JP6029363B2 - Heat source system - Google Patents

Description

  The present invention relates to a heat source system.

  A heat source system that includes a plurality of heat source units and supplies cold heat to the heat load by supplying a low-temperature heat medium to the heat load is widely known. As background art of this technical field, for example, Patent Document 1 discloses that “the number of inverter-driven turbo chillers 1c to 1e to be operated is controlled by the control device 9 according to the required heat quantity that the plurality of inverter-driven turbo chillers 1c to 1e should cover. In the control, the control device 9 has a coefficient of performance equal to or greater than a predetermined value in the relationship between the coefficient of performance and the load factor of the inverter-driven turbo chillers 1c to 1e determined by the temperature of the cooling water detected by the thermometer t. The load factor range is determined, and the inverters of the inverter-driven turbo chillers 1c to 1e are controlled so that the load factors of the individual inverter-driven turbo chillers 1c, 1d, and 1e are within the determined load factor range. (See summary).

JP 2005-114295 A

Regarding the relationship between the load factor and the coefficient of performance (COP) in the refrigerator provided in the heat source system, the COP increases as the load factor increases. Therefore, in the case of heat demand that reduces the load factor of the refrigerator, the heat stored in the heat storage tank in advance is supplied to the load, so that the operation of the refrigerator at a low load factor (operation with a low COP) is performed. ) To avoid energy saving.
In addition, the energy consumption characteristics of equipment (utility equipment such as pumps and cooling towers) other than the refrigerator provided in the heat source system change depending on the operating conditions. Therefore, the COP of the entire heat source system varies depending on the amount of heat load to be processed (heat demand required by the heat load) and the wet bulb temperature of the outside air. Also, in heat source systems with multiple refrigerators, the number of refrigerators and utility equipment that are operated changes when the order of operation of the refrigerators is switched when the heat demand or the wet bulb temperature of the outside air changes depending on the season and time of day. Therefore, the COP of the entire heat source system changes greatly.

In order to operate such a heat source system with energy saving, it is required to operate under an operation condition in which the COP becomes high. However, since the amount of change and the rate of change of the heat demand of the heat load and the wet bulb temperature vary depending on the season and time zone, the operating conditions for increasing the COP also differ. In a heat source system equipped with a plurality of refrigerators, the operation order of the refrigerators changes. For this reason, it is difficult to always maintain the COP of the heat source system including a plurality of refrigerators at a high level.
For example, even in the heat source system disclosed in Patent Document 1, it is difficult to control a plurality of refrigerators so as to maintain the COP high with respect to fluctuations in heat load.

  Therefore, an object of the present invention is to provide a heat source system that can be operated while controlling a plurality of refrigerators and maintaining a high coefficient of performance.

In order to solve the above problems, the present invention provides a heat source system configured to include at least two systems of heat source units including a refrigerator. And, a simulation means for calculating a coefficient of performance for each heat source unit, a priority setting unit for setting a higher priority for operation in order of a heat source unit having the highest coefficient of performance, and a prediction of a change in heat demand due to heat load based on includes a schedule determining means for determining the operation schedule as operated first from the heat source device priority is set high, and a driving control means for driving the heat source apparatus based on the operation schedule, priority The rank setting means further has a feature that the priority is set based on the occurrence frequency of the combination of the wet bulb temperature of the outside air and the load factor of the heat source unit .

  According to the present invention, it is possible to provide a heat source system that can be operated while controlling a plurality of refrigerators and maintaining a high coefficient of performance.

It is a block diagram of the heat source system which concerns on a present Example. It is a figure which shows the functional block of a control apparatus. (A) is a figure which shows the evaluation function of a different refrigerator with a format difference, (b) is a figure which shows the evaluation function of the refrigerator which changes with seasons. It is a figure which shows the coefficient of performance of the refrigerator which changes according to the change of a heat demand, and the change. It is a flowchart which shows the procedure in which an energy-saving thermal storage thermal radiation schedule determination means calculates the operation schedule for operating a heat-source system. It is a figure which shows one example of transition of a heat demand, and the thermal storage operation target value STL and the heat radiation operation target value RTL determined corresponding to it.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

FIG. 1 is a configuration diagram of a heat source system according to the present embodiment.
Hereinafter, a refrigerator and utility equipment operated with the refrigerator are referred to as a heat source machine.
Although FIG. 1 shows a heat source system including three heat source machines, the number of heat source machines is not limited to three. It may be a heat source system provided with two heat source machines or a heat source system equipped with four or more heat source machines.

As shown in FIG. 1, the heat source system 1 includes three systems (first system 1 a, second system 1 b, and third system 1 c), and each heat source apparatus is controlled by a control device 13.
In this embodiment, the first system 1a is a system provided with an inverter turbo chiller 4a as a refrigerator, the second system 1b is a system provided with a turbo chiller 4b as a refrigerator, and the third system 1c is an exhaust heat utilization absorption as a refrigerator. Let it be a system | strain provided with the cold / hot water machine 4c.
In addition, the combination of the refrigerators contained in each heat source machine is not limited to this combination.

The first system 1a is a system in which the first cooling water W1a is circulated by the cooling water pump 2a, and drives the cooling tower 5a that cools the first cooling water W1a, the cooling fan 17a that blows air to the cooling tower 5a, and the cooling fan 17a. Utility equipment such as an inverter 9a and an inverter 10a for driving the cooling water pump 2a is included.
The cooling fan 17a preferably has a variable rotational speed by inverter control, and can adjust the cooling amount of the first cooling water W1a in the cooling tower 5a. Moreover, it is preferable that the cooling water pump 2a can adjust the flow volume of the 1st cooling water W1a by inverter control.

The second system 1b is a system in which the second cooling water W1b is circulated by the cooling water pump 2b, and drives the cooling tower 5b that cools the second cooling water W1b, the cooling fan 17b that blows air to the cooling tower 5b, and the cooling fan 17b. Utility equipment such as an inverter 9b and an inverter 10b for driving the cooling water pump 2b is included.
The cooling fan 17b preferably has a variable rotational speed by inverter control, and can adjust the cooling amount of the second cooling water W1b in the cooling tower 5b. Moreover, it is preferable that the cooling water pump 2b can adjust the flow volume of the 2nd cooling water W1b by inverter control.

The third system 1c is a system in which the third cooling water W1c is circulated by the cooling water pump 2c, and drives the cooling tower 5c that cools the third cooling water W1c, the cooling fan 17c that blows air to the cooling tower 5c, and the cooling fan 17c. Utility equipment such as an inverter 9c and an inverter 10c for driving the cooling water pump 2c is included.
Preferably, the cooling fan 17c has a variable rotational speed by inverter control, and can adjust the cooling amount of the third cooling water W1c in the cooling tower 5c. Moreover, it is preferable that the cooling water pump 2c can adjust the flow volume of the 3rd cooling water W1c by inverter control.
A gas engine 12 is connected to the exhaust heat utilization absorption chiller / heater 4c. The gas engine 12 and the exhaust hot water pump 16 connected to the gas engine 12 are operated according to the power demand of a power demand source (not shown).

