Control device, control method, and program

Abstract

A control device for a heat medium system, etc., that can easily reduce energy consumption costs is provided. [Solution] A control device comprising: a table creation unit that creates a first / second table in which the amount of energy consumption change of the heat source machine and the heat transport equipment when the set temperature of the heat source machine increases / decreases by a predetermined value by changing the set temperature of the heat source machine by a predetermined value, and records the amount of energy consumption change of each of the heat source machine and the heat transport equipment corresponding to each operating state; an energy consumption change acquisition unit; and a heat source machine control unit that controls the set temperature of the heat source machine based on the acquired amount of energy consumption change in the first heat source machine and the amount of energy consumption change in the first heat transport equipment, so as to reduce the energy cost of the heat medium system based on the first / second energy cost change amount of the heat medium system when the set temperature of the heat source machine increases / decreases by a predetermined value.

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 a target space by driving heat transport equipment such as a pump, using a heat medium 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] JP 2012-112557 A 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 such as the heat source machine, the heat transport equipment, and the load side device, for example, the increase or decrease in the set temperature of the heat source machine and the increase or decrease in the flow rate of the heat transfer medium by the heat transport equipment may have an inverse relationship. That is, in the heat transfer medium system, when the set temperature of the heat source machine increases, the flow rate of the heat transfer medium by the heat transport equipment decreases, and conversely, when the set temperature of the heat source machine decreases, the flow rate of the heat transfer medium by the heat transport equipment may be controlled to increase. In such a heat transfer medium system, in order to reduce the energy consumption cost of the entire heat transfer medium system while maintaining the function of the load side device, it is necessary to make the output balance of the heat source machine and the heat transport equipment closer to the optimum. However, since the behavior of the energy consumption of the heat source machine and the heat transport equipment varies greatly depending on the system configuration, installation environment, operating state, etc., it has been difficult to control so as to reduce the energy consumption cost 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, which 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 unit for imparting 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, the control device comprising: a table creation unit that creates a first table and a second table by changing a set temperature of the heat source unit by a predetermined value, the first table including a first heat source unit energy consumption change amount that is a change in the energy consumption of the heat source unit when the set temperature of the heat source unit is increased by the predetermined value, and a second table including a second heat source unit energy consumption change amount that is a change in the energy consumption of the heat source unit when the set temperature of the heat source unit is increased by the predetermined value. The second 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 increases 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 decreases by a predetermined value, in association with each operating state of the heat transport equipment. an energy consumption change 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 a 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 a 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 that is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source unit increases by a predetermined value based on the acquired first heat source unit energy consumption change amount and first heat transport equipment energy consumption change amount, and calculates a second energy cost change amount that is the amount of change in the energy cost of the heat medium system when the set temperature of the heat source unit decreases by a predetermined value based on the acquired second heat source unit energy consumption change amount and second heat transport equipment energy consumption change amount; and a heat source unit control unit that controls the set temperature of the heat source unit 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 decreases.

[0007] According to this aspect, in a heat medium system including a heat source machine for providing heat to a heat medium, a heat consuming equipment for performing heat exchange between the heat medium and a load, and a heat transport equipment for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming equipment, a first table is created in which the amount of change in energy consumption of the heat source machine when the set temperature of the heat source machine increases / decreases by a predetermined value is recorded in association with the operating state of the heat source machine, and a second table is created in which the amount of change in energy consumption of the heat transport equipment when the set temperature of the heat source machine increases / decreases by a predetermined value is recorded in association with the operating state of the heat transport equipment. Then, from each amount of energy consumption change, a first energy cost change amount / 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 increases / decreases by a predetermined value in the current operating state, is calculated, and the set temperature of the heat source machine is controlled based on these energy cost change amounts so that the energy cost of the heat medium system is reduced. This makes it possible to easily reduce the energy consumption cost of the heat medium system. Effect of the Invention

[0008] According to the present invention, it is possible to provide a control device for a heat medium system, which can easily reduce energy consumption costs. [Brief description 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. [Diagram 2] 1 is a schematic diagram illustrating an example of a functional configuration of a control device 100 according to an embodiment. [Diagram 3] 3 is a schematic diagram showing an example of the data structure of a heat source unit operating state table 111. FIG. [Figure 4] 3 is a schematic diagram showing an example of a data structure of a pump operation status table 112. FIG. [Diagram 5] 4 is a schematic diagram showing an example of a data structure of a heat source unit energy consumption change amount table 113. FIG. [Figure 6] 4 is a schematic diagram showing an example of a 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 related to the creation of various tables by a table creating unit 130 of the control device 100 according to the embodiment. FIG. [Figure 8] 10 is an operation flow diagram showing an example of an operation 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 PREFERRED EMBODIMENTS

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

[0011] Fig. 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. 1.

