Chiller system
The chiller system addresses performance degradation by using strainers and connecting pipes to filter foreign substances, ensuring continuous cooling and preventing heat exchanger damage through alternating operation modes.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LG ELECTRONICS INC
- Filing Date
- 2026-01-09
- Publication Date
- 2026-07-23
AI Technical Summary
Chillers face performance degradation due to foreign substances in the water used for heat exchange, which can impair heat exchangers and other components, and existing systems lack effective methods to remove impurities from circulating water.
A chiller system with multiple chillers connected by a connecting pipe and strainers to filter out foreign substances, allowing for alternating operation modes to clean strainers while maintaining cooling functionality.
The system effectively maintains chiller performance by removing impurities, ensuring continuous operation and preventing heat exchanger damage by periodically cleaning strainers without disrupting the cooling process.
Smart Images
Figure KR2026000546_23072026_PF_FP_ABST
Abstract
Description
chiller system
[0001] The present disclosure relates to a chiller system, and more specifically, to a chiller system including a strainer.
[0002] A chiller is a device that uses cooling water to cool air or equipment in buildings, factories, data centers, etc., and can be used primarily when large-scale cooling is required.
[0003] Chillers can cool water or air to cool building air conditioning systems or manufacturing equipment, or to maintain a constant temperature. Additionally, they can reduce power consumption by efficiently managing cooling in large-scale facilities.
[0004] There are various types of chillers, such as absorption chillers, air-cooled chillers, and water-cooled chillers. Additionally, chillers can have a structure that controls the water temperature by using a compressor to compress and evaporate a refrigerant.
[0005] Korean registered patent KR 10-2536079 discloses a chiller that controls the temperature of supplied water using a refrigerant.
[0006] During the process of recovering water and supplying heat-exchanged water, the chiller may contain foreign substances in the water. Foreign substances in the water entering the heat exchanger can impair the performance of the heat exchanger or other components.
[0007] The present disclosure aims to solve the aforementioned problems and other problems.
[0008] Another objective is to provide a chiller system capable of removing impurities from the water recovered and supplied to the chiller.
[0009] Another objective is to provide a chiller system in which, in a chiller system connected by multiple chillers, foreign substances are removed from some of the chillers, and heat-exchanged water is supplied using the water from the remaining chillers.
[0010] To achieve the above objective, a chiller system according to an embodiment of the present disclosure comprises: a main supply pipe for supplying heat-exchanged water to a heat demand source; a main return pipe for recovering water from the heat demand source; a first chiller comprising a first main body that heats or cools water by heat exchange with a refrigerant, a first return pipe connecting the first main body and the main return pipe, and a first supply pipe connecting the first main body and the main supply pipe; a second chiller comprising a second main body that heats or cools water by heat exchange with a refrigerant, a second return pipe connecting the second main body and the main return pipe, and a second supply pipe connecting the second main body and the main supply pipe; a connecting pipe connecting the first return pipe and the second return pipe; and a connecting pipe valve for opening and closing the connecting pipe. When the first return pipe is closed or the second return pipe is closed, the connecting pipe valve opens the connecting pipe.
[0011] A first valve is disposed in the first recovery pipe to control the flow of water flowing into the first main body, and a second valve is disposed in the second recovery pipe to control the flow of water flowing into the second main body. When the first valve closes the first recovery pipe or the second valve closes the second recovery pipe, the connecting pipe valve opens the connecting pipe.
[0012] The chiller system includes a first strainer for removing foreign substances from water flowing through the first return pipe and a second strainer for removing foreign substances from water flowing through the second return pipe. When removing foreign substances accumulated in the first strainer or the second strainer, the first valve closes the first return pipe or the second valve closes the second return pipe.
[0013] The chiller system includes a first drain pipe connected to the first recovery pipe and a second drain pipe connected to the second recovery pipe. The first strainer is disposed in the first recovery pipe between the first drain pipe and the connecting pipe, and the second strainer is disposed in the second recovery pipe between the second drain pipe and the connecting pipe.
