Control apparatus, control method, and storage medium

Abstract

To provide a control device or the like of a heating medium system capable of easily reducing energy consumption cost.SOLUTION: A table creation unit that creates first and second tables in which respective energy consumption change amounts of the heat source machine and the heat transfer facility in a case where a set temperature of the heat source machine is increased / decreased by a predetermined value by changing the set temperature of the heat source machine by the predetermined value are recorded in association with each operating state; A heat source unit controller that controls the setting temperature of the heat source unit so as to reduce the energy cost of the heat medium system based on a first / second energy cost change amount of the heat medium system when the setting temperature of the heat source unit is increased / decreased by a predetermined value.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a control device, a control method, and a program. [Background technology]

[0002] In buildings such as office buildings, air conditioning such as heating or cooling is performed in target spaces such as rooms. For example, Patent Document 1 discloses a heat medium system in which a load-side device heats or cools the target space by driving heat transport equipment such as a pump, and the heat medium is supplied from a heat source device that imparts heat to the heat medium through a heat medium circulation circuit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-112557 Summary of the Invention [Problem to be solved by the invention]

[0004] In many heat transfer medium systems, due to PID control of the components (heat source equipment, heat transport equipment, load-side equipment, etc.), for example, an increase or decrease in the set temperature of the heat source equipment can have an inverse relationship with an increase or decrease in the heat transfer medium flow rate through the heat transport equipment. That is, in such heat transfer medium systems, an increase in the set temperature of the heat source equipment may decrease the heat transfer medium flow rate through the heat transport equipment, and conversely, a decrease in the set temperature of the heat source equipment may increase the heat transfer medium flow rate through the heat transport equipment. In such heat transfer medium systems, in order to reduce the energy consumption costs of the entire heat transfer medium system while maintaining the functionality of the load-side equipment, it is necessary to optimize the output balance between the heat source equipment and the heat transport equipment. However, because the behavior of the energy consumption of the heat source equipment and the heat transport equipment varies greatly depending on the system configuration, installation environment, operating conditions, etc., it has been difficult to control the heat transfer medium system to reduce the energy consumption costs of the entire heat transfer medium system.

[0005] Therefore, an object of the present invention is to provide a control device for a heat medium system that can easily reduce energy consumption costs. [Means for solving the problem]

[0006] A control device according to one aspect of the present invention is a control device for controlling a heat medium system including a heat source machine for adding heat to a heat medium, heat consuming equipment for exchanging heat between the heat medium and a load, and heat transport equipment for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming equipment, and the control device includes a table creation unit that creates a first table and a second table by changing the set temperature of the heat source machine by a predetermined value, and the first table includes a first heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine is increased by the predetermined value, and a second table including a second heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine is increased by the predetermined value. The first table records a first heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source equipment is increased by a predetermined value, and a second heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source equipment is decreased by a predetermined value, in association with each operating state of the heat transport equipment. an energy consumption change acquisition unit that acquires the first heat source machine energy consumption change amount and the second heat source machine energy consumption change amount associated with the current operating state of the heat source machine in the first table, and the first heat transport equipment energy consumption change amount and the second heat transport equipment energy consumption change amount associated with the current operating state of the heat transport equipment in the second table; an energy cost change calculation unit that calculates a first energy cost change amount, which is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source machine increases by a predetermined value, based on the acquired first heat source machine energy consumption change amount and first heat transport equipment energy consumption change amount, and calculates a second energy cost change amount, which is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source machine decreases by a predetermined value, based on the acquired second heat source machine energy consumption change amount and second heat transport equipment energy consumption change amount; and a heat source machine control unit that controls the set temperature of the heat source machine so as to reduce the energy cost of the heat medium system based on the first energy cost change amount and the second energy cost change amount.

[0007] According to this aspect, in a heat medium system including a heat source unit for adding heat to a heat medium, heat consuming equipment for exchanging heat between the heat medium and a load, and heat transport equipment for transporting the heat medium so that the heat medium circulates between the heat source unit and the heat consuming equipment, a first table is created in which the heat source unit energy consumption change amount when the heat source unit's temperature setting is increased / decreased by the predetermined value is recorded in association with the operating state of the heat source unit, and a second table is created in which the heat transport equipment energy consumption change amount when the heat source unit's temperature setting is increased / decreased by the predetermined value is recorded in association with the operating state of the heat transport equipment. Then, a first energy cost change amount and a second energy cost change amount, which represent the change in energy cost of the heat medium system when the heat source unit's temperature setting is increased / decreased by the predetermined value in the current operating state, are calculated from each energy consumption change amount. The set temperature of the heat source unit is controlled based on these energy cost changes to reduce the energy cost of the heat medium system. This makes it possible to easily reduce the energy consumption cost of the heat medium system. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a control device for a heat medium system that can easily reduce energy consumption costs. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a configuration of a hot and cold water system 1 according to an embodiment. [Figure 2] 1 is a schematic diagram illustrating an example of a functional configuration of a control device 100 according to an embodiment. [Figure 3] 3 is a schematic diagram showing an example of the data structure of a heat source machine operating state table 111. FIG. [Figure 4] 3 is a schematic diagram showing an example of the data structure of a pump operation status table 112. FIG. [Figure 5] 10 is a schematic diagram showing an example of the data structure of a heat source machine energy consumption change amount table 113. FIG. [Figure 6] 10 is a schematic diagram showing an example of the data structure of a pump energy consumption change amount table 114. FIG. [Figure 7] 4 is an operational flow diagram showing an example of operational processing relating to the creation of various tables by a table creation unit 130 of the control device 100 according to the embodiment. FIG. [Figure 8] 10 is an operational flow diagram showing an example of an operational process related to operation balance control by an operation balance control unit 140 of the control device 100 according to the embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] A preferred embodiment of the present invention will be described with reference to the accompanying drawings. (Note that in each drawing, components with the same reference numerals have the same or similar configurations.)

[0011] 1 is a diagram showing the configuration of a hot and cold water system 1 according to an embodiment. The configuration of the hot and cold water system 1 will be described with reference to FIG.

[0012] The chilled / hot water system 1 is a system that supplies heat to a target heat load using a heat medium cooled or heated in a heat source device. The heat medium may be, for example, brine (antifreeze), water, a mixture of brine and water, or a mixture of water and an additive with a high anticorrosion effect. In this embodiment, water (chilled / hot water) is used as the heat medium, for example.

[0013] The chilled / hot water system 1 includes, for example, a heat source unit 10, an energy consumption sensor 11, a chilled / hot water outlet temperature sensor 12, a chilled / hot water inlet temperature sensor 13, a supply temperature sensor 14, a pump 20, a bypass valve 23, a supply primary header 24a, a supply secondary header 24b, a return header 25, a bypass pipe 26, a bypass valve 27, an air conditioner 30, a flow control valve 31, and a control device 100.

[0014] A chilled / hot water circulation circuit, which is an example of a heat medium circulation circuit, is configured by these components included in the chilled / hot water system 1. Chilled / hot water flows as outgoing chilled / hot water through the chilled / hot water circulation circuit from the heat source unit 10 to the air conditioner 30, and as return chilled / hot water, flows through the chilled / hot water circulation circuit from the air conditioner 30 to the heat source unit 10. Note that the chilled / hot water circulation circuit may include multiple chilled / hot water circulation systems depending on the installation location of the air conditioner 30, because the required chilled / hot water transport capacity differs depending on the installation location, etc.

[0015] The chilled / hot water system 1 may include, for example, one or more heat source machines 10. For example, under the control of a heat source machine control device (not shown), the heat source machine 10 consumes fuel (gas, etc.) or electricity to generate heat or acquires heat from outside air using an auxiliary heat source machine (not shown), and adds the generated or acquired heat to the chilled / hot water to cool or heat the chilled / hot water. The heat added to the chilled / hot water may be cold heat acquired from outside air by utilizing the thermal properties of a substance due to a change in state, or hot heat generated by converting chemical energy into thermal energy by burning fuel. The heat source machine 10 may include, for example, a refrigeration cycle device (not shown) that configures a refrigerant circuit that circulates a refrigerant, and may cool or heat water using the refrigeration cycle.

[0016] The heat source machine 10 has, for example, a set temperature S for chilled and hot water. The set temperature may include a chilled water temperature set value SPC [°C] and a hot water temperature set value SPH [°C]. The heat source machine 10 may store the set temperature S in a predetermined storage unit, or may visually display it externally. The heat source machine 10 is configured, for example, to be able to adjust the set temperature S in predetermined increments within a range from a predetermined minimum value to a predetermined maximum value. Note that in this embodiment, it is described that all of at least one heat source machine 10 included in the chilled and hot water system 1 are controlled by one common set temperature. However, at least one heat source machine 10 included in the chilled and hot water system 1 may be controlled by a set temperature different from that of the other heat source machines 10.

[0017] Each heat source machine 10 is provided with, for example, an energy consumption sensor 11 for the heat source machine 10. The energy consumption sensor 11 measures, for example, the energy consumption in the heat source machine 10. Here, the energy consumption may be defined as the amount consumed per unit time of an energy source for generating heat to be imparted to hot and cold water. For example, if the heat source machine 10 is a fuel-combustion type, the energy consumption may be defined as the volume (unit: [m^3 / s], etc.) of fuel (gas) burned per unit time, or if the heat source machine 10 is an electric type, the energy consumption may be defined as power (unit: [kW], etc.).