  Further, the heat source system 1 is provided with a cold / hot water return header 7a and a cold / hot water return header 7b, and the cold / hot water return header 7a and the cold / hot water return header 7b are respectively connected to the heat load 8. The heat load 8 is a load source that generates heat demand, and gives heat to the cold water W3 supplied from each heat source machine via the cold / hot water feed header 7a. Moreover, the heat load 8 returns the cold water W3 which became high temperature to each heat source machine via the cold / hot water recovery header 7b.

  The inverter turbo chiller 4a of the first system 1a, the turbo chiller 4b of the second system 1b, and the exhaust heat utilization absorption chiller / heater 4c of the third system 1c are connected to the chilled / hot water header 7a. And the 1st cold / hot water W2a cooled with the 1st cooling water W1a with the inverter turbo refrigerator 4a, the 2nd cold / hot water W2b cooled with the 2nd cooling water W1b with the turbo refrigerator 4b, and waste heat utilization absorption cold temperature The 3rd cold / hot water W2c cooled by the 3rd cooling water W1c with the water machine 4c becomes the cold water W3 via the cold / hot water forward header 7a, and is supplied to the thermal load 8.

Further, the inverter turbo chiller 4a, the turbo chiller 4b, and the exhaust heat utilization absorption chiller / heater 4c are connected to the chilled / hot water return header 7b. And the cold water W3 which became high temperature with the heat load 8 is sent into the inverter turbo refrigerator 4a as the 1st cold / hot water W2a by the cold / hot water pump 3a from the cold / hot water recovery header 7b. The cold / hot water pump 3a is driven by the inverter 11a.
Moreover, the cold water W3 which became high temperature with the heat load 8 is sent into the turbo refrigerator 4b as the 2nd cold / hot water W2b by the cold / hot water pump 3b from the cold / hot water recovery header 7b. The cold / hot water pump 3b is driven by the inverter 11b. Further, the chilled water W3 that has become high temperature by the heat load 8 is sent from the chilled / hot water recovery header 7b to the exhaust heat utilization absorption chiller / heater 4c as the third chilled / hot water pump 3c as the third chilled / hot water W2c. The cold / hot water pump 3c is driven by the inverter 11c.

Moreover, the heat source system 1 of the present embodiment is provided with a water storage tank 20 for storing the cold water W3 as a heat storage tank.
The water storage tank 20 is a storage unit that stores the chilled water W3 that has been cooled by the inverter turbo chiller 4a, the turbo chiller 4b, and the exhaust heat utilization absorption chiller / heater 4c and sent to the chilled / hot water flow header 7a. It is a device that stores cold energy by storing it.
Further, the water tank 20 is provided with a pump (heat supply pump 21). The cold heat (cold water W <b> 3) stored in the water storage tank 20 is supplied to the heat load 8 by the heat supply pump 21.
The heat supply pump 21 preferably has a configuration in which the rotation speed is adjusted, for example, by inverter control. With this configuration, for example, the control device 13 can adjust the supply amount of the cold water W3 from the water storage tank 20 to the heat load 8 by adjusting the rotation speed of the heat supply pump 21.

The inlet A1i and the outlet A1o of the first cooling water W1a of the inverter turbo chiller 4a are provided with thermometers 41a and 41b for measuring the temperature of the first cooling water W1a, and the first cold / hot water of the inverter turbo chiller 4a. Thermometers 42a and 42b for measuring the temperature of the first cold / hot water W2a are provided at the inlet A2i and the outlet A2o of W2a.
The inlet B1i and the outlet B1o of the second cooling water W1b of the turbo chiller 4b are provided with thermometers 51a and 51b for measuring the temperature of the second cooling water W1b, and the second chilled hot water W2b of the turbo chiller 4b The inlet B2i and the outlet B2o are provided with thermometers 52a and 52b for measuring the temperature of the second cold / hot water W2b.
Furthermore, the inlet C1i and the outlet C1o of the third cooling water W1c of the exhaust heat utilization absorption chiller / heater 4c are provided with thermometers 61a and 61b for measuring the temperature of the third cooling water W1c. Thermometers 62a and 62b for measuring the temperature of the third cold / hot water W2c are provided at the inlet C2i and the outlet C2o of the third cold / hot water W2c of 4c.

The first system 1a includes flow meters 43 and 44 for measuring the flow rates of the first cooling water W1a and the first cold / hot water W2a flowing into the inverter turbo chiller 4a, and the second system 1b includes a turbo refrigeration. Flow meters 53 and 54 for measuring the flow rates of the second cooling water W1b and the second cold / hot water W2b flowing into the machine 4b are provided.
Furthermore, the 3rd system | strain 1c is equipped with the flowmeters 63 and 64 which measure the flow volume of the 3rd cooling water W1c and the 3rd cold / hot water W2c which flow into the waste heat utilization absorption cold / hot water machine 4c.
In the vicinity of the cooling towers 5a, 5b, and 5c, wet bulb thermometers 45, 55, and 65 that measure the wet bulb temperature in the atmosphere, and relative hygrometers 46, 56, and 66 that measure the humidity (relative humidity) in the atmosphere. Is equipped.

  And each thermometer 41a, 41b, 42a, 42b, 51a, 51b, 52a, 52b, 61a, 61b, 62a, 62b, each flow meter 43, 44, 53, 54, 63, 64 and wet bulb thermometer 45, The measured values of 55 and 65 and the relative hygrometers 46, 56 and 66 are input to the control device 13.

FIG. 2 is a diagram showing functional blocks of the control device 13.
The control device 13 is a control device having a general configuration including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a storage device (HDD: Hard Disk Drive, etc.) not shown. For example, the CPU executes a program written in the ROM so as to realize the function of each functional block.

As shown in FIG. 2, the control device 13 according to the present embodiment includes a heat source system control unit 31, a simulation unit 32, an energy saving operation order calculation unit 33, and an energy saving heat storage and heat release schedule determination unit 34 as functional blocks.
The functions of these functional blocks are incorporated into a program executed by the control device 13, and each functional block is realized by executing the program by the control device 13.

The simulation means 32 calculates a single evaluation function for each heat source unit (first system 1a, second system 1b, and third system 1c) based on the input data, and further minimizes the calculated evaluation function. To calculate the load factor when operating each heat source unit alone.
In this embodiment, the evaluation function is “CO ₂ emissions per heat production (kg−CO ₂ / GJ)”, and the evaluation coefficient of this evaluation function is the CO ₂ emission of consumed energy (electric power, gas, etc.). It is a coefficient.
In this case, the evaluation function of the heat source device (CO ₂ emission amount per heat production amount) is represented by “CO ₂ emission amount / heat production amount”. Further, the coefficient of performance (COP) of the heat source machine is indicated by “heat production / heat consumption”. Therefore, the evaluation function is “CO ₂ emission / (COP × consumed heat consumption)”, and the correlation is established that the smaller the evaluation function, the higher the coefficient of performance (COP).
Therefore, in this embodiment, when the heat source machine is operated so that the evaluation function becomes small, the coefficient of performance (COP) becomes high.

