KR102507039B1 - Module Type Air-Conditioning System - Google Patents

Abstract

The present invention relates to a modular air conditioning system, and relates to a heat source-side secondary fluid supply pipe through which secondary fluid is supplied, a load-side secondary fluid supply pipe for supplying a load-side secondary fluid to a load module, and a load-side secondary fluid supply pipe from the load module to the load side. A heat source/load linkage unit having a load-side secondary fluid return pipe through which the secondary fluid is returned, a compressor, a condenser, an expansion device, an evaporator, and a refrigerator unit having a refrigerant pipe through which the refrigerant circulates in this order, in series with each other. The forced cooling mode in which the refrigerator unit is operated to perform cooling when the water supply temperature of the secondary fluid at the heat source side is higher than the predetermined mode conversion temperature, and the secondary fluid at the heat source side when the temperature of the secondary fluid supplied at the heat source side is lower than the mode conversion temperature. A plurality of submodules having a mode switching unit that switches to a natural cooling mode in which cooling is performed by fluid, and heat source side secondary fluid supplied from the submodules is drained to the outside or returned to the heat source to drain/return the heat source side secondary fluid It includes a drain/return unit with piping.

Description

Modular air conditioning system {Module Type Air-Conditioning System}

The present invention relates to an air conditioning system, and relates to a modular air conditioning system capable of easily coping with a load by modularizing a refrigerator unit and a mode switching unit that switches an operation mode.

Recently, an air conditioning system capable of providing a plurality of refrigerators and controlling the number of operating refrigerators according to a load has been provided. As a specific example, as shown in FIG. 1 , a plurality of (here two) refrigerators 10a and 10b including a compressor 11, a condenser 12, an expansion device 13 and an evaporator 14 are arranged in parallel. An air conditioning system that is connected and allows the load-side secondary fluid cooled in the evaporator 14 of each of the refrigerators 10a and 10b to flow to each load-side heat exchanger 20.

In addition, the conventional air conditioning system cools air whose temperature has increased in the load generating space 40 by heat exchange with the load-side secondary fluid while passing through the load-side heat exchanger 20 of each of the refrigerators 10a and 10b, and then Cooling is performed on the load generating space 40 by allowing it to flow into the generating space 40 . Meanwhile, in the condenser 12 of each of the refrigerators 10a and 10b, the refrigerant is condensed through heat exchange between the secondary fluid passing through the heat source 30 and the refrigerant.

In a conventional air conditioning system having such a configuration, when a load increases or when a new installation is performed, the refrigerators 10a and 10b and the load-side heat exchanger 20 having the same configuration as the refrigerators 10a and 10b and the load-side heat exchanger 20 are placed in parallel for various loads. There is no choice but to respond by expanding or installing them. In this way, in order to expand or install the refrigerator and the load-side heat exchanger in parallel, it is necessary to secure space on the outdoor and indoor sides. In addition, there is a problem in that overall integrated control due to the expansion or installation of the refrigerator is difficult due to the individual control of the refrigerator.

In addition, recently, an air conditioning system having a plurality of refrigerators is often operated for a long time in order to adjust the temperature of a data center, a clean room, etc., and thus, a demand for energy saving from consumers is increasing.

The present invention is to solve the problems of the conventional air conditioning system, and modularizes a freezer unit and a mode conversion unit for switching operation modes, and serially expands the modularized freezer unit and mode conversion unit through simple manipulation. It is an object of the present invention to provide a modular air conditioning system that can easily respond to loads by enabling installation.

In addition, in the present invention, when the temperature of the supplied secondary fluid on the heat source side is lower than the preset mode conversion temperature, cooling is performed by the secondary fluid on the heat source side without operating the chiller unit, thereby saving energy required for cooling. It is an object of the present invention to provide a modular air conditioning system.

