JP7499577B2 - Air conditioning system control device, air conditioning system, air conditioning system control method and program - Google Patents

Description

This disclosure relates to an air conditioning system control device, an air conditioning system, and an air conditioning system control method and program.

Conventionally, the heat source side has controlled the supply of hot and cold water at a temperature that matches the set water supply temperature while satisfying the load amount required by the load side. In order to do this, the heat source side has controlled the total power consumption of the heat source side equipment (heat source equipment, auxiliary equipment (chilled water pump, cooling water pump, cooling tower)) to be minimized in accordance with the characteristics of the heat source equipment, which change according to the outside air temperature and humidity.

Patent document 1 discloses an air conditioning system that changes the water supply temperature setting based on the outside air temperature and humidity.

Patent No. 6425750

The load side performs local control according to the load required in each area, and the control is carried out according to the load situation. For this reason, for example, when the power of auxiliary equipment is dominant among the load side and heat source side equipment, even if it is better to operate the heat source equipment with a lower COP, such control cannot be performed.
In other words, the heat source side and the load side are not integrated to achieve an optimum control as a whole.

The objective of the present disclosure is to provide an air conditioning system control device, an air conditioning system, an air conditioning system control method, and a program that can realize optimal operation of a heat source unit taking into account the power consumption generated on the load side.

According to one aspect of the present disclosure, an air conditioning system control device includes a setting unit that sets the water supply temperature of a heat source unit, a first calculation unit that calculates the amount of air supplied to the room in a load side device according to the water supply temperature, a second calculation unit that calculates the water supply flow rate of the heat source unit according to the water supply temperature, and an estimation unit that estimates the total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate. The setting unit sets the water supply temperature at which the estimated total power consumption is minimized.

According to each aspect of the invention described above, it is possible to realize optimal operation of the heat source machine taking into account the power consumption generated on the load side.

1 is a diagram showing an overview of an air conditioning system according to a first embodiment. FIG. 2 is a diagram showing a configuration of a load of the air conditioning system according to the first embodiment. FIG. 2 is a diagram showing a configuration of a load of the air conditioning system according to the first embodiment. FIG. 2 is a diagram showing a processing flow of the heat source machine control device according to the first embodiment. FIG. 13 is a diagram showing an overview of an air conditioning system according to another embodiment.

First Embodiment
Hereinafter, a heat source machine control device (air conditioning system control device) according to a first embodiment and an air conditioning system including the same will be described with reference to FIGS. 1 to 4. FIG.

(Overview of the air conditioning system)
FIG. 1 is a diagram showing an overview of an air conditioning system according to a first embodiment.
The air conditioning system 1 according to the first embodiment is a central air conditioning system composed of a plurality of large chillers (heat source units 1a), an air handling unit (AHU), and a fan coil unit (FCU) (described in detail in FIG. 2).

As shown in FIG. 1, the air conditioning system 1 includes a plurality of heat source units 1a connected in parallel, a load 2, and a cooling tower 3. The air conditioning system 1 also includes a heat source unit control device 10 that controls the operation of the plurality of heat source units 1a.

