JP6986833B2 - Cold / hot water supply system - Google Patents

Description

The present invention relates to a cold / hot water supply system including a plurality of heat source machines and supplying cold water and hot water to an air conditioner.

Various studies have been made on a cold / hot water supply system that is equipped with a plurality of heat source machines and supplies cold water and hot water to an air conditioner in order to save energy.

For example, the method for controlling the number of heat source machines disclosed in Patent Document 1 uses waste heat hot water and fuel of CGS (cogeneration system) or waste heat utilization heat source machine using waste hot water and steam of CGS as a drive source. It is related to the method of controlling the number of heat sources of the cold / hot water supply system including, and the start priority is set in advance for each heat source machine. This is a control method in which different start-up priorities are set, and the start-up and stop of each heat source machine are controlled according to the start-up priority according to the cooling load and the heating load states. In addition, when operating the CGS waste heat hot water of the waste heat utilization heat source machine, it is determined whether or not there is the minimum amount of heat and temperature required for operation in order from the one with the highest start priority, and the number of units is determined based on the determination result. It is a control method characterized by incorporating or excluding it into control.

Japanese Unexamined Patent Publication No. 2014-43954

However, in the prior art described in Patent Document 1, there is no special device regarding the method for determining the increase or decrease in the number of operating heat source machines, and the load factor (preset) is set as in the generally practiced method. It is a control method that increases or decreases the number of heat source machines in operation based on the ratio of the operating output to the rated output). Therefore, in order for the waste heat utilization heat source machine that has been started by satisfying the operating conditions to reach the preset load factor, the drive source may be insufficient only with the waste heat of CGS, and in this case, fuel or steam is added. It is thrown in. From the viewpoint of energy saving, the heat source machine targeted for the next generation should be operated before additional fuel or steam is added.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cold / hot water supply system capable of further energy saving.

The cold / hot water supply system according to the first aspect of the present invention includes a heat source machine using electricity as a drive source, a heat source machine using gas as a drive source, a heat source machine using hot water as a drive source, and a heat source machine using steam as a drive source. It includes a plurality of heat source machines that are either hot water and gas-driven heat source machines and hot water and steam-driven heat source machines, and cool water to the cooling air conditioner with at least one of energy consumption and waste heat utilization. A plurality of heat source machines on the cooling side to be supplied, a heat source machine that uses electricity as a drive source, a heat source machine that uses gas as a drive source, a heat exchanger that uses hot water as a drive source, or a heat exchanger that uses steam as a drive source. A plurality of heat source machines on the heating side that include a plurality of heat source machines and supply hot water to the heating air conditioner with at least one of energy consumption and waste heat utilization, and the required heat quantity of the cooling air conditioner and the heating air conditioner. And a plurality of selection modes in which all combinations of one or a plurality of heat source machines on the cooling side are selected each time the measurement unit for measuring the required flow rate and the measurement result of the measurement unit are obtained. A plurality of selection modes in which the total output and total flow rate of the heat source machine in each selection mode satisfy the required heat amount and required flow rate of the cooling air conditioner are extracted, and one or more heat sources among the plurality of heat source machines on the heating side are extracted. Selection mode extraction unit that extracts a plurality of selection modes in which the total output and total flow rate of the heat source machine in each selection mode satisfy the conditions of the required heat quantity and the required flow rate of the heating / air conditioner from the plurality of selection modes in which all combinations of the machines are selected. And, at least one of the energy consumption amount and the waste heat utilization amount of the heat source machine is calculated for each of the plurality of selection modes of the heat source machine on the cooling side extracted by the selection mode extraction unit, and the selection mode extraction unit is used. A calculation unit that calculates at least one of the energy consumption amount and the waste heat utilization amount of the heat source machine for each of the plurality of selection modes of the heat source machine on the heating side extracted above, and the plurality of units based on the calculation result of the calculation unit. The combination of the cooling side heat source machine and the heating side heat source machine that consumes the least amount of energy from the cooling side heat source machine and the plurality of heating side heat source machines, or the cooling side heat source that consumes the most waste heat. The operation mode of the selection unit that selects the combination of the machine and the heat source machine on the heating side and the operation mode of the heat source machine selected by the selection unit are determined by the load factor, which is the ratio of the operation output to the rated output of the heat source machine, on the cooling side and heating. A plurality of heat source machines within a range satisfying the required heat amount and the required flow rate each time the measuring unit obtains the measurement results of the required heat amount and the required flow rate, including an execution unit for executing the operation of the heat source machine on the side. The operation combination mode of the above Determine the load factor of each heat source machine by selecting the combination of the load factor, which is the ratio of the operating output to the rated output of the heat source machine.

The cold / hot water supply system according to the second aspect of the present invention is the one or a plurality of generators that generate at least one of hot water and steam in the cold / hot water supply system according to the first aspect of the present invention, and the one or more generators. One or more of the above, as long as the total value of the generated power of the generator is equal to or less than the value obtained by subtracting the minimum power purchase amount of the building from the power load of the building in which the cooling air conditioner and the heating air conditioner are installed. The generator is further provided with an operation variation extraction unit that extracts a plurality of operation variations of the generator that can be operated, and the plurality of cooling side heat source machines and the plurality of heating side heat source machines are one or more. The calculation unit includes a heat source machine whose drive source is at least one of hot water and steam generated by a generator, and the calculation unit is used in the selection mode extraction unit for a plurality of operation variations extracted by the operation variation extraction unit. At least one of the energy consumption amount and the waste heat utilization amount is calculated for a plurality of cases obtained by multiplying the extracted plurality of selection modes, and the selection unit calculates the plurality of cases based on the calculation result of the calculation unit. From the case, the operating variation of the generator with the lowest energy consumption and the combination of the heat source machine on the cooling side and the heat source machine on the heating side, or the operating variation of the generator with the highest waste heat utilization and the heat source machine on the cooling side. The combination of the generator and the heat source unit on the heating side is selected, and the execution unit executes the operation of the generator according to the operation variation of the generator selected by the selection unit, and is selected by the selection unit. By combining the heat source machine on the cooling side and the heat source machine on the heating side, the operation of the heat source machine on the cooling side and the heat source machine on the heating side is executed.

According to the present invention, further energy saving can be achieved.

