Heat source system

Abstract

To improve the efficiency of a system as a whole.SOLUTION: A heat source system comprises: a plurality of thermal load devices 2 which can perform cold-heat using operations using cold heat; a cold heat supply part 3 which can supply heat media having cold heat accumulated in a heat accumulation tank 1 to the plurality of thermal load devices 2; a cooling heat source machine 4 for accumulating cold heat in the heat accumulation tank 1 by cooling heat accumulation water in the heat accumulation tank 1; and a control part 6 for controlling an operation state of the cooling heat source machine 4. When a heat accumulation water temperature of the heat accumulation tank 1 reaches an operation start temperature or higher, the control part 6 starts an operation of the cooling heat source machine 4, and can perform a rated capacity operation for continuing an operation of the cooling heat source machine 4 in a rated capacity state until an operation stop condition is satisfied.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a heat source system that utilizes cold heat stored in a heat storage tank. [Background technology]

[0002] As the heat source system described above, a system is known that includes a plurality of heat load devices (e.g., air conditioning devices) capable of performing cold energy utilization operation using cold energy, a cold energy supply unit that can supply a heat medium having cold energy stored in a heat storage tank to the plurality of heat load devices, a cooling heat source machine that cools the heat storage water in the heat storage tank and stores the cold energy in the heat storage tank, and a control unit that controls the operating state of the cooling heat source machine (see, for example, Patent Document 1).

[0003] In the system described in Patent Document 1, the heat storage tank has a low-temperature tank portion for storing low-temperature heat storage water and a high-temperature tank portion for storing high-temperature heat storage water. The cold heat supply unit is configured to be able to freely supply the heat storage water in the low-temperature tank portion of the heat storage tank to a plurality of heat load devices, and the cooling heat source machine cools the heat storage water in the high-temperature tank portion of the heat storage tank and returns the cooled heat source water to the low-temperature tank portion of the heat storage tank, thereby storing cold heat in the heat storage tank.

[0004] When the control unit controls the operating state of the cooling heat source machine, it starts operation with a preset initial number of units, and when the temperature of the heat storage water in the low-temperature tank of the heat storage tank exceeds the set temperature, it increases the number of operating units by one, and when the temperature of the heat storage water in the high-temperature tank of the heat storage tank falls below the set temperature, it decreases the number of operating units by one. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4569661 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the system described in Patent Document 1, in order to cover the cold heat load of multiple heat load devices, the operating state of the cooling heat source machine is controlled taking into consideration the heat storage status of the cold heat in the heat storage tank, but the cooling heat source machine is operated taking into consideration only the heat storage status of the cold heat in the heat storage tank, which may result in a decrease in the efficiency of the system as a whole due to an increase in the number of times the cooling heat source machine is operated, etc.

[0007] When operating the cooling heat source machine, pumps and other devices must also be operated to supply heat-storage water from the high-temperature tank in the heat storage tank to the cooling heat source machine.As the number of times the cooling heat source machine is operated increases, energy consumption also increases, resulting in a decrease in efficiency.

[0008] Furthermore, the operating efficiency of a cooling heat source machine changes depending on the capacity at which it is operated, but there is no description of the capacity at which the cooling heat source machine should be operated, and there is a demand for improving the operating efficiency of cooling heat source machines.

[0009] In view of this situation, a main object of the present invention is to provide a heat source system that can improve the efficiency of the entire system. [Means for solving the problem]

[0010] Original Akira is a plurality of heat load devices capable of performing a cold energy utilization operation using cold energy; a cold heat supply unit that can supply a heat medium having cold heat stored in a heat storage tank to a plurality of heat load devices; a cooling heat source machine that cools the heat storage water in the heat storage tank and stores cold heat in the heat storage tank; a control unit that controls the operating state of the cooling heat source machine, When there is a possibility that the cold heat loads of the plurality of heat load devices may not be covered by operating the cold heat supply unit and supplying the heat medium having the cold heat stored in the heat storage tank to the plurality of heat load devices, the control unit is configured to be able to freely execute rated capacity operation in which, when the temperature of the heat storage water in the heat storage tank becomes equal to or higher than an operation start temperature, the operation of the cooling heat source device is started and the cooling heat source device continues to operate at a rated capacity state until an operation stop condition is satisfied. This is preferable.

[0011] According to this configuration, the control unit executes rated capacity operation. When the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, the cooling heat source unit starts operation, thereby covering the cooling loads of the multiple heat load devices. Moreover, rated capacity operation allows the cooling heat source unit to operate at a rated capacity with high operating efficiency, thereby improving the operating efficiency of the cooling heat source unit. Furthermore, rated capacity operation operates the cooling heat source unit at its rated capacity regardless of the magnitude of the cooling loads of the multiple heat load devices. This may result in the cooling capacity output by the cooling heat source unit exceeding the cooling loads of the multiple heat load devices, resulting in excess cooling. In such cases, the excess cooling heat can be stored in the heat storage tank, thereby covering the cooling loads of the multiple heat load devices while simultaneously storing cooling heat in the heat storage tank. This storage of cooling heat in the heat storage tank extends the period until the next time the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, thereby reducing the number of times the cooling heat source unit is operated.

[0012] As a result of the above, it is possible to improve the operating efficiency by operating the cooling heat source machine at its rated capacity and reduce the number of times the cooling heat source machine is operated, thereby improving the efficiency of the entire system.

[0013] The present invention 1 The characteristic configuration includes a plurality of heat load devices capable of performing a cold energy utilization operation using cold energy; a cold heat supply unit that can supply a heat medium having cold heat stored in a heat storage tank to a plurality of heat load devices; a cooling heat source machine that cools the heat storage water in the heat storage tank and stores cold heat in the heat storage tank; a control unit that controls the operating state of the cooling heat source machine, the control unit is configured to be able to freely execute a rated capacity operation in which, when the temperature of the heat storage water in the heat storage tank becomes equal to or higher than an operation start temperature, the operation of the cooling heat source machine is started, and the cooling heat source machine continues to operate at a rated capacity state until an operation stop condition is satisfied; the heat storage tank has a low-temperature tank portion for storing low-temperature heat storage water and a high-temperature tank portion for storing high-temperature heat storage water, the cold energy supply unit is configured to be able to freely supply cold energy contained in the heat storage water in the low-temperature tank portion of the heat storage tank to a plurality of heat load devices; a heat storage water circulation unit that cools the heat storage water in the high temperature tank portion of the heat storage tank by the cooling heat source device and then returns the cooled heat storage water to the low temperature tank portion of the heat storage tank, The control unit executes the rated capacity operation when the temperature of the heat storage water in the low-temperature tank portion of the heat storage tank becomes equal to or higher than an operation start temperature for the low-temperature tank.