In order to achieve the above object, the modular air conditioning system according to the present invention is a heat source side secondary fluid supply pipe for supplying the heat source side secondary fluid, a load side secondary fluid supply pipe for supplying the load side secondary fluid to the load module, , A heat source/load linkage unit having a load-side secondary fluid return pipe through which the load-side secondary fluid is returned from the load module, a compressor, a condenser, an expansion device, an evaporator, and a refrigerator having a refrigerant pipe through which refrigerant circulates in this order. units and a forced cooling mode in which cooling is performed by operating the chiller unit when the water supply temperature of the secondary fluid at the heat source side is higher than a predetermined mode switching temperature, and the temperature of the secondary fluid supplied at the heat source side is the mode switching mode. A plurality of submodules having a mode switching unit that switches to a natural cooling mode in which cooling is performed by the secondary fluid on the heat source side when the temperature is lower than the secondary fluid on the heat source side, and the secondary fluid on the heat source side supplied from the submodule is drained to the outside or returned to the heat source. It includes a drain/return unit having a secondary fluid drain/return pipe on the heat source side.

The modular air conditioning system of the present invention having such a configuration can easily respond to loads by connecting the mode switching units in series in submodules having a refrigerator unit and a mode switching unit.

In addition, in the modular air conditioning system of the present invention, when the water supply temperature of the supplied secondary fluid on the heat source side is lower than the preset mode conversion temperature, it is switched to the natural cooling mode to cool the space where the load is generated by the secondary fluid on the heat source side. This can save energy needed for cooling.

1 is a diagram schematically illustrating a conventional air conditioning system.
2 is a diagram schematically showing the entire modular air conditioning system according to an embodiment of the present invention.
3 is a diagram specifically showing the configuration of submodules in a modular air conditioning system according to an embodiment of the present invention.
4 is a diagram showing a first operation mode in a modular air conditioning system according to an embodiment of the present invention.
5 is a diagram showing a second operation mode in a modular air conditioning system according to an embodiment of the present invention.
6 is a flowchart illustrating a control method of first and second driving modes according to an embodiment of the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring an accompanying drawing. For convenience of description, the sizes or ratios of the components shown in the drawings are different from those in reality, and the same components are given the same reference numerals and overlapping descriptions will be omitted.

Referring to FIGS. 2 and 3 , in the modular air conditioning system according to the present embodiment, a plurality of (two in the present embodiment) cooling modules 100 (100a, 100b) are connected in parallel. The cooling module (100: 100a, 100b) is connected to the heat source side pipe 120 through which the heat source side secondary fluid (eg, deep sea water, river water, etc.) flows, and the load side secondary fluid (eg, water, etc.) It is connected to the load module 700 by the flowing load-side pipe 720 .

In addition, a circulation pump 130 is provided in the heat source side pipe 120, and the heat source side secondary fluid is supplied to the cooling modules 100: 100a and 100b by operation of the circulation pump 130. In this embodiment, the secondary fluid on the heat source side that has passed through the cooling modules 100: 100a and 100b is configured to be drained, but the secondary fluid on the heat source side may be circulated (returned) through the cooling tower.

The load module 700 exchanges heat between the load-side secondary fluid and air circulating in the load generating space 710 of the building, and a load-side heat exchanger is provided inside. A plurality of load-side heat exchangers provided in the load module 700 may be provided.

The cooling modules 100: 100a and 100b include a heat source/load linkage unit 200 connected to a heat source and a load, a plurality of sub-modules 300 connected in series to each other, and a drainage/return unit connected to the heat source ( 600) is provided.

The heat source/load linkage unit 200 communicates with the heat source side pipe 120 and connects the heat source side secondary fluid supply pipe 210 to which the heat source side secondary fluid is supplied, and the load module 700 through the load side pipe 720. ) and the load-side secondary fluid supply pipe 220 that communicates with the load-side secondary fluid and supplies the load-side secondary fluid to the load module 700, and communicates with the load module 700 through the load-side pipe 720 and passes through the load module 700. A load-side secondary fluid return pipe 230 through which the load-side secondary fluid is returned is provided. A strainer 270 may be attached to the secondary fluid supply pipe 210 on the heat source side to remove impurities and the like from the secondary fluid supplied to the heat source side.