[0014] The first drain pipe is connected to the first recovery pipe between the first valve and the first strainer, and the second drain pipe is connected to the first recovery pipe between the second valve and the second strainer.
[0015] The chiller system includes a first drain valve that opens and closes the first drain pipe and a second drain valve that opens and closes the second drain pipe. When the first valve closes the first return pipe or the second valve closes the second return pipe, the first drain valve or the second drain valve disposed in the closed return pipe opens the first drain pipe or the second drain pipe.
[0016] The chiller system operates in a first mode that supplies water, which has been heat-exchanged between the first chiller and the second chiller, to the main supply pipe. In the first mode, the connecting pipe valve closes the connecting pipe, and the first valve and the second valve open the first return pipe and the second return pipe.
[0017] The chiller system operates in a second mode to remove foreign matter accumulated in the first strainer or the second strainer. In the second mode, the connecting pipe valve opens the connecting pipe, and the first valve or the second valve closes the first recovery pipe or the second recovery pipe.
[0018] It includes a first drain pipe connected to the first recovery pipe, a second drain pipe connected to the second recovery pipe, a first drain valve for opening and closing the first drain pipe, and a second drain valve for opening and closing the second drain pipe. In the second mode, the first drain valve or the second drain valve opens the first drain pipe or the second drain pipe.
[0019] Specific details of other embodiments are included in the detailed description and drawings.
[0020] According to the chiller system of the present disclosure, one or more of the following effects are provided.
[0021] First, it has the advantage of maintaining the chiller's performance by removing impurities from the water flowing through the chiller.
[0022] Second, through a structure that connects multiple chillers, there is also the advantage of being able to remove foreign substances during the process of heat-exchanged water flowing through the main supply pipe.
[0023] The effects of the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.
[0024] FIG. 1 is a configuration diagram of a chiller system according to one embodiment of the present disclosure.
[0025] Figure 2 is a diagram for explaining the flow of water in the first mode based on the diagram of Figure 1.
[0026] Figure 3 is a diagram illustrating the flow of water in the second mode based on the diagram of Figure 1.
[0027] FIG. 4 is a diagram showing the configuration of a chiller according to one embodiment of the present disclosure.
[0028] FIG. 5 is a flowchart of a control method for a chiller system according to one embodiment of the present disclosure.
[0029] FIG. 6 is a flowchart of the step of specifying a strainer of a chiller system according to one embodiment of the present disclosure.
[0030] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments below but may be implemented in various different forms. The embodiments provided are merely to make the present disclosure complete and to fully inform those skilled in the art of the scope of the disclosure. The present disclosure is defined only by the scope of the claims. Throughout the specification, like reference numerals refer to like components.
[0031] Hereinafter, the present disclosure will be described with reference to the drawings for explaining a chiller system according to embodiments of the present disclosure.
[0032] Referring to Fig. 1, a chiller system will be described.
[0033] The chiller system includes a plurality of chillers (10, 20, 30). The chiller system (1) includes a first chiller (10), a second chiller (20) spaced apart from the first chiller (10), and a third chiller (30) spaced apart from the second chiller (20).
[0034] The chiller system (1) includes a main supply pipe (42) through which heat-exchanged water supplied from a plurality of chillers (10, 20, 30) flows. The chiller system (1) includes a main return pipe (40) through which water recovered to a plurality of chillers (10, 20, 30) flows.
[0035] Heat-exchanged water is supplied to a heat demand location through the main supply pipe (42). Water from the heat demand location is recovered to multiple chillers (10, 20, 30) through the main recovery pipe (40).
[0036] The first chiller (10) includes a first main body (11) that heats or cools water through heat exchange with a refrigerant.
[0037] The first chiller (10) includes a first supply pipe (12) connecting the main supply pipe (42) and the first main body (11), and a first recovery pipe (13) connecting the main recovery pipe (40) and the first main body (11).
[0038] The first chiller (10) includes a first strainer (15) that is placed in the first recovery pipe (13) and filters out foreign substances in the water flowing into the first main body (11).