It is an overall block diagram of the cold / hot water supply system which concerns on one Embodiment of this invention. It is a block diagram which shows the electric structure of the cold / hot water supply system shown in FIG. It is a flowchart which shows the flow of the process of steps S1 to S10 executed by the control apparatus shown in FIG. It is a flowchart which shows the more specific process flow of step S3 shown in FIG. 3A. It is a flowchart which shows the more specific process flow of step S4 shown in FIG. 3A. It is a flowchart which shows the more specific processing flow of step S6 shown in FIG. 3A. It is a flowchart which shows the more specific processing flow of step S7 shown in FIG. 3A. It is a flowchart which shows the more specific process flow of step S8 shown in FIG. 3A. It is a figure which shows an example of a concrete numerical value such as a calculation condition. It is a figure which shows an example of a concrete numerical value such as a calculation condition. It is a figure which shows an example of a concrete numerical value such as a measurement data. It is a figure which shows an example of the calculation result of the power generation power and waste heat production amount of CGS when the CGS is operated to 0 unit. It is a figure which shows an example of the calculation result of the power generation power and waste heat production amount of CGS when one CGS is operated. It is a figure which shows an example of the calculation result of the power generation power and waste heat production amount of CGS when two CGS are operated. It is a figure which shows an example of the calculation result of the power generation power of CGS and the waste heat production amount in the case of a constant control operation of received power. It is a figure which shows an example of the calculation result of the total output and the total flow rate of the heat source machine on the cooling side. It is a figure which shows an example of the calculation result of the total output and the total flow rate of the heat source machine on the heating side. It is a figure which shows an example of the grouping of the heat source machine on the cooling side. It is a figure which shows an example of the grouping of a heat source machine on a heating side. It is a figure which shows an example of the combination table of the inverter frequency of the primary pump on a cooling side. It is a figure which shows an example of extracting the combination which satisfies the condition of the required flow rate with the calculation result of the total flow rate of the primary pump on a cooling side. It is a figure which shows an example of the calculation result of the chilled water production amount of the heat source machine of each group which satisfies the requirement heat quantity condition about the combination of the inverter frequency of the primary pump on a cooling side. It is a figure which shows an example which extracts the combination of the inverter frequency of the primary pump of the cooling side, the cold water production amount of the heat source machine of each group is less than the rated output. It is a figure which shows an example which extracts the selection mode which simultaneously satisfies the required heat quantity and the required flow rate conditions for the flow rate of the primary pump on a cooling side. It is a figure which shows an example of the combination table of the inverter frequency of the primary pump on a cooling side. It is a figure which shows the calculation result of the total flow rate of the primary pump on a cooling side, and another example which extracts the combination which satisfies the condition of a required flow rate. It is a figure which shows another example of the calculation result of the chilled water production amount of the heat source machine of each group which satisfies the requirement heat quantity condition about the combination of the inverter frequency of the primary pump on a cooling side. It is a figure which shows another example which extracts the combination of the inverter frequency of the primary pump of the cooling side, the cold water production amount of the heat source machine of each group is less than the rated output. It is a figure which shows another example which extracts the selection mode which simultaneously satisfies the required heat quantity and the required flow rate conditions for the flow rate of the primary pump on a cooling side. It is a figure which shows an example of the aggregation result of the equipment operation state in a heat source machine on a heating side. It is a figure which shows an example of the total result of the waste heat utilization amount and the energy consumption amount of a heat source machine on a heating side. It is a figure which shows an example of the aggregation result of the equipment operation status in a heat source machine on a cooling side. It is a figure which shows an example of the total result of the waste heat utilization amount and the energy consumption amount of a heat source machine on a cooling side. It is a figure which shows an example of the total result which summarized the equipment operation state of the heat source machine of a heating side and the heat source machine of a cooling side. It is a figure which shows an example of the aggregation result which summarized the waste heat utilization amount and the energy consumption amount of the heat source machine on a heating side and the heat source machine on a cooling side. It is a figure which shows another example of the aggregation result of the equipment operation state in the heat source machine on a heating side. It is a figure which shows another example of the aggregation result of the waste heat utilization amount and the energy consumption amount of a heat source machine on a heating side. It is a figure which shows another example of the aggregation result of the equipment operation state in a heat source machine on a cooling side. It is a figure which shows another example of the aggregation result of the waste heat utilization amount and the energy consumption amount of a heat source machine on a cooling side. It is a figure which shows another example of the total result which summarized the equipment operation state of the heat source machine of a heating side and the heat source machine of a cooling side. It is a figure which shows another example of the aggregation result which summarized the waste heat utilization amount and the energy consumption amount of the heat source machine on a heating side and the heat source machine on a cooling side. It is a figure which shows an example of the calculation result of the flow rate and output of a heat source machine for the case of the first group among all the cases which multiplied the plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the waste heat production amount, utilization amount, and energy consumption amount about the case of the first group among all the cases which multiplied the plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the flow rate and output of a heat source machine for the case of the 2nd group among all the cases which multiplied a plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the waste heat production amount / utilization amount and energy consumption amount about the case of the 2nd group among all the cases which multiplied the plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the flow rate and output of a heat source machine for the case of the 3rd group among all the cases which multiplied a plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the waste heat production amount / utilization amount and energy consumption amount about the case of the 3rd group among all the cases which multiplied the plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the flow rate and output of a heat source machine for the 4th group case among all the cases which multiplied a plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the calculation result of the waste heat production amount / utilization amount and energy consumption amount about the case of the 4th group among all the cases which multiplied the plurality of operation variations of CGS and a plurality of selection modes of a heat source machine. It is a figure which shows an example of the optimal solution extracted from a plurality of cases.

First, the configuration of the cold / hot water supply system S according to the embodiment of the present invention will be described.

As shown in FIG. 1, the cold / hot water supply system S according to the embodiment of the present invention is applied to the building in which the cooling air conditioner 11 and the heating air conditioner 12 are installed, and the waste heat supply system 20 and the waste heat supply system 20 are used. It includes a cold water production system 30, a hot water production system 40, and a control device 50.

The waste heat supply system 20 has two CGS (cogeneration system) 21 and a steam boiler 22. The two CGS21s (CGS No. 1 and No. 2) have the same configuration. In the present embodiment, as an example, the number of CGS is two, but the number of CGS may be three or more. The two CGS21s are an example of the "generator" in the present invention. As the CGS capable of generating hot water, for example, a gas engine, a fuel cell or the like can be applied, and as the CGS capable of generating steam, for example, a gas engine, a gas turbine, a fuel cell or the like can be applied. The two CGS 21 and the steam boiler 22 are driven by a gas such as city gas. The two CGS 21s generate electricity by driving and generate (discharge) steam and hot water with the power generation, and the steam boiler 22 generates (discharges) steam by driving.

The cold water production system 30 has two steam generators 31 and a turbo chiller 32 as an example of a plurality of heat source machines on the cooling side. The two steam Genelink 31 (steam Genelink Units 1 and 2) have the same configuration. In the present embodiment, as an example, the number of steam genelinks is two, but the number of steam genelinks may be three or more.

The hot water production system 40 has a steam-hot water heat exchanger 41 and a hot water-hot water heat exchanger 42 as an example of a plurality of heat source machines on the heating side. The steam-hot water heat exchanger 41 exchanges heat between the steam supplied through the steam circulation circuit 23 described later and the hot water circulating in the hot water supply circuit 70. The hot water-hot water heat exchanger 42 exchanges heat between the hot water supplied through the hot water circulation circuit 24 described later and the hot water circulating in the hot water supply circuit 70.

The two steam Genelink 31 and the steam-hot water heat exchanger 41 are connected in parallel to the two CGS 21 and the steam boiler 22 via the steam circulation circuit 23. Further, the two steam genelinks 31 are connected in parallel to the two CGS 21 via the hot water circulation circuit 24. The hot water-hot water heat exchanger 42 is connected in series between the two steam genelinks 31 and the two CGS 21s in the hot water circulation circuit 24.

The two steam generators 31 and the turbo chiller 32 are connected in parallel to the cooling air conditioner 11 via the cold water supply circuit 60. In FIG. 1, for convenience, a plurality of cooling air conditioners are collectively shown as one cooling air conditioner 11. In the cold water supply circuit 60, the cold water forward header 61 is connected to the outgoing pipe to the cooling air conditioner 11, and the cold water return header 62 is connected to the return pipe to the cooling air conditioner 11. The cold water forward header 61 and the cold water return header 62 are connected by a cold water bypass pipe 63.

The steam-hot water heat exchanger 41 and the hot water-hot water heat exchanger 42 are connected in parallel to the heating air conditioner 12 via the hot water supply circuit 70. In FIG. 1, for convenience, a plurality of heating air conditioners are collectively shown as one heating / air conditioner 12. In the hot water supply circuit 70, the hot water outgoing header 71 is connected to the outgoing pipe to the heating / air conditioner 12, and the hot water returning header 72 is connected to the return pipe to the heating / air conditioner 12. The hot water going header 71 and the hot water returning header 72 are connected by a hot water bypass pipe 73.

A hot water circulation pump 25 is connected to each return pipe to each CGS 21 in the hot water circulation circuit 24. Further, in the cold water supply circuit 60, a primary pump 81 is connected to the return pipe to each steam generlink 31, and a primary pump 82 is provided to the return pipe to the turbo chiller 32. Similarly, in the hot water supply circuit 70, the return pipe to the steam-hot water heat exchanger 41 is provided with a primary pump 91, and the return pipe to the hot water-hot water heat exchanger 42 is provided with a primary pump 92. ing. Further, a secondary pump 83 is provided in the outgoing pipe to the cooling air conditioner 11, and a secondary pump 93 is provided in the outgoing pipe to the heating air conditioner 12.

