JP2005140367A - Method and device for controlling heat source supply water temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save energy (cost) and provide comfort at the same time. <P>SOLUTION: A supply water temperature determining device (an information collecting device) 5 is provided to collect a supply water temperature tw of heat source water, an indoor temperature tpv, set indoor temperature tsp from hybrid air conditioners (H air conditioners) 1-1 to 1-n, and obtain necessary processed heat quantity Q1 to Qn of the H air conditioners 1-1 to 1-n. Then, from a stored power data table TB, power consumptions W1 to Wn corresponding to the necessary processed heat quantity Q1 to Qn of the H air conditioners 1-1 to 1-n at respective supply water temperatures when the supply water temperature of the heat source water is changed, for example, at 0.5°C intervals are obtained as estimated values. From the estimated values W1 to Wn of the obtained power consumptions at the respective supply water temperatures, an estimated value ΣP of a total amount of used electricity of the H air conditioners 1-1 to 1-n at the respective supply water temperatures, for example, for 30 minutes is obtained. The supply water temperature where the estimated value ΣP of the total amount of used electricity is minimum (the supply water temperature of which operation cost is lowest) is determined as the set supply water temperature TW of the heat source water. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat source water supply temperature control method and apparatus in a system in which each room is provided with a hybrid air conditioner in which a fan coil unit and a heat pump type air conditioner are combined.

  A hybrid air conditioner (hereinafter referred to as an H air conditioner) is an air conditioner that combines a fan coil unit (FCU) and a heat pump type air conditioner, and is also referred to as a hybrid FCU (for example, Patent Document 1 as a similar technique). reference). This H air conditioner is installed in a hotel room.

  FIG. 6 shows a schematic configuration of the H air conditioner. In the figure, reference numeral 1 denotes an H air conditioner, and 2 denotes a hotel room provided with an H air conditioner 1. The H air conditioner 1 receives a supply of heat source water from a heat source (not shown) to generate cold heat and heat, a hot / cold water coil 1A, receives a supply of electric power, compresses the heat medium, and compresses the heat medium from the compressed heat medium and the heat source. A heat pump type air conditioner 1B that generates heat and heat using heat source water, a fan 1C, and a controller 1D with a built-in microcomputer are provided.

  A cold / hot water valve 1E is provided in the supply path of the heat source water to the cold / hot water coil 1A. Moreover, the heat source water to the cold / hot water coil 1A is branched before reaching the cold / hot water valve 1E, and is also given to the heat pump type air conditioner 1B. Further, the H air conditioner 1 is provided with a water supply temperature sensor 1F that detects the temperature of the heat source water being supplied (water supply temperature).

[Operation of H air conditioner]
The hotel guest room 2 is provided with a temperature sensor 3 and a temperature setting device 4. The room temperature tpv of the cabin 2 detected by the temperature sensor 2 and the set room temperature tsp from the temperature setter 4 are given to the controller 1D of the H air conditioner 1. The controller 1D opens the chilled water valve 1E (amount of heat source water supplied to the chilled / hot water coil 1A) so that the room temperature tpv from the temperature sensor 3 and the set room temperature tsp from the temperature setting device 4 coincide. Control the performance of the heat pump air conditioner 1B and the rotational speed of the fan 1C.

  In this H air conditioner 1, the controller 1 </ b> D determines the cooling / heating operation by the following algorithm. The controller 1D compares the room temperature tpv with the set room temperature tsp, and if tpv = tsp, sets the “light wind mode (mode 0)”. In the “light wind mode”, the cold / hot water valve 1E is fully closed, the heat pump air conditioner 1B is turned off, and only the fan 1C is rotated at a low speed.

  If tpv <tsp, the controller 1D determines that heating is necessary. In this case, the controller 1D determines whether the heat source water from the heat source is hot water or cold water based on the water supply temperature tw from the water supply temperature sensor 1F. In this example, the case where tw> 25 ° C. is determined as hot water, and the case where tw <25 ° C. is determined as cold water.

  If it is determined that the heat source water from the heat source is hot water, “normal heating (mode 1)” is set, and the opening degree of the cold / hot water valve 1E is controlled. Thus, the amount of hot water supplied to the cold / hot water coil 1A is adjusted, and the amount of heat generated by the cold / hot water coil 1A is adjusted. In addition, the controller 1D controls the rotational speed of the fan 1C together with the adjustment of the heat quantity. In this “normal heating”, the heat pump air conditioner 1B is turned off.