In addition, the heat source/load connection unit 200 is provided with a first closed pipe 240 having one end closed and the other end open. The open other end of the first closed pipe 240 communicates with a second through pipe 520 provided in the sub-module 300 to be described later.

In the load-side secondary fluid supply pipe 220 in the heat source/load linkage unit 200, a circulation pump 250 is provided to circulate the load-side secondary fluid between the cooling modules 100:100a and 100b and the load module 700. is provided. A bypass pipe 260 bypassing the circulation pump 250 is provided in the load-side secondary fluid supply pipe 220, and the bypass pipe 260 opens and closes the flow of the load-side secondary fluid to the bypass pipe 260. A valve 261 (corresponding to the 'fifth on-off valve' in the claims) is provided. For this reason, when the pressure of the load-side secondary fluid circulating between the cooling modules (100:100a, 100b) and the load module 700 is high, the circulation pump 250 is stopped and the on-off valve 261 is opened to bypass the pipe. The secondary fluid on the load side can flow through (260).

Each sub-module 300 includes a refrigerator unit 400 and a mode switching unit 500 that switches the control mode by controlling the flow of the secondary fluid on the heat source side and the secondary fluid on the load side. As the control mode, 'forced cooling mode' in which the chiller unit 400 is operated to perform cooling when the temperature of the heat source side secondary fluid flowing into the cooling module 100 is equal to or higher than a predetermined mode conversion temperature, and the heat source side secondary fluid There is a 'natural cooling mode' in which operation of the chiller unit 400 is stopped when the temperature is lower than the above mode switching temperature and cooling is performed by the secondary fluid on the heat source side. This will be described in more detail while explaining the operation mode of the modular air conditioning system of the present embodiment.

The refrigerator unit 400 includes a compressor 410, a condenser 420, an expansion device 430, and an evaporator 440, and includes a refrigerant pipe 450 through which refrigerant circulates in this order. In the condenser 420 of the refrigerator unit 400, the refrigerant and the secondary fluid on the heat source side exchange heat, and in the evaporator 440, the refrigerant and the secondary fluid on the load side exchange heat. To this end, the refrigerator unit 400 includes a condenser connection pipe 460 through which the secondary fluid on the heat source side passes through the condenser 420 and an evaporator connection pipe 470 through which the secondary fluid on the load side passes through the evaporator 440. to provide

The mode switching unit 500 includes a first through pipe 510, a second through pipe 520, a third through pipe 530, and a fourth through pipe 540 penetrating the mode switching unit 500. . In addition, the plurality of submodules 300 include the first through pipe 510, the second through pipe 520, the third through pipe 530, and the fourth through pipe 540 of each mode switching unit 500, respectively. They are connected in series by connecting them to each other.

In addition, the first through pipe 510 is in communication with the secondary fluid supply pipe 210 on the heat source side of the heat source/load linkage unit 200, and the second through pipe 520 is of the drainage/return unit 600 described later. It communicates with the heat source side secondary fluid drain/return pipe 610, the third through pipe 530 communicates with the load side secondary fluid return pipe 230 of the heat source/load linkage unit 200, and the fourth through pipe 540 communicates with the secondary fluid supply pipe 220 on the load side of the heat source/load linkage unit 200. The meaning of 'communication' described in this specification includes not only direct communication between pipes, but also communication through another pipe, and means that fluid can flow between the communicated pipes.

In addition, the mode switching unit 500 is a first connection pipe that is branched from the first through pipe 510 at point A, passes through the condenser 420 of the refrigerator unit 400, and communicates with the second through pipe 520 at point D. 550, a second connection pipe 560 branched from the first through pipe 510 at point A and communicating with the fourth through pipe 540 at point C, and a third through pipe 530 at point B The third connection pipe 570 that is branched from and communicates with the fourth through pipe 54 at point C through the evaporator 430 of the refrigerator unit 400, and branched from the third through pipe 530 at point B A fourth connection pipe 580 communicating with the second through pipe 520 at point D is provided.