The primary pumps 81 and 82 described above are controlled by the inverters 101 and 102, respectively, and the primary pumps 91 and 92 are controlled by the inverters 111 and 112, respectively. Further, the above-mentioned secondary pumps 83 and 93 are controlled by the inverters 103 and 113, respectively.
By increasing or decreasing the frequency of the inverter, the rotation speeds of the primary pump and the secondary pump, and by extension, the flow rates of the primary pump and the secondary pump are increased or decreased. The inverter is controlled by an inverter control signal output from the control device 50 described later. The primary pumps 81, 82 and the primary pumps 91, 92 are examples of the "pump" in the present invention.

A cooling tower 33 is connected to each of the two steam generators 31 via a cooling water circulation circuit, and a cooling tower 34 is connected to the turbo chiller 32 via a cooling water circulation circuit. Cooling water pumps 35 and 36 are provided in each of these cooling water circulation circuits, respectively. Further, a cooling tower 26 is connected to each of the two CGS 21 via a cooling water circulation circuit. A cooling water pump 27 is provided in each of these cooling water circulation circuits. These cooling water pumps 27, 35, 36 are controlled by the control device 50 by a conventionally known method.

The control device 50 is realized by, for example, an information processing device such as a control panel or a personal computer. The control device 50 (computer) has an arithmetic unit such as a CPU and a storage device such as a memory. As shown in FIG. 2, the control device 50 has an operation variation extraction unit 51, a first selection mode extraction unit 52, a second selection mode extraction unit 53, a combination extraction unit 54, a calculation unit 55, and a selection unit. It has 56 and an execution unit 57. The operation variation extraction unit 51, the first selection mode extraction unit 52, the second selection mode extraction unit 53, the combination extraction unit 54, the calculation unit 55, the selection unit 56, and the execution unit 57 are the arithmetic units of the control device 50. It is configured by executing the processing of each step described later.

That is, the arithmetic unit of the control device 50 executes the process of step S3 to configure the operation variation extraction unit 51, and the arithmetic unit of the control device 50 executes the process of step S4 to form the first selection mode extraction unit 52. Is configured, and the arithmetic unit of the control device 50 executes the process of step S5 to form the second selection mode extraction unit 53. Further, the arithmetic unit of the control device 50 executes the process of step S6 to configure the combination extraction unit 54, and the arithmetic unit of the control device 50 executes the process of step S7 to configure the arithmetic unit 55. Further, the arithmetic unit of the control device 50 executes the process of step S8 to configure the selection unit 56, and the arithmetic unit of the control device 50 executes the process of step S10 to configure the execution unit 57. The first selection mode extraction unit 52 is an example of the “selection mode extraction unit” in the present invention.

Further, the input unit 121 and the measurement unit 122 are connected to the control device 50. The input unit 121 includes, for example, a keyboard, a data receiving device for receiving data transmitted online, and the like. Calculation conditions are input to the input unit 121, and the calculation conditions input to the input unit 121 are output to the control device 50. The measurement unit 122 is composed of various sensors, measures predetermined measurement data, and transmits the measurement data to the control device 50.

Next, a cooling water supply method by the cold / hot water supply system S according to the embodiment of the present invention will be described.

In the following description, FIGS. 1 and 2 will be referred to as appropriate for each component of the hot / cold water supply system S. Further, in the following description, the reference numerals of the respective components are omitted.

The cold / hot water supply method (operation method of the cold / hot water supply system) according to the embodiment of the present invention is realized by the control device executing steps S1 to S11 shown in FIG. 3A. 3B to 3F show more specific contents of steps S3 to S4 and steps S6 to S8. Hereinafter, steps S1 to S11 will be described in order with reference to FIGS. 3A to 3F. The following steps S1 to S11 are processes when the cold / hot water supply system is put into a normal operation state after being started.

Further, FIGS. 4A to 17 show specific examples (specific numerical values) of the cold / hot water supply method according to the embodiment of the present invention. In order to facilitate understanding of the relationship between the processing of each step and specific numerical values, step numbers are assigned to FIGS. 4 to 17.

(Step S1)
When the calculation condition set by the administrator is input to the input unit, the calculation condition input to this input unit is output to the control device. Then, when the calculation condition is input to the control device, the control device stores the calculation condition in step S1. The calculation conditions in this case are the following items (1) to (4). 4A and 4B show an example of specific numerical values of the calculation conditions.

(1) CGS
・ Rated output ・ Power generation efficiency ・ Waste heat recovery efficiency (hot water, steam)
・ Auxiliary equipment rate

(2) Heat source machine ・ Rated output, rated flow rate, rated power consumption, cooling COP of two steam genelinks
・ Rated output, rated flow rate, cooling COP of turbo chiller
・ Characteristics of waste hot and hot water utilization of two steam genelinks ・ Rated output and rated flow rate of steam-hot water heat exchanger ・ Rated output and rated flow rate of hot water-hot water heat exchanger ・ Efficiency of boiler

(3) Heat source machine auxiliary equipment / primary pump rated power consumption, inverter efficiency, coefficient (*), lower limit frequency ratio / cooling water pump rated power consumption, inverter efficiency, coefficient, lower limit frequency ratio / cooling tower rating Power consumption * Theoretically, the power consumption of the primary pump equipped with an inverter is proportional to the cube of the number of revolutions, but it is actually 2 to 3 power. This multiplier is referred to as an inverter coefficient here.

(4) Others ・ Optimization conditions (as an optimization index, 1: waste heat utilization, 2: gas x α + electric power x β)
・ Coefficient (α: equivalent to the unit price of gas, β: equivalent to the unit price of electric power)
・ Higher calorific value and lower calorific value of gas, and temperature and pressure correction coefficient ・ Contract power ・ Minimum power purchase amount ・ Energy usage conditions (1: electricity saving, 2: gas saving, 3: no priority)

As shown in FIGS. 4A and 4B, in this embodiment, as an example, the turbo chiller has twice the rated output and the rated flow rate with respect to the steam genelink, and similarly, the steam-. The hot water heat exchanger has twice the rated output and rated flow rate as the hot water-hot water heat exchanger.

(Step S2)
When the hot / cold water supply system is operating, the measuring unit measures various data and transmits the measured data to the control device. Then, in step S2, the control device receives the measurement data. The measurement data in this case are the following items (1) to (3). FIG. 5 shows an example of specific numerical values of the measurement data.

(1) Cooling air conditioner, required heat quantity, required flow rate

(2) Heating / air conditioner / required heat / required flow rate

(3) Electric power / received electric power (electric power received by cold / hot water supply system)
・ Air-conditioning power consumption (power consumption of heat source machines and heat source auxiliary equipment)
・ Power generation (power generated by CGS Units 1 and 2)

(Step S3)
In step S3, the control device extracts a CGS operation variation in which the total value of the generated power of the CGS is equal to or less than the value obtained by subtracting the minimum power purchase amount from the power load of the building based on the measurement data received in step S2. Specifically, in step S3, the control device executes steps S3-1 to S3-5 shown in FIG. 3B.

In step S3-1, the control device calculates the power load of the entire building. FIG. 5 shows an example of the calculation result of the power load. The power load is the total of the received power and the power generated by the two CGS (breakdown 1), and corresponds to the total of the air conditioning power consumption of the heat source machine and the heat source auxiliary machine and the building power consumption (breakdown 2). However, the total generated power of the two CGS is a value obtained by subtracting the power consumption of the auxiliary equipment of the two CGS.

In step S3-2, when the control device sets the CGS to 0 unit operation, the CGS to 1 unit operation, the CGS to 2 units operation, and the received power constant control operation, the CGS Calculate the allowable power generation for. The constant power receiving power control is to control the generated power of the CGS so that the received power becomes a certain value or more. 6A to 6D show an example of the calculation result of the generated power allowable for CGS in each operation.

In step S3-3, the control device determines how many CGS can be operated. Specifically, the total power generated by the CGS is set to 0 for CGS, 1 for CGS, 2 for CGS, and constant control of received power. It is sequentially determined whether or not the value exceeds the value obtained by subtracting the minimum power purchase amount from the power load of the building.

