JP2018204809A - Air-conditioning control device and method - Google Patents

Abstract

To enable accurate air-conditioning control regardless of situation of outside air.SOLUTION: A production heat quantity calculation unit 101 is configured to calculate each heat quantity a heat source machine A111a, a heat source machine B111b and a heat source machine C111c produce. A load calculation unit 102 is configured to calculate each load factor of the heat source machine A111a, heat source machine B111b and heat source machine C111c at the time when the production heat quantity calculation unit 101 calculates the heat quantity. A maximum capacity calculation unit 103 is configured to calculate a value obtained by dividing the calculated heat quantity by the calculated load factor as a maximum capacity of the heat source machine A111a, heat source machine B111b and heat source machine C111c.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning control device and method, and more particularly to an air conditioning control device and method for controlling air conditioning by controlling the number of heat source units.

  In heat source devices used for air conditioning control, etc., the heat source machine design capacity (maximum capacity), design flow rate (design value of pump heat medium flow rate when maximum capacity is exhibited), heat medium pump transfer capacity (rated flow rate), etc. It is determined in consideration of the required maximum heat load.

  In general, the capacity of a heat source machine varies greatly depending on the outlet temperature of cold / hot water of the heat source machine. Among the heat source machines, the capacity of air-cooled heat source machines varies depending on the outside air temperature, and the capacity of water-cooled heat source machines varies depending on the cooling water temperature. For example, when the first heat source machine has a capacity of 60% of the maximum capacity, the stage can be increased to the second heat source machine even though the cooling capacity of 40% is still available. There is. To increase the number of stages of the heat source unit while leaving the surplus power, the heat source unit and the heat medium pump including the cooling water pump and the cooling tower fan are started up early, resulting in excessive consumption of energy. In addition, the second heat source machine is often set to have a lower efficiency than the first heat source machine, and this is one of the causes of excessive energy consumption.

  As a method of setting the capacity of the heat source machine, for example, from the technology that uses the rated capacity as a fixed value throughout the year, or from the outside air temperature or cooling water temperature and the capacity table according to the outlet temperature of the cold / hot water of each heat source machine, There are techniques to determine the ability of According to the method for determining the capability from the capability table, relatively fine operation control is possible.

JP 2004-184052 A

  However, in the technology that uses the rated capacity as a set value throughout the year, the maximum capacity of the heat source unit fluctuates due to outside air conditions, etc., so there is a discrepancy from the rated capacity value, and accurate capacity setting cannot be performed. . For this reason, when the outside air conditions are not severe, such as an intermediate period, the number of heat source units may be increased even if the capacity of the heat source units is sufficient. According to such a technique, originally unnecessary heat source machines are increased, which causes a problem in terms of energy saving. In addition, the technology using the capability table has a problem that the capability of the heat source device cannot be accurately grasped due to problems such as the accuracy of the capability table and the secular change of the heat source device.

  The present invention has been made to solve the above-described problems, and provides a method for controlling the number of heat source units capable of exerting the maximum capacity of the heat source unit regardless of the conditions of the outside air. This is one of the purposes.

  The air-conditioning control device according to the present invention calculates a production heat amount calculation unit configured to obtain the amount of heat produced by the heat source unit, and calculates a load factor of the heat source unit at the time when the production heat amount calculation unit obtains the heat amount. The load calculation unit configured in the above, the maximum capacity calculation unit configured to calculate the value obtained by dividing the amount of heat by the load factor as the maximum capacity of the heat source unit, and the number of operating heat source units is determined based on the maximum capacity An operation number determining unit configured as described above.

  In the air conditioning control device, the load calculation unit may calculate the load factor based on the operating frequency of the motor that drives the compressor of the heat source device. The load calculation unit may calculate the load factor based on the power consumption of the motor that drives the compressor of the heat source device.

  In the air conditioning control device, the production heat quantity calculation unit may calculate a value obtained by multiplying the difference between the cold / hot water outlet temperature of the heat source machine and the cold / hot water outlet temperature of the heat source machine by the flow rate of the cold / hot water as the heat quantity. .

