JP2011247564A - Air conditioning system and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system that is suppressed in the power consumption of an air conditioner to the minimum using a heat pump with underground heat as a heat source, and to provide its control method.SOLUTION: The air conditioning system 10 includes: a heat exchanger using the underground heat; a cold/warm water pump 50 which circulates cold/warm water to the heat exchanger; an inverter 52 which changes the number of revolutions of the cold/warm water pump 50; the air conditioner 20 which cools or warms the heat exchanger by using the cold/warm water circulating in the heat exchanger; a first detector for calculating an in-chamber load of the air conditioner 20; a second detector for calculating a cold/warm water load; a simulator 62 which calculates system COP by calculating the in-chamber load, the cold/warm water load, the first power consumption of the cold/warm water pump 50, and the second power consumption of the air conditioner 20, and selects a clod/warm water flow rate which becomes the maximum in the system COP; and a controller 64 which controls the cold/warm water pump 50 by using a frequency setting value of the inverter 52 of the cold/warm water flow rate which becomes the maximum in the system COP.

Description

  The present invention relates to an air conditioning system using underground heat and a control method thereof.

  There is an air conditioning system that uses technology that can reduce emissions of global warming gases such as carbon dioxide and that can reduce the energy consumed by the heat pump by operating the heat pump using geothermal heat at a constant temperature throughout the year as a heat source.

  Patent Document 1 discloses a method for operating a geothermal heat utilization system using such a geothermal heat pump. The ground heat utilization system of Patent Document 1 is connected to a ground heat exchanger embedded in the ground, a heat pump for collecting and radiating heat through a heat medium circulated in the ground heat exchanger, and a heat pump. An operation method of a geothermal heat utilization system including a load machine and a circulation pump for circulating a heat medium in the underground heat exchanger, and controls a variable flow rate of the circulation pump.

JP 2009-63267 A

  In a geothermal heat pump system, generally cold / hot water is conveyed into the ground during operation to collect heat or exhaust heat from the ground. In this system, there is a problem that the pumping power of cold / hot water that transports heat accounts for a large proportion of the entire system, and there is a demand for reduction in power consumption of the entire system, including a reduction in the power of transportation.

  Therefore, in order to solve the above-described problems of the prior art, an object of the present invention is to provide an air conditioning system that uses the heat pump that uses geothermal heat as a heat source to minimize the power consumption of the air conditioner, and a control method thereof. .

  The air conditioning system of the present invention includes a heat exchanger that uses underground heat, a cold / hot water pump that circulates cold / hot water in the heat exchanger, an inverter that changes the number of rotations of the cold / hot water pump, and the heat exchanger An air conditioner that cools or heats through the cold / hot water circulated, first detection means for calculating an indoor load of the air conditioner, and the cold temperature that circulates between the heat exchanger and the air conditioner A second detector for calculating a cold / hot water load of water; and the indoor load is calculated based on a measured value of the first detector; and the cold / hot temperature is calculated based on a measured value of the second detector. A water load, a first power consumption of the cold / hot water pump, and a second power consumption of the air conditioner are calculated, and a system COP is calculated based on the first and second power consumptions and the indoor load. , Calculated by changing the flow rate of the cold / hot water A simulator that performs a simulation for selecting a maximum cold / hot water flow rate among the system COPs, and a controller that controls the cold / hot water pump with a frequency setting value of the inverter for the cold / hot water flow rate at which the system COP is the maximum. It is characterized by having prepared.

  In this case, the simulator pre-measures the first and second detection means, the indoor load, the cold / hot water load, and the cold / hot water flow rate at which the system COP is maximized or the frequency setting value of the inverter. The frequency setting value of the inverter may be extracted from the database according to the measured value detected by the second detecting means and the measured value detected by the first detecting means. .

  In this case, the database includes the geothermal temperature, the indoor load, the heat exchanger cold / hot water inlet temperature, the cold / hot water flow rate that minimizes the energy consumption of the entire system, or the frequency setting value of the inverter. It may be a control table indicating a relative relationship.

