Cold and hot water supply system

Abstract

To provide a cold and hot water supply system for supplying cold water and hot water generated in a cold water generation part and a hot water generation part to a cold water utilization part and a hot water utilization part, for actualizing further space saving, lower cost, and better maintainability by simplifying the device construction while reducing the number of required pumps with switching means provided for switching a cold and hot water serving pump between a cold water pump functioning state and a hot water pump functioning state.SOLUTION: The cold and hot water supply system includes a plurality of cold and hot water serving outgoing headers 31A, 31B, 31C having different numbers of cold and hot water serving pumps 30A, 30B, 30C connected thereto. Switching means 37A, 37B, 37C switch the state of connecting a cold water generation part 40 and a hot water generation part 50 to the plurality of respective cold and hot water serving outgoing headers 31A, 31B, 31C to switch the cold and hot water serving pump 30A, 30B, 30C between a cold water pump functioning state and a hot water pump functioning state for each of the cold and hot water serving outgoing headers 31A, 31B, 31C.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cold / hot water supply system that supplies cold water and hot water generated in a cold water generating section and a hot water generating section to a cold water utilization section and a hot water utilization section. [Background technology]

[0002] Patent Document 1 describes a known cold and hot water supply system that supplies cold water and hot water generated in a cold water generating unit and a hot water generating unit to a cold water utilization unit and a hot water utilization unit through a cold water supply pipe and a hot water supply pipe. The chilled and hot water supply system described in Patent Document 1 includes a plurality of dual-purpose chilled and hot water pumps (11, 12, 13) and switching means (16-27) for switching the state of each of the plurality of dual-purpose chilled and hot water pumps (11, 12, 13) between a chilled water pump function state in which the pumps are connected to a chilled water supply pipe (37) and function as chilled water pumps, and a hot water pump function state in which the pumps are connected to a hot water supply pipe (38) and function as hot water pumps. The provision of such dual-purpose chilled and hot water pumps can reduce the number of pumps required to change the maximum supplyable flow rates of chilled water and hot water in the chilled water supply pipe and the hot water supply pipe in accordance with changes in the seasons, etc., thereby achieving space savings, cost reductions, improved maintainability, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 53-032943 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the cold and hot water supply system described in Patent Document 1, all (three) pumps are dual-purpose cold and hot water pumps, and furthermore, many switching means (switching valves) are provided for individually switching the state of each dual-purpose cold and hot water pump. Therefore, there are problems in that the piping structure for each pump becomes complicated, and the operation control of the switching means provided corresponding to each pump becomes complicated. In view of this situation, the main object of the present invention is to provide a technology in a cold / hot water supply system that supplies cold water and hot water generated in a cold water generating unit and a hot water generating unit to a cold water utilization unit and a hot water utilization unit, which reduces the number of pumps required by providing a switching means that can switch the state of a cold / hot water dual-purpose pump between a cold water pump function state and a hot water pump function state, while simplifying the device configuration to achieve further space savings, cost reductions, and improved maintainability. [Means for solving the problem]

[0005] A first characteristic configuration of the present invention is a cold / hot water supply system including a cold water supply pipe that supplies cold water generated by a cold water generating unit using the water supply power of a cold water pump to a cold water utilization unit, a hot water supply pipe that supplies hot water generated by a hot water generating unit using the water supply power of a hot water pump to a hot water utilization unit, and a plurality of cold / hot water pumps, and a switching means that can switch the state of each of the plurality of cold / hot water pumps between a cold water pump function state in which the pumps are connected to the cold water supply pipe and function as the cold water pump, and a hot water pump function state in which the pumps are connected to the hot water supply pipe and function as the hot water pump, A plurality of cold and hot water dual-purpose feed headers each having a different number of connected cold and hot water pumps are provided, The switching means is a means for switching the connection state of the cold water generating unit and the hot water generating unit for each of the multiple cold and hot water supply headers, thereby switching the state of the cold and hot water pump for each of the multiple cold and hot water supply headers between the cold water pump function state and the hot water pump function state.

