JP2006132918A - Air conditioner and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner which can quickly correspond to a load variation and has improved operation efficiency, and its control method. <P>SOLUTION: Pipes are connected so as to converge cold water fed from a plurality of refrigerators 5 with a cold water pump 3 into a supply primary header 1a, to feed the cold water into a plurality of loads from a supply secondary header 1b, to converge return water from the loads 6 into a return primary header 2a, and to return the return water from the return secondary header 2b into the refrigerators. A balance pipe 7 is connected between a connection pipe line 1c among supply headers and a connection pipe line 2c among return headers. Temperature sensors 11-14 are provided for sensing water temperature at key places. The temperature of the cold water by the refrigerator 5 and the flow rate of the flow by the cold water pump 3 are controlled on the basis of the temperature detected by a control section 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, the heat source water generated by the heat source is supplied to the load via the forward header, the reflux water subjected to heat exchange by the load is returned to the heat source via the ring header, the heat is recovered, and the load is supplied again to the load. The present invention relates to an air conditioner and a control method thereof.

  In order to carry out cooling and heating, the water generated at a predetermined temperature by the heat source is sent to the load, and the reflux water whose temperature has changed by exchanging heat with the air at the load is returned to the heat source to be restored to the predetermined temperature, and is again supplied to the load. An air conditioner is configured by circulating the heat source water.

  As a prior art of such an air conditioner, as shown in FIG. 4, a plurality of refrigerators 109 and a plurality of loads 103 are connected via a forward header 101 and a ring header 105 and supplied from the plurality of refrigerators 109. What is comprised so that the cold water which supplies may be supplied to the some load 103 is known (for example, refer patent document 1).

  In this air conditioner, an air conditioning system in which the primary side is a heat source and the secondary side is a load 103 via the forward header 101 and the return header 105 is arranged between the forward header 101 and the ring header 105. The balance pipe 106 is provided with a flow meter 112 and a bypass pipe 116 provided with a valve 117 between the inlet and outlet of each refrigerator 109 to control the flow rate from each refrigerator 109. 114 and a pump flow rate variable control device 102 for controlling the flow rate of the cold water supplied to the load 103 is provided.

  In this air conditioner, the primary side water amount and the secondary side water amount are controlled by using the numerical value detected by the flow meter 112 as an index, the outside air state, the load state, and the flow rate change in the balance pipe 106 are detected, and the refrigerator 109 The load state and the flow rate after a predetermined time required for starting and stopping the machine are predicted and inferred in advance, and the refrigerator 109 is controlled to start and stop, the valve 117 of the bypass pipe 106 is controlled, and the water supply temperature to the load 103 is We try to prevent sudden changes as much as possible.

  That is, when the load increases, the flow rate to the load increases, so that the bypass flow rate at which the reflux water returns to the water supply side through the bypass pipe increases, and the water supply temperature supplied to the load increases. On the other hand, when the load decreases, the flow rate to the load decreases, so a part of the water sent to the load is mixed with the reflux water through the bypass pipe, the temperature of the reflux water returned to the refrigerator decreases, and the load factor of the refrigerator Decreases.

In order to prevent this, a flow meter is arranged in the balance pipe connecting the forward header and the return header, and the amount of water flowing in the balance pipe is controlled to be zero. In addition, the valve of the bypass pipe is controlled to be opened / closed to prevent the cold water whose water supply temperature has risen when starting or stopping the refrigerator from being sent to the load.
Japanese Patent Laid-Open No. 4-327738 (pages 2 and 3, FIG. 1)

  As described above, in the conventional technique, it is necessary to adjust the flow rate of the bypass pipe in order to prevent the cold water whose water supply temperature has risen from being sent to the load. That is, the complicated configuration such as the provision of a plurality of bypass pipes and the installation of a flow meter make the equipment and construction complicated, and the control operation becomes complicated, increasing the cost of the equipment and construction.

  In addition, since the load factor of the refrigerator is not taken into account, there is a problem that power consumption as an air conditioner increases easily. Here, the load factor of the refrigerator is a percentage of the cooling capacity during the actual operation relative to the rated cooling capacity of the refrigerator.For example, if the refrigerator inlet water temperature rises from the rated standard time, the outlet water temperature Therefore, the cooling capacity (inlet / outlet temperature difference) is reduced and the load factor is also reduced.

