JP6873194B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner .

Conventionally, the air conditioning system of a building connects an outdoor cold / hot water heat source unit and an indoor cold / hot water air conditioner with a water pipe, and supplies air conditioning air from the cold / hot water air conditioner to the room using a duct. , The configuration is such that outside air is introduced so that the carbon dioxide in the room does not exceed the standard value. Alternatively, the heat pump type outdoor unit and the indoor unit are connected by a refrigerant pipe without using cold / hot water.

Japanese Unexamined Patent Publication No. 2016-217561 Japanese Unexamined Patent Publication No. 2000-274777 Japanese Unexamined Patent Publication No. 2001-280859

In the case of the cold / hot water type, since the air conditioner is installed on the floor, a machine room dedicated to the air conditioner is required in the building, and there is a problem that the rentable ratio is lowered. Furthermore, in order to simultaneously perform cooling operation and heating operation with a cold / hot water type air conditioner, a water heat source facility called a 4-tube type that simultaneously sends cold water and hot water to the cold / hot water type air conditioner is required, and the equipment cost and operating cost are high. Become. On the other hand, in a water heat source facility that switches between cold water and hot water and sends them to a cold / hot water type air conditioner, which is called a two-tube type, there is a problem that the cooling operation and the heating operation cannot be performed at the same time, and the comfort is impaired.

In addition, the air conditioner is equipped with a heat exchanger that exchanges heat between the air for air conditioning and the water for heat exchange, adjusts the amount of heat exchange by increasing or decreasing the flow rate of the water for heat exchange, and cools or heats the air for air conditioning. Controls the ability to do. By dividing the heat transfer tube group of this heat exchanger into two groups equally, the lower limit flow rate of the heat exchange water is reduced and the lower limit capacity control range of the heat exchange coil is expanded. However, since the heat transfer tube group is divided equally, there is a limit to the lower limit flow rate of heat exchange water, and in the low air conditioning load range where a small amount of heat exchange (through heat amount) is sufficient, the capacity becomes excessive and it is overcooled or overheated. There is a problem that the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger is not constant.

Further, in a building such as a building in which a plurality of tenants are occupying, a heat source device such as a chiller is shared to perform air conditioning, and it is necessary to prorate and charge the air conditioning fee for each tenant. As a billing system for that purpose, there is a system in which the air conditioning charge is calculated and apportioned from the product of the opening degree of the water amount control valve of the heat exchanger provided in the air conditioner and the operating time. In such a billing system, the amount of water flowing through the heat exchange coil can be calculated, but since the amount of energy actually used for heat exchange is unknown, there is a problem that the calculation of the air conditioning charge is not accurate.

In order to solve the above problems, the present invention includes an air conditioner having a heat exchanger for selectively flowing cold water or hot water as heat exchange water, and a control device, and the heat exchanger is the heat exchange water. The heat transfer tube group in which the heat transfer tubes are distributed is provided in a plurality of groups and the distribution ratio is different, and the control device is provided with a single and minimum distribution ratio of the distribution circuit in the case of a low air conditioning load. In the first group, the heat exchange of the air conditioner is provided with a temperature compensating unit for controlling the temperature difference of the heat exchange water generated by heat exchange of the heat exchanger by increasing or decreasing the flow rate of the heat exchange water. When viewed from the direction of the flow of air passing through the vessel, a non-overlapping zone that does not overlap with the first group is formed in the second group excluding the first group of the diversion circuit, and the first group is formed. The most important feature is that the diversion circuit is configured so that one group is sandwiched between the non-overlapping zones.

According to the invention of claim 1 , in the case of a low air conditioning load, the lower limit flow rate can be further minimized by increasing or decreasing the flow rate of the heat exchange water in the first group of the shunt circuit of the heat exchanger. Therefore, the lower limit capacity control range of the heat exchanger is widened, and even in the case of a low air-conditioning load, the capacity is not excessive, energy wasting, overcooling and overheating are eliminated, and energy saving and comfort are improved.

During cooling, the heat exchange water is circulated to the first group of the heat exchanger's diversion circuit so that it is not circulated to the second group, and the supercooled and dehumidified air that has passed through the first group has passed through the non-overlapping zone. By reheating with bypass air that is hotter than supercooled dehumidified air, it is possible to obtain dry air without an unpleasant feeling of coldness. At this time, since the supercooled dehumidified air is sandwiched between the bypass airs so as not to escape, mixing is promoted and reheating can be reliably performed. Therefore, even in the middle period when the humidity is high and it gets damp, air conditioning can be performed with a crisp air flow without cold draft, and comfort is improved. Moreover, equipment such as a bypass damper is not required, and cost reduction and compactness can be achieved.

