JP2002039567A - Air conditioner and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling performance of a refrigerant heat exchange part which constitute air conditioner. SOLUTION: The air conditioner is provided with an air-conditioning heat exchange part for cooling gas to be air-conditioned, and a refrigerant heat exchange part for cooling a refrigerant with external air. Then, a drain being generated by the air-condoning heat exchange part is passed through drain piping 23 and is supplied from a header 24 to each piping 25. The end part of each piping 25 is dispersed and arranged at a cooling fin part 27 in the refrigerant heat exchange part 3, and the cooling fin part 27 is cooled by drain which is sprayed onto the part and its latent heat of vaporization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having an air conditioner heat exchanger for cooling gas to be air-conditioned, a refrigerant heat exchanger for cooling refrigerant, and a method of operating the air conditioner.

[0002]

2. Description of the Related Art Air conditioners are installed in many places, such as general offices, offices, stores, hospitals, schools, accommodation facilities, and homes. Each of these air conditioners is provided with an air conditioning heat exchange unit that cools gas to be air conditioned and a refrigerant heat exchange unit that cools refrigerant such as CFC substitute. One air conditioning heat exchange unit and one refrigerant heat exchange unit Various types of air conditioners are on the market, such as a package type combining parts and a multi type combining a plurality of air conditioning heat exchange units and one refrigerant heat exchange unit.

[0003] These air conditioners are broadly classified from a cooling system into a water-cooled type and an air-cooled type. The water-cooled type can make the temperature of the cooling water close to the dew point lower than the atmospheric temperature, and the heat transfer coefficient of the water can be considerably larger than that of air, so the cooling performance (COP) can be increased. Necessary and suitable for large air conditioners. On the other hand, the air-cooled type can easily perform the laying work without using a cooling tower and the like, and is widely used in relatively small air conditioners. However, the cooling performance of the air-cooled type is somewhat lower than that of the water-cooled type because the refrigerant is cooled at the outside air temperature. Therefore, as a measure for improving the cooling performance of the air-cooling type, a method has been proposed in which water is sprayed to a refrigerant heat exchange unit, and the refrigerant pipes and cooling fins are cooled by latent heat of vaporization of water droplets attached to the refrigerant fins.

FIG. 4 is a flowchart of an air-cooled air conditioner employing such a water spray system. The refrigerant discharged from the air conditioning heat exchange unit 1 is compressed and liquefied by the compressor 2, and the high temperature and high pressure refrigerant is cooled by the air cooling fan 4 in the refrigerant heat exchange unit 3. The liquid refrigerant discharged from the refrigerant heat exchange unit 3 is decompressed by adiabatic expansion at the expansion valve 5, and a part of the liquid refrigerant evaporates and returns to the air conditioning heat exchange unit 1 in a gas-liquid two-phase state. The refrigerant takes heat from the air sent by the air-conditioning fan 6 in the air-conditioning heat exchange unit 1, and the refrigerant itself is completely evaporated and vaporized by the received heat and returned to the compressor 2 again.

[0005] When the refrigerant and air exchange heat in the air-conditioning heat exchanging section 1, the moisture contained in the air is cooled below the dew point on the heat transfer surface and condenses. Condensation forms a drain and is collected in a drain collection unit 7, and then discharged to a drain 9 by a pump 8. On the other hand, the water sprayer 1
0 is provided, and water is sprayed by supplying water such as tap water supplied through the water supply pipe 11. The cooling fins are cooled by the cooling effect of the sprayed water and the latent heat of evaporation, and the cooling performance is enhanced.

[0006]

However, the conventional method of cooling the cooling fins with tap water or the like increases the cost of water supply and is economically disadvantageous. In addition, since the drain from the air conditioning heat exchange unit is also discharged as it is, the amount of water released to the drainage channel per air conditioner increases. Therefore, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a new air conditioner and a method for operating the same. Still another object of the present invention is to provide an air conditioner that can maintain the cooling performance of the refrigerant heat exchange unit even when the amount of drain discharged from the air conditioning heat exchange unit decreases.

