JP7474286B2 - Air-conditioning heat source control device, air-conditioning heat source control method, and air-conditioning heat source control program - Google Patents

Description

The present invention relates to an air conditioning heat source control device, an air conditioning heat source control method, and an air conditioning heat source control program.

Conventionally, there is known an air conditioning control system that controls the opening of a cold water valve provided in a cold water supply passage to a cold water coil and the opening of a cold/hot water valve provided in a cold/hot water supply passage to a cold/hot water coil (Patent Document 1). In this air conditioning control system, the air conditioning control device determines a valve opening command value by calculating an indoor temperature control output value that makes the deviation between the indoor temperature measurement value measured by the indoor temperature sensor and the indoor temperature set value zero, calculates a valve opening command value that makes the deviation between the return water temperature measurement value measured by the return water temperature sensor and the return water temperature set value zero, and compares the opening command value based on the indoor temperature measurement value and the opening command value based on the return water temperature measurement value for each valve, and selects the opening command value that indicates the smaller opening value as the actual opening command value. This air conditioning control system suppresses excessive flow of cold water to the cold/hot water coil and the cold water coil.

In addition, an air conditioning system is known that includes an intake air duct through which the intake air flows, a heat source unit that generates chilled water, and a heat exchange unit that can cool the intake air flowing through the intake air duct by exchanging heat with the chilled water, and that provides appropriate air conditioning in response to fluctuations in the cooling load (Patent Document 2). This air conditioning system uses low-temperature chilled water and medium-temperature chilled water to save energy.

JP 2013-204889 A JP 2019-124396 A

In addition, in central air conditioning systems that centrally control multiple air conditioners in a central control room, it is common to supply only chilled water as a heat transfer medium to the air conditioners during cooling operations, but in recent years, technology has been known that utilizes two heat transfer media, chilled water and medium-temperature chilled water, to improve energy conservation. Here, if the chilled water temperature is fixed and the medium-temperature chilled water temperature is variable, the selection of the medium-temperature chilled water temperature may not be optimal from the perspective of energy conservation. In other words, if the temperature of the medium-temperature chilled water is too high, it may result in a situation where only a small amount of medium-temperature chilled water is used, and the energy-saving effect may not be fully secured. Also, if the temperature of the medium-temperature chilled water is too low, energy savings may be inferior.

The present invention has been made in consideration of the above circumstances, and aims to provide an air conditioning heat source control device, an air conditioning heat source control method, and an air conditioning heat source control program that can determine the temperature of the medium-temperature chilled water produced by a heat source machine so that the heat source machine operates optimally.

To achieve the above object, the air conditioning heat source control device according to the first invention includes a weather information acquisition unit that acquires weather information for a prediction target period, a heat demand prediction unit that predicts the heat demand of the air conditioner for the prediction target period based on the weather information, and a chilled water demand prediction unit that predicts, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water of that temperature and the demand for chilled water with a temperature lower than that of the medium-temperature chilled water that will satisfy the heat demand.

According to the air conditioning heat source control device of the first invention, the weather information acquisition unit acquires weather information for the prediction period. The heat demand prediction unit predicts the heat demand of the air conditioner for the prediction period based on the weather information. The chilled water demand prediction unit predicts, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water of that temperature and the demand for chilled water with a temperature lower than that of the medium-temperature chilled water that will satisfy the heat demand.

In this way, by predicting the demand for medium-temperature chilled water at each temperature of medium-temperature chilled water that satisfies the heat demand, and the demand for chilled water at a temperature lower than that of the medium-temperature chilled water, it is possible to determine the temperature of the medium-temperature chilled water produced by the heat source machine so that the heat source machine operates optimally.

In addition, in the air conditioning heat source control method according to the second invention, a weather information acquisition unit acquires weather information for a prediction target period, a heat demand prediction unit predicts the heat demand of the air conditioner for the prediction target period based on the weather information, and a chilled water demand prediction unit predicts, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water of that temperature and the demand for chilled water with a temperature lower than that of the medium-temperature chilled water that will satisfy the heat demand.

