KR20240036385A - Chiller system and a control method the same - Google Patents

Abstract

The present invention relates to a chiller system and its control method. A chiller system according to the spirit of the present invention includes a cold water demand source using cold water; and a chiller module that supplies cold water to the cold water demand source. The chiller module includes: a compressor; A condenser that exchanges heat with the refrigerant compressed in the compressor with external air; An evaporator that performs heat exchange between cold water and refrigerant; an intake passage connected to the evaporator and guiding the flow of cold water from the cold water demand source to the chiller module; and a water outlet passage connected to the evaporator and guiding the flow of cold water from the chiller module to the cold water demand source, wherein the inlet passage includes a bypass passage that branches off from the inlet passage and bypasses it. It includes a plurality of cold water pumps that apply pressure so that cold water flows.

Description

Chiller system and its control method {Chiller system and a control method the same}

The present invention relates to a chiller system having a plurality of pumps and a control method thereof.

In general, a chiller supplies cold water to a cold water consumer and cools the cold water by heat exchange between a refrigerant circulating in the refrigeration system and cold water circulating between the cold water consumer and the refrigeration system. Chillers are large-capacity facilities and can be installed in large buildings.

A conventional chiller system includes a chiller unit and a demand station. The demand source can be understood as an air conditioning device that uses cold water.

The chiller unit includes a compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed in the compressor, an expansion device that depressurizes the refrigerant condensed in the condenser, and an evaporator that evaporates the refrigerant decompressed in the expansion device.

The refrigerant exchanges heat with outside air in the condenser and can exchange heat with cold water in the evaporator.

The chiller system includes a cold water pipe that connects the evaporator and a demand source to circulate cold water, and one or two pumps that are provided to the cold water pipe to generate cold water flow.

When the pump operates, cold water can flow from the evaporator to the consumer via the cold water pipe, from the consumer to the evaporator.

The evaporator is provided with a passage through which the refrigerant flows and a cold water passage through which cold water flows, and the refrigerant in the refrigerant passage and the cold water in the cold water passage can indirectly exchange heat with each other.

Chiller units may be provided in various sizes or capacities. The size or capacity of the chiller unit is a concept that corresponds to the capacity of the refrigeration system, that is, the refrigeration capacity, and can be expressed in units of refrigeration tons (RT, Refrigeration Ton).

Generally, as the capacity of the chiller unit increases, the volume of the chiller unit increases.

Once the size of the building where the chiller unit is installed or the air conditioning capacity is determined, the capacity of the chiller unit is determined, and the chiller unit is manufactured based on the determined capacity.

If a malfunction occurs in the chiller unit while using the chiller system, the operation of the entire chiller unit is restricted and a lot of time is spent to repair the chiller unit, which limits the operation of the building's air conditioning.

However, when a problem occurs with the pump or piping of such a chiller unit, a closed circuit cannot be formed based on each pump, so there is a problem in that the pump or piping must be replaced after stopping the product.

The preceding literature is as follows.

(1) Publication number (publication date): 10-2017-0087205 (2017.07.10)

(2) Title of invention: Chiller unit and chiller system including the same

The present invention was proposed to solve these problems, and its purpose is to provide a chiller system that increases the reliability of the pump and makes it easy to replace the pump.

In achieving this purpose, a plurality of pumps operating alternately are provided.

In addition, if replacement of some of the plurality of pumps is necessary, each pump is connected in a closed circuit so that replacement can be performed without stopping the chiller system.

The chiller system according to the first embodiment of the present invention includes a cold water demand source using cold water; and a chiller module that supplies cold water to the cold water demand source. The chiller module includes: a compressor; A condenser that exchanges heat with the refrigerant compressed in the compressor with external air; An evaporator that performs heat exchange between cold water and refrigerant; an intake passage connected to the evaporator and guiding the flow of cold water from the cold water demand source to the chiller module; and a water outlet passage connected to the evaporator and guiding the flow of cold water from the chiller module to the cold water demand source, wherein the inlet passage is a bypass passage branched from the inlet passage and bypassing it; so that the cold water flows. It includes a plurality of cold water pumps that apply pressure.