[0018] Downstream of each heat source unit 10, individual pipes extend from each heat source unit 10 to the outbound primary header 24a, and the outbound chilled / hot water flowing through each pipe merges in the outbound primary header 24a. The chilled / hot water outlet temperature sensor 12 is provided, for example, on the individual pipes downstream of each heat source unit 10, and measures the chilled / hot water outlet temperature TO. The chilled / hot water outlet temperature TO may include, for example, a chilled water outlet temperature TOC [°C], which is the chilled water outlet temperature, and a hot water outlet temperature TOH [°C], which is the hot water outlet temperature.

[0019] Individual pipes extend from each heat source unit 10 to the return header 25 upstream of each heat source unit 10, and the return chilled / hot water flowing through each pipe from the return header 25 flows to each heat source unit 10. The chilled / hot water inlet temperature sensor 13 is provided, for example, on the individual pipes upstream of each heat source unit 10, and measures the chilled / hot water inlet temperature TI. The chilled / hot water inlet temperature TI may include, for example, a chilled water inlet temperature TIC [°C] which is the chilled water inlet temperature, and a hot water inlet temperature TIH [°C] which is the hot water inlet temperature.

[0020] The supply temperature sensor 14 is provided, for example, in the supply primary header 24a and measures the chilled / hot water supply temperature TS. The chilled / hot water supply temperature TS may include, for example, a chilled water supply temperature TCS [°C], which is the supply temperature of the chilled water, and a hot water supply temperature THS [°C], which is the supply temperature of the hot water.

[0021] The pump 20 is an example of heat transfer equipment and has the function of consuming electricity or the like to generate power and using the generated power to circulate chilled or hot water in the chilled or hot water circulation circuit between the heat source unit 10 and the air conditioner 30. For example, under the control of a pump control device (not shown), the pump 20 sucks chilled or hot water in the chilled or hot water circulation circuit, applies pressure to it, and sends it out to circulate it in the chilled or hot water circulation circuit. The pump 20 may include, for example, a primary pump 21 and a secondary pump 22.

[0022] The chilled / hot water system 1 may include, for example, one or more primary pumps 21 provided upstream of the heat source unit 10. The primary pump 21 may also be provided downstream of the heat source unit 10. The heat source unit 10 has, as its specifications, a specified value (rated flow rate) for the chilled / hot water flow rate and a minimum value that is acceptable for maintenance purposes. The primary pump 21 is a pump that adjusts the chilled / hot water flow rate in the heat source unit 10 to, for example, a range with the minimum value as the lower limit and the rated flow rate as the upper limit. The primary pump 21 is controlled, for example, based on the chilled / hot water outlet temperature TO and the chilled / hot water inlet temperature TI, etc., so as not to interfere with the operation of the air conditioner 30.

[0023] The primary pump 21 may be controlled, for example, by variable control (frequency control of the motor rotation speed using an inverter). Specifically, the primary pump 21 may be controlled by a method in which a control instruction value is calculated from the load-side chilled / hot water flow rate determined by direct or indirect measurement, with the minimum allowable value for maintaining the heat source device 10 as the lower limit and the rated flow rate of the heat source device 10 as the upper limit, and the inverter frequency setting is changed to adjust the heat source-side chilled / hot water flow rate (primary pump flow rate). Note that, in cases where variable control of the primary pump 21 is not possible, the opening of a valve (not shown) on the discharge side of the primary pump 21a may be changed in advance to physically restrict the heat source-side chilled / hot water flow rate only when the chilled / hot water flow rate during rated operation of the primary pump 21 exceeds the rated flow rate of the heat source device. In this case, adjustments to accommodate fluctuations in the load-side chilled / hot water flow rate may not be performed. Note that, in cases where the chilled / hot water circulation circuit includes multiple chilled / hot water circulation systems, the primary pump 21 may be controlled at the same frequency for each chilled / hot water circulation system. However, if primary pumps 21 with different capacities are mixed in the system, the frequencies of the primary pumps 21 may be different.

[0024] The chilled / hot water system 1 may include, for example, one or more secondary pumps 22. The secondary pumps 22 are, for example, pumps provided via individual pipes downstream of the outbound primary header 24a, and adjust the flow rate to exceed the flow rate of chilled / hot water in the heat exchangers of the air conditioners 30 so as not to interfere with the operation of the air conditioners 30. In other words, "the total flow rate of chilled / hot water in all secondary pumps 22 > the total flow rate of chilled / hot water in the heat exchangers of all air conditioners 30."

[0025] The secondary pump 22 may be controlled, for example, by calculating a control instruction value from the heat exchanger heat medium flow rate determined by direct or indirect measurement, and then changing the inverter frequency setting to adjust the load-side heat medium flow rate (secondary pump flow rate). Alternatively, for example, a preset combination of the number of operating pumps may be selected from the heat exchanger heat medium flow rate determined by direct or indirect measurement, and the number of operating secondary pumps 22 may be increased or decreased by issuing an instruction to start or stop the pumps individually, thereby adjusting the load-side heat medium flow rate (secondary pump 22 flow rate). Note that, if the chilled / hot water circulation circuit includes multiple chilled / hot water circulation systems, the secondary pumps 22 may be controlled at the same frequency for each chilled / hot water circulation system. However, if secondary pumps 22 with different capacities are mixed within a system, the frequencies of the secondary pumps 22 may be different.

[0026] The bypass valve 23 is connected in parallel to, for example, each secondary pump 22. Chilled or hot water whose flow rate exceeds the flow rate of chilled or hot water in the heat exchanger of the air conditioner 30 passes from the outlet side of the secondary pump 22 through the bypass valve 23 and returns to the inlet side of the secondary pump 22.

[0027] The bypass pipe 26 is a pipe that connects the outgoing primary header 24a and the return header 25. The bypass pipe 26 is configured so that chilled or hot water that is not sent to the air conditioner 30 can be bypassed from the outgoing header 24 and sent to the return header 25. The bypass valve 27 is provided midway along the bypass pipe 26 and adjusts the flow rate of chilled or hot water passing through the bypass pipe 26.

[0028] The air conditioner 30 is an example of heat consumption equipment, and is a device that heats or cools air, having a heat exchanger (not shown) for exchanging heat between air (an example of a load) and hot or cold water, and a fan (not shown) for sending air to the heat exchanger. The hot or cold water system 1 may include, for example, one or more air conditioners 30. The air conditioner 30 may be, for example, a fan coil unit, an air handling unit, or the like.

[0029] A corresponding flow control valve 31 is provided downstream of each air conditioner 30. The flow control valve 31 may be configured as, for example, a two-way valve or a three-way valve. The flow control valve 31 may also be provided upstream of each air conditioner 30. The flow control valve 31 is connected to the heat exchanger via a pipe. The flow rate of the chilled or hot water in the heat exchanger can be adjusted by adjusting the opening of the flow control valve 31. The air conditioner 30 and the flow control valve 31 may operate under the control of an air conditioner control device (not shown). For example, the opening of the flow control valve 31 may be controlled based on a calculated difference between the temperature of the air (supply air) after heat exchange measured by the air conditioner 30 and the set temperature of the air conditioner 30. Furthermore, for example, the rotation speed of a fan may be controlled to adjust the flow rate of air in the heat exchanger. The chilled or hot water discharged from the air conditioner 30 via the flow control valve 31 flows into the return header 25 as return chilled or hot water.

[0030] The control device 100 may be a computer or information processing device including a memory that stores data and programs and a processor that executes information processing on the data, etc., based on the programs. The memory may include, for example, a volatile storage device such as a random access memory (RAM) that can temporarily store data, or a non-volatile auxiliary storage device such as a hard disk or a flash memory that can store data for a long period of time. The processor may be, for example, a central processing unit (CPU) or a micro processing unit (MPU). The programs stored in the control device 100 may be provided to the control device 100 via a non-transitory storage medium that is readable by a computer. The control device 100 may be configured to be able to execute at least some of the functions of a heat source device control device, a pump control device, and an air conditioner control device (not shown).

[0031] 2 is a schematic diagram showing an example of the functional configuration of the control device 100 according to the embodiment. The control device 100 includes, for example, a storage unit 110 and a processing unit 120. The storage unit 110 stores, for example, a heat source unit operation state table 111, a pump operation state table 112, a heat source unit energy consumption change amount table 113, and a pump energy consumption change amount table 114.

[0032] FIG. 3 is a schematic diagram showing an example of the data structure of the heat source unit operating state table 111. As shown in FIG.

[0033] The heat source machine operating state table 111 is a table that records the operating state (heat source machine operating state) of the heat source machine 10. For example, as shown in Fig. 3, the heat source machine operating state table 111 may include the number of operating heat source machines, the set temperature S, the chilled / hot water outlet temperature TO, and the chilled / hot water inlet temperature TI, which are associated with a heat source machine operating state ID that is identification information for identifying the heat source machine operating state.