The data input to the simulation means 32 includes CO ₂ emission coefficient, heat demand prediction data, energy charge system, each heat source machine (first system 1a, second system 1b, third system 1c) and utility equipment. It is data indicating device information of the heat source system 1, such as characteristic data and system configuration data. The system configuration data is data that defines the connection relationship between the refrigerator (inverter turbo refrigerator 4a, turbo refrigerator 4b, exhaust heat utilization absorption chiller / heater 4c) and utility equipment in each heat source unit.

FIG. 3A is a diagram showing evaluation functions of refrigerators that differ depending on the format, and FIG. 3B is a diagram showing evaluation functions of refrigerators that differ depending on the season.
For example, the inverter turbo chiller 4a (see FIG. 1) provided in the first system 1a, the turbo chiller 4b (see FIG. 1) provided in the second system 1b, and the exhaust heat utilization absorption chiller / heater provided in the third system 1c. 4c (see FIG. 1) has a different characteristic, and as shown in FIG. 3 (a), the load factor at which the evaluation function is minimized when the wet bulb temperatures of the environments where the respective refrigerators are installed are equal. Is different.
Further, as shown in FIG. 3 (b), the inverter turbo chiller 4a, the turbo chiller 4b, and the exhaust heat utilization absorption chiller / heater 4c are used in the season (especially in the environment where each heat source unit is installed) The evaluation function also varies depending on the wet bulb temperature).

Therefore, the simulation means 32 represents the energy consumption characteristics of each heat source unit as an evaluation function including the energy consumption in the utility facility (for each heat source unit (first system 1a, second system 1b, shown in FIG. 1). Energy consumption characteristics are evaluated for each third system 1c). Therefore, the simulation means 32 includes each refrigerator (inverter turbo refrigerator 4a, turbo refrigerator 4b, exhaust heat utilization absorption chiller / heater 4c) and each heat source machine (first system 1a, second system 1b) including utility facilities. , The third system 1c) is one set for each system. And the simulation means 32 calculates | requires an evaluation function for every one system | strain (heat source machine). In the present embodiment, the simulation means 32 calculates the evaluation function of each heat source device by the following equation (1).

EF = (EP + EPUMP + EFAN) × CEP + EG × CEG (1)

EF: evaluation function _(kg-CO 2 / GJ)
EP: Heat source power consumption (kWh)
EG: Heat source machine gas consumption (m ³ N)
EPUMP: Pump power consumption (kWh)
EFAN: Cooling tower fan power consumption (kWh)
CEP: Power of CO ₂ emission factor _(kg-CO 2 / kWJ)
CEG: CO ₂ emission coefficient of gas (kg-CO ₂ / m ³ N)

Further, as shown in FIG. 3B, the evaluation function of each heat source machine also changes depending on the season (wet bulb temperature). For example, a coefficient corresponding to the wet bulb temperature is set for each heat source unit, and the evaluation function of each heat source unit is a value obtained by multiplying the coefficient corresponding to the wet bulb temperature.
Such a coefficient is preferably set in advance as a design value or a characteristic value of each heat source machine, for example.
As described above, the evaluation function EF calculated by the equation (1) is a function using the load factor (LR) of the heat source unit and the wet bulb temperature (TWB) of the outside air as parameters, as in the following equation (2): Can be represented.

EF = f (LR, TWB) (2)

LR: Load factor of heat source unit (%)
TWB: outside air wet bulb temperature (degrees)

The above-described equation (2) indicates that the evaluation function EF of the heat source device changes according to changes in the load factor (LR) and the wet-bulb temperature (TWB) of the outside air.

As described above, the simulation means 32 of the present embodiment arbitrarily sets the wet bulb temperature, and further changes the load factor of each heat source unit under the set wet bulb temperature, while the equation (1) and Based on the coefficient corresponding to the wet bulb temperature, the evaluation function of each heat source machine (first system 1a, second system 1b, third system 1c) is calculated. Furthermore, the simulation means 32 calculates the control amount of the heat source machine that minimizes the evaluation function.
That is, the simulation unit 32 calculates the load factor of the heat source unit that minimizes the evaluation function while virtually changing the wet bulb temperature and the load factor, and further controls for operating the heat source unit with the load factor. It has a function to calculate quantity.

The energy-saving operation order calculation means 33 sets a priority order for operating each heat source machine (first system 1a, second system 1b, third system 1c), and functions as a priority order setting means.
That is, the energy-saving operation order calculation means 33 generates a necessary heat production amount when each heat source apparatus is operated with the control amount of the heat source apparatus that is calculated by the simulation means 32 and minimizes the evaluation function, and The priority of operation of each heat source machine is set so that the evaluation function of the heat source system 1 is minimized.

The wet-bulb temperature of the outside air and the load factor of the heat source device vary depending on the environment where the heat source system 1 is installed and the operating conditions of the heat source system 1 shown in FIG. For example, when the wet bulb temperature is assumed to be 17 degrees (intermediate period in Tokyo), the heat source system 1 in which a plurality of heat source units are operating does not have an extremely low load.
As an example, the inverter turbo chiller 4a provided in the first system 1a, the turbo chiller 4b provided in the second system 1b, and the exhaust heat utilization absorption chiller / heater 4c provided in the third system 1c are all set to 100 kW, and the inverter turbo It is assumed that the priority of operation is set higher in the order of the refrigerator 4a, the turbo refrigerator 4b, and the exhaust heat utilization absorption chiller / heater 4c.
In this case, when only the inverter turbo chiller 4a is driven when the heat demand of the heat load 8 is 90 kW, the load factor becomes 90%. When the heat demand of the heat load 8 becomes 100 kW and the inverter turbo chiller 4a and the turbo chiller 4b are driven, the load factor becomes 50%.
Therefore, in the operation of the heat source system 1, when the heat demand (load) of the heat source device 8 fluctuates, the load factor can be varied in the range of 50 to 100%.

Further, the energy saving operation order calculation means 33 of the present embodiment calculates the evaluation function EF (f (LR, TWB)) of the heat source unit represented by the equation (1), the wet bulb temperature (TWB) of the outside air, and the load factor. The occurrence frequency P is corrected as shown in the following expression (3).

EF ′ = Σ (f (LR, TWB) × LR × P (LR, TWB))
/ ΣLR (3)

EF ′: Evaluation function of heat source machine (kg-CO ₂ / GJ)
P: Frequency of occurrence of combination of wet air temperature TWB and load factor LR of outside air

The energy saving operation order calculation means 33 compares the magnitudes of the evaluation functions EF ′ of the heat source units represented by the expression (3), and increases the priority of the operation of the heat source units with a small evaluation function EF ′. Set the priority.
In addition, “Σ” in the equation (3) indicates that all the combinations of the wet bulb temperature TWB of the outside air and the load factor LR of the heat source unit are added.

Thus, the evaluation function EF ′ is corrected by the occurrence frequency P of the combination of the wet bulb temperature (TWB) and the load factor (LP) of the outside air, so that the evaluation function EF ′ It can be considered that the evaluation function takes into account the influence of the change in the evaluation function EF according to the above.
For example, when the season of the target day is “summer”, the occurrence frequency P of a combination with a high wet bulb temperature (TWB) and a high load factor (LP) is high.
Such occurrence frequency P is preferably set in advance based on, for example, statistical data indicating the correlation between past weather data (wet bulb temperature) and the load factor of the heat source unit.