The air conditioning heat source control program according to the third invention is a program that causes a computer to acquire weather information for a prediction period, predict the heat demand of an air conditioner for the prediction period based on the weather information, and predict, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water of that temperature and the demand for chilled water with a temperature lower than that of the medium-temperature chilled water that will satisfy the heat demand.

As described above, the air conditioning heat source control device, air conditioning heat source control method, and air conditioning heat source control program of the present invention can predict, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water at that temperature and the demand for chilled water at a temperature lower than that of the medium-temperature chilled water that satisfies the heat demand, thereby achieving the effect of determining the temperature of the medium-temperature chilled water produced by the heat source machine so as to optimize operation of the heat source machine.

1 is a block diagram showing an air conditioning heat source control system according to an embodiment of the present invention. 1 is a diagram for explaining a method of supplying chilled water and medium-temperature chilled water from a heat source unit to an air conditioner. FIG. FIG. 2 is a block diagram showing a configuration of a server according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a psychrometric chart. FIG. 13 is a diagram showing a display example. 5 is a flowchart showing the contents of an air-conditioning heat source control processing routine in the server according to the embodiment of the present invention. 11 is a graph showing the relationship between medium-temperature chilled water temperature and total input energy.

The following describes an embodiment of the present invention with reference to the drawings.

<System configuration of air conditioning heat source control system>
As shown in FIG. 1, an air conditioning heat source control system 100 according to an embodiment of the present invention includes a server 10 provided on the energy center side, a plurality of heat source units 20A, 20B, control devices 22A, 22B provided for each of the heat source units 20A, 20B, a plurality of air conditioners 30A, 30B, and control devices 32A, 32B provided for each of the air conditioners 30A, 30B.

The air conditioning heat source control system 100 is installed, for example, in the same city block. The control devices 22A, 22B and the server 10 are connected to each other via a network N such as a LAN or the Internet. The server 10 is an example of an air conditioning heat source control device. In addition, there may be three or more heat source machines, and there may be one air conditioner or three or more air conditioners.

The heat source unit 20A is a heat source unit that produces chilled water, for example a chiller (such as a turbo chiller) that produces chilled water.

The heat source unit 20B is a heat source unit that produces medium-temperature chilled water, for example a chiller (such as a turbo chiller) that produces medium-temperature chilled water.

The energy production efficiency (COP) of heat source unit 20B is higher than that of heat source unit 20A. This is because heat source unit 20B produces cold water at a higher temperature and can operate with high efficiency.

As shown in FIG. 2, a water heat storage tank 24 is provided between the heat source units 20A and 20B and the air conditioners 30A and 30B. Note that the water heat storage tank 24 may not be provided.

In addition, auxiliary equipment may include a cooling tower and a cold water pump, a cooling water pump, a heat exchanger, and a cold water supply pump that transports the heat transfer medium to the building side.

The air conditioners 30A and 30B have any one of the following configurations (1) and (2).
(1) Double coil models that use chilled water and medium temperature chilled water and chilled water circulation pumps. (2) Single coil models that use only chilled water or only medium temperature chilled water (sensible and latent separate air conditioning) and chilled water circulation pumps.

Each of the control devices 22A and 22B controls the operation of the heat source units 20A and 20B to which it is connected.

Each of the control devices 32A and 32B controls the operation of the connected air conditioners 30A and 30B.

The server 10 predicts the demand for medium-temperature chilled water and chilled water at a specified temperature, determines an operation plan for each heat source unit 20A, 20B and each air conditioner 30A, 30B so that chilled water is used after the medium-temperature chilled water is used up, and transmits operation commands according to the operation plan to each control device 22A, 22B, 32A, 32B.

Specifically, as shown in FIG. 3, the server 10 includes a communication unit 50 and a calculation unit 52. The calculation unit 52 includes a weather information acquisition unit 54, a heat demand prediction unit 56, a chilled water demand prediction unit 58, an energy amount calculation unit 60, a display unit 62, a medium-temperature chilled water temperature determination unit 64, and an operation command output unit 66.