[0014] According to this configuration, the control unit executes rated capacity operation. When the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, the cooling heat source unit starts operation, thereby covering the cooling loads of the multiple heat load devices. Moreover, rated capacity operation allows the cooling heat source unit to operate at a rated capacity with high operating efficiency, thereby improving the operating efficiency of the cooling heat source unit. Furthermore, rated capacity operation operates the cooling heat source unit at its rated capacity regardless of the magnitude of the cooling loads of the multiple heat load devices. This may result in the cooling capacity output by the cooling heat source unit exceeding the cooling loads of the multiple heat load devices, resulting in excess cooling. In such cases, the excess cooling heat can be stored in the heat storage tank, thereby covering the cooling loads of the multiple heat load devices while simultaneously storing cooling heat in the heat storage tank. This storage of cooling heat in the heat storage tank extends the period until the next time the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, thereby reducing the number of times the cooling heat source unit is operated. As a result of the above, it is possible to improve the operating efficiency by operating the cooling heat source machine at its rated capacity and reduce the number of times the cooling heat source machine is operated, thereby improving the efficiency of the entire system. Furthermore, According to this configuration, the cold energy supply unit supplies the cold energy contained in the heat storage water in the low-temperature tank portion of the heat storage tank to the multiple heat load devices, allowing each of the multiple heat load devices to perform cold energy utilization operation by utilizing the cold energy contained in the heat storage water in its low-temperature tank portion. The control unit monitors the cold energy status of the heat storage water in the low-temperature tank portion supplied to the heat load device and performs rated capacity operation when the temperature of the heat storage water in that low-temperature tank portion reaches or exceeds the low-temperature tank operation start temperature. This allows the system to smoothly transition to a state in which the cooling heat source unit can cover the cold energy loads of the multiple heat load devices before the cold energy stored in the heat storage tank can no longer cover the cold energy loads of the multiple heat load devices. This allows the cooling heat source unit to appropriately cover the cold energy loads of the multiple heat load devices.

[0015] The present invention 2The characteristic configuration includes a plurality of heat load devices capable of performing a cold energy utilization operation using cold energy; a cold heat supply unit that can supply a heat medium having cold heat stored in a heat storage tank to a plurality of heat load devices; a cooling heat source machine that cools the heat storage water in the heat storage tank and stores cold heat in the heat storage tank; a control unit that controls the operating state of the cooling heat source machine, the control unit is configured to be able to freely execute a rated capacity operation in which, when the temperature of the heat storage water in the heat storage tank becomes equal to or higher than an operation start temperature, the operation of the cooling heat source machine is started, and the cooling heat source machine continues to operate at a rated capacity state until an operation stop condition is satisfied; the heat storage tank has a low-temperature tank portion for storing low-temperature heat storage water and a high-temperature tank portion for storing high-temperature heat storage water, the cold energy supply unit is configured to be able to freely supply cold energy contained in the heat storage water in the low-temperature tank portion of the heat storage tank to a plurality of heat load devices; a heat storage water circulation unit that cools the heat storage water in the high temperature tank portion of the heat storage tank by the cooling heat source device and then returns the cooled heat storage water to the low temperature tank portion of the heat storage tank, The control unit executes the rated capacity operation when the temperature of the heat storage water in the high temperature tank portion of the heat storage tank becomes equal to or higher than the operation start temperature for the high temperature tank.

[0016] According to this configuration, the control unit executes rated capacity operation. When the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, the cooling heat source unit starts operation, thereby covering the cooling loads of the multiple heat load devices. Moreover, rated capacity operation allows the cooling heat source unit to operate at a rated capacity with high operating efficiency, thereby improving the operating efficiency of the cooling heat source unit. Furthermore, rated capacity operation operates the cooling heat source unit at its rated capacity regardless of the magnitude of the cooling loads of the multiple heat load devices. This may result in the cooling capacity output by the cooling heat source unit exceeding the cooling loads of the multiple heat load devices, resulting in excess cooling. In such cases, the excess cooling heat can be stored in the heat storage tank, thereby covering the cooling loads of the multiple heat load devices while simultaneously storing cooling heat in the heat storage tank. This storage of cooling heat in the heat storage tank extends the period until the next time the temperature of the heat storage water in the heat storage tank reaches or exceeds the operation start temperature, thereby reducing the number of times the cooling heat source unit is operated. As a result of the above, it is possible to improve the operating efficiency by operating the cooling heat source machine at its rated capacity and reduce the number of times the cooling heat source machine is operated, thereby improving the efficiency of the entire system. Furthermore, According to this configuration , storageThe cooling heat source unit includes a heat storage water circulation unit that cools the heat storage water in the high-temperature portion of the heat tank using a cooling heat source unit and then returns the cooled heat storage water to the low-temperature portion of the heat storage tank. The cooling heat source unit therefore cools the heat storage water in the high-temperature portion. The control unit monitors the temperature of the heat storage water in the high-temperature portion of the heat storage unit, which is the target for cooling, and executes rated capacity operation when the temperature of the heat storage water in the high-temperature portion reaches or exceeds the operation start temperature for the high-temperature tank. This allows rated capacity operation to be executed at an appropriate timing to improve operating efficiency. This effectively improves the operating efficiency of the cooling heat source unit and the efficiency of the entire system.

[0017] The present invention 3 A characteristic feature of the present invention is that the operation stop condition is set to a condition that a predetermined time has elapsed since the cooling heat source machine started operating.

[0018] According to this configuration, the operation stop conditions can be set to simple conditions, and the operation of the cooling heat source machine can be stopped at a timing that allows the operating efficiency of the cooling heat source machine to be improved.

[0019] The present invention 4 A characteristic feature of the present invention is that the cooling heat source machine has the capacity to cover the cooling load when all of the plurality of heat load devices are operating in a cooling heat utilization mode.

