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 pump 10 exclusive for cold water, only functioning as a cold water pump CP, and a pump 20 exclusive for hot water, only functioning as a hot water pump HP, apart from a cold and hot water serving pump 30.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, In addition to the hot and cold water pump, a dedicated cold water pump that functions only as the hot water pump and a dedicated hot water pump that functions only as the hot water pump are provided.

[0006] According to this configuration, the system is provided with a dedicated cold water pump and a dedicated hot water pump, and only a portion of the pumps are dual-purpose cold and hot water pumps that require the switching means. This reduces the number of switching means compared to when all pumps are dual-purpose cold and hot water pumps that require the switching means, thereby simplifying the system 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] A second characteristic configuration of the present invention is that the water supply capacity of the dedicated chilled water pump is set to correspond to a minimum cooling load in the chilled water utilization section, The water supply capacity of the dedicated hot water pump is set to correspond to the minimum heat load in the hot water utilization section.

[0008] According to this configuration, the water delivery capacity of the dedicated chilled water pump is set to correspond to the minimum cooling load in the chilled water utilization section. For example, in winter, when the cooling load in the chilled water utilization section is minimum, chilled water can be supplied to the chilled water utilization section using only the dedicated chilled water pump without waste. In summer, when the cooling load in the chilled water utilization section increases, the dedicated chilled water pump and the dual-purpose chilled / hot water pump functioning as a chilled water pump can be added to supply chilled water to the chilled water utilization section. This avoids the need to install a dual-purpose chilled / hot water pump that needs to be switched to a chilled water pump functioning state in winter because its water delivery capacity is smaller than the minimum cooling load in the chilled water utilization section. Furthermore, it avoids the need to install a dedicated chilled water pump that is frequently shut down in winter because its water delivery capacity is greater than the minimum cooling load in the chilled water utilization section.

[0009] On the other hand, since the water supply capacity of the hot water pump is set to correspond to the minimum thermal load in the hot water utilization section, for example, in the summer when the thermal load in the hot water utilization section is minimum, hot water can be supplied to the hot water utilization section using only the hot water pump without waste, while in the winter when the thermal load in the hot water utilization section increases, hot water can be supplied to the hot water utilization section by adding the hot water pump functioning as a hot water pump to the hot water pump. This makes it possible to avoid the installation of a dual-purpose hot water pump that needs to be switched to hot water pump function in the summer because its water supply capacity is smaller than the minimum thermal load in the hot water utilization section. Also, it makes it possible to avoid the installation of a hot water pump that is frequently shut down in the summer because its water supply capacity is greater than the minimum thermal load in the hot water utilization section, resulting in unnecessary installation. Therefore, by optimizing the number of dual-purpose cold water pumps and the number of dedicated cold water pumps and dedicated hot water pumps, it is possible to reduce the overall number of pumps installed while preventing the equipment configuration from becoming more complicated due to an increase in the number of dual-purpose cold and hot water pumps installed. [Brief explanation of the drawings]

[0010] [Figure 1] 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

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In this system, a total of six pumps 30, 10, 20 are provided in parallel: three dual-purpose chilled and hot water pumps 30, two dedicated chilled water pumps 10, and one dedicated hot water pump 20. As will be described in detail later, the three dual-purpose chilled and hot water pumps 30 are installed in parallel between a dual-purpose chilled and hot water primary feed header 31 and a dual-purpose chilled and hot water secondary feed header 32. The two dedicated chilled water pumps 10 are installed in parallel between a dedicated chilled water primary feed header 11 and a dedicated chilled water secondary feed header 12. The one dedicated hot water pump 20 is installed between a dedicated hot water primary feed header 21 and a dedicated hot water secondary feed header 22.

[0016] A switching means 37 is provided for the multiple cold and hot water pumps 30. The switching means 37 is configured to switch the state of each of the multiple cold and hot water pumps 30 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. By providing such a cold and hot water pump 30 and the switching means 37, even if 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, the number of pumps required can be reduced, thereby realizing space savings, cost reductions, improved maintainability, and the like.