Each heat source unit 1a has a typical heat pump configuration (a compressor, a condenser, an expansion valve, and an evaporator). Each heat source unit 1a removes heat from cold water circulating between the heat source unit 1a and the load 2 (cools the cold water) to produce cold water at a predetermined temperature.
The heat source unit 1a is, for example, a turbo chiller. In this case, the heat source unit 1a cools a refrigerant in a two-stage compression and two-stage expansion sub-cooling cycle, and cools cold water with the cooled refrigerant.
The turbo compressor is a centrifugal two-stage compressor that compresses a gaseous refrigerant. The condenser condenses and liquefies the high-temperature, high-pressure gas refrigerant compressed by the turbo compressor. The subcooler is provided downstream of the refrigerant flow in the condenser, and provides subcooling to the liquid refrigerant condensed in the condenser. The cooling heat transfer tube is inserted through the condenser and the subcooler, and cools the refrigerant with cooling water flowing through the tube. After cooling the refrigerant, the cooling water flowing through the cooling heat transfer tube dissipates heat to the outside in a cooling tower and flows through the cooling heat transfer tube again.
The high-pressure expansion valve and the low-pressure expansion valve expand the liquid refrigerant from the subcooler. The intercooler cools the liquid refrigerant expanded by the high-pressure expansion valve. The evaporator evaporates the liquid refrigerant expanded by the low-pressure expansion valve. The chilled-water heat transfer tube is inserted into the evaporator. The chilled water flowing through the chilled-water heat transfer tube is cooled by absorbing the heat of vaporization when the refrigerant evaporates.
In this way, the heat source unit 1 a cools the cold water and supplies it to the load 2 .
Furthermore, when the compressor of the heat source unit 1a is a refrigerator capable of variable speed control, the load control of the heat source unit 1a is performed by controlling the rotation speed of the turbo compressor and by controlling the capacity by the inlet guide vanes and the hot gas bypass pipe.
The electric motor drives the turbo compressor. The inverter controls the rotation speed of the electric motor, thereby controlling the rotation speed of the turbo compressor.
The inlet guide vane is provided at the refrigerant intake port of the turbo compressor, and controls the intake refrigerant flow rate to thereby control the capacity of the heat source unit 1a.
The hot gas bypass pipe is provided between the gas phase part of the condenser and the gas phase part of the evaporator to bypass the refrigerant gas. The hot gas bypass valve controls the flow rate of the refrigerant flowing through the hot gas bypass pipe. The hot gas bypass valve adjusts the hot gas bypass flow rate, allowing for more precise capacity control than the capacity control using the inlet guide vanes.
In the case of a refrigerator in which the compressor is a fixed speed control, the load is controlled by capacity control using the inlet guide vanes and the hot gas bypass pipe.

Pump P1 is one of the auxiliary devices on the heat source unit side in the air conditioning system 1, and is a water pump that can adjust the flow rate of cold water. The flow rate of cold water by pump P1 is controlled by the heat source unit control device 10, which will be described later. In this embodiment, pump P1 is provided in both the delivery side flow path and the return side flow path of the heat source unit 1a, but in other embodiments, this is not limited to this, and pump P1 may be provided in only one of them.

Pump P2 is one of the auxiliary devices on the heat source side of the air conditioning system 1, and is a water pump that can adjust the flow rate of cooling water. The flow rate of cooling water by pump P2 is also controlled by the heat source device control device 10, similar to pump P1.

The heat source device control device 10 controls the operation of multiple heat source devices 1a connected in parallel. Known heat source control devices operate at an operating point where the COP (Coefficient of Performance) of the heat source device is maximized depending on the load, but the heat source control device 10 according to this embodiment does not necessarily operate at an operating point where the COP of the heat source device 1a is maximized. The specific functions and processing contents of the heat source device control device 10 according to this embodiment will be described later.

(Load configuration)
FIG. 2 is a diagram showing a configuration of a load of the air conditioning system according to the first embodiment.
The configuration of the load 2 will be described in detail below with reference to FIG.

2, the load 2 according to this embodiment includes an air-conditioned space R which is, for example, an office room in a building, an air handling unit 20 (hereinafter also referred to as AHU 20) that performs ventilation and air conditioning of the air-conditioned space R, an AHU controller 21 that controls the AHU 20, and various fans F1, F2. The load 2 also includes a fan coil unit 30 (hereinafter also referred to as FCU 30) that performs air conditioning of the air-conditioned space R, an FCU controller 31 that controls the FCU 30, and a fan F11.
In the conditioned space R, there are indoor loads such as people, office equipment, and lighting. In addition, in the conditioned space R, it is required that the CO2 concentration does not exceed a specified upper limit, and outside air introduction management is performed according to the current CO2 concentration.

