JP2024005976A - Air conditioning heat source control device, air conditioning heat source control method, and air conditioning heat source control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine a temperature of medium-temperature cold water produced by a heat source machine so that the heat source machine operates optimally.

SOLUTION: An air conditioning heat source control device comprises: a weather information acquisition unit that acquires weather information for a prediction target period; a heat demand prediction unit that predicts heat demand of an air conditioner during the prediction target period based on the weather information; a cold water demand prediction unit that predicts, for each temperature of medium-temperature cold water, demand for medium-temperature cold water at the temperature and demand for cold water having a lower temperature than the medium-temperature cold water, which satisfy the heat demand; and a display unit that displays, for each temperature of the medium-temperature cold water, prediction results of the demand for medium-temperature cold water at the temperature and the demand for the cold water.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

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.

BACKGROUND ART Conventionally, air conditioning control systems have been known that control the opening degree of a cold water valve provided in a cold water supply passage to a cold water coil and the opening degree 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 calculates 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, and controls the valve. determine the opening command value of the valve, calculate the 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 Compare the opening command value based on the temperature measurement value and the opening command value based on the return water temperature measurement value, and choose the one with the smaller opening value out of the two opening command values as the actual opening command value. selected as. This air conditioning control system suppresses excessive flow of cold water to the cold/hot water coil and the cold water coil.

The air conditioning system also includes a supply air passage through which supply air flows, a heat source section that generates cold water, and a heat exchange section that can cool the supply air flowing through the supply air passage by heat exchange with the cold water. An air conditioning system that realizes appropriate air conditioning according to load fluctuations is known (Patent Document 2). This air conditioning system uses low-temperature and medium-temperature cold water to save energy.

Japanese Patent Application Publication No. 2013-204889 Japanese Patent Application Publication No. 2019-124396

In addition, in central air conditioning, where multiple air conditioners are centrally controlled in a central control room, it is common for only cold water to be supplied as a heat medium to the air conditioners during cooling, but in recent years, energy saving has been improved. For this reason, there is also a known technology that utilizes two heat media: cold water and medium-temperature cold water. Here, if the cold water temperature is fixed and the medium-temperature cold water temperature is variable, the temperature selection of the medium-temperature cold water may not be optimal from the viewpoint of energy saving. That is, if the temperature of medium-temperature cold water is too high, a situation may occur in which the amount of medium-temperature cold water used is small, and there is a possibility that a sufficient energy saving effect cannot be ensured. Furthermore, if the temperature of the medium-temperature cold water is too low, energy saving performance may deteriorate.

The present invention has been made in view of the above circumstances, and provides an air conditioning heat source control device, an air conditioning heat source control method, and an air conditioning heat source control method capable of determining the temperature of medium-temperature cold water produced by a heat source device so as to achieve optimal operation of the heat source device. The purpose is to provide an air conditioning heat source control program.

In order to achieve the above object, an air conditioning heat source control device according to a first aspect of the present invention includes a weather information acquisition unit that acquires weather information for a prediction target period, and a weather information acquisition unit that acquires weather information for a prediction target period, and a heat demand prediction unit that predicts heat demand; and a cold water demand prediction unit that predicts, for each temperature of medium-temperature cold water, the demand for medium-temperature cold water at the temperature that satisfies the heat demand and the demand for cold water whose temperature is lower than the medium-temperature cold water. It is composed of .

According to the air conditioning heat source control device according to the first aspect of the invention, the weather information acquisition unit acquires weather information for the prediction target period. The heat demand prediction unit predicts the heat demand of the air conditioner during the prediction period based on the weather information. The cold water demand prediction unit predicts, for each temperature of medium-temperature cold water, the demand for medium-temperature cold water at that temperature and the demand for cold water whose temperature is lower than the medium-temperature cold water, which satisfies the heat demand.

In this way, for each temperature of medium-temperature cold water, by predicting the demand for medium-temperature cold water at the relevant temperature that satisfies the heat demand and the demand for cold water whose temperature is lower than the medium-temperature cold water, the heat source equipment can be operated optimally. It is possible to determine the temperature of medium-temperature cold water produced by the heat source machine.

Further, in the air conditioning heat source control method according to the second invention, the weather information acquisition section acquires weather information of the prediction target period, and the heat demand prediction section determines whether the air conditioner is activated during the prediction target period based on the weather information. For each temperature of medium-temperature cold water, the cold water demand prediction unit predicts, for each temperature of medium-temperature cold water, the demand for medium-temperature cold water at the temperature that satisfies the heat demand, and the demand for cold water whose temperature is lower than the medium-temperature cold water.