[0017] This system is provided with dual-purpose cold and hot water supply headers 31, 32 connected to a dual-purpose cold and hot water pump 30, cold water-only supply headers 11, 12 connected to a cold water-only pump 10, and hot water-only supply headers 21, 22 connected to a hot water-only pump 20.

[0018] Furthermore, the dual-purpose cold and hot water forward headers 31, 32, the dedicated cold water forward headers 11, 12, and the dedicated hot water forward headers 21, 22 are composed of primary forward headers 31, 11, 21 located upstream of the pumps 30, 10, 20, and secondary forward headers 32, 12, 22 located downstream of the pumps 30, 10, 20. That is, three dual-purpose cold and hot water pumps 30 are installed in parallel between the dual-purpose cold and hot water primary forward header 31 and the dual-purpose cold and hot water secondary forward header 32. Two dedicated cold water pumps 10 are installed in parallel between the dedicated cold water primary forward header 11 and the dedicated cold water secondary forward header 12. One dedicated hot water pump 20 is installed between the dedicated hot water primary forward header 21 and the dedicated hot water secondary forward header 22.

[0019] The switching means 37 is configured as a means for switching the connection state of the cold water generating unit 40 and the hot water generating unit 50 to the cold and hot water dual-purpose feed headers 31, 32, thereby switching the state of the three cold and hot water dual-purpose pumps 30 connected to the cold and hot water dual-purpose feed headers 31, 32 collectively between a cold water pump function state and a hot water pump function state.

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

[0021] 1, by connecting three dual-purpose cold and hot water pumps 30 to the cold water outlet 40a of the cold water generating section 40 via the dual-purpose cold and hot water primary feed header 31 and the cold water side on / off control valve 34 with the cold water side on / off control valve 34 open and the hot water side on / off control valve 35 closed, the three dual-purpose cold and hot water pumps 30 collectively function as cold water pumps CP. On the other hand, by connecting three dual-purpose cold and hot water pumps 30 to the hot water outlet 50a of the hot water generating section 50 via the dual-purpose cold and hot water primary feed header 31 and the hot water side on / off control valve 35 with the cold water side on / off control valve 34 closed and the hot water side on / off control valve 35 open, the three dual-purpose cold and hot water pumps 30 collectively function as hot water pumps HP.

[0022] With this configuration, 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, can be changed as needed in response to changes in the season, etc. Furthermore, since the state can be switched collectively for each of a plurality of dual-purpose cold and hot water pumps 30 by the switching means 37, the number of switching means 37 can be reduced compared to the number of installed dual-purpose cold and hot water pumps 30, thereby simplifying the device configuration.

[0023] The two chilled water pumps 10 are provided with chilled water side on / off control valves 14 that can connect and disconnect a chilled water primary feed header 11 located upstream of the two chilled water pumps 10 to the chilled water outlet 40a of the chilled water generating unit 40. By opening the chilled water side on / off control valves 14 and connecting the two chilled water pumps 10 to the chilled water outlet 40a of the chilled water generating unit 40 via the chilled water primary feed header 11 and the chilled water side on / off control valves 14, the two chilled water pumps 10 function only as chilled water pumps CP. Each hot water pump 20 is provided with a hot water side on / off control valve 25 that can interrupt the connection between a hot water primary feed header 21 located upstream of the hot water pump 20 and the hot water outlet 50a of the hot water generating unit 50. By opening the hot water side on / off control valve 25 and connecting the hot water pump 20 to the hot water outlet 50a of the hot water generating unit 50 via the hot water primary feed header 21 and the hot water side on / off control valve 25, the hot water pump 20 functions only as a hot water pump HP. In this way, by providing a dedicated cold water pump 10 and a dedicated hot water pump 20, and only a portion of all the pumps being dual-purpose cold and hot water pumps 30 that require switching means 37, the number of switching means 37 is reduced compared to when all the pumps are dual-purpose cold and hot water pumps 30 that require switching means 37, and the device configuration is simplified.