[0020] According to this configuration, the cooling heat source machine has the capacity to cover the cooling load when all of the multiple heat load devices are operating in cold energy utilization mode, so the cooling capacity output by the cooling heat source machine becomes greater than the cooling load of the multiple heat load devices, and surplus cold energy is often generated. As a result, when the cooling heat source machine is operated once, the surplus cold energy can be efficiently stored in the heat storage tank, effectively reducing the number of times the cooling heat source machine is operated and effectively improving the efficiency of the entire system. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a diagram showing the flow state of fluid during cold heat storage operation in a schematic configuration of a heat source system. [Figure 2] FIG. 1 is a diagram showing the fluid flow state during cooling supply operation in a schematic configuration of a heat source system. [Figure 3] A diagram showing the fluid flow during cold heat storage and cold heat supply operation in the schematic configuration of the heat source system. [Figure 4] FIG. 1 is a diagram showing the fluid flow state during heat supply operation in the schematic configuration of a heat source system. [Figure 5] Flowchart showing the operation of cold heat supply operation and cold heat storage and cold heat supply operation [Figure 6] Graph showing the simulation results for the efficiency of the heat source system DETAILED DESCRIPTION OF THE INVENTION

[0022] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a heat source system according to the present invention will be described with reference to the drawings. As shown in Figures 1 to 4, this heat source system is installed in a building 7 having multiple spaces to be air-conditioned, and uses cold energy stored in a heat storage tank 1 to perform air conditioning and other operations in each of multiple heat load devices 2. Figures 1 to 4 all show the schematic configuration of the heat source system, so the following explanation will be based on Figure 1. In Figures 1 to 4, the parts through which the fluid flows are different, and the parts through which the fluid flows are indicated by thick lines.

[0023] In addition to the heat storage tank 1 and the plurality of heat load devices 2, the heat source system is equipped with a cold heat supply unit 3 that can supply a heat medium having cold heat stored in the heat storage tank 1 to the plurality of heat load devices 2, a cooling heat source machine 4 that cools the heat storage water in the heat storage tank 1 and stores cold heat in the heat storage tank 1, and a control unit 6 that controls the operation of the heat source system, such as the operating state of the cooling heat source machine 4.

[0024] The heat storage tank 1 has a low-temperature tank section 11 for storing low-temperature heat storage water, a high-temperature tank section 12 for storing high-temperature heat storage water, and an intermediate-temperature tank section 13 for storing heat storage water at an intermediate temperature between low and high temperatures. Heat storage water can flow between the low-temperature tank section 11 and the intermediate-temperature tank section 13, and can flow between the intermediate-temperature tank section 13 and the high-temperature tank section 12, and the heat storage water is stored in the heat storage tank 1 in a state where temperature stratification is formed in the order of the low-temperature tank section 11, the intermediate-temperature tank section 13, and the high-temperature tank section 12.

[0025] The cooling heat source device 4 is configured, for example, by a sealed cooling tower. In order to cool the heat storage water in the heat storage tank 1 with the cooling heat source device 4, a first heat storage water circulation path 41 (corresponding to a heat storage water circulation unit) is provided which extracts the heat storage water from the high temperature tank portion 12 of the heat storage tank 1, circulates it, and supplies it to the cooling heat source device 4, and returns the heat storage water which has passed through the cooling heat source device 4 to the low temperature tank portion 11 of the heat storage tank 1, and a first heat storage water circulation pump 42 (corresponding to a heat storage water circulation unit) is provided in a midway position of the first heat storage water circulation path 41. A first control valve 43 is provided in the first heat storage water circulation path 41 upstream of the cooling heat source device 4 in the flow direction of the heat storage water.

[0026] 1 , for example, as shown by the thick line in Fig. 1 , by operating the first heat-storage water circulation pump 42, the heat storage water is caused to flow from the high-temperature tank portion 12 of the heat storage tank 1 to the low-temperature tank portion 11 through the first heat-storage water circulation path 41 and the cooling heat source unit 4. At this time, by operating the cooling heat source unit 4, the heat storage water is cooled by the cooling heat source unit 4 and the cooled heat storage water is supplied to the low-temperature tank portion 11, allowing cold energy to be stored in the heat storage tank 1.

[0027] The cold energy supply unit 3 is equipped with a second heat-storage water circulation path 31 that extracts heat-storage water from the low-temperature tank portion 11 of the heat storage tank 1, circulates the heat-storage water, and returns it to the high-temperature tank portion 12 of the heat storage tank 1, a heat exchanger 32 disposed midway along the second heat-storage water circulation path 31, a heat medium outward path 33 that can supply the heat medium that has been heat-exchanged in the heat exchanger 32 to each of the plurality of heat load devices 2, and a heat medium return path 34 that returns the heat medium from each of the plurality of heat load devices 2 to the heat exchanger 32. Here, the heat medium may be, for example, heat source water, but any heat medium that can transfer heat may be used, and is not limited to heat source water, and other heat mediums may also be used.

[0028] 2 , the cold energy supply unit 3 is configured to circulate the heat storage water in the low-temperature tank portion 11 of the heat storage tank 1 through the second heat storage water circulation path 31 and circulate the heat medium through the heat medium outward path 33 and the heat medium return path 34, thereby exchanging heat between the heat storage water and the heat medium in the heat exchange unit 32 and transferring the cold energy contained in the heat storage water to the heat medium, thereby freely supplying the heat medium having the cold energy to each of the plurality of heat load devices 2. In this way, the cold energy supply unit 3 does not directly supply the heat storage water of the heat storage tank 1 to the heat load devices 2, but rather is able to freely supply the heat medium to which the cold energy contained in the heat storage water in the low-temperature tank portion 11 of the heat storage tank 1 has been transferred to each of the plurality of heat load devices 2.

[0029] The second heat-storage water circulation path 31 is provided with, from the upstream side in the flow direction of the heat-storage water, a heat exchanger 32 and a second heat-storage water circulation pump 35. By operating the second heat-storage water circulation pump 35, the heat-storage water is taken out from the low-temperature tank portion 11 of the heat storage tank 1 through the second heat-storage water circulation path 31, circulated, and supplied to the heat exchanger 32, and the heat-storage water that has passed through the heat exchanger 32 is returned to the high-temperature tank portion 12 of the heat storage tank 1.