  The control method of the air conditioning system of the present invention includes a heat exchanger that uses geothermal heat, a cold / hot water pump that circulates cold / hot water in the heat exchanger, an inverter that changes the number of rotations of the cold / hot water pump, An air conditioner that cools or heats through the cold / hot water circulated through a heat exchanger, first detection means for calculating an indoor load of the air conditioner, and circulates between the heat exchanger and the air conditioner. And a second detection means for calculating the cold / hot water load of the cold / hot water, wherein the indoor load is calculated based on a measurement value of the first detection means. , Calculating the cold / hot water load, the first power consumption of the cold / hot water pump, and the second power consumption of the air conditioner based on the measured value of the second detection means; System COP based on power consumption and indoor load The flow of the cold / hot water is changed, the flow of the cold / hot water is selected, and the flow of the cold / hot water that is maximum is selected from among the system COPs. It is characterized by controlling the water pump.

  In this case, the maximum cold / hot water flow rate in the system COP is selected in advance by measuring the first and second detection means, the indoor load, the cold / hot water load, and the system COP being maximum. From the database indicating the relative relationship between the cold / hot water flow rate or the frequency setting value of the inverter, according to the measured value detected by the second detecting means and the measured value detected by the first detecting means Good.

  In this case, the database includes the geothermal temperature, the indoor load, the heat exchanger cold / hot water inlet temperature, the cold / hot water flow rate that minimizes the energy consumption of the entire system, or the frequency setting value of the inverter. It may be a control table indicating a relative relationship.

It is possible to reduce the total power consumption of the cold / hot water pump and the air conditioner in an air conditioning system having an air conditioner using a heat pump that uses geothermal heat as a heat source. Accordingly, it is possible to efficiently operate the air conditioning equipment and suppress the emission of carbon dioxide.
Moreover, the conveyance power of the cold / hot water pump which occupies the whole system can be reduced effectively, and the power consumption of the whole system can be reduced.

It is a figure showing the composition outline of the air-conditioning system of this embodiment. It is the flowchart which showed the calculation procedure of the optimal value of the inverter frequency of a cold / hot water pump. It is a conceptual diagram of the relationship between cold / hot water flow volume and the power consumption of a system. It is explanatory drawing of the control means which controls an air conditioning system based on the optimal value acquired from table data. It is explanatory drawing of the control table which shows the combination of the inverter frequency from which the system COP corresponding to indoor load, underground heat exchanger inlet temperature T3, and underground heat temperature T5 becomes the maximum. It is the graph which showed the relationship between the calculated value of power consumption W1, W2, and an actual measurement value.

  Embodiments of an air conditioning system and a control method thereof according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing a schematic configuration of the air conditioning system of the present embodiment. The air conditioning system 10 of this embodiment includes an air conditioner 20, a ground heat exchanger 30, a cold / hot water pipe 40 connecting the air conditioner 20 and the underground heat exchanger 30, a cold / hot water pump 50, and an inverter 52. The control means 60 is the main basic configuration. This embodiment demonstrates the operating method of the air conditioning system 10 using the heat pump which uses geothermal heat as a heat source. Throughout the year, the underground heat exchanger 30 is installed in the ground where the temperature is constant, the cold / hot water for the air conditioner 20 is circulated to the underground heat exchanger 30 to exchange heat with the underground, It is cooled when using air conditioning in summer and heated when using heating in winter.

  The air conditioner 20 is a heat pump type air conditioner including a heat pump and an air conditioning unit (not shown) in a casing. The heat pump is connected to a below-described underground heat exchanger to extract and dissipate heat. The air conditioning unit is an air conditioning facility that cools or heats the room.

  The air conditioner 20 includes first detection means necessary for calculating the indoor load. Specifically, the first detection means has a basic configuration of first and second temperature sensors 70 and 72, first and second humidity sensors 74 and 76, anemometer 78, and first wattmeter 80.