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

[0013] The cold and hot water system 1 includes, for example, a heat source unit 10, an energy consumption sensor 11, a cold and hot water outlet temperature sensor 12, a cold and 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. The chilled / hot water flows in the chilled / hot water circulation circuit from the heat source unit 10 to the air conditioner 30 as forward chilled / hot water, and flows in the chilled / hot water circulation circuit from the air conditioner 30 to the heat source unit 10 as return chilled / hot water. Note that the chilled / hot water circulation circuit may include multiple chilled / hot water circulation systems according to the installation location, etc., because the required chilled / hot water transport capacity differs depending on the installation location, etc. of the air conditioner 30.

[0015] The hot and cold water system 1 may include, for example, one or more heat source units 10. For example, under the control of a heat source unit control device (not shown), the heat source unit 10 consumes fuel (gas, etc.) or electricity to generate heat or obtains heat from outside air using an auxiliary heat source unit (not shown), and imparts the generated or obtained heat to the hot and cold water, thereby cooling or heating the hot and cold water. The heat imparted to the hot and cold water may be cold heat obtained from outside air by utilizing the properties of heat due to a change in the state of a substance, or may be hot heat generated by converting chemical energy into thermal energy by burning fuel. The heat source unit 10 may have, for example, a refrigeration cycle device (not shown) that constitutes a refrigerant circuit that circulates a refrigerant, and may cool or heat water by utilizing the refrigeration cycle.

[0016] The heat source machine 10 has, for example, a set temperature S for hot and cold water. The set temperature may include a cold 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 by a predetermined amount within a range from a minimum value to a maximum value that is specified in advance. Note that in this embodiment, the description will be given assuming that at least one heat source machine 10 included in the hot and cold water system 1 is all controlled by one common set temperature. However, at least one heat source machine 10 included in the hot and cold 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 the energy source for generating heat to be applied to the 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 forward primary header 24a, and the forward cold and hot water flowing through each pipe joins in the forward primary header 24a. The cold and hot water outlet temperature sensor 12 is provided, for example, on the individual pipes downstream of each heat source unit 10, and measures the cold and hot water outlet temperature TO. The cold and hot water outlet temperature TO may include, for example, a cold water outlet temperature TOC [°C] which is the outlet temperature of the cold water, and a hot water outlet temperature TOH [°C] which is the outlet temperature of the hot water.

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

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

[0021] The pump 20 is an example of a heat transfer facility, and has a function of consuming electricity or the like to generate power, and using the generated power to circulate cold and hot water in a cold and 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 in cold and hot water in the cold and hot water circulation circuit, applies pressure to send it out, and circulates it in the cold and 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 be provided downstream of the heat source unit 10. The heat source unit 10 has, as its specifications, a specification value (rated flow rate) of the chilled / hot water flow rate and a minimum value that is acceptable for maintenance purposes. The primary pump 21 is a pump for adjusting the chilled / hot water flow rate in the heat source unit 10 to a range, for example, 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 cause any hindrance to the operation of the air conditioner 30.