In step S3-4, the control device determines the operation to be calculated. Specifically, the total power generated by the CGS is set to 0 for CGS, 1 for CGS, 2 for CGS, and constant control of received power. If there is an operation whose value is less than or equal to the value obtained by subtracting the minimum power purchase amount from the power load of the building, this operation is included in the calculation, and the total value of the CGS power generation is obtained by subtracting the minimum power purchase amount from the power load of the building. If there is an operation that exceeds the value, this operation is excluded from the calculation target. As shown in FIGS. 6A to 6D, in this embodiment, as an example, when the CGS is operated by 0 units, the CGS is operated by 1 unit, and the CGS is operated by 2 units, the received power is constantly controlled. In any case of operation, the total value of the generated power of CGS is equal to or less than the value obtained by subtracting the minimum power purchase amount from the power load of the building, and is subject to calculation.

In step S3-5, the control device extracts the operation targeted for calculation as "a CGS operation variation in which the total value of the CGS power generation is equal to or less than the value obtained by subtracting the minimum power purchase amount from the power load of the building". And remember.

As described above, in step S3, the control device (operation variation extraction unit) satisfies the condition that the total value of the generated power of the plurality of CGS is equal to or less than the value obtained by subtracting the minimum power purchase amount of the building from the power load of the building. , Multiple operation variations of CGS that can be operated for a plurality of CGS are extracted.

(Step S4)
In step S4, the control device extracts a selection mode of the heat source machine satisfying the required heat amount and the required flow rate of the air conditioner based on the measurement data received in step S2. Specifically, in step S4, the control device executes steps S4-1 to S4-6 shown in FIG. 3C.

In step S4-1, the control device extracts all selection modes for the plurality of heat source machines. As shown in FIG. 7A, in this embodiment, as an example, a plurality of selection modes C1 to C7 are extracted for a plurality of heat source machines on the cooling side. C1 is a selection mode in which only steam Genelink No. 1 is selected, C2 is a selection mode in which only steam Genelink No. 2 is selected, and C3 is a selection mode in which only a turbo chiller is selected. Further, C4 is a selection mode in which steam Genelink No. 1 and steam Genelink No. 2 are selected, C5 is a selection mode in which steam Genelink No. 1 and a turbo chiller are selected, and C6 is a steam Genelink No. 2 and turbo. The selection mode in which the refrigerator is selected, C7 is the selection mode in which the steam Genelink No. 1 unit, the steam Genelink No. 2 unit, and the turbo chiller are selected.

Further, as shown in FIG. 7B, in this embodiment, as an example, a plurality of selection modes H1 to H3 are extracted for a plurality of heat source machines on the heating side. H1 selects only the steam-hot water heat exchanger, H2 selects only the hot water-hot water heat exchanger, and H3 selects the steam-hot water heat exchanger and the hot water-hot water heat exchanger. This is the selected mode.

In step S4-2, the control device calculates the total output and the total flow rate of the heat source machine in each selection mode. 7A and 7B show an example of the calculation result of the total output and the total flow rate of the heat source machine in each selection mode.

Hereinafter, the control device executes steps S4-3 to S4-5 for each selection mode for all the selection modes extracted in step S4-1 described above.

In step S4-3, the control device determines whether the total output of the heat source machine is equal to or greater than the required heat amount input in step S2. As shown in FIG. 7A, in this embodiment, as an example, in the case of C5 to C7, the total output of the heat source unit on the cooling side is equal to or larger than the required heat amount of the cooling air conditioner. Further, as shown in FIG. 7B, in this embodiment, as an example, in the case of H1 to H3, the total output of the heat source unit on the heating side is equal to or larger than the required heat amount of the heating / air conditioner.

In step S4-4, the control device determines whether the total flow rate of the heat source machine is equal to or greater than the required flow rate input in step S2. As shown in FIG. 7A, in this embodiment, as an example, in the case of C5 to C7, the total flow rate of the heat source unit on the cooling side is equal to or higher than the required flow rate of the cooling air conditioner. Further, as shown in FIG. 7B, in this embodiment, as an example, in the case of H1 to H3, the total flow rate of the heat source unit on the heating side is equal to or higher than the required flow rate of the heating / air conditioner.

In step S4-5, the control device determines whether or not the selection mode determined in step S4-4 described above is to be calculated. Specifically, when the selection mode satisfies the conditions of steps S4-3 and S4-4 described above, the selection mode is the calculation target and does not satisfy the conditions of step S4-3 or step S4-4. If it is a selection mode, the selection mode is excluded from the calculation target. As shown in FIG. 7A, C5 to C7 are calculated as an example in this embodiment, and as shown in FIG. 7B, H1 to H3 are calculated as an example in this embodiment. Has been done.

In step S4-6, the control device extracts and stores the above-mentioned selection mode as the calculation target as "selection mode satisfying the required heat quantity and required flow rate of the air conditioner". As shown in FIG. 7A, in this embodiment, as an example, C5 to C7 are extracted as a selection mode that satisfies the conditions of the required heat quantity and the required flow rate of the cooling air conditioner. Further, as shown in FIG. 7B, in this embodiment, as an example, H1 to H3 are extracted as a selection mode that satisfies the conditions of the required heat quantity and the required flow rate of the cooling air conditioner.

As described above, in step S4, each time the control device (selection mode extraction unit, first selection mode extraction unit) obtains the measurement result of the measurement unit, one or a plurality of heat source machines on the cooling side are used. From the plurality of selection modes in which the above is selected, a plurality of selection modes in which the total output and the total flow rate of the heat source machine in each selection mode satisfy the required heat quantity and the required flow rate of the cooling air conditioner are extracted, and the heat source machines on the multiple heating sides are selected. From a plurality of selection modes in which one or a plurality of heat source machines are selected, a plurality of selection modes in which the total output and the total flow rate of the heat source machine in each selection mode satisfy the required heat quantity and the required flow rate of the heating / air conditioner are extracted.

(Step S5)
In step S5, the control device extracts a selection mode in which the load apportionment ratio of the heat source machine can be adjusted. The load apportionment ratio in this case is the ratio of the heat processing amount for each heat source machine when the required heat amount is processed by a plurality of heat source machines. The load factor in this case is the ratio of the operating output to the rated output.

In this step S5, specifically, among the selection modes of the heat source machines extracted in step S4, the combination of the heat source machines having different energies as the drive source is regarded as the "selection mode in which the load apportionment ratio of the heat source machine can be adjusted". Extract. Regarding the heat source machine on the cooling side shown in FIG. 7A, as an example, in the case of C5 to C7, at least one of the steam Genelink No. 1 and the steam Genelink No. 2 and the turbo chiller are energy as a drive source. C5 to C7 are extracted as a selection mode in which the load apportionment ratio of the heat source machine can be adjusted. On the other hand, regarding the heat source machine on the heating side shown in FIG. 7B, as an example, in the case of H3, the steam-hot water heat exchanger and the hot water-hot water heat exchanger have different energy as a drive source, so that H3 Is extracted as a selection mode in which the load apportionment ratio of the heat source machine can be adjusted.

As described above, in step S5, the control device (second selection mode extraction unit) provides a selection mode in which the load apportionment ratio of the plurality of heat source machines can be adjusted among the plurality of selection modes extracted in step S4 described above. Extract.

(Step S6)
Step S6 is executed only when the selection mode in which the load apportionment ratio of the heat source machine can be adjusted is extracted in step S5 described above. In this step S6, the control device extracts the combination of the flow rates of the primary pump for the selection mode in which the load apportionment ratio of the heat source machine can be adjusted. Specifically, in step S6, the control device executes steps S6-1 to S6-10 shown in FIG. 3D for each of the selection modes extracted in step S5 described above.

In step S6-1, the control device groups the heat source machines according to the selection mode extracted in step S5 described above. As shown in FIG. 8A, in this embodiment, as an example, the steam Genelink No. 1 is divided into Group 1 and the turbo chiller is divided into Group 2 for C5, and the steam Genelink No. 2 is Group 1 for C6. Centrifugal chillers are divided into Group 2, and for C7, steam Genelink No. 1 and steam Genelink No. 2 are divided into Group 1, and turbo chillers are divided into Group 2. Further, as shown in FIG. 8B, in this embodiment, the steam-hot water heat exchanger is divided into group 1 and the hot water-hot water heat exchanger is divided into group 2 for H3.