The AHU 20 is equipped with a cooling coil CC inside. While circulating indoor air and introducing outside air, the AHU 20 cools this air with the cooling coil CC and supplies it to the conditioned space R. Chilled water cooled to a predetermined temperature by the heat source unit 1a circulates through the cooling coil CC. As the AHU 20 circulates the indoor air, heat exchange occurs between the air and the chilled water via the cooling coil CC. As a result, cooled air is supplied to the room.

The AHU controller 21 introduces outside air as appropriate through the AHU 20 so that the CO2 (carbon dioxide) concentration in the conditioned space R does not exceed a specified upper limit. Specifically, the AHU controller 21 adjusts the amount of outside air introduced by controlling the air volume and damper opening of the supply air fan F1 and the return air fan F2 while monitoring the CO2 concentration in the conditioned space R. The CO2 concentration in the conditioned space R is obtained, for example, through a CO2 concentration meter CS installed indoors.

The FCU controller 31 determines the amount of air to be supplied to the room so that the target humidity of the indoor target conditions (e.g., 26°C/50%) preset in the conditioned space R is achieved. Specifically, the FCU controller 31 obtains the indoor temperature and humidity in the conditioned space R from the temperature and humidity sensor S1, and determines the amount of air to be supplied to the room so that this becomes the indoor target condition. For example, when the indoor humidity measured by the temperature and humidity sensor S1 significantly exceeds the indoor target condition, the FCU controller 31 increases the amount of air to be supplied to the room to lower the indoor humidity. On the other hand, when the indoor humidity is close to the indoor target condition, the FCU controller 31 reduces the amount of air to be supplied to the room. The amount of air to be supplied to the room is controlled by the fan F11.

(Functional configuration of heat source device control device)
FIG. 3 is a diagram illustrating a functional configuration of the heat source machine control device according to the first embodiment.
The heat source machine control device 10 according to the present embodiment includes a processor such as a CPU and operates according to a predetermined program. As shown in Fig. 3, the heat source machine control device 10 operates according to a predetermined program to perform the functions of a setting unit 100, a first calculation unit 101, a second calculation unit 102, an estimation unit 103, an introduction amount acquisition unit 104, and a total load acquisition unit 105.

The setting unit 100 sets the water supply temperature (cold water outlet temperature) of the heat source unit 1a. Here, the setting unit 100 and the estimation unit 103 (described later) estimate the total power consumption (power consumption on the heat source unit side and power consumption on the load side combined) that occurs according to the water supply temperature while changing the set value of the water supply temperature, and search for the water supply temperature that minimizes the estimated value of the total power consumption. In this way, the setting unit 100 sets the water supply temperature that minimizes the total power consumption. The method of estimating the total power consumption will be described later.

The first calculation unit 101 acquires information necessary to estimate the power (power consumption) generated mainly on the load side. Specifically, the first calculation unit 101 calculates the amount of air to be supplied to the load room according to the water supply temperature set by the setting unit 100.

The second calculation unit 102 acquires information necessary to estimate the power (power consumption) generated mainly on the heat source unit side. Specifically, the second calculation unit 102 calculates the water supply flow rate of the heat source unit according to the water supply temperature set by the setting unit 100.

The estimation unit 103 estimates the total power consumption on the heat source side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate.

The intake amount acquisition unit 104 acquires the amount of outside air intake for load 2.

The total load acquisition unit 105 acquires the total load of load 2 (the sum of the outdoor air intake load and the indoor load).

The recording medium 106 is a large-capacity auxiliary storage device such as a so-called HDD (hard disk drive) or SSD (solid state drive), and various information necessary for the processing of the heat source machine control device 10 is recorded in advance.
Specifically, a first power consumption table TB1 and a second power consumption table TB2 are recorded on the recording medium 106. The first power consumption table TB1 is an information table used when estimating the power consumption on the load side, and is an information table showing the correspondence between the amount of air supplied to the room and the power consumption on the load side. The second power consumption table TB2 is an information table used when estimating the power consumption on the heat source machine side auxiliary equipment (pumps P1, P2, cooling tower 3, etc.), and is an information table showing the correspondence between the water supply flow rate of chilled water and the power consumption on the heat source machine side auxiliary equipment.