According to the invention of claim 2, since the temperature difference of the heat exchange water of the heat exchanger is controlled to be constant even under a low air conditioning load, the air conditioner can be operated with a small amount of water and a large temperature difference, and piping and air conditioning by reducing the amount of water. It is possible to simplify the equipment and save energy in the heat source machine by increasing the temperature difference. The temperature difference of the heat exchange water of the heat exchanger can be controlled to be constant, and the energy consumption of the air-conditioned space can be calculated based on the temperature difference of the heat exchange water and the flow rate of the heat exchange water. Therefore, the air-conditioning charge can be accurately calculated and apportioned by comparing the energy consumption of each air-conditioned space.

Since it is only necessary to measure the flow rate and temperature of the heat exchange water of the heat exchanger, and the operation of the air conditioner and the output of the energy consumption can be performed with one control device, the equipment and construction can be simplified and the cost can be reduced.

According to the invention of claim 3, since the number of operating heat source units is increased or decreased according to the increase or decrease in the energy consumption of the air conditioner, the energy waste of the heat source unit can be suppressed and energy saving can be achieved.

According to the invention of claim 4, the dead water region of the heat transfer tube group of the heat exchanger is reduced, the ventilation resistance of the heat transfer tube group is small to save energy, and the contact area (through heat amount) with the air conditioning air is increased to generate heat. Exchange efficiency is improved. Therefore, it is possible to operate with a small amount of water and a large temperature difference without increasing (increasing the size) the heat transfer area of the heat exchanger.

It is a simplified plan view of the air conditioner of this invention. It is a simplified side view of FIG. It is a simplified explanatory drawing of an air conditioner. It is a perspective view which shows the heat exchanger. It is a simplified explanatory view of the arrow A view of FIG. It is a simplified explanatory view of the arrow B view of FIG. It is a side sectional view of the external air conditioner. It is a perspective view of the attraction radiation unit. It is sectional drawing of the attract radiation unit. It is a flowchart which shows an example of the air-conditioning operation.

1 to 3 are an embodiment of the air conditioner of the present invention. The air conditioner includes an air conditioner 1, a water heat source equipment 2, and a control device 3, and is installed in a building such as a building. Two or more sets of air-conditioning equipment 1 are installed on the ceiling of one or a plurality of air-conditioned spaces S in the building. The air-conditioned space S is formed by partitioning each floor of the building by a ceiling, a floor, a wall, or the like. The air conditioner 1 includes an external air conditioner 4, an air conditioner 5, and an attractive radiation unit 6. The thick dotted arrow in each figure indicates the direction of air flow.

The external air conditioner 4 has a heat pump 50 capable of switching between cooling operation and heating operation, and uses the return air of the air-conditioned space S as heat source air. The outside air (OA) is heat-exchanged (cooled or heated) with the heat exchange refrigerant of the heat pump 50 to supply air (SA). The air conditioner 5 has a heat exchanger 20 for water that selectively circulates cold water or hot water as heat exchange water. With the heat exchange water of the heat exchanger 20, the outside air supplied from the external air conditioner 4 and the return air (RA) of the air-conditioned space S are heat-exchanged (cooled or heated) and supplied as air-conditioning air (cooling or heating). SA). Alternatively, only the outside air or the mixed air of the outside air and the return air is supplied as air conditioning air without heat exchange with the heat exchange water of the heat exchanger 20.

The attracting radiation unit 6 attracts and mixes the return air of the air-conditioned space S with the air-conditioning air supplied from the air conditioner 5, and radiates the heat of the mixed air while discharging the mixed air to the air-conditioned space S. .. They are connected to each other via a duct 7 so that air can flow between the attraction radiation unit 6, the air conditioner 5, the external air conditioner 4, and the outdoors. The duct 7 is shown simply by a thick solid line in FIGS. 1 and 2. In the illustrated example, the air conditioner 1 is installed in the ceiling pocket provided by partitioning the air-conditioned space S by the ceiling plate 8. The ceiling pocket is used as a ceiling chamber, and the return air of the air-conditioned space S is taken into the ceiling pocket from the air intake 9 provided in the ceiling plate 8.