[0034] The number of operating heat source machines is the number of operating heat source machines 10 out of at least one heat source machine 10 provided in the chilled / hot water system 1. The number of operating heat source machines can be obtained, for example, from a heat source machine control device (not shown). The set temperature S is the set temperature [°C] of the heat source machine 10 operating in the chilled / hot water system 1. The set temperature S may be the chilled water set temperature SC [°C] or the hot water set temperature SH [°C]. The set temperature S can be obtained, for example, from a heat source machine control device (not shown). The chilled / hot water outlet temperature TO is the chilled / hot water outlet temperature [°C] detected by the chilled / hot water outlet temperature sensor 12. The chilled / hot water outlet temperature TO may be the chilled water outlet temperature TOC [°C], which is the chilled water outlet temperature, or the hot water outlet temperature TOH [°C], which is the hot water outlet temperature. The chilled / hot water inlet temperature TI is the chilled / hot water inlet temperature [°C] detected by the chilled / hot water inlet temperature sensor 13. The chilled / hot water inlet temperature TI may be a chilled water inlet temperature TIC [°C] which is the inlet temperature of chilled water, or a hot water inlet temperature TIH [°C] which is the inlet temperature of hot water.

[0035] Fig. 4 is a schematic diagram showing an example of the data structure of the pump operating status table 112. The pump operating status table 112 is a table that records the operating status (pump operating status) of the pumps 20 (primary pump 21 and secondary pump 22). For example, as shown in Fig. 4, the pump operating status table 112 may include the number of operating pumps, the pump operating frequency F, and the chilled / hot water supply temperature TS, all of which are associated with a pump operating status ID, which is identification information for identifying the pump operating status.

[0036] The number of operating pumps is the number of operating pumps 20 among at least one pump 20 included in the chilled / hot water system 1. The number of operating pumps can be obtained, for example, from a pump control device (not shown). The pump operating frequency F is the operating frequency F [Hz] of the pump 20 operating in the chilled / hot water system 1. The pump operating frequency F may be a different value for each operating pump 20, or may be the same value for multiple operating pumps 20. In particular, the pump operating frequency F of the pumps 20 (primary pump 21 and secondary pump 22) belonging to the same chilled / hot water circulation system may be the same. The pump operating frequency F can be obtained, for example, from a pump control device (not shown). The chilled / hot water return temperature TS is the temperature [°C] of the incoming chilled / hot water detected by the return temperature sensor 14. The chilled / hot water return temperature TS may be the chilled water return temperature TSC [°C], which is the temperature of the incoming chilled water, or the hot water return temperature TSH [°C], which is the temperature of the incoming hot water.

[0037] Fig. 5 is a schematic diagram showing an example of the data structure of the heat source machine energy consumption change amount table 113. The heat source machine energy consumption change amount table 113 is an example of a first table, and is a table in which the change in the heat source machine energy consumption of the heat source machine 10 (heat source machine energy consumption change amount) when the set temperature S of the heat source machine 10 changes by a predetermined value is recorded in association with the heat source machine operating state. For example, as shown in Fig. 5, the heat source machine energy consumption change amount table 113 may include a pre-change heat source machine energy consumption ER, a post-change heat source machine energy consumption EUR and a heat source machine energy consumption change ΔEUR when the set temperature S of the heat source machine 10 increases by a predetermined value, all associated with the heat source machine operating state ID, and a post-change heat source machine energy consumption EDR and a heat source machine energy consumption change ΔEDR when the set temperature S of the heat source machine 10 decreases by a predetermined value.

[0038] The heat source machine operating state IDs included in the heat source machine energy consumption change amount table 113 correspond to the heat source machine operating state IDs included in the heat source machine operating state table 111. The heat source machine energy consumption ER before the change is the energy consumption of the heat source machine 10 in the heat source machine operating state indicated by the heat source machine operating state ID. The heat source machine energy consumption ER before the change may be defined as, for example, the volume of gas consumed per unit time (unit: [m^3 / s], etc.) when the energy source of the heat source machine 10 is gas, or as power (unit: [kW], etc.) when the energy source of the heat source machine 10 is electricity.

[0039] The post-change heat source machine energy consumption EUR is the energy consumption of the heat source machine 10 in the heat source machine operating state after the set temperature S of the heat source machine 10 has increased by a predetermined value. Like the pre-change heat source machine energy consumption ER, the post-change heat source machine energy consumption EUR may be defined as, for example, the volume of gas consumed per unit time (unit: [m^3 / s], etc.) when the energy source of the heat source machine 10 is gas, or as power (unit: [kW], etc.) when the energy source of the heat source machine 10 is electricity. The heat source machine energy consumption change amount ΔEUR (an example of a first energy consumption change amount) is the difference between the pre-change heat source machine energy consumption ER and the post-change heat source machine energy consumption EUR, i.e., EUR-ER.

[0040] The post-change heat source machine energy consumption EDR is the energy consumption of the heat source machine 10 in the heat source machine operating state after the set temperature S of the heat source machine 10 has been reduced by a predetermined value. Like the pre-change heat source machine energy consumption ER, the post-change heat source machine energy consumption EDR may be defined as, for example, the volume of gas consumed per unit time (unit: [m^3 / s], etc.) when the energy source of the heat source machine 10 is gas, or as power (unit: [kW], etc.) when the energy source of the heat source machine 10 is electricity. The heat source machine energy consumption change ΔEDR (an example of a first energy consumption change) is the difference between the pre-change heat source machine energy consumption ER and the post-change heat source machine energy consumption EDR, i.e., EDR-ER.

[0041] 6 is a schematic diagram showing an example of the data structure of the pump energy consumption change amount table 114. The pump energy consumption change amount table 114 is an example of a second table, and is a table in which the change in pump energy consumption (pump energy consumption change amount) of the pump 20 (primary pump 21 and secondary pump 22) when the set temperature S of the heat source machine 10 changes by a predetermined value is recorded in association with the pump operating state. For example, as shown in FIG. 6, the pump energy consumption change amount table 114 may include, associated with the pump operating state ID, a pre-change pump operating frequency FP, a pre-change pump energy consumption EP, a post-change pump operating frequency FUP, a post-change pump energy consumption EUP, and a pump energy consumption change amount ΔEUP when the set temperature S of the heat source machine 10 increases by the predetermined value, and a post-change pump operating frequency FDP, a post-change pump energy consumption EDP, and a pump energy consumption change amount ΔEDP when the set temperature S of the heat source machine 10 decreases by the predetermined value.

[0042] The pump operating state IDs included in the pump energy consumption change amount table 114 correspond to the pump operating state IDs included in the pump operating state table 112. The pre-change pump operating frequency FP is the operating frequency of the pump 20 in the pump operating state indicated by the pump operating state ID. The pre-change pump energy consumption EP is the sum of the energy consumption of each pump 20 in the pump operating state indicated by the pump operating state ID. In particular, when the pumps 20 are controlled at the same operating frequency F for each chilled or hot water system, the pre-change pump energy consumption EP may be defined as the sum of the energy consumption of the pumps 20 for each system. The pre-change pump energy consumption EP may be defined as power (unit: [kW], etc.).

[0043] The post-change pump operating frequency FUP is the operating frequency of each pump 20 in the pump operating state after the set temperature S of the heat source machine 10 has increased by a predetermined value. The post-change pump energy consumption EUP is the sum of the energy consumption of each pump 20 in the pump operating state after the set temperature S of the heat source machine 10 has increased by a predetermined value. In particular, when the pumps 20 are controlled at the same operating frequency F for each chilled or hot water system, the post-change pump energy consumption EUP may be defined as the sum of the energy consumption of the pumps 20 for each system. The post-change pump energy consumption EUP may be defined as power (unit: [kW], etc.). The pump energy consumption change ΔEUP (an example of a second energy consumption change) is the difference between the pre-change pump energy consumption EP and the post-change pump energy consumption EUP, i.e., EUP-EP.

[0044] The post-change pump operating frequency FDP is the operating frequency of each pump 20 in the pump operating state after the set temperature S of the heat source machine 10 has been reduced by a predetermined value. The post-change pump energy consumption EDP is the sum of the energy consumption of each pump 20 in the pump operating state after the set temperature S of the heat source machine 10 has been reduced by a predetermined value. In particular, when the pumps 20 are controlled at the same operating frequency F for each chilled or hot water system, the post-change pump energy consumption EDP may be defined as the sum of the energy consumption of the pumps 20 for each system. The post-change pump energy consumption EDP may be defined as power (unit: [kW], etc.). The pump energy consumption change ΔEDP (an example of a second energy consumption change) is the difference between the pre-change pump energy consumption EP and the post-change pump energy consumption EDP, i.e., EDP-EP.

[0045] 2, the following describes the processing unit 120 included in the control device 100. The processing unit 120 includes a table creation unit 130 and an operation balance control unit 140.

[0046] The table creation unit 130 creates tables such as a heat source machine operation status table 111, a pump operation status table 112, a heat source machine energy consumption change amount table 113, and a pump energy consumption change amount table 114. The table creation unit 130 includes, for example, an operation status information acquisition unit 131, an energy consumption acquisition unit 132, a heat source machine control unit 133, and an energy consumption change amount calculation unit 134.