The communication unit 50 receives weather information, building information, personnel information, past performance, equipment specifications, equipment characteristics, and event information for each heat source unit 20A, 20B and each air conditioner 30A, 30B. The communication unit 50 transmits operation commands to the control devices 22A, 22B of each heat source unit 20A, 20B and the control devices 32A, 32B of each air conditioner 30A, 30B.

The weather information acquisition unit 54 acquires weather information for the prediction target period (e.g., the next day).

The heat demand prediction unit 56 predicts the heat demand of the air conditioners for the prediction period based on the weather information for the prediction period. Specifically, the heat demand for the prediction period is predicted based on the accumulated results of the time change in heat demand for each heat source unit 20A, 20B and each air conditioner 30A, 30B and the weather information for the prediction period (e.g., the next day). The prediction span is a short span, for example, in units of hours. More specifically, the heat demand for the previous day is corrected based on the weather information, building information, event information, and unused energy amount in the town for the prediction period, and the predicted value is obtained.

The chilled water demand prediction unit 58 predicts, for each temperature of medium-temperature chilled water, the demand for medium-temperature chilled water of that temperature and the demand for chilled water with a temperature lower than that of the medium-temperature chilled water that satisfies the predicted value of heat demand.

Specifically, for each temperature of medium-temperature chilled water, the chilled water demand prediction unit 58 predicts the demand for medium-temperature chilled water at that temperature based on the inlet temperature of the medium-temperature chilled water coil, the outlet temperature of the medium-temperature chilled water coil determined according to the temperature of the medium-temperature chilled water, and the air flow rate of the medium-temperature chilled water coil, and predicts the demand for chilled water as the difference between the predicted heat demand and the predicted demand for medium-temperature chilled water at that temperature.

More specifically, the demand for medium-temperature chilled water A is calculated according to the medium-temperature chilled water temperature B according to the following formula:

Demand for medium-temperature chilled water A = temperature difference between the air inlet and outlet of the heat exchanger between air and medium-temperature chilled water [℃] x air flow rate [kg/s] x specific heat of air [kJ/(kg・℃)]

The air temperature at the heat exchanger outlet is calculated from the air conditioner characteristics and the medium temperature chilled water temperature B. From the above, the demand for medium temperature chilled water A can be calculated from the specific heat of the air, the flow rate, the air temperature at the heat exchanger inlet, and the medium temperature chilled water temperature B.

The demand for chilled water C is calculated from the difference between the predicted heat demand and the demand for medium-temperature chilled water A (see Figure 4).

A specific calculation example is shown below. Here, the predicted heat demand is 1000 kW, the air flow rate is 70 kg/s, the specific heat is 1 kJ/(kg·℃), the medium temperature chilled water temperature is 14℃, the air heat exchanger inlet temperature is 25℃, and the air heat exchanger outlet temperature is equal to the medium temperature chilled water temperature.

The demand for medium temperature chilled water A is calculated as follows:
(25-14) * 70 * 1 = 770 kW

And the demand for cold water, C, is calculated as follows:
1000-770=230kW

For example, if the above is for an air conditioner in one location, the total heat value of each air conditioner as described above for the entire building and even the entire block will be the amount of heat that needs to be produced by the district heating and cooling facility. In this embodiment, rather than performing individual calculations for all the air conditioners in the block, demand estimates and heat calculations as described above are performed for representative locations. Here, representative locations can be selected after classifying based on the building use (office, commercial, hotel, etc.), location of the room (direction, floor, perimeter zone, interior zone), characteristics of the room (private area, common area, large space such as hall, etc.), air conditioner type, operating characteristics (24 hours, daytime only), etc. In addition, the number of operating units in the entire city is estimated for each classified air conditioner type, and these are added up to determine the total heat demand for medium temperature chilled water and chilled water for the entire block.

The energy amount calculation unit 60 calculates, for each temperature of medium-temperature chilled water, the amount of input energy corresponding to the demand for medium-temperature chilled water at that temperature and the predicted demand for the chilled water.