The first connection pipe 550 communicates with the condenser connection pipe 460 provided to pass through the condenser 420 of the refrigerator unit 400 at the middle portion. Therefore, in the refrigerator unit 400, the condenser connection pipe 460 constitutes a part of the first connection pipe 550. The third connection pipe 570 also communicates with the evaporator connection pipe 470 provided to pass through the evaporator 440 of the refrigerator unit 400 at the middle portion. Therefore, in the refrigerator unit 400, the evaporator connection pipe 470 constitutes a part of the third connection pipe 570.

In addition, first to fourth opening/closing valves 551 , 561 , 571 , and 581 opening and closing the respective connecting pipes are provided in the first to fourth connection pipes 550 , 560 , 570 , and 580 . When the first on-off valve 551 and the third on-off valve 571 are opened and the second on-off valve 561 and the fourth on-off valve 581 are closed, the secondary fluid on the heat source side enters the first through pipe ( 510) and then flows into the condenser 420 of the refrigerator unit 400 through the first connection pipe 550 (including the condenser connection pipe 460) at point A, and then After passing through the condenser 420, it flows to the second through pipe 520 at point D and exits the mode conversion unit 500. The secondary fluid on the heat source side flowing through the second through pipe 520 and exiting the mode switching unit 500 passes through the mode switching unit 500 of the neighboring sub module 300 to drain/return unit 600 to be described later. drained through or returned to the heat source. In addition, the load-side secondary fluid flows into the mode switching unit 500 through the third through pipe 530 and then passes through the third connection pipe 570 (including the evaporator connection pipe 470) at point B to the chiller unit. It flows into the evaporator 440 of 400, passes through the evaporator 440, and flows through the fourth through pipe 540 at point C, exits the mode conversion unit 500, and is supplied to the load module 700 (FIG. 4). reference).

Conversely, when the first on-off valve 551 and the third on-off valve 571 are closed and the second on-off valve 561 and the fourth on-off valve 581 are opened, the secondary fluid on the heat source side switches modes. After being introduced into the unit 500, it flows through the second connection pipe 560 at point A, exits the mode conversion unit 500 through the fourth through-pipe 540 at point C, and is supplied to the load module 700, After passing through the load module 700, the secondary fluid on the heat source side flows into the mode conversion unit 500 through the third through pipe 530, flows to the fourth connection pipe 580 at point B, and flows through the second through pipe at point D. It flows through the pipe 520 and exits the mode switching unit 500. The secondary fluid on the heat source side flowing through the second through pipe 520 and exiting the mode switching unit 500 passes through the mode switching unit 500 of the neighboring sub module 300 to drain/return unit 600 to be described later. It is drained through or returned to the heat source (see FIG. 5). Regarding this, it will be described in more detail below while explaining the driving mode control method of the present embodiment.

The drainage/return unit 600 drains the heat source-side secondary fluid to the outside or returns it to the heat source, and one end is connected to the second through-pipe 520 of the mode switching unit 500 in the neighboring sub-module 300. It is provided with a secondary fluid drain/return pipe 610 on the heat source side, the other end of which is in communication with the heat source pipe 120. In addition, the drainage/return unit 600 has one end closed and the other end connected to the first through pipe 510, the third through pipe 530, and the fourth through pipe of the mode switching unit 500 in the neighboring sub module 300. A second closed pipe 620, a third closed pipe 630 and a fourth closed pipe 640 connected to each of the pipes 540 are provided.

In the modular air conditioning system of the present embodiment having such a configuration, each of the first to fourth through-pipes 510, 520, 530, and 540 provided to pass through the mode conversion unit 500 of one sub-module 300 A plurality of submodules 300 can be connected in series by connecting the first through fourth through pipes 510, 520, 530, and 540 of neighboring submodules 300 to each other. Therefore, the submodule 300 can be increased or decreased by a simple manipulation.