[0047] The operating state information acquiring unit 131, for example, acquires information indicating the operating state of the heat source machine 10 (heat source machine operating state information) and records it in the heat source machine operating state table 111. The operating state information acquiring unit 131 may acquire information indicating whether the heat source machine 10 is operating or not, for example, from a heat source machine control device (not shown). The operating state information acquiring unit 131 may acquire the number of operating heat source machines 10 in the chilled / hot water system 1 by aggregating the information and calculating the number of operating heat source machines 10. The operating state information acquiring unit 131 may acquire the set temperature S of the heat source machine 10, for example, from a heat source machine control device (not shown). The operating state information acquiring unit 131 may acquire the chilled / hot water outlet temperature TO (chilled water outlet temperature TOC [°C] which is the chilled water outlet temperature, or hot water outlet temperature TOH [°C] which is the hot water outlet temperature) from the chilled / hot water outlet temperature sensor 12, for example. The operating state information acquiring unit 131 may acquire, for example, a chilled / hot water inlet temperature TI (a chilled water inlet temperature TIC [°C] which is the chilled water inlet temperature, or a hot water inlet temperature TIH [°C] which is the hot water inlet temperature) from the chilled / hot water inlet temperature sensor 13. The operating state information acquiring unit 131 may acquire, for example, information indicating the operating state of the pump 20 (pump operating state information) and record the information in the pump operating state table 112. The operating state information acquiring unit 131 may acquire, for example, information indicating whether the pump 20 is operating from a pump control device (not shown). The operating state information acquiring unit 131 may acquire the number of operating pumps 20 in the chilled / hot water system 1 by calculating the number of operating pumps 20. The operating state information acquiring unit 131 may acquire, for example, an operating frequency F [Hz] of the pump 20 operating in the chilled / hot water system 1 from a pump control device (not shown). The operating frequency F may be a different value for each operating pump 20, or may be the same value for the operating pumps 20. In particular, the pump operating frequencies F of the pumps 20 (primary pump 21 and secondary pump 22) belonging to the same chilled / hot water circulation system may be the same.

[0048] The energy consumption acquisition unit 132, for example, acquires the heat source machine energy consumption ER (the sum of the amounts consumed per unit time by the energy sources for generating heat to be added to the chilled or heated water in all of the heat source machines 10 operating in the chilled or heated water system 1) and records this in association with the heat source machine operating state ID in the heat source machine energy consumption change table 113. For example, if the heat source machine 10 is a fuel combustion type, the energy consumption acquisition unit 132 may acquire the heat source machine energy consumption ER from the energy consumption sensor 11 provided in the heat source machine 10. Furthermore, if the heat source machine 10 is an electric type, for example, the energy consumption acquisition unit 132 may acquire the heat source machine energy consumption ER by calculating the heat source machine energy consumption ER based on the following formula: Heat source machine energy consumption ER [kW] = Heat source machine rated power consumption [kW] * (heat source machine operating frequency [Hz] / heat source machine rated frequency [Hz])^3

[0049] The energy consumption acquisition unit 132 may, for example, acquire pump energy consumption EP (the sum of energy consumption per unit time of all pumps 20 operating in the chilled / heated water system 1) and record it in the pump energy consumption change table 114 in association with the pump operating state ID. The energy consumption acquisition unit 132 may, for example, acquire various parameters from a pump control device (not shown) and then calculate the pump energy consumption EP based on the parameters to acquire the pump energy consumption EP. The energy consumption acquisition unit 132 may, for example, calculate the pump energy consumption EP based on the following equation: Pump energy consumption EP [kW] = Pump rated power consumption [kW] * (Pump operating frequency [Hz] / Pump rated frequency [Hz])^3

[0050] The heat source machine control unit 133 controls the set temperature S of the heat source machine 10, for example, when creating various tables. The heat source machine control unit 133 may, for example, change (increase or decrease) the set temperature S of the heat source machine 10 by a predetermined value. The predetermined value may, for example, be the smallest unit set for the heat source machine 10 for changing the set temperature S of the heat source machine 10.

[0051] Furthermore, the predetermined value may be small enough that the amount of change in the first variable that defines the heat source machine energy consumption ER when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered the same as the amount of change in the first variable that defines the heat source machine energy consumption ER when the set temperature S of the heat source machine 10 is decreased by the predetermined value. The first variable may be the energy consumption of the heat source machine 10, or the operating frequency of the heat source machine 10 if the heat source machine 10 is electric.

[0052] Furthermore, the predetermined value may be small enough that the amount of change in the second variable that defines the energy consumption EP of the pump 20 when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered the same as the amount of change in the second variable that defines the energy consumption EP of the pump 20 when the set temperature S of the heat source machine 10 is decreased by the predetermined value. The second variable may be the operating frequency of the pump 20. The energy consumption change calculation unit 134 calculates the amount of change in energy consumption of the heat source machine 10 and the pump 20 when the set temperature S of the heat source machine 10 is changed. Furthermore, the energy consumption change calculation unit 134 records the calculated amount of change in energy consumption in various tables.

[0053] The energy consumption change calculation unit 134 calculates, for example, the "heat source machine energy consumption change ΔEUR" when "the set temperature S is increased by a predetermined value" and the "heat source machine energy consumption change ΔEDR" when "the set temperature S is decreased by a predetermined value", and records these in the heat source machine energy consumption change table 113. The energy consumption change calculation unit 134 calculates, for example, the "pump energy consumption change ΔEUP" when "the set temperature S is increased by a predetermined value" and the "pump energy consumption change ΔEDP" when "the set temperature S is decreased by a predetermined value", and records these in the pump energy consumption change table 114.

[0054] The determination unit 135 makes a determination regarding the operating states of the heat source machine 10 and the pump 20, for example, when creating various tables. For example, the determination unit 135 may determine whether the set temperature S of the heat source machine 10 is not the maximum value in order to confirm whether control to increase the set temperature S of the heat source machine 10 is possible. For example, the determination unit 135 may determine whether the set temperature S of the heat source machine 10 is not the minimum value in order to confirm whether control to decrease the set temperature S of the heat source machine 10 is possible. For example, the determination unit 135 may determine whether the pump 20 is not in a maximum operating state in order to confirm whether the output of the pump 20 can be increased by performing control to decrease the set temperature S of the heat source machine 10. For example, the determination unit 135 may determine whether the pump 20 is not in a minimum operating state in order to confirm whether the output of the pump 20 can be decreased by performing control to increase the set temperature S of the heat source machine 10.

[0055] The operation balance control unit 140 controls the set temperature S of the heat source unit 10, for example, so as to reduce the energy consumption cost of the entire chilled / hot water system 1. The operation balance control unit 140 includes, for example, an operation state determination unit 141, an energy cost change amount calculation unit 142, a heat source unit control unit 143, and a determination unit 144.

[0056] The operating state determination unit 141, for example, acquires various parameters of the heat source machine 10, and then refers to the heat source machine operating state table 111 to determine the current operating state of the heat source machine 10. Specifically, for example, the operating state determination unit 141 acquires the number of operating heat source machines and the set temperature S from a heat source machine control device (not shown), acquires the chilled / hot water outlet temperature TO from the chilled / hot water outlet temperature sensor 12, and acquires the chilled / hot water inlet temperature TI from the chilled / hot water inlet temperature sensor 13. The operating state determination unit 141 refers to the heat source machine operating state table 111 and determines the operating state corresponding to the acquired information (number of operating heat source machines, set temperature S, chilled / hot water outlet temperature TO, chilled / hot water inlet temperature TI) (including the case where an error is within a predetermined range) as the current operating state of the heat source machine 10.

[0057] The operating state determination unit 141, for example, acquires various parameters of the pumps 20 and then refers to the pump operating state table 112 to determine the current operating states of the pumps 20. Specifically, for example, the operating state determination unit 141 acquires from each pump 20 whether or not it is operating, and then calculates the number of operating pumps 20 as the number of operating pumps. The operating state determination unit 141 also acquires the pump operating frequency F from each pump 20. The operating state determination unit 141 refers to the pump operating state table 112 and determines the operating state corresponding to the acquired information (number of operating pumps, pump operating frequency F) as the current operating state of the pump 20.

[0058] The energy cost change calculation unit 142 calculates an energy cost change amount ΔCUS (an example of a first energy cost change amount), which is the change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source unit 10 increases by a predetermined value, and an energy cost change amount ΔCDS (an example of a second energy cost change amount), which is the change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source unit 10 decreases by a predetermined value.

[0059] The energy cost change amount ΔCUS is calculated, for example, as the sum of the heat source machine energy cost change amount ΔCUR and the pump energy cost change amount ΔCUP. Here, the heat source machine energy cost change amount ΔCUR is the amount of change in energy cost equivalent to the heat source machine energy consumption change amount ΔEUR when the set temperature S of the heat source machine 10 increases by a predetermined value. Furthermore, the pump energy cost change amount ΔCUP is the amount of change in energy cost equivalent to the pump energy consumption change amount ΔEUP when the set temperature S of the heat source machine 10 increases by a predetermined value. In particular, when the pump 20 is controlled at the same operating frequency F for each chilled or hot water system, the pump energy cost change amount ΔCUP may be defined as the sum of the pump energy cost changes for each system.