Further, the air conditioning heat source control program according to the third invention acquires weather information for a prediction target period, predicts the heat demand of an air conditioner for the prediction target period based on the weather information, and calculates the heat source control program for each temperature of medium-temperature cold water. The program is a program that causes a computer to predict the demand for medium-temperature cold water at the relevant temperature and the demand for cold water whose temperature is lower than the medium-temperature cold water to satisfy the heat demand.

As explained above, according to the air conditioning heat source control device, the air conditioning heat source control method, and the air conditioning heat source control program of the present invention, for each temperature of the medium temperature cold water, the demand for medium temperature cold water at the temperature that satisfies the heat demand and the above By predicting the demand for cold water whose temperature is lower than that of medium-temperature cold water, an effect can be obtained in that the temperature of medium-temperature cold water produced by the heat source device can be determined so as to achieve optimal operation of the heat source device.

1 is a block diagram showing an air conditioning heat source control system according to an embodiment of the present invention. FIG. 3 is a diagram for explaining a method of supplying cold water and medium-temperature cold water from a heat source device to an air conditioner. FIG. 1 is a block diagram showing the configuration of a server according to an embodiment of the present invention. It is a figure which shows an example of an psychrometric diagram. It is a figure showing an example of a display. It is a flowchart which shows the content of the air-conditioning heat source control processing routine in the server based on embodiment of this invention. It is a graph showing the relationship between medium-temperature cold water temperature and total input energy.

Embodiments of the present invention will be described below 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 devices 20A and 20B, and a heat source device provided for each of the heat source devices 20A and 20B. It includes control devices 22A and 22B, a plurality of air conditioners 30A and 30B, and control devices 32A and 32B provided for each of the air conditioners 30A and 30B.

The air conditioning heat source control system 100 is provided within the same city block, for example. The control devices 22A, 22B and the server 10 are interconnected via a network N such as a LAN or the Internet. Note that the server 10 is an example of an air conditioning heat source control device. Further, the number of heat source devices may be three or more, and the number of air conditioners may be one or three or more.

The heat source device 20A is a heat source device that produces cold water, and is, for example, a refrigerator (such as a turbo refrigerator) that produces cold water.

The heat source device 20B is a heat source device that produces medium-temperature cold water, and is, for example, a refrigerator (such as a turbo refrigerator) that produces medium-temperature cold water.

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

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

Further, as auxiliary equipment, a cooling tower, a cold water pump, a cooling water pump, a heat exchanger, and a cold water supply pump that conveys a heat medium to the building side may be provided.

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

Each of the control devices 22A and 22B controls the operation of the connected heat source devices 20A and 20B.

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 cold water and cold water at a predetermined temperature, and determines an operation plan for each heat source device 20A, 20B and each air conditioner 30A, 30B so that the cold water is used after the medium-temperature cold water is used up. A driving command according to the driving plan is transmitted to each control device 22A, 22B, 32A, 32B.

Specifically, as shown in FIG. 3, the server 10 includes a communication section 50 and a calculation section 52. The calculation unit 52 includes a weather information acquisition unit 54, a heat demand prediction unit 56, a cold water demand prediction unit 58, an energy amount calculation unit 60, a display unit 62, a medium temperature cold 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 of each heat source device 20A, 20B and each air conditioner 30A, 30B, device specifications, device characteristics, and event information. The communication unit 50 transmits the operation command to the control devices 22A, 22B of each heat source device 20A, 20B, and the control device 32A, 32B of each air conditioner 30A, 30B.

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

The heat demand prediction unit 56 predicts the heat demand of the air conditioner during the prediction period based on the weather information of the prediction period. Specifically, based on the accumulated track record of changes in heat demand for each heat source device 20A, 20B and each air conditioner 30A, 30B over time, and weather information for the forecast period (for example, the next day), the prediction target period is determined. Forecast heat demand. The span to be predicted is a short span, for example, in units of time. More specifically, the previous day's heat demand is corrected based on weather information, building information, event information, and the amount of unused energy in the city for the prediction period, and is used as a predicted value.

The cold water demand prediction unit 58 predicts, for each temperature of the medium-temperature cold water, the demand for medium-temperature cold water at the temperature that satisfies the predicted value of heat demand, and the demand for cold water whose temperature is lower than the medium-temperature cold water.