In addition, in the modular air conditioning system of the present embodiment, each of the first to fourth through-pipes 510, 520, 530, and 540 provided to pass through the mode switching unit 500 of the sub-module 300 is linked to a heat source/load. The submodule is connected to the heat source side secondary fluid supply pipe 210, the first closed pipe 240, the load side secondary fluid supply pipe 220, and the load side secondary fluid return pipe 230 of the unit 200. The first through fourth through-pipes 510, 520, 530, and 540 can be connected to the heat source/load linkage unit 200 and are provided to pass through the mode conversion unit 500 of the sub module 300. By connecting each of them to the second closed pipe 620, drain / return pipe 610, third closed pipe 630, and fourth closed pipe 640 of the drain / return unit 600, the submodule ( 300) and the drainage/return unit 600 may be connected. Accordingly, in the modular air conditioning system of the present embodiment, the plurality of submodules 300, the heat source/load linkage unit 200, and the water drainage/return unit 600 can be easily connected by a simple operation.

In addition, in the modular air conditioning system of the present embodiment, the condenser connecting pipe 460 and the evaporator connecting pipe 470 of the refrigerator unit 400 in the sub module 300 are first connected to the mode switching unit 500. By connecting the pipe 550 and the third connection pipe 570, the refrigerator unit 400 and the mode switching unit 500 can be connected. Accordingly, the connection between the refrigerator unit 400 and the mode switching unit 500 can be easily performed by a simple operation.

As such, the modular air conditioning system of the present embodiment is connected between the submodules 300, between the submodules 300 and the heat source/load linkage unit 200, and between the submodules 300 and the drainage/return unit 600. ), it is possible to easily cope with the load because the connection between them can be performed by a simple operation.

A method for controlling the operation mode of the modular air conditioning system according to the present embodiment will be described in detail with reference to FIGS. 4 to 6 . The operation modes of the modular air conditioning system of the present embodiment include a first operation mode in which cooling is performed by operating the chiller unit 400 for the plurality of submodules 300 and controlling them in a 'forced cooling mode'; Regarding (300), there is a second operation mode in which the refrigerator unit 400 is not operated and controlled in a 'natural cooling mode' to perform cooling by the secondary fluid on the heat source side. For reference, in relation to the flows of the secondary fluid on the heat source side and the secondary fluid on the load side shown in FIGS. 4 and 5 for convenience of explanation, the solid line indicates the flow of the secondary fluid involved in cooling in one submodule 300. It was to be shown, and the soft solid line was to indicate the flow of the secondary fluid flowing from one sub-module 300 to the other sub-module 300.

First, as shown in FIG. 6, the water supply temperature of the secondary fluid on the heat source side flowing into the heat source/load linkage unit 200 and the preset mode conversion temperature are compared (S100), and the supply of the secondary fluid on the heat source side is compared. When the temperature is equal to or higher than the mode switching temperature (YES in S100), the first operation mode in which cooling is performed by controlling the plurality of submodules 300 in the 'forced cooling mode' is performed, and the water supply temperature of the secondary fluid on the heat source side is When it is lower than the mode switching temperature (NO in S100), the second operation mode in which cooling is performed by controlling the plurality of submodules 300 in the 'natural cooling mode' is performed.

Here, the mode conversion temperature is a temperature at which cooling is possible by the secondary fluid on the heat source side, which is lower than the preset temperature of the load generating space 710 and is sufficiently low to lower the load generating space 710 to the set temperature. it is desirable

In the first operation mode, as shown in FIG. 4 , the compressor 410 of the refrigerator unit 400 in each of the plurality of submodules 300 is operated (the refrigerator unit is operated), and the mode switching unit 500 operates The first open/close valve 551 and the third open/close valve 571 are opened, and the second open/close valve 561 and the fourth open/close valve 581 are closed (S110). In this case, the heat source side secondary fluid supplied through the heat source side secondary fluid water supply pipe 210 of the heat source/load connection unit 200 flows into the mode switching unit 500 through the first through pipe 510, and then At point A, it flows into the condenser 420 of the refrigerator unit 400 through the first connection pipe 550 (including the condenser connection pipe 460). After condensing the refrigerant flowing through the refrigerant pipe 460 in the condenser 420, the secondary fluid on the heat source side exits the mode conversion unit 500 through the second through pipe 520 at point D, and then passes through another neighboring sub-fluid. It flows through the second through pipe 520 of the module 300 and is drained to the outside or returned to the heat source side through the drain/return pipe 610 of the drain/return unit 600.