[0023] The control method of the primary pump 21 may be, for example, variable control (frequency control of the motor rotation speed by an inverter). Specifically, the primary pump 21 may be controlled by a method in which a control instruction value is calculated from the flow rate of the chilled / hot water on the load side grasped by calculation of direct measurement or indirect measurement, with the minimum value allowable for the maintenance of 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 set value of the inverter frequency is changed to adjust the flow rate of the chilled / hot water on the heat source side (primary pump flow rate). Note that, in cases where the primary pump 21 cannot be variably controlled, only when the flow rate of the chilled / hot water in the rated operation of the primary pump 21 exceeds the rated flow rate of the heat source device, the opening degree of a valve (not shown) on the discharge side of the primary pump 21a may be changed in advance to physically restrict the flow rate of the chilled / hot water on the heat source side. In this case, an adjustment operation to match the fluctuation of the flow rate of the chilled / hot water on the load side may not be performed. Note that, in cases where the chilled / hot water circulation circuit is configured to include multiple chilled / hot water circulation systems, the primary pump 21 may be controlled by the same frequency for each chilled / hot water circulation system. However, when 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 piping downstream of the outgoing 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 flow rate of the heat medium in the heat exchanger grasped by calculation of direct measurement or indirect measurement, and changing the set value of the inverter frequency to adjust the flow rate of the heat medium on the load side (secondary pump flow rate). In addition, for example, a combination of the number of operating pumps set in advance may be selected from the flow rate of the heat medium in the heat exchanger grasped by calculation of direct measurement or indirect measurement, and the number of operating secondary pumps 22 may be raised / lowered by instructing to start / stop the pumps individually, thereby adjusting the flow rate of the heat medium on the load side (flow rate of the secondary pump 22). Note that, when the cold / hot water circulation circuit is configured to include multiple cold / hot water circulation systems, the secondary pump 22 may be controlled by the same frequency for each cold / hot water circulation system. However, when secondary pumps 22 with different capacities are mixed in 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. The cold or hot water that exceeds the flow rate of the cold or hot water in the heat exchanger of the air conditioner 30 passes through the bypass valve 23 from the outlet side of the secondary pump 22 and returns to the inlet side of the secondary pump 22.

[0027] The bypass pipe 26 is a pipe that connects between the forward primary header 24a and the return header 25. The bypass pipe 26 is configured to allow the cold / hot water that is not sent to the air conditioner 30 to bypass the forward header 24 and send it to the return header 25. The bypass valve 27 is provided midway along the bypass pipe 26, and adjusts the flow rate of the cold / hot water passing through the bypass pipe 26.

[0028] The air conditioner 30 is an example of heat consuming equipment, and is a device that has a heat exchanger (not shown) for exchanging heat between air (an example of a load) and hot and cold water, and a fan (not shown) for sending air to the heat exchanger, and heats or cools the air. The hot and 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 be provided upstream of each air conditioner 30. The flow control valve 31 is connected to the heat exchanger via a pipe. The flow control valve 31 is configured to be capable of adjusting the flow rate of the cold and hot water in the heat exchanger by adjusting the opening degree 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). The opening degree of the flow control valve 31 may be controlled, for example, by calculating the 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. In addition, for example, the rotation speed of the fan may be controlled to adjust the flow rate of the air in the heat exchanger. The cold and hot water discharged from the air conditioner 30 through the flow control valve 31 flows into the return header 25 as return cold and 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 and the like 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 program 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 capable of executing at least a part of the functions of each 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 a functional configuration of the control device 100 according to the embodiment. The control device 100 has, 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 unit operation state table 111 is a table that records the operation state (heat source unit operation state) of the heat source unit 10. For example, as shown in Fig. 3, the heat source unit operation state table 111 may include the number of operating heat source units, 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 unit operation state ID that is identification information for identifying the heat source unit operation state.

[0034] The number of operating heat source machines is the number of operating heat source machines 10 among at least one heat source machine 10 included in the hot and cold water system 1. The number of operating heat source machines can be acquired, 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 hot and cold water system 1. The set temperature S may be the set temperature SC [°C] of the cold water or the set temperature SH [°C] of the hot water. The set temperature S can be acquired, for example, from a heat source machine control device (not shown). The hot and cold water outlet temperature TO is the outlet temperature [°C] of the hot and cold water detected by the hot and cold water outlet temperature sensor 12. The hot and cold water outlet temperature TO may be the hot and cold water outlet temperature TOC [°C] which is the outlet temperature of the hot water, or the hot water outlet temperature TOH [°C] which is the outlet temperature of the hot water. The hot and cold water inlet temperature TI is the inlet temperature [°C] of the hot and cold water detected by the hot and cold water inlet temperature sensor 13. The cold / hot water inlet temperature TI may be a cold water inlet temperature TIC [°C] which is the inlet temperature of cold 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 state table 112. The pump operating state table 112 is a table that records the operating states (pump operating states) of the pumps 20 (the primary pump 21 and the secondary pump 22). The pump operating state table 112 may include, for example, as shown in Fig. 4, the number of operating pumps, a pump operating frequency F, and a hot and cold water supply temperature TS, which are associated with a pump operating state ID that is identification information for identifying the pump operating state.