The priority order for operating each heat source unit set by the energy saving operation order calculating means 33 is input to the energy saving heat storage and heat radiation schedule determining means 34. When the heat source system 1 (see FIG. 1) is operated according to the heat demand to be processed by the heat source machine with the priority set by the energy saving operation order calculation means 33, the energy saving heat storage and heat radiation schedule determination means 34 The operation schedule (heat storage heat release schedule) for operating each heat source unit is determined so that the overall evaluation function is minimized (that is, the coefficient of performance is maximized). Therefore, the energy-saving heat storage and heat radiation schedule determination unit 34 of this embodiment functions as a schedule determination unit.
The energy saving heat storage and heat radiation schedule determination means 34 is a control amount that minimizes the evaluation function of each heat source machine calculated by the simulation means 32 and a priority order set by the energy saving operation order calculation means 33. An evaluation function relating to energy consumption in the heat source system 1 as a whole is obtained.

FIG. 4 is a diagram showing a change in heat demand and a coefficient of performance of the refrigerator that changes in accordance with the change.
For example, as shown in FIG. 4, when the heat demand at the heat load 8 (see FIG. 1) changes, the coefficient of performance (evaluation function) changes the number of operating heat source units according to the change in heat demand. It changes for each operating number of times.

  As shown in FIG. 4, the coefficient of performance (evaluation function) changes within the range of the change in heat demand where the number of operated heat source machines is the same. The influence of the characteristics of the system 1a, the second system 1b, the third system 1c), the flow rate of the cold water W3, the flow rate of the cooling water (the first cooling water W1a, the second cooling water W1b, the third cooling water W1c); This is because the temperature of the cooling water at the outlets of the cooling towers 5a, 5b, and 5c is managed by the entire heat source system 1 (see FIG. 1). Moreover, the coefficient of performance tends to increase (the evaluation function decreases) as the number of operating heat source machines increases, and the energy saving operation rank calculation means 33 has a small evaluation function (that is, the coefficient of performance increases). This is because the priority order of operating each heat source machine is set so that the priority of the heat source machine becomes higher.

In order to increase the coefficient of performance (COP) in the operation of the heat source system 1 shown in FIG. 1, the amount of CO ₂ emission is reduced, that is, the evaluation function of the entire heat source system 1 in this embodiment is reduced. It is preferable that the heat source system 1 is operated. Therefore, as shown in FIG. 4, the energy saving heat storage and heat radiation schedule determination means 34 of the present embodiment has an evaluation function for each operating number of each heat source machine (first system 1a, second system 1b, third system 1c). Determine the load factor (optimum point) during operation of the heat source machine that is the smallest. For example, the optimal point (load factor) when operating a heat source unit of one system is PA2 and the optimal point (load factor) when operating a heat source unit of PA1 is PA2, when operating a heat source unit of three systems The optimum point (load factor) is PA3.

The optimum point PA1 when operating a heat source unit of one system realizes the evaluation function EF ′ (CO ₂ emission amount) of the heat source unit having the smallest evaluation function EF ′ on the target day (season) This is the load factor when driving the vehicle.
The optimum point PA2 when operating two systems of heat source units is the load factor at which the two systems of heat source units with the smallest minimum evaluation function EF ′ on the target day (season) are the minimum evaluation function EF ′. The total load factor when driving at.
In addition, the optimum point PA3 when operating the heat source units of the three systems is the total when the respective heat source units are operated at the load factor that becomes the minimum evaluation function EF ′ on the target day (season). Load factor.

  In addition, PL1, PL2, and PL3 shown in FIG. 4 are points different from the optimum points that indicate load factors for operating the heat source devices. Details will be described later.

  And the energy-saving heat storage and heat radiation schedule determination means 34 shown in FIG. 2 controls the amount of control so that each heat source machine is operated with the load factor which becomes this optimal point (PA1, PA2, PA3) for every operating number of heat source machines. Control amount for controlling each refrigerator and utility equipment). Furthermore, when each heat source machine is operated in this manner, if the amount of heat produced by the heat source machine is insufficient for the heat demand of the heat load 8 (see FIG. 1), the amount of heat stored in the water storage tank 20 (see FIG. 1). Is used. Specifically, when the amount of heat produced by the heat source unit is insufficient for the heat demand of the heat load 8, the energy saving heat storage and heat radiation schedule determination means 34 drives the heat supply pump 21 (see FIG. 1) to store water in the water tank 20. The cooled cold water W3 is supplied to the heat load 8.

For example, the amount of heat produced by the heat source machine is insufficient for the heat demand of the heat load 8, the amount of cold water W 3 supplied from the water tank 20 to the heat load 8 by the heat supply pump 21, and the water stored in the water tank 20. If the map which shows the relationship with the water temperature of the cold water W3 to be performed is preset, the energy-saving heat storage and heat radiation schedule determination means 34 refers to the map, and the heat production amount in the heat source machine is the heat of the heat load 8 The supply amount of the cold water W3 supplied from the water storage tank 20 to the heat load 8 can be set based on the amount of heat that is insufficient for demand and the water temperature of the cold water W3 stored in the water storage tank 20.
Further, for example, if a map showing the relationship between the supply amount of the cold water W3 supplied from the water tank 20 to the heat load 8 and the rotation speed of the heat supply pump 21 is set in advance, the energy saving heat storage and heat radiation schedule determination means 34 By referring to the map, the rotation speed of the heat supply pump 21 corresponding to the supply amount of the cold water W3 supplied from the water storage tank 20 to the heat load 8 can be set. And the energy-saving heat storage and heat radiation schedule determination means 34 is set to drive the heat supply pump 21 at the set rotational speed.

In addition, what is necessary is just to let the water temperature of the cold water W3 stored by the water storage tank 20 be the temperature of the cooling water in the exit of the heat-source machine currently operated, for example.
As an example, when the heat source unit of the first system 1a is operated by one unit, the temperature of the cold water W3 stored in the water tank 20 is measured by the thermometer 42b at the outlet A2o of the inverter turbo chiller 4a, for example. It is set as the temperature of the 1st cold / hot water W2a.
Further, as an example, when the heat source unit of the first system 1a and the heat source unit of the second system 1b are operated with two units, the temperature of the cold water W3 stored in the water tank 20 is, for example, the inverter turbo chiller 4a The average value of the temperature of the first cold / hot water W2a measured by the thermometer 42b at the outlet A2o and the temperature of the second cold / hot water W2b measured by the thermometer 52b at the outlet B2o of the turbo refrigerator 4b.
Moreover, when the heat source machine of the 1st system | strain 1a, the heat source machine of the 2nd system | strain 1b, and the heat source machine of the 3rd system | strain 1c are operated by three units, the water temperature of the cold water W3 stored in the water storage tank 20 is, for example, The temperature of the first cold / hot water W2a measured by the thermometer 42b at the outlet A2o of the inverter turbo chiller 4a, the temperature of the second cold / hot water W2b measured by the thermometer 52b at the outlet B2o of the turbo chiller 4b, and use of waste heat It is set as the average value of the temperature of the 3rd cold / hot water W2c which the thermometer 62b measures at the exit C2o of the absorption cold / hot water machine 4c.
Or the structure provided with the thermometer (not shown) which measures the water temperature of the cold water W3 in the water storage tank 20 may be sufficient.

