JP5082585B2 - Air conditioning system - Google Patents

Description

  The present invention relates to an air conditioning system, and more particularly, to an air conditioning system configured to perform control to minimize an evaluation function.

  In the operation of an air conditioning system, for example, control that minimizes an evaluation function for, for example, energy consumption of the entire system, system operating cost, or carbon dioxide emission from the system, that is, more efficient operation is performed. It is common to perform such control. Conventionally, in the case of an air conditioning system having a plurality of heat source units, such control is conventionally performed by setting the number of operating heat source units to the minimum necessary according to the load (air conditioning load) due to a given air conditioning condition, The control was performed to minimize the evaluation function on the assumption of the set number of operating units. In other words, the number of operating heat source units was fixed to the minimum necessary in relation to the load, and control for minimizing the evaluation function was performed as control of the operating state of the heat source unit operating with the fixed number of units. (For example, Patent Documents 1 to 4).

  The reason why such control has been performed in the past is that, for example, minimizing the number of operating heat source units in relation to the load is a basic premise for minimizing energy consumption, for example. is there.

  By the way, as a control of the operating state of a heat source machine or the like for minimizing energy consumption, a control method for changing the flow rate of a cold / hot medium is known from Patent Document 5. The inventors of the present invention have repeated simulation and operation data analysis for the case where the air conditioning system of a plurality of heat source devices is controlled by the control method disclosed in Patent Document 5. As a result, the knowledge that a small number of operating heat source units may not necessarily reduce energy consumption, that is, increasing the number of operating units under the same load condition may reduce energy consumption. . This means that the evaluation function may be made smaller by controlling the number of operating heat source units other than the relationship with the load.

JP 2006-275492 A JP 2006-266520 A JP 2006-220345 A JP 2005-134110 A JP 2004-53127 A

  The present invention has been made on the basis of the above-described new knowledge, and its problem is to incorporate the control of the number of operating heat source units into the evaluation function minimization for an air conditioning system having a plurality of heat source units. The purpose is to make it possible to further increase the efficiency in terms of energy consumption, operating costs, or reduction of carbon dioxide emissions.

In the present invention, in order to solve the above-described problem, the number of operating units is controlled so as to have a plurality of heat source units and set the number of operating units for the plurality of heat source units according to a load due to a given air conditioning condition. In the air conditioning system, the operation number control is performed with respect to the load correlated operation number setting process for determining whether the operation number is correct in relation to the current air conditioning load and the energy consumption of the plurality of heat source units. Evaluation function correlation operation number setting process for changing the number of operating units in order to minimize the evaluation function, the load correlation operation number setting process is an air conditioning load obtained by adding a predetermined adjustment load amount to the current air conditioning load. At least one of the adjustment load amount subtraction current load, which is the air conditioning load obtained by subtracting the predetermined adjustment load amount from the current adjustment load amount addition current load and the current air conditioning load, The evaluation function correlated operation number setting process is performed only when the operation number is not set in the load correlation operation number setting process. The adjustment load amount addition current load and the adjustment load amount subtraction current load are simulated to determine whether the number of heat source units can be increased or decreased, and the adjustment load amount addition is performed. When both the current load and the adjusted load subtraction current load can be increased or decreased, the number of units to be operated is set so that the evaluation function of the energy consumption of the plurality of heat source units is minimized. It is characterized by only increasing or decreasing .

  By controlling the number of operating units in this way, it is possible to incorporate the control of the number of operating heat source units into the minimization of the evaluation function, and it is possible to further increase the efficiency related to the reduction of energy consumption, operating cost, or carbon dioxide emission.

In this case, the evaluation function correlation operation number setting processing is performed by simulating the evaluation function for the current operation number, the evaluation function for the number increase operation, and the evaluation function for the number decrease operation for the energy consumption of the plurality of heat source units. What is necessary is just to increase | decrease or reduce the said operation number only by the said unit number so that it may obtain | require and compare and the said evaluation function may become the minimum .

The above-described air conditioning system, upon comparison of the evaluation function, the volume increase of operation and as an evaluation function of each of the number down operation, correction evaluation function obtained by adding a predetermined correction value to the evaluation function obtained by the simulation Is preferably used.

  By doing so, it is possible to suppress the frequency of switching the number of operating units while incorporating the control of the number of operating heat source units into the evaluation function minimization. In other words, as a correction value to be added to the evaluation function, by using a transient increase such as energy consumption that occurs when starting and stopping the heat source unit, etc., it is possible to control the number of units in operation, and as a result, the number of units in operation. The evaluation function can be minimized while suppressing the switching frequency. Further, since the frequency of switching the number of operating units can be suppressed, it is possible to suppress the consumption of the heat source device and the like.