[0039] The first chiller (10) includes a first valve (14) that opens and closes the first recovery pipe (13).
[0040] The first chiller (10) includes a first drain pipe (16) connected to a first recovery pipe (13). The first chiller (10) includes a first drain valve (17) that opens and closes the first drain pipe (16).
[0041] The first drain pipe (16) is connected to the first recovery pipe (13) between the first valve (14) and the first strainer (15).
[0042] The second chiller (20) includes a second body (21) that heats or cools water through heat exchange with a refrigerant.
[0043] The second chiller (20) includes a second supply pipe (22) connecting the main supply pipe (42) and the second main body (21), and a second recovery pipe (23) connecting the main recovery pipe (40) and the second main body (21).
[0044] The second chiller (20) includes a second strainer (25) that is positioned in the second recovery pipe (23) and filters out foreign substances in the water flowing into the second main body (21).
[0045] The second chiller (20) includes a second valve (24) that opens and closes the second recovery pipe (23).
[0046] The second chiller (20) includes a second drain pipe (26) connected to the second recovery pipe (23). The second chiller (20) includes a second drain valve (27) that opens and closes the second drain pipe (26).
[0047] The second drain pipe (26) is connected to the second recovery pipe (23) between the second valve (24) and the second strainer (25).
[0048] The third chiller (30) includes a third body (31) that heats or cools water through heat exchange with a refrigerant.
[0049] The third chiller (30) includes a third supply pipe (32) connecting the main supply pipe (42) and the third main body (31), and a third recovery pipe (33) connecting the main recovery pipe (40) and the third main body (31).
[0050] The third chiller (30) includes a third strainer (35) that is placed in the third recovery pipe (33) and filters out foreign substances in the water flowing into the third main body (31).
[0051] The third chiller (30) includes a third valve (34) that opens and closes the third recovery pipe (33).
[0052] The third chiller (30) includes a third drain pipe (36) connected to the third recovery pipe (33). The third chiller (30) includes a third drain valve (37) that opens and closes the third drain pipe (36).
[0053] The third drain pipe (36) is connected to the third recovery pipe (33) between the third valve (34) and the third strainer (35).
[0054] The chiller system (1) includes a connecting pipe (50) that connects the first recovery pipe (13), the second recovery pipe (23), and the third recovery pipe (33) to each other.
[0055] The connecting pipe (50) is connected to each of the multiple recovery pipes (13, 23, 33) between the strainer and the chiller. That is, the connecting pipe (50) is connected to the first recovery pipe between the first strainer (15) and the first chiller (10). In addition, the connecting pipe (50) is connected to the first recovery pipe between the second strainer (25) and the second chiller (20). In addition, the connecting pipe (50) is connected to the first recovery pipe between the third strainer (35) and the third chiller (30).
[0056] The chiller system (1) includes a first connecting pipe valve (52) that opens and closes a connecting pipe (50) between a first recovery pipe (13) and a second recovery pipe (23), and a second connecting pipe valve (54) that opens and closes a connecting pipe (50) between a second recovery pipe (23) and a third recovery pipe (33).
[0057] Referring to Fig. 2, the flow of water in the first mode is described.
[0058] In the first operating mode (M1), a plurality of chillers (10, 20, 30) heat exchange water flowing into their respective recovery pipes and flow water into their respective supply pipes.
[0059] The first operating mode (M1) may be a mode in which each chiller (10, 20, 30) receives water from a recovery pipe and sends heat-exchanged water to a supply pipe.
[0060] In the first operating mode (M1), the first connecting pipe valve (52) and the second connecting pipe valve (54) each close the connecting pipe (50). Therefore, water does not flow through the connecting pipe (50).
[0061] In the first operating mode (M1), the first drain valve (17) closes the first drain pipe (16). In the first operating mode (M1), the second drain valve (27) closes the second drain pipe (26). In the first operating mode (M1), the third drain valve (37) closes the third drain pipe (36).