Specifically, for each temperature of medium-temperature chilled water, the energy amount calculation unit 60 calculates the amount of energy to be input to the heat source unit 20B for producing medium-temperature chilled water based on the predicted demand for medium-temperature chilled water at that temperature and the efficiency of the heat source unit 20B for producing medium-temperature chilled water at that temperature, calculates the amount of energy to be input to the heat source unit 20A for producing chilled water based on the predicted demand for chilled water and the efficiency of the heat source unit 20A for producing chilled water, and calculates the amount of input energy based on the amount of energy to be input to the heat source unit 20B for producing medium-temperature chilled water and the amount of energy to be input to the heat source unit 20A for producing chilled water.

More specifically, the energy input [kW] to the heat source unit is calculated by the output [kW] of the heat source unit divided by the efficiency (COP) of the heat source unit [-]. The COP is determined from the heat source unit characteristics and the water supply temperature (here, the medium-temperature chilled water temperature and the chilled water temperature). From the above, the amount of energy input to heat source units 20A and 20B is calculated for the predicted demand for medium-temperature chilled water and chilled water (corresponding to the output of the heat source unit).

A specific calculation example is shown below. Here, the COP of the heat source unit 20A for producing cold water is 4.00, the COP of the heat source unit 20B for producing medium-temperature cold water is 4.50, and the demand for medium-temperature cold water and cold water is the value calculated above.

At this time, the sum of the amounts of energy input to the heat source units 20A and 20B is calculated as follows.
230÷4.00+770÷4.50=228.6kW

For simplicity, only the amount of energy input to heat source units 20A and 20B is shown here, but this is not limited to this. Similarly, the amount of energy input to pump power and secondary air conditioners may be calculated from equipment characteristics and conditions and included in the amount of input energy.

The display unit 62 displays, for each temperature of medium-temperature chilled water, the predicted demand for the medium-temperature chilled water at that temperature and the predicted demand for the chilled water. The display unit 62 further displays the calculation results obtained by the energy amount calculation unit 60.

For example, as shown in FIG. 5, for each temperature of medium-temperature chilled water, the ratio of the demand for medium-temperature chilled water at that temperature to the demand for the chilled water is displayed, along with the calculation result of the amount of energy input. FIG. 5 shows an example in which, in pattern 1 where medium-temperature chilled water at 13°C is supplied, the ratio of the demand for medium-temperature chilled water at that temperature to the demand for the chilled water is 20:80, and the amount of energy input is 19.1. Also, in pattern 2 where medium-temperature chilled water at 14°C is supplied, the ratio of the demand for medium-temperature chilled water at that temperature to the demand for the chilled water is 40:60, and the amount of energy input is 18.7. In pattern 3 where medium-temperature chilled water at 15°C is supplied, the ratio of the demand for medium-temperature chilled water at that temperature to the demand for the chilled water is 70:30, and the amount of energy input is 19.0.

The medium-temperature cold water temperature determination unit 64 determines the temperature of the medium-temperature cold water based on the calculation result by the energy amount calculation unit 60. For example, the medium-temperature cold water temperature determination unit 64 determines the temperature of the medium-temperature cold water when the amount of input energy is minimum as the temperature of the medium-temperature cold water. In the example of FIG. 4 above, when the temperature of the medium-temperature cold water is 14°C, the amount of input energy is minimum, so 14°C is determined as the temperature of the medium-temperature cold water.

The operation command output unit 66 outputs an operation command for the predicted target period to the heat source unit 20B for producing medium-temperature chilled water so that medium-temperature chilled water at the determined temperature is produced.

<Operation of air conditioning heat source control system 100>
Next, the operation of the air conditioning heat source control system 100 according to this embodiment will be described.

The server 20 executes the air conditioning heat source control processing routine shown in FIG. 6.

First, in step S100, the weather information acquisition unit 54 acquires weather information for the prediction target period (e.g., the next day) from, for example, a server that provides weather information.