  If it is determined that the heat source water from the heat source is cold water, “heating during cooling (mode 2)” is set, the cold / hot water valve 1E is fully closed, and the supply of cold water to the cold / hot water coil 1A is shut off, and then the heat pump air conditioner 1B is turned on in the heating mode. As a result, the operation of the heat pump type air conditioner 1B is started, and heat is generated using the heat medium compressed by the compressor and the heat source water from the heat source. In addition, the controller 1D controls the rotational speed of the fan 1C in conjunction with the generation of the heat. In this case, the heat source water from the heat source supplied to the heat pump type air conditioner 1B is used in an evaporator for gasifying the liquefied heat medium.

  In step 703, if tpv> tsp, the controller 1D determines that it is necessary to perform cooling. In this case, the controller 1D determines whether the heat source water from the heat source is hot water or cold water based on the water supply temperature tw from the water supply temperature sensor 1F.

  If it is determined that the heat source water from the heat source is cold water (tw <25 ° C.), “normal cooling (mode 3)” is set, and the opening degree of the cold / hot water valve 1E is controlled. Thereby, the amount of cold water supplied to the cold / hot water coil 1A is adjusted, and the amount of cold heat generated by the cold / hot water coil 1A is adjusted. In addition, the controller 1D controls the rotational speed of the fan 1C in conjunction with the adjustment of the amount of cooling heat. In this “normal cooling”, the heat pump air conditioner 1B is turned off.

  If it is determined that the heat source water from the heat source is hot water, it is set to “cooling during heating (mode 4)”, the cold / hot water valve 1E is fully closed, and the supply of hot water to the cold / hot water coil 1A is shut off, and then the heat pump air conditioner 1B is turned on in the cooling mode. Thus, the operation of the heat pump type air conditioner 1B is started, and cold heat is generated using the heat medium compressed by the compressor and the heat source water from the heat source. Further, the controller 1D controls the rotational speed of the fan 1C together with the generation of the cold heat. In this case, the heat source water from the heat source supplied to the heat pump type air conditioner 1B is used in a condenser for liquefying the gasified heat medium.

  As described above, if the H air conditioner is used, it is possible to perform cooling even in winter using hot water as heat source water, and heating can be performed even in summer using cold water as heat source water. It is possible to satisfy the comfort of the user. In other words, the FCU alone can switch between cooling and heating only on a seasonal basis, but the H air conditioner can switch between cooling and heating at any time of the year. It is possible to immediately respond to the demands of customers in the guest rooms.

Japanese Patent Laid-Open No. 8-100959

  As described above, the H air conditioner is superior to the FCU in that it can perform heating during cooling, cooling during heating, and the like. However, the power consumption of the H air conditioner is large in the heat pump type air conditioner, and the total power consumption is excessive in a system equipped with a conventional similar H air conditioner in each room such as a hotel, resulting in an increase in operation cost.

  The present invention has been made in order to solve such problems. The object of the present invention is to achieve both energy saving (cost saving) and comfort in a system in which an H air conditioner is provided in each room. An object of the present invention is to provide a heat source water supply temperature control method and apparatus that can be used.

  In order to achieve such an object, the present invention provides a system in which an H air conditioner is provided in each room, and the water supply water temperature from each H air conditioner to at least the H air conditioner and the room in the room provided with the H air conditioner. A step (means) for collecting the temperature and the set indoor temperature, and a step for obtaining a necessary processing heat amount of each H air conditioner based on the collected water supply temperature of the heat source water from each H air conditioner, the indoor temperature, and the set indoor temperature ( Means), a step (means) for storing a table showing the relationship between the amount of heat to be processed, the water supply temperature of the heat source water, and the power consumption of the H air conditioner, and each water supply when the water supply temperature of the heat source water is changed in increments of a predetermined temperature. Steps (means) for obtaining power consumption corresponding to the required amount of heat of each hybrid air conditioner at a temperature from the table as a predicted value, and power consumption of each H air conditioner at each obtained water supply temperature A step of obtaining a predicted value of the total power consumption of all H air conditioners at each water supply temperature based on the predicted value, and determining a water supply temperature having the smallest predicted value of the total power consumption as a set water supply temperature of the heat source water (means) ) And a step (means) for controlling the water supply temperature of the heat source water based on the determined set water supply temperature.