The water inlet flow path includes a branch portion that branches off the bypass flow path from the water inlet flow path; and a lamination portion located downstream of the branch portion and laminated from the bypass passage to the water intake passage.

The plurality of cold water pumps may include a first pump provided between the branch portion of the water flow passage and the joint portion and a second pump provided between the branch portion of the bypass passage and the joint portion. .

According to the second embodiment of the present invention, the water flow path may further include a flow switching valve that is selectively provided in the branch portion and the joint portion to switch the flow of cold water.

The flow switching valve may further include a first flow switching valve provided on the branch part and a second flow switching valve provided on the joining part.

The water flow path according to the third embodiment of the present invention includes a flow switching valve provided in the branch portion; It may further include a valve provided between the lamination part and the first pump and between the lamination part and the second pump, and the valve may be selectively provided with an on-off valve or a check valve.

The water flow path according to the fourth embodiment of the present invention includes a flow conversion valve provided in the lamination part; It further includes valves respectively provided between the branch and the first pump and between the branch and the second pump, and the valve may optionally be provided with an on-off valve or a check valve.

The water flow path according to the seventh embodiment of the present invention is between the lamination part and the first pump, between the lamination part and the second pump, between the branch part and the first pump, and between the branch part and the first pump. It further includes a valve provided between the two pumps, and the valve may optionally be provided with an on-off valve or a check valve.

It is provided in the inlet flow path and may further include a pressure sensor that measures the pressure of the incoming cold water.

The pressure sensor is provided in plurality, and the pressure sensor includes: a first pressure sensor located between the cold water demand source and the branch portion; And it may include a second pressure sensor located between the evaporator and the bonding part.

It is provided in the water outlet flow path and may include a flow switch that measures the flow of cold water in the water outlet flow path.

The chiller module includes a controller that controls the cold water pump, wherein the controller includes a control unit that controls the cold water pump and the valve, a detection unit that detects various signals, and a cumulative operating time of the cold water pump and a switch. It may include a storage unit that stores signals.

A method of controlling a chiller system according to another object of the present invention includes, when operation begins, selecting a cold water pump to be operated among a plurality of cold water pumps in the chiller module; Comparing cumulative operation times of the plurality of cold water pumps; Operating a cold water pump with a smaller cumulative operating time among the plurality of cold water pumps; Determining whether the movable pump is broken; stopping the movable pump when it is determined that the movable pump is malfunctioning; switching the valve to an inactive pump flow path; activating the non-operating pump; A step of determining whether the newly operated pump is broken is included.

In the step of determining whether the movable pump is broken, if it is recognized that there is a flow of cold water in the flow switch, the movable pump may be determined to be in normal operation.

In the step of determining whether the movable pump is broken, if the differential pressure of the plurality of pressure sensors is greater than the set pressure, the movable pump may be determined to be in normal operation.

In the step of determining whether the movable pump is broken, if it is recognized that there is a flow of cold water in the flow switch and the differential pressure of the plurality of pressure sensors is greater than the set pressure, it may be determined that the movable pump is operating normally.

According to the present invention, even if one pump breaks down while using the chiller system, the other pump can be driven, so the chiller system can be operated continuously.

In addition, by determining the cumulative operation time of each pump, pumps with less accumulated operation time can be used preferentially, thereby improving the lifespan and reliability of the pump.

Additionally, there is an advantage that a pump that malfunctions or fails can be replaced even while the chiller system is in operation.

Figure 1 is a diagram showing the flow of cold water in a chiller system according to a first embodiment of the present invention.
Figure 2 is a diagram showing the cold water flow when a different pump is used in the first embodiment.
Figure 3 shows a chiller system according to a second embodiment of the present invention.
Figure 4 shows a chiller system according to a third embodiment of the present invention.
Figure 5 shows a chiller system according to a fourth embodiment of the present invention.
Figure 6 shows a chiller system according to a fifth embodiment of the present invention.
Figure 7 shows a chiral system according to a sixth embodiment of the present invention.
Figure 8 shows a chiller system according to a seventh embodiment of the present invention.
Figure 9 is a diagram showing the configuration of a controller of a chiller system according to an embodiment of the present invention.
Figure 10 is a diagram of a method for controlling a chiller module according to a second embodiment of the present invention.
Figure 11 is a diagram of another control method of the chiller module according to the second embodiment of the present invention.
Figure 12 is a diagram of another control method of a chiller module according to a second embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and a person skilled in the art who understands the spirit of the present invention will be able to easily suggest other embodiments within the scope of the same spirit.