  The present invention solves such a conventional problem, and prevents cold water having an increased water supply temperature from being sent to a load by a simple control structure and a highly accurate control method, and provides a secondary side cold water supply temperature. It is an object of the present invention to provide an air conditioner and a control method thereof that can compensate for the above and increase the power consumption ratio by operating a heat source at a high load factor to reduce unnecessary power consumption.

  In order to achieve the above object, the present invention is an air conditioner having a primary side as a heat source and a secondary side as a load via a forward header and a return header, and a heat source sent from a plurality of heat sources by a heat source pump Concentrate the water on the forward header, supply heat source water to each of the multiple loads, condense the reflux water from each load to the return header, connect the piping to return the reflux water to each heat source, A balance pipe is connected between the return header and a heat source water temperature detecting means for detecting the temperature of the heat source water in the forward header is provided, and the temperature of the heat source is controlled based on the temperature detected by the heat source water temperature detecting means. Control means is provided.

  According to the above configuration, by detecting the temperature of the heat source water in the forward header, the load increases and the secondary reflux water flows from the return header to the forward header through the balance pipe (hereinafter referred to as “reverse flow”). And the temperature control of the heat source can be executed by the control means.

  Further, a reflux water primary temperature detecting means for detecting the temperature of the reflux water at the return header inlet, a reflux water secondary temperature detecting means for detecting the temperature of the reflux water at the return header outlet, and a balance for detecting the water temperature in the balance pipe. The temperature detected by the heat source water temperature detection means, the reflux water primary temperature detection means, the reflux water secondary temperature detection means, and the balance pipe water temperature detection means is selected as necessary. Control means for controlling the temperature of the heat source and the flow rate control by the heat source pump based on the measured temperature is provided.

  According to the above configuration, the flow rate balance between the primary side and the secondary side due to load fluctuation is quickly detected by the pipe connection structure and the temperature detection means at the important points, and the control means Temperature control and flow rate control of the heat source can be executed.

  In the above configuration, the heat source pump corresponding to a specific heat source among the plurality of heat sources has a variable flow rate structure, and is controlled by the control means, whereby the control configuration can be configured more simply.

  The forward header is composed of a forward primary header that focuses heat source water sent from a plurality of heat sources by a heat source pump, and a forward and secondary header that supplies heat source water to each of a plurality of loads. It consists of a return primary header that focuses the reflux water from the load and a return secondary header that returns the reflux water to each heat source.

  According to the above configuration, heat source water from a plurality of heat sources can be mixed in the forward header, and reflux water from each load can be mixed in the return header. Can supply running water.

  Also, there is provided a control method for an air conditioner using a primary side as a heat source and a secondary side as a load via a forward header and a return header. The air conditioner sends heat source water sent from a plurality of heat sources by a heat source pump. Concentrate on the header, supply heat source water to each of the multiple loads, condense the reflux water from each load to the return header, connect the piping to return the reflux water to each heat source, and connect the forward header and return header The heat source water temperature in the forward header is detected, and the temperature of the heat source is controlled based on the heat source water temperature.

  According to the above control method, the backflow of the balance pipe can be detected quickly based on the heat source water temperature in the forward header, and the temperature control of the heat source can be executed.

  In addition to the above control method, the primary temperature of the reflux water at the inlet of the return header and the secondary temperature of the reflux water at the outlet of the secondary header are detected, and the primary temperature of the reflux water and the secondary temperature of the reflux water are detected. The flow rate of the heat source pump is controlled based on the temperature difference, and the flow rate of the heat source pump is controlled based on the detection of the water temperature in the balance pipe.

  According to the above control method, the flow rate balance between the primary side and the secondary side due to load fluctuation can be quickly detected, and the temperature control and flow rate control of the heat source can be executed, so the control is simple. Thus, more reliable control can be executed promptly and operation can be performed while maintaining a high load factor of the heat source.

  In the above control method, the temperature of the heat source is controlled so that the temperature of the heat source water in the forward header matches the temperature of the heat source water sent from the heat source, thereby simplifying the control configuration and supplying the load to the load. It is possible to prevent the heat source water temperature from changing.

In addition, by controlling the flow rate of the heat source pump corresponding to a specific heat source based on the temperature difference between the primary temperature of the reflux water and the secondary temperature of the reflux water, the control configuration is simple and the load source can be detected quickly to detect the heat source. By increasing the temperature difference between the inlet and outlet, the load factor of the heat source can be kept high.