  According to the present invention, the water supply temperature (tw), the room temperature (tpv), and the set room temperature (tsp) of the heat source water are collected from the H air conditioner provided in each room, and the collected water supply temperature tw and the room Based on the temperature tpv and the set room temperature tsp, the necessary processing heat amount of each H air conditioner is obtained. That is, if one H air conditioner is provided in each room, a total of n units, the required processing heat amount of each H air conditioner is obtained as Q1 to Qn. And each water supply when the water supply temperature of heat source water is changed by a predetermined temperature step (for example, 0.5 ° C step) from the table showing the relationship between the amount of processing heat, the water supply water supply temperature and the power consumption of the H air conditioner. The power consumption W1 to Wn corresponding to the necessary processing heat amounts Q1 to Qn of each H air conditioner at the time of temperature is obtained as a predicted value, and from the obtained predicted values W1 to Wn of the power consumption of each H air conditioner at each obtained water supply temperature For example, a predicted value ΣP of the total power consumption for 30 minutes of all H air conditioners at each water supply temperature is obtained. And the water supply temperature with the smallest estimated value (SIGMA) P of this calculated | required total electric power consumption is determined as setting water supply temperature of heat source water.

  According to the present invention, each H at each water supply temperature when the water supply temperature of the heat source water is changed in increments of a predetermined temperature from the table showing the relationship between the amount of heat treated, the water supply temperature of the heat source water, and the power consumption of the H air conditioner. The power consumption corresponding to the required amount of heat treatment of the air conditioner is obtained as a predicted value, and the total power consumption of all H air conditioners at each water supply temperature is calculated from the estimated power consumption value of each H air conditioner at each water supply temperature. A predicted value is obtained, and the water supply temperature with the smallest predicted value of the obtained total power consumption is determined as the set water supply temperature of the heat source water. As a result, the water supply temperature at which the operating cost of the entire H air conditioner provided in the system is the lowest is set as the set water supply temperature of the heat source water, and in a system in which the H air conditioner is provided in each room, energy saving (cost saving) and comfort are achieved. It becomes possible to achieve both.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an air conditioning system to which a heat source water temperature control method according to the present invention is applied.
In the figure, 1-1 to 1-n are H air conditioners provided in the guest rooms 2-1 to 2-n of the hotel. The guest rooms 2-1 to 2-n include temperature sensors 3-1 to 3-n for sending the detected indoor temperatures tpv1 to tpvn to the H air conditioners 1-1 to 1-n, and a set indoor temperature tsp1 to the user. Temperature setting devices 4-1 to 4-n for sending tspn to the H air conditioners 1-1 to 1-n are provided. In this example, n = 200, 200 guest rooms 2 and 200 H air conditioners 1 are provided.

  The H air conditioner 1 (1-1 to 1-n) has the same configuration as the conventional H air conditioner shown in FIG. 6, as shown in FIG. That is, the H air conditioner 1 of the present embodiment also includes a cold / hot water coil 1A, a heat pump type air conditioner 1B, a fan 1C, and a controller 1D with a built-in microcomputer. A cold / hot water valve 1E and a water supply temperature sensor 1F are provided in the supply path of the heat source water to the water coil 1A. Further, the heat source water to the cold / hot water coil 1A is branched before reaching the cold / hot water valve 1E, and is supplied to the heat pump type air conditioner 1B.

  In the present embodiment, the difference from the conventional system is that the H air conditioners 1-1 to 1-n are connected to a water supply temperature determining device (information collecting device) 5 via a dedicated communication line L. . Moreover, in the water supply temperature determination apparatus 5, the optimal value of the water supply temperature of the heat source water from the heat source 6 to the H air conditioners 1-1 to 1-n is determined based on the data collected from the H air conditioners 1-1 to 1-n. The optimum value of the determined water supply temperature is sent to the heat source controller 7 as the set water supply temperature TW. The heat source controller 7 receives the set water supply temperature TW from the water supply temperature determination device 5 and controls the heat source 6 so that the temperature of the heat source water from the heat source 6 matches the set water supply temperature TW.

  The water supply temperature determination device 5 is realized by hardware including a processor and a storage device, and a program that realizes various functions as the water supply temperature determination device in cooperation with these hardware, and functions unique to the present embodiment. It has an optimum water supply temperature determination function that determines the optimal value of the water supply temperature of the heat source water. Hereinafter, according to the flowchart shown in FIG. 3, the optimal water supply temperature determination function which the water supply temperature determination apparatus 5 has is demonstrated.