[0062] Water flowing through the first recovery pipe (13) is heat-exchanged in the first chiller (10) and flows into the first supply pipe (12). Therefore, foreign substances in the water flowing through the first recovery pipe (13) can accumulate in the first strainer (15).
[0063] The water flowing through the second recovery pipe (23) is heat-exchanged in the second chiller (20) and flows into the second supply pipe (22). Foreign substances in the water flowing through the second recovery pipe (23) can accumulate in the second strainer (25).
[0064] The water flowing through the third recovery pipe (33) is heat-exchanged in the third chiller (30) and flows into the third supply pipe (32). Foreign substances in the water flowing through the third recovery pipe (33) can accumulate in the third strainer (35).
[0065] Referring to Fig. 3, the flow of water in the second mode is described.
[0066] The second mode is a mode for cleaning the strainer. In the second mode, at least one strainer among the plurality of strainers can be cleaned.
[0067] In FIG. 3, a mode for cleaning the second strainer (25) among a plurality of strainers is described as an example.
[0068] In the second mode for cleaning the second strainer (25), the second valve (24) closes the second recovery pipe (23). In the second mode for cleaning the second strainer (25), the first valve (14) and the third valve (34), excluding the second valve (24), open the first recovery pipe (13) and the third recovery pipe (33), respectively.
[0069] In the second mode for cleaning the second strainer (25), the second drain valve (27) opens the second drain pipe (26). In the second mode for cleaning the second strainer (25), the first drain valve (17) and the third drain valve (37), excluding the second drain valve (27), close the first drain pipe (16) and the third drain pipe (36), respectively.
[0070] In the second operating mode (M2), the first connecting pipe valve (52) and the second connecting pipe valve (54) each open the connecting pipe (50). Thus, water flows through the connecting pipe (50). The water flowing through the connecting pipe (50) can flow into the second recovery pipe (23).
[0071] The water flowing through the first recovery pipe (13) is heat-exchanged in the first chiller (10) and flows into the first supply pipe (12). However, a portion of the water flowing through the first recovery pipe (13) flows into the second recovery pipe (23) through the connecting pipe (50).
[0072] The water flowing through the third recovery pipe (33) is heat-exchanged in the third chiller (30) and flows into the third supply pipe (32). However, a portion of the water flowing through the third recovery pipe (33) flows into the second recovery pipe (23) through the connecting pipe (50).
[0073] The flow of water flowing into the second chiller (20) through the second recovery pipe (23) is restricted by the second valve (24). However, water introduced through the connecting pipe (50) may flow back through the second recovery pipe (23). Water introduced into the second recovery pipe (23) through the connecting pipe (50) flows through the second strainer (25) to the second drain pipe (26). Therefore, foreign matter accumulated in the second strainer (25) can be discharged through the second drain pipe (26).
[0074] With reference to FIG. 4, the configuration of the chiller of the present invention will be explained.
[0075] Referring to FIG. 4, the configuration placed inside the chiller is described. The chiller described in FIG. 4 can be applied in the same way to the first chiller (10), the second chiller (20), and the third chiller (30), respectively.
[0076] The chiller includes a first compressor (102) that compresses a first refrigerant. The chiller includes a first heat exchanger (104) that exchanges heat between the first refrigerant discharged from the first compressor (102) and air.
[0077] The chiller includes a second compressor (202) that compresses a second refrigerant. The chiller includes a second heat exchanger (204) that exchanges heat between the second refrigerant discharged from the second compressor (202) and air.
[0078] The chiller includes a fan (300) that forms an airflow to a first heat exchanger (104) and a second heat exchanger (204). The chiller can form an airflow to each of the first heat exchanger (104) and the second heat exchanger (204) using a single fan (300).
[0079] The first refrigerant and the second refrigerant may be of the same type or different types. However, the first refrigerant and the second refrigerant flow so as not to mix with each other. The first refrigerant is circulated by the first compressor (102), and the second refrigerant is circulated by the second compressor (202).