Figure 1 is a diagram showing the cold water flow of the chiller system according to the first embodiment of the present invention, and Figure 2 is a diagram showing the cold water flow when a different pump is used in the first embodiment.

Referring to Figures 1 and 2, the chiller system 1 according to an embodiment of the present invention includes a chiller module 10 in which a refrigeration cycle is formed, and cold water in which cold water that exchanges heat with the chiller module 10 circulates. Sources of demand (20) are included. The cold water demand source 20 may be understood as a device or space that performs air conditioning using cold water. The chiller system 1 may further be provided with a cooling tower (not shown) in which cooling water is stored. A cooling water circulation passage may be provided between the chiller module 10 and the cooling tower. The cooling water circulation passage may be connected to the condenser of the chiller module 10.

The cold water demand source 20 may be a water-cooled air conditioner that exchanges heat with air and cold water. For example, the cold water demand source 20 includes an air handling unit (AHU, Air Handling Unit) that mixes indoor air and outdoor air, exchanges heat with cold water, and discharges the mixed air into the room. It is installed indoors and mixes indoor air with cold water. At least one unit may be included among a fan coil unit (FCU, Fan Coil Unit) that exchanges heat with and then discharges the heat into the room, and a floor piping unit buried in the floor of the room.

The chiller module 10 includes the cold water demand source 20 and a cold water circulation passage 100 for circulating cold water. The cold water circulation passage 100 is an inlet passage 101 that guides cold water from the cold water demand source 20 to the evaporator 160, and allows cold water cooled in the evaporator 160 to flow to the cold water demand source 20. It includes a guiding water outlet passage (102).

The water intake passage 101 is provided with a plurality of cold water pumps 120 driven to flow cold water.

The water intake passage 101 includes a branch portion 101a branched from one side of the water water passage 101. The water flow passage 101 may further include a bypass passage 103 extending from the branch portion 101a. The water flow path 101 may further include a joining portion 101b that reconnects the water water flow path 101 from the bypass flow path 103.

The plurality of cold water pumps 120 are provided in the water intake passage 101 and include a first pump 121 provided between the branch portion 101a and the joining portion 101b.

The plurality of cold water pumps 120 further include a second pump 122 provided in the bypass passage 103. Accordingly, even if one of the cold water pumps 120 fails, the other pump can operate, thereby ensuring a stable supply of cold water. In addition, by operating the plurality of cold water pumps 120 alternately, the burden on one cold water pump 120 can be reduced, thereby improving the lifespan and reliability of the cold water pump 120.

For example, when the chiller system 1 is operating, the first pump 121 and the second pump 122 may be driven alternately.

Figure 1 shows a state in which the first pump 121 of the water flow path 101 is driven and the second pump 122 is not driven. Since the second pump 122 is not operating, cold water flows into the evaporator 160 along the water intake passage 101.

Figure 2 shows a state in which the first pump 121 of the water flow path 101 is not driven and the second pump 122 is driven. Since the first pump 121 does not operate, cold water flows from the branch portion 101a to the bypass passage 103. Cold water flowing into the bypass passage 103 flows from the lamination portion 101b toward the evaporator 160.

Various valves 110 for controlling the flow of cold water may be provided in the water intake passage 101, the bypass passage 103, the branch portion 101a, and the joining portion 101b. This will be described later.

A pressure sensor 130 that measures the pressure of cold water may be further provided in the water flow path 101. The pressure sensor 130 is a first pressure sensor 131 provided upstream of the branch portion 101a in the water intake passage 101, and provided downstream of the joining portion 101b in the water water passage 101. It may include a second pressure sensor 132.

The first pressure sensor 131 can measure the pressure of cold water flowing in from the cold water demand source 20.

The second pressure sensor 132 can measure the pressure of cold water passing through the cold water pump 120.

A flow switch 160 that measures the flow of cold water may be provided in the water outlet passage 102.