The water heat source equipment 2 is a two-tube type and includes a heat source machine 10 and a circulation device 11. The heat source machine 10 cools or heats the heat exchange water provided in the heat exchanger 20 of the air conditioner 5, and adjusts the water temperature so that the water becomes cold water or hot water suitable for heat exchange. A plurality of heat source machines 10 are provided so that each unit can be individually started and stopped and can switch between cold water and hot water. The circulation device 11 circulates heat exchange water between the heat source machine 10 and the air conditioner 5. The circulation device 11 includes an forward pipe 12 for sending heat exchange water from the heat source machine 10 to the air conditioner 5, a return pipe 13 for returning the heat exchange water from the air conditioner 5 to the heat source machine 10, and a pump 14 for transporting the heat exchange water. There is.

The air conditioner 5 includes a heat exchanger 20, a valve 33 that adjusts the flow rate of heat exchange water flowing through the heat exchanger 20, a humidifier 21 that humidifies the air that has passed through the heat exchanger 20, and an air supply fan 22. Air is separated from the rotation controller 23 that adjusts the air supply air volume by steplessly or stepwise controlling the rotation speed of the fan 22, the casing 24 that houses the heat exchanger 20, the humidifier 21, and the fan 22. A branch chamber portion 25 is provided.

The branch chamber portion 25 is connected to a plurality of attractive radiation units 6 via a duct 7. The casing 24 is provided with a return air port 26. The fan 22 passes the outside air supplied from the external air conditioner 4 and the return air taken in from the air-conditioned space S through the air intake port 9 and the return air port 26 to the heat exchanger 20 and the humidifier 21. Then, air is blown from the branch chamber portion 25 to the attracting radiation unit 6 through the duct 7.

As shown in FIGS. 4 to 6, the heat exchanger 20 includes a fin group 27 and a flow dividing circuit 28. The fin group 27 is composed of a large number of plate fins 29 arranged so as to allow air for air conditioning to pass through. The shunt circuit 28 distributes the heat transfer tube group 30 through which the heat exchange water flows to a plurality of groups G and has different distribution ratios. As a result, the heat transfer area (heat exchange amount) of some or all of the group G is made different. For example, the first group G (G1) having a single and minimum distribution ratio shown by the thick alternate long and short dash line in FIG. 5 and the second group G (G1) having a large distribution ratio shown by the thin alternate long and short dash line in FIG. 5 excluding the first group (G1). Divide into group G (G2). The heat transfer tube group 30 meanders across the air flow direction of the air conditioning air and is connected to the fin group 27. The straight tube portion of the heat transfer tube group 30 is preferably formed of an elliptical tube, but may be a circular tube.

The heat exchange water inlet of the first group G1 is connected to the first branch header 31, and the heat exchange water inlet of the second group G2 is connected to the second branch header 31. Both the heat exchange water outlets of the first group G1 and the second group G2 are connected to the merging header 32. The branch header 31 is connected to the outgoing pipe 12 via the valve 33, and the merging header 32 is connected to the return pipe 13. Valve 33 is a proportional control valve that can adjust the flow rate (valve opening degree) steplessly, you adjust the separate flow provided to each group G of the shunt circuit 28. The increase / decrease in the cooling capacity and the heating capacity of the air conditioner 5 is adjusted by combining the flow rate control of the heat exchange water flowing through the shunt circuit 28 and the air supply air volume control of the fan 22. The shunt circuit 28 extends toward the airflow direction while the heat transfer tube group 30 meanders across the airflow direction of the air passing through the heat exchanger 20, and when viewed from the airflow direction, the second group A non-overlapping zone F in which G2 and the first group G1 do not overlap and only the second group G2 is included, and an overlapping zone in which the second group G2 and the first group G1 overlap are formed in a laminated manner, and the overlap is described. The zones are configured to be sandwiched between non-overlapping zones F. The control device 3 controls the valve 33 so that, for example, during cooling, cold water is circulated to the first group G1 of the shunt circuit 28 of the heat exchanger 20 and not to the second group G2.