[0080] The chiller includes a third heat exchanger (302) that exchanges heat with water and a first or second refrigerant. The third heat exchanger (302) may operate complementarily with the first heat exchanger (104) or the second heat exchanger (204). Here, complementary operation may mean opposite to use as a condenser or as an evaporator.
[0081] For example, when the third heat exchanger (302) is used as a condenser, the first heat exchanger (104) or the second heat exchanger (204) can be used as an evaporator. Also, when the third heat exchanger (302) is used as an evaporator, the first heat exchanger (104) or the second heat exchanger (204) can be used as a condenser.
[0082] The third heat exchanger (302) can supply water that has been heat-exchanged with the first refrigerant and the second refrigerant to a water supply pipe (not shown). The third heat exchanger (302) may be a plate heat exchanger that heat-exchanges water and refrigerant.
[0083] A third heat exchanger (302) is connected to a return pipe (304) through which water flows into the third heat exchanger (302) and a supply pipe (306) through which water that has been heat-exchanged in the third heat exchanger (302) flows.
[0084] The chiller includes a first switching valve (106) that selectively sends a first refrigerant discharged from a first compressor (102) to a first heat exchanger (104) or a third heat exchanger (302).
[0085] The first switching valve (106) can send the first refrigerant discharged from the first compressor (102) to the first heat exchanger (104) and send the first refrigerant flowing from the third heat exchanger (302) to the first compressor (102). Additionally, the first switching valve (106) can send the first refrigerant discharged from the first compressor (102) to the third heat exchanger (302) and send the first refrigerant flowing from the first heat exchanger (104) to the first compressor (102).
[0086] The chiller includes a second switching valve (206) that selectively sends the second refrigerant discharged from the second compressor (202) to the second heat exchanger (204) or the third heat exchanger (302).
[0087] The second switching valve (206) can send the second refrigerant discharged from the second compressor (202) to the second heat exchanger (204) and send the second refrigerant flowing from the third heat exchanger (302) to the second compressor (202). Additionally, the second switching valve (206) can send the second refrigerant discharged from the second compressor (202) to the third heat exchanger (302) and send the second refrigerant flowing from the second heat exchanger (204) to the second compressor (202).
[0088] The chiller includes a first liquid pipe (130) connecting a first heat exchanger (104) and a third heat exchanger (302), and a first supercooler (108) disposed in the first liquid pipe (130).
[0089] A first liquid refrigerant may flow through the first liquid pipe (130). The first supercooler (108) may expand a portion of the first refrigerant flowing through the first liquid pipe (130) and exchange heat with the refrigerant flowing through the first liquid pipe (130). A portion of the first refrigerant that is branched out from the first liquid pipe (130), expanded, and heat-exchanged may flow to the first compressor (102).
[0090] The chiller includes a first accumulator (110) that separates the first refrigerant flowing to the first compressor (102) and sends the first refrigerant in gaseous form to the first compressor (102). The chiller includes a first receiver (112) that stores a portion of the first refrigerant flowing through the first compressor (102).
[0091] The chiller includes a second liquid pipe (230) connecting a second heat exchanger (204) and a third heat exchanger (302), and a second supercooler (208) disposed in the second liquid pipe (230).
[0092] A second liquid refrigerant may flow through the second liquid pipe (230). The second subcooler (208) may expand a portion of the second refrigerant flowing through the second liquid pipe (230) and exchange heat with the refrigerant flowing through the second liquid pipe (230). A portion of the second refrigerant that is branched out from the second liquid pipe (230), expanded, and heat-exchanged may flow to the second compressor (202).
[0093] The chiller includes a second accumulator (210) that separates the second refrigerant flowing to the second compressor (202) and sends the gaseous second refrigerant to the second compressor (202). The chiller includes a second receiver (212) that stores a portion of the second refrigerant flowing through the second compressor (202).
[0094] The chiller includes a first expansion valve (114) that expands a first refrigerant flowing in a first liquid pipe (130) and a second expansion valve (214) that expands a second refrigerant flowing in a second liquid pipe (230).