The first temperature sensor 70 is a sensor that measures the temperature T1 of the air conditioner suction port of the air conditioner 20.
The second temperature sensor 72 is a sensor that measures the temperature T2 of the air conditioner outlet of the air conditioner 20.
The first humidity sensor 74 is a sensor that measures the humidity Rh1 of the air conditioner suction port of the air conditioner 20.
The second humidity sensor 76 is a sensor that measures the humidity Rh <b> 2 of the air conditioner outlet of the air conditioner 20.

The anemometer 78 is a sensor that measures the air speed L of cooling or heating discharged from the air conditioner 20.
The first wattmeter 80 is configured to be able to measure the power consumption W1 of the air conditioner 20.
The first and second temperature sensors 70 and 72, the first and second humidity sensors 74 and 76, the anemometer 78, and the first wattmeter 80 are configured to send measured values to the control means 60 described later. Yes.
The underground heat exchanger 30 is configured by inserting U tubes (piping) into a plurality of piles or boreholes (holes) embedded in the ground.

A cold / hot water pipe 40 is formed between the underground heat exchanger 30 and the air conditioner 20.
The cold / hot water pipe 40 includes a feed pipe 42 and a return pipe 44. With this configuration, the cold / hot water that has passed through the air conditioner 20 passes through the return pipe 44 of the cold / hot water pipe 40, passes through the U tube, is heat-exchanged by the underground heat exchanger 30, and is again supplied from the feed pipe 42 to the air conditioner 20. Return to.

  A cold / hot water pump 50 is mounted on the feed pipe 42 of the cold / hot water pipe 40. In the feed pipe 42 of the cold / hot water pump 50, cold / hot water is supplied from the underground heat exchanger 30 to the air conditioner 20. In the return pipe 44, cold / hot water is supplied from the air conditioner 20 to the underground heat exchanger 30.

An inverter 52 is connected to the cold / hot water pump 50, and the flow rate of the cold / hot water can be changed by changing the frequency of the inverter 52 to change the rotation speed of the pump.
The air conditioning system 10 includes second detection means for calculating the load of cold / hot water. The second detection means mainly includes the third to fifth temperature sensors 82, 84, 85, the flow meter 86, and the second wattmeter 54.

The third and fourth temperature sensors 82 and 84 and the flow meter 86 are mounted on the cold / hot water pipe 40.
The third temperature sensor 82 is a sensor that measures the inlet temperature T3 on the cold / hot water inlet side of the underground heat exchanger 30.
The fourth temperature sensor 84 is a sensor that measures the outlet temperature T4 on the cold / hot water outlet side of the underground heat exchanger 30.
The fifth temperature sensor 85 is a sensor that measures the underground heat temperature T5 of the buried underground heat exchanger 30.

The flow meter 86 measures the flow of cold / hot water on the feed pipe 42.
The power consumption of the cold / hot water pump 50 is measured by a second wattmeter 54 that is electrically connected to the inverter 52.
The third to fifth temperature sensors 82, 84, 85, the flow meter 86 and the second wattmeter 54 are configured to send measured values to the control means 60 described later.

The control means 60 is electrically connected to the inverter 52, and includes a simulator 62 for obtaining an optimum value of the inverter frequency of the cold / hot water pump 50 and a controller 64 for outputting the optimum value of the inverter frequency obtained by the cold / hot water pump 50. Main basic configuration.
The simulator 62 simulates control by the control means 60 and calculates the power consumption of the entire air conditioning system.

  Measurement values of various sensors on the system necessary for obtaining the optimum value are input to the control means 60. Specifically, it was measured by the first and second temperature sensors 70 and 72 and the first and second humidity sensors 74 and 76, the anemometer 78, and the first wattmeter 80 connected to the air conditioner 20. The measured values of the temperature T1, T2, humidity, wind speed L, and power consumption W1 of the intake air and the discharge air of the air conditioner are input.

  Moreover, the cold / hot water inlet temperature and cold / hot water outlet temperature T3, T4 of the underground heat exchanger 30 measured by the 3rd-5th temperature sensors 82, 84, 85, and the flow meter 86, underground heat temperature T5, cold / hot water The measured values of the cold / hot water flow rate LL of the pipe and the power consumption W2 of the cold / hot water pump 50 are input.