[0030] The heat medium outbound path 33 is branched and connected to a plurality of branch paths, each connected to a plurality of heat load devices 2. The heat medium outbound path 33 is provided with a heat medium control valve 36 and a heat medium supply pump 37 upstream of the branch points of the plurality of branch paths in the heat medium flow direction. By controlling the open / close state of the heat medium control valve 36, it is possible to control the supply state, such as whether or not to supply heat medium to the plurality of heat load devices 2, and by controlling the operating state of the heat medium supply pump 37, it is possible to control the amount of heat medium supplied to the plurality of heat load devices 2.

[0031] The heat load device 2 is configured, for example, as an air conditioning device that uses the heat of a heat medium as a heat source to condition the space to be air-conditioned. The heat load device 2 is configured to be able to perform a cooling operation that cools the space to be air-conditioned by using the cold heat of the heat medium, and a heating operation that heats the space to be air-conditioned by using the hot heat of the heat medium. Here, the heat load device 2 can be any of a variety of devices, such as a heat utilization device that can perform a cold heat utilization operation that utilizes the cold heat of the heat medium and a hot heat utilization operation that utilizes the hot heat of the heat medium, and is not limited to an air conditioning device that conditions the space to be air-conditioned by using the heat of a heat medium.

[0032] When performing cooling operation, the heat load device 2 draws in a heat medium from the heat medium outward path 33, uses the cold heat contained in the heat medium, and returns the used heat medium to the heat medium return path 34. When performing heating operation, the heat load device 2 also draws in a heat medium from the heat medium outward path 33, uses the hot heat contained in the heat medium, and returns the used heat medium to the heat medium return path 34.

[0033] Each of the multiple heat load devices 2 is configured to be able to perform cooling or heating operation separately according to the load (request) of each air-conditioned space. For example, if there is a cooling load (cooling request) in summer, the heat load device 2 performs cooling operation, and if there is a heating load (heating request) in winter, the heat load device 2 performs heating operation. Also, in the intermediate period between summer and winter, there may be a cooling load (cooling request) in one air-conditioned space and a heating load (heating request) in another air-conditioned space, resulting in a mixture of cooling and heating loads. In such cases, there will be a mixture of heat load devices 2 performing cooling operation and heat load devices 2 performing heating operation.

[0034] In cases where a heat load device 2 performing cooling operation and a heat load device 2 performing heating operation are mixed, the temperature of the heat medium supplied to the multiple heat load devices 2 in the heat medium outflow path 33 is set to an intermediate temperature so that both the heat load device 2 performing cooling operation and the heat load device 2 performing heating operation can utilize the heat contained in the heat medium drawn in from the heat medium outflow path 33.

[0035] This heat source system is equipped with a cooling / heating heat source machine 5 in addition to a cooling heat source machine 4. This cooling / heating heat source machine 5 is configured, for example, as an air-cooled heat pump chiller, and is disposed between the cooling heat source machine 4 and a first heat-storage water circulation pump 42 in the flow direction of the heat storage water in a first heat-storage water circulation path 41. The first heat-storage water circulation path 41 is equipped with a bypass path 44 that bypasses the cooling / heating heat source machine 5, and when cooling or heating by the cooling / heating heat source machine 5 is not required, an open / close valve (not shown) is controlled to allow water to flow through the bypass path 44 in a state that bypasses the cooling / heating heat source machine 5.

[0036] The control unit 6 controls the operation of the heat source system by controlling the operating states of various devices such as the first heat storage water circulation pump 42, the first control valve 43, the second heat storage water circulation pump 35, the heat medium control valve 36, the heat medium supply pump 37, the cooling heat source unit 4, and the cooling / heating heat source unit 5. In addition, the control unit 6 acquires the operating status of the heat load devices 2, such as whether they are in cooling operation, heating operation, or stopped, through wireless or wired communication with the multiple heat load devices 2, and is aware of the overall heat load status of the multiple heat load devices 2 (the magnitude of the cooling load and heating load).

[0037] The control unit 6 is configured to be able to perform various operations such as a cold heat storage operation for storing cold heat in the heat storage tank 1, a cold heat supply operation for supplying the cold heat stored in the heat storage tank 1 to the heat load device 2, a cold heat storage / cold heat supply operation for storing cold heat in the heat storage tank 1 and supplying the cold heat to the heat load device 2, and a hot heat supply operation for supplying hot heat generated by the cooling / heating heat source machine 5 to the heat load device 2.

[0038] Each operation will be explained below with reference to Figures 1 to 4. In Figures 1 to 4, parts through which fluids flow are indicated by bold lines, and valves to be opened and devices to be operated are also indicated by bold lines.

[0039] (Cold heat storage operation) In the cold heat storage operation, as shown in FIG. 1 , the control unit 6 opens the first control valve 43 and operates the first heat-storage water circulation pump 42 to operate the cooling heat source unit 4. The heat storage water in the high-temperature tank portion 12 of the heat storage tank 1 flows through the first heat-storage water circulation path 41 to the low-temperature tank portion 11 while passing through the cooling heat source unit 4. At this time, the control unit 6 controls the on-off valve (not shown) to flow the heat storage water through the bypass path 44 in the first heat-storage water circulation path 41, thereby flowing the heat storage water while bypassing the cooling / heating heat source unit 5. The heat storage water in the high-temperature tank portion 12 is cooled by the cooling heat source unit 4, and the cooled heat storage water is supplied to the low-temperature tank portion 11 to store cold heat in the heat storage tank 1. Here, the control unit 6, for example, operates the cooling heat source unit 4 at rated capacity (capacity at which the operating efficiency of the cooling heat source unit 4 is high), thereby improving the operating efficiency of the cooling heat source unit 4 and thereby improving system efficiency.

[0040] Regarding the timing of executing the cold heat storage operation, the control unit 6 executes the cold heat storage operation during a time period when the heat load device 2 is not performing cooling or heating operation, such as at night, or during a time period when the heat load of the multiple heat load devices 2 is low overall. This allows cold heat to be stored in the heat storage tank 1 in a concentrated manner, enabling cold heat to be efficiently stored in the heat storage tank 1. The time period during which the cold heat storage operation is executed can be set as appropriate, for example, to a time period when there is no heat load or a time period when the heat load is low, depending on the past heat load status of the heat load device 2, etc. The amount of cold heat stored in the heat storage tank 1 during the cold heat storage operation can also be set as appropriate, for example, to estimate the amount of cold heat to be used the next day depending on the past heat load status of the heat load device 2, and set the estimated amount of cold heat as the amount of cold heat to be stored in the heat storage tank 1.

