioning system for a computer room according to claim 1. When the leakage condition is satisfied, the air volume of the second fan increases.
The air conditioning system for a computer room according to claim 2. The second outdoor unit has a refrigerant receiver (35b).
When the leakage condition is satisfied, the second air conditioner stops the operation of the second compressor after performing an operation of recovering the refrigerant contained in the second air conditioner to the liquid receiver.
The air conditioning system for a computer room according to any one of claims 1 to 3. When the leakage condition is satisfied while the first compressor is stopped, the first compressor starts to be driven.
The air conditioning system for a computer room according to any one of claims 1 to 4. An air conditioning system (100) for a computer room that harmonizes the air in the computer room (R1).
A first air conditioner (1a) having a first outdoor unit (3a) and a first indoor unit (2a),
A second air conditioner (1b) having a second outdoor unit (3b) and a second indoor unit (2b) and having a different refrigerant system from the first air conditioner.
Equipped with
The first air conditioner has a first compressor (11a, 12a) and a first fan (20a) provided in the first indoor unit.
The second air conditioner has a second compressor (11b, 12b) and a second fan (20b) provided in the second indoor unit.
The first indoor unit and the second indoor unit perform air conditioning for the same computer room (R1), and perform air conditioning.
When the first leakage condition relating to the leakage of the refrigerant in the first air conditioner is satisfied, the operation of the first compressor is stopped, the second compressor and the second fan are in the operating state.
When the second leakage condition relating to the leakage of the refrigerant in the second air conditioner is satisfied, the operation of the second compressor is stopped, and the first compressor and the first fan are in the operating state.
Air conditioning system for computer room.

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