[0095] The first expansion valve (114) includes a first-1 expansion valve (116) positioned adjacent to the first heat exchanger (104) and a first-2 expansion valve (118) positioned adjacent to the third heat exchanger (302).
[0096] The second expansion valve (214) includes a second-1 expansion valve (216) positioned adjacent to the second heat exchanger (204) and a second-2 expansion valve (218) positioned adjacent to the third heat exchanger (302).
[0097] Referring to Fig. 5, a control method for a chiller system will be explained.
[0098] First, the second operation mode (M2) is performed in step (S10). The second operation mode (M2) may be performed by the user's instruction. Additionally, the second operation mode (M2) may be performed when it is determined that cleaning of the strainer placed in a certain area is necessary using a separate sensor.
[0099] Afterward, a step (S20) for designating a strainer is performed. The step (S20) for designating a strainer may be performed by the user's selection. Additionally, in the step (S20) for designating a strainer, an area where cleaning of the strainer is determined to be necessary may be designated by a sensor placed in each of the plurality of recovery pipes (13, 23, 33).
[0100] After the step (S20) of designating a strainer, the valve in which the designated strainer is placed undergoes the step (S30) of closing the corresponding return pipe. As shown in FIG. 3, if a second strainer (25) is designated, the second return pipe (23) is closed.
[0101] However, the first recovery pipe (13) and the third recovery pipe (33), which are the remaining recovery pipes excluding the second recovery pipe (23), remain in an open state.
[0102] Afterwards, the connecting pipe valve goes through the step (S40) of opening the connecting pipe (50). Referring to FIG. 3, the first connecting pipe valve (52) and the second connecting pipe valve (54) can open the connecting pipe (50) to allow water to flow into the connecting pipe (50).
[0103] Afterwards, the designated drain valve goes through the step (S50) of opening the corresponding drain pipe. As shown in FIG. 3, when the second strainer (25) is designated, the second drain valve (27) opens the second drain pipe (26).
[0104] However, the first drain valve (17) closes the first drain pipe (16), and the third drain valve (37) maintains the state of closing the third drain pipe (36).
[0105] Therefore, the water flowing through the connecting pipe (50) flows back through the second recovery pipe (23), allowing foreign matter accumulated in the second strainer (25) to be discharged through the second drain pipe (26).
[0106] Afterwards, it is determined whether to additionally perform a second mode operation (S60), and if the second mode operation is additionally performed, the strainer can be re-designated and the above process can be repeated.
[0107] It is determined whether to additionally perform a second mode operation (S60), and if the second mode operation is not additionally performed, the first operation mode (M1) is performed (S70).
[0108] The first operating mode (M1) proceeds to the step (S80) in which each valve (14, 24, 34) placed in a plurality of recovery pipes (13, 23, 33) opens all of the plurality of recovery pipes (13, 23, 33). That is, each of the first valve (14), the second valve (24), and the third valve (34) opens all of the first recovery pipe (13), the second recovery pipe (23), and the third recovery pipe (33).
[0109] The first operating mode (M1) proceeds with the step (S90) of closing the connecting pipe (50) through the connecting pipe valves (52, 54). Accordingly, the flow of water through the connecting pipe (50) is stopped.
[0110] The first operating mode (M1) performs the step (S100) of closing all of the multiple drain pipes (16, 26, 36) by controlling the multiple drain valves (17, 27, 37).
[0111] That is, the first drain valve (17), the second drain valve (27), and the third drain valve (37) each close the first drain pipe (16), the second drain pipe (26), and the third drain pipe (36).
[0112] Referring to Fig. 6, a method for specifying a strainer is explained.
[0113] Describe one example step of specifying a strainer.
[0114] The second operating mode (M2) is performed (S10), and a step (S12) of detecting a plurality of flow sensors (not shown) is performed.