(Processing flow of heat source device control device)
FIG. 4 is a diagram showing a process flow of the heat source machine control device according to the first embodiment.
The process flow shown in Fig. 4 is a process flow for determining an optimal chilled water temperature (supply water temperature setting value) to be produced by the heat source unit 1a. During operation of the air conditioning system 1, the process is steadily and repeatedly performed at regular time intervals.

First, the introduction amount acquisition unit 104 of the heat source device control device 10 acquires the outdoor air introduction amount for the load 2 (step S01). Here, the introduction amount acquisition unit 104 acquires the CO2 concentration in the conditioned space R through the CO2 concentration meter CS. Then, the introduction amount acquisition unit 104 acquires the outdoor air introduction amount according to the CO2 concentration acquired through the CO2 concentration meter CS. Here, the introduction amount acquisition unit 104 acquires the outdoor air introduction amount in the same manner as the AHU controller 21 determines the outdoor air introduction amount. For example, if the AHU controller 21 introduces more outdoor air the larger the change in the moving average of the CO2 concentration, the introduction amount acquisition unit 104 also acquires the outdoor air introduction amount according to the change in the moving average of the CO2 concentration.

Next, the total load acquisition unit 105 of the heat source machine control device 10 acquires the total load of the load 2 (step S02). Here, the "total load" is a value indicating the total load amount of the load 2, and in this embodiment, it is the sum of the outdoor air introduction load, which is a load according to the outdoor air temperature and humidity and the outdoor air introduction amount, and the above-mentioned indoor load. Here, the total load acquisition unit 105 acquires the outdoor air introduction amount specified in step S01 and the outdoor air temperature and humidity (e.g., 30°C/70%) measured by the temperature and humidity sensor S2, and calculates the outdoor air introduction load.
Next, the total load acquisition unit 105 calculates the indoor load by acquiring information such as the number of employees, etc. in the air-conditioned space R, the office equipment that is turned on, and the lighting devices that are turned on. When acquiring the number of employees, etc. in the air-conditioned space R, the total load acquisition unit 105 may refer to the entry and exit management information of the air-conditioned space R, for example.

Next, the setting unit 100 of the heat source unit control device 10 provisionally determines the temperature of the chilled water to be supplied by the heat source unit 1a (supply temperature setting value) to be one of a plurality of different candidate values.
The first calculation unit 101 of the heat source unit control device 10 calculates the amount of air supplied to the room controlled by the AHU 20, the AHU controller 21, the FCU 30, and the FCU controller 31 for the total load calculated in step S02 when the water supply temperature setting value of the heat source unit 1a is the provisionally determined value (step S03). Specifically, the first calculation unit 101 calculates the amount of air supplied to the room that should be achieved by the AHU 20, the AHU controller 21, the FCU 30, and the FCU controller 31, with reference to the AHU heat exchange amount, which is the amount of heat exchanged by the cooling coil CC of the AHU 20, the FCU heat exchange amount, which is the amount of heat exchanged by the cooling coil CC of the FCU 30, and the indoor target temperature condition (e.g., 26°C/50%).

Furthermore, the second calculation unit 102 of the heat source unit control device 10 calculates the flow rate (water supply flow rate) that the heat source unit 1a should supply water for the total load calculated in step S02 when the water supply temperature setting value of the heat source unit 1a is the provisionally determined value (step S04). Here, the second calculation unit 102 calculates the water supply flow rate of the heat source unit 1a by referring to the candidate value of the water supply temperature setting value provisionally determined by the setting unit 100 and the total load.

Next, the estimation unit 103 estimates the total power consumption corresponding to the provisionally determined candidate value for the water supply temperature setting value. Here, the estimation unit 103 first calculates (1) an estimated value of the power consumption generated on the load side, and (2) an estimated value of the power consumption generated on the heat source unit side. The total power consumption is the sum of (1) and (2) above.