[0060] The energy cost change amount ΔCDS is calculated, for example, as the sum of the heat source machine energy cost change amount ΔCDR and the pump energy cost change amount ΔCDP. Here, the heat source machine energy cost change amount ΔCDR is the amount of change in energy cost corresponding to the heat source machine energy consumption change amount ΔEDR when the set temperature S of the heat source machine 10 is reduced by a predetermined value. Furthermore, the pump energy cost change amount ΔCDP is the amount of change in energy cost corresponding to the pump energy consumption change amount ΔEDP when the set temperature S of the heat source machine 10 is reduced by a predetermined value. In particular, when the pump 20 is controlled at the same operating frequency F for each chilled or hot water system, the pump energy cost change amount ΔCDP may be defined as the sum of the pump energy cost changes for each system.

[0061] Each energy cost change amount (heat source machine energy cost change amounts ΔCUR, ΔCDR, pump energy cost change amounts ΔCUP, ΔCDP) is calculated by multiplying each energy consumption change amount by the cost of the energy source. The unit cost of the energy source of the heat source machine 10 may be the unit cost of gas (unit: [yen / m^3], etc.) when the energy source of the heat source machine 10 is gas, or may be the unit cost of electricity (unit: [yen / kW], etc.) when the energy source of the heat source machine 10 is electricity. The unit cost of the energy source of the pump 20 may be the unit cost of electricity (unit: [yen / kW], etc.) when the energy source of the pump 20 is electricity. These unit cost prices may be current prices or values ​​calculated by any method.

[0062] The heat source machine control unit 143 controls the set temperature S of the heat source machine 10 so as to reduce the energy cost of the chilled / hot water system 1, based on an energy cost change amount ΔCUS, which is the amount of change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 increases by a predetermined value, and an energy cost change amount ΔCDS, which is the amount of change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 decreases by a predetermined value. Specifically, for example, if the energy cost change amount ΔCUS, which is the amount of change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 increases by a predetermined value, is less than zero, the heat source machine control unit 143 may cause the heat source machine 10 to increase the set temperature S of the heat source machine 10 by the predetermined value. Furthermore, for example, if the energy cost change amount ΔCDS, which is the amount of change in the energy cost of the hot and cold water system 1 when the set temperature S of the heat source machine 10 is reduced by a predetermined value, is smaller than zero, the heat source machine control unit 143 may cause the heat source machine 10 to reduce the set temperature S of the heat source machine 10 by a predetermined value. Furthermore, for example, if the energy cost change amount ΔCUS and the energy cost change amount ΔCDS are both positive values, the heat source machine control unit 143 may maintain the set temperature S of the heat source machine 10. Note that the control of the set temperature S of the heat source machine 10 by the heat source machine control unit 143 may be executed according to the determination result of the determination unit 144.

[0063] For example, the determination unit 144 determines the operating states of the heat source machine 10 and the pump 20 when the heat source machine control unit 143 controls the heat source machine 10. For example, the determination unit 144 may determine whether the set temperature S of the heat source machine 10 is not at the maximum value in order to check whether control to increase the set temperature S of the heat source machine 10 is possible. For example, the determination unit 144 may determine whether the set temperature S of the heat source machine 10 is not at the minimum value in order to check whether control to decrease the set temperature S of the heat source machine 10 is possible. For example, the determination unit 144 may determine whether the pump 20 is not in a maximum operating state in order to check whether the output of the pump 20 can be increased by performing control to decrease the set temperature S of the heat source machine 10. For example, the determination unit 144 may determine whether the pump 20 is not in a minimum operating state in order to check whether the output of the pump 20 can be decreased by performing control to increase the set temperature S of the heat source machine 10.

[0064] 7 is an operational flow diagram showing an example of operational processing relating to the creation of various tables by the table creation unit 130 of the control device 100 according to the embodiment. In the following, the heat source machine 10 will be described as being of a fuel combustion type.

[0065] (S101) The determination unit 135 determines whether the set temperature S of the heat source unit 10 is not the maximum value. If the determination unit 135 determines that the set temperature S of the heat source unit 10 is not the maximum value (S101; Yes), the processing proceeds to step S102.

[0066] (S102) The determination unit 135 determines whether or not the pump 20 is not in the minimum operating state. If the determination unit 135 determines that the pump 20 is not in the minimum operating state (S102; Yes), the process proceeds to step S103.

[0067] (S103) The operating state information acquisition unit 131 acquires heat source machine operating state information indicating the operating state of the heat source machine 10, and records the information in association with the heat source machine operating state ID in the heat source machine operating state table 111. Specifically, the operating state information acquisition unit 131 acquires the number of operating heat source machines 10 from a heat source machine control device (not shown), and records the number in association with the heat source machine operating state ID in the heat source machine operating state table 111. The operating state information acquisition unit 131 also acquires a set temperature S from a heat source machine control device (not shown), acquires a chilled / hot water outlet temperature TO from the chilled / hot water outlet temperature sensor 12, and acquires a chilled / hot water inlet temperature TI from the chilled / hot water inlet temperature sensor 13, and then records these in the heat source machine operating state table 111 in association with the heat source machine operating state ID.

[0068] (S104) The energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER and records it as "heat source machine energy consumption ER before change" in association with the heat source machine operating state ID of step S103 in the heat source machine energy consumption change table 113. Specifically, the energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER from the energy consumption sensor 11 provided in the heat source machine 10, and records it as "heat source machine energy consumption ER before change" in the heat source machine energy consumption change table 113 in association with the heat source machine operating state ID of step S103.

[0069] (S105) The operating state information acquisition unit 131 acquires pump operating state information indicating the operating state of the pump 20, and records the information in association with the pump operating state ID in the pump operating state table 112. Specifically, the operating state information acquisition unit 131 acquires the number of operating pumps 20 from a pump control device (not shown), and records the number in association with the pump operating state ID in the pump operating state table 112. The operating state information acquisition unit 131 also acquires the pump operating frequency F from the pump control device (not shown), and acquires the chilled / hot water supply temperature TS from the supply temperature sensor 14, and then records these in the pump operating state table 112 in association with the pump operating state ID.

[0070] (S106) The energy consumption acquisition unit 132 acquires the pump energy consumption EP and records it as "pre-change pump energy consumption EP" in association with the pump operating state ID of step S105 in the pump energy consumption change table 114. Specifically, the energy consumption acquisition unit 132 acquires various parameters, calculates the pump energy consumption EP based on the parameters, and acquires the pump energy consumption EP, which is then recorded in association with the pump operating state ID of step 105 in the pump energy consumption change table 114. The energy consumption acquisition unit 132 calculates the pump energy consumption EP based on the following formula: Pump energy consumption EP [kW] = Pump rated power consumption [kW] * (Pump operating frequency [Hz] / Pump rated frequency [Hz])^3

[0071] (S107) The heat source machine control unit 133 increases the set temperature S of the heat source machine 10 by a predetermined value. The predetermined value is the smallest unit set in the heat source machine 10 for changing the temperature of the heat source machine 10. In this case, the smallest unit (predetermined value) is small enough that the amount of change in the heat source machine energy consumption ER (an example of a first variable) when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered to be the same as the amount of change in the heat source machine energy consumption ER (an example of a first variable) when the set temperature S of the heat source machine 10 is decreased by the predetermined value. Furthermore, the smallest unit (predetermined value) is small enough that the amount of change in the pump operation frequency F (an example of a second variable) when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered to be the same as the amount of change in the pump operation frequency F (an example of a second variable) when the set temperature S of the heat source machine 10 is decreased by the predetermined value.

[0072] (S108) The energy consumption acquisition unit 132 acquires the "heat source machine energy consumption EUR after change" when "the set temperature S is increased by a predetermined value" and the "heat source machine energy consumption EDR after change" when "the set temperature S is decreased by a predetermined value", and records them in the heat source machine energy consumption change table 113 in association with the heat source machine operating state ID of step S104. Specifically, the energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER from the energy consumption sensor 11 provided in the heat source machine 10, and records it in the heat source machine energy consumption change table 113 as the "heat source machine energy consumption EUR after change" when "the set temperature S is increased by a predetermined value". Furthermore, as described above, the predetermined value in step S107 is small enough that the amount of change in heat source machine energy consumption ER when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered to be the same as the amount of change in heat source machine energy consumption ER (an example of a first variable) when the set temperature S of the heat source machine 10 is decreased by the predetermined value. Based on this, the energy consumption acquisition unit 132 records the heat source machine energy consumption ER acquired from the energy consumption sensor 11 in the heat source machine energy consumption change amount table 113 as the "heat source machine energy consumption EDR after change" when "the set temperature S is decreased by the predetermined value."

[0073] (S109) The energy consumption change calculation unit 134 calculates the "heat source machine energy consumption change ΔEUR" when "the set temperature S is increased by a predetermined value" and the "heat source machine energy consumption change ΔEDR" when "the set temperature S is decreased by a predetermined value", and records these in the heat source machine energy consumption change table 113. Specifically, the energy consumption change calculation unit 134 calculates the difference between the "heat source machine energy consumption ER before the change" in the heat source machine energy consumption change table 113 and the "heat source machine energy consumption EUR after the change" when "the set temperature S is increased by a predetermined value", i.e., EUR-ER, as the "heat source machine energy consumption change ΔEUR", and records this in the heat source machine energy consumption change table 113. In addition, the energy consumption change calculation unit 134 calculates the difference between the ``heat source machine energy consumption ER before change'' in the heat source machine energy consumption change table 113 and the ``heat source machine energy consumption EDR after change'' when ``the set temperature S is reduced by a predetermined value'', i.e., EDR-ER, as the ``heat source machine energy consumption change ΔEDR'' and records it in the heat source machine energy consumption change table 113.