For example, as shown in FIG. 4, the energy-saving heat storage and heat release schedule determination unit 34 operates one heat source unit when the heat demand is “H1”, and does not operate the heat source unit when the heat demand is smaller than “H1”. The amount of heat (cold water W3) stored in the water storage tank 20 is set to be supplied to the heat load 8. Moreover, the energy-saving heat storage and heat radiation schedule determination means 34 operates two heat source units when the heat demand is “H2”. When the heat demand is smaller than “H2”, one heat source machine is operated, and the heat quantity deficient in the heat quantity supplied from the heat source machine is obtained by using the heat quantity (cold water W3) stored in the water storage tank 20 as the heat load 8. Set to supplement and supply. Moreover, the energy-saving heat storage and heat radiation schedule determination means 34 operates three heat source machines when the heat demand is “H3”. When the heat demand is smaller than “H3”, two heat source machines are operated, and the heat quantity deficient in the heat quantity supplied from the heat source machine is obtained by using the heat quantity (cold water W3) stored in the water storage tank 20 as the heat load 8. Set to supplement and supply.
That is, the energy-saving heat storage and heat radiation schedule determination means 34 is set so as to absorb the difference between the heat production amount in the heat source machine and the heat demand in the heat load 8 by using the heat storage stored in the water tank 20.

  However, when each heat source machine is operated at the optimum point (PA1, PA2, PA3) that minimizes the evaluation function, the operable range of each heat source machine is narrow, and the heat load is based on the amount of heat stored in the water tank 20. The shortage of heat demand of 8 may not be supplemented.

Therefore, the energy saving heat storage and heat release schedule determination means 34 has the highest coefficient of performance for the load factor of each heat source machine, apart from the optimal point (PA1, PA2, PA3) where the evaluation function is the smallest and the coefficient of performance (COP) is the highest. It is good also as a structure which extracts the point (low load point) smaller than the load factor which becomes high.
For example, the energy-saving heat storage / heat-release schedule determining means 34 uses a low load point with a load factor that is smaller by a predetermined rate (for example, 10%) than the load factor that is the optimum point at which the evaluation function is the smallest in each heat source unit. Set a new one for each.
Note that the above-described value of “10%” for setting the low load point is an example, and is not limited to this value. This value may be a design value set based on, for example, the configuration of the heat source system 1 or the required performance.

And the energy-saving heat storage and heat radiation schedule determination means 34 makes the load factor when operating one heat-source unit by the newly set load factor the low load point PL1 shown in FIG. Further, the energy saving heat storage and heat radiation schedule determination means 34 sets the total load factor when the two heat source units are operated at the newly set load factor as the low load point PL2 shown in FIG. Furthermore, the energy saving heat storage and heat radiation schedule determination means 34 sets the total load factor when operating the three heat source units at the newly set load factors as the low load point PL3 shown in FIG.
Thus, the energy-saving heat storage and heat radiation schedule determination means 34 is based on the six load factors of the load factor that is the optimum point (PA1, PA2, PA3) and the load factor that is the low load point (PL1, PL2, PL3). Select the load factor when operating the heat source unit.

FIG. 5 shows a procedure by which the energy saving heat storage and heat release schedule determination means calculates an operation schedule (heat storage heat release schedule) for operating the heat source system by operating the heat source device at a load factor selected from the optimum point and the low load point. It is a flowchart.
The energy saving heat storage and heat radiation schedule determination means 34 calculates the heat storage heat radiation schedule at intervals of 2 hours from 0:00 to 23:00, for example, according to the procedure shown in FIG.
In addition, the time interval which the energy-saving heat storage and heat radiation schedule determination means 34 calculates a heat storage and heat radiation schedule is not limited to 2 hours. A configuration in which the heat storage and heat release schedule is calculated at a time interval of 2 hours or less may be used, or a configuration in which the heat storage and heat release schedule is calculated at a time interval of 2 hours or more may be used.

  In addition, the energy-saving heat storage and heat radiation schedule determination means 34 should just be comprised so that the heat storage heat radiation schedule for one day may be calculated, for example at the time decided every day (such as 0:00).

When the energy saving heat storage and heat release schedule determination unit 34 starts calculation of the heat storage and heat release schedule, the heat storage time and heat release time are set based on the data (heat demand prediction data) predicting the transition of the heat demand (step S1).
In addition, the heat demand prediction data is, for example, data in which a change in heat demand for each hour is predicted based on changes in heat demand for the same period in the past.
At this time, the energy-saving heat storage and heat radiation schedule determination means 34 sets a heat storage time zone in a time zone where the heat demand is predicted to be small (for example, at night), and heat radiation time zone in a time zone where the heat demand is predicted to be large (for example, in the daytime). Is preferably set.

Next, the energy-saving heat storage and heat radiation schedule determination means 34 calculates the average value ALOAD for every unit time of a heat demand (step S2). The unit time referred to here is a time interval at which the energy saving heat storage and heat radiation schedule determining means 34 calculates the heat storage and heat radiation schedule. For example, when the energy saving heat storage and heat radiation schedule determination means 34 is configured to calculate a heat storage heat radiation schedule at intervals of 2 hours, the unit time is 2 hours.
The energy saving heat storage and heat release schedule determination means 34 sets the average value per unit time of the heat demand indicated by the heat demand prediction data as the average value ALOAD per unit time of the heat demand. The average value ALOAD calculated in this way is a measure of heat demand when the energy saving heat storage and heat radiation schedule determination means 34 calculates the heat storage heat radiation schedule.

Moreover, the energy-saving heat storage and heat radiation schedule determination means 34 sets the target value (heat storage operation target value STL) when the heat source system 1 performs heat storage operation and the target value (heat radiation operation target value RTL) when the heat source system 1 performs heat radiation operation. Set (step S3). The energy saving heat storage and heat radiation schedule determining means 34 sets the heat storage operation target value STL and the heat radiation operation target value RTL to the optimum point (PA1, PA2, PA3) or the low load point (PL1, PL2, PL3).
For example, when the energy saving heat storage and heat radiation schedule determination means 34 first sets the heat storage operation target value STL and the heat radiation operation target value RTL, the amount of heat produced when one heat source unit is operated at the load factor of the optimum point PA1. Is set to the heat storage operation target value STL and the heat radiation operation target value RTL.
As described above, the state in which the heat production amount when one heat source unit is operated at the load factor of the optimum point PA1 is set to the heat storage operation target value STL and the heat radiation operation target value RTL is described below as (STL: PA1 , RTL: PA1).