  Based on these input measurement values, the simulator 62 of the control means 60 obtains the optimum value of the inverter frequency of the cold / hot water pump 50. The controller 64 controls the inverter frequency of the pump by outputting the optimum value of the inverter frequency to the cold / hot water pump 50.

The air conditioning system and control method of the present embodiment having the above configuration will be described below.
FIG. 2 is a flowchart showing a procedure for calculating the optimum value of the inverter frequency of the cold / hot water pump.
The first and second temperature sensors 70 and 72, the first and second humidity sensors 74 and 76, and the anemometer 78 that constitute the first detection means are used to air conditioner suction temperature T1, air conditioner discharge temperature T2, air conditioning The machine suction humidity Rh1, the discharge humidity Rh2 of the air conditioner, and the wind speed L are measured. The third and fifth temperature sensors 82, 84, 85 and the flow meter 86 constituting the second detection means allow the cold / hot water inlet temperature and the cold / hot water outlet temperature T 3, T 4 of the underground heat exchanger 30 to be underground. The hot temperature T5 and the cold / hot water flow rate LL are measured. These measured values are input to the control means 60. (Step 100).

  Of the input measured values, the simulator 62 of the control means 60 uses the measured values of the air conditioner suction temperature T1, the air conditioner discharge temperature T2, the air conditioner suction port humidity Rh1, the air conditioner discharge humidity Rh2, and the wind speed L. The indoor load QQ applied to the air conditioner 20 is calculated (step 120).

The indoor load QQ is calculated by Equation 1.

  The indoor load QQ is processed by cold air or hot air during air-conditioner cooling operation. This cold air or warm air is produced by consuming electric power in the air conditioner. During the cooling operation, the amount of heat corresponding to the electric power consumed in the air conditioner and the amount of heat corresponding to the indoor load QQ are discharged from the air conditioner to the cold / hot water. During the heating operation, the amount of heat excluding the amount of heat corresponding to the power consumed in the air conditioner from the indoor load QQ is collected from the cold / hot water. The amount of heat discharged into the cold / hot water or collected from the cold / hot water becomes the cold / hot water load Q applied to the underground heat exchanger 30.

Next, the cold / hot water load Q concerning the underground heat exchanger 30 is calculated (step 130). The cold / hot water load Q is calculated according to Equation 2.

Next, the cold / hot water flow rate LL which can process the calculated cold / hot water load Q, and the underground heat exchanger exit temperature T4 in the cold / hot water flow rate LL are calculated using the simulator 62 (step 140).
The COP, power consumption W1, and cold / hot water power consumption W2 of the heat pump air conditioner 20 are calculated from the calculated cold / hot water flow rate LL and the underground heat exchanger outlet temperature T4.

  A method for calculating the power consumption W1 of the heat pump air conditioner 20 will be described (step 160). W1 is calculated by first calculating the cold / hot water outlet temperature T4 of the underground heat exchanger 30 by the simulator 62, and using the temperature (T4) and the cold / hot water flow rate (LL), the known performance of the heat pump air conditioner itself is calculated. It can be calculated from the curve.

  A method of calculating the power consumption W2 of the cold / hot water pump 50 will be described (step 180). The calculation of W2 is obtained by operating the cold / hot water pump while changing the flow rate by experiment and measuring the inverter frequency and power consumption corresponding to each flow rate to obtain an approximate curve of the flow rate and inverter frequency, flow rate and power consumption. It is done. Thereby, the power consumption W2 of the cold / hot water pump corresponding to each flow rate is calculated.