  The water supply temperature determination device 5 sets the control cycle to 30 minutes and repeatedly executes the processing operation according to the flowchart shown in FIG. First, the water supply temperature determination device 5 collects data from the H air conditioners 1-1 to 1-n at regular intervals within 0 to 20 minutes within the control cycle (step 301). In the present embodiment, the water supply temperatures tw1 to twn of the heat source water to the H air conditioners 1-1 to 1-n, the indoor temperatures tpv1 to tpvn sent from the temperature sensors 3-1 to 3-n, and the temperature setting Of the set room temperatures tsp1 to tspn sent from the devices 4-1 to 4-n, the actual rotational speed Npv of the fan 1C, the set rotational speed Nsp to the fan 1C, and the H air conditioners 1-1 to 1-n Collects the operation status and abnormal information such as failure as data.

  Next, the water supply temperature determination device 5 executes the processing operations of Steps 302 to 309 during 20 to 26 minutes within the control cycle. First, in step 302, based on the data collected from the H air conditioners 1-1 to 1-n, the average values tpva1 to tpvan of the room temperatures tpv1 to tpvn of the guest rooms 2-1 to 2-n and the guest rooms 2-1 to 2 are used. The average values tspa1 to tspan of the set room temperatures tsp1 to tspn of -n and the average values twa1 to twan of the water supply temperatures tw1 to twn of the heat source water to the H air conditioners 1-1 to 1-n are calculated.

  Next, the calculated average values tpva1 to tpvan of the room temperatures of the guest rooms 2-1 to 2-n, the average values tspa1 to tspan of the set room temperatures of the guest rooms 2-1 to 2-n, and the H air conditioner 1-1. From the average values twa1 to twan of the feed temperature of the heat source water to ˜1-n, the required amount of heat for H air conditioners 1-1 to 1-n is determined as follows (step 303).

[In case of cooling heating]
If the water supply temperature tw of the heat source water is tw <25 ° C. and the average value tpva of the indoor temperature is tpva <tspa with respect to the average value tspa of the set indoor temperature, it is determined that the cooling is in heating, and the average of the indoor temperature The necessary processing heat quantity Q required for heating the H air conditioner 1 is obtained from the difference between the value tpva and the average value tspa of the set room temperature and the volume of the cabin 2. In the present embodiment, the processing heat amount Q required for this heating is represented by minus (−).

[In case of heating and cooling]
If the water supply temperature tw of the heat source water is tw> 25 ° C. and the average value tpva of the indoor temperature is tpva> tspa with respect to the average value tspa of the set indoor temperature, it is determined that the cooling is during heating, and the average of the indoor temperature The necessary processing heat quantity Q required for cooling the H air conditioner 1 is obtained from the difference between the value tpva and the average value tspa of the set room temperature and the volume of the cabin 2. In the present embodiment, the processing heat amount Q required for this cooling is represented by plus (+).

  Next, the water supply temperature determination device 5 supplies water from the heat source water based on a table (hereinafter, this table is referred to as an electric power data table) showing the relationship between a predetermined amount of heat for treatment, the water supply temperature, and the power consumption of the H air conditioner. Predict the power consumption W1 to Wn corresponding to the required heat amounts Q1 to Qn of the H air conditioners 1-1 to 1-n at each water supply temperature when the temperature is changed from 7 ° C to 45 ° C in 0.5 ° C increments Calculate as a value.

  FIG. 4 shows an example of the power data table described above. In this example, only “7 ° C.”, “10 ° C.”, “20 ° C.”, “25 ° C.”, “35 ° C.”, and “45 ° C.” are shown as the water supply temperatures. The water supply temperature is calculated in increments of 0.5 ° C. Further, in the processing heat amount, minus (−) represents the processing heat amount required for heating, and plus (+) represents the processing heat amount required for cooling. In this power data table TB, the value specified at the intersection of the processing heat quantity vertically arranged and the water supply temperature horizontally arranged indicates the power consumption (W) of the H air conditioner 1 required at that time.