[0074] (S110) The energy consumption acquisition unit 132 acquires the "post-change pump energy consumption EUP" when "the set temperature S is increased by a predetermined value" and the "post-change pump energy consumption EDP" when "the set temperature S is decreased by a predetermined value," and records them in the pump energy consumption change table 114 in association with the pump operating state ID of step S106. Specifically, the energy consumption acquisition unit 132 acquires the pump operating frequency F, and then uses this as the "post-change pump operating frequency FUP" when "the set temperature S is increased by a predetermined value," calculates the "post-change pump energy consumption EUP" when "the set temperature S is increased by a predetermined value" based on the following formula, and records this in the pump energy consumption change table 114. Post-change pump energy consumption EUP [kW] = pump rated power consumption [kW] * (post-change pump operating frequency FUP [Hz] / pump rated frequency [Hz])^3

[0075] Furthermore, as described above, the predetermined value in step S107 is small enough that the amount of change in the pump operation frequency F (an example of a second variable) when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered to be the same as the amount of change in the pump operation frequency F (an example of a second variable) when the set temperature S of the heat source machine 10 is decreased by the predetermined value. Based on this, the energy consumption acquisition unit 132 calculates the "post-change pump operation frequency FDP" when "the set temperature S is decreased by the predetermined value" based on the acquired pump operation frequency F. Then, the energy consumption acquisition unit 132 calculates the "post-change pump energy consumption EDP" when "the set temperature S is decreased by the predetermined value" based on the following formula, and records it in the pump energy consumption change amount table 114. Post-change pump energy consumption EDP [kW] = pump rated power consumption [kW] * (post-change pump operating frequency FDP [Hz] / pump rated frequency [Hz])^3

[0076] (S111) The energy consumption change calculation unit 134 calculates the "pump energy consumption change ΔEUP" when "the set temperature S is increased by a predetermined value" and the "pump energy consumption change ΔEDP" when "the set temperature S is decreased by a predetermined value", and records these in the pump energy consumption change table 114. Specifically, the energy consumption change calculation unit 134 calculates the difference between the "pump energy consumption EP before change" in the pump energy consumption change table 114 and the "pump energy consumption EUP after change" when "the set temperature S is increased by a predetermined value", i.e., EUP - EP, as the "pump energy consumption change ΔEUP", and records this in the pump energy consumption change table 114. Furthermore, the energy consumption change calculation unit 134 calculates the difference between the "pump energy consumption EP before the change" in the pump energy consumption change table 114 and the "pump energy consumption EDP after the change" when "the set temperature S is reduced by a predetermined value," i.e., EDP-EP, as the "pump energy consumption change ΔEDP," and records this in the pump energy consumption change table 114. Next, the process returns to step S101.

[0077] In step S101, if it is determined that the set temperature of the heat source unit 10 is the maximum value (S101; No), or in step S102, if it is determined that the pump 20 is in a minimum operating state (S102; No), the processing proceeds to step S112.

[0078] (S112) The determination unit 135 determines whether the set temperature S of the heat source unit 10 is not the minimum value. If the determination unit 135 determines that the set temperature S of the heat source unit 10 is not the minimum value (S112; Yes), the processing proceeds to step S113.

[0079] (S113) The determination unit 135 determines whether or not the pump 20 is not in a maximum operating state. If the determination unit 135 determines that the pump is not in a maximum operating state (S113; Yes), the process proceeds to step S114.

[0080] (S114) The operating status information acquisition unit 131 acquires heat source machine operating status information indicating the operating status of the heat source machine 10, and records the information in association with the heat source machine operating status ID in the heat source machine operating status table 111. Specifically, the operating status information acquisition unit 131 acquires the number of operating heat source machine control devices (heat source machines 10) (not shown), and records the number in association with the heat source machine operating status ID in the heat source machine operating status table 111. The operating status information acquisition unit 131 also acquires a set temperature S from a heat source machine control device (not shown), acquires a chilled / hot water outlet temperature TO from the chilled / hot water outlet temperature sensor 12, and acquires a chilled / hot water inlet temperature TI from the chilled / hot water inlet temperature sensor 13, and records these in association with the heat source machine operating status ID in the heat source machine operating status table 111.

[0081] (S115) The energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER and records it as "heat source machine energy consumption ER before change" in association with the heat source machine operating state ID of step S114 in the heat source machine energy consumption change table 113. Specifically, the energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER from the energy consumption sensor 11 provided in the heat source machine 10, and then records it as "heat source machine energy consumption ER before change" in the heat source machine energy consumption change table 113 in association with the heat source machine operating state ID of step S114.

[0082] (S116) The operating state information acquisition unit 131 acquires pump operating state information indicating the operating state of the pump 20, and records the information in the pump operating state table 112 in association with a pump operating state ID. Specifically, the operating state information acquisition unit 131 acquires the number of operating pumps 20 from a pump control device (not shown), and records this in the pump operating state table 112. The operating state information acquisition unit 131 also acquires the pump operating frequency F from the pump control device (not shown), and acquires the chilled / hot water return temperature TS from the return temperature sensor 14, and records these in the pump operating state table 112.

[0083] (S117) The energy consumption acquisition unit 132 acquires the pump energy consumption EP and records it as "pre-change pump energy consumption EP" in the pump energy consumption change table 114 in association with the pump operating state ID of step S116. Specifically, the energy consumption acquisition unit 132 acquires various parameters, calculates the pump energy consumption EP based on the parameters, and acquires the pump energy consumption EP, which is then recorded in the pump energy consumption change table 114 in association with the pump operating state ID of step S116. The energy consumption acquisition unit 132 calculates the pump energy consumption EP based on the following: Pump energy consumption EP [kW] = Pump rated power consumption [kW] * (Pump operating frequency [Hz] / Pump rated frequency [Hz])^3

[0084] (S118) The heat source machine control unit 133 decreases the set temperature S of the heat source machine 10 by a predetermined value in step S107.

[0085] (S119) The energy consumption acquisition unit 132 acquires the "heat source machine energy consumption EDR after change" when "the set temperature S is decreased by a predetermined value" and the "heat source machine energy consumption EUR after change" when "the set temperature S is increased by a predetermined value", and records them in the heat source machine energy consumption change table 113 in association with the heat source machine operating state ID of step S115. Specifically, the energy consumption acquisition unit 132 acquires the heat source machine energy consumption ER from the energy consumption sensor 11 provided in the heat source machine 10, and records it in the heat source machine energy consumption change table 113 as the "heat source machine energy consumption EDR after change" when "the set temperature S is decreased by a predetermined value". Furthermore, as described above, the amount of change in heat source machine energy consumption ER when the set temperature S of the heat source machine 10 is increased by a predetermined value can be considered to be the same as the amount of change in heat source machine energy consumption ER (an example of a first variable) when the set temperature S of the heat source machine 10 is decreased by a predetermined value. Therefore, the energy consumption acquisition unit 132 records the heat source machine energy consumption ER acquired from the energy consumption sensor 11 in the heat source machine energy consumption change amount table 113 as the "heat source machine energy consumption EUR after change" when "the set temperature S is increased by a predetermined value."

[0086] (S120) The energy consumption change calculation unit 134 calculates the "heat source machine energy consumption change ΔEDR" when "the set temperature S is decreased by a predetermined value" and the "heat source machine energy consumption change ΔEUR" when "the set temperature S is increased by a predetermined value", and records these in the heat source machine energy consumption change table 113. Specifically, the energy consumption change calculation unit 134 calculates the difference between the "heat source machine energy consumption ER before the change" in the heat source machine energy consumption change table 113 and the "heat source machine energy consumption EDR after the change" when "the set temperature S is decreased by a predetermined value", i.e., EDR-ER, as the "heat source machine energy consumption change ΔEDR", and records this in the heat source machine energy consumption change table 113. In addition, the energy consumption change calculation unit 134 calculates the difference between the ``heat source machine energy consumption ER before the change'' in the heat source machine energy consumption change table 113 and the ``heat source machine energy consumption EUR after the change'' when ``the set temperature S is increased by a predetermined value'', i.e., EUR-ER, as the ``heat source machine energy consumption change ΔEUR'' and records it in the heat source machine energy consumption change table 113.