[0006] According to this configuration, since a plurality of dual-purpose chilled and hot water supply headers are provided with different numbers of dual-purpose chilled and hot water pumps connected thereto, the switching means can switch the state of the dual-purpose chilled and hot water pumps collectively for each dual-purpose chilled and hot water supply header between the chilled water pump function state and the hot water pump function state by switching the connection state of the chilled water production unit and the hot water production unit for each of the plurality of dual-purpose chilled and hot water supply headers. This makes it possible to appropriately change the maximum supplyable flow rates of chilled water and hot water in each of the chilled water supply pipes and the hot water supply pipes in accordance with changes in the seasons, etc., while reducing the number of switching means compared to the number of installed dual-purpose chilled and hot water pumps, thereby simplifying the device configuration. Therefore, the present invention provides a technology that, in a cold / hot water supply system that supplies cold water and hot water generated in a cold water generating unit and a hot water generating unit to a cold water utilization unit and a hot water utilization unit, can reduce the number of pumps required by providing a switching means that can switch the state of the cold / hot water dual-purpose pump between a cold water pump function state and a hot water pump function state, while simplifying the device configuration to achieve further space savings, cost reductions, and improved maintainability.

[0007] The second characteristic configuration of the present invention is that it is equipped with a number setting means for setting the number of dual-purpose cold and hot water pumps that are in the cold water pump function state and the number of dual-purpose cold and hot water pumps that are in the hot water pump function state, depending on the thermal load in the cold water usage section and the hot water usage section.

[0008] According to this configuration, when the switching means switches the state of the dual-purpose pumps for each dual-purpose feed header between the cold water pump function state and the hot water pump function state, the number setting means automatically sets the number of dual-purpose pumps that will be in the cold water pump function state and the number of dual-purpose pumps that will be in the hot water pump function state in accordance with the thermal loads in the cold water utilization section and the hot water utilization section, thereby making it possible to appropriately and reliably change the maximum supply flow rates of cold water and hot water in the cold water supply pipes and the hot water supply pipes, respectively, in accordance with changes in the seasons, etc. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a chilled / hot water supply system according to an embodiment of the present invention and an operating state in a summer operation mode. [Figure 2] FIG. 1 is a diagram showing a schematic configuration of a chilled / hot water supply system according to an embodiment of the present invention and an operating state in a winter operation mode. [Figure 3] FIG. 1 is a diagram showing a schematic configuration of a chilled / hot water supply system according to an embodiment of the present invention and an operating state in an intermediate season operation mode. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a hot and cold water supply system according to the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. As shown in Figures 1, 2, and 3, the cold and hot water supply system of this embodiment (hereinafter referred to as "this system") is configured as a system that supplies cold water CW and hot water HW generated in a cold water generating unit 40 and a hot water generating unit 50, such as a chiller or a heat pump, to a cold water utilizing unit 43 and a hot water utilizing unit 53, such as an air conditioning system. In Figures 1, 2, and 3, open valves are shown in white, closed valves are shown in black, pipelines through which water is flowing and pumps that are operating are shown in solid lines, and pipelines through which water is not flowing and pumps that are stopped are shown in dashed lines.

[0011] This system is provided with a cold water supply pipe 41 that supplies cold water CW generated by the cold water generating unit 40 to the cold water utilization unit 43 using the water supply power of the cold water pump CP, and a hot water supply pipe 51 that supplies hot water HW generated by the hot water generating unit 50 to the hot water utilization unit 53 using the water supply power of the hot water pump HP. That is, when the cold water pump CP is operated, the cold water CW generated by the cold water generating unit 40 flows out from the cold water outlet port 40a, passes through the operating cold water pump CP and the cold water supply pipe 41, and is supplied to the cold water utilization unit 43. Then, the cold water CW, whose cold energy has been consumed in the cold water utilization unit 43, passes through the cold water return pipe 45 and is returned to the cold water generating unit 40 from the cold water inlet port 40b.

[0012] On the other hand, when the hot water pump HP is operated, the hot water HW generated in the hot water generating unit 50 flows out from the hot water outflow portion 50a, passes through the operating hot water pump HP and the hot water supply pipe 51, and is supplied to the hot water utilization unit 53. Then, the hot water HW whose hot heat has been consumed in the hot water utilization unit 53 passes through the hot water return pipe 55 and is returned to the hot water generating unit 50 from the hot water inflow portion 50b. The cold water return pipeline 45 is provided with a cold water primary return header 46 and a cold water secondary return header 47 as appropriate, and the hot water return pipeline 55 is provided with a hot water primary return header 56 and a hot water secondary return header 57 as appropriate.