Moreover, the energy-saving heat storage and heat radiation schedule determination means 34 sets the target time (step S4), and the set time is the time of the heat radiation operation time zone (heat radiation time zone) or the time zone of heat storage operation (heat storage time zone). ) (Step S5). In step S4, the energy-saving heat storage and heat radiation schedule determination means 34 sets an arbitrary time of the day (0 to 23:00). For example, the energy saving heat storage and heat radiation schedule determination means 34 sets “0:00” when setting the time for the first time.
And when the set time is the heat storage time zone set as described above, the energy saving heat storage and heat radiation schedule determination means 34 determines that the heat storage operation time is set (step S5 → Yes), and other times (heat radiation time zone). In this case, it is determined that it is time to perform a heat radiation operation (step S5 → No).

  When the set time is the heat storage time zone (step S5 → Yes), the energy saving heat storage heat release schedule determination unit 34 is configured to store the heat production amount SUPPLYHEAT per unit time, the heat storage amount SHEAT, and the remaining heat storage amount (heat storage). Rate RATIO) is calculated (step S6). On the other hand, when the set time is the heat release time zone (step S5 → No), the energy saving heat storage heat release schedule determining means 34 is configured to generate the heat production amount SUPPLYHEAT per unit time, the heat release amount RHEAT, and the remaining heat storage amount (heat storage). Rate RATIO) is calculated (step S7).

In step S6, the energy saving heat storage and heat radiation schedule determination means 34 calculates the heat production amount SUPPLYHEAT, the heat storage amount SHEAT, and the heat storage rate RATIO by the following equations (4) to (6).

SUPPLYHEAT = STL (4)
SHEAT = SUPPLYHEAT-LOAD (5)
RATIO =
((RATIO ″ × SCAP + SHEAT) / SCAP) × 100 (6)

LOAD: Heat demand of heat load RATIO '': Heat storage rate calculated for the previous time SCAP: Heat storage capacity of the water tank

The energy saving heat storage and heat radiation schedule determination means 34 uses the average value ALOAD calculated in step S2 as a measure of the heat demand (LOAD) of the heat load 8. For example, when the heat storage amount of the water storage tank 20 predicted from the heat demand prediction data is large at the time set in step S4, the energy saving heat storage and heat radiation schedule determination means 34 is in a unit time including the time so that the heat storage does not become excessive. A value lower than the average value ALOAD is set as the heat demand (LOAD) of the heat load 8 at that time. For example, when it is predicted that the amount of heat stored in the water storage tank 20 is greater than a predetermined upper limit threshold, the energy saving heat storage and heat release schedule determination means 34 is a value obtained by multiplying the average value ALOAD by a predetermined decrease rate (a1%: a1 <100). Let “ALOAD × a1 / 100” be the heat demand (LOAD) of the heat load 8.
The predetermined upper limit threshold and the predetermined decrease rate (a1) may be set as design values set by the configuration of the heat source system 1 or the like, for example.

Moreover, when the heat storage amount of the water storage tank 20 predicted from the heat demand prediction data is small at the time set in step S4, the energy saving heat storage heat radiation schedule determination means 34 includes the unit time including the time so that the heat storage does not become excessively small. A value higher than the average value ALOAD at is set as the heat demand (LOAD) of the heat load 8. For example, when it is predicted that the heat storage amount of the water storage tank 20 is less than a predetermined lower threshold, the energy saving heat storage and heat radiation schedule determination means 34 is a value obtained by multiplying the average value ALOAD by a predetermined increase rate (a2%: a2> 100). Let “ALOAD × a2 / 100” be the heat demand (LOAD) of the heat load 8.
The predetermined lower limit threshold and the predetermined increase rate (a2) may be set as design values set by the configuration of the heat source system 1 and the like, for example.

On the other hand, when the set time is the heat release time zone (step S5 → No), the energy saving heat storage heat release schedule determination means 34 uses the following formulas (7) to (9) in step S7 to calculate the heat production amount SUPPLYHEAT and the heat release amount RHEAT. The heat storage rate RATIO is calculated.

SUPPLYHEAT = RTL (7)
RHEAT = LOAD-SUPPLYHEAT (8)
RATIO =
((RATIO ″ × SCAP-RHEAT) / SCAP) × 100 (9)

The energy saving heat storage and heat radiation schedule determination means 34 sets the average value ALOAD in the unit time including the time set in step S4 as the heat demand (LOAD) of the heat load 8. However, when the set time is the heat release time zone, the energy saving heat storage heat release schedule determination means 34 sets a value lower than the average value ALOAD to the heat load 8 in consideration that the energy charge such as the power charge is a high time zone. It is good also as a structure set as the heat demand (LOAD). For example, the energy saving heat storage and heat release schedule determination means 34 sets the value “ALOAD × a3 / 100” obtained by multiplying the average value ALOAD by a predetermined reduction rate (a3%: a3 <100) as the heat demand (LOAD) of the heat load 8. .
The predetermined reduction rate (a3) in this case may be a value set by, for example, the energy fee (electricity fee) at the time obtained from the data indicating the energy fee system, the configuration of the heat source system 1, and the like.

When the heat storage rate RATIO of the water storage tank 20 exceeds “1” in the heat storage time zone, the energy saving heat storage and heat radiation schedule determination unit 34 calculates the heat storage heat radiation schedule so as to end the heat storage operation. At that time, the energy saving heat storage and heat radiation schedule determination means 34 calculates the heat storage time (STIME) and the heat storage amount (heat storage rate RATIO) by the following equations (10) to (12).

SHEAT '=
SHEAT-SCAP × (RATIO-100) / 100 (10)
STIME = (SHEAT '/ SHEAT) × 100 (11)
RATIO '= 100 (12)

SHEAT ': Recalculated heat storage amount RATIO': Recalculated heat storage rate

  When the time set in step S4 is not the last time of the day (for example, 22:00) (step S8 → No), the energy-saving heat storage and heat radiation schedule determination means 34 returns the procedure to step S4. On the other hand, when the set time is the final time (step S8 → Yes), the energy saving heat storage and heat radiation schedule determination means 34, when the heat storage rate for all times is “0” or more and “1” or less (step S9 → Yes), the calculation of the heat storage and heat release schedule is terminated. On the other hand, when the heat storage rates at all times are not less than “0” and not “1” (step S9 → No), the energy saving heat storage and heat radiation schedule determination means 34 returns the procedure to step S3 and calculates the heat storage heat radiation schedule. .

  For example, when the unit time is 2 hours, the energy saving heat storage and heat radiation schedule determination means 34 executes the procedure from step S4 to step S8 12 times to calculate the daily heat storage heat radiation schedule.

  When the procedure is returned to step S3, the energy saving heat storage and heat radiation schedule determining means 34 determines the heat production amount when the heat source unit of one system is operated at the load factor of the optimum point PA1 and the heat storage operation target value STL and the heat radiation operation target value. When RTL is set, that is, when (STL: PA1, RTL: PA1), the heat storage operation target value STL is left as it is, and one heat source unit is operated at the load factor of the low load point PL1. Is set to the heat radiation operation target value RTL. That is, the energy saving heat storage and heat radiation schedule determination means 34 is set to the state of (STL: PA1, RTL: PL1).