[0087] (S121) The energy consumption acquisition unit 132 acquires the "post-change pump energy consumption EDP" when "the set temperature S is decreased by a predetermined value" and the "post-change pump energy consumption EUP" when "the set temperature S is increased by a predetermined value", and records them in the pump energy consumption change table 114 in association with the pump operating state ID of step S117. Specifically, the energy consumption acquisition unit 132 acquires the pump operating frequency F, and then uses this as the "post-change pump operating frequency FDP" when "the set temperature S is decreased by a predetermined value", calculates the "post-change pump energy consumption EDP" when "the set temperature S is decreased by a predetermined value" based on the following formula, and records this in the pump energy consumption change table 114. Post-change pump energy consumption EDP [kW] = pump rated power consumption [kW] * (post-change pump operating frequency FDP [Hz] / pump rated frequency [Hz])3

[0088] Furthermore, as described above, the predetermined value in step S107 is small enough that the amount of change in the pump operation frequency F (an example of the second variable) when the set temperature S of the heat source machine 10 is increased by the predetermined value can be considered the same as the amount of change in the pump operation frequency F (an example of the second variable) when the set temperature S of the heat source machine 10 is decreased by the predetermined value. Based on this, the energy consumption acquisition unit 132 calculates the "post-change pump operation frequency FUP" when "the set temperature S is increased by the predetermined value" based on the acquired pump operation frequency F. Then, the energy consumption acquisition unit 132 calculates the "post-change pump energy consumption EUP" when "the set temperature S is increased by the predetermined value" based on the following formula, and records it in the pump energy consumption change table 114. Post-change pump energy consumption EUP [kW] = pump rated power consumption [kW] * (post-change pump operating frequency FUP [Hz] / pump rated frequency [Hz])3

[0089] (S122) The energy consumption change calculation unit 134 calculates the "pump energy consumption change ΔEDP" when "the set temperature S is decreased by a predetermined value" and the "pump energy consumption change ΔEUP" when "the set temperature S is increased by a predetermined value", and records these in the pump energy consumption change table 114. Specifically, the energy consumption change calculation unit 134 calculates the difference between the "pump energy consumption EP before change" in the pump energy consumption change table 114 and the "pump energy consumption EDP after change" when "the set temperature S is decreased by a predetermined value", i.e., EDP-EP, as the "pump energy consumption change ΔEDP", and records this in the pump energy consumption change table 114. Furthermore, the energy consumption change calculation unit 134 calculates the difference between the "pump energy consumption EP before the change" in the pump energy consumption change table 114 and the "pump energy consumption EUP after the change" when "the set temperature S is increased by a predetermined value," i.e., EUP-EP, as the "pump energy consumption change ΔEUP," and records this in the pump energy consumption change table 114. Next, the process returns to step S112.

[0090] If it is determined in step S112 that the set temperature S of the heat source machine is the minimum value (S112; No), or if it is determined in step S113 that the pump 20 is in the maximum operating state (S113; No), the processing ends.

[0091] As described above, the control device 100 according to this embodiment changes the operating states of the heat source unit 10 and the pump 20 by actually increasing / decreasing the set temperature S of the heat source unit 10 included in the chilled / hot water system 1, and acquires and records the amount of change in energy consumption before and after the change. Therefore, it is possible to acquire and record the amount of change in energy consumption that takes into account the actual behavior of the heat source unit 10 and the pump 20, taking into account various parameters such as the system configuration, installation environment, and operating state of the chilled / hot water system 1.

[0092] 8 is an operational flow diagram showing an example of operational processing related to operation balance control by the operation balance control unit 140 of the control device 100 according to the embodiment. In the following, it is assumed that the chilled / hot water system 1 is configured so that a graph of the energy cost of the chilled / hot water system 1, with the set temperature S of the heat source unit 10 as a domain, is a downward convex function.

[0093] (S201) The operating state determination unit 141 determines the current heat source machine operating state of the heat source machine 10. Specifically, the operating state determination unit 141 acquires the number of operating heat source machines and the set temperature S from a heat source machine control device (not shown), acquires the chilled / hot water outlet temperature TO from the chilled / hot water outlet temperature sensor 12, acquires the chilled / hot water inlet temperature TI from the chilled / hot water inlet temperature sensor 13, and then refers to the heat source machine operating state table 111 to determine the heat source machine operating state corresponding to the acquired parameters (set temperature S, chilled / hot water outlet temperature TO, chilled / hot water inlet temperature TI).

[0094] (S202) The operating state determination unit 141 determines the current pump operating state of the pump 20. Specifically, the operating state determination unit 141 acquires the number of operating pumps and the pump operating frequency F from a pump control device (not shown), acquires the chilled / hot water supply temperature TS from the supply temperature sensor 14, and then refers to the pump operating state table 112 to determine the pump operating state corresponding to the acquired parameters (the number of operating pumps, the pump operating frequency F, and the chilled / hot water supply temperature TS).

[0095] (S203) The energy cost change calculation unit 142 calculates the heat source machine energy cost change amount ΔCUR when the set temperature S of the heat source machine 10 is increased by a predetermined value, and the heat source machine energy cost change amount ΔCDR when the set temperature S of the heat source machine 10 is decreased by a predetermined value. Specifically, the energy cost change calculation unit 142 obtains the "heat source machine energy consumption change amount ΔEUR" for "when the heat source machine set temperature S is increased by a predetermined value" that corresponds to the heat source machine operating state determined in step S201 from the heat source machine energy consumption change amount table 113, and then multiplies this by the unit cost of the energy source of the heat source machine 10 to calculate the value obtained as the heat source machine energy cost change amount ΔCUR when the set temperature S of the heat source machine 10 is increased by the predetermined value. In addition, the "heat source machine energy consumption change amount ΔEDR" for "when the heat source machine's set temperature S is reduced by a predetermined value" corresponding to the heat source machine operating state determined in step S201 is obtained from the energy cost change amount calculation unit 142 and the heat source machine energy consumption change amount table 113, and the value obtained by multiplying this by the unit cost of the energy source of the heat source machine 10 is calculated as the heat source machine energy cost change amount ΔCDR for when the heat source machine's set temperature S is reduced by a predetermined value.

[0096] (S204) The energy cost change calculation unit 142 calculates the pump energy cost change amount ΔCUP when the set temperature S of the heat source machine 10 is increased by a predetermined value, and the pump energy cost change amount ΔCDP when the set temperature S of the heat source machine 10 is decreased by a predetermined value. Specifically, the energy cost change calculation unit 142 obtains the "pump energy consumption change amount ΔEUP" when "the set temperature S of the heat source machine is increased by a predetermined value" that corresponds to the pump operating state determined in step S202 from the pump energy consumption change amount table 114, and then multiplies this by the unit cost of the energy source of the pump 20 to calculate the value obtained as the pump energy cost change amount ΔCUP when the set temperature S of the heat source machine 10 is increased by the predetermined value. In addition, the energy cost change calculation unit 142 obtains the ``pump energy consumption change ΔEDP'' for ``when the set temperature S of the heat source machine is reduced by a predetermined value'' corresponding to the pump operating state determined in step S202 from the pump energy consumption change table 114, and then multiplies this by the unit cost of the energy source of the pump 20 to calculate the value obtained as the pump energy cost change ΔCDP for when the set temperature S of the heat source machine 10 is reduced by a predetermined value.

[0097] (S205) The energy cost change calculation unit 142 calculates an energy cost change amount ΔCUS, which is the amount of change in the energy cost of the chilled or hot water system 1 when the set temperature S of the heat source machine 10 is increased by a predetermined value, and an energy cost change amount ΔCDS, which is the amount of change in the energy cost of the chilled or hot water system 1 when the set temperature S of the heat source machine 10 is decreased by a predetermined value. Specifically, the energy cost change calculation unit 142 calculates the sum (ΔCUR+ΔCUP) of the heat source machine energy cost change amount ΔCUR and the pump energy cost change amount ΔCUP as the energy cost change amount ΔCUS of the chilled or hot water system 1 when the set temperature S of the heat source machine 10 is increased by a predetermined value. In addition, the energy cost change calculation unit 142 calculates the sum (ΔCDR+ΔCDP) of the heat source machine energy cost change amount ΔCDR and the pump energy cost change amount ΔCDP as the energy cost change amount ΔCDS of the chilled or hot water system 1 when the set temperature S of the heat source machine 10 is decreased by a predetermined value.

[0098] (S206) The heat source machine control unit 143 compares the energy cost change amount ΔCUS of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 is increased by a predetermined value, and the energy cost change amount ΔCDS of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 is decreased by a predetermined value, with zero. If both the energy cost change amount ΔCUS and the energy cost change amount ΔCDS are greater than zero ("ΔCUS>0" and "ΔCDS>0"), the processing returns to step S201.

[0099] (S207) If the change in energy cost ΔCUS of the hot and cold water system 1 when the set temperature S of the heat source machine 10 is increased by a predetermined value is less than zero (ΔCUS<0), the determination unit 144 determines whether the set temperature S of the heat source machine 10 is not the maximum value or whether the pump 20 is not in the minimum operating state. If the determination result of step S207 is negative (S207; No) (if the set temperature S of the heat source machine 10 is the maximum value or the pump 20 is in the minimum operating state), the process returns to step S201.

[0100] (S208) If the determination result of step S207 is affirmative (S207; Yes) (the set temperature of the heat source machine 10 is not at the maximum value and the pump 20 is not in the minimum operating state), the heat source machine control unit 143 increases the set temperature of the heat source machine 10 by a predetermined value. This predetermined value may be the predetermined value of step S107 described above. After step S208, the process returns to step S201.