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

[0037] 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 amount of 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 operation state. The heat source machine energy consumption change amount table 113 may include, for example, as shown in FIG. 5, 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 amount ΔEUR when the set temperature S of the heat source machine 10 increases by a predetermined value, and a post-change heat source machine energy consumption EDR and a heat source machine energy consumption change amount ΔEDR when the set temperature S of the heat source machine 10 decreases by a predetermined value, all of which are associated with the heat source machine operation state ID.

[0038] The heat source machine operation state ID included in the heat source machine energy consumption change amount table 113 corresponds to the heat source machine operation state ID included in the heat source machine operation 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 operation state indicated by the heat source machine operation 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 the 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 the power (unit: [kW], etc.) when the energy source of the heat source machine 10 is electricity. The heat source machine energy consumption change amount ΔEDR (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 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 the second table, and is a table in which the change amount (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 unit 10 changes by a predetermined value is recorded in association with the pump operation state. The pump energy consumption change amount table 114 may include, for example, as shown in FIG. 6, a pre-change pump operation frequency FP, a pre-change pump energy consumption EP, a post-change pump operation 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 unit 10 increases by a predetermined value, which are associated with the pump operation state ID.

[0042] The pump operating state IDs included in the pump energy consumption change 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 hot and cold 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 changed pump operation frequency FUP is the operation frequency of each pump 20 in the pump operation state after the set temperature S of the heat source unit 10 has increased by a predetermined value. The changed pump energy consumption EUP is the sum of the energy consumption of each pump 20 in the pump operation state after the set temperature S of the heat source unit 10 has increased by a predetermined value. In particular, when the pumps 20 are controlled at the same operation frequency F for each hot and cold water system, the changed pump energy consumption EUP may be defined as the sum of the energy consumption of the pumps 20 for each system. The changed pump energy consumption EUP may be defined as power (unit: [kW], etc.). The pump energy consumption change amount ΔEUP (an example of a second energy consumption change amount) is the difference between the pump energy consumption amount EP before the change and the pump energy consumption amount EUP after the change, i.e., EUP-EP.

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

[0045] 2, a description will be given of 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, for example, a heat source machine operation state table 111, a pump operation state 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 state 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 acquisition unit 131 may acquire, for example, information indicating the operating state of the heat source unit 10 (heat source unit operating state information) and record it in the heat source unit operating state table 111. The operating state information acquisition unit 131 may acquire, for example, information indicating whether the heat source unit 10 is operating or not from a heat source unit control device (not shown). The operating state information acquisition unit 131 may acquire the number of operating heat source units 10 by aggregating the information and calculating the number of operating heat source units 10 in the hot and cold water system 1. The operating state information acquisition unit 131 may acquire, for example, a set temperature S of the heat source unit 10 from a heat source unit control device (not shown). The operating state information acquisition unit 131 may acquire, for example, a cold or hot water outlet temperature TO (a cold water outlet temperature TOC [°C] which is the outlet temperature of cold water, or a hot water outlet temperature TOH [°C] which is the outlet temperature of hot water) from the cold or hot water outlet temperature sensor 12. The operating state information acquisition unit 131 may acquire, for example, a cold / hot water inlet temperature TI (a cold water inlet temperature TIC [°C] which is the inlet temperature of cold water, or a hot water inlet temperature TIH [°C] which is the inlet temperature of hot water) from the cold / hot water inlet temperature sensor 13. The operating state information acquisition unit 131 may acquire, for example, information indicating the operating state of the pump 20 (pump operating state information) and record it in the pump operating state table 112. The operating state information acquisition unit 131 may acquire, for example, information indicating whether the pump 20 is operating or not from a pump control device (not shown). The operating state information acquisition unit 131 may acquire the number of operating pumps 20 in the cold / hot water system 1 by aggregating the information and calculating the number of operating pumps 20. The operating state information acquisition unit 131 may acquire, for example, an operating frequency F [Hz] of the pump 20 operating in the cold / hot water system 1 from a pump control device (not shown). The operation 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 operation frequencies F of the pumps 20 (the primary pump 21 and the secondary pump 22) belonging to the same hot and cold water circulation system may be the same.