[0013] Note that Figures 1, 2, and 3 illustrate a state in which cold water CW and hot water HW generated in one cold water generation unit 40 and one hot water generation unit 50 are supplied to two cold water utilization units 43 and two hot water utilization units 53, but the number of cold water utilization units 43 and hot water utilization units 53, and the number of cold water generation units 40 and hot water generation units 50 can be changed as appropriate.

[0014] This system has a total of six dual-purpose cold and hot water pumps 30A, 30B, and 30C arranged in parallel: three first dual-purpose cold and hot water pumps 30A, two second dual-purpose cold and hot water pumps 30B, and one third dual-purpose cold and hot water pump 30C. As will be described in detail later, the three first combined chilled and hot water pumps 30A are installed in parallel between the first combined chilled and hot water primary forward header 31A and the first combined chilled and hot water secondary forward header 32A. The two second combined chilled and hot water pumps 30B are installed in parallel between the second combined chilled and hot water primary forward header 31B and the second combined chilled and hot water secondary forward header 32B. The one third combined chilled and hot water pump 30C is installed between the third combined chilled and hot water primary forward header 31C and the third combined chilled and hot water secondary forward header 32C.

[0015] Switching devices 37A, 37B, and 37C are provided for the multiple dual-purpose cold and hot water pumps 30A, 30B, and 30C, respectively. The switching devices 37A, 37B, and 37C are configured to switch the state of each of the multiple dual-purpose cold and hot water pumps 30A, 30B, and 30C between a cold water pump function state in which the pump is connected to the cold water supply pipe 41 and functions as a cold water pump CP, and a hot water pump function state in which the pump is connected to the hot water supply pipe 51 and functions as a hot water pump HP. The provision of these dual-purpose cold and hot water pumps 30A, 30B, and 30C and switching devices 37A, 37B, and 37C allows the number of pumps required to be reduced, thereby achieving space savings, cost reductions, and improved maintainability, even when the maximum supplyable flow rates of the cold water CW and the hot water HW in the cold water supply pipe 41 and the hot water supply pipe 51, respectively, change depending on the season or other changes.

[0016] This system is provided with a plurality of chilled and hot water forward headers to which chilled and hot water pumps 30A, 30B, and 30C are connected, including first chilled and hot water forward headers 31A and 32A to which three first chilled and hot water pumps 30A are connected, second chilled and hot water forward headers 31B and 32B to which two second chilled and hot water pumps 30B are connected, and third chilled and hot water forward headers 31C and 32C to which one third chilled and hot water pump 30C is connected. That is, the first chilled and hot water forward headers 31A and 32A, the second chilled and hot water forward headers 31B and 32B, and the third chilled and hot water forward headers 31C and 32C are configured to have different numbers of chilled and hot water pumps 30A, 30B, and 30C connected to them.

[0017] The first combined chilled and hot water forward headers 31A, 32A, the second combined chilled and hot water forward headers 31B, 32B, and the third combined chilled and hot water forward headers 31C, 32C consist of combined chilled and hot water primary forward headers 31A, 31B, 31C located upstream of the combined chilled and hot water pumps 30A, 30B, 30C, and combined chilled and hot water secondary forward headers 32A, 32B, 32C located downstream of the combined chilled and hot water pumps 30A, 30B, 30C. In other words, three first combined chilled and hot water pumps 30A are interposed in parallel between the first combined chilled and hot water primary forward header 31A and the first combined chilled and hot water secondary forward header 32A. Two second dual-purpose chilled and hot water pumps 30B are installed in parallel between the second dual-purpose chilled and hot water primary outgoing header 31B and the second dual-purpose chilled and hot water secondary outgoing header 32B. One third dual-purpose chilled and hot water pump 30C is installed between the third dual-purpose chilled and hot water primary outgoing header 31C and the third dual-purpose chilled and hot water secondary outgoing header 32C.