[0041] (Cooling supply operation) 2 , in the cold heat supply operation, the control unit 6 operates the second heat-storage water circulation pump 35, opens the heat medium control valve 36, and operates the heat medium supply pump 37. The heat storage water in the low-temperature tank portion 11 of the heat storage tank 1 flows through the second heat-storage water circulation path 31 and the heat exchanger 32 into the high-temperature tank portion 12, and the heat medium flows through the heat medium forward path 33 and the heat medium return path 34 in a state of circulating between the heat exchanger 32 and the heat load device 2. As a result, heat exchange occurs between the heat storage water in the low-temperature tank portion 11 and the heat medium in the heat exchanger 32, and the cold energy contained in the heat storage water in the low-temperature tank portion 11 is transferred to the heat medium, making it possible to supply the heat medium having the cold energy (heat medium at an intermediate temperature) to a plurality of heat load devices 2. With regard to the amount of heat medium supplied to the plurality of heat load devices 2, the control unit 6 controls the rotation speed of the heat medium supply pump 37 and the like in accordance with the magnitude of the heat load of the plurality of heat load devices 2 as a whole.

[0042] 2 shows a case where there are a mixture of heat load devices 2 performing cooling operation and heat load devices 2 performing heating operation, the number of heat load devices 2 performing cooling operation is greater than the number of heat load devices 2 performing heating operation, and the cooling load (cooling load) is greater than the heating load (heat load). In FIG. 2, the heat load devices 2 performing cooling operation are shown surrounded by a thick line, and the heat load devices 2 performing heating operation are shown surrounded by a thick dotted line.

[0043] In this case, because the number of heat load devices 2 performing cooling operation is greater than the number of heat load devices 2 performing heating operation, the temperature of the heat medium in the heat medium return path 34 rises, and the temperature of the heat medium returned to the heat exchange section 32 in the heat medium return path 34 rises above the intermediate temperature. Therefore, by performing heat exchange between the heat storage water in the low-temperature tank section 11 and the heat medium in the heat exchange section 32, the temperature of the heat medium is cooled to the intermediate temperature, and the intermediate-temperature heat medium can be supplied to the plurality of heat load devices 2 through the heat medium outward path 33. This allows both the heat load devices 2 performing cooling operation and the heat load devices 2 performing heating operation to utilize the cold heat of the heat medium to cover the cooling load, and the heat load devices 2 performing heating loads to perform cooling operation using the cold heat of the heat medium to cover the cooling load, and the heat load devices 2 performing heating loads to perform heating operation using the hot heat of the heat medium to cover the heating load.

[0044] Furthermore, although not shown, even when only heat load devices 2 performing cooling operation are present and there is only a cooling load, the temperature of the heat medium returned to the heat exchange section 32 in the heat medium return path 34 will rise above the intermediate temperature, and by heat exchanging between the heat storage water in the low-temperature tank section 11 and the heat medium in the heat exchange section 32, the temperature of the heat medium is cooled to the intermediate temperature, and the intermediate-temperature heat medium can be supplied to multiple heat load devices 2 through the heat medium forward path 33. As a result, in the heat load device 2 with a cooling load, the cold energy of the heat medium can be used to perform cooling operation and cover the cooling load.

[0045] Regarding the timing of executing the cold heat supply operation, the control unit 6 can start and stop the cold heat supply operation based on the overall heat load situation of the multiple heat load devices 2 and the temperature of the heat medium in the heat medium return path 34. For example, the control unit 6 can start the cold heat supply operation when the overall heat load situation of the multiple heat load devices 2 is a cooling load (cold heat load) only, or when a heating load and a cooling load are mixed and the cooling load (cold heat load) is greater than the heating load (heat load), and can stop the cold heat supply operation when the cooling load disappears. Furthermore, the control unit 6 can start the cold heat supply operation when the temperature of the heat medium in the heat medium return path 34 becomes equal to or higher than the intermediate temperature, and can stop the cold heat supply operation when the temperature of the heat medium in the heat medium return path 34 becomes lower than the intermediate temperature by a predetermined temperature.

[0046] (Cold heat storage / cold heat supply operation) In the cold heat storage / cold heat supply operation, as shown in Fig. 3, the control unit 6 opens the first control valve 43, operates the first heat-storage water circulation pump 42, and operates the cooling heat source unit 4 to simultaneously perform the cold heat storage operation (see Fig. 1) and the cold heat supply operation (see Fig. 2), while operating the second heat-storage water circulation pump 35, opens the heat medium control valve 36, and operates the heat medium supply pump 37. When operating the cooling heat source unit 4, the control unit 6 performs rated capacity operation, which operates the cooling heat source unit 4 at a rated capacity state (a capacity at which the operating efficiency of the cooling heat source unit 4 is high).

[0047] Incidentally, the control unit 6 controls an on-off valve (not shown) to pass heat storage water through the cooling / heating heat source machine 5 in the first heat storage water circulation path 41 and operate the cooling / heating heat source machine 5, thereby allowing the heat storage water to be cooled by the cooling / heating heat source machine 5. Therefore, for example, in the event of a breakdown or maintenance of the cooling heat source machine 4, the cooling / heating heat source machine 5 can be used as a backup heat source machine.

[0048] The heat storage water in the high temperature tank portion 12 of the heat storage tank 1 flows through the first heat storage water circulation path 41 and into the low temperature tank portion 11 while passing through the cooling heat source unit 4. Therefore, the heat storage water in the high temperature tank portion 12 is cooled by the cooling heat source unit 4, and the cooled heat storage water is supplied to the low temperature tank portion 11, storing cold heat in the heat storage tank 1. In addition, the heat storage water in the low temperature tank portion 11 of the heat storage tank 1 flows into the high temperature tank portion 12 while passing through the heat exchange unit 32 through the second heat storage water circulation path 31, and the heat medium flows in a state of circulating between the heat exchange unit 32 and the heat load device 2 through the heat medium outward path 33 and the heat medium return path 34. Therefore, in the heat exchange section 32, heat is exchanged between the heat storage water in the low-temperature tank section 11 and the heat medium, and the cold heat contained in the heat storage water in the low-temperature tank section 11 is transferred to the heat medium, making it possible to supply the heat medium containing the cold heat (heat medium at an intermediate temperature) to multiple heat load devices 2.