The chiller module 10 includes a compressor 140 that compresses the refrigerant, a condenser 150 into which the high-temperature, high-pressure refrigerant compressed in the compressor 140 flows, and the refrigerant condensed in the condenser 150 is decompressed. It includes an expansion device 180 that evaporates the refrigerant decompressed in the expansion device 180 and an evaporator 160.

The chiller module 10 includes a suction pipe 104 provided on the inlet side of the compressor 140 and guiding the refrigerant discharged from the evaporator 150 to the compressor 140, and a suction pipe 104 of the compressor 140. A discharge pipe 105 provided on the outlet side and guiding the refrigerant discharged from the compressor 140 to the condenser 150, and a connection pipe guiding the refrigerant discharged from the condenser 150 to the evaporator 160 ( 106) are further included. The expansion device 180 may be provided in the connecting pipe 106.

The chiller module 10 may be provided with a controller 190 that controls the plurality of cold water pumps 120 and the plurality of valves 110.

Figure 3 shows a chiller system according to a second embodiment of the present invention.

Referring to Figure 3, according to the second embodiment of the present invention, a flow switching valve that switches the flow of refrigerant may be provided in the branch portion (101a) and the joining portion (101b). A three-way valve may be provided as the flow switching valve.

The flow switching valve may include a first flow switching valve 111 and a second flow switching valve 112.

For example, the first flow switching valve 111 may be installed in the branch part 101a, and the second flow switching valve 112 may be installed in the joining part 101b.

For example, if there is a problem with the first pump 121, the first flow switching valve 111 can flow cold water to the bypass passage 103, and the second flow switching valve 112 may be switched to discharge cold water from the bypass passage 103 toward the evaporator 160.

For example, when there is a problem with the second pump 122, the first flow switching valve 111 and the second flow switching valve 112 are switched so that cold water does not flow into the bypass flow path 103. It can be.

Figure 4 shows a chiller system according to a third embodiment of the present invention.

Referring to Figure 4, a first flow switching valve 111 is provided in the branch portion 101a, and an on-off valve 113 is provided between the first pump 131 and the joining portion 101b. And, a check valve 115 may be provided between the second pump 132 and the bonding portion 101b.

For example, if there is a problem with the first pump 121, the first flow switching valve 111 may be switched to flow cold water into the bypass passage 103. The check valve 115 may be opened to allow cold water to flow from the second pump 122 to the joining portion 101b. The on-off valve 113 can prevent cold water from flowing into the first pump 131 from the bonding portion 101b in a closed state.

For example, when there is a problem with the second pump 122, the first flow switching valve 111 flows cold water into the water intake passage 101, and cold water does not flow into the bypass passage 103. It can be switched to avoid it. The on-off valve 113 may be opened to allow cold water to flow through the water intake passage 101, and the check valve 115 may be closed to prevent cold water from flowing into the second pump 122.

In this way, when each cold water pump 120 has a problem, the cold water pump 120 with a problem can be isolated in a closed circuit.

Figure 5 shows a chiller system according to a fourth embodiment of the present invention.

Referring to FIG. 5, the first flow switching valve 111 is provided in the branch portion 101a, and a first check valve 115a is provided between the first pump 131 and the joining portion 101b. provided, and a second check valve 115b may be provided between the second pump 132 and the bonding portion 101b.

For example, if there is a problem with the first pump 121, the first flow switching valve 111 may be switched to flow cold water to the bypass passage 103, and the check valve 115 can be opened to allow cold water to flow from the second pump 122 to the joining portion 101b. The on-off valve 113 is closed to prevent cold water from flowing into the first pump 131 from the joining portion 101b.

For example, if there is a problem with the second pump 122, the first flow switching valve 111 is switched to flow cold water into the water flow path 101, and cold water flows into the bypass flow path 103. It can be prevented from flowing. The first check valve 115a is opened so that cold water flows from the first pump 121 toward the evaporator 160, and cold water flows into the second pump 122. To prevent this, the second check valve 115b may be closed.

In this way, when each cold water pump 120 has a problem, the cold water pump 120 with a problem can be isolated in a closed circuit.