Specifically, the cold water demand prediction unit 58 calculates, for each temperature of the medium-temperature cold water, the inlet temperature of the medium-temperature cold water coil, the outlet temperature of the medium-temperature cold water coil determined according to the temperature of the medium-temperature cold water, and the air flow rate of the medium-temperature cold water coil. Based on this, the demand for medium-temperature cold water at the temperature is predicted, and the difference between the predicted heat demand and the predicted demand for medium-temperature cold water at the temperature is predicted as the demand for cold water.

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

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

The air temperature at the heat exchanger outlet is calculated based on the air conditioner characteristics and the medium-temperature cold water temperature B. From the above, the demand A for medium-temperature cold water is determined from the specific heat of the air, the flow rate, the air temperature at the inlet of the heat exchanger, and the medium-temperature cold water temperature B.

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

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

Demand A for medium-temperature cold water is calculated as follows.
(25-14)*70*1=770kW

In addition, the demand for cold water C is calculated as follows.
1000-770=230kW

For example, in the case of an air conditioner at one location as described above, the total amount of heat of each air conditioner as described above becomes the amount of heat that needs to be produced by the district heating and cooling facility for the entire building and even for the entire city block. In this embodiment, instead of performing individual calculations for all air conditioners in a city block, demand estimation and heat calculations as described above are performed at representative locations. Here, the purpose of the building (office, commercial, hotel, etc.), location of the room (direction, floor, perimeter zone, interior zone), characteristics of the room (exclusive area, common area, large space such as hall, etc.), air conditioner After classifying based on type, operating characteristics (24 hours, daytime only), etc., representative locations can be selected. Also, for each classified air conditioner type, the number of units in operation in the entire city is estimated and summed to determine the total heat demand for medium-temperature cold water and chilled water for the entire city block.

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

Specifically, for each temperature of the medium-temperature cold water, the energy amount calculation unit 60 calculates, for each temperature of the medium-temperature cold water, the predicted demand for medium-temperature cold water at the temperature, and the efficiency of the heat source machine 20B for producing medium-temperature cold water at the temperature determined in advance. Based on the above, calculate the amount of energy to be input into the heat source machine 20B for producing medium-temperature cold water, and calculate the amount of energy input to the heat source machine 20B for producing cold water based on the predicted demand for cold water and the efficiency of the heat source machine 20A for producing cold water determined in advance. Calculate the amount of energy input into the heat source machine 20A for medium temperature cold water production, and calculate the input energy amount based on the amount of energy input into the heat source machine 20B for medium temperature cold water production and the amount of energy input into the heat source machine 20A for cold water production. do.

More specifically, the input energy [kW] to the heat source device is determined by the output [kW] of the heat source device divided by the efficiency (COP) of the heat source device [-]. Moreover, COP is determined from the heat source equipment characteristics and the water supply temperature (here, medium-temperature cold water temperature and cold water temperature). As described above, the amount of energy input to the heat source devices 20A and 20B is calculated for the predicted demands for medium-temperature cold water and cold water (corresponding to the output of the heat source devices).

A specific calculation example is shown below. Here, it is assumed that the COP of the heat source device 20A for producing cold water is 4.00, the COP of the heat source device 20B for producing medium temperature cold water is 4.50, and the demands for medium temperature cold water and cold water are the values calculated above.

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

Although only the amount of energy input to the heat source devices 20A and 20B is shown here for the sake of simplicity, it is not limited to this. Similarly, the pump power and the amount of energy input to the secondary air conditioner may be calculated from equipment characteristics, conditions, etc. and included in the amount of input energy.

The display unit 62 displays, for each temperature of medium-temperature cold water, the demand for medium-temperature cold water at that temperature and the prediction result of the demand for cold water. The display section 62 further displays the calculation result by the energy amount calculation section 60.

For example, as shown in FIG. 5, for each temperature of medium-temperature cold water, the ratio between the demand for medium-temperature cold water at the temperature and the demand for the cold water is displayed, and the calculation result of the amount of input energy is displayed. FIG. 5 shows an example in which, in pattern 1 for supplying medium-temperature cold water at 13° C., the ratio between the demand for medium-temperature cold water at the temperature and the demand for the cold water is 20:80, and the input energy amount is 19.1. There is. Further, in pattern 2 for supplying medium-temperature cold water of 14° C., an example is shown in which the ratio of the demand for medium-temperature cold water at the temperature and the demand for the cold water is 40:60, and the input energy amount is 18.7. In pattern 3 for supplying medium-temperature cold water at 15° C., an example is shown in which the ratio of the demand for medium-temperature cold water at the temperature and the demand for the cold water is 70:30, and the input energy amount 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 input energy amount is the 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 input energy amount is the 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 prediction target period to the heat source device 20B for producing medium-temperature cold water so that medium-temperature cold water at the determined temperature is manufactured.