[0018] The first switching means 37A is configured as a means for collectively switching the states of the three chilled and hot water dual-purpose pumps 30A connected to the first chilled and hot water dual-purpose feed headers 31A, 32A between a chilled water pump function state and a hot water pump function state by switching the connection state of the chilled water production unit 40 and the hot water production unit 50 to the first chilled and hot water dual-purpose feed headers 31A, 32A. The second switching means 37B is configured as a means for collectively switching the states of the two chilled and hot water dual-purpose pumps 30B connected to the second chilled and hot water dual-purpose feed headers 31B, 32B between a chilled water pump function state and a hot water pump function state by switching the connection state of the chilled water production unit 40 and the hot water production unit 50 to the second chilled and hot water dual-purpose feed headers 31B, 32B. The third switching means 37C is configured as a means for switching the state of one cold / hot water dual-purpose pump 30C connected to the third cold / hot water dual-purpose feed header 31C, 32C between a cold water pump function state and a hot water pump function state by switching the connection state of the cold water generating unit 40 and the hot water generating unit 50 to the third cold / hot water dual-purpose feed header 31C, 32C.

[0019] Specifically, the three first chilled / hot water pumps 30A are provided with a first chilled water side on / off control valve 34A that can connect and disconnect a first chilled / hot water primary feed header 31A located upstream of the three first chilled / hot water pumps 30A to the chilled water outlet 40a of the chilled water production section 40, and a first hot water side on / off control valve 35A that can connect and disconnect a first chilled / hot water primary feed header 31A located upstream of the three first chilled / hot water pumps 30A to the hot water outlet 50a of the hot water production section 50. The first chilled water side on / off control valve 34A and the first hot water side on / off control valve 35A function as a first switching means 37A that collectively switches the state of the three first chilled / hot water pumps 30A between a chilled water pump function state and a hot water pump function state.

[0020] The two second chilled and hot water pumps 30B are provided with a second chilled water side on / off control valve 34B that can connect and disconnect a second chilled and hot water primary feed header 31B located upstream of the two second chilled and hot water pumps 30B to the chilled water outlet 40a of the chilled water production section 40, and a second hot water side on / off control valve 35B that can connect and disconnect a second chilled and hot water primary feed header 31B located upstream of the two second chilled and hot water pumps 30B to the hot water outlet 50a of the hot water production section 50. The second chilled water side on / off control valve 34B and the second hot water side on / off control valve 35B function as a second switching means 37B that collectively switches the states of the two second chilled and hot water pumps 30B between a chilled water pump function state and a hot water pump function state.

[0021] Each third dual-purpose chilled / hot water pump 30C is provided with a third chilled water on / off control valve 34C that can connect and disconnect a third dual-purpose chilled / hot water primary feed header 31C located upstream of the third dual-purpose chilled / hot water pump 30C to the chilled water outlet 40a of the chilled water production section 40, and a third hot water on / off control valve 35C that can connect and disconnect a third dual-purpose chilled / hot water primary feed header 31C located upstream of the third dual-purpose chilled / hot water pump 30C to the hot water outlet 50a of the hot water production section 50. The third chilled water on / off control valve 34C and the third hot water on / off control valve 35C function as a third switching means 37C that switches the state of the third dual-purpose chilled / hot water pump 30C between a chilled water pump function state and a hot water pump function state.

[0022] Referring to the state of the first switching means 37A, as shown in Figure 1, by opening the first cold water side opening / closing control valve 34A and closing the first hot water side opening / closing control valve 35A, and connecting three first cold and hot water dual-purpose pumps 30A to the cold water outlet section 40a of the cold water generating section 40 via the first cold and hot water dual-purpose primary feed header 31A and the first cold water side opening / closing control valve 34A, the three first cold and hot water dual-purpose pumps 30A collectively function as a cold water pump CP. 2 and 3, by connecting three first chilled / hot water dual-purpose pumps 30A to the hot water outlet portion 50a of the hot water generating section 50 via the first chilled / hot water dual-purpose primary feed header 31A and the first hot water side on / off control valve 35A with the first chilled water side on / off control valve 34A closed and the first hot water side on / off control valve 35A open, the three first chilled / hot water dual-purpose pumps 30A collectively function as hot water pumps HP. Note that the second switching means 37B and the third switching means 37C can also be configured in the same manner as the above-mentioned first switching means 37A to cause each of the two second chilled / hot water dual-purpose pumps 30B and one third chilled / hot water dual-purpose pump 30C to function as a chilled water pump CP or a hot water pump HP.