Figure 6 shows a chiller system according to a fifth embodiment of the present invention.

Referring to FIG. 6, a first flow switching valve 111 is provided in the branch portion 101a, and a first on-off valve 113a is provided between the first pump 131 and the joining portion 101b. provided, and a second on-off valve 113b may be provided between the second pump 132 and the joining portion 101b.

For example, if there is a problem with the first pump 121, the first flow switching valve 111 may be switched to flow cold water to the bypass passage 103, and the second on-off valve (113b) may be opened to allow cold water to flow from the second pump 122 to the joining portion (103b). The first on-off valve 113a is closed and can prevent the flow from the joining portion 101b into the first pump 121.

For example, when there is a problem with the second pump 122, the first flow switching valve 111 flows cold water into the intake passage 101 and prevents cold water from flowing into the bypass passage 103. can be switched. The first on-off valve (113a) is opened so that cold water flows through the water flow passage 101, and the second on-off valve (113b) is opened to prevent cold water from flowing into the second pump 122. It can be closed.

Figure 7 shows a chiller system according to a sixth embodiment of the present invention.

Referring to FIG. 7, a second flow switching valve 112 is provided in the joining portion 101b, and a first on-off valve 113a is provided between the first pump 131 and the branch portion 101a. provided, and a second on-off valve 113b may be provided between the second pump 132 and the branch portion 101a.

For example, if there is a problem with the first pump 121, the first on-off valve 113a may be closed to prevent cold water from flowing into the first pump 121. The second on-off valve 113b may be opened to allow cold water to flow into the bypass passage 103. The two-flow switching valve 112 can be switched to allow cold water to flow from the bypass passage 103 to the evaporator 160.

For example, if there is a problem with the second pump 122, the second on-off valve 113b is closed to prevent cold water from flowing into the second pump 122, and the first on-off valve 113a is closed. can be opened to allow cold water to flow into the first pump 121. The second flow switching valve 112 can be switched to allow cold water to flow only into the evaporator 160.

Figure 8 shows a chiller system according to a seventh embodiment of the present invention.

Referring to FIG. 8, the chiller module 10 in FIG. 7 does not have a flow switching valve 112, and the first pump ( 122) and a configuration for controlling cold water flowing to the second pump 122.

The on-off valve 113 and the check valve 115 are between the first pump 121 and the branch portion 101a, between the first pump 121 and the joining portion 101b, and It may be selectively provided between the second pump 122 and the branch portion 101a and between the second pump 122 and the joining portion 101b.

For example, when an abnormality occurs in the cold water pump 120, the valve 110 on the side of the cold water pump 120 where the abnormality occurred is closed, and the valve 110 on the normally operating cold water pump 120 side is opened. You can.

Figure 9 is a diagram showing the configuration of a controller of a chiller system according to an embodiment of the present invention.

Referring to FIG. 9, the controller 190 may include a control unit 191, a detection unit 192, and a storage unit 193.

The control unit 191 may control the cold water pump 120, the flow switching valve 10, the on-off valve 113, and the check valve 115.

The detection unit 192 can detect the pressure of cold water detected by the pressure sensor 130, and the flow switch 170 can detect the flow of cold water in the water outlet passage 102.

For example, it can be determined whether the cold water pump 120 is operating normally by comparing the differential pressures of the first pressure sensor 131 and the second pressure sensor 132.

For example, it can be determined whether the cold water pump 120 is operating normally by determining whether the cold water flow signal from the flow switch 170 is input.

For example, the control unit 191 may control the valve 110 to allow cold water to flow toward the normally operating cold water pump 120.

The storage unit 193 can store the cumulative operating times of the first pump 121 and the second pump 122, respectively, and can store information detected by the detection unit 192.

For example, the control unit 191 compares the accumulated operation time of the first pump 121 and the second pump 122 stored in the storage unit 193, and selects the cold water pump ( 120) can be operated. The control unit 191 may control the valve 110 according to the operating cold water pump 120.

Figure 10 is a flow chart related to a control method of the chiller module according to the second embodiment of the present invention, Figure 11 is a flow chart related to another control method of the chiller module according to the second embodiment of the present invention, and Figure 12 is This is a flow chart regarding another control method of a chiller module according to the second embodiment of the present invention.