  In the air conditioning control method according to the present invention, the first step for determining the amount of heat produced by the heat source unit, the second step for calculating the load factor of the heat source unit at the time of determining the amount of heat, and the amount of heat divided by the load factor. A third step of calculating the value as the maximum capacity of the heat source unit and a fourth step of determining the number of operating heat source units based on the maximum capacity.

  In the air conditioning control method, in the second step, the load factor may be calculated based on the operating frequency of the motor that drives the compressor of the heat source device. In addition, you may calculate a load factor based on the power consumption of the motor which drives the compressor of a heat source machine.

  In the air conditioning control method, in the first step, a value obtained by multiplying the difference between the temperature of the cold / hot water of the heat source device and the temperature of the cold / warm water of the heat source device by the flow rate of the cold / warm water may be calculated as the amount of heat.

  As described above, according to the present invention, it is possible to obtain an excellent effect that the maximum capacity of the heat source device can be exhibited and the operation of the minimum number of units can be lengthened regardless of the conditions of the outside air.

FIG. 1 is a configuration diagram showing a configuration of an air conditioning control device according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating an air conditioning control method according to the embodiment of the present invention. FIG. 3 is a block diagram showing a hardware configuration of the air conditioning control device according to the present invention. FIG. 4 is a configuration diagram showing another configuration of the air-conditioning control apparatus in the embodiment of the present invention. FIG. 5 is a configuration diagram showing another configuration of the air-conditioning control apparatus according to the embodiment of the present invention. FIG. 6 is a characteristic diagram showing the relationship between power consumption and load factor in the heat source device.

  Hereinafter, an air-conditioning control apparatus according to an embodiment of the present invention will be described with reference to FIG. The air conditioning control device includes a manufacturing heat quantity calculation unit 101, a load calculation unit 102, a maximum capacity calculation unit 103, and an operating number determination unit 104. As is well known, this air conditioning control device controls the cold / hot water supplied to the external load 113 by increasing or decreasing the number of operating heat source devices A111a, B111b, and C111c. Cold / hot water generated from the heat source machine A 111 a, the heat source machine B 111 b, and the heat source machine C 111 c is supplied to the external load 113 via the forward header 112. Moreover, the cold / hot water used for the air conditioning by the external load 113 returns to the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c via the return header 114.

The production heat quantity calculation unit 101 obtains the quantity of heat produced by the heat source machine A111a, the heat source machine B111b, and the heat source machine C111c, respectively. For example, the production heat quantity calculation unit 101 calculates the difference between the inlet temperature of the cold / hot water of the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c and the outlet temperature of the cold / hot water of the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c. A value obtained by multiplying the flow rate of the cold / hot water is calculated as the heat quantity Q ₀ .

  The inlet temperature of the cold / hot water of the heat source device A111a is measured by the thermometer 115a. Moreover, the inlet temperature of the cold / hot water of heat-source equipment B111b is measured by the thermometer 115b. The inlet temperature of the cold / hot water of the heat source device C111c is measured by the thermometer 115c.

  The temperature of the cold / warm water going out (generated) from the heat source device A111a is measured by the thermometer 116a. Moreover, the exit temperature of the cold / hot water of the heat source device B111b is measured by the thermometer 116b. Moreover, the exit temperature of the cold / hot water of the heat source device C111c is measured by the thermometer 116c.

  The flow rate of the cold / hot water in the heat source machine A111a is measured by a flow meter 117a provided at a location where the cold / hot water goes out. Further, the flow rate of the cold / hot water in the heat source device B111b is measured by a flow meter 117b provided at a location where the cold / warm water goes out. Further, the flow rate of the cold / hot water in the heat source device C111c is measured by a flow meter 117c provided at a location where the cold / warm water goes out. In addition, you may use the measured value of the flowmeter in the orifice provided in the flow path inside each heat source machine for the flow volume of cold / hot water. Moreover, you may measure the flow volume of cold / hot water with the flowmeter provided in the location where cold / hot water returns.

The load calculation unit 102 calculates the load factors of the heat source unit A 111a, the heat source unit B 111b, and the heat source unit C 111c at the time when the production heat amount calculation unit 101 obtains the heat amount. For example, the load calculation unit 102 calculates the load factor based on the operating frequency of the motor that drives the compressors of the heat source device A 111a, the heat source device B 111b, and the heat source device C 111c. The load factor L is calculated by dividing the operation frequency f ₀ at the time when the amount of heat is obtained by “the load factor L = f ₀ / f _max ” by the maximum frequency f _max in the motor driving the compressor in each heat source device. be able to.