[0048] The energy consumption acquisition unit 132 acquires, for example, the heat source machine energy consumption ER (the sum of the amounts consumed per unit time of the energy sources for generating heat to be applied to the cold or hot water in all the heat source machines 10 operating in the cold or hot water system 1) and records it in the heat source machine energy consumption change table 113 in association with the heat source machine operation state ID. For example, when the heat source machine 10 is of 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, when the heat source machine 10 is of 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 unit energy consumption ER [kW] = Heat source unit rated power consumption [kW] * (heat source unit operating frequency [Hz] / heat source unit 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 in all pumps 20 operating in the chilled / hot 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 calculate the pump energy consumption EP based on the following formula, for example. 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 change (increase or decrease) the set temperature S of the heat source machine 10 by a predetermined value, for example. The predetermined value may be, for example, 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 regarded as 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 when the heat source machine 10 is an electric type.

[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 regarded as 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, a "heat source machine energy consumption change ΔEUR" when "the set temperature S is increased by a predetermined value" and a "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, a "pump energy consumption change ΔEUP" when "the set temperature S is increased by a predetermined value" and a "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 performs a determination regarding the operating state 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 a 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 135 may determine whether the set temperature S of the heat source machine 10 is not a 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 135 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 135 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.

[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 hot and cold 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 unit 10, and then refers to the heat source unit operating state table 111 to determine the current operating state of the heat source unit 10. Specifically, for example, the operating state determination unit 141 acquires the number of operating heat source units and the set temperature S from a heat source unit 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 unit operating state table 111 and determines the operating state corresponding to the acquired information (the number of operating heat source units, the set temperature S, the chilled / hot water outlet temperature TO, the chilled / hot water inlet temperature TI) (including the case where the error is within a predetermined range) as the current operating state of the heat source unit 10.

[0057] The operating state determination unit 141, for example, acquires various parameters of the pump 20 and then refers to the pump operating state table 112 to determine the current operating state of the pump 20. Specifically, for example, the operating state determination unit 141 acquires from each pump 20 whether it is operating or not, and calculates the number of operating pumps 20 as the number of operating pumps. In addition, the operating state determination unit 141 acquires the pump operation 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 (the number of operating pumps, the 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 cold / 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 cold / 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 unit energy cost change amount ΔCUR and the pump energy cost change amount ΔCUP. Here, the heat source unit energy cost change amount ΔCUR is the amount of change in energy cost equivalent to the heat source unit energy consumption change amount ΔEUR when the set temperature S of the heat source unit 10 increases by a predetermined value. Also, 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 unit 10 increases by a predetermined value. In particular, when the pump 20 is controlled at the same operating frequency F for each hot and cold water system, the pump energy cost change amount ΔCUP may be defined as the sum of the pump energy cost change amounts for each system.