[0023] With this configuration, the maximum supplyable flow rates of the cold water CW and the hot water HW in each of the cold water supply pipe 41 and the hot water supply pipe 51 can be changed as needed in accordance with changes in the season, etc. Furthermore, since the state can be switched collectively for each of the multiple cold and hot water pumps 30A, 30B, 30C by the switching devices 37A, 37B, 37C, the number of switching devices 37A, 37B, 37C can be reduced compared to the number of installed cold and hot water pumps 30A, 30B, 30C, thereby simplifying the device configuration.

[0024] This system is provided with a control device 60 for controlling the operation of various devices. The control device 60 acquires the thermal loads of the cold water utilization section 43 and the hot water utilization section 53 in a manner that acquires the cooling load of the cold water utilization section 43 from the flow rate of the cold water CW in the cold water utilization section 43 and the temperature difference between the inlet and outlet, etc., and acquires the heating load of the hot water utilization section 53 from the flow rate of the hot water HW in the hot water utilization section 53 and the temperature difference between the inlet and outlet, etc., and controls the operation of switching means 37A, 37B, 37C, etc. according to the acquired thermal loads of the cold water utilization section 43 and the hot water utilization section 53 to switch the operation mode among a summer operation mode (see FIG. 1), a winter operation mode (see FIG. 2), and an intermediate season operation mode (see FIG. 3), which will be described later.

[0025] Furthermore, the control device 60 executes a predetermined computer program to function as a number setting means 61 that automatically sets the number of dual-purpose chilled and hot water pumps 30A, 30B, 30C that are to be in a chilled water pump function state functioning as the above-mentioned chilled water pump CP and the number of dual-purpose chilled and hot water pumps 30A, 30B, 30C that are to be in a hot water pump function state functioning as the above-mentioned hot water pump HP, in accordance with the thermal loads in the chilled water utilization section 43 and the hot water utilization section 53. That is, the number setting means 61 sets the number of dual-purpose chilled and hot water pumps 30A, 30B, 30C that are to be in a chilled water pump function state and the number of dual-purpose chilled and hot water pumps 30A, 30B, 30C that are to be in a hot water pump function state for each of the summer operation mode (see FIG. 1), the winter operation mode (see FIG. 2), and the intermediate season operation mode (see FIG. 3). This allows the maximum supplyable flow rates of the cold water CW and the hot water HW in the cold water supply pipe 41 and the hot water supply pipe 51, respectively, to be appropriately and reliably changed in accordance with changes in the seasons and the like. The summer operation mode, winter operation mode, and intermediate season operation mode will be described in detail below.

[0026] (Summer operation mode) In summer, when the cold heat load of the cold water utilization section 43 is in a high cold heat load range that is larger than in winter, and the hot heat load of the hot water utilization section 53 is in a low heat load range that is smaller than in winter, the control device 60 sets the operation mode to the summer operation mode as shown in Figure 1. In this summer operation mode, the three first cold / hot water dual-purpose pumps 30A are set to a cold water pump function state in which they function as cold water pumps CP by the first switching means 37A, the two second cold / hot water dual-purpose pumps 30B are set to a cold water pump function state in which they function as cold water pumps CP by the second switching means 37B, and the one third cold / hot water dual-purpose pump 30C is set to a hot water pump function state in which it functions as a hot water pump HP by the third switching means 37C.

[0027] That is, in the summer operation mode, a total of five dual-purpose chilled and hot water pumps 30A, 30B, which is more than in the winter operation mode described below, function as chilled water pumps CP, and the maximum supplyable flow rate of chilled water CW from the chilled water supply pipe 41 to the chilled water utilization section 43 is set to be larger than in the winter operation mode described below, and these more chilled water pumps CP can appropriately respond to a relatively large chilling load that falls into a high chilling load range in the chilled water utilization section 43. Furthermore, in the summer operation mode, a total of one dual-purpose chilled and hot water pump 30C, which is less than in the winter operation mode described below, functions as a hot water pump HP, and the maximum supplyable flow rate of hot water HW from the hot water supply pipe 51 to the hot water utilization section 53 is set to be smaller than in the winter operation mode described below, and these fewer hot water pumps HP can appropriately respond to a relatively small hot load that falls into a low temperature load range in the hot water utilization section 53. In the summer operation mode, the control device 60 controls the number of operating cold water pumps, controlling the number of operating cold water pumps CP based on the cooling load of the cold water utilization unit 43, while controlling the number of operating hot water pumps, controlling the number of operating hot water pumps HP based on the heating load of the hot water utilization unit 53, for the above-mentioned one hot water pump HP.