  According to the present invention as described above, for an air conditioning system having a plurality of heat source units, control of the number of operating heat source units can be incorporated into the evaluation function minimization, and energy consumption, operating cost, carbon dioxide emission reduction, etc. It will be possible to further increase the efficiency regarding.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 shows a configuration of an air conditioning system according to the first embodiment. The air-conditioning system ES of this embodiment is a case where three systems are provided with heat source units, and cooling towers 1a, 1b, 1c, cooling water pumps 2a, 2b, 2c, absorption chiller / heater units (heat source units) 3a, 3b, 3c, cold / hot water pumps (cool / heat medium pumps) 4a, 4b, 4c, air conditioners 5a, 5b, 5c, and a cold / hot water return header 10, a cold / hot water return load side header 11, and a cold / hot water return heat source side header 12 And a control device 13.

  In the cooling towers 1a, 1b, and 1c, inverters 21a, 21b, and 21c are connected to respective fans for air blowing (not shown), and these inverters 21a, 21b, and 21c are controlled by commands from the control device 13. The air volume can be changed.

  The cooling water pumps 2a, 2b, and 2c are connected to inverters 22a, 22b, and 22c, respectively, and the flow rate of the cooling water can be changed by controlling the inverters 22a, 22b, and 22c with a command from the control device 13. Has been.

  The cold / hot water pumps 4a, 4b, and 4c are connected to inverters 23a, 23b, and 23c, respectively, and the inverters 23a, 23b, and 23c are controlled by commands from the control device 13 to control the flow of cold / hot water that is a cold / hot heat medium. It can be changed.

  The absorption chiller / heater 3a, 3b, 3c can change the control target value of the chilled / hot water outlet temperature in response to a command from the control device 13, and the flow rates of the cooling water and the chilled / warm water are both predetermined rated flow rates. The ratio can be changed within a range up to 1/2, for example.

  Each of the air conditioners 5a, 5b, and 5c includes cold / hot water coils 6a, 6b, and 6c and fans 8a, 8b, and 8c, and inverters 24a, 24b, and 24c are connected to the fans 8a, 8b, and 8c, respectively. By controlling the inverters 24a, 24b, and 24c with a command from the control device 13, the amount of ventilation in the air conditioners 5a, 5b, and 5c can be changed.

  As described above, the air conditioning system ES of the present embodiment is configured to control the air flow rate in the cooling tower 1, the flow rate of cooling water, the flow rate of cold / hot water, the outlet temperature of the cold / hot water in the absorption chiller / heater 3, and the air flow rate in the air conditioner 5. Although the control to adjust can be performed and the illustration of the mechanism is omitted, control to adjust the temperature of cooling water, cold / hot water and supply air can also be performed, and evaluation of each system of the heat source machine by these controls A function, specifically, an evaluation function for energy consumption can be minimized, that is, energy consumption can be minimized. The energy consumption in this case is converted into the primary energy of power and gas in the power consumption in each of the cooling tower 1, the cooling water pump 2, the cold / hot water pump 4, and the fan 8 and the gas consumption in the absorption chiller / heater 3. It is calculated as the sum of the coefficients.

  Control in the air conditioning system ES is performed by the control device 13. For this purpose, each device of the air conditioning system ES is provided with a communication end 14, which is connected to the control device 13 via a communication network 15 (not shown) so that it can communicate with the control device 13. Output data of various sensors (not shown) (for example, a sensor for detecting the amount of air blown from the air conditioner 5, a sensor for detecting the temperature of the air conditioner 5, a sensor for detecting the room temperature, a sensor for detecting the outside air temperature, etc.) Can be taken into the control device 13. Note that the temperature data taken into the control device 13 is the wet bulb temperature when the heat source is water-cooled, and the dry bulb temperature when it is air-cooled.

  In the air conditioning system ES that enables the control as described above, the relationship between the cooling load and the energy consumption is as shown in FIG. 2 as an example. In FIG. 2, with respect to the number of operating operating units of the absorption chiller / heater 3 as a heat source unit, the load-consumption energy curve 51 in the case of one unit, the load-consumption energy curve 52 in the case of two units, and the load in the case of three units- A consumption energy curve 53 is shown. As seen in this figure, the load-consumption energy curve for each number of operating heat source units in the air conditioning system ES has an intersection Pa between the load-consumption energy curves 51 and 52, and the load-consumption energy curves 52 and 53. Has an intersection point Pb. This means that by performing optimal control according to the load as described above, the efficiency at the partial load is greatly improved. For this reason, for example, it is better to operate two units even in a load range where one unit can be operated. This means that energy consumption may be reduced as a whole system.