In step S6-2, the control device creates a combination table of the inverter frequencies of the primary pumps corresponding to the heat source machines of group 1 and the heat source machines of group 2. FIG. 9A is an example of C6, and as shown in FIG. 9A, in this embodiment, the steam Genelink Unit 2 of Group 1 and the turbo refrigerator of Group 2 are primary corresponding to these. A combination table of pump inverter frequencies is shown.

In step S6-3, the control device calculates the total flow rate of the primary pump for each combination of the inverter frequencies of the primary pump. FIG. 9B shows an example of the calculation result of the total flow rate of the primary pump for C6.

In step S6-4, the control device determines whether there is a combination in which the total flow rate of the primary pump is equal to or greater than the required flow rate input in step S2. As shown in FIG. 9B, in this embodiment, as an example, in the case of the colored combination, the total flow rate of the primary pump is equal to or higher than the required flow rate input in step S2.

In step S6-5, the control device determines the combination to be the calculation target candidate. Specifically, the combination satisfying the above-mentioned step S6-4 is set as the calculation target candidate, and the combination not satisfying the above-mentioned step S6-4 condition is excluded from the calculation target candidate. As shown in FIG. 9B, in this embodiment, as an example, the colored combination is a candidate for calculation as a combination satisfying the required flow rate.

In step S6-6, the control device calculates the total rated output of the heat source machines of each group for each combination of the inverter frequencies of the primary pumps. FIG. 9C shows an example of the calculation results of the rated output of the steam Genelink and the rated output of the turbo chiller for C6.

In step S6-7, the control device proportionally divides the required heat amount input in step S2 by the rated output for each combination of the inverter frequencies of the primary pump. FIG. 9D shows an example of the result of proportionally dividing the required heat amount of the cooling air conditioner by the rated output for C6. By apportioning the required heat amount of the cooling air conditioner by the rated output, the processing heat amount (cold water production amount) for each of the steam generator and the turbo chiller can be obtained.

In step S6-8, the control device determines whether there is a combination in which the processing heat amount is equal to or less than the rated output for each of the heat source machines of each group. As shown in FIG. 9D, in this embodiment, as an example, in the case of a colored combination, the processing heat amount is equal to or less than the rated output for each of the steam generator and the turbo chiller.

In step S6-9, the control device determines the combination to be calculated. Specifically, the combination satisfying the above-mentioned step S6-8 is set as the calculation target, and the combination not satisfying the above-mentioned step S6-8 condition is excluded from the calculation target. As shown in FIG. 9D, in this embodiment, as an example, the colored combination is calculated as a combination satisfying the required heat quantity.

In step S6-10, the control device extracts and stores a combination that simultaneously satisfies the conditions of the required flow rate in the above-mentioned step S6-5 and the required heat quantity in the above-mentioned step S6-9 as a "combination of the flow rate of the primary pump". .. As shown in FIG. 9E, in this embodiment, as an example, a combination that simultaneously satisfies the required flow rate and the required heat quantity is shown in color.

Although FIGS. 9A to 9E show an example of C6, the example of C5 uses the same type of heat source machine as the example of C6, and the result obtained in step S6-10 is C6. Since it is the same as the example of, the description is omitted.

10A-10E show examples separately calculated for C7 extracted in addition to C6 in step S5 above. That is, FIG. 10A shows a combination table of the inverter frequencies of the primary pump for C7 corresponding to step S6-2. Further, FIG. 10B shows an example of the calculation result for C7 corresponding to steps S6-3 to S6-5, and FIGS. 10C and 10D show steps S6-6 to S6-. Corresponding to 9, an example of the calculation result for C7 is shown. Further, FIG. 10E shows an example of a combination of flow rates of the primary pump extracted for C7 corresponding to step S6-10. The illustration and description of the example of H3 extracted in step S5 described above will be omitted.

As described above, in step S6, each time the control device (combination extraction unit) obtains the measurement result of the measurement unit, a plurality of combinations of flow rates satisfying the required heat quantity and the required flow rate of the air conditioner for the plurality of primary pumps are extracted. do. Further, in step S6, the control device (combination extraction unit) has the required heat quantity of the air conditioner for the plurality of primary pumps for the selection mode in which the load apportionment ratio of the heat source machine extracted in step S5 is adjustable. And multiple combinations of flow rates that satisfy the required flow rate conditions are extracted.

(Step S7)
In step S7, the controller calculates the energy for all cases. Specifically, in step S7, the control device is a case-by-case diagram for all cases in which the operation variation of the CGS extracted in step S3 described above is multiplied by the selection mode of the heat source machine extracted in step S4 described above. Steps S7-1 to S7-9 shown in 3E are executed. It should be noted that steps S7-1 to S7-4 are processes for the heating side, and steps S7-5 to S7-8 are processes for the cooling side.

In step S7-1, the control device determines whether the case includes the combination of the flow rates of the primary pump on the heating side extracted in step S6 described above. If the case includes a combination of the flow rates of the primary pumps on the heating side, the process proceeds to step S7-2, and if the case does not include the combination of the flow rates of the primary pumps on the heating side, the process proceeds to step S7-2. The process proceeds to step S7-3.

As shown in FIG. 7B, in the present embodiment, when the case includes H3 on the heating side, the process proceeds to step S7-2, and when the case does not include H3 on the heating side, that is, When H1 and H2 on the heating side are included, the process proceeds to step S7-3. 11A and 11B show, as an example, an example of calculation results corresponding to the processes of steps S7-2 to S7-4 for the heating side in the case of C7 and H3.

In step S7-2, the control device extracts the combination of the flow rates of the primary pump on the heating side. FIG. 11A shows an example of a combination of the flow rate of the primary pump on the heating side (combination of the load apportionment ratio of the primary pump on the heating side) and the combination of the load factor of the heat source machine on the heating side at that time.

Hereinafter, the control device executes steps S7-3 to S7-8 for each combination for all the combinations extracted in step S7-2 described above.

In step S7-3, the control device calculates the equipment operating status of the heat source unit on the heating side. Specifically, in step S7-3, the control device calculates the heating output, hot water flow rate, waste heat hot water heat consumption, and primary pump power consumption for the hot water-hot water heat exchanger, and steam-hot water heat exchanger. For, the heating output, hot water flow rate, waste heat steam heat consumption, primary pump power consumption, and gas consumption are calculated. These calculation formulas are as follows. Further, FIG. 11A shows an example of the calculation result of the equipment operation status of the heat source unit on the heating side.

(1) Hot water-Hot water heat exchanger-Heating output = rated output x load factor-hot water flow rate = primary pump flow rate-waste heat Hot water consumption heat = heating output-primary pump power consumption = max (rated power consumption ÷ inverter efficiency x) (Lower limit frequency ratio of inverter) ^ (Inverter coefficient), Rated power consumption ÷ Inverter efficiency x (Pump load factor) ^ (Inverter coefficient))
* The formula for aligning the units is not described.

(2) Steam-hot water heat exchanger ・ Heating output = rated output x load factor ・ hot water flow rate = primary pump flow rate ・ Waste heat steam heat consumption = min (waste heat steam production amount, heating output)
・ Primary pump power consumption = max (rated power consumption ÷ inverter efficiency x (inverter lower limit frequency ratio) ^ (inverter coefficient), rated power consumption ÷ inverter efficiency x (pump load factor) ^ (inverter coefficient))
・ Gas consumption = (heating output-waste heat steam consumption heat) ÷ boiler efficiency ÷ city gas high calorific value x temperature pressure correction coefficient * The formula for aligning the units is not described.
* The lower limit frequency of the inverter may be input by setting the calculation conditions.

In step S7-4, the control device totals the waste heat utilization amount and the energy consumption amount of the heat source unit on the heating side. This calculation formula is as follows. Further, FIG. 11B shows an example of the aggregated results of the waste heat utilization amount and the energy consumption amount of the heat source unit on the heating side. Then, the process proceeds to the cooling side.