ここで冷温水流量と消費電力の関係について説明する。図３は冷温水流量とシステムの消費電力の関係の概念図である。同図横軸は冷温水流量を示し、縦軸は消費電力を示している。図示のように冷温水流量が増加すると、空調機２０の消費電力は低下する。このとき冷温水ポンプ５０は冷温水を多く送るため冷温水ポンプ５０の消費電力は上昇する。そして空調機２０と冷温水ポンプ５０の消費電力の合計値は冷温水流量Ｖ０のとき消費電力が最小となる。 Next, a system COP that is a performance index of the entire system is calculated from the indoor load QQ, the power consumption W1 of the air conditioner 20, and the power consumption W2 of the cold / hot water pump 50.
The system COP is calculated by Equation 3.

Here, the relationship between the cold / hot water flow rate and the power consumption will be described. FIG. 3 is a conceptual diagram of the relationship between the cold / hot water flow rate and the power consumption of the system. The horizontal axis of the same figure shows the cold / hot water flow rate, and the vertical axis shows the power consumption. As illustrated, when the cold / hot water flow rate increases, the power consumption of the air conditioner 20 decreases. At this time, since the cold / hot water pump 50 sends a lot of cold / hot water, the power consumption of the cold / hot water pump 50 increases. The total power consumption of the air conditioner 20 and the cold / hot water pump 50 is the minimum when the cold / hot water flow rate V0.

  As shown in Formula 3, regarding the relationship between the system COP and the total power consumption, the system COP increases as the total power consumption decreases. Therefore, if the flow rate of the chilled / hot water pump 50 is controlled so that the chilled / hot water flow rate V0 is the minimum value of the total power consumption, the total power consumption of the entire air conditioning system 10 can be minimized and set to an optimum value.

  A plurality of combinations of the chilled / hot water flow rate LL that can handle the chilled / hot water load Q and the underground heat exchanger outlet temperature T4 are considered. These combinations, that is, the cold / hot water flow rate LL is changed and one type (combination of the cold / hot water flow rate LL and the underground heat exchanger outlet temperature T4) is calculated using the simulator 62, and each type of system COP is calculated ( Step 200).

A cold / hot water flow rate LL that maximizes the system COP is selected from the calculation results (step 220).
The selected cold / hot water flow rate LL is converted into the inverter frequency of the cold / hot water pump 50 (step 240). Frequency conversion can be obtained by operating the chilled / hot water pump while changing the flow rate and measuring the inverter frequency corresponding to each flow rate in advance to obtain an approximate curve of the flow rate and the inverter frequency and using this approximate curve. it can.

The inverter frequency at which the system COP is maximized is output from the controller 64 to the inverter 52 of the cold / hot water pump 50 (step 260).
As described above, the example of controlling the air conditioning system based on the optimum value obtained from the calculation result of the simulation has been described. However, optimum values under various environmental conditions are stored in advance as table data and obtained from this table. The air conditioning system can be controlled based on the optimum value.

  FIG. 4 is a diagram illustrating a configuration example of a control unit that controls the air conditioning system based on the optimum value acquired from the table data. As illustrated, the control means 60 </ b> A includes a simulator 62, a controller 64, and a storage unit 66.

  Specifically, the simulator 62 preliminarily measures the measured values of the first and second detection means, the indoor load QQ, the cold / hot water load Q, and the cold / hot water flow rate LL at which the system COP is maximized as a result of the same simulation as described above. A storage unit 66 that stores a database indicating the relative relationship between the frequency setting values of the inverter is provided. The storage unit 66 stores the measured value detected by the second detecting unit and the measured value detected by the first detecting unit. The frequency setting value can be extracted.

  As an example of the database, a simulation method for calculating the chilled / hot water flow rate LL at which the system COP is maximized and the inverter frequency of the chilled / hot water pump 50, the inverter frequency at which the system COP is maximized, the chilled / hot water load Q, and the underground heat There is a method of using a control table in which a combination of the exchanger inlet temperature T3 and the underground heat temperature T5 is calculated and tabulated.

  FIG. 5 is an explanatory diagram of a control table showing combinations of the inverter frequency of the cold / hot water pump at which the system COP is maximized, the indoor load QQ, the underground heat exchanger inlet temperature T3, and the underground heat temperature T5.