As shown in FIGS. 3 and 7, the external air conditioner 4 includes a heat pump 50, a humidifier 40 that humidifies the outside air, and an outside air supply that supplies the outside air (OA) from the outside air conditioner 4 to the air conditioner 5. The fan 41, the heat source air exhaust fan 42 that exhausts the return air (RA) to the outside (EA), the outside air air supply fan 41, and the heat source air exhaust fan 42 are supplied by steplessly or stepwise controlling the rotation speed. It is provided with a rotation controller 43 for adjusting the air air volume and the exhaust air volume, a casing 45 for incorporating them, and a slide mechanism 46 for moving the heat pump 50 in and out from the bottom of the casing 45. The casing 45 is provided with a return air port 54.

The slide mechanism 46 includes a frame 47 to which the heat pump 50 is attached and a damper 48 for moving the frame 47 up and down. The damper 48 is provided so as to straddle the casing 45 and the frame 47. For maintenance and inspection of the external air conditioner 4, the inspection port 44 provided on the ceiling plate 8 is opened, the exterior plate 49 closing the opening on the bottom surface of the casing 45 is removed, and the heat pump 50 is installed together with the frame 47 using the slide mechanism 46. Take it down. The damper 48 expands and contracts due to the pressure of gas or oil to reduce the physical burden on the operator.

As shown in FIG. 3, the heat pump 50 is an integrated type having a heat exchanger 51 for outside air, a heat exchanger 52 for heat source air, and a compressor 53, which does not require refrigerant piping work. The outside air supply fan 41 takes in outside air from the outside through the duct 7, passes it through the outside air heat exchanger 51, and blows air from the external air conditioner 4 to the air conditioner 5 via the duct 7 to supply the air. The heat source air exhaust fan 42 takes in return air from the air-conditioned space S through the air intake port 9 and the return air port 54, passes it through the heat source air heat exchanger 52, and passes the duct 7 from the external air conditioner 4. Exhaust to the outside through.

The heat pump 50 repeats the steps of compression, condensation, expansion, and evaporation of the refrigerant, and absorbs heat in the refrigerant evaporation step and dissipates heat in the refrigerant condensation step for the air that exchanges heat with the refrigerant. The heat pump 50 expands the refrigerant, the outside air heat exchanger 51 and the heat source air heat exchanger 52, which are the refrigerant evaporation process and the refrigerant condensation process, and the compressor 53 that compresses and conveys the refrigerant. It is provided with at least a pressure reducing mechanism 55 such as an expansion valve for causing the refrigerant to be operated, and a switching mechanism 56 such as a valve for switching between the evaporation process and the condensation process of the heat exchanger 51 for outside air and the heat exchanger 52 for heat source air, and the refrigerant circulates therein. It consists of connecting pipes like this.

Similar to the heat exchanger 20 of the air conditioner 5, the heat exchanger 51 for outside air and the heat exchanger 52 for heat source air have a structure in which a heat transfer tube group through which a heat exchange refrigerant flows is connected to a fin group through which air passes. Then, the heat exchange refrigerant and the passing air exchange heat via the heat transfer tube group and the fin group (not shown). The heat transfer tube group is preferably formed of an elliptical tube, but may be a circular tube. The increase / decrease in the cooling capacity and the heating capacity of the external air conditioner 4 is adjusted by combining the outside air cooling or heating capacity control of the outside air heat exchanger 51 and the supply air volume control of the outside air supply fan 41.

As shown in FIGS. 8 and 9, the attraction radiation unit 6 includes an air supply unit 60, an air attraction unit 61, and an air mixing unit 62, and an air-conditioned space is provided on the bottom surface of the air mixing unit 62 from the opening of the ceiling plate 8. Install in a state facing S. The air supply unit 60 jets the supply air of the air conditioner 5, and the air attraction unit 61 draws the return air of the air-conditioned space S by the action of attracting the jet air. The air mixing unit 62 includes a plate 63 for storing the heat of the mixed air and a group of through holes 64, and radiates heat from the plate 63 to the air-conditioned space S through the through holes 64 while radiating the mixed air to the air-conditioned space S. Release to.

As shown in FIGS. 2 and 5, the control device 3 includes a setting unit 70 for setting the temperature and humidity of the air-conditioned space S and a temperature difference between the heat exchange water, an air condition detection unit 71, and a water condition detection unit 72. The air conditioning control unit 73, the temperature compensation unit 74, the energy consumption monitoring unit 75, and the heat source control unit 76 are provided, and these are composed of a microprocessor, various sensors, switches, and other control devices.