[0024] The water supply capacity of the dedicated chilled water pump 10 is set to correspond to the minimum chilled heat load in the chilled water utilization section 43. Specifically, the number of dedicated chilled water pumps 10 is set to two because two pumps can cover the required supply flow rate of chilled water CW to the chilled water utilization section 43 in winter when the chilled heat load in the chilled water utilization section 43 is minimum. As a result, as will be described in detail later, in winter (see FIG. 2), chilled water CW can be efficiently supplied to the chilled water utilization section 43 with only two dedicated chilled water pumps 10, while in summer (see FIG. 1), when the chilled heat load in the chilled water utilization section 43 increases, chilled water CW can be supplied to the chilled water utilization section 43 with a total of five chilled water pumps CP, including the two dedicated chilled water pumps 10 and the three dual-purpose chilled and hot water pumps 30 functioning as chilled water pumps CP. This avoids the installation of a dual-purpose cold and hot water pump 30 that needs to be switched to a cold water pump function state in winter because the water conveyance capacity of the cold water pump 10 is smaller than that corresponding to the minimum cold heat load in the cold water utilization section 43. Also, this avoids the installation of a wasteful cold water pump 10 that is frequently stopped in winter because the water conveyance capacity of the cold water pump 10 is larger than that corresponding to the minimum cold heat load in the cold water utilization section 43. In this embodiment, the water supply capacity of the chilled water pump 10 is set to correspond to the minimum cooling load in the chilled water utilization section 43, but the water supply capacity of the chilled water pump 10 may be changed as appropriate.

[0025] The water supply capacity of the dedicated hot water pump 20 is set to correspond to the minimum heat load in the hot water utilization section 53. Specifically, the number of dedicated hot water pumps 20 is set to one because one pump can cover the required supply flow rate of hot water HW to the hot water utilization section 53 in the summer when the heat load in the hot water utilization section 53 is minimum. As a result, as will be described in detail later, in the summer (see FIG. 1), hot water HW can be supplied to the hot water utilization section 53 without waste using only one dedicated hot water pump 20, while in the winter (see FIG. 2) when the heat load in the hot water utilization section 53 increases, hot water HW can be supplied to the hot water utilization section 53 using a total of four hot water pumps HP, including the one dedicated hot water pump 20 and three dual-purpose hot and cold water pumps 30 functioning as hot water pumps HP. This avoids the installation of a dual-purpose hot and cold water pump 30 that needs to be switched to a hot water pump function state in the summer because the water supply capacity of the hot water pump 20 is smaller than that corresponding to the minimum thermal load in the hot water utilization section 53. Also, this avoids the installation of a wasteful hot water pump 20 that is frequently stopped in the summer because the water supply capacity of the hot water pump 20 is larger than that corresponding to the minimum thermal load in the hot water utilization section 53. In this embodiment, the water supply capacity of the hot water pump 20 is set to correspond to the minimum thermal load in the hot water utilization section 53, but the water supply capacity of the hot water pump 20 may be changed as appropriate.

[0026] 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, 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, the temperature difference between the inlet and outlet, etc., and controls the operation of the switching means 37 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. The control device 60 sets the number of dual-purpose cold and hot water pumps 30 that are in the cold water pump function state and the number of dual-purpose cold and hot water pumps 30 that are in the hot water pump function state for each of the summer operation mode (see FIG. 1), winter operation mode (see FIG. 2), and 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, etc. The summer operation mode, winter operation mode, and intermediate season operation mode will be described in detail below.

[0027] (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 dual-purpose cold and hot water pumps 30 are set to a cold water pump function state in which they function as cold water pumps CP by the switching means 37. The two dedicated cold water pumps 10 function as cold water pumps CP, and the one dedicated hot water pump 20 functions as a hot water pump HP.