The maximum capacity calculation unit 103 calculates a value “Q _max = Q ₀ / L” obtained by dividing the obtained heat quantity Q ₀ by the load factor L as the maximum capacity of the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c. As described above, the present invention is characterized in that the maximum capacity of the heat source unit at the time of control is obtained. Based on the maximum capacity of each heat source machine obtained in this way, the number of operating units determination unit 104 determines the number of operating heat source machines A111a, B111b, and C111c.

  Next, operation | movement (air-conditioning control method) of the air-conditioning control apparatus in embodiment is demonstrated using FIG. First, in step S101, the production heat quantity calculation unit 101 obtains the heat quantities produced by the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c, respectively. As described above, the flow rate of cold / hot water is the difference between the inlet temperature of the cold / hot water of the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c and the outlet temperature of the cold / hot water of the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c. The value multiplied by is calculated as the amount of heat.

  Next, in step S102, the load calculation unit 102 calculates the load factors of the heat source device A 111a, the heat source device B 111b, and the heat source device C 111c at the time when the amount of heat is obtained. As described above, the load factor is calculated based on the operating frequency of the motor that drives the compressor of the heat source device A111a, the heat source device B111b, and the heat source device C111c. In addition, you may calculate a load factor based on the power consumption of the motor which drives the compressor of each heat source machine.

  Next, in step S103, the maximum capacity calculation unit 103 calculates a value obtained by dividing each calculated amount of heat by the calculated load factor as the maximum capacity of the heat source apparatus A111a, the heat source apparatus B111b, and the heat source apparatus C111c. Next, in step S104, the operating number determination unit 104 determines the operating number of the heat source unit A111a, the heat source unit B111b, and the heat source unit C111c based on the maximum capacities obtained.

  The air conditioning control device in the above-described embodiment includes a CPU (Central Processing Unit) 201, a main storage device 202, an external storage device 203, a network connection device 204, and the like, as shown in FIG. Each of the functions described above is realized by the CPU operating by a program developed in the main storage device. The network connection device 204 is connected to the network 205. Each function may be distributed among a plurality of computer devices.

  By the way, you may make it obtain | require a load factor from the power consumption of the said motor.

  For example, when the heat source device is an air-cooled heat source device, as shown in FIG. 4, the maximum power consumption of the motor at each of a plurality of outside air temperatures, a plurality of cold water outlet temperatures, and a plurality of cold water inlet / outlet temperature differences is obtained in advance. And stored in the storage unit 105.

  In this case, the load calculation unit 102 first determines the outside air temperature measured by the outside air temperature measurement unit 106, the outlet temperature measured by the thermometer 116a, the thermometer 116b, and the thermometer 116c, the thermometer 115a, and the temperature. 115b, thermometer 115c, thermometer 116a, thermometer 116b, maximum temperature of motor in heat source apparatus A111a, heat source apparatus B111b, and heat source apparatus C111c at the time when the amount of heat is obtained by the temperature difference between the entrance and exit measured by thermometer 116c. Obtain power consumption. The load calculation unit 102 divides the maximum power consumption obtained as described above by the actual power consumption of the motor at the time of obtaining the amount of heat in the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c. Calculate the load factor. Using the load factor thus determined, the maximum capacity calculation unit 103 calculates the maximum capacity of the heat source device A 111a, the heat source device B 111b, and the heat source device C 111c.

  When the heat source device is a water-cooled heat source device, as shown in FIG. 5, the maximum power consumption of the motor at each of a plurality of cooling water temperatures, a plurality of cooling water outlet temperatures, and a plurality of cooling water inlet / outlet temperature differences is previously determined. Obtained and stored in the storage unit 105.