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

[0061] Each energy cost change amount (heat source machine energy cost change amount ΔCUR, ΔCDR, pump energy cost change amount ΔCUP, ΔCDP) is calculated by multiplying each energy consumption change amount by the cost of the energy source. The cost unit price of the energy source of the heat source machine 10 may be the cost unit price of the gas (unit: [yen / m^3], etc.) when the energy source of the heat source machine 10 is gas, or may be the cost unit price of the electricity (unit: [yen / kW], etc.) when the energy source of the heat source machine 10 is electricity. The cost unit price of the energy source of the pump 20 may be the cost unit price of the electricity (unit: [yen / kW], etc.) when the energy source of the pump 20 is electricity. These cost unit 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 cold / hot water system 1 based on an energy cost change amount ΔCUS, which is the amount of change in the energy cost of the cold / 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 cold / hot water system 1 when the set temperature S of the heat source machine 10 decreases by a predetermined value. Specifically, the heat source machine control unit 143 may, for example, cause the heat source machine 10 to increase the set temperature S of the heat source machine 10 by a predetermined value when the energy cost change amount ΔCUS, which is the amount of change in the energy cost of the cold / hot water system 1 when the set temperature S of the heat source machine 10 increases by a predetermined value, is smaller than zero. Furthermore, for example, when 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 10 may reduce the set temperature S of the heat source machine 10 by a predetermined value. Furthermore, for example, when 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] The determination unit 144, for example, performs a determination regarding the operating state 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 a maximum value in order to check whether the set temperature S of the heat source machine 10 can be controlled to be increased. For example, the determination unit 144 may determine whether the set temperature S of the heat source machine 10 is not a minimum value in order to check whether the set temperature S of the heat source machine 10 can be controlled to be decreased. 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 related to the creation of various tables by the table creating unit 130 of the control device 100 according to the embodiment. In the following, the heat source unit 10 will be described as being of a fuel combustion type.

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

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

[0067] (S103) The operation status information acquisition unit 131 acquires heat source machine operation status information indicating the operation status of the heat source machine 10, and records the information in the heat source machine operation status table 111 in association with the heat source machine operation status ID. Specifically, the operation status 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 the heat source machine operation status table 111 in association with the heat source machine operation status ID. The operation 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 the heat source machine operation status table 111 in association with the heat source machine operation status 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 operation 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 operation 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 the pump operating state table 112 in association with the 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 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 a pump operating frequency F from a pump control device (not shown), and acquires a cold / hot water supply temperature TS from the supply temperature sensor 14, and 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 the pump energy consumption change table 114 in association with the pump operating state ID of step S105. 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, and records it in the pump energy consumption change table 114 in association with the pump operating state ID of step 105. 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 for changing the temperature of the heat source machine 10, which is set in the heat source machine 10. In this case, the smallest unit (predetermined value) is small enough to be able to equate 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 with 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 to be able to equate 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 with 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 after change EUR" when "the set temperature S is increased by a predetermined value" and the "heat source machine energy consumption after change EDR" 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 operation 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 after change EUR" when "the set temperature S is increased by a predetermined value". As described above, the predetermined value in step S107 is small enough that the amount of change in 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 regarded as 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. 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 after change EDR" 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 it 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 change" in the heat source machine energy consumption change table 113 and the "heat source machine energy consumption EUR after 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. In addition, the energy consumption change calculation unit 134 calculates the difference between the “heat source unit energy consumption ER before change” in the heat source unit energy consumption change table 113 and the “heat source unit energy consumption EDR after change” when “the set temperature S is reduced by a predetermined value”, i.e., EDR-ER, as the “heat source unit energy consumption change ΔEDR” and records it in the heat source unit 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 operation state ID of step S106. Specifically, the energy consumption acquisition unit 132 acquires the pump operation frequency F, and then calculates the "post-change pump energy consumption EUP" when "the set temperature S is increased by a predetermined value" based on the following formula, using this as the "post-change pump operation frequency FUP" when "the set temperature S is increased by a predetermined value", and records it in the pump energy consumption change table 114. Changed pump energy consumption EUP [kW] = Pump rated power consumption [kW] * (changed pump operating frequency FUP [Hz] / Pump rated frequency [Hz])^3

[0075] 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 unit 10 is increased by the predetermined value can be regarded as 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 unit 10 is decreased by the predetermined value. Based on this, the energy consumption acquisition unit 132 calculates the "changed 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 "changed 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 table 114. Changed pump energy consumption EDP [kW] = Pump rated power consumption [kW] * (changed 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 them 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 it 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 it in the pump energy consumption change table 114. Next, the process returns to step S101.

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

[0078] (S112) The determination unit 135 determines whether or not 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 process 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 operation status information acquisition unit 131 acquires heat source machine operation status information indicating the operation status of the heat source machine 10, and records the information in the heat source machine operation status table 111 in association with the heat source machine operation status ID. Specifically, the operation 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 operation status ID in the heat source machine operation status table 111. The operation 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 the heat source machine operation status table 111 in association with the heat source machine operation status ID.