[0028] That is, in the summer operation mode, a total of five dual-purpose chilled and hot water pumps 30 and dedicated chilled water pumps 10, 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 the high chilling load range in the chilled water utilization section 43. Furthermore, in the summer operation mode, a total of one dedicated hot water pump 20, 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 heating load that falls into the low temperature heating 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.

[0029] (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 dual-purpose cold and hot water pumps 30 are set to a hot water pump function state in which they function as hot water pumps HP by the switching means 37. The two dedicated cold water pumps 10 function as cold water pumps CP, and the one dedicated hot water pump 20 functions as the hot water pump HP.

[0030] That is, in the winter operation mode, a total of two dedicated chilled water pumps 10, 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 within the low chilling load range in the chilled water utilization section 43. Furthermore, in the winter operation mode, a total of five dual-purpose chilled and hot water pumps 30 and dedicated hot water pumps 20, 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 within 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 total of five hot water pumps HP.

[0031] (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 season operation mode, the three dual-purpose cold and hot water pumps 30 are set to a hot water pump function state in which they function as hot water pumps HP by the switching means 37. Regardless of the operation mode, the two dedicated cold water pumps 10 function as chilled water pumps CP. Furthermore, one dedicated hot water pump 20 is stopped from operating by closing the hot water side opening / closing control valve 25.

[0032] That is, in the intermediate season operation mode, the same two dedicated chilled water pumps 10 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 load that falls within the medium chilling 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 30, 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 load that falls within the medium temperature 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.

[0033] [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.

[0034] (1) In the above embodiment, the number of the dual-purpose chilled and hot water outgoing headers 31, 32 to which the dual-purpose chilled and hot water pump 30 is connected is one. However, multiple dual-purpose chilled and hot water outgoing headers may be provided, and a switching device may be provided for each of the multiple dual-purpose chilled and hot water outgoing headers. When multiple dual-purpose chilled and hot water outgoing headers are provided, the number of dual-purpose chilled and hot water pumps connected to each dual-purpose chilled and hot water outgoing header may be set as appropriate. For example, the number of dual-purpose chilled and hot water pumps connected to each dual-purpose chilled and hot water outgoing header may be configured to be different from each other. When multiple dual-purpose chilled and hot water outgoing headers are provided, each dual-purpose chilled and hot water outgoing header may be provided with a switching device that switches between a chilled water pump function state and a hot water pump function state, thereby appropriately and reliably changing the maximum supplyable flow rates of the chilled water CW and the hot water in each of the chilled water supply pipe 41 and the hot water supply pipe 51 depending on changes in the season, etc.

[0035] (2) In the above embodiment, the number of dual-purpose cold and hot water pumps 30 was three, the number of dedicated cold water pumps 10 was two, and the number of dedicated hot water pumps 20 was one, but the numbers of dual-purpose cold and hot water pumps 30, dedicated cold water pumps 10, and dedicated hot water pumps 20 can be changed as appropriate depending on the thermal load conditions of each of the cold water utilization section 43 and the hot water utilization section 53. [Explanation of symbols]

[0036] 10. Chilled water pump 20 Hot water pump 30 Cold and hot water pump 37 Switching Method 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 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 dual-purpose pumps, the system comprising: a switching means that switches the state of each of the plurality of cold / hot water dual-purpose 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, The cold and hot water supply system further comprises, in addition to the cold and hot water pump, a cold water pump that functions only as the cold water pump, and a hot water pump that functions only as the hot water pump.

2. The water supply capacity of the dedicated chilled water pump is set to correspond to the minimum cooling load in the chilled water utilization section, 2. The hot and cold water supply system according to claim 1, wherein the water supply capacity of the dedicated hot water pump is set to correspond to a minimum heat load in the hot water utilization section.

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