[0115] Each of the plurality of flow sensors can be placed in each of the plurality of recovery pipes (13, 23, 33). A first flow sensor (not shown) is placed in the first recovery pipe (13), and a second flow sensor (not shown) is placed in the second recovery pipe (23). A third flow sensor (not shown) is placed in the third recovery pipe (33).
[0116] Subsequently, a step (S14) of comparing the values detected by each of the multiple flow sensors is performed. The flow rates detected by each of the first flow sensor, the second flow sensor, and the third flow sensor are compared with each other.
[0117] Afterward, the step of designating a strainer (S20) is performed. A strainer placed in the return pipe where the flow sensor is located, where the flow rate value detected by the plurality of flow sensors is the lowest, can be designated.
Claims
1. A main supply pipe supplying heat-exchanged water to a heat demand point; Main return pipe through which water is recovered from the heat demand source; A first chiller comprising a first main body that heats or cools water through heat exchange with a refrigerant, a first recovery pipe connecting the first main body and the main recovery pipe, and a first supply pipe connecting the first main body and the main supply pipe; A second chiller comprising a second main body that heats or cools water through heat exchange with a refrigerant, a second recovery pipe connecting the second main body and the main recovery pipe, and a second supply pipe connecting the second main body and the main supply pipe; A connecting pipe connecting the first recovery pipe and the second recovery pipe; It includes a connecting pipe valve that opens and closes the above connecting pipe, and A chiller system in which the connecting pipe valve opens the connecting pipe when the first recovery pipe is closed or the second recovery pipe is closed.
2. In Paragraph 1, A first valve is disposed in the first recovery pipe to control the flow of water flowing to the first main body, and A second valve is disposed in the second recovery pipe to regulate the flow of water flowing to the second main body, and A chiller system in which the connecting pipe valve opens the connecting pipe when the first valve closes the first recovery pipe or the second valve closes the second recovery pipe.
3. In Paragraph 2, A first strainer for removing foreign substances from the water flowing through the first recovery pipe; It includes a second strainer for removing foreign substances from the water flowing through the second recovery pipe, and A chiller system in which, when removing foreign matter accumulated in the first strainer or the second strainer, the first valve closes the first recovery pipe or the second valve closes the second recovery pipe.
4. In Paragraph 3, A first drain pipe connected to the above-mentioned first recovery pipe, and It includes a second drain pipe connected to the second recovery pipe mentioned above, and The first strainer is positioned in the first recovery pipe between the first drain pipe and the connecting pipe, and The above second strainer is a chiller system disposed in the second recovery pipe between the above second drain pipe and the above connecting pipe.
5. In Paragraph 4, The first drain pipe is connected to the first recovery pipe between the first valve and the first strainer, and A chiller system in which the second drain pipe is connected to the first recovery pipe between the second valve and the second strainer.
6. In Paragraph 4, A first drain valve for opening and closing the first drain pipe, and It includes a second drain valve that opens and closes the second drain pipe, and A chiller system in which, when the first valve closes the first return pipe or the second valve closes the second return pipe, the first drain valve or the second drain valve disposed in the closed return pipe opens the first drain pipe or the second drain pipe.
7. In Paragraph 2, The above chiller system operates in a first mode that supplies water, which has been heat-exchanged in the first chiller and the second chiller, to the main supply pipe, and In the first mode above, A chiller system in which the connecting pipe valve closes the connecting pipe, and the first valve and the second valve open the first recovery pipe and the second recovery pipe.
8. In Paragraph 3, The chiller system above operates in a second mode to remove foreign substances accumulated in the first strainer or the second strainer, and In the above second mode, A chiller system in which the above connecting pipe valve opens the connecting pipe, and the above first valve or the above second valve closes the above first recovery pipe or the above second recovery pipe.
9. In Paragraph 8, A first drain pipe connected to the above-mentioned first recovery pipe, and A second drain pipe connected to the above second recovery pipe, and A first drain valve for opening and closing the first drain pipe, and It includes a second drain valve that opens and closes the second drain pipe, and In the above second mode, A chiller system in which the first drain valve or the second drain valve opens the first drain pipe or the second drain pipe.