  Cold / hot water flow rate LL or cold / hot water pump inverter frequency that can handle indoor load QQ and cold / hot water load Q by simulator 62, underground heat exchanger inlet temperature T3, underground heat exchanger outlet temperature T4, underground heat temperature The combinations of T5 are calculated in advance, tabulated, and stored in the storage unit 66. Using the Q, T3, T4, and T5 as input values, the inverter frequency at which the system COP is maximized is referred from the control table.

By using such a database, the calculation load of the control means 60 can be reduced and the processing time can be shortened.
Moreover, although the form of the heat pump type air conditioner 20 assumes the package air conditioner, another form, for example, the heat pump type chiller which manufactures cold / hot water, may be sufficient.

  When a heat pump chiller is used for the heat pump air conditioner 20, T3 measured by the third temperature sensor 82 is the inlet temperature of cold / hot water produced by the heat pump chiller, and T4 measured by the fourth temperature sensor 84 is It becomes the exit temperature of the cold / hot water manufactured with the heat pump chiller, and the air volume L of the air conditioner 20 becomes the flow rate of the cold / hot water manufactured with the heat pump chiller.

ここでＬＬＬは冷温水（負荷側）流量、Ｃｗは冷温水比熱、ρｗは冷温水比重を示している。 When the heat pump chiller is used, the thermal load QQ applied to the heat pump chiller is calculated by Equation 4.

Here, LLL is the cold / hot water (load side) flow rate, Cw is the cold / hot water specific heat, and ρw is the cold / hot water specific gravity.

  As described above, in the flowchart shown in FIG. 2, the method has been described in which the simulator 62 calculates and calculates the power consumption W1 of the air conditioner using the heat pump and the power consumption W2 of the cold / hot water pump. Here, when a deviation occurs between the calculated values of the power consumption W1 and W2 and the actual measurement values due to factors such as aging deterioration of the apparatus, it is considered that the accuracy of the simulation is deteriorated and the optimum operation becomes difficult.

  Therefore, in order to avoid this problem, it is necessary to correct the calculated values by comparing the calculated values of the power consumption W1 and W2 by the simulator 62 with the measured values measured by the first and second wattmeters 80 and 54. is there.

  FIG. 6 is a graph showing the relationship between the calculated values of the power consumption W1 and W2 and the measured values. In the figure, the horizontal axis indicates the total value of the power consumption W1 and W2 calculated by the simulator 62, and the vertical axis indicates the actual measurement values (measurements) of the first and second wattmeters 80 and 54 corresponding to the calculated values (calculated values). Value) is plotted. These calculated values and measured values are stored in the storage unit 66 in advance, and a relational expression y = aX + bY (a and b are coefficients) between the calculated values and the measured values shown in FIG. What is necessary is just to correct | amend by the relational expression of a calculated value and a measured value at the time of the calculation in the simulator 62. FIG. Specifically, in the flowchart shown in FIG. 2, a relational expression y = aX + bY (a and b are coefficients) between the calculated value and the measured value is obtained in advance by the least square method before step 100. And the process of step 100 to step 180 is performed similarly. Next, after calculating the power consumption W2 in step 180, a step of correcting the calculated values of the power consumption W1 and W2 by a relational expression stored in advance in the storage unit 66 may be added. Thereafter, the processes after Step 200 are similarly performed. By performing this process, the power consumption W1 and W2 calculated by the simulator 62 can be brought close to the actually measured values, and the simulation accuracy can be improved.

  Further, by using the relational expression between the calculated values and the measured values of the power consumption W1 and W2, the table data shown in FIG. 5 is corrected and stored in the storage unit 66. If the data table is updated as needed, the simulation can be maintained with high accuracy. can do.

  According to such an air conditioning system and control method of this embodiment, it is possible to reduce the total power consumption of the cold / hot water pump and the air conditioner in the air conditioning system having an air conditioner using a heat pump using geothermal heat as a heat source. it can. Therefore, efficient operation of the air conditioning equipment is possible.