・ Waste heat utilization (hot water) = "hot water-waste heat of hot water heat exchanger hot water consumption heat consumption"
・ Waste heat utilization (steam) = "steam-waste heat steam consumption heat of hot water heat exchanger"
・ Energy consumption (power) = "Hot water-Hot water primary pump power consumption of hot water heat exchanger" + "Steam-Hot water primary pump power consumption of hot water heat exchanger"
・ Energy consumption (gas) = "steam-gas consumption of hot water heat exchanger"
* The formula for aligning the units is not described.

In step S7-5, the control device determines whether the case includes the combination of the flow rates of the cooling side primary pump extracted in step S6 described above. If the case contains a combination of the flow rates of the primary pumps on the cooling side, the process proceeds to step S7-6, and if the case does not include the combination of the flow rates of the primary pumps on the cooling side, the process proceeds to step S7-6. The process proceeds to step S7-7.

As shown in FIG. 7A, in the present embodiment, when the case includes C5 to C7 on the cooling side, the process proceeds to step S7-6, and the selection mode of C5 to C7 on the cooling side in the case. When the above is not included, that is, when C1 to C4 on the cooling side are included, the process proceeds to step S7-7. 11C and 11D show, as an example, an example of calculation results corresponding to the processes of steps S7-6 to S7-8 for the cooling side in the case of C7 and H3.

In step S7-6, the control device extracts the flow rate combination of the primary pump on the cooling side. 11C and 11D show an example of a combination of the flow rate of the primary pump on the cooling side and the load factor of the heat source machine on the cooling side at that time.

Hereinafter, the control device executes steps S7-7 to S7-8 for each combination for all the combinations extracted in step S7-6 described above.

In step S7-7, the control device calculates the equipment operating status of the heat source unit on the cooling side. Specifically, in step S7-7, the control device calculates the cooling output, the chilled water flow rate, the waste heat and hot water consumption heat consumption, the power consumption, and the gas consumption amount for the steam genelink, and cools the turbo chiller. Calculate output, cold water flow rate, and power consumption. These calculation formulas are as follows. Further, FIG. 11C shows an example of the calculation result of the equipment operation status of the heat source unit on the cooling side.

(1) About steam genelink ・ Cooling output = rated output × load factor ・ chilled water flow rate = primary pump flow rate ・ waste heat and hot water consumption heat = min (A, B, C)
A = a x load factor + b
B = a'× load factor + b'
* Enter a, b, a', b'in the calculation condition setting C = Waste heat hot water production amount-Heating side waste heat hot water consumption heat / cooling output (waste heat hot water) = Waste heat hot water consumption heat x Cooling COP ( Hot water)
・ Waste heat steam consumption heat = min (D, E)
D = (cooling output-cooling output (hot water)) ÷ cooling COP
E = Waste heat steam production amount-Heating side waste heat steam heat consumption / cooling output (waste heat steam) = Waste heat steam heat consumption x Cooling COP
・ Cooling output (gas steam) = Cooling output-Cooling output (waste heat hot water) -Cooling output (waste heat steam)
・ Primary pump power consumption = max (rated power consumption ÷ inverter efficiency x (inverter lower limit frequency ratio) ^ (inverter coefficient), rated power consumption ÷ inverter efficiency x (pump load factor) ^ (inverter coefficient))
・ Power consumption (cooling water pump) = max (rated power consumption ÷ inverter efficiency × (inverter lower limit frequency ratio) ^ (inverter coefficient), rated power consumption ÷ inverter efficiency × (heat source machine load factor) ^ (inverter coefficient))
・ Power consumption (cooling tower) = rated power consumption x heat source machine load factor ・ Power consumption (main unit) = if (heat source machine load factor> 0, heat source machine rated power consumption, 0)
・ Gas consumption = cooling output (gas steam) ÷ cooling COP ÷ boiler efficiency ÷ city gas high calorific value × temperature pressure correction coefficient * The formula for aligning the units is not described.
* The lower limit frequency of the inverter may be input by setting the calculation conditions.

(2) About turbo refrigerating machine ・ Cooling output = rated output × load factor ・ chilled water flow rate = primary pump flow rate ・ primary pump power consumption = max (rated power consumption ÷ inverter efficiency × (inverter lower limit frequency ratio) ^ (inverter coefficient), Rated power consumption ÷ Inverter efficiency x (Pump load factor) ^ (Inverter coefficient))
・ Power consumption (cooling water pump) = max (rated power consumption ÷ inverter efficiency × (inverter lower limit frequency ratio) ^ (inverter coefficient), rated power consumption ÷ inverter efficiency × (heat source machine load factor) ^ (inverter coefficient))
・ Power consumption (cooling tower) = Rated power consumption x Heat source machine load factor ・ Power consumption (main unit) = Cooling output ÷ Cooling COP
* The formula for aligning the units is not described.
* The lower limit frequency of the inverter may be input by setting the calculation conditions.

In step S7-8, the control device totals the waste heat utilization amount and the energy consumption amount of the heat source unit on the cooling side. FIG. 11D shows an example of the aggregated results of the waste heat utilization amount and the energy consumption amount of the heat source machine on the cooling side.

In step S7-9, the control device aggregates the equipment operation status of the heat source units on the heating side and the cooling side, aggregates the amount of waste heat used by the heat source units on the heating side and the cooling side, and heat sources on the heating side and the cooling side. Aggregate the energy consumption of the aircraft. FIG. 11E shows an example of the aggregated results of the equipment operation status of the heat source machines on the heating side and the cooling side, and FIG. 11F shows the aggregated results of the waste heat utilization of the heat source machines on the heating side and the cooling side. An example and an example of the aggregated results of the energy consumption of the heat source machines on the heating side and the cooling side are shown.

Further, FIGS. 12A to 12F show an example of the calculation results in the case of C7 and H1. That is, FIG. 12A shows an example of the combination of the flow rate of the primary pump on the heating side and the load factor of the heat source machine at that time, and an example of the calculation result of the equipment operation status of the heat source machine on the heating side, and FIG. 12B shows. , An example of the aggregated results of waste heat utilization and energy consumption of the heat source unit on the heating side is shown. Further, FIG. 12C shows an example of the combination of the flow rate of the primary pump on the cooling side and the load factor of the heat source machine at that time, and the calculation result of the equipment operation status of the heat source machine on the cooling side, and FIG. 12D shows an example. , An example of the aggregated results of waste heat utilization and energy consumption of the heat source machine on the cooling side is shown. Further, FIG. 12E shows an example of the aggregation result of the equipment operation status of the heat source machines on the heating side and the cooling side, and FIG. 12F shows the aggregation of the waste heat utilization of the heat source machines on the heating side and the cooling side. An example of the result and an example of the aggregated result of the energy consumption of the heat source machine on the heating side and the cooling side are shown.

As described above, in step S7, the control device (calculation unit) determines the energy consumption amount and waste heat utilization amount of the heat source machine for each of the plurality of selection modes of the heat source machine on the cooling side extracted in step S4 described above. In addition to the calculation, the energy consumption amount and the waste heat utilization amount of the heat source machine are calculated for each of the plurality of selection modes of the heat source machine on the heating side extracted in step S4 described above. Further, in step S7, the control device (calculation unit) has energy for a plurality of cases obtained by multiplying the plurality of operation variations extracted in the above step S3 by the plurality of selection modes extracted in the above step S4. Calculate consumption and waste heat utilization. Further, in step S7, the control device (calculation unit) calculates the energy consumption amount and waste heat utilization amount of the plurality of heat source machines for each combination of the plurality of flow rates extracted in step S6 described above.

(Step S8)
In step S8, the control device extracts the optimum solution. Specifically, in step S8, the control device executes steps S8-1 to S8-8 shown in FIG. 3F.

In step S8-1, the control device determines whether the received power exceeds the contract power in all the cases processed above. If the received power exceeds the contract power in all cases, the process proceeds to step S8-2, and if the received power does not exceed the contract power in all cases, the process proceeds to step S8-3. In this embodiment, as an example, the received power is less than the contract power in all cases.

In step S8-2, the control device selects the selection mode with the lowest power consumption.