  Further, by controlling the flow rate of the heat source pump corresponding to the specific heat source based on the detection of the water temperature in the balance pipe, the load fluctuation can be detected more quickly, and the above-mentioned reflux water primary temperature and reflux water secondary temperature can be detected. Control based on the temperature difference can be interpolated.

  According to the present invention, the heat source water temperature detecting means for detecting the temperature of the heat source water in the forward header is provided, and the control means for controlling the temperature of the heat source based on the temperature detected by the heat source water temperature detecting means is provided. This eliminates the need for a bypass pipe and a flow meter, and does not complicate the facilities and construction, prevents the cold water whose temperature is raised by simple control from being sent to the load, and compensates the secondary side cold water feed temperature.

  Furthermore, since the load factor of the heat source can be maintained at a high level by controlling the flow rate of the heat source, the power consumption of the air conditioner can be reduced.

  FIG. 1 shows a configuration of an air conditioner according to the present embodiment, which is configured as a hermetic type air conditioning system with a primary side as a heat source and a secondary side as a load via a header. Here, the cooling operation is performed, and the refrigerator 5 is provided as a heat source. Cold water (heat source water) supplied from a plurality of refrigerators (heat sources) 5 is supplied to a plurality of loads 6 from the forward and backward headers 1a and 1b, and the reflux water whose temperature has been increased by heat exchange at the loads 6 Is returned to the refrigerator 5 from the return primary header 2a and the return secondary header 2b, and a circulation path is formed in which cooling water is supplied again to the load 6 by cooling. In FIG. 1, descriptions of pumps and valves that are not directly involved in the configuration and control of this embodiment are omitted.

  The plurality of refrigerators 5 can be temperature-set so that cold water at a predetermined temperature (for example, 7 to 9 ° C.) can be supplied, and is configured to be variable in temperature so that the set temperature can be changed by the control unit 4. The chilled water supplied from the plurality of refrigerators 5 is concentrated on the forward and backward headers 1a, sent from the forward header connecting pipe 1c to the forward and secondary headers 1b, and distributed to the multiple loads 6 from the forward and secondary headers 1b. Delivery is paid.

  The load 6 is an air conditioner or the like, and performs heat exchange between the supplied cold water and air to cool the cooling air. The chilled water whose temperature has risen due to heat exchange in the plurality of loads 6 is concentrated as reflux water on the return primary header 2a, sent from the return header connecting pipe 2c to the return secondary header 2b, and distributed by the return secondary header 2b. Each is recirculated from the cold water pump (heat source pump) 3 to the plurality of refrigerators 5. The operation flow rate by the cold water pump 3 is constant, but the first cold water pump 3-1 that supplies water to the first refrigerator 5-1 is configured to have a variable flow rate that is adjusted by the control unit 4. Has been.

  Further, when the balance pipe 7 is connected between the connection line 1c between the forward headers and the connection line 2c between the return headers, and there is a difference in the flow rate between the primary side and the secondary side, the forward header A balanced water flow flows from the inter-connection pipe line 1c to the return header connection pipe line 2c, or from the return header connection pipe line 2c to the forward header connection pipe line 1c.

  In order to detect the water temperature at the key points of the chilled water circulation path, the chilled water temperature sensor (heat source water temperature detecting means) 11 and the outlet of the return primary header 2a are used to detect the water temperature T1 in the connecting line 1c between the forward headers. A reflux water primary temperature sensor (reflux water primary temperature detection means) 12 for detecting the water temperature T2, a reflux water secondary temperature sensor (reflux water secondary temperature detection means) 13 for detecting the water temperature T3 at the inlet of the return secondary header 2b, Balance water temperature sensors (balance pipe water temperature detecting means) 14 for detecting the water temperature T4 in the balance pipe 7 are provided, and the detected temperatures by the respective temperature sensors are input to the control unit 4. Let the cold water inlet temperature of the load be SP.

  The control unit 4 controls the outlet temperature of the refrigerator 5 so that the water temperature T1 in the forward header connecting pipe 1c input from the cold water temperature sensor 11 coincides with the SP, and from the reflux water primary temperature sensor 12. The operation of the first cold water pump 3-1 is controlled such that the input outlet water temperature T2 of the return primary header 2a matches the inlet water temperature T3 of the return secondary header 2b input from the reflux water secondary temperature sensor 13. To do. Hereinafter, the operation control procedure of the air conditioner by the control unit 4 will be described with reference to the flowchart shown in FIG. 2, S1, S2,... Are step numbers indicating control procedures, and coincide with numbers appended in the text.