<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 explained.

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

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

Then, in step S102, the heat demand forecasting unit 56 calculates the amount of heat the previous day based on the accumulated track record of the temporal change in the heat load of each heat source device 20A, 20B and each air conditioner 30A, 30B, and the weather information of the prediction target period. The heat demand for the forecast period is corrected based on weather information, building information, event information, and the amount of unused energy in the city for the forecast period, and the heat demand for the forecast period is predicted.

In step S104, the cold water demand prediction unit 58 calculates, for each temperature of medium-temperature cold water, the inlet temperature of the medium-temperature cold water coil, the outlet temperature of the medium-temperature cold water coil determined according to the temperature of the medium-temperature cold water, and the air flow rate of the medium-temperature cold water coil. The heat demand is predicted by predicting the demand for medium-temperature cold water at the relevant temperature based on The demand for medium-temperature cold water at the relevant temperature and the demand for cold water whose temperature is lower than the medium-temperature cold water, which satisfy the value, are predicted.

In step S106, the energy amount calculation unit 60 calculates, for each temperature of medium-temperature cold water, the predicted demand for medium-temperature cold water at the temperature and the efficiency of the heat source device 20B for producing medium-temperature cold water at the temperature determined in advance. Based on the predicted demand for cold water and the efficiency of the heat source machine 20A for cold water production determined in advance, the amount of energy to be input into the heat source machine 20B for producing medium-temperature cold water is calculated. Calculate the amount of energy to be input into the heat source device 20A. Then, the energy amount calculation unit 60 calculates the input energy based on the amount of energy input to the heat source device 20B for producing medium temperature cold water and the amount of energy input to the heat source device 20A for producing cold water for each temperature of the medium temperature cold water. Calculate the sum of quantities.

In step S108, the display unit 62 displays, for each temperature of the medium-temperature cold water, the ratio between the demand for medium-temperature cold water and the demand for cold water at the temperature, and also displays the calculation result by the energy amount calculation unit 60.

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

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

<Example>
A specific example of predicting the demand for medium-temperature cold water and cold water, and calculating the input energy amount, which were explained in the above embodiment, will be explained.

First, the heat demand for air conditioners is predicted based on weather information for the prediction period. Here, it is assumed that the predicted heat demand is 1295 kW. Furthermore, the temperature and specific enthalpy at each state point are as shown in Table 1.

At this time, the air flow rate is determined by dividing the heat demand by the specific enthalpy difference [kJ/kg] between 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 demands for medium-temperature cold water and cold water are calculated for each temperature of medium-temperature cold water. Here, it is assumed that the humidity change in the air occurs due to heat exchange with cold water, and the demand for medium-temperature cold water is calculated by multiplying the air flow rate by the air temperature difference at the entrance and exit of the heat exchange coil with medium-temperature cold water. The calculation results for each temperature of medium-temperature cold water are shown in Table 2 below.

As shown in Table 3, the energy input to the heat source device is calculated for each temperature of the medium-temperature cold water, and the temperature of the medium-temperature cold water at which the input energy becomes the minimum is determined as the optimum temperature. In the example of Table 3, the energy input to the heat source device is minimum when the temperature of the medium-temperature cold water is 13°C, so the temperature of the medium-temperature cold water is determined to be 13°C (see FIG. 7). At this time, it is assumed that the heat source equipment efficiency is calculated as shown in Table 4.

As explained above, according to the air conditioning heat source control system according to the embodiment of the present invention, for each temperature of medium-temperature cold water, the demand for medium-temperature cold water at the corresponding temperature and the cold water having a lower temperature than the medium-temperature cold water satisfy the heat demand. The temperature of medium-temperature cold water can be determined by predicting the demand for water and searching for the point where the energy input to the heat source equipment is minimal.

Note that the present invention is not limited to the embodiments described above, and various modifications and applications are possible without departing from the gist of the present invention.