  Furthermore, when the procedure is returned to step S3, the energy-saving heat storage / heat-release schedule determination means 34 is set to the state of (STL: PA1, RTL: PL1), and the heat storage operation target value STL is left as it is. The heat production amount when the heat source unit is operated at the load factor of the optimum point PA2 (referred to as the heat production amount at the optimum point PA2, hereinafter the same applies to other optimum points and low load points). Set to RTL. That is, the energy saving heat storage and heat radiation schedule determination means 34 is set to the state of (STL: PA1, RTL: PA2).

In this way, each time the procedure is returned to step S3, the energy saving heat storage and heat radiation schedule determination means 34 reduces the heat radiation operation target value RTL from the heat production amount at the optimum point PA1 to a low load while keeping the heat storage operation target value STL constant. Change the amount of heat production at point PL3. That is, the energy-saving heat storage and heat radiation schedule determination unit 34 changes the state from (STL: PA1, RTL: PA1) to the state (STL: PA1, RTL: PL3).
In the meantime, when the heat storage rate at all times is not less than “0” and not more than “1” (step S9 → Yes), the energy saving heat storage and heat radiation schedule determination means 34 ends the calculation of the heat storage heat radiation schedule. Then, the heat storage operation target value STL and the heat radiation operation target value RTL at each time when the heat storage rate at all times is equal to or greater than “0” and equal to or less than “1” are set as the operation target (heat production amount) at each time. And

On the other hand, when the heat storage rate at all times is not less than “0” and not less than “1” while the heat radiation operation target value RTL changes up to the heat production amount at the low load point PL3 (step S9 → No), energy saving heat storage When the procedure is returned to step S3, the heat radiation schedule determining means 34 sets the heat storage operation target value STL to the heat production amount at the low load point PL1, and the heat radiation operation target value RTL is the heat production amount at the optimum point PA1. Set to. That is, the energy saving heat storage and heat radiation schedule determination means 34 is set to the state of (STL: PL1, RTL: PA1).
Then, the energy saving heat storage and heat radiation schedule determining means 34 changes the heat radiation operation target value RTL from the heat production amount at the optimum point PA1 to the low load point until the heat storage rate at all times becomes “0” or more and “1” or less. Change the amount of heat production at PL3.
In the meantime, when the heat storage rate at all times becomes “0” or more and “1” or less (step S9 → Yes), the energy saving heat storage and heat radiation schedule determining means 34 ends the calculation of the heat storage heat radiation schedule. Then, the heat storage operation target value STL and the heat radiation operation target value RTL at each time when the heat storage rate at all times is equal to or greater than “0” and equal to or less than “1” are set as the operation target (heat production amount) at each time. And

Thus, the energy saving heat storage and heat radiation schedule determination means 34 sequentially changes the heat storage operation target value STL and the heat radiation operation target value RTL from the heat production amount at the optimum point PA1 to the heat production amount at the low load point PL3. That is, the energy-saving heat storage and heat radiation schedule determination means 34 sequentially changes from the state (STL: PA1, RTL: PA1) to the state (STL: PL3, RTL: PL3), and the heat storage rate at all times is “0” during that time. When the value is equal to or greater than “1” (step S9 → Yes), the calculation of the heat storage and heat release schedule ends.
Then, the heat storage operation target value STL and the heat radiation operation target value RTL at each time when the heat storage rate at all times is equal to or greater than “0” and equal to or less than “1” are set as the operation target (heat production amount) at each time. And
In addition, even if it changes to the state of (STL: PL3, RTL: PL3), if the heat storage rate at all times is not less than “0” and not “1” (step S9 → No), the energy saving heat storage heat release schedule determination means 34 sets the heat storage operation target value STL and the heat dissipation operation target value RTL to the heat production amount at the low load point PL3, respectively. That is, the state is (STL: PL3, RTL: PL3).

In this way, the energy-saving heat storage and heat radiation schedule determination means 34 is a combination of the heat production amount set to the heat storage operation target value STL and the heat radiation operation target value RTL each time the procedure is returned to step S3, that is, the optimum point (PA1, PA2 , PA3) and the combination of the low load points (PL1, PL2, PL3) are sequentially changed to execute step S4 and subsequent steps.
Then, when the heat storage rate at all times becomes “0” or more and “1” or less (step S9 → Yes), the energy-saving heat storage and heat radiation schedule determination unit 34 sets the heat storage operation target value STL and the heat radiation operation target value RTL. The operation target value (heat production amount) of the heat source machine is used.

As mentioned above, the energy-saving heat storage and heat radiation schedule determination means 34 calculates a heat storage and heat radiation schedule in the procedure shown in the flowchart shown in FIG.
Then, the energy-saving heat storage and heat radiation schedule determination means 34 uses the heat storage operation target value STL and the heat radiation operation target value RTL when the heat storage rate RATIO at all times is not less than “0” and not more than “1” as the heat source at each time. The target value (heat production amount) for machine operation is determined. Then, the energy saving heat storage and heat radiation schedule determination means 34 notifies the heat source system control means 31 of the determined heat storage operation target value STL and heat dissipation operation target value RTL.
The heat source system control means 31 is a control amount for controlling each heat source machine (first system 1a, second system 1b, third system 1c) based on the notified heat storage operation target value STL and heat radiation operation target value RTL. Further, the heat source device is controlled with the calculated control amount. That is, in this embodiment, the heat source system control means 31 functions as an operation control means for operating the heat source machine.

FIG. 6 is a diagram illustrating an example of the transition of the heat demand and the heat storage operation target value STL and the heat radiation operation target value RTL determined in response thereto.
For example, when a change in heat demand is predicted as shown by a solid line in FIG. 6, based on the change in heat demand, the heat storage operation target value STL and the heat release operation target value RTL are saved as shown by a broken line. It is determined by the determining means 34 (see FIG. 2).
The energy saving heat storage and heat radiation schedule determination means 34 sets the time before time T1 and after time T2 as the heat storage time zone, and sets the time between time T1 and time T2 as the heat release time zone. And the energy-saving thermal storage heat radiation schedule determination means 34 sets the thermal storage operation target value STL of the thermal storage time zone as the low load point PL2 when operating the two heat source machines.
In the heat storage time zone, the heat source system control means 31 operates two systems of heat source machines, which are set with high priority for operation, at the load factor of the low load point PL2.
In the heat storage time zone, the amount of heat indicated by diagonal lines is stored in the water storage tank 20 (see FIG. 1) by the operation of the heat source machine.

  Although FIG. 6 shows an example in which all the heat storage operation target values STL in the heat storage time period are set to be equal, this is not limited. Even in the heat storage time zone, the heat storage operation target value STL may differ from time to time.

The energy-saving heat storage and heat radiation schedule determination means 34 operates, for example, the heat radiation operation target value RTL between time T1 and time T11 at the optimum point PA1 in the heat radiation time zone (time T1 to T2). The heat release target value RTL between time T11 and time T12 is set to the heat production amount when the two heat source machines are operated at the optimum point PA2.
Further, the energy-saving heat storage and heat radiation schedule determining means 34 sets the heat radiation operation target value RTL between the time T12 and the time T13 to the heat production amount when the three heat source machines are operated at the low load point PL3, and the time T13. Is set to the heat production amount when the two heat source machines are operated at the optimum point PA2.
Furthermore, the energy-saving heat storage and heat radiation schedule determination unit 34 sets the heat radiation operation target value RTL between the time T15 and the time T2 to the heat production amount when operating one heat source unit at the optimum point PA1.