[0028] (Winter driving mode) In winter, when the cold water utilization section 43 has a low cold load range that is smaller than that in summer, and the hot water utilization section 53 has a high heat load range that is larger than that in summer, the control device 60 sets the operation mode to the winter operation mode as shown in Figure 2. In this winter operation mode, the three first cold / hot water dual-purpose pumps 30A are set to a hot water pump function state in which they function as hot water pumps HP by the first switching means 37A, the two second cold / hot water dual-purpose pumps 30B are set to a cold water pump function state in which they function as cold water pumps CP by the second switching means 37B, and the one third cold / hot water dual-purpose pump 30C is set to a hot water pump function state in which they function as hot water pump HP by the third switching means 37C.

[0029] That is, in the winter operation mode, a total of two dual-purpose chilled and hot water pumps 30B, which is fewer than in the summer operation mode described above, function as chilled water pumps CP, and the maximum supplyable flow rate of chilled water CW from the chilled water supply pipe 41 to the chilled water utilization section 43 is set to be smaller than in the summer operation mode described above, and these fewer chilled water pumps CP can appropriately respond to a relatively small chilling load that falls in the low chilling load range in the chilled water utilization section 43. Furthermore, in the winter operation mode, a total of four dual-purpose chilled and hot water pumps 30A, 30C, which is more than in the summer operation mode described above, function as hot water pumps HP, and the maximum supplyable flow rate of hot water HW from the hot water supply pipe 51 to the hot water utilization section 53 is set to be larger than in the summer operation mode described above, and these more hot water pumps HP can appropriately respond to a relatively large hot load that falls in the high temperature load range in the hot water utilization section 53. In the winter operation mode, the control device 60 controls the number of operating cold water pumps, controlling the number of operating cold water pumps CP based on the cooling load of the cold water utilization unit 43, while controlling the number of operating hot water pumps, controlling the number of operating hot water pumps HP based on the heating load of the hot water utilization unit 53, for the above-mentioned four hot water pumps HP.

[0030] (Intermediate season operation mode) In the intermediate season when the cold heat load of the cold water utilization section 43 is in a medium cold heat load range that is smaller than in summer and slightly larger than in winter, and the warm water utilization section 53 is in a medium heat load range that is larger than in summer and smaller than in winter, the control device 60 sets the operation mode to the intermediate season operation mode as shown in Figure 3. In this intermediate operation mode, the three first dual-purpose chilled and hot water pumps 30A are set to a hot water pump function state in which they function as hot water pumps HP by the first switching means 37A, and the two second dual-purpose chilled and hot water pumps 30B are set to a cold water pump function state in which they function as cold water pumps CP by the second switching means 37B. Furthermore, the one third dual-purpose chilled and hot water pump 30C is set to a state in which its operation is stopped with the third chilled water side opening / closing control valve 34C and the third hot water side opening / closing control valve 35C closed.

[0031] That is, in the intermediate season operation mode, the same two dual-purpose chilled and hot water pumps 30B as in the winter operation mode described above function as chilled water pumps CP, and the maximum supplyable flow rate of chilled water CW from the chilled water supply pipe 41 to the chilled water utilization section 43 is set to the same as in the winter operation mode described above, and these chilled water pumps CP can appropriately respond to a moderate chilling heat load that falls within the medium chilling heat load range in the chilled water utilization section 43. Furthermore, in the intermediate season operation mode, a total of three dual-purpose chilled and hot water pumps 30A, which is more than in the summer operation mode described above but less than in the winter operation mode described above, function as hot water pumps HP, and the maximum supplyable flow rate of hot water HW from the hot water supply pipe 51 to the hot water utilization section 53 is set to be greater than in the summer operation mode but less than in the winter operation mode described above, and these hot water pumps HP can appropriately respond to a moderate hot heat load that falls within the medium temperature heat load range in the hot water utilization section 53. In the intermediate season operation mode, the control device 60 executes control of the number of operating cold water pumps, controlling the number of operating cold water pumps CP based on the cooling load of the cold water utilization section 43, while executing control of the number of operating hot water pumps, controlling the number of operating hot water pumps HP based on the heating load of the hot water utilization section 53, for the above-mentioned total of three hot water pumps HP.

[0032] [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.