[Reason why power consumption of H air conditioner varies depending on water supply temperature]
In the H air conditioner 1, power is mainly consumed in the heat pump type air conditioner 1B and the fan 1C. The heat pump air conditioner 1 </ b> B compresses the heat medium when supplied with electric power, and generates cold and hot heat using the compressed heat medium and the heat source water from the heat source 6. When performing cooling, heat source water is used in a condenser for liquefying the gasified heat medium, and when heating is performed, heat source water is used in an evaporator for gasifying the liquefied heat medium. Is used.

  When heat source water is used in a condenser for liquefying the gasified heat medium, the lower the temperature of the heat source water, the smaller the power consumption in the H air conditioner 1. When heat source water is used in an evaporator for gasifying a liquefied heat medium, the power consumption of the H air conditioner 1 decreases as the temperature of the heat source water increases. Therefore, the power consumption of the H air conditioner 1 when using the heat pump type air conditioner 1B varies not only with the amount of heat processed by the H air conditioner 1, but also with the water supply temperature of the heat source water. In the present embodiment, the relationship between the amount of heat treated by the H air conditioner 1, the water supply temperature of the heat source water, and the power consumption is obtained as an experimental value in advance, and is stored in the water supply temperature determination device 5 as a power data table TB so as to be rewritable. Yes.

  In the above-described step 304, the water supply temperature determining device 5 is configured to change the water supply temperature of the heat source water from 7 ° C. to 45 ° C. in increments of 0.5 ° C. H air conditioners 1-1 to 1-n at each water supply temperature. After calculating the power consumption W1 to Wn corresponding to the necessary processing heat amounts Q1 to Qn as predicted values from the power data table TB, prediction of the power consumption of the H air conditioners 1-1 to 1-n at each calculated water supply temperature From the values W1 to Wn, predicted values P1 to Pn of power consumption for 30 minutes of the H air conditioners 1-1 to 1-n at each water supply temperature are obtained (step 305).

  Then, based on the predicted values P1 to Pn of the power consumption of the H air conditioners 1-1 to 1-n at the respective water supply temperatures, the total power consumption of the H air conditioners 1-1 to 1-n at the respective water supply temperatures. Is calculated (step 306), and the calculated predicted value ΣP of the total power consumption is converted into a cost (total cost) (step 307).

  Then, the water supply temperature having the lowest cost among the total costs is determined as an optimum value (step 308), and the determined optimum value of the water supply temperature is sent to the heat source controller 7 as the set water supply temperature TW (step 309). This is none other than determining the water supply temperature with the smallest predicted value ΣP of the total power consumption as the optimum value, and sending the determined optimum value of the water supply temperature to the heat source controller 7 as the set water supply temperature TW.

  The heat source controller 7 controls the temperature of the heat source water from the heat source 6 to the H air conditioners 1-1 to 1-n so as to match the set water supply temperature TW sent from the water supply temperature determining device 5. After sending the set water supply temperature TW to the heat source controller 7, the water supply temperature determining device 5 stands by as an effect waiting time for the remaining 26 to 30 minutes of the control cycle, and returns to step 301 to repeat the above-described operation.

  FIG. 5 shows an example of the predicted power consumption P at each water supply temperature, the total power consumption ΣP, and the total cost. In this example, only “7 ° C.”, “10 ° C.”, “20 ° C.”, “25 ° C.”, “35 ° C.”, and “45 ° C.” are shown as the water supply temperatures. Water supply temperature exists in increments of 0.5 ° C. Further, only six predicted values P1 to P6 are shown as predicted values P of the power consumption amount of the H air conditioner 1, that is, predicted values P1 to P1 of the power consumption amounts of the H air conditioners 1-1 to 1-6 (not shown). Although only P6 is shown, 200 H air conditioners 1 are actually provided, and a predicted value P of the power consumption at each water supply temperature exists corresponding to the 200 H air conditioners 1.

  In the example of FIG. 5, when the water supply temperature is 7 ° C., the value obtained by adding the predicted values P1 to P6 of the power consumption amounts of the H air conditioners 1-1 to 1-6 becomes the total power consumption ΣP (= 22 kWh). “¥ 1,133” obtained by converting the total power consumption into cost is obtained as the total cost. Similarly, “¥ 877” is the total cost when the water supply temperature is 10 ° C., “¥ 853” is the total cost when the water supply temperature is 20 ° C., and “¥ 742” is the total cost when the water supply temperature is 25 ° C. , “¥ 1,099” is obtained as the total cost at 35 ° C., and “¥ 3,268” is obtained as the total cost at 45 ° C. In this example, 25 ° C., which is the water supply temperature with the lowest total cost, is determined as the optimum value, and this is sent as the set water supply temperature TW from the water supply temperature determination device 5 to the heat source controller 7.