  Here, the air-conditioning system and the air-conditioning system ES having a configuration that cannot control the flow rate of cooling water and cold / hot water as in the air-conditioning system ES will be compared in terms of load-energy consumption characteristics. The air-conditioning system ESp shown in FIG. 3 is the same as the air-conditioning system ES in terms of equipment configuration, and does not include the inverters 21 to 23 in the air-conditioning system ES, and can control the flow rate of cooling water and cold / hot water. It is different in that it cannot be done. In the case of such an air conditioning system ESp, the relationship between the cooling load and the energy consumption is as shown in FIG. In FIG. 4, with respect to the number of operating operating units of the absorption chiller / heater 3 as a heat source unit, the load-consumption energy curve 61 for one unit, the load-consumption energy curve 62 for two units, and the load for three units- A consumption energy curve 63 is shown. As seen in this figure, the load-energy consumption curves for each number of operating heat source units in the air conditioning system ESp do not cross each other. This means that minimizing the number of operating heat source units in relation to the load is a basic premise for minimizing energy consumption.

  In the air conditioning system ES, by using the load-energy consumption characteristics as described above, the efficiency of energy consumption can be further increased. Below, the operation number control performed for it is demonstrated. The number of operating units is controlled by the control device 13. For this purpose, the control device 13 includes a simulation unit 31 and an operation number setting unit 32. The simulation unit 31 calculates whether the operation with a given operation number is possible in relation to the current load. The operation function setting unit 32 calculates the evaluation function for the operation by the number of units under the current load, specifically, the energy consumption, and uses the result obtained by the simulation unit 31. Set the number of operating units. The flow of processing in such operation number control is shown in FIG. In the following description, the case of cooling will be described, but the description also applies to the case of heating.

  The operation number control of FIG. 5 includes each processing of Step 101 to Step 119, and one control cycle is performed by setting the operation number of the absorption chiller / heater 3 (switching the operation number or maintaining the current operation number). The control cycle is repeated at an interval of about 10 to 15 minutes, for example. In addition, starting and stopping of the absorption chiller / heater 3 for switching the number of operating units are accompanied by starting and stopping of each device such as the cooling tower 1, the cooling water pump 2, the chilled / hot water pump 4, and the air conditioner 5. .

  Steps 101 to 106 are load correlation operation number setting processing for determining whether or not the number of operating units is appropriate in relation to the current cooling load and changing the number of operating units. In this load correlation operation number setting process, first, as step 101, the current number operation that is the operation with the current number of operations for the cooling load obtained by adding a predetermined adjustment load amount to the current cooling load (adjustment load amount addition current load). Is calculated by simulation. Here, whether or not the operation is possible in the case of step 101 is determined as whether or not the set air-conditioning condition is satisfied, that is, whether or not it is possible to cool to the room temperature of the set air-conditioning condition. .

  In step 102, it is determined whether or not driving is possible based on the calculation result in step 101. If the determination result in step 102 is negative, it means that the cooling load is increased by about the above-mentioned adjusted load amount and the operation cannot be performed with the current number of operating units. In the example shown in the figure, it is increased by one). When the process of step 103 is performed, the process for one control cycle is completed.

  If the determination result of step 102 is affirmative, the process proceeds to step 104. In step 104, whether or not the current number of units can be operated is calculated by simulation for a cooling load obtained by subtracting the adjustment load amount from the current cooling load (adjustment load amount subtraction current load). Here, whether or not operation is possible in the case of step 104 is determined as whether or not the on / off operation is performed when the cooling load is below the lower limit value of the operable range of the absorption chiller / heater 3 in the current number of operating units. In the case of ON / OFF operation, the operation becomes impossible.

  In step 105, it is determined whether or not driving is possible based on the calculation result in step 104. If the determination result in step 105 is negative, it means that the cooling load is reduced by about the above-mentioned adjustment load amount, and the operation cannot be performed with the current number of operating units. In the example in the figure, it is reduced by one). When the process of step 106 is performed, the process for one control cycle is completed. Here, even if the determination result in step 105 is negative, if the number of operating units is one, the number of operating units cannot be reduced, and therefore processing for maintaining the current number of operating units is performed. However, illustration of the processing is omitted.