[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 operation 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 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 operation 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 a pump operating frequency F from a pump control device (not shown), and acquires a cold / hot water supply temperature TS from the supply 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, and records it 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 unit control unit 133 reduces the set temperature S of the heat source unit 10 by a predetermined value in step S107.

[0085] (S119) The energy consumption acquisition unit 132 acquires the "heat source machine energy consumption after change EDR" when "the set temperature S is reduced by a predetermined value" and the "heat source machine energy consumption after change EUR" 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 operation 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 after change EDR" when "the set temperature S is reduced by a predetermined value". As described above, the amount of change in the 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 regarded as 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 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 after change EUR" 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 reduced 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 it 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 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. In addition, the energy consumption change calculation unit 134 calculates the difference between the “heat source unit energy consumption ER before the change” in the heat source unit energy consumption change table 113 and the “heat source unit 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 unit energy consumption change ΔEUR” and records it in the heat source unit 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 operation state ID of step S117. Specifically, the energy consumption acquisition unit 132 acquires the pump operation frequency F, and then calculates the "post-change pump energy consumption EDP" when "the set temperature S is decreased by a predetermined value" based on the following formula, using this as the "post-change pump operation frequency FDP" when "the set temperature S is decreased by a predetermined value", and records it in the pump energy consumption change table 114. Changed pump energy consumption EDP [kW] = Pump rated power consumption [kW] * (changed pump operating frequency FDP [Hz] / Pump rated frequency [Hz])3

[0088] 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 unit 10 is increased by the predetermined value can be regarded as 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 unit 10 is decreased by the predetermined value. Based on this, the energy consumption acquisition unit 132 calculates the "changed 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 "changed 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. Pump energy consumption after change EUP [kW] = Pump rated power consumption [kW] * (Pump operating frequency after change 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 them 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 it 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 unit is at 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 becomes 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, operating state, etc., related to the chilled / hot water system 1.

[0092] 8 is an operation flow diagram showing an example of operation processing related to operation balance control by the operation balance control unit 140 of the control device 100 according to the embodiment. Note that, 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 downwardly convex function.

[0093] (S201) The operation state determination unit 141 determines the current heat source unit operation state of the heat source unit 10. Specifically, the operation state determination unit 141 acquires the number of operating heat source units and the set temperature S from a heat source unit 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 unit operation state table 111 to determine the heat source unit operation 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) and acquires the cold / 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 cold / 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" when the set temperature S of the heat source machine is increased by a predetermined value, which corresponds to the heat source machine operation state determined in step S201, from the heat source machine energy consumption change amount table 113, and calculates the value obtained by multiplying this by the cost unit price of the energy source of the heat source machine 10 as 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. In addition, the energy cost change calculation unit 142 obtains 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 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 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 10 is increased by a predetermined value, which corresponds to the pump operation state determined in step S202, from the pump energy consumption change amount table 114, and calculates the value obtained by multiplying this by the unit cost of the energy source of the pump 20 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 unit 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 as the pump energy cost change ΔCDP when the set temperature S of the heat source unit 10 is reduced by a predetermined value.

[0097] (S205) The energy cost change amount calculation unit 142 calculates an energy cost change amount ΔCUS, 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 increased by a predetermined value, and an 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 decreased by a predetermined value. Specifically, the energy cost change amount 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 hot and cold 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 amount 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 hot and cold 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 process returns to step S201.

[0099] (S207) If the energy cost change amount ΔCUS of the hot and cold water system 1 when the set temperature S of the heat source unit 10 is increased by a predetermined value is less than zero (ΔCUS<0), the judgment unit 144 judges whether the set temperature S of the heat source unit 10 is not the maximum value or the pump 20 is not in the minimum operating state. If the judgment result of step S207 is negative (S207; No) (if the set temperature S of the heat source unit 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 unit 10 is not the maximum value and the pump 20 is not in the minimum operating state), the heat source unit control unit 143 increases the set temperature of the heat source unit 10 by a predetermined value. The 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 hot and cold water system 1 when the set temperature S of the heat source unit 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 unit 10 is not at the minimum value or 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 unit 10 is at 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 positive (S209; Yes) (the set temperature of the heat source unit 10 is not the minimum value and the pump 20 is not in a maximum operating state), the heat source unit control unit 143 reduces the set temperature of the heat source unit 10 by a predetermined value. The 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 continually adjusted in a direction that reduces the energy cost of the chilled / hot water system 1 overall based on 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 unit 10 increases by a predetermined value, and the 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 unit 10 decreases by a predetermined value, so that the energy cost of the chilled / hot water system 1 can be continuously reduced.