From time T1 to time T11, the heat source system control means 31 operates one system of heat source machines set with the highest priority of operation at the load factor of the optimum point PA1, and from time T11 to time T12. The two heat source machines set with high priority of operation are operated at the load factor of the optimum point PA2.
Further, the heat source system control means 31 operates the three heat source units at the load factor of the low load point PL3 from time T12 to time T13, and the operation priority is set high from time T13 to time T15. The two heat source machines are operated at the load factor of the optimum point PA2.
Further, the heat source system control means 31 operates one system of heat source machines set with the highest priority of operation from time T15 to time T2 at the load factor of the optimum point PA1.

In the heat radiation time zone (time T1 to T2), the heat amount corresponding to the heat production amount generated by the operation of the heat source machine is supplied to the heat load 8 (see FIG. 1) and consumed as heat demand. Furthermore, the control device 13 controls the heat source system 1 so that the amount of heat that the heat production amount is insufficient for the heat demand is supplemented by the amount of heat (water tank heat radiation amount) supplied from the water tank 20 (see FIG. 1).
Specifically, as described above, the control device 13 (see FIG. 1) determines the supply amount of the cold water W3 such that the heat production amount is insufficient for the heat demand and is supplied from the water tank 20 to the heat load 8. Further, the heat supply pump 21 (see FIG. 1) is controlled so that the cold water W3 is supplied from the water storage tank 20 to the heat load 8 with the determined supply amount.

  The heat load 8 (see FIG. 1) includes the amount of heat generated by the operation of the heat source machine (corresponding to the heat production amount) and the amount of heat stored in the water storage tank 20 (see FIG. 1) (corresponding to the heat storage tank heat radiation amount). And are consumed as heat demand.

As described above, the heat source system 1 according to the present embodiment includes the three systems of heat source units of the first system 1a, the second system 1b, and the third system 1c, as shown in FIG. And the control apparatus 13 with which the heat source system 1 is equipped sets the priority which operates a heat source machine so that the coefficient of performance (COP) of the heat source system 1 may become the highest according to the change of a heat demand, the wet bulb temperature of external air, etc. Set.
Further, the control device 13 is configured so that the coefficient of performance (COP) of the entire heat source system 1 becomes the highest based on the set priority order of the heat source units and the heat demand prediction data in which the change in the heat demand is predicted. An operation schedule (heat storage and release schedule) for operating the heat source system 1 (three systems of heat source devices) is determined. Furthermore, the control device 13 operates the three heat source machines based on the determined heat storage and heat release schedule.

With such a configuration, it is possible to operate the heat source system 1 including three heat source machines with a high coefficient of performance.
That is, the heat source system 1 of the present embodiment can determine the heat storage and heat release schedule for operating the heat source system 1 based on the heat demand prediction data, and has a high coefficient of performance corresponding to the change in the heat demand of the heat load 8. It becomes possible to drive while maintaining.

In addition, this invention is not limited to an above described Example and modification. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
Also, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment.

For example, the heat source device is not limited to three systems, and the present invention can be applied to the heat source system 1 (see FIG. 1) including four or more heat source devices.
In this case, the control device 13 is configured to calculate the evaluation function EF ′ for all the heat source units according to the equation (3), and to set the operation priority order of the heat source units in ascending order of the evaluation function EF ′. That's fine.

Further, in this embodiment, one low load point is set for each heat source unit, and three low load points (PL1, PL2, PL3) are set by three heat source units. However, it is good also as a structure which sets the low load point of 2 or more points to each heat source machine.
Or it is good also as a structure which sets the load factor which operates each heat source machine based on the optimal point (PA1, PA2, PA3), without setting a low load point.

Further, in this embodiment, the energy saving heat storage and heat radiation schedule determination means 34 is configured to calculate a heat storage heat radiation schedule for one day at a predetermined time (such as 0:00) every day. However, this configuration is not limited.
For example, the energy saving heat storage and heat radiation schedule determination means 34 may be configured to calculate a heat storage heat radiation schedule for one month at a fixed time (such as 0:00) on a fixed day (such as one day) every month.
In the case of this configuration, it is preferable that the energy saving heat storage and heat radiation schedule determination means 34 is configured to repeat the procedure shown in the flowchart of FIG. 5 for one month.

  In addition, the present invention is not limited to the above-described embodiments, and appropriate design changes can be made without departing from the spirit of the invention.

1 Heat source system 1a 1st system (heat source machine)
1b Second system (heat source machine)
1c 3rd system (heat source machine)
4a Inverter turbo refrigerator (refrigerator)
4b Turbo refrigerator (refrigerator)
4c Absorption heat absorption chiller / heater (refrigerator)
13 Control device 20 Water storage tank (heat storage tank)
21 Heat supply pump 31 Heat source system control means (operation control means)
32 Simulation means 33 Energy saving operation order calculation means (priority order setting means)
34 Energy saving heat storage and heat release schedule determination means (schedule determination means)
W3 cold water

Claims (8)

At least two systems of heat source equipped with a refrigerator;
Simulation means for calculating a coefficient of performance for each heat source unit,
In order of the heat source machine having the highest coefficient of performance, priority setting means for setting a higher priority for operation;
Schedule determination means for determining an operation schedule so as to be operated first from the heat source unit having a higher priority set based on prediction of a change in heat demand due to heat load;
Operation control means for operating the heat source unit based on the operation schedule;
The priority order setting means further sets the priority order based on the frequency of occurrence of a combination of a wet bulb temperature of outside air and a load factor of the heat source unit . A heat storage tank for storing the amount of heat produced by the heat source device;
The schedule determination means includes
The heat source machine is operated at a predetermined load factor including a load factor at which the coefficient of performance becomes the highest,
2. The heat source according to claim 1, wherein the operation schedule is determined so as to absorb a difference between a heat production amount of the heat source device and a heat demand at the heat load using heat storage of the heat storage tank. system. The schedule determination means includes
A heat release time zone in which the heat demand is generated by the heat load,
The operation schedule so as to operate the heat source unit at a predetermined load factor including a load factor at which the coefficient of performance is maximized in each of a heat storage time zone in which the heat produced by the heat source unit is stored in the heat storage tank. The heat source system according to claim 2, wherein the heat source system is determined.   The heat source system according to claim 2, wherein the heat storage tank is a water storage tank for storing cold water cooled by the heat source device.   The heat storage system according to claim 3, wherein the heat storage tank is a water storage tank that stores cold water cooled by the heat source apparatus. A heat supply pump for supplying the cold water stored in the water tank to the heat load;
The heat source system according to claim 4 or 5, wherein the heat supply pump is configured to be capable of adjusting a supply amount of the cold water supplied to the heat load.   The said schedule determination means determines the said operation schedule based on the prediction data which predicted the change of the said heat demand preset, The any one of Claims 1 thru | or 5 characterized by the above-mentioned. Heat source system.   The heat source system according to claim 6, wherein the schedule determination unit determines the operation schedule based on prediction data that is set in advance and predicts a change in the heat demand.

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