  First, the temperature is set so that the outlet temperature of the cold water delivered from each refrigerator 5 becomes SP (for example, 9 ° C.) (S1), and the operation of the air conditioner is started. When the operation is started, the cold water is supplied to the load 6, returned to the refrigerator 5 as the reflux water, and chilled water to be cooled and fed again is circulated, so that each temperature sensor inputs the detected temperature to the control unit 4. (S2).

  The control unit 4 compares the outlet water temperature T2 of the return primary header 2a input from the reflux water primary temperature sensor 12 with the inlet water temperature T3 of the return secondary header 2b input from the reflux water secondary temperature sensor 13, It is determined whether or not T2> T3 (S3). If T2> T3, the operation flow rate of the first chilled water pump 3-1 is decreased to return water to the first refrigerator 5-1. Is decreased (S4). Whether or not it can continue to be decreased is determined by a sudden change in the water temperature T4 in the balance pipe 7 (S6), and in the case of a sudden change, it returns to S3 and determines that T2 = T3, and the first cold water pump 3- 1 is increased to increase the flow rate of the reflux water to the first refrigerator 5-1 (S5). If the water temperature T4 in the balance pipe 7 has not changed suddenly (S6), T2 and T3 are compared again (S7), and the operating flow rate of the first cold water pump 3-1 is decreased until T2 = T3. Continue (repeat of S3-> S4-> S6-> S7-> S3).

  Since the reflux water primary temperature sensor 12 and the reflux water secondary temperature sensor 13 detect the water temperature at both ends of the return header connecting pipe line 2c, the cooling water is supplied from the balance pipe 7 to the return header connecting pipe 2c. Since cold water is mixed with the reflux water when there is an inflow, the detected temperature T3 of the reflux water secondary temperature sensor 13 decreases and T2> T3. That is, the state in which the chilled water flows from the balance pipe 7 to the return header connecting pipe line 2c can be determined to be a state in which the load 6 has decreased, so that the control unit 4 controls the first chilled water pump 3-1 as in the control step S4. Control which reduces the flow volume of the recirculation | reflux water with respect to the 1st refrigerator 5-1 by reducing an operation flow volume is performed. As a result, the flow rate of the cold water flowing into the return header connecting pipe line 2c decreases, and there is no cold water flowing into the balance pipe 7, and T2 = T3. At this time, by monitoring a sudden change in the water temperature T4 in the balance pipe 7, the flow rate can be stopped and increased quickly, and a stable state of T2 = T3 can be realized. In the state of T2> T3, the inlet temperature of the refrigerator 5 is low, the temperature difference between the inlet and outlet of the refrigerator 5 is small, and the load factor is also low. That is, realizing T2 = T3 by the earlier flow rate change maintains the load factor of the refrigerator 5 high and suppresses power consumption (the relationship between the load factor and power consumption will be described later).

  Further, since the temperature T4 of the water flowing in the balance pipe 7 is detected by the balance water temperature sensor 14 and inputted to the control unit 4, when it is detected that the water temperature T4 in the balance pipe has suddenly changed (S6), the load state is changed. It can be judged that it has fluctuated. That is, when the load 6 increases, the reflux water flows from the return header connecting pipe 2c through the balance pipe 7 to the forward header connecting pipe 1c, so that the balance water temperature sensor 14 detects the temperature of the reflux water (for example, 17 ° C) is detected.

  Conversely, when the load 6 decreases, cold water flows from the forward header connecting pipe 1c to the return header connecting pipe 2c through the balance pipe 7, so that the balance water temperature sensor 14 detects the temperature of the cold water (for example, 9 ° C.). To do. That is, the temperature of the water flowing in the balance pipe 7 changes suddenly depending on the flow direction. The control unit 4 monitors the temperature detected by the balance water temperature sensor 14 to determine whether or not the flow control by the first cold water pump 3-1 has been normally performed by the control operations of the control steps S3 to S5 described above. The control correction operation can be executed.

  By executing the flow rate adjustment by the first cold water pump 3-1, there is no circulation of cold water or reflux water through the balance pipe 7, so that T2 = T3 and a predetermined amount of cold water of a predetermined temperature is supplied to the load 6. (S7).