[0049] In this way, the heat storage water cooled by the cooling heat source unit 4 is supplied to the low-temperature tank portion 11 through the first heat storage water circulation path 41, while the heat storage water supplied to the low-temperature tank portion 11 is supplied directly to the heat exchange section 32 through the second heat storage water circulation path 31, where heat exchange between the heat storage water and the heat medium occurs in the heat exchange section 32. The heat medium cooled to an intermediate temperature by heat exchange in the heat exchange section 32 is supplied to the plurality of heat load devices 2, and cooling operation or heating operation is performed in each of the plurality of heat load devices 2 using the heat of the heat medium.

[0050] Incidentally, Fig. 3 also shows a case in which, in a state in which heat load devices 2 performing cooling operation and heat load devices 2 performing heating operation are mixed, the number of heat load devices 2 performing cooling operation is greater than the heat load devices 2 performing heating operation, and the cooling load (cooling load) is greater than the heating load (heat load), as in Fig. 2. In Fig. 3, the heat load devices 2 performing cooling operation are shown surrounded by a thick line, and the heat load devices 2 performing heating operation are shown surrounded by a thick dotted line.

[0051] Regarding the timing of executing the cold heat storage / cold heat supply operation, the cold heat stored in the heat storage tank 1 is consumed by performing the above-mentioned cold heat supply operation, so there is a possibility that the cold heat stored in the heat storage tank 1 alone will not be able to cover the cooling load (cold heat load) of the entire plurality of heat load devices 2. Therefore, when the temperature of the heat storage water in the heat storage tank 1 reaches or exceeds the operation start temperature, the control unit 6 starts the cold heat storage / cold heat supply operation, and continues to execute the cold heat storage / cold heat supply operation until the operation stop condition is satisfied.

[0052] Here, the start-up temperature can be set to a low-temperature tank start-up temperature (e.g., 28°C) corresponding to the heat storage water temperature in the low-temperature tank section 11 of the heat storage tank 1, or to a high-temperature tank start-up temperature (e.g., 32°C) corresponding to the heat storage water temperature in the high-temperature tank section 12 of the heat storage tank 1.

[0053] For example, when priority is given to covering the cooling load (cold load), the control unit 6 can switch to a state in which the operation start temperature is set to the operation start temperature for the low-temperature tank, whereas when priority is given to system efficiency, the control unit 6 can switch to a state in which the operation start temperature is set to the operation start temperature for the high-temperature tank. In this way, the control unit 6 can be freely switched automatically or manually by a user or the like between a state in which the operation start temperature is set to the operation start temperature for the low-temperature tank and a state in which the operation start temperature is set to the operation start temperature for the high-temperature tank, depending on various switching conditions. Furthermore, the timing for switching the setting of the operation start temperature can be switched automatically by the control unit 6 or manually by a user or the like, each time a cold heat storage / cold heat supply operation is performed or after a predetermined period of time has elapsed.

[0054] The operation stop condition is set to a condition that a predetermined time has elapsed since the cold heat storage / cold heat supply operation (cooling heat source unit 4) started. This allows the operation stop condition to be set to a simple condition, and the operation of the cooling heat source unit 4 can be stopped at a timing that allows the operating efficiency of the cooling heat source unit 4 to be improved.

[0055] In this cold heat storage and cold heat supply operation, the cooling heat source unit 4 is operated at rated capacity regardless of the overall heat load situation of the multiple heat load devices 2. Therefore, for example, when the overall heat load situation of the multiple heat load devices 2 is a small cooling load, excess cold heat will be generated while covering the cooling load, and this excess cold heat will be stored in the heat storage tank 1.

[0056] Here, the cooling heat source unit 4 has the capacity to cover the cooling load (cold heat load) when all of the multiple heat load devices 2 are operating in cooling mode. Even if all of the heat load devices 2 are operating in cooling mode and the cooling load (cold heat load) is at its maximum, by performing cold heat storage and cold heat supply operation, the cold heat generated in the cooling heat source unit 4 can be transferred to the heat medium via the heat exchange unit 32 and cooled to an intermediate temperature of the heat medium, and the intermediate-temperature heat medium can be supplied to all of the multiple heat load devices 2. Therefore, in all of the heat load devices 2, the cooling operation can be performed using the cold heat of the heat medium, and the cooling load (cold heat load) can be appropriately covered even when the cooling load (cold heat load) is at its maximum.

[0057] In this way, the cooling heat source unit 4 has the capacity to cover the cooling load (cold heat load) when all of the multiple heat load devices 2 are operating in cooling mode, and therefore, as described above, there are more opportunities to store excess cold heat in the heat storage tank 1 while covering the cooling load (cold heat load) of the entire multiple heat load devices 2. As a result, once the cooling heat source unit 4 is operated, excess cold heat can be effectively stored in the heat storage tank 1, and the period until the temperature of the heat storage water in the heat storage tank 1 reaches or exceeds the operation start temperature can be extended. Therefore, the number of times the cooling heat source unit 4 is operated can be reduced as much as possible, and system efficiency can be effectively improved.

[0058] (heat supply operation) 4, in the hot heat supply operation, the control unit 6 opens the first control valve 43, operates the first heat-storage water circulation pump 42, and operates the cooling / heating heat source unit 5, and also operates the second heat-storage water circulation pump 35, opens the heat medium control valve 36, and operates the heat medium supply pump 37. At this time, the control unit 6 controls the on-off valve (not shown) to flow the heat-storage water through the cooling / heating heat source unit 5 without flowing the heat-storage water through the bypass line 44 in the first heat-storage water circulation path 41.