Referring to FIG. 10, when the operation of the chiller module 10 is input, a step of selecting which of the plurality of cold water pumps 120 to operate may be performed (S10).

In selecting the cold water pump 120, the accumulated operating time of the first pump 121 and the accumulated operating time of the second pump 122 stored in the storage unit 193 may be compared (S11).

If the cumulative operating time of the first pump 121 is less than or equal to the cumulative operating time of the second pump 122, the first pump 121 is operated (S12).

If the cumulative operating time of the first pump 121 exceeds the cumulative operating time of the second pump 122, the second pump 122 is operated (S13). That is, the cold water pump with a small accumulated operating time It can be a movable pump. For example, in step S11, when the operating pump is the first pump 121, the non-operating pump may be the second pump 122.

In order to determine whether the movable pump operates normally, a step of determining whether the movable pump is broken is performed (S14).

In order to determine whether the movable pump is broken, it can be determined whether the flow of cold water is detected by the flow switch 170 (S15).

When the flow switch 170 detects that cold water is flowing in the water outlet passage 102, it can be determined that the movable pump is operating normally (S16).

When the flow switch 170 detects that cold water is not flowing in the water outlet passage 102, it may be determined that the movable pump is not operating normally (S17). Accordingly, the operating pump that is not operating normally can be stopped (S18).

When the operating pump is stopped, the valve 110 can be adjusted so that cold water flows toward the non-operating pump (S19).

For example, if the valve 110 is not a flow switching valve, the valve in the flow path on the operative pump side may be closed and the valve in the flow path on the non-operating pump side may be opened.

Due to the switching of the cold water flow path as described above, when one cold water pump malfunctions, another pump is used, which has the advantage of being able to continuously supply cold water to cold water customers even while the malfunctioning pump is being replaced.

After the valve is switched to the flow path on the non-operating pump side, the non-operating pump can be operated (S20). For example, in step S11, when the operating pump is the first pump 121, the non-operating pump may be the second pump 122.

In order to determine whether the movable pump operates normally in step S20, a cold water flow signal detected by the flow switch 170 may be determined (S21).

If it is determined that there is a cold water flow signal in the flow switch 170, it can be determined that the movable pump is operating normally (S22).

For example, the operating pump in step S22 may be the second pump 122, and the operating pump in step S16 may be the first pump 121.

If it is determined that the operating pump is operating normally, operation may continue until the operation stop input of the chiller module 10 is completed (S23).

It is determined whether the operation of the chiller module 10 is stopped (S24), and if the operation of the chiller module 10 is not determined, the process returns to the step of selecting the cold water pump 120 (S11).

When the operation stop of the chiller module 10 is input, the operation of the cold water pump 120 may be stopped and the operation may be stopped.

Referring to FIG. 11, conditions for determining whether the operating cold water pump is broken may be set differently.

In the step S11 of determining whether the failure occurs, it can be determined whether the differential pressure of the pressure sensor 130 is greater than or equal to the set pressure.

For example, the differential pressure of the pressure sensor 130 may be a value obtained by subtracting the pressure value measured by the first pressure sensor 131 from the pressure value measured by the second pressure sensor 132.

For example, when the movable pump is operating normally, the pressure measured by the first pressure sensor 131 is smaller than the pressure measured by the second pressure sensor 132.

When the differential pressure of the pressure sensor 130 is greater than or equal to the set pressure, it may be determined that the movable pump is operating normally.

If the differential pressure of the pressure sensor 130 is less than the set pressure, the movable pump may malfunction and the pressure value measured by the second pressure sensor 132 may be determined to be low. Accordingly, it may be determined that the movable pump is malfunctioning.

Referring to FIG. 12, conditions for determining whether the operating cold water pump is broken may be set differently.

In the step (S11) of determining whether the failure occurs, if a cold water flow signal is detected by the flow switch 170 and the differential pressure of the pressure sensor 130 is more than the set pressure, it is determined that the movable pump is operating normally. You can. Therefore, it is possible to more accurately determine whether the operating pump is malfunctioning.