  In this case, the load calculation unit 102 first determines the cooling water temperature measured by the cooling water temperature measurement unit 107, the outlet temperature measured by the thermometer 116a, the thermometer 116b, and the thermometer 116c, and the thermometer 115a. , Thermometer 115b, thermometer 115c, thermometer 116a, thermometer 116b, motors in heat source apparatus A111a, heat source apparatus B111b, and heat source apparatus C111c at the time when the amount of heat is obtained by the temperature difference between the entrance and exit measured by thermometer 116c Find the maximum power consumption. The load calculation unit 102 divides the maximum power consumption obtained as described above by the actual power consumption of the motor at the time of obtaining the amount of heat in the heat source machine A 111a, the heat source machine B 111b, and the heat source machine C 111c. Calculate the load factor. Using the load factor thus determined, the maximum capacity calculation unit 103 calculates the maximum capacity of the heat source device A 111a, the heat source device B 111b, and the heat source device C 111c.

  By the way, in practice, the relationship between the power consumption and the load factor in the heat source device may not be a linear relationship particularly in a low-medium load region as shown by a solid line in FIG. For this reason, when the load factor is estimated from the power consumption as described above, a more accurate relationship can be obtained by correcting the state shown in FIG.

  As explained above, the load factor of the heat source machine at the time of obtaining the heat quantity of the heat source machine is obtained, the value obtained by dividing the heat quantity by the load factor is the maximum capacity of the heat source machine, and the number of operating heat source machines is determined. As a result, air conditioning control can be performed more accurately regardless of outside air conditions. In the present invention, since the maximum capacity of the heat source machine at the time of control is calculated, even if the performance of the heat source machine has changed due to outside air conditions, deterioration of the heat source machine, etc. It is possible to control the number of heat source units.

  The present invention is not limited to the embodiment described above, and many modifications and combinations can be implemented by those having ordinary knowledge in the art within the technical idea of the present invention. It is obvious. For example, in the above description, the control of the number of three heat source units has been described as an example, but the present invention is not limited to this, and the same applies to the case of two units or four or more units.

  DESCRIPTION OF SYMBOLS 101 ... Manufacturing heat quantity calculation part, 102 ... Load calculation part, 103 ... Maximum capacity calculation part, 104 ... Operation number determination part, 111a ... Heat source machine A, 111b ... Heat source machine B, 111c ... Heat source machine C, 113 ... External load, 114 ... Return header, 115a, 115b, 115c ... Thermometer, 116a, 116b, 116c ... Thermometer, 117a, 117b, 117c ... Flow meter.

Claims (8)

A calorific value calculation unit configured to determine the amount of heat produced by the heat source device; and
A load calculation unit configured to calculate a load factor of the heat source machine at the time when the production heat amount calculation unit obtains the heat amount; and
A maximum capacity calculator configured to calculate a value obtained by dividing the amount of heat by the load factor as the maximum capacity of the heat source unit;
An air-conditioning control apparatus comprising: an operating unit number determining unit configured to determine the operating unit number of the heat source units based on the maximum capacity. In the air-conditioning control device according to claim 1,
The load calculating unit calculates the load factor based on an operating frequency of a motor that drives a compressor of the heat source unit. In the air-conditioning control device according to claim 1,
The load calculation unit calculates the load factor based on power consumption of a motor that drives a compressor of the heat source unit. In the air-conditioning control device according to any one of claims 1 to 3,
The production heat quantity calculation unit calculates, as the heat quantity, a value obtained by multiplying a difference between an inlet temperature of the cold / hot water of the heat source machine and an outlet temperature of the cold / hot water of the heat source machine by a flow rate of the cold / hot water. Air conditioning control device. A first step for determining the amount of heat produced by the heat source device;
A second step of calculating a load factor of the heat source machine at the time of obtaining the heat quantity;
A third step of calculating a value obtained by dividing the amount of heat by the load factor as the maximum capacity of the heat source unit;
And a fourth step of determining the number of operating heat source units based on the maximum capacity. In the air-conditioning control method according to claim 5,
In the second step, the load factor is calculated based on an operating frequency of a motor that drives a compressor of the heat source unit. In the air-conditioning control method according to claim 5,
In the second step, the load factor is calculated based on power consumption of a motor that drives a compressor of the heat source unit. In the air-conditioning control method according to any one of claims 5 to 7,
In the first step, a value obtained by multiplying a difference between an inlet temperature of the cold / hot water of the heat source machine and an outlet temperature of the cold / hot water of the heat source machine by the flow rate of the cold / hot water is calculated as the heat quantity. Air conditioning control method.

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