  In the above-described embodiment, it is needless to say that the power consumption data in the power data table TB (FIG. 4) in the water supply temperature determination device 5 is not a fixed value and can be rewritten as necessary. .

It is a figure showing one embodiment of an air-conditioning system to which a heat source water temperature control method concerning the present invention was applied. It is a figure which shows the outline of the internal structure of the H air conditioner used for this air conditioning system. It is a flowchart for demonstrating the optimal water supply temperature determination function which the water supply temperature determination apparatus in this air-conditioning system has. It is a figure which shows an example of the electric power data table memorize | stored in the water supply temperature determination apparatus in this air conditioning system. It is a figure which shows an example of the predicted value P of electric power consumption at the time of each water supply temperature calculated | required with the water supply temperature determination apparatus in this air conditioning system, total electric power consumption (SIGMA) P, and total cost. It is a figure which shows schematic structure of the conventional H air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (1-1-1-n) ... Hybrid air conditioner (H air conditioner), 1A ... Cold / hot water coil, 1B ... Heat pump type air conditioner, 1C ... Fan, 1D ... Controller, 1E ... Cold / hot water valve, 1F ... Water supply temperature sensor, 2 (2-1 to 2-n) ... guest room, 3 (3-1 to 3-n) ... temperature sensor, 4 (4-1 to 4-n) ... temperature setter, 5 ... water supply temperature determination device (information Collecting device), 6 ... heat source, 7 ... heat source controller, L ... dedicated communication line.

Claims (2)

A heat pump type air conditioner that generates cold and warm heat by using a cold / hot water coil that generates cold and hot heat by receiving heat source water and compresses the heat medium that receives power and compresses the heat medium and the heat source water In a system where each room has a hybrid air conditioner equipped with
Collecting the temperature of water supplied from at least each of the hybrid air conditioners to the hybrid air conditioner, the indoor temperature of the room in which the hybrid air conditioner is provided, and the set indoor temperature;
Obtaining a required amount of heat for each hybrid air conditioner based on the collected water temperature, indoor temperature, and set indoor temperature of the heat source water from each collected hybrid air conditioner;
Storing a table indicating the relationship between the amount of heat processed, the water supply temperature of the heat source water, and the power consumption of the hybrid air conditioner;
A step of obtaining power consumption corresponding to a required processing heat amount of each hybrid air conditioner at each water supply temperature when changing the water supply temperature of the heat source water in a predetermined temperature unit as a predicted value from the table;
Based on the predicted value of power consumption of each hybrid air conditioner at each calculated water supply temperature, a predicted value of the total power consumption of all hybrid air conditioners at each water supply temperature is obtained. Determining a low water supply temperature as a set water supply temperature of the heat source water;
And a step of controlling the water supply temperature of the heat source water based on the determined set water supply temperature. A heat pump type air conditioner that generates cold and warm heat by using a cold / hot water coil that generates cold and hot heat by receiving heat source water and compresses the heat medium that receives power and compresses the heat medium and the heat source water A hybrid air conditioner provided in each room, and
Means for collecting a water supply temperature of at least the heat source water from each hybrid air conditioner to the hybrid air conditioner, a room temperature of the room in which the hybrid air conditioner is provided, and a set room temperature;
Means for obtaining a necessary amount of heat for each of the hybrid air conditioners based on a water supply temperature, a room temperature, and a set room temperature of the heat source water from each of the collected hybrid air conditioners;
Means for storing a table indicating the relationship between the amount of heat to be processed, the water supply water temperature, and the power consumption of the hybrid air conditioner;
Means for obtaining from the table as a predicted value the power consumption corresponding to the required processing heat amount of each hybrid air conditioner at each water supply temperature when the water supply temperature of the heat source water is changed in predetermined temperature increments;
Based on the predicted value of power consumption of each hybrid air conditioner at each calculated water supply temperature, a predicted value of the total power consumption of all hybrid air conditioners at each water supply temperature is obtained. Means for determining a low water supply temperature as a set water supply temperature of the heat source water;
And a means for controlling the water supply temperature of the heat source water based on the determined set water supply temperature.

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