(1) When calculating an estimated value of the power consumption generated on the load side, the estimation unit 103 refers to the amount of air supplied to the room calculated in step S03 and the first power consumption table TB1 (Figure 3). As described above, the first power consumption table TB1 records the total power consumption consumed by various fans (supply air fan F1, return air fan F2, etc. (see Figure 2)) for each amount of air supplied to the room that the load side (AHU 20 and AHU controller 21, FCU 30 and FCU controller 31) should achieve. The estimation unit 103 identifies the power consumption on the load side corresponding to the amount of air supplied to the room calculated in step S03 by referring to the first power consumption table TB1.

Next, the estimation unit 103 (2) calculates an estimated value of the power consumption generated on the heat source unit side by calculating (2a) the power consumption generated by the heat source unit 1a and (2b) the power consumption generated by the auxiliary equipment on the heat source unit side (pumps P1, P2, cooling tower 3, etc.).
The estimation unit 103 determines the power consumption generated by the heat source unit 1a (2a) based on the water supply temperature setting value provisionally determined by the setting unit 100. In general, the lower the water supply temperature, the greater the power consumption of the heat source unit 1a, and the higher the water supply temperature, the smaller the power consumption. The estimation unit 103 grasps in advance the relationship between the water supply temperature setting value and the power consumption in the heat source unit 1a, and obtains the power consumption generated by the heat source unit 1a (2a) based on this relationship.
For the power consumption generated by the auxiliary equipment on the heat source unit side of (2b), the estimation unit 103 refers to the water supply flow rate calculated in step S04 and the second power consumption table TB2 (FIG. 3). As described above, the second power consumption table TB2 records the total power consumption consumed by various pumps (pumps P1, P2, etc. (see FIG. 1)) and the cooling tower 3 for each water supply flow rate that the auxiliary equipment on the heat source unit side should achieve. The estimation unit 103 identifies the power consumption of the auxiliary equipment on the heat source unit side corresponding to the water supply flow rate calculated in step S04 by referring to the second power consumption table TB2.
The estimation unit 103 obtains an estimate of (2) the power consumption generated on the heat source unit side by calculating the sum of (2a) the power consumption generated in the heat source unit 1a and (2b) the power consumption generated by the auxiliary equipment on the heat source unit side.

The estimation unit 103 calculates the sum of (1) the estimated value of the power consumption generated on the load side and (2) the estimated value of the power consumption generated on the heat source unit side calculated as described above, thereby calculating an estimated value of the total power consumption corresponding to the provisionally determined candidate value of the water supply temperature setting value.

The setting unit 100 performs the processes in steps S03 to S05 for each of the different candidate water supply temperature setting values to calculate an estimated total power consumption. The setting unit 100 then determines, from among these candidate values, the candidate water supply temperature setting value that results in the smallest total power consumption as the optimal water supply temperature setting value (step S06).

(Action, Effect)
As described above, lowering the water supply temperature setting value increases the power consumption of the heat source unit 1a itself. However, for the same load (total load), the water supply flow rate on the heat source unit side can be reduced by the amount of the lowering of the water supply temperature of the heat source unit 1a. Therefore, by lowering the water supply temperature setting value of the heat source unit 1a, the power consumption of the auxiliary equipment on the heat source unit side can be reduced. In addition, in the AHU 20 and the FCU 30, the amount of heat exchanged in the AHU 20 and the FCU 30 increases by the amount of the lowering of the water supply temperature of the heat source unit 1a, and the ability to cool the indoor air is improved. Therefore, the amount of air supplied to the room on the load side is reduced by the amount of the lowering of the water supply temperature of the heat source unit 1a, and the power consumption generated on the load side is also reduced.
Therefore, when the ratio of the power consumption of the heat source unit 1a itself to the total power consumption of the auxiliary equipment on the heat source unit side and the power consumption generated on the load side (AHU 20 and FCU 30) is high, according to the heat source unit control device 10 of this embodiment, the water supply temperature setting value is determined so that the total power consumption of the entire system is minimized, even if the power consumption generated by the heat source unit 1a increases slightly.