10 ......... Air conditioning system, 20 ......... Air conditioner, 30 ......... Ground heat exchanger, 40 ......... Cold and hot water piping, 42 ......... Feed piping, 44 ......... Return piping, 50 ......... Cold / hot water pump, 52 ......... Inverter, 54 ......... Second power meter, 60, 60A ......... Control means, 62 ......... Simulator, 64 ...... Controller, 66 ......... Storage unit, 70 ... ...... First temperature sensor 72 ......... Second temperature sensor 74 ......... First humidity sensor 76 ......... Second humidity sensor 78 ......... Anemometer 80 ......... First 1 wattmeter, 82 ... third temperature sensor, 84 ... fourth temperature sensor, 85 ... fifth temperature sensor, 86 ... ... flow meter.

Claims (6)

A heat exchanger using underground heat,
A cold / hot water pump for circulating cold / hot water in the heat exchanger;
An inverter for changing the rotation speed of the cold / hot water pump;
An air conditioner for cooling or heating through the cold / hot water circulating through the heat exchanger;
First detecting means for calculating an indoor load of the air conditioner;
Second detection means for calculating a cold / hot water load of the cold / hot water circulating between the heat exchanger and the air conditioner;
The indoor load is calculated based on the measurement value of the first detection means, the cold / hot water load, the first power consumption of the cold / hot water pump based on the measurement value of the second detection means, Of the system COP calculated by calculating the second power consumption of the air conditioner, calculating the system COP based on the first and second power consumption and the indoor load, and changing the flow rate of the cold / hot water A simulator that performs simulation to select the maximum cold / hot water flow rate in
A controller for controlling the cold / hot water pump with a frequency setting value of the inverter of the cold / hot water flow rate at which the system COP is maximized;
An air conditioning system characterized by comprising   The simulator has a relative relationship between the measured values of the first and second detection means, the indoor load, the cold / hot water load, and the cold / hot water flow rate at which the system COP is maximized or the frequency setting value of the inverter. A frequency setting value of the inverter is extracted from the database according to the measured value detected by the second detecting means and the measured value detected by the first detecting means. The air conditioning system according to claim 1.   The database includes the relative relationship between the underground heat temperature, the indoor load, the heat exchanger cold / hot water inlet temperature, the cold / hot water flow rate at which the energy consumption of the entire system is minimized, or the frequency setting value of the inverter. The air conditioning system according to claim 2, wherein the air conditioning system is a control table. A heat exchanger that uses geothermal heat, a cold / hot water pump that circulates cold / hot water in the heat exchanger, an inverter that changes the rotation speed of the cold / hot water pump, and the cold / hot water that circulates through the heat exchanger. An air conditioner that is cooled or heated via, a first detection means for calculating an indoor load of the air conditioner, and a cold / hot water load of the cold / hot water circulating between the heat exchanger and the air conditioner A second detection means for controlling the air conditioning system,
Calculating the indoor load based on the measurement value of the first detection means;
Calculating the cold / hot water load, the first power consumption of the cold / hot water pump, and the second power consumption of the air conditioner based on the measured value of the second detection means;
Calculating a system COP based on the first and second power consumption and the indoor load;
Select the maximum cold / hot water flow rate among the system COPs calculated by changing the flow rate of the cold / hot water,
A control method for an air conditioning system, wherein the cold / hot water pump is controlled by a frequency setting value of the inverter of the cold / hot water flow rate at which the system COP is maximized.   In the system COP, the maximum cold / hot water flow rate is selected in advance by measuring the first and second detection means, the indoor load, the cold / hot water load, and the cold / hot water temperature at which the system COP is maximum. Extracting from the database showing the relative relationship between the water flow rate or the frequency setting value of the inverter according to the measured value detected by the second detecting means and the measured value detected by the first detecting means The method of controlling an air conditioning system according to claim 4.   The database includes the relative relationship between the underground heat temperature, the indoor load, the heat exchanger cold / hot water inlet temperature, the cold / hot water flow rate at which the energy consumption of the entire system is minimized, or the frequency setting value of the inverter. 6. The air conditioning system control method according to claim 5, wherein the control table is a control table.

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