Then, in step S102, the heat demand prediction unit 56 corrects the heat demand of the previous day based on the accumulated actual changes in heat load over time for each heat source unit 20A, 20B and each air conditioner 30A, 30B and the weather information for the prediction target period, as well as the weather information, building information, event information, and unused energy amount in the city for the prediction target period, and predicts the heat demand for the prediction target period.

In step S104, the chilled water demand prediction unit 58 predicts the demand for medium temperature chilled water for each temperature of medium temperature chilled water based on the inlet temperature of the medium temperature chilled water coil, the outlet temperature of the medium temperature chilled water coil determined according to the temperature of the medium temperature chilled water, and the air flow rate of the medium temperature chilled water coil, and predicts the demand for medium temperature chilled water at that temperature as the demand for chilled water, by predicting the difference between the predicted heat demand and the predicted demand for medium temperature chilled water at that temperature, thereby predicting the demand for medium temperature chilled water at that temperature and the demand for chilled water at a temperature lower than the medium temperature chilled water that satisfies the predicted value of heat demand.

In step S106, the energy amount calculation unit 60 calculates the amount of energy to be input to the heat source unit 20B for producing medium-temperature chilled water for each temperature of the medium-temperature chilled water based on the predicted demand for medium-temperature chilled water at that temperature and the previously determined efficiency of the heat source unit 20B for producing medium-temperature chilled water at that temperature, and calculates the amount of energy to be input to the heat source unit 20A for producing chilled water based on the predicted demand for chilled water and the previously determined efficiency of the heat source unit 20A for producing chilled water. The energy amount calculation unit 60 then calculates the sum of the input amounts of energy for each temperature of the medium-temperature chilled water based on the amount of energy to be input to the heat source unit 20B for producing medium-temperature chilled water and the amount of energy to be input to the heat source unit 20A for producing chilled water.

In step S108, the display unit 62 displays the ratio of the demand for medium-temperature chilled water at each temperature to the demand for chilled water, and also displays the calculation results obtained by the energy amount calculation unit 60.

In step S110, the medium-temperature cold water temperature determination unit 64 determines the temperature of the medium-temperature cold water when the amount of input energy is minimum based on the calculation result by the energy amount calculation unit 60 as the temperature of the medium-temperature cold water.

In step S112, the operation command output unit 66 outputs an operation command for the predicted target period to the heat source unit 20B for producing medium-temperature chilled water so that medium-temperature chilled water at the determined temperature is produced.

<Example>
A specific example of the prediction of the demand for medium-temperature chilled water and the demand for chilled water, and the calculation of the input energy amount, which have been described in the above embodiment, will be described.

First, the heat demand of the air conditioner is predicted based on the weather information for the forecast period. Here, the predicted heat demand is assumed to be 1,295 kW. The temperature and specific enthalpy of each state point are as shown in Table 1.

In this case, the air flow rate is calculated by dividing the heat demand by the specific enthalpy difference [kJ/kg] of the air at the inlet and outlet of the cooling coil, so the air flow rate under the above conditions is 70 kg/s.

Next, the demand for medium temperature chilled water and cold water is calculated for each temperature of the medium temperature chilled water. Here, it is assumed that changes in air humidity occur due to heat exchange with the cold water, and the demand for medium temperature chilled water is calculated by multiplying the air flow rate by the difference in air temperature at the inlet and outlet of the heat exchange coil with the medium temperature chilled water. The calculation results for each temperature of medium temperature chilled water are shown in Table 2 below.

As shown in Table 3, the energy input to the heat source unit is calculated for each temperature of the medium-temperature chilled water, and the temperature of the medium-temperature chilled water at which the input energy is minimal is determined as the optimal temperature. In the example of Table 3, the energy input to the heat source unit is minimal when the temperature of the medium-temperature chilled water is 13°C, so the temperature of the medium-temperature chilled water is determined to be 13°C (see Figure 7). At this time, it is assumed that the efficiency of the heat source unit is calculated as shown in Table 4.