[0059] The heat storage water in the high-temperature tank portion 12 of the heat storage tank 1 is returned to the heat storage tank 1 through the first heat storage water circulation path 41, passing through the cooling heat source unit 4 and the cooling / heating heat source unit 5 in that order. Because the cooling heat source unit 4 is stopped and the cooling / heating heat source unit 5 is operating, the heat storage water in the high-temperature tank portion 12 is heated by the cooling / heating heat source unit 5, and the heated heat storage water is returned to the heat storage tank 1. In addition, the heated heat storage water returned to the heat storage tank 1 flows directly through the second heat storage water circulation path 31 to the high-temperature tank portion 12, passing through the heat exchange unit 32, and the heat medium flows in a state of circulating between the heat exchange unit 32 and the heat load device 2 through the heat medium outward path 33 and the heat medium return path 34. Therefore, in the heat exchange section 32, heat is exchanged between the heated heat storage water returned to the heat storage tank 1 and the heat medium, and the warm heat contained in the heated heat storage water in the low-temperature tank section 11 is transferred to the heat medium, making it possible to supply the heat medium (heat medium at an intermediate temperature) having the warm heat to multiple heat load devices 2.

[0060] 4 shows a case where there are a mixture of heat load devices 2 performing cooling operation and heat load devices 2 performing heating operation, the number of heat load devices 2 performing heating operation is greater than the number of heat load devices 2 performing cooling operation, and the heating load (heat load) is greater than the cooling load (cooling load). In FIG. 4, the heat load devices 2 performing cooling operation are shown surrounded by a thick line, and the heat load devices 2 performing heating operation are shown surrounded by a thick dotted line.

[0061] In this case, because the number of heat load devices 2 performing heating operation is greater than the number of heat load devices 2 performing cooling operation, the temperature of the heat medium in the heat medium return path 34 drops, and the temperature of the heat medium returned to the heat exchange section 32 in the heat medium return path 34 drops below the intermediate temperature. Therefore, by heat exchanging heat between the heat storage water after heating in the low-temperature tank section 11 and the heat medium in the heat exchange section 32, the temperature of the heat medium is heated to the intermediate temperature, and the heat medium at the intermediate temperature can be supplied to the plurality of heat load devices 2 through the heat medium outward path 33. As a result, both the heat load devices 2 performing heating operation and the heat load devices 2 performing cooling operation can utilize the heat of the heat medium drawn in from the heat medium outward path 33. The heat load devices 2 performing heating operation can perform heating operation using the hot heat of the heat medium to cover the heating load, and the heat load devices 2 performing cooling load can perform cooling operation using the cold heat of the heat medium to cover the cooling load.

[0062] Regarding the timing of executing the hot heat supply operation, the control unit 6 can start and stop the hot heat supply operation based on the overall heat load situation of the multiple heat load devices 2 and the temperature of the heat medium in the heat medium return path 34. For example, the control unit 6 can start the hot heat supply operation when the overall heat load situation of the multiple heat load devices 2 is a heating load (hot heat load) only, or when a heating load and a cooling load are mixed and the heating load (hot heat load) is greater than the cooling load (cooling load), and can stop the hot heat supply operation when the heating load is eliminated. Furthermore, the control unit 6 can start the hot heat supply operation when the temperature of the heat medium in the heat medium return path 34 becomes equal to or lower than the intermediate temperature, and can stop the hot heat supply operation when the temperature of the heat medium in the heat medium return path 34 becomes higher than the intermediate temperature by a predetermined temperature.

[0063] The cold heat supply operation and cold heat storage / cold heat supply operation will be described below based on the flowchart of FIG.

[0064] First, the control unit 6 Cold and heat supply operationFor example, when there is only a cooling load (cold load), or when the cooling load (cold load) is larger than the heating load (heat load) in a state where both the heating load and the cooling load are present, the control unit 6 determines whether or not to execute the above (step #1). Cold and heat supply operation It has been determined that the following should be carried out.

[0065] Cold and heat supply operation When it is determined that the above should be executed, the control unit 6 Cold and heat supply operation (If step #1 is Yes, then step #2). Cold and heat supply operation By executing the above, as the cold energy stored in the heat storage tank 1 is consumed, the temperature of the heat storage water in the heat storage tank 1 changes, so the control unit 6 monitors how the temperature of the heat storage water in the heat storage tank 1 changes using a temperature sensor not shown in the figure.

[0066] When the temperature of the heat storage water in the heat storage tank 1 becomes equal to or higher than the operation start temperature, the control unit 6 Cold and heat supply operation and executes cold heat storage and cold heat supply operation (if Yes in step #3, step #4). If the operation start temperature is set to the operation start temperature for the low temperature tank, when the heat storage water temperature in the low temperature tank section 11 becomes equal to or higher than the operation start temperature for the low temperature tank, the control unit 6 executes cold heat storage and cold heat supply operation. Also, if the operation start temperature is set to the operation start temperature for the high temperature tank, when the heat storage water temperature in the high temperature tank section 12 becomes equal to or higher than the operation start temperature for the high temperature tank, the control unit 6 executes cold heat storage and cold heat supply operation.

[0067] If the operation stop condition is met during cold heat storage / cold heat supply operation, the control unit 6 stops the cold heat storage / cold heat supply operation (cooling heat source unit 4) (if Yes in step #5, step #6). The control unit 6 determines that the operation stop condition is met when a predetermined time has elapsed since the cold heat storage / cold heat supply operation (cooling heat source unit 4) started.

[0068] If the cooling load continues to exist when the cold heat storage / supply operation is stopped, the control unit 6 stops the cold heat storage / supply operation and switches to cold heat supply operation, so that the cooling load is met by the cold heat stored in the heat storage tank 1. After that, the system returns to the start and the above-mentioned operation is performed.

[0069] In this embodiment, a control configuration is adopted for the cold heat storage / cold heat supply operation in which the control unit 6 starts the cold heat storage / cold heat supply operation (operation of the cooling heat source unit 4) when the heat storage water temperature in the heat storage tank 1 reaches or exceeds the operation start temperature, and continues the cold heat storage / cold heat supply operation (operation of the cooling heat source unit 4) until an operation stop condition is met, that is, a predetermined time has passed since the start of the cold heat supply operation (operation of the cooling heat source unit 4).By adopting such a control configuration, the efficiency of the heat source system is confirmed by simulation, as shown in Fig. 6.