As described above, the heat source machine control device 10 according to the first embodiment can realize optimal operation of the heat source machine taking into account the power consumption generated on the load side.

The second calculation unit 102 of the heat source unit control device 10 according to the first embodiment calculates the water supply flow rate of the heat source unit 1a according to the water supply temperature based on the total load including the amount of outdoor air introduced on the load side. In this way, the total load amount taking into account the amount of outdoor air introduced in the conditioned space R can be accurately estimated.

In addition, the estimation unit 103 of the heat source machine control device 10 in the first embodiment calculates the power consumption of fans F1, F2, F11, etc., which correspond to at least the amount of air supplied to the room, as the power consumption on the load side, and calculates the power consumption of auxiliary machines (pumps P1, P2, cooling tower 3, etc.), which correspond to at least the water supply flow rate, as the power consumption on the heat source machine side.
In this way, it is possible to more accurately estimate the power consumption generated on the load side and the power consumption generated on the heat source unit side according to the water supply temperature setting value (each of multiple candidate values).

Other Embodiments
In addition, the introduction amount acquisition unit 104 according to the first embodiment has been described as acquiring the amount of outside air introduction corresponding to the amount of change in the moving average of the CO2 concentration, but is not limited to this in other embodiments. For example, the introduction amount acquisition unit 104 according to other embodiments may calculate the amount of outside air introduction based on the change tendency of the deviation of the CO2 concentration from the management target value.
In this way, if there is a margin of error between the current CO2 concentration and the management target value, the amount of outside air introduced can be reduced, making it possible to extend the operation time with reduced load.

In addition, the heat source machine control device 10 according to the first embodiment has been described as acquiring the CO2 concentration of the conditioned space R through a CO2 concentration meter CS installed in the conditioned space R, but other embodiments are not limited to this aspect. The heat source machine control device 10 according to other embodiments may, for example, estimate the CO2 concentration based on the number of people present in the room instead of measuring the CO2 concentration. In this way, when a CO2 concentration meter is expensive, the same thing can be achieved by using the number of people present in the room that is managed separately by a building management system or the like.

In addition, instead of calculating the amount of outside air introduced each time, it is possible to create a table in advance to avoid situations where it takes a long time to calculate the solution. In this way, it is possible to perform the intended operation even when calculation time is a bottleneck or the calculation results are multi-peaked.

Also, since it would be impossible to capture the changing trend of the CO2 concentration if the introduction of outside air was completely stopped, a minimum amount of outside air can be set so that the management target value is not exceeded even when no one is present. In this way, it is possible to avoid a situation where the management target value is significantly exceeded even when the state changes from "no one present" to "people present" at the start of operations in an office building, for example.

It is also possible to learn the change trend of the CO2 concentration and determine the amount of outside air introduced based on the predicted value. The amount of outside air introduced may increase suddenly if the change trend is the only factor, but by controlling the ventilation volume according to the change trend pattern, it is possible to avoid needlessly increasing the ventilation volume.

In addition, in another embodiment, the heat source unit control device 10 may estimate the total load based on the product of the temperature difference between the chilled water outlet temperature and the chilled water inlet temperature in the heat source unit 1a and the chilled water flow rate, rather than estimating the indoor load and the outdoor air intake load separately and calculating their sum.

In addition, instead of the supply of cold water in the heat source side equipment being performed only by the multiple heat source units 1a, a heat storage tank 4 may be installed as shown in FIG. 5, and the supply of cold water may be shared between the heat storage tank 4 and the heat source unit 1a. In this case, by changing the time period during which heat is stored according to the electricity rate system, it is possible to reduce running costs even if the amount of power consumption is the same.