As described above, the air conditioning heat source control system according to the embodiment of the present invention can determine the temperature of medium-temperature chilled water by predicting the demand for medium-temperature chilled water at that temperature and the demand for chilled water at a lower temperature than the medium-temperature chilled water that satisfies the heat demand for each temperature of medium-temperature chilled water and searching for the point at which the energy input to the heat source machine is minimized.

The present invention is not limited to the above-described embodiment, and various modifications and applications are possible without departing from the spirit of the invention.

For example, the embodiment is not limited to the above example where the temperature of the medium-temperature chilled water is determined so as to minimize the amount of input energy. The amount of input energy calculated for each temperature of the medium-temperature chilled water may be displayed, and the medium-temperature chilled water temperature may be determined by accepting a selection from the user.
There are also cases where the temperature of both the medium-temperature chilled water and the chilled water can be varied. Even when only chilled water is used as a heat transfer medium for air conditioners, it may be possible to use this system to operate with variable supply temperature based on demand forecasts. It may also be possible to use this system in the same way when supplying hot water during heating.

Reference Signs List 10 Server 20A, 20B Heat source unit 22A, 22B Control device 24 Water heat storage tank 30A, 30B Each air conditioner 32A, 32B Control device 50 Communication unit 52 Calculation unit 54 Weather information acquisition unit 56 Heat demand prediction unit 58 Chilled water demand prediction unit 60 Energy amount calculation unit 62 Display unit 64 Medium temperature chilled water temperature determination unit 66 Operation command output unit 100 Air conditioning heat source control system

Claims (12)