On the other hand, the heat source-side secondary fluid flowing through the first through pipe 510 instead of flowing to the first connection pipe 550 at point A flows into the first through pipe 510 of the other neighboring submodule 300, and , flows to the first connection pipe 550, the condenser 420, and the second through pipe 520 in the other submodule 300 in the same manner as described above.

In addition, the load-side secondary fluid introduced through the load-side secondary fluid return pipe 230 of the heat source/load linkage unit 200 via the load module 700 passes through the third through-pipe 530 to the mode switching unit 500 ) and then flows to the evaporator 440 of the refrigerator unit 400 through the third connection pipe 570 (including the evaporator connection pipe 470) at point B. Thereafter, the load-side secondary fluid is cooled through heat exchange with the refrigerant in the evaporator 440, flows to the fourth through pipe 540 at point C, exits the mode conversion unit 500, and enters the heat source/load linkage unit 200 is supplied to the load module 700 through the load-side secondary fluid supply pipe 220.

The low-temperature load-side secondary fluid supplied to the load module 700 performs heat exchange in the load module 700 to cool the air (also referred to as 'ventilation') coming out of the load generating space 710, and then the heat source/load linkage unit ( 200) is introduced into the mode switching unit 500 through the load-side secondary fluid return pipe 230. The air cooled in the load module 700 reenters the load generating space 710 of the building and cools the load generating space 710 (see FIG. 2 ).

Then, the ventilation temperature, which is the temperature of the air passing through the load generating space 710, and the preset set temperature are compared (S120), and if the ventilation temperature is greater than the set temperature (YES in S120), the difference between the ventilation temperature and the set temperature The number of operated submodules 300 is adjusted corresponding to (S130). At this time, the flow rate of the circulation pump 250 is proportionally controlled corresponding to the number of sub-modules 300 operated (S140). As the difference between the ventilation temperature and the set temperature decreases due to the operation of the refrigerator unit 400 of the sub module 300, the number of refrigerator units 400 operated correspondingly decreases and the amount of operation of the circulation pump 250 decreases. is to reduce Energy can be saved by driving in this way. At this time, the first to fourth open/close valves 551, 561, 571, and 581 are all closed for the sub-module 300 that is not operated.

Afterwards, the water supply temperature of the secondary fluid on the heat source side flowing into the heat source/load linkage unit 200 is compared with the preset mode conversion temperature (S150), and when the water supply temperature of the secondary fluid on the heat source side is higher than the mode conversion temperature, Repeat the steps of S120, S130 and S140. In addition, when the ventilation temperature is lower than the set temperature in S120 (NO in S120), the operation of the compressor 410 of the refrigerator unit 400 in the sub module 300 is stopped (the refrigerator unit is stopped) (S300).

Next, in the second operation mode, cooling is performed in the 'natural cooling mode' by the secondary fluid on the heat source side having a low temperature lower than the mode switching temperature. Specifically, as shown in FIGS. 5 and 6 , in the second operation mode, the operation of the compressor 410 of the refrigerator unit 400 in each sub-module 300 is stopped (the refrigerator unit is stopped), and the first The opening/closing valve 551 and the third opening/closing valve 571 are closed, and the second opening/closing valve 561 and the fourth opening/closing valve 581 are opened (S210). In this case, the heat source side secondary fluid supplied through the heat source side secondary fluid water supply pipe 210 of the heat source/load connection unit 200 flows into the mode switching unit 500 through the first through pipe 510, and then It flows through the second connection pipe 560 at point A and exits the mode conversion unit 500 through the fourth through pipe 540 at point C to supply the secondary fluid to the load side of the heat source/load linkage unit 200 (220). ) is supplied to the load module 700. The low-temperature heat source-side secondary fluid exchanges heat with air (ventilation) in the load module 700 to cool the air (ventilation), and then the load-side secondary fluid return pipe 230 and the heat source/load linkage unit 200 3 flows into the mode conversion unit 500 through the through pipe 530. Thereafter, it flows from point B of the third through pipe 530 to the fourth connection pipe 580 and exits the mode switching unit 500 through the second through pipe 520 at point D to pass through another neighboring submodule 300. After flowing through the second through pipe 520 of ), it is finally drained to the outside or returned to the heat source side through the drain/return pipe 610 of the drain/return unit 600.