  As described above, in the setting control of the number of operating units in relation to the cooling load, whether or not the operation is possible with respect to the current load for adjustment load addition and the current load for adjustment load subtraction is determined by whether or not the operation is possible in relation to the load. This is to provide a margin for the determination. Therefore, the adjustment load amount is appropriately set for the purpose, and for example, a value of about 5 to 10% of the current load is preferably used.

  Step 107 to step 119 is an evaluation function correlation operation number setting process for changing the number of operating units in order to minimize the evaluation function for energy consumption, and is performed when the number of operating units is not set by step 105. Is called. In other words, when the determination in step 105 is made and the result is affirmative, the process proceeds to step 107, and first, the energy consumption A is calculated as an evaluation function by performing simulation with the current cooling load for the current unit operation.

  In step 108, for each of the above-described adjusted load amount addition current load and adjusted load amount subtraction current load, the number increase operation that is an operation by the number of units increased by a predetermined number of units (one in the example in the figure) from the current operation number. Is calculated by simulation.

In step 109, it is determined whether or not driving is possible based on the calculation result in step 108. The determination of whether or not the operation can be performed in Step 109 is affirmative on the condition that the adjustment load amount addition current load and the adjustment load amount subtraction current load can be operated, and the adjustment load amount addition current load and the adjustment load amount subtraction. If any one of the current loads cannot be operated, the result is negative.

  If the determination result of step 109 is affirmative, the process proceeds to step 110. In step 110, whether or not the operation is possible is calculated by performing a simulation with the current cooling load for the number increase operation, and the energy consumption B is calculated as an evaluation function.

In step 111, based on the calculation result in step 110, it is determined whether or not driving is possible and the amount of energy consumption is determined. The determination of the amount of energy consumption is made as a determination as to whether or not the energy consumption amount B is smaller than the energy consumption amount A for the energy consumption amount A for the current unit operation and the energy consumption amount B for the number increase operation. However, the energy consumption amount B is compared with the energy consumption amount A as “B + X” which is a correction evaluation function (correction energy consumption amount) obtained by adding a predetermined correction value (energy consumption correction amount) X. Here, as the correction value X, the absorption chiller / heater 3 and the devices that start and stop together with the absorption chiller / heater 3 are each about a transient increase such as the energy consumed when starting and stopping (for example, 3 of the rated energy consumption of each device). It is preferable to use about 10 to 10%. By doing in this way, as shown in FIG. 2, it can be set as the operation number control which considered the transient increase of the energy consumption at the time of starting of the absorption cold / hot water machine 3 etc., and a stop. That is, if the energy consumption correction amount X is not added, the number of operating units is switched at the intersection Pa or the intersection Pb, whereas by adding the energy consumption correction amount X, for example, Like the switching points SPa to SPd, it is biased toward the side with a larger load (when increasing the number of operating units) or the side with a smaller load (when decreasing the number of operating units) than the intersections Pa and Pb. This means that the number of operating units is not switched in the range of the energy consumption correction amount X, so that the frequency of switching the number of operating units is suppressed. Will be taken into account. As a result, the frequency of switching the number of operating units can be suppressed while performing more efficient energy consumption minimization control, and the consumption of the absorption chiller / heater 3 can be suppressed.

  If the determination result in step 111 is affirmative, that is, if the operation is possible and the corrected energy consumption (correction evaluation function) B + X for the unit operation is smaller than the energy consumption A for the current unit operation, the absorbed cold / hot water Since increasing the number of operating units 3 can reduce energy consumption, the process proceeds to step 112, and the number of operating units is increased by the unit number (in the example shown in the figure). When the process of step 112 is performed, the process for one control cycle is completed.

  When the determination result of step 109 is negative and when the determination result of step 111 is negative, the process proceeds to step 113 respectively. In step 113, the number-reduced operation, which is an operation by the number of units reduced by a predetermined number of units (one in the example in the figure) from the current number of operations for each of the adjusted load amount addition current load and the adjusted load amount subtraction current load. Is calculated by simulation.

  In step 114, it is determined whether or not driving is possible based on the calculation result in step 113. As in step 109, the determination as to whether or not the operation can be performed in step 114 is affirmative on the condition that the adjustment load amount addition current load and the adjustment load amount subtraction current load can be operated. If either of the load and the subtraction current load subtraction current operation is not possible, the result is negative.

  If the determination result in step 114 is negative, the process proceeds to step 115, where the current number of operating units is maintained. When the process of step 115 is performed, the process for one control cycle is completed.