A weather information acquisition unit that acquires weather information for a forecast target period;
A heat demand prediction unit that predicts the heat demand of the air conditioner for the prediction target period based on the weather information;
a chilled water demand prediction unit that predicts, for each temperature of medium-temperature chilled water, a demand for medium-temperature chilled water of that temperature and a demand for chilled water having a temperature lower than that of the medium-temperature chilled water, which satisfy the heat demand;
a medium-temperature chilled water temperature determination unit that determines the temperature of the medium-temperature chilled water produced by the heat source device for producing medium-temperature chilled water so that the amount of energy input to the heat source device is minimized;
Including,
The medium-temperature chilled water and the chilled water are produced by a heat source device, and are used as a heat medium for heat exchange in the air conditioner. A weather information acquisition unit that acquires weather information for a forecast target period;
A heat demand prediction unit that predicts the heat demand of the air conditioner for the prediction target period based on the weather information;
a chilled water demand prediction unit that predicts, for each temperature of medium-temperature chilled water, a demand for medium-temperature chilled water of that temperature and a demand for chilled water having a temperature lower than that of the medium-temperature chilled water, which satisfy the heat demand;
A display unit configured to display the amount of energy input to the heat source machine calculated for each temperature of the medium-temperature chilled water produced by the heat source machine for producing medium-temperature chilled water , in order to receive a selection of the temperature of the medium-temperature chilled water from a user;
Including,
The medium-temperature chilled water and the chilled water are produced by a heat source device, and are used as a heat medium for heat exchange in the air conditioner. The air conditioning heat source control device according to claim 1 or 2, further comprising an energy amount calculation unit that calculates, for each temperature of the medium-temperature chilled water, an input energy amount corresponding to the demand for the medium-temperature chilled water at that temperature and the predicted demand for the chilled water. The cold water demand prediction unit, for each temperature of the medium temperature cold water,
predicting a demand for medium-temperature chilled water at a given temperature based on an inlet temperature of a medium-temperature chilled water coil, an outlet temperature of the medium-temperature chilled water coil determined according to the temperature of the medium-temperature chilled water, and an air flow rate of the medium-temperature chilled water coil;
3 . The air conditioning heat source control device according to claim 1 , further comprising: a controller configured to predict, as the demand for chilled water, a difference between the predicted heat demand and the predicted demand for medium-temperature chilled water of the temperature. The energy amount calculation unit, for each temperature of the medium-temperature cold water,
Calculating the amount of energy to be input to the heat source machine for producing medium-temperature chilled water based on the predicted demand for medium-temperature chilled water at the temperature and the efficiency of the heat source machine for producing medium-temperature chilled water at the temperature that has been calculated in advance;
Calculating an amount of energy to be input to the heat source machine for producing cold water based on the predicted demand for cold water and a previously calculated efficiency of the heat source machine for producing cold water;
The air-conditioning heat source control device according to claim 3 , wherein the input energy amount is calculated based on an amount of energy input to the heat source unit for producing medium-temperature chilled water and an amount of energy input to the heat source unit for producing chilled water. A medium-temperature cold water temperature determination unit that determines a temperature of the medium-temperature cold water based on a result of the calculation by the energy amount calculation unit;
an operation command output unit that outputs an operation command for a prediction target period to a heat source device for producing medium-temperature chilled water so that the medium-temperature chilled water of the determined temperature is produced;
The air conditioning heat source control device according to claim 3 , further comprising: The air conditioning heat source control device according to claim 1 or 2, further comprising a display unit that displays, for each temperature of the medium-temperature chilled water, the demand for the medium-temperature chilled water at that temperature and the predicted demand for the chilled water. The air conditioning heat source control device according to claim 3, further comprising a display unit that displays the calculation results by the energy amount calculation unit. The air conditioner is a plurality of air conditioners,
The air conditioning heat source control device of claim 1 or 2, wherein the heat demand prediction unit predicts the heat demand for the prediction period for a representative air conditioner among the plurality of air conditioners based on the weather information, multiplies the predicted heat demand for the prediction period by the number of the air conditioners, and predicts the total heat demand of the plurality of air conditioners. A weather information acquisition unit acquires weather information for a forecast target period,
A heat demand prediction unit predicts the heat demand of the air conditioner for the prediction target period based on the meteorological information,
a chilled water demand prediction unit predicts, for each temperature of the medium-temperature chilled water, a demand for the medium-temperature chilled water of that temperature and a demand for chilled water having a temperature lower than that of the medium-temperature chilled water that satisfy the heat demand;
a medium-temperature chilled water temperature determination unit determining a temperature of the medium-temperature chilled water produced by a heat source device for producing medium-temperature chilled water so as to minimize an amount of energy input to the heat source device;
The air-conditioning heat source control method, wherein the medium-temperature chilled water and the chilled water are produced by a heat source device and are used as heat transfer media for heat exchange in the air conditioner. A weather information acquisition unit acquires weather information for a forecast target period,
A heat demand prediction unit predicts the heat demand of the air conditioner for the prediction target period based on the meteorological information,
a chilled water demand prediction unit predicts, for each temperature of the medium-temperature chilled water, a demand for the medium-temperature chilled water of that temperature and a demand for chilled water having a temperature lower than that of the medium-temperature chilled water that satisfy the heat demand;
The display unit displays the amount of energy input to the heat source device, calculated for each temperature of the medium-temperature chilled water produced by the heat source device for producing medium-temperature chilled water , in order to accept a selection of the temperature of the medium-temperature chilled water from a user.
Including,
The air-conditioning heat source control method, wherein the medium-temperature chilled water and the chilled water are produced by a heat source device and are used as heat transfer media for heat exchange in the air conditioner. Obtain weather information for the forecast period,
Predicting heat demand for an air conditioner for the prediction target period based on the meteorological information;
predicting, for each temperature of medium-temperature chilled water, a demand for medium-temperature chilled water of that temperature and a demand for chilled water having a temperature lower than that of the medium-temperature chilled water, which satisfy the heat demand;
An air-conditioning heat source control program that causes a computer to execute the following: determining a temperature of medium-temperature chilled water produced by a heat source machine for producing medium-temperature chilled water so that an amount of energy input to the heat source machine is minimized; or displaying an amount of input energy calculated for each temperature of the medium-temperature chilled water and accepting a selection from a user;
An air-conditioning heat source control program in which the medium-temperature chilled water and the chilled water are produced by a heat source device and are used as a heat medium for heat exchange in the air conditioner.