The air condition detection unit 71 includes a return air sensor 77 that detects the temperature and humidity of the air (return air) in the air-conditioned space S. The water state detection unit 72 includes a flow meter 78 that detects the flow rate of the heat exchange water in each air-conditioned space S, and a water temperature meter 79 that detects the inlet water temperature and the outlet water temperature of the heat exchange water of the heat exchanger 20. .. The flow meter 78 is provided in the forward pipe 12 or the return pipe 13 of each air-conditioned space S, and the water temperature gauge 79 is provided in the forward pipe 12 and the return pipe 13 connected to the heat exchanger 20 of each air conditioner 5. The water state detection unit 72 may be a calorimeter in which a flow meter 78 and a water temperature gauge 79 are integrated.

The air conditioning control unit 73 has a cooling capacity of the air conditioning device 1 so that the temperature and humidity of the air in the air-conditioned space S detected by the air detection unit 46 becomes the temperature and humidity of the air-conditioned space S set by the setting unit 70. And control the heating capacity, and control the amount of humidification of the humidifiers 21 and 40 of the air conditioner 1. Further, the air conditioning control unit 73 switches between a first operation pattern in which the air conditioning device 1 is operated and stopped in groups, and a single operation of the external air conditioner 4 and simultaneous operation of the external air conditioner 4 and the air conditioner 5. The second operation pattern, the third operation pattern in which the operating air-conditioning device 1 and the stopped air-conditioning device 1 are replaced, and the fourth operation pattern in which the air conditioning capacity of one or both of the external air conditioner 4 and the air conditioner 5 is increased or decreased. It has an operation pattern, and air-conditions the air-conditioned space S by switching or combining the first to fourth operation patterns.

For example, as the difference between the temperature and humidity of the air in the air-conditioned space S and the preset temperature and humidity (air-conditioning load) decreases, the operation pattern of the air-conditioning device 1 is switched in the order of first and second. To reduce the air conditioning capacity. When the first, second, and fourth operation patterns are combined, the control range of the temperature and humidity of the air-conditioned space S is expanded, and more detailed air conditioning can be performed. When the third operation pattern is additionally combined with these operation patterns, the operation is not biased only to the specific air conditioner 1.

In the above operation pattern, the external air conditioner 4 is operated by operating the compressor 53 of the heat pump 50, the outside air supply fan 41, and the heat source air exhaust fan 42, and the air conditioner 5 is operated. , Each valve 33 is opened to distribute heat exchange water to the heat exchanger 20 and the fan 22 is operated. The external air conditioner 4 is stopped by stopping the compressor 53 of the heat pump 50, and the air conditioner 5 is stopped by fully closing each valve 33 to stop the flow of heat exchange water of the heat exchanger 20.

The temperature compensation unit 74 increases or decreases the flow rate of the heat exchange water in the first group G1 of the flow dividing circuit 28 in the case of a low air conditioning load, and constantly controls the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger 20. At the same time, the temperature of the air-conditioned space S is controlled by increasing or decreasing the air supply air volume of the air conditioner 5. Further, the temperature compensation unit 74 increases or decreases the flow rate of the heat exchange water in all groups G in the case of a high air conditioning load to control the temperature difference of the heat exchange water to be constant, and between the high air conditioning load and the low air conditioning load. In the case of the normal air conditioning load of the above, the temperature difference of the heat exchange water is controlled to be constant by increasing or decreasing the flow rate of the heat exchange water in the second group G2. As a result, there is a wide range of air-conditioning loads, from high air-conditioning loads that require the maximum amount of heat exchange, such as midsummer and midwinter, to low-air-conditioning loads that require a small amount of heat exchange, such as in the middle period. Can handle small water volume and large temperature difference operation.

The energy consumption monitoring unit 75 is an air-conditioned space based on the flow rate of heat exchange water provided to the heat exchanger 20 of the air conditioner 5 and the temperature difference of the heat exchange water generated by the heat exchange of the heat exchanger 20. The energy consumption for each S is calculated and the data is output. The heat source control unit 76 outputs a signal for increasing or decreasing the number of operating heat source machines 10 according to the increase or decrease in the energy consumption of all the air-conditioned spaces S data output by the energy consumption monitoring unit 75.