In the above-described embodiment, the various processes of the heat source machine control device 10 are stored in a computer-readable recording medium in the form of a program, and the above-described various processes are performed by the computer reading and executing this program. In addition, computer-readable recording media refers to magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, etc. In addition, this computer program may be distributed to a computer via a communication line, and the computer that receives this distribution may execute the program.

The above program may be for realizing some of the functions described above. Furthermore, it may be a so-called differential file (differential program) that can realize the functions described above in combination with a program already recorded in the computer system.

As described above, several embodiments of the present disclosure have been described, but all of these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope of the invention and its equivalents as described in the claims, as well as in the scope and gist of the invention.

<Additional Notes>
The air conditioning system control device (heat source device control device 10) described in each embodiment can be understood, for example, as follows.

(1) The air conditioning system control device according to the first aspect includes a setting unit 100 that sets the water supply temperature of the heat source unit 1a, a first calculation unit 101 that calculates the amount of air supplied to the room of the load 2 according to the water supply temperature, a second calculation unit 102 that calculates the water supply flow rate of the heat source unit 1a according to the water supply temperature, and an estimation unit 103 that estimates the total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate. The setting unit 100 sets the water supply temperature at which the estimated total power consumption is minimized.

(2) According to the air conditioning system control device of the second aspect, the first calculation unit 101 calculates the amount of air supplied to the room within a range in which the CO2 concentration does not exceed a specified upper limit value.

(3) According to the air conditioning system control device of the third aspect, the first calculation unit 101 calculates the amount of air to be supplied to the room within a range in which the relative humidity of the indoor air does not exceed a specified upper limit value.

(4) According to the air conditioning system control device of the fourth aspect, the second calculation unit 102 calculates the water supply flow rate of the heat source unit according to the water supply temperature based on the total load including the amount of outside air introduced on the load side.

(5) According to the heat source unit control device 10 of the fifth aspect, the estimation unit 103 calculates the power consumption of the fans (air supply fan F1, return air fan F2, etc.) corresponding to at least the amount of air supplied to the room as the power consumption on the load side, and calculates the power consumption of the auxiliary equipment (pumps P1, P2, cooling tower 3, etc.) corresponding to at least the water supply flow rate as the power consumption on the heat source unit side.

(6) The air conditioning system 1 according to the sixth aspect includes any one of the air conditioning system control devices (1) to (5) described above, and includes a heat storage tank 4 in addition to the heat source unit 1a as equipment constituting the heat source unit side.

(7) According to the seventh aspect of the air conditioning system control method, the method includes the steps of setting the water supply temperature of the heat source unit 1a, calculating the amount of air supplied to the room of the load 2 according to the water supply temperature, calculating the water supply flow rate of the heat source unit 1a according to the water supply temperature, and estimating the total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate. In the step of setting the water supply temperature of the heat source unit 1a, the water supply temperature that minimizes the estimated total power consumption is set.

(8) According to the program of the eighth aspect, the computer of the air conditioning system control device is caused to execute the steps of setting the water supply temperature of the heat source unit 1a, calculating the amount of air supplied to the room of the load 2 according to the water supply temperature, calculating the water supply flow rate of the heat source unit 1a according to the water supply temperature, and estimating the total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate. In the step of setting the water supply temperature of the heat source unit 1a, the water supply temperature that minimizes the estimated total power consumption is set.

1 Air conditioning system 10 Heat source device control device (air conditioning system control device)
100 Setting unit 101 First calculation unit 102 Second calculation unit 103 Estimation unit 104 Intake amount acquisition unit 105 Total load acquisition unit 106 Recording medium 2 Load 20 Air handling unit (AHU)
21 AHU controller 30 Fan coil unit (FCU)
31 FCU controller 4 Heat storage tank TB1 First power consumption table TB2 Second power consumption table

Claims (7)