[0070] Figure 6 is a graph showing the numerical values of the efficiency of the heat source system when simulations are performed using three control configurations: A1, A2, and B. A1 is the simulation result when a control configuration is adopted in which, when the temperature of the heat storage water in the low-temperature tank portion 11 in the heat storage tank 1 reaches or exceeds the operation start temperature for the low-temperature tank, the cold heat storage and cold heat supply operation (operation of the cooling heat source unit 4) is started, and the cold heat storage and cold heat supply operation (operation of the cooling heat source unit 4) is continued until an operation stop condition is met, that is, a predetermined time has passed since the start of the cold heat supply operation (operation of the cooling heat source unit 4). A2 is a simulation result when a control configuration is adopted in which, when the temperature of the heat storage water in the high-temperature tank portion 12 in the heat storage tank 1 reaches or exceeds the operation start temperature for the high-temperature tank, cold heat storage / cold heat supply operation (operation of the cooling heat source unit 4) is started, and the cold heat storage / cold heat supply operation (operation of the cooling heat source unit 4) is continued until an operation stop condition is met, that is, a predetermined time has passed since the start of the cold heat supply operation (operation of the cooling heat source unit 4). B is a simulation result when a control configuration is adopted in which cold heat storage / cold heat supply operation (operation of the cooling heat source unit 4) is performed so that the temperature of the heat storage water in the low-temperature tank portion 11 in the heat storage tank 1 becomes a constant set temperature.

[0071] As shown in Fig. 6, the system efficiency (COP) is 2.17 in B, whereas the system efficiency (COP) is 2.46 in A1 and 2.48 in A2. A1 and A2 employ the control configuration of this embodiment, and it can be seen that the efficiency (COP) of the heat source system is improved compared to B.

[0072] Here, the temperature of the heat storage water stored in the heat storage tank 1 is set to a medium temperature range that is different from the normal temperature range, because the cooling heat source device 4 (cooling tower) is used as the main heat source. For example, the normal temperature range is set to 7°C or below for low-temperature heat storage water and 50°C or above for high-temperature heat storage water, but in this embodiment, the low-temperature heat storage water is set to a medium temperature range of 15 to 25°C, and the high-temperature heat storage water is set to a medium temperature range of 25 to 35°C. By setting the temperature range of the heat storage water to the medium temperature range in this way, the cooling heat source device 4 (cooling tower) can be effectively used, and the system efficiency of the heat source system can be effectively improved.

[0073] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

[0074] (1) In the above embodiment, the start-up temperature can be switched between a state in which it is set to the start-up temperature for the low-temperature tank (e.g., 28°C) corresponding to the heat storage water temperature in the low-temperature tank section 11 of the heat storage tank 1, and a state in which it is set to the start-up temperature for the high-temperature tank (e.g., 32°C) corresponding to the heat storage water temperature in the high-temperature tank section 12 of the heat storage tank 1. However, for example, the start-up temperature can be always set to the start-up temperature for the low-temperature tank (e.g., 28°C), or the start-up temperature can be always set to the start-up temperature for the high-temperature tank (e.g., 32°C).

[0075] (2) In the above embodiment, the condition for stopping operation is set to a condition that a predetermined time has elapsed since the cold heat storage / cold heat supply operation (cooling heat source unit 4) was started, but it can also be set to a condition that the temperature of the heat storage water in the heat storage tank 1 becomes equal to or lower than the temperature for stopping operation, and various other conditions can be set. [Explanation of symbols]

[0076] 1 Heat storage tank 2 Heat load device 3 Cold and heat supply section 4 Cooling heat source machine 6 Control Unit 11 Cold chamber part 12 High temperature tank part 41 1st thermal storage water circulation path (thermal storage water circulation section) 42 No. 1 heat storage water circulation pump (heat storage water circulation section)

Claims

1. a plurality of heat load devices capable of performing a cold energy utilization operation using cold energy; a cold heat supply unit that can supply a heat medium having cold heat stored in a heat storage tank to a plurality of heat load devices; a cooling heat source machine that cools the heat storage water in the heat storage tank and stores cold heat in the heat storage tank; a control unit that controls the operating state of the cooling heat source machine, the control unit is configured to be able to freely execute a rated capacity operation in which, when the temperature of the heat storage water in the heat storage tank becomes equal to or higher than an operation start temperature, the operation of the cooling heat source machine is started, and the cooling heat source machine continues to operate at a rated capacity state until an operation stop condition is satisfied; the heat storage tank has a low-temperature tank portion for storing low-temperature heat storage water and a high-temperature tank portion for storing high-temperature heat storage water, the cold energy supply unit is configured to be able to freely supply cold energy contained in the heat storage water in the low-temperature tank portion of the heat storage tank to a plurality of heat load devices; a heat storage water circulation unit that cools the heat storage water in the high temperature tank portion of the heat storage tank by the cooling heat source device and then returns the cooled heat storage water to the low temperature tank portion of the heat storage tank, The control unit executes the rated capacity operation when the temperature of the heat storage water in the low-temperature tank portion of the heat storage tank becomes equal to or higher than an operation start temperature for the low-temperature tank.

2. a plurality of heat load devices capable of performing a cold energy utilization operation using cold energy; a cold heat supply unit that can supply a heat medium having cold heat stored in a heat storage tank to a plurality of heat load devices; a cooling heat source machine that cools the heat storage water in the heat storage tank and stores cold heat in the heat storage tank; a control unit that controls the operating state of the cooling heat source machine, the control unit is configured to be able to freely execute a rated capacity operation in which, when the temperature of the heat storage water in the heat storage tank becomes equal to or higher than an operation start temperature, the operation of the cooling heat source machine is started, and the cooling heat source machine continues to operate at a rated capacity state until an operation stop condition is satisfied; the heat storage tank has a low-temperature tank portion for storing low-temperature heat storage water and a high-temperature tank portion for storing high-temperature heat storage water, the cold energy supply unit is configured to be able to freely supply cold energy contained in the heat storage water in the low-temperature tank portion of the heat storage tank to a plurality of heat load devices; a heat storage water circulation unit that cools the heat storage water in the high temperature tank portion of the heat storage tank by the cooling heat source device and then returns the cooled heat storage water to the low temperature tank portion of the heat storage tank, The control unit executes the rated capacity operation when the temperature of the heat storage water in the high temperature tank portion of the heat storage tank becomes equal to or higher than an operation start temperature for the high temperature tank.

3. The heat source system according to claim 1 or 2, wherein the operation stop condition is set to a condition that a predetermined time has elapsed since the cooling heat source machine started operating.

4. The heat source system according to any one of claims 1 to 3, wherein the cooling heat source machine has the capacity to cover the cooling load when all of the plurality of heat load devices are operating in a cooling heat utilization mode.

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