  Further, the control unit 4 monitors the input detected temperature, and when a difference occurs between the water temperature T1 and SP in the connecting line 1c between the forward headers (S8), when T1> SP. Then, the set temperature of the refrigerator 5 is changed to the lower side, and the outlet temperature SP of the cold water sent from the refrigerator 5 is controlled to be lowered (S9). On the other hand, when T1 <SP, the set temperature of the refrigerator 5 is changed to a higher side, and control is performed so that the outlet temperature of the cold water sent from the refrigerator 5 becomes higher (S10).

  When the load 6 varies, the flow rate of the cold water supplied from the forward / secondary header 1b to the load varies, so that a water flow is generated in the balance pipe 7. When the load 6 increases, the flow rate of the cold water supplied from the forward / secondary header 1b to the load increases, so that the forward header connecting pipe 1c passes from the return header connecting pipe 2c through the balance pipe 7. The water flow toward the water is generated, and the reflux water having a high temperature is mixed with the cold water sent from the refrigerator 5.

  Therefore, the chilled water temperature T1 in the connecting line 1c between the forward headers rises to satisfy T1> SP, that is, the temperature of the chilled water supplied to the load 6 becomes higher than SP (for example, 9 ° C.). As shown in the control step S9, the set temperature of the refrigerator 5 is changed to a lower side to control the outlet temperature of the cold water sent from the refrigerator 5 to be lower (S9). By this control, the temperature of the cold water supplied to the forward / first header 1a is lowered and mixed with the high-temperature reflux water flowing from the balance pipe 7 into the forward header connecting pipe 1c. The flowing cold water temperature T1 is T1 = SP. For example, when the outlet temperature of the refrigerator 5 is lowered to 7 ° C., even if reflux water of about 16 ° C. from the balance pipe 7 flows in, T1 = 9 ° C. is possible because the flow rate from the refrigerator 5 is large. .

  The control unit 4 continuously monitors the detected temperature input from each sensor, and executes the control operation after the control step S3 when the conditions of T2 = T3 and T1 = SP are broken.

  Due to the configuration and control method of the air conditioner described above, the difference between the inlet side temperature (reflux water temperature) and the outlet side temperature (cold water temperature) of each refrigerator 5 is large, and each refrigerator 5 is operated at a high load factor. be able to. As shown in the graph of FIG. 3, the characteristics of the refrigerator 5 are preferably operated at a high load factor because each of the refrigerators 5 is operated at a high load factor because the ratio to the power consumption is improved when the cooling capacity is high. As long as the cooling capacity of the refrigerator 5 does not exceed 100% due to an increase of 6, the refrigerator 5 is not increased in stage, and the air conditioner that suppresses power consumption by operating a small number of refrigerators at a high load factor. Driving is possible. The power consumption ratio on the vertical axis and the cooling capacity ratio on the horizontal axis in FIG. 3 are each expressed as a percentage of the rated value.

  In addition, although the said embodiment showed the structure and control method at the time of air_conditionaing | cooling operation which used the refrigerator as a heat source, the structure and control method of heating operation can be implemented similarly by using a heater as a heat source.

  Further, in this embodiment, the balance pipe 7 is provided between the outgoing header connecting pipe 1c and the returning header connecting pipe 2c, but the outgoing secondary header 1b or the returning secondary header 2b is connected to at least one of them. Otherwise, the connection position of the forward header and the return header is not limited. This is because the connection to each secondary header is supplied to a load or a heat source without the inflow water from the balance pipe 7 being sufficiently mixed.

  Further, when it is desired to only compensate the secondary side cold water supply temperature, the reflux water primary temperature sensor (reflux water primary temperature detection means) 12, the reflux water secondary temperature sensor (reflux water secondary temperature detection means) 13, balance The structure of variable flow rate for the water temperature sensor (balance pipe water temperature detecting means) 14, the first chilled water pump 3-1 and the control procedure of S3 to S7 in FIG. 2 are not required, and the water supply temperature rises with a simple structure and control. It is possible to prevent the chilled water from being sent to the load.

  As described above, according to the present invention, the flow rate balance between the primary side and the secondary side due to load fluctuations can be quickly detected by the pipe connection structure and the arrangement of the temperature detection means at the important points. Then, the temperature control and flow rate control of the heat source are executed by the control means, and control is performed to maintain the load factor of the heat source at a high state. Accordingly, it is possible to reduce the cost of facilities and construction for installing a relatively large air conditioner, and to reduce the running cost by reducing the power consumption.

  The air conditioner of the present invention and the control method thereof supply heat source water generated by the heat source to the load via the forward header, and return the reflux water that has been heat exchanged by the load to the heat source via the ring header to recover the heat. It can be used for an air conditioner that supplies the load again.