A setting unit that sets the temperature of the cold water produced by the heat source device;
A total load acquisition unit that acquires a total load amount in a load including the air-conditioned space ;
a first calculation unit that calculates an amount of air to be supplied to the room by referring to an amount of heat exchanged in a cooling coil through which the cold water flows, an indoor target temperature, and the total load amount when the supply water temperature is set to a certain candidate value;
A second calculation unit that calculates a water supply flow rate of the heat source unit by referring to the candidate value of the water supply temperature and the total load amount;
an estimation unit that estimates total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate;
Equipped with
The setting unit sets a water supply temperature at which the estimated total power consumption is minimized,
The total load amount is the sum of an outside air introduction load, which is a load generated by introducing outside air into the air-conditioned space, and an indoor load, which is a load present in the air-conditioned space,
The total load acquisition unit calculates an outdoor air introduction load based on an outdoor air introduction amount corresponding to a CO2 concentration in the air conditioned space and the temperature and humidity of the outdoor air, and also calculates an indoor load by referring to at least entry and exit management information of the air conditioned space.
Air conditioning system control device. The air conditioning system control device according to claim 1 , wherein the first calculation unit calculates the amount of air supplied to the room within a range in which the CO2 concentration does not exceed a specified upper limit value. The air conditioning system control device according to claim 1 or 2, wherein the first calculation unit calculates the amount of air to be supplied to the room within a range in which the relative humidity of the indoor air does not exceed a specified upper limit value. The air conditioning system control device according to any one of claims 1 to 3, wherein the estimation unit calculates the power consumption of a fan according to at least the amount of air supplied to the room as the power consumption on the load side, and calculates the power consumption of an auxiliary device according to at least the water supply flow rate as the power consumption on the heat source unit side . The air conditioning system control device according to any one of claims 1 to 4 ,
The equipment constituting the heat source side includes a heat storage tank in addition to the heat source machine.
Air conditioning system. Setting a temperature of cold water produced by the heat source device;
Obtaining a total load amount in a load including a conditioned space ;
a step of calculating an amount of air to be supplied to the room by referring to an amount of heat exchanged in a cooling coil through which the cold water flows, an indoor target temperature, and the total load amount when the supply water temperature is set to a certain candidate value;
Calculating a water supply flow rate of the heat source unit by referring to the candidate value of the water supply temperature and the total load amount;
A step of estimating total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate;
having
In the step of setting the water supply temperature of the heat source device, a water supply temperature that minimizes the estimated total power consumption is set ,
The total load amount is the sum of an outside air introduction load, which is a load generated by introducing outside air into the air-conditioned space, and an indoor load, which is a load present in the air-conditioned space,
In the step of acquiring the total load amount, an outdoor air introduction load is calculated based on the outdoor air introduction amount corresponding to the CO2 concentration in the air-conditioned space and the temperature and humidity of the outdoor air, and an indoor load is calculated by referring to at least the entry and exit management information of the air-conditioned space.
A method for controlling an air conditioning system. The computer of the airborne system control device
Setting a temperature of cold water produced by the heat source device;
Obtaining a total load amount in a load including a conditioned space ;
a step of calculating an amount of air to be supplied to the room by referring to an amount of heat exchanged in a cooling coil through which the cold water flows, an indoor target temperature, and the total load amount when the supply water temperature is set to a certain candidate value;
Calculating a water supply flow rate of the heat source unit by referring to the candidate value of the water supply temperature and the total load amount;
A step of estimating total power consumption on the heat source unit side and the load side according to the water supply temperature, the amount of air supplied to the room, and the water supply flow rate;
A program for executing
In the step of setting the water supply temperature of the heat source device, a water supply temperature that minimizes the estimated total power consumption is set ,
The total load amount is the sum of an outside air introduction load, which is a load generated by introducing outside air into the air-conditioned space, and an indoor load, which is a load present in the air-conditioned space,
In the step of acquiring the total load amount, an outdoor air introduction load is calculated based on the outdoor air introduction amount according to the CO2 concentration in the air-conditioned space and the temperature and humidity of the outdoor air, and an indoor load is calculated by referring to at least the entry and exit management information of the air-conditioned space.
program.

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