  On the other hand, if the determination result of step 114 is affirmative, the process proceeds to step 116. In step 116, whether or not the operation is possible is calculated by performing a simulation with the current cooling load for the number-decreasing operation, and the energy consumption C is calculated as an evaluation function.

In step 117, based on the calculation result in step 116, it is determined whether or not the vehicle can be operated and the amount of energy consumption is determined. The determination of the amount of energy consumption is made as a determination as to whether or not the energy consumption amount C is smaller than the energy consumption amount A with respect to the energy consumption amount A for the current unit operation and the energy consumption C for the number reduction operation. However, the consumed energy amount C is compared with the consumed energy amount A as “C + X”, which is a correction evaluation function obtained by adding the consumed energy correction amount X in the same meaning as the consumed energy amount B.

  If the determination result in step 117 is affirmative, that is, if the operation is possible and the additional energy consumption additional energy consumption (corrected evaluation function) C + X for the reduced unit operation is smaller than the current energy consumption A for the current unit operation, Since the energy consumption can be reduced by reducing the number of operating cooling / heating water heaters 3, the process proceeds to step 118, and the number of operating units is decreased by one unit (in the example shown in the figure). When the process of step 112 is performed, the process for one control cycle is completed.

  On the other hand, if the determination result in step 117 is negative, the process proceeds to step 119, where the current number of operating units is maintained. When the process of step 119 is performed, the process for one control cycle is completed.

  FIG. 6 shows the flow of processing in the operation number control performed by the air conditioning system according to the second embodiment. The equipment configuration of the air conditioning system of the present embodiment is the same as the air conditioning system ES of FIG. In the operation number control of the present embodiment, an evaluation function is first obtained for each of the above-described current number operation, number increase operation, and number decrease operation, and then an operation that minimizes the evaluation function is selected by comparing each evaluation function. Set the number of operating units. Such operation number control includes each process of step 201 to step 215, and the process for one control cycle is completed when the number of operation of the absorption chiller / heater 3 is set.

  Step 201 to step 206 is a load correlation operation number setting process for determining whether or not the operation number is appropriate in relation to the current cooling load and changing the operation number, and is the same as step 101 to step 106 in FIG. It is.

  Steps 207 to 215 are the same evaluation function correlation operation number setting process as in the case of the first embodiment. If the determination in step 205 is made and the result is affirmative, operation is performed up to step 205. This is done when the number is not set.

  If the determination result at step 205 is positive, the process proceeds to step 207. In step 207, a simulation is performed with the current cooling load for each of the current unit operation, the unit increase operation, and the unit decrease operation as in the first embodiment, and the energy consumption A is calculated for the current unit operation. On the other hand, with regard to the number-increasing operation and the number-decreasing operation, whether or not the current cooling load can be operated is calculated on the condition that the adjustment load amount addition current load and the adjustment load amount subtraction current load can be operated. At the same time, energy consumption B and energy consumption C are calculated as evaluation functions.

  In step 208, it is determined which one of the energy consumption amount A for the current unit operation, the energy consumption B for the number increase operation, and the energy consumption C for the number decrease operation is minimum. However, for the same reason as in the first embodiment, the consumed energy amount B and the consumed energy amount C are compared as “B + X” or “C + X”, which are correction evaluation functions obtained by adding the consumed energy correction amount X. .

  If it is determined in step 208 that the energy consumption A is the minimum, the process proceeds to step 209, where the current number of operating units is maintained. When the process of step 209 is performed, the process for one control cycle is completed.

  If it is determined in step 208 that the consumed energy amount B is the minimum, the process proceeds to step 210, and the operation feasibility calculation result in step 207 is determined. If the determination result in step 210 is affirmative, the process proceeds to step 211 to increase the number of operating units by the unit number. When the process of step 211 is performed, the process for one control cycle is completed. On the other hand, if the determination result of step 210 is negative, the process proceeds to step 212, where the current number of operating units is maintained. When the process of step 209 is performed, the process for one control cycle is completed.

  If it is determined in step 208 that the consumed energy amount C is the minimum, the process proceeds to step 213, and the operation feasibility calculation result in step 207 is determined. If the determination result in step 213 is affirmative, the process proceeds to step 214 to decrease the number of units operated by the unit number. When the process of step 214 is performed, the process for one control cycle is completed. On the other hand, if the determination result in step 213 is negative, the process proceeds to step 215 to set the current number of operating units to be maintained. When the process of step 215 is performed, the process for one control cycle is completed.