For example, a case has been described in which the temperature of medium-temperature cold water is determined so as to minimize the input energy amount, but the present invention is not limited to this. The input energy amount calculated for each temperature of the medium-temperature cold water may be displayed, a selection from the user may be accepted, and the temperature of the medium-temperature cold water may be determined.
Furthermore, the temperatures of both medium-temperature cold water and cold water may be made variable. Furthermore, even when only chilled water is used as a heating medium in an air conditioner, it may be possible to operate the system by varying the supply temperature based on demand forecasts. It may also be used in the same way to supply hot water during heating.

10 Servers 20A, 20B Heat source devices 22A, 22B Control device 24 Water heat storage tanks 30A, 30B Each air conditioner 32A, 32B Control device 50 Communication section 52 Computation section 54 Weather information acquisition section 56 Heat demand prediction section 58 Cold water demand prediction section 60 Energy Quantity calculation unit 62 Display unit 64 Medium temperature cold water temperature determination unit 66 Operation command output unit 100 Air conditioning heat source control system

Claims (10)

a weather information acquisition unit that acquires weather information for the prediction target period;
a heat demand prediction unit that predicts the heat demand of the air conditioner during the prediction target period based on the weather information;
a cold water demand prediction unit that predicts, for each temperature of medium-temperature cold water, demand for medium-temperature cold water at the temperature and demand for cold water having a lower temperature than the medium-temperature cold water to satisfy the heat demand;
Air conditioning heat source control equipment including. The air conditioning heat source control device according to claim 1, further comprising an energy amount calculation unit that calculates, for each temperature of the medium-temperature cold water, an input energy amount corresponding to a demand for medium-temperature cold water at the temperature and a prediction result of the demand for the cold water. The cold water demand forecasting unit calculates, for each temperature of the medium-temperature cold water,
Based on the inlet temperature of the medium-temperature cold water coil, the outlet temperature of the medium-temperature cold water coil determined according to the temperature of the medium-temperature cold water coil, and the air flow rate of the medium-temperature cold water coil, predicting the demand for medium-temperature cold water at the temperature,
The air conditioning heat source control device according to claim 1, wherein a difference between the predicted heat demand and the predicted demand for medium-temperature cold water at the temperature is predicted as the demand for cold water. The energy amount calculation unit includes, for each temperature of the medium-temperature cold water,
Calculate the amount of energy to be input into the heat source machine for producing medium-temperature cold water based on the predicted demand for medium-temperature cold water at the temperature and the efficiency of the heat source machine for producing medium-temperature cold water at the temperature determined in advance. death,
Calculating the amount of energy to be input into the heat source machine for producing cold water based on the predicted demand for cold water and the efficiency of the heat source machine for producing cold water determined in advance,
The air conditioning heat source control device according to claim 2, wherein the input energy amount is calculated based on the amount of energy input to the heat source device for producing medium-temperature cold water and the amount of energy input to the heat source device for producing cold water. a medium-temperature cold water temperature determination unit that determines the temperature of the medium-temperature cold water based on the calculation result 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 machine for producing medium-temperature cold water so that medium-temperature cold water of a determined temperature is produced;
The air conditioning heat source control device according to claim 2, further comprising: The air conditioning heat source control device according to claim 1, further comprising a display unit that displays, for each temperature of the medium-temperature cold water, a demand for medium-temperature cold water at the temperature and a prediction result of the demand for the cold water. The air conditioning heat source control device according to claim 2, further comprising a display section that displays the calculation result by the energy amount calculation section. The air conditioner is a plurality of air conditioners,
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, and calculates the predicted heat demand for the prediction period. The air conditioning heat source control device according to claim 1, wherein the demand is multiplied by the number of the air conditioners to predict the total heat demand of the plurality of air conditioners. The weather information acquisition unit acquires weather information for the forecast period,
a heat demand forecasting unit predicts the heat demand of the air conditioner during the forecast period based on the weather information;
An air conditioning heat source control method, wherein, for each temperature of medium-temperature cold water, a cold water demand prediction unit predicts, for each temperature of medium-temperature cold water, a demand for medium-temperature cold water at the temperature and a demand for cold water whose temperature is lower than the medium-temperature cold water, which satisfies the heat demand. Obtain weather information for the forecast period,
predicting the heat demand of an air conditioner during the prediction target period based on the weather information;
An air-conditioning heat source control program that causes a computer to predict, for each temperature of medium-temperature cold water, a demand for medium-temperature cold water at that temperature and a demand for cold water whose temperature is lower than the medium-temperature cold water to satisfy the heat demand.