100: Circulation flow path 101: Intake flow path
101a: branch part 101b: joint part
102: Outlet flow path 103: Bypass flow path
110: Valve 111: First flow conversion valve
112: Second flow conversion valve 113: On-off valve
115: check valve 121: first pump
122: Second pump

Claims (16)

Cold water consumers using cold water; and
A chiller module that supplies cold water to the cold water demand source;
The chiller module includes: a compressor; A condenser that exchanges heat with the refrigerant compressed in the compressor with external air; An evaporator that performs heat exchange between cold water and refrigerant; an intake passage connected to the evaporator and guiding the flow of cold water from the cold water demand source to the chiller module; and
A water outlet passage connected to the evaporator and guiding the flow of cold water from the chiller module to the cold water demand source,
The above access channels are:
a bypass flow path branched from the water intake flow path and bypassing the water supply flow path;
A chiller system including a plurality of cold water pumps that apply pressure so that cold water flows. According to claim 1,
The above access channels are:
A branch portion branching the bypass flow path from the water flow path; and
The chiller system further includes a lamination portion located downstream of the branch portion and laminated from the bypass passage to the water intake passage. According to claim 2,
The plurality of cold water pumps,
A first pump provided between the branch portion of the water flow path and the joint portion, and
A chiller system including a second pump provided between the branch portion of the bypass flow path and the joint portion. According to claim 3,
The above access channels are:
The chiller system further includes a flow switching valve that is selectively provided in the branch portion and the joint portion to switch the flow of cold water. According to claim 4,
The flow switching valve is,
A chiller system including a first flow switching valve provided in the branch portion and a second flow switching valve provided in the joining portion. According to claim 3,
The above access channels are:
A flow switching valve provided at the branch portion;
It further includes; a valve provided between the lamination part and the first pump and between the lamination part and the second pump, respectively,
A chiller system in which an on-off valve or check valve is optionally provided for the valve. According to claim 3,
The above access channels are:
A flow conversion valve provided in the joining portion;
It further includes a valve provided between the branch and the first pump and between the branch and the second pump, respectively,
A chiller system in which an on-off valve or check valve is optionally provided for the valve. According to claim 3,
The above access channels are:
It further includes valves provided between the lamination portion and the first pump, between the lamination portion and the second pump, between the branch portion and the first pump, and between the branch portion and the second pump,
A chiller system in which an on-off valve or check valve is optionally provided for the valve. According to claim 3,
A chiller system provided in the inlet flow path and further comprising a pressure sensor that measures the pressure of the incoming cold water. According to clause 9,
The pressure sensor is provided in plural numbers,
The pressure sensor is,
A first pressure sensor located between the cold water demand source and the branch portion; and
A chiller system including a second pressure sensor located between the evaporator and the bonding part. According to claim 1,
A chiller system provided in the water outlet passage and including a flow switch that measures the flow of cold water in the water outlet passage. According to claims 6 to 8,
In the chiller module,
It includes a controller that controls the cold water pump,
The controller is a chiller system including a control unit that controls the cold water pump and the valve, a detection unit that detects various signals, and a storage unit that stores the accumulated operation time of the cold water pump and the signal of the switch. When operation begins, selecting a cold water pump to operate among a plurality of cold water pumps in the chiller module;
Comparing cumulative operation times of the plurality of cold water pumps;
Operating a cold water pump with a smaller cumulative operation time among the plurality of cold water pumps;
Determining whether the movable pump is broken;
stopping the movable pump when it is determined that the movable pump is malfunctioning;
switching the valve to an inactive pump flow path;
activating the non-operating pump;
A control method of a chiller system including the step of determining whether a newly operated pump is broken. According to claim 13,
The step of determining whether the movable pump is broken is,
A chiller system control method that determines the operating pump to be in normal operation when the flow switch recognizes that there is a flow of cold water. According to claim 13,
The step of determining whether the movable pump is broken is,
A chiller system control method that determines the operating pump to be in normal operation when the differential pressure of multiple pressure sensors is greater than the set pressure. According to claim 13,
The step of determining whether the movable pump is broken is,
A chiller system control method for determining normal operation of an operating pump when the flow switch recognizes that there is a flow of cold water and the differential pressure of the plurality of pressure sensors is greater than the set pressure.

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