On the other hand, the heat source-side secondary fluid flowing through the first through pipe 510 instead of flowing to the first connection pipe 550 at point A flows into the first through pipe 510 of the other neighboring submodule 300, and As described above, the load side of the heat source/load linkage unit 200 exits the mode switching unit 500 through the second connection pipe 560 and the fourth through pipe 540 in the other submodule 300. The secondary fluid is supplied to the load module 700 through the water supply pipe 220. After passing through the load module 700 and flowing into the mode switching unit 500 through the load-side secondary fluid return pipe 230 and the third through pipe 530 of the heat source/load linkage unit 200, the third through pipe It flows to the fourth connection pipe 580 at point B of 530 and exits the mode switching unit 500 through the second through pipe 520 at point D.

Thereafter, the ventilation temperature, which is the temperature of the air passing through the load generating space 710 of the building, and the preset set temperature are compared (S220), and when the ventilation temperature is higher than the set temperature, the heat source corresponds to the difference between the ventilation temperature and the set temperature. The number of submodules 300 through which the side secondary fluid flows and the circulating flow rate in the operated circulation pump 250 are proportionally controlled (S230). This is to reduce the amount of operation of the circulation pump 250 operated in response to the decrease in the difference between the ventilation temperature and the set temperature due to heat exchange with the low-temperature secondary fluid on the heat source side. Energy can be saved by driving in this way. At this time, the first to fourth on-off valves 551, 561, 571, and 581 are all closed for the sub-module 300 in which the secondary fluid on the heat source side is not circulated.

After S230, the water supply temperature of the secondary fluid on the heat source side flowing into the heat source/load linkage unit 200 is compared with the preset mode conversion temperature (S240), and the water supply temperature of the secondary fluid on the heat source side is lower than the mode conversion temperature. In the case (YES in S240), the procedures of S220 and S230 are repeated.

As described above, in the modular air conditioning system of the present embodiment, when the temperature of the supplied secondary fluid on the heat source side is equal to or higher than the preset mode switching temperature, the refrigerator unit is operated to perform cooling in the 'forced cooling mode'. It can be operated in the first operation mode, and energy required for cooling can be saved by proportionally controlling the number of refrigerator units and the operation amount of the circulation pump in response to the difference between the ventilation temperature and the set temperature.

Further, in the modular air conditioning system of the present embodiment, when the temperature of the supplied secondary fluid on the heat source side is lower than the preset mode switching temperature, the secondary fluid on the heat source side performs cooling in a 'natural cooling mode'. It can be operated in two operation modes, saving energy required for cooling. Even in the case of the second operation mode, energy required for cooling can be saved by proportionally controlling the operating amount of the circulation pump in response to the difference between the ventilation temperature and the set temperature.

The embodiments of the present invention described above are only examples embodying the technical idea of the present invention, and the present invention is not limited to the embodiments described above and may be variously changed within the scope of the technical idea described in the claims.

100, 100a, 100b: cooling module 110: cooling tower
120: heat source side piping 130: circulation pump
200: heat source/load linkage unit 210: secondary fluid supply pipe on the heat source side
220: load-side secondary fluid supply pipe 230: load-side secondary fluid return pipe
240: first closed pipe 250: circulation pump
300: sub module 400: freezer unit
460: condenser connection pipe 470: evaporator connection pipe
500: mode conversion unit 510: first through pipe
520: second through pipe 530: third through pipe
540: 4th through pipe 550: 1st connecting pipe
560: second connection pipe 570: third connection pipe
580: 4th connection pipe 600: drainage/return unit
610: drain / return pipe 620: second closed pipe
630: third closed pipe 640: fourth closed pipe
700: load module 710: load generating space
720: load side piping