In step S8-3, the control device determines whether the optimization index is the waste heat utilization amount. This optimization index is set as an optimization condition in the calculation condition of step S1 described above. If the optimization index is the waste heat utilization amount, the process proceeds to step S8-4, and the calculation case having the largest waste heat utilization amount is selected. On the other hand, if the optimization index is not the amount of waste heat utilized, the process proceeds to step S8-5.

In step S8-5, the control device determines what the energy utilization conditions are. If the energy usage condition is gas saving, the process proceeds to step S8-6, and if the energy usage condition is electricity saving gas saving, the process proceeds to step S8-7, and the energy usage condition has no priority. In that case, the process proceeds to step S8-8.

In step S8-6, the control device selects the calculation case with the lowest gas consumption.

In step S8-7, the control device selects the calculation case with the lowest power consumption.

In step S8-8, the control device selects the calculation case having the smallest gas consumption × α + power consumption × β. Here, a constraint condition may be added, such as selecting a case in which the gas consumption × α + power consumption × β is the smallest in the specified gas consumption or more.

As shown in FIG. 4B, in this embodiment, the energy utilization conditions are set without priority, and examples corresponding to these are shown in FIGS. 13A to 16B. As shown in FIGS. 13A to 16B, in this embodiment, the calculation case in which gas consumption × α + power consumption × β is the smallest is NO. Since it is 11, the control device is NO. 11 is extracted as the optimum solution.

As described above, in step S8, the control unit (selection unit) consumes the least amount of energy from the plurality of heat source machines on the cooling side and the heat source machines on the heating side based on the calculation result of step S7 described above. Select the combination of the heat source machine on the side and the heat source machine on the heating side, or the combination of the heat source machine on the cooling side and the heat source machine on the heating side, which use the largest amount of waste heat. Further, in this step S8, the control unit (selection unit) determines the combination of the flow rates or the waste heat that minimizes the energy consumption of the plurality of heat source machines from the combination of the plurality of flow rates based on the calculation result of the above step S7. Select the combination of flow rates that will be used most.

(Step S9)
In step S9, the control device determines whether or not a certain period of time has elapsed in which the optimum solution obtained each time the steps S1 to S8 are repeatedly executed is the same. The control device repeatedly executes the above steps S1 to S8 until a certain period of time elapses in a state where the optimum solution is the same. Then, when the state in which the optimum solution is the same elapses for a certain period of time, the process proceeds to step S10.

(Step S10)
In step S10, the control device executes the operation with the optimum solution. Specifically, in step S10, the control device controls the control signal related to the operation variation (number of operating units) of the CGS and the operation or stop of each heat source unit so that the control device is operated with the optimum solution extracted in step S8 described above. The signal and the inverter control signal are output to the inverter of the primary pump.

When the inverter control signal output from the control device is input to the inverter, the frequency of the inverter is increased or decreased, so that the rotation speed of the primary pump and the flow rate of the primary pump are increased or decreased.

As described above, in step S10, the control device (execution unit) executes the operation of the CGS with the operation variation (number of operating units) of the CGS selected in the above-mentioned step S8. Further, in this step S10, the control device (execution unit) combines the heat source machine on the cooling side and the heat source machine on the heating side selected in step S8 above with the heat source machine on the cooling side and the heat source machine on the heating side. To execute the operation of. Further, in this step S10, the control device (execution unit) causes the operation of the plurality of primary pumps to be executed by the combination of the flow rates selected in the above-mentioned step S8.

(Step S11)
In step S11, the control device determines whether the predetermined time has elapsed. In this case, as a general rule, the time corresponds to the time from when the flow rate of the primary pump is changed until the drive of the heat source machine becomes stable. The control device repeatedly executes step S11 until the predetermined time elapses, and returns to the above-mentioned step S2 when the predetermined time elapses.

Then, the processes of steps S2 to S11 described above are repeatedly executed. In the cold / hot water supply method according to the embodiment of the present invention, cold water is supplied to the cooling air conditioner and hot water is supplied to the heating air conditioner as described above.

Next, the operation and effect of one embodiment of the present invention will be described.

As described in detail above, according to one embodiment of the present invention, the total of the generator, the heat source unit, the primary pump, etc., after simultaneously satisfying the required heat amount and the required flow rate of the air conditioner on the cooling side and the heating side. The operation of the heat source machine on the cooling side and the heat source machine on the heating side is executed by the combination of the heat source machines with the lowest energy consumption or the combination of the heat source machines with the highest waste heat utilization. Therefore, compared to the case where the number of operating heat source machines is increased or decreased based on a preset load factor based on the required heat amount, not only the required heat amount but also the required flow rate is satisfied and the heat source machine is operated. Since the load factor when the number of units increases or decreases can always be changed to the optimum load factor based on information such as the required heat amount and the required flow rate, further energy saving can be achieved.

Further, according to one embodiment of the present invention, the combination of the primary pump flow rates with the lowest total energy consumption of the generator, heat source, primary pump, etc., or the primary pump flow rate with the highest waste heat utilization. The operation of the primary pump is executed in combination. As a result, the heat source machine is operated in a state where the load is apportioned to the optimum ratio. Therefore, compared to the case where the flow rate ratio is made uniform and only the energy consumption of the primary pump is controlled to be minimized, the total flow rate of the generator, heat source machine, primary pump, etc. is adjusted while adjusting the flow rate ratio to the optimum ratio. Since the energy consumption is controlled to be the minimum or the waste heat utilization is controlled to the maximum, further energy saving can be achieved.

Further, according to one embodiment of the present invention, the number of operating generators or the amount of waste heat used so as to minimize the total energy consumption including the heat source machine main body and other auxiliary machines is to be the largest. The operation of the generator is executed by the number of operating generators. Therefore, as compared with the case where the number of operating generators is set in advance, the number of operating generators is automatically reviewed as the optimum number of generators at any time, so that further energy saving can be achieved.

Next, a modified example of one embodiment of the present invention will be described.

In the above embodiment, the control target may be any of a heat source machine, a heat source machine and CGS, a primary pump, a primary pump and a heat source machine, and a primary pump and a heat source machine and CGS.

When the control target is only the heat source machine, the operating state of the CGS and the flow rate of the primary pump are set as given conditions, and the total energy consumption of the generator, heat source machine, primary pump, etc. is the lowest. The combination of machines or the combination of heat source machines with the largest amount of waste heat is selected by calculation, and the operation of the heat source machines on the cooling side and the heating side is executed.

When the control target is a heat source machine and CGS, the combination of a generator, a heat source machine, a primary pump, and other heat source machines that consume the least total energy, with the flow rate of the primary pump as a given condition. The operation variation of the CGS or the combination of the heat source machine with the largest amount of waste heat utilization and the operation variation of the CGS are selected by calculation, and the operation of the heat source machine on the cooling side and the heating side and the CGS is executed.

In addition, when the control target is only the cold water primary pump, the total energy consumption of the generator, heat source unit, primary pump, etc. is the highest, with the operating state of the CGS and the number of operating heat source units as given conditions. The combination of the small flow rate or the combination of the flow rate with the largest amount of waste heat utilization is selected by calculation, and the operation of the primary pump and the flow rate adjustment are executed.

When the control target is a primary pump and a heat source machine, the operating state of the CGS is set to a given condition, and the combination of the heat source machine such as the generator, the heat source machine, and the primary pump, which consumes the least total energy. The combination of the heat source machine and the flow rate, or the combination of the heat source machine with the largest amount of waste heat and the flow rate is selected by calculation, and the operation of the heat source machine on the cooling side and the heating side, the operation of the primary pump, and the flow rate adjustment are executed. ..

When the control target is the primary pump, the heat source machine, and the CGS, as described in the above embodiment, the combination of the heat source machine having the lowest total energy consumption such as the generator, the heat source machine, and the primary pump, and the combination of the flow rate. The operation variation of CGS, or the combination of heat source machine with the largest amount of waste heat and the combination of flow rate and the operation variation of CGS are selected by calculation, and the operation of the heat source machine on the cooling side and the heating side and the operation and flow rate of the primary pump are selected. Adjustment and CGS operation are performed.

Further, in the above embodiment, the power consumption of the cooling water pump, the cooling tower, etc. is also calculated, but for the sake of simplification, this calculation may be omitted.