  In the above embodiment, the number of operating units is set using the result of the simulation performed during operation. Instead of this, a simulation is performed in advance for each unit load obtained by dividing the load into appropriate units. It is also one of the preferred embodiments that the correspondence between the load and the optimum operation number is tabulated by obtaining the optimum operation number by using the load-optimum operation number table to control the operation number. . For such a load-optimum operation number table method, the operation number control method of the second embodiment as described above is particularly suitable.

  Next, a third embodiment will be described. The equipment configuration of the air conditioning system of this embodiment is basically the same as that of the air conditioning system ES of FIG. However, the refrigeration capacities of the absorption chiller heaters 3a, 3b, and 3c are different. Here, it is assumed that the ratio of the refrigerating capacity is 3a: 3b: 3c = 1: 2: 3. When the refrigeration capacities of the absorption chiller / heater units 3a, 3b, and 3c are different from each other in this way, the range of the cooling load for performing the above-described simulation is set in advance, and the current cooling load for performing the simulation falls within that range. Only the combination of the hot and cold water machines 3 is simulated. By doing in this way, the control which considered the difference in refrigerating capacity at the time of the setting of the number of operation can be performed effectively. FIG. 7 is an explanatory diagram of an example of such load-simulation range data. As can be seen in the figure, there are seven possible combinations for “operation” indicated by ○ and “stop” indicated by × for the three systems of the absorption chiller / heaters 3a, 3b and 3c. The load-simulation range data is created by obtaining the load-simulation range L in advance according to the total refrigeration capacity at.

  As mentioned above, although the form for implementing this invention was demonstrated, these are only typical examples, This invention can be implemented with various forms in the range which does not deviate from the meaning. For example, in the above embodiments, the evaluation function is used for energy consumption, but an evaluation function for operating costs and carbon dioxide emissions may be used.

It is a figure which shows the structure of the air conditioning system by 1st Embodiment. It is a figure which shows the example of the relationship between the cooling load and energy consumption in the air conditioning system of FIG. It is a figure which shows the structure of the air conditioning system compared with the air conditioning system by 1st Embodiment. It is a figure which shows the example of the relationship between the cooling load and energy consumption in the air conditioning system of FIG. It is a figure which shows the flow of a process in the operation number control performed with the air conditioning system by 1st Embodiment. It is a figure which shows the flow of a process in the operation number control performed with the air conditioning system by 2nd Embodiment. It is a figure for demonstrating load-simulation range data.

Explanation of symbols

3 absorption cold water heater (heat source machine)
13 Control device 31 Simulation means 32 Operating unit setting means ES Air conditioning system

Claims (3)

In an air conditioning system that has a plurality of heat source units and is configured to control the number of operating units to set the number of operating units for the plurality of heat source units according to a load due to a given air conditioning condition,
The operation number control includes a load correlation operation number setting process for determining whether or not the operation number is appropriate in relation to the current air conditioning load, and a minimum evaluation function for the energy consumption of the plurality of heat source units. Including an evaluation function correlation operation number setting process for changing the number of operations to achieve
The load correlation operation number setting process is an air conditioning load obtained by subtracting a predetermined adjustment load amount from an adjustment load amount addition current load that is an air conditioning load obtained by adding a predetermined adjustment load amount to the current air conditioning load and the current air conditioning load. Adjustment load amount subtraction Calculate at least one of the current loads by simulation whether or not operation with the current number of operating units is possible,
The evaluation function correlation operation number setting process is performed after the load correlation operation number setting process only when the operation number is not set in the load correlation operation number setting process, and the adjusted load amount addition current load and the Simulate whether the number of heat source units can be increased or decreased for the adjusted load amount subtracting current load, and both the adjusted load amount added current load and the adjusted load amount subtracted current load are simulated. An air conditioning system characterized in that, when the number increase operation or the number decrease operation is possible, the operation number is increased or decreased by a unit number so that the evaluation function of the energy consumption of the plurality of heat source units is minimized . In the evaluation function correlation operation number setting process, the evaluation function in the current operation number, the evaluation function in the number increase operation, and the evaluation function in the number decrease operation are obtained by simulation and compared with respect to the energy consumption of the plurality of heat source units. The air conditioning system according to claim 1, wherein the number of operating units is increased or decreased by the unit number so that the evaluation function is minimized . Upon comparison of the evaluation function, and wherein the volume increase operation and as an evaluation function of each of the number down operation, was to use a correction evaluation function obtained by adding a predetermined correction value to the evaluation function obtained by the simulation The air conditioning system according to claim 2 .

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