[0033] (1) In the above embodiment, a first cold / hot water dual-purpose feed header 31A, 32A to which three first cold / hot water dual-purpose pumps 30A are connected, a second cold / hot water dual-purpose feed header 31B, 32B to which two second cold / hot water dual-purpose pumps 30B are connected, and a third cold / hot water dual-purpose feed header 31C, 32C to which one third cold / hot water dual-purpose pump 30C is connected are provided, but the number of these cold / hot water dual-purpose feed headers and the number of cold / hot water dual-purpose pumps connected to each cold / hot water dual-purpose feed header can be changed as appropriate.

[0034] (2) In the above embodiment, the number setting means 61 is configured to automatically set the number of dual-purpose cold and hot water pumps 30A, 30B, 30C that are in a cold water pump function state and the number of dual-purpose cold and hot water pumps 30A, 30B, 30C that are in a hot water pump function state in accordance with the thermal load in the cold water utilization section 43 and the hot water utilization section 53 acquired by the control device 60. However, these numbers may also be configured to be set at any time without being based on the thermal load acquired by the control device 60.

[0035] (3) In the above embodiment, all of the pumps are dual-purpose cold and hot water pumps 30A, 30B, and 30C, which require switching devices 37A, 37B, and 37C, but a dedicated cold water pump that functions only as a cold water pump CP and a dedicated hot water pump that functions only as a hot water pump HP may also be provided. By providing a dedicated cold water pump and a dedicated hot water pump, only some of the pumps become dual-purpose cold and hot water pumps that require switching devices, and the number of switching devices can be reduced compared to when all pumps are dual-purpose cold and hot water pumps that require switching devices, thereby simplifying the device configuration. [Explanation of symbols]

[0036] 30A No. 1 cold and hot water pump (cold and hot water pump) 30B No. 2 cold and hot water pump (hot and cold water pump) 30C No. 3 dual-purpose cold and hot water pump (dual-purpose cold and hot water pump) 31 Primary header for both hot and cold water (header for both hot and cold water) 32 Dual-use cold and hot water secondary feed header (Dual-use cold and hot water feed header) 31A 1st cold and hot water dual-purpose primary outgoing header (1st cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 32A 1st cold and hot water dual-purpose secondary outgoing header (1st cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 31B Second cold and hot water dual-purpose primary outgoing header (Second cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 32B Secondary cold and hot water dual-purpose secondary outgoing header (Secondary cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 31C 3rd cold and hot water dual-purpose primary outgoing header (3rd cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 32C 3rd cold and hot water dual-purpose secondary outgoing header (3rd cold and hot water dual-purpose outgoing header, cold and hot water dual-purpose outgoing header) 37A First switching means (switching means) 37B Second switching means (switching means) 37C Third switching means (switching means) 40 Cold water generation section 41 Cold water supply pipeline 43 Cold water usage section 50 Hot water generation section 51 Hot water supply pipeline 53 Hot Water Utilization Department 61 Number setting method CP Chilled Water Pump CW Cold Water HP Hot Water Pump HW hot water

Claims

1. A cold / hot water supply system comprising: a cold water supply pipe that supplies cold water generated by a cold water generating unit using the water supply power of a cold water pump to a cold water utilization unit; a hot water supply pipe that supplies hot water generated by a hot water generating unit using the water supply power of a hot water pump to a hot water utilization unit; and a plurality of cold / hot water pumps, the system comprising: a switching means that switches the state of each of the plurality of cold / hot water pumps between a cold water pump function state in which the pumps are connected to the cold water supply pipe and function as the cold water pumps, and a hot water pump function state in which the pumps are connected to the hot water supply pipe and function as the hot water pumps, A plurality of cold and hot water dual-purpose feed headers each having a different number of connected cold and hot water pumps are provided, A cold and hot water supply system in which the switching means switches the connection state of the cold water generating unit and the hot water generating unit for each of the multiple cold and hot water supply headers, thereby switching the state of the cold and hot water pump for each of the multiple cold and hot water supply headers between the cold water pump function state and the hot water pump function state.

2. The cold and hot water supply system of claim 1, further comprising a number setting means for setting the number of the cold and hot water dual-purpose pumps that are set to the cold water pump function state and the number of the cold and hot water dual-purpose pumps that are set to the hot water pump function state according to the thermal load in the cold water utilization section and the hot water utilization section.

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