FIG. 10 shows an example of air conditioning operation. After the start of the air conditioning operation, the external air conditioner 4 is not operated and only the air conditioner 5 is operated to maximize the flow rate of the heat exchange water of the heat exchanger 20 and the air supply air volume of the fan 22 to perform the warm-up operation. When the temperature of the air-conditioned space S (return air temperature) falls within the allowable range of the return air temperature set in advance, the operation of the external air conditioner 4 is started. After that, when the temperature difference (water temperature difference) of the heat exchange water generated by the heat exchange of the heat exchanger 20 of the air conditioner 5 is out of the preset allowable range of the water temperature difference, the heat is adjusted so as to approach the set water temperature difference. The flow rate of heat exchange water of the exchanger 20 is controlled. By this process, when the return air temperature deviates from the allowable range of the set return air temperature, the supply air volume of the fan 22 is controlled so as to approach the set return air temperature. These processes are repeated until the air conditioning operation of the air conditioner 5 is stopped.

The present invention is not limited to the above-mentioned examples. The number of sets of the air conditioner 1 may be increased or decreased according to the design air conditioning capacity, or if the required air conditioning capacity is exceeded, the external air conditioner 4 of an appropriate set of the air conditioner 1 may be omitted. In the illustrated example, the group G of the shunt circuit 28 is distributed to two groups G1 and G2, but it is also free to distribute the group G to three or more groups G and set one group G as the minimum distribution ratio. Although the attracting radiation unit 6 is installed on the ceiling plate 8, it may be installed on the wall surface forming the air-conditioned space S. Further, the air conditioner 1 may be installed on the ceiling with the ceiling plate 8 omitted.

1 Air conditioner 3 Control device 4 External conditioner 5 Air conditioner 6 Induction radiation unit 10 Heat source machine 20 Heat exchanger 28 Divergence circuit 30 Heat transfer tube group 45 Casing 46 Slide mechanism 50 Heat pump 51 Heat exchange for outside air 52 Heat exchange for heat source air Unit 53 Compressor 73 Air conditioning control unit 74 Temperature compensation unit 75 Energy consumption monitoring unit 76 Heat source control unit F Non-overlapping zone G Group S Air-conditioned space

Claims (4)

Heat exchanger for selectively circulating cold water or hot water is heat exchanged water (20) the air conditioner having the (5), comprising,
The heat exchanger (20) includes a flow dividing circuit (28) that distributes the heat transfer tube group (30) through which the heat exchange water flows to a plurality of groups (G) and has different distribution ratios. ,
The flow rate of the heat exchange water of the first group (G1) having the minimum distribution ratio of the shunt circuit (28) and the second group (G2) of the shunt circuit (28) excluding the first group (G1). ) Is provided with a valve (33) that separately adjusts the flow rate of the heat exchange water.
When the heat transfer tube group (30) extends toward the airflow direction while meandering across the airflow direction of the air passing through the heat exchanger (20), and when viewed from the airflow direction, the first. A non-overlapping zone (F) in which the two groups (G2) and the first group (G1) do not overlap and only the second group (G2) is included, and the second group (G2) and the first group (G1). ) Are formed in a stacked manner, and the diversion circuit (28) is configured so that the overlapping zones are sandwiched between the non-overlapping zones (F).
The valve (33) is controlled so that the cold water is circulated to the first group (G1) of the shunt circuit (28) of the heat exchanger (20) and not to the second group (G2) during cooling. An air conditioner characterized by being provided with a control device (3). In the case of a low air conditioning load, the control device (3) increases or decreases the flow rate of the heat exchange water in the first group (G1) of the diversion circuit (28) to exchange heat with the heat exchanger (20). The temperature compensating unit (74) that constantly controls the temperature difference of the heat exchange water that occurs, the flow rate of the heat exchange water provided to the heat exchanger (20) of the air conditioner (5), and the heat exchanger. claim energy consumption monitoring unit which calculates and outputs the energy consumption of the object to be air-conditioned space (S) based on the temperature difference between the heat exchange water generated by heat exchange with (75), with the (20) The air conditioner according to 1. The control device (3) includes a plurality of heat source machines (10) for cooling or heating the heat exchange water provided in the heat exchanger (20) of the air conditioner (5) to adjust the water temperature. , A heat source control unit that outputs a signal that increases or decreases the number of operating units of the heat source machine (10) according to an increase or decrease in the energy consumption of the air-conditioned space (S) output by the energy consumption monitoring unit (75). The air conditioner according to claim 2, further comprising (76) . The air conditioner according to any one of claims 1 to 3, wherein the heat transfer tube group (30) of the heat exchanger (20) of the air conditioner (5) is formed of an elliptical tube .

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