Claims (7)

A heat source side secondary fluid supply pipe through which heat source side secondary fluid is supplied, a load side secondary fluid supply pipe through which load side secondary fluid is supplied to the load module, and a load side secondary fluid through which the load side secondary fluid is returned from the load module. A heat source/load linkage unit having a water return pipe;
A compressor, a condenser, an expansion device, an evaporator, and a refrigerant unit including refrigerant pipes through which refrigerant circulates in this order, and connected in series to each other, when the supply temperature of the secondary fluid at the heat source side is equal to or higher than a predetermined mode conversion temperature. A plurality of subs having a mode switching unit that switches to a forced cooling mode in which cooling is performed by activating and a natural cooling mode in which cooling is performed by the heat source side secondary fluid when the water supply temperature of the secondary fluid on the heat source side is lower than the mode switching temperature. module,
A drain / return unit having a heat source side secondary fluid drain / return pipe for draining the heat source side secondary fluid supplied from the submodule to the outside or returning it to the heat source,
The mode switching unit,
A first through pipe, a second through pipe, a third through pipe, and a fourth through pipe passing through the mode switching unit are provided, and the first through pipe supplies the secondary fluid to the heat source side of the heat source/load linkage unit. The second through pipe communicates with the heat source side secondary fluid drain/return pipe of the drain/return unit, and the third through pipe supplies the load side secondary fluid of the heat source/load connection unit. In communication with the pipe, the fourth through pipe communicates with the load-side secondary fluid return pipe of the heat source / load linkage unit,
A first connection pipe branching from the first through pipe and communicating with the second through pipe via the condenser of the refrigerator unit, and a second connection pipe branching from the first through pipe and communicating with the fourth through pipe. and a third connection pipe branching off from the third through pipe and communicating with the fourth through pipe through the evaporator of the refrigerator unit, and a fourth connecting pipe branching off from the third through pipe and communicating with the second through pipe. Modular air conditioning system characterized in that it has a connection pipe. The method of claim 1,
Each of the plurality of submodules,
A first opening/closing valve opening and closing the first connection pipe, a second opening/closing valve opening and closing the second connection pipe, a third opening/closing valve opening and closing the third connection pipe, and opening and closing the fourth connection pipe A fourth on-off valve is provided,
In the case of the forced cooling mode, the first on-off valve and the third on-off valve are opened, and the second on-off valve and the fourth on-off valve are closed;
In the case of the natural cooling mode, the first on-off valve and the third on-off valve are closed, and the second on-off valve and the fourth on-off valve are opened. The method of claim 1,
In the plurality of submodules, each of the first to fourth through pipes of one submodule is detachably connected to each of the first to fourth through pipes of other adjacent submodules. Characterized by modular air conditioning systems. The method of claim 1,
When the temperature of the secondary fluid supplied from the heat source is equal to or higher than the load's predetermined mode conversion temperature, the chiller unit of the submodule responds to the difference between the ventilation temperature of the air coming out of the load generating space and a predetermined set temperature. Modular air conditioning system, characterized in that proportionally controlling the number of operating and the flow rate of the circulation pump for circulating the secondary fluid on the load side to the load module. The method of claim 1,
When the temperature of the secondary fluid on the heat source side supplied from the heat source is lower than the mode switching temperature, the secondary fluid on the heat source side is supplied to the load module in response to the difference between the ventilation temperature of the air coming out of the load generating space and a predetermined set temperature. A modular air conditioning system characterized by proportionally controlling the flow rate of a circulation pump that circulates to. According to claim 4 or claim 5,
The circulation pump is provided in the load-side secondary fluid supply pipe of the heat source/load linkage unit,
A bypass pipe bypassing the circulation pump is further provided in the load-side secondary fluid supply pipe,
Modular air conditioning system, characterized in that the bypass pipe is provided with a fifth on-off valve for opening and closing the bypass pipe. delete

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