The block diagram which shows the structure of the air conditioner which concerns on embodiment The flowchart which shows the control procedure of an air conditioner same as the above Graph showing the relationship between cooling capacity and power consumption of refrigerators The block diagram which shows the structure of the air conditioner which concerns on a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Outgoing primary header 1b Outgoing secondary header 1c Outgoing header connection line 2a Returning primary header 2b Returning secondary header 2c Returning header connection line 3-1 1st cold water pump (1st heat source pump)
3 Cold water pump (heat source pump)
4 Control unit (control means)
5 Refrigerator (heat source)
6 Load 7 Balance tube 11 Chilled water temperature sensor (heat source water temperature detection means)
12 Reflux water primary temperature sensor (Reflux water primary temperature detection means)
13 Reflux water secondary temperature sensor (Reflux water secondary temperature detection means)
14 Balance water temperature sensor (balance pipe water temperature detection means)

Claims (9)

An air conditioner having a primary side as a heat source and a secondary side as a load via a forward header and a return header,
Heat source water sent from a plurality of heat sources by a heat source pump is concentrated on the forward header, the heat source water is supplied to each of a plurality of loads, and the reflux water from each load is concentrated on the return header to each heat source. Connect the pipe so as to return the reflux water, and connect a balance pipe between the forward header and the return header,
A heat source water temperature detecting means for detecting the temperature of the heat source water in the forward header is provided,
An air conditioner comprising control means for controlling the temperature of the heat source based on the temperature detected by the heat source water temperature detection means. Reflux water primary temperature detecting means for detecting the temperature of the reflux water at the return header inlet, reflux water secondary temperature detecting means for detecting the temperature of the reflux water at the return header outlet, and detecting the water temperature in the balance pipe Providing a water temperature detecting means in the balance pipe,
Control for performing temperature control of the heat source and flow rate control by the heat source pump based on the temperatures detected by the heat source water temperature detection means, reflux water primary temperature detection means, reflux water secondary temperature detection means and balance pipe water temperature detection means. The air conditioner according to claim 1, further comprising means. The air conditioner according to claim 2, wherein a heat source pump corresponding to a specific heat source among the plurality of heat sources has a variable flow rate structure, and a flow rate of the heat source pump is controlled by a control unit. The forward header is composed of a forward primary header that focuses heat source water sent from a plurality of heat sources by the heat source pump, and a forward secondary header that supplies the heat source water to each of the plurality of loads, and the return header is The air conditioner according to claim 1, comprising a return primary header for converging the reflux water from each load and a return secondary header for returning the reflux water to each heat source. It is an air conditioner control method in which the primary side is a heat source and the secondary side is a load via at least a forward header consisting of a forward primary header and a secondary secondary header and a return header consisting of at least a primary return header and a secondary return header. And
The air conditioner focuses heat source water sent from a plurality of heat sources by a heat source pump on the forward and primary headers, supplies heat source water to each of a plurality of loads from the forward and secondary headers, and supplies reflux water from each load. A pipe that converges on the return primary header and pipes the return water from the return secondary header to each heat source and connects the return primary header and the return primary header to the return secondary header inlet. Constructed by connecting a balance pipe to the road,
A method for controlling an air conditioner, comprising: detecting a temperature of a heat source water in a pipe line from the forward primary header to the forward secondary header, and controlling the temperature of the heat source based on the heat source water temperature. Based on the temperature difference between the reflux water primary temperature and the reflux water secondary temperature by detecting the reflux water primary temperature at the return primary header outlet and the reflux water secondary temperature at the return secondary header inlet. 6. The method for controlling an air conditioner according to claim 5, wherein the flow rate of the heat source pump is controlled, and the flow rate of the heat source pump is controlled based on detection of a water temperature in the balance pipe. The method of controlling an air conditioner according to claim 5, wherein the temperature of the heat source is controlled so that the temperature of the heat source water in the forward header matches the temperature of the heat source water sent from the heat source. The method of controlling an air conditioner according to claim 6, wherein the flow rate of the heat source pump corresponding to a specific heat source among a plurality of heat sources is controlled based on a temperature difference between the primary temperature of the reflux water and the secondary temperature of the reflux water. The method of controlling an air conditioner according to claim 6, wherein the flow rate of the heat source pump corresponding to a specific heat source among a plurality of heat sources is controlled based on detection of a water temperature in the balance pipe.

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