[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 arrangements, materials, conditions, shapes, sizes, etc., are not limited to those shown as examples and can be changed as appropriate. In addition, configurations shown in different embodiments can be partially substituted or combined with each other. [Explanation of symbols]

[0105] 1... cold / hot water system, 10... heat source unit, 11... energy consumption sensor, 12... cold / hot water outlet temperature sensor, 13... cold / hot water inlet temperature sensor, 14... forward temperature sensor, 20... pump, 21... primary pump, 22... secondary pump, 23... bypass valve, 24a... forward primary header, 24b... forward 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 unit operation Operation status table, 112...pump operation status table, 113...heat source unit energy consumption change table, 114...pump energy consumption change table, 120...processing unit, 130...table creation unit, 131...operation status information acquisition unit, 132...energy consumption acquisition unit, 133...heat source unit control unit, 134...energy consumption change calculation unit, 140...operation status determination unit, 142...energy cost change calculation unit, 143...heat source unit control unit, 144...determination unit

Claims

1. A control device for controlling a heat medium system including a heat source device for imparting heat to a heat medium, a heat consuming device for performing heat exchange between the heat medium and a load, and a heat transport device for transporting the heat medium so that the heat medium circulates between the heat source device and the heat consuming device, A table creation unit that creates a first table and a second table by changing the set temperature of the heat source unit by a predetermined value, the first table is a table in which a first heat source unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is increased by the predetermined value, and a second heat source unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is decreased by the predetermined value, are recorded in association with each operating state of the heat source unit; 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 the 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 the 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 unit control unit that controls a set temperature of the heat source unit 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 unit for changing a temperature of the heat source unit.

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

5. The control device described in claim 3, wherein the specified value is small enough that the amount of 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 considered equivalent to the amount of 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 transport facility.

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 specified 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 specified 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 specified 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 specified value.

9. the heat medium system is configured such that a graph of the energy cost of the heat medium system, the domain of which is a set temperature of the heat source unit, is a downward convex function; The control device according to claim 1, wherein the heat source unit control unit increases the set temperature of the heat source unit by the specified value when the first energy cost change amount is a negative value, and decreases the set temperature of the heat source unit by the specified value when the second energy cost change amount is a negative value.

10. The control device according to claim 9 , wherein the heat source unit control unit maintains the set temperature of the heat source unit 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 equipment for performing heat exchange between the heat medium and a load, and a heat transport equipment for transporting the heat medium so that the heat medium circulates between the heat source machine and the heat consuming equipment, 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 unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is increased by the predetermined value, and a second heat source unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is decreased by the predetermined value, are recorded in association with each operating state of the heat source unit; 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 the 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 the 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 unit control step of controlling a set temperature of the heat source unit 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 computer for controlling a heat medium system including a heat source device for imparting heat to a heat medium, a heat consuming device for performing heat exchange between the heat medium and a load, and a heat transport device for transporting the heat medium so that the heat medium circulates between the heat source device and the heat consuming device, A table creation unit that creates a first table and a second table by changing the set temperature of the heat source unit by a predetermined value, the first table is a table in which a first heat source unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is increased by the predetermined value, and a second heat source unit energy consumption change amount, which is the amount of change in the energy consumption of the heat source unit when the set temperature of the heat source unit is decreased by the predetermined value, are recorded in association with each operating state of the heat source unit; 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, which is the change in the energy cost of the heat medium system when the set temperature of the heat source unit is increased by the predetermined value, is calculated, and based on the acquired second heat source unit 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 an amount of change in the energy cost of the heat medium system when the set temperature of the heat source unit is reduced by the predetermined value; a heat source unit control unit that controls a set temperature of the heat source unit 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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