[0101] (S209) If the energy cost change amount ΔCDS of the chilled / hot water system 1 when the set temperature S of the heat source machine 10 is reduced by a predetermined value is less than zero (ΔCDS<0), the determination unit 144 determines whether the set temperature S of the heat source machine 10 is not the minimum value or whether the pump 20 is not in a maximum operating state. If the determination result of step S209 is negative (S209; No) (if the set temperature S of the heat source machine 10 is the minimum value or the pump 20 is in a maximum operating state), the process returns to step S201.

[0102] (S210) If the determination result of step S209 is affirmative (S209; Yes) (the set temperature of the heat source machine 10 is not at the minimum value and the pump 20 is not in a maximum operating state), the heat source machine control unit 143 reduces the set temperature of the heat source machine 10 by a predetermined value. This predetermined value may be the predetermined value of step S107 described above. After step S210, the process returns to step S201.

[0103] As described above, in the chilled / hot water system 1 of this embodiment, the set temperature of the heat source unit 10 is continuously adjusted in a direction that reduces the overall energy cost of the chilled / hot water system 1 based on the energy cost change amount ΔCUS, which is the change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source unit 10 increases by a predetermined value, and the energy cost change amount ΔCDS, which is the change in the energy cost of the chilled / hot water system 1 when the set temperature S of the heat source unit 10 decreases by a predetermined value, thereby making it possible to continuously reduce the energy cost of the chilled / hot water system 1.

[0104] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The elements of the embodiments, as well as their arrangement, materials, conditions, shapes, sizes, etc., are not limited to those illustrated and can be modified as appropriate. Furthermore, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0105] 1...chilled / hot water system, 10...heat source machine, 11...energy consumption sensor, 12...chilled / hot water outlet temperature sensor, 13...chilled / hot water inlet temperature sensor, 14...feedback temperature sensor, 20...pump, 21...primary pump, 22...secondary pump, 23...bypass valve, 24a...feedback primary header and 24b...feedback secondary header, 25...return header, 26...bypass pipe, 27...bypass valve, 30...air conditioner, 31...flow control valve, 100...control device, 110...memory unit, 111...heat source machine operation Operation status table, 112...pump operation status table, 113...heat source machine energy consumption change amount table, 114...pump energy consumption change amount table, 120...processing unit, 130...table creation unit, 131...operation status information acquisition unit, 132...energy consumption acquisition unit, 133...heat source machine control unit, 134...energy consumption change amount calculation unit, 140...operation status determination unit, 142...energy cost change amount calculation unit, 143...heat source machine control unit, 144...determination unit

Claims

1. A control device for controlling a heat medium system including a heat source machine for imparting heat to a heat medium, a heat consuming facility for performing heat exchange between the heat medium and a load, and a heat transport facility for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming facility, a table creation unit that creates a first table and a second table by changing the set temperature of the heat source machine by a predetermined value, the first table is a table in which a first heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine increases by the predetermined value, and a second heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat source machine; The second table is a table in which a first heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine increases by the predetermined value, and a second heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat transport equipment. A table creation unit; an energy consumption change amount acquisition unit that acquires a first heat source unit energy consumption change amount and a second heat source unit energy consumption change amount that are associated with the current operating state of the heat source unit in the first table, and a first heat transport equipment energy consumption change amount and a second heat transport equipment energy consumption change amount that are associated with the current operating state of the heat transport equipment in the second table; an energy cost change amount calculation unit that calculates a first energy cost change amount, which is the amount of change in energy cost of the heat medium system when the set temperature of the heat source machine increases by the predetermined value, based on the acquired first heat source machine energy consumption change amount and first heat transport equipment energy consumption change amount, and calculates a second energy cost change amount, which is the amount of change in energy cost of the heat medium system when the set temperature of the heat source machine decreases by the predetermined value, based on the acquired second heat source machine energy consumption change amount and second heat transport equipment energy consumption change amount; a heat source machine control unit that controls a set temperature of the heat source machine based on the first energy cost change amount and the second energy cost change amount so that the energy cost of the heat medium system is reduced; A control device comprising:

2. The control device according to claim 1 , wherein the predetermined value is a minimum unit set in the heat source machine for changing the temperature of the heat source machine.

3. The control device described in claim 1, wherein the specified value is small enough that the change in a first variable that determines the energy consumption of the heat source machine when the set temperature of the heat source machine is increased by the specified value can be considered equivalent to the change in the first variable when the set temperature of the heat source machine is decreased by the specified value.

4. The control device according to claim 3 , wherein the first variable is an energy consumption amount of the heat source machine or an operating frequency of the heat source machine.

5. The control device described in claim 3, wherein the specified value is small enough that the change in a second variable that determines the energy consumption of the heat transport equipment when the set temperature of the heat source machine is increased by the specified value can be equated with the change in the second variable when the set temperature of the heat source machine is decreased by the specified value.

6. The control device according to claim 5 , wherein the second variable is an operating frequency of the heat transfer equipment.

7. The control device described in claim 5, wherein the table creation unit, in creating the first table, calculates the amount of change in energy consumption of the second heat source unit based on the first variable obtained by increasing the set temperature of the heat source unit by the predetermined value, or calculates the amount of change in energy consumption of the first heat source unit based on the first variable obtained by decreasing the set temperature of the heat source unit by the predetermined value.

8. The control device described in claim 5, wherein the table creation unit, in creating the second table, calculates the amount of change in energy consumption of the second heat transport equipment based on the second variable obtained by increasing the set temperature of the heat source machine by the predetermined value, or calculates the amount of change in energy consumption of the first heat transport equipment based on the second variable obtained by decreasing the set temperature of the heat source machine by the predetermined value.

9. the heat medium system is configured so that a graph of the energy cost of the heat medium system, which is defined as a domain of the set temperature of the heat source machine, is a downward convex function; The control device described in claim 1, wherein the heat source machine control unit increases the set temperature of the heat source machine by the predetermined value when the first energy cost change amount is a negative value, and decreases the set temperature of the heat source machine by the predetermined value when the second energy cost change amount is a negative value.

10. The control device according to claim 9 , wherein the heat source machine control unit maintains the set temperature of the heat source machine when the first energy cost change amount and the second energy cost change amount are both positive values.

11. A control method for controlling a heat medium system including a heat source machine for imparting heat to a heat medium, a heat consuming facility for performing heat exchange between the heat medium and a load, and a heat transport facility for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming facility, a table creation step of creating a first table and a second table by changing the set temperature of the heat source machine by a predetermined value, the first table is a table in which a first heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine increases by the predetermined value, and a second heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat source machine; The second table is a table in which a first heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine increases by the predetermined value, and a second heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat transport equipment. The table creation step, a first heat source unit energy consumption change amount and a second heat source unit energy consumption change amount associated with the current operating state of the heat source unit in the first table; an energy consumption change acquisition step of acquiring a first heat transport facility energy consumption change amount and a second heat transport facility energy consumption change amount associated with a current operating state of the heat transport facility in the second table; an energy cost change amount calculation step of calculating a first energy cost change amount, which is the amount of change in energy cost of the heat medium system when the set temperature of the heat source machine increases by the predetermined value, based on the acquired first heat source machine energy consumption change amount and first heat transport equipment energy consumption change amount, and calculating a second energy cost change amount, which is the amount of change in energy cost of the heat medium system when the set temperature of the heat source machine decreases by the predetermined value, based on the acquired second heat source machine energy consumption change amount and second heat transport equipment energy consumption change amount; a heat source machine control step of controlling a set temperature of the heat source machine based on the first energy cost change amount and the second energy cost change amount so that the energy cost of the heat medium system is reduced; A control method comprising:

12. a heat source machine for adding heat to a heat medium, a heat consuming facility for performing heat exchange between the heat medium and a load, and a heat transport facility for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming facility; a table creation unit that creates a first table and a second table by changing the set temperature of the heat source machine by a predetermined value, the first table is a table in which a first heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine increases by the predetermined value, and a second heat source machine energy consumption change amount, which is the amount of change in the energy consumption of the heat source machine when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat source machine; The second table is a table in which a first heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine increases by the predetermined value, and a second heat transport equipment energy consumption change amount, which is the amount of change in the energy consumption of the heat transport equipment when the set temperature of the heat source machine decreases by the predetermined value, are recorded in association with each operating state of the heat transport equipment. A table creation unit; an energy consumption change amount acquisition unit that acquires a first heat source unit energy consumption change amount and a second heat source unit energy consumption change amount that are associated with the current operating state of the heat source unit in the first table, and a first heat transport equipment energy consumption change amount and a second heat transport equipment energy consumption change amount that are associated with the current operating state of the heat transport equipment in the second table; Based on the acquired first heat source unit energy consumption change amount and the first heat transport equipment energy consumption change amount, A first energy cost change amount is calculated, which is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source machine is increased by the predetermined value, and based on the acquired second heat source machine energy consumption change amount and second heat transport equipment energy consumption change amount, an energy cost change amount calculation unit that calculates a second energy cost change amount, which is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source machine is reduced by the predetermined value; a heat source machine control unit that controls a set temperature of the heat source machine based on the first energy cost change amount and the second energy cost change amount so that the energy cost of the heat medium system is reduced; A program to function as a

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