Further, in the above embodiment, the plurality of heat source machines on the cooling side are a heat source machine using electricity as a drive source, a heat source machine using gas as a drive source, a heat source machine using hot water as a drive source, and a heat source using steam as a drive source. Includes multiple heat source machines that are either a machine, a heat source machine driven by hot water and gas, or a heat source machine driven by hot water or steam, and is used as a cooling air conditioner with at least one of energy consumption and waste heat utilization. Any combination may be used as long as it supplies cold water.

Further, in the above embodiment, the plurality of heat source machines on the heating side are a heat source machine using electricity as a drive source, a heat source machine using gas as a drive source, a heat exchanger using hot water as a drive source, and steam as a drive source. Any combination may be used as long as it includes a plurality of heat source machines, which are any of the heat exchangers, and supplies hot water to the heating air conditioner with at least one of energy consumption and waste heat utilization.

Further, in the above embodiment, in the hot water circulation circuit, the hot water-hot water heat exchanger is connected in series to the plurality of steam genelinks, but the hot water-hot water heat is connected to the plurality of steam genelinks. The exchangers may be connected in parallel.

Further, in the above embodiment, only a generator that produces either hot water or steam may be applied.

Further, in the above embodiment, the partial load efficiency characteristics of the CGS and the steam boiler may be taken into consideration. Further, the partial load efficiency characteristics and the cooling water temperature characteristics of the heat source machine may be taken into consideration. Further, based on the actual operation data of the CGS, the heat source machine, and the steam boiler, the partial load efficiency characteristics may be learned including the influence of equipment deterioration, and the learned partial load efficiency characteristics may be used.

Further, in the above embodiment, the primary pump is provided on the return pipe side of the heat source machine, but may be provided on the outbound pipe side.

Further, in the above embodiment, α corresponds to the unit price of gas and beta corresponds to the unit price of electric power, but it is not limited to the unit price and may be a CO2 emission factor or a primary energy intensity.

Further, in the above embodiment, both the energy consumption amount and the waste heat utilization amount are calculated in step S7, but only one of the energy consumption amount and the waste heat utilization amount may be calculated.

Further, in the above embodiment, when extracting the selection mode of the heat source machine, all the selection modes satisfying the required heat amount and the required flow rate of the air conditioner are extracted. Based on the multiple number control modes that indicate the start priority of the heat source machines set in A method of designating the number control mode for the control panel may be used.

Further, the above embodiment is an example in which two CGS units are installed, but one or a plurality of CGS units may be installed. When one CGS is installed, in step S3-2, the CGS can be operated in each of the case where the CGS is operated to 0 units, the CGS is operated to 1 unit, and the received power constant control operation is performed. Whether or not it is determined and the operation variation of CGS is extracted. When three generators are installed, in step S3-2, when CGS is operated to 0, CGS is operated to 1, CGS is operated to 2, and CGS is operated to 3. If so, it is determined whether or not the CGS can be operated in each of the cases where the received power constant control operation is performed, and the operation variation of the CGS is extracted.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that the present invention can be variously modified and implemented without departing from the gist thereof. Is.

S Cold / hot water supply system 11 Cooling air conditioner 12 Heating air conditioner 20 Waste heat supply system 21 CGS
22 Steam boiler 23 Steam circulation circuit 24 Hot water circulation circuit 30 Cold water production system 31 Steam Genelink 32 Turbo chiller 40 Hot water production system 41 Hot water heat exchanger 42 Hot water heat exchanger 50 Control device 51 Operation variation extraction unit 52 First selection mode Extraction unit 53 Second selection mode Extraction unit 54 Extraction unit 55 Calculation unit 56 Selection unit 57 Execution unit 60 Cold water supply circuit 70 Hot water supply circuit 81 Primary pump 82 Primary pump 91 Primary pump 92 Primary pump 101, 102 Inverter 111, 112 Inverter 121 Input unit 122 Measurement unit

Claims (2)

A heat source machine that uses electricity as a drive source, a heat source machine that uses gas as a drive source, a heat source machine that uses hot water as a drive source, a heat source machine that uses steam as a drive source, a heat source machine that uses hot water and gas as a drive source, hot water and steam. A plurality of heat source machines on the cooling side, which include a plurality of heat source machines that are one of the heat source machines driven by the above, and supply cold water to the cooling air conditioner with at least one of energy consumption and waste heat utilization.
It includes multiple heat source machines that are either an electric heat source machine, a gas-powered heat source machine, a hot water-powered heat exchanger, or a steam-powered heat exchanger, and consumes energy. And multiple heat source machines on the heating side that supply hot water to the heating air conditioner with at least one of the waste heat utilization.
A measuring unit that measures the required heat quantity and required flow rate of the cooling air conditioner and the heating air conditioner, respectively.
Every time the measurement result of the measuring unit is obtained, the total output and total of the heat source machines in each selection mode are selected from a plurality of selection modes in which all combinations of one or a plurality of heat source machines among the plurality of cooling side heat source machines are selected. A plurality of selection modes in which the flow rate satisfies the required heat amount and the required flow rate of the cooling air conditioner are extracted, and a plurality of selections in which all combinations of one or a plurality of heat source machines on the heating side are selected. A selection mode extraction unit that extracts a plurality of selection modes in which the total output and total flow rate of the heat source machine in each selection mode satisfy the conditions of the required heat amount and the required flow rate of the heating / air conditioner.
At least one of the energy consumption amount and the waste heat utilization amount of the heat source machine is calculated for each of the plurality of selection modes of the heat source machine on the cooling side extracted by the selection mode extraction unit, and is extracted by the selection mode extraction unit. A calculation unit that calculates at least one of the energy consumption amount and the waste heat utilization amount of the heat source machine for each of the plurality of selection modes of the heat source machine on the heating side.
Based on the calculation result of the calculation unit, a combination of the cooling side heat source machine and the heating side heat source machine having the lowest energy consumption from the plurality of cooling side heat source machines and the plurality of heating side heat source machines, or The selection unit that selects the combination of the heat source machine on the cooling side and the heat source machine on the heating side that uses the largest amount of waste heat.
The operation mode of the heat source machine selected by the selection unit is the execution unit that executes the operation of the heat source machine on the cooling side and the heating side at the load factor which is the ratio of the operation output to the rated output of the heat source machine.
Equipped with
Each time the measuring unit obtains the measurement results of the required heat amount and the required flow rate , the operation combination mode of a plurality of heat source machines within the range satisfying the required heat amount and the required flow rate is set to the operation output of the heat source machine with respect to the rated output. A cold / hot water supply system that determines the load factor of each heat source machine by selecting a combination of load factors, which is a ratio. With one or more generators that produce at least one of hot water and steam,
Within the range where the total value of the generated power of the one or more generators is equal to or less than the value obtained by subtracting the minimum power purchase amount of the building from the power load of the building in which the cooling air conditioner and the heating air conditioner are installed. , An operation variation extraction unit that extracts a plurality of operation variations of generators that can be operated for the one or a plurality of generators.
Further prepare
The plurality of cooling side heat source machines and the plurality of heating side heat source machines include heat source machines driven by at least one of hot water and steam generated by the one or more generators.
The calculation unit has the energy consumption amount and the waste heat for a plurality of cases in which a plurality of operation variations extracted by the operation variation extraction unit are multiplied by a plurality of selection modes extracted by the selection mode extraction unit. Calculate at least one of the usage and
Based on the calculation results of the calculation unit, the selection unit may use the operation variation of the generator with the lowest energy consumption, the combination of the heat source machine on the cooling side and the heat source machine on the heating side, or the heat source machine on the heating side from the plurality of cases. Select the operation variation of the generator that uses the most waste heat and the combination of the heat source machine on the cooling side and the heat source machine on the heating side.
The execution unit executes the operation of the generator according to the operation variation of the generator selected by the selection unit, and the heat source machine on the cooling side and the heat source machine on the heating side selected by the selection unit are used. In combination, the operation of the heat source machine on the cooling side and the heat source machine on the heating side is executed.
The cold / hot water supply system according to claim 1.

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