It is a further object of the present invention to provide an air conditioner capable of efficiently distributing and supplying cooling water to cooling fin portions of a refrigerant heat exchanging portion to enhance its cooling performance. Still another object of the present invention is to provide an air conditioner in which the cooling performance does not greatly change due to a temperature change of the intake air in the refrigerant heat exchange unit. Still another object of the present invention is to provide an air conditioner in which the cooling performance of the refrigerant heat exchange unit is improved even in a system having a plurality of air conditioning heat exchange units.
Still another object of the present invention is to provide an operation method of an air conditioner that maintains a cooling performance by cleaning a cooling fin portion of a refrigerant heat exchange unit.

[0008]

An air conditioner according to the present invention for solving the above-mentioned problems has an air-conditioning heat exchanging section for cooling gas to be air-conditioned and an air-cooling type heat exchanging section for cooling the refrigerant with external air. In the air conditioner, the drain generated in the air conditioning heat exchange unit is configured to be introduced into the cooling fin unit of the refrigerant heat exchange unit (claim 1). In the air conditioner, a makeup water pipe for supplying makeup water may be provided, and the makeup water may be configured to be introduced into the cooling fin portion together with the drain or by being switched to the drain (claim 2).

In the air conditioner, it is possible to provide a drain container for collecting drain and a water level control device for adjusting a replenishing water amount such that the water level of the drain container is within a predetermined range. In the air conditioner, a drain or a header for receiving drain and makeup water can be provided, and ends of a plurality of pipes connected to the header can be dispersedly arranged in the cooling fin portion. In the air conditioner, a temperature control device that increases the amount of water introduced into the cooling fin unit according to the saturated vapor amount of water calculated from the intake air temperature in the refrigerant heat exchange unit can be provided.

[0010] In the air conditioner, a header comprising an open-type container for receiving drain or drain and makeup water is provided, and a plurality of pipe ends connected to the header are dispersedly arranged in a cooling fin section, and a cooling heat exchange section is provided. A temperature control device may be provided for adjusting the drain or the drain and make-up water amount so as to increase the water level of the container according to the square of the saturated vapor amount of water calculated from the intake air temperature. In the air conditioner, a plurality of air conditioners are provided,
Drains from a plurality of air conditioning heat exchange units can be configured to be introduced into one or a plurality of refrigerant heat exchange units.

According to another aspect of the present invention, there is provided a method of operating an air conditioner having an air conditioner heat exchanger for cooling gas to be air-conditioned and a refrigerant heat exchanger for cooling refrigerant with external air. It is. Then, the drain generated in the air conditioning heat exchange unit is introduced into the cooling fin unit of the refrigerant heat exchange unit, and a makeup water pipe for supplying makeup water is provided, and the makeup water is switched together with the drain or with the drain to change the cooling fin unit. (Claim 8). In the method of operating the air conditioner, a timer device that issues a cleaning command at a set cycle is provided, and the cooling fin portion can be cleaned by the cleaning command (claim 9).

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a flowchart showing one example of the air conditioner of the present invention, and the same parts as those in FIG. 4 are denoted by the same reference numerals. The air conditioner 20 basically includes an air conditioning heat exchange unit 1 having an air conditioning fan 6, a compressor 2, a refrigerant heat exchange unit 3 having an air cooling fan 4, and an expansion valve 5, as in the conventional example of FIG. In the configuration of this example, it is assumed that the air conditioning heat exchange unit 1 is installed in a normal room, and the refrigerant heat exchange unit 3 is installed in a relatively high place such as a rooftop.

The drain generated in the air-conditioning heat exchange unit 1 is collected in a drain container 21 disposed below the drain. A drain pipe 23 provided with the pump 8 and the flow rate measuring device 22 is connected to the bottom of the drain container 21, and a tip of the drain pipe 23 is connected to the header 24. A plurality of pipes 25 are branched and connected from the header 24, and the open ends of the respective pipes 25 are dispersedly arranged on cooling fins arranged in the refrigerant heat exchange unit 3. FIG. 2 shows a refrigerant pipe 2 disposed in a refrigerant heat exchange section 3.
FIG. 6 is a partial front view showing a cooling fin portion 6 in which a number of fins penetrating therethrough are arranged in parallel. The water flowing out of each pipe 25 is dispersed and supplied uniformly from above to the cooling fin portion 27, and is heated and evaporated by heat exchange while flowing down in a thin film along each fin of the cooling fin portion 27, and evaporates.
The cooling fin portion 27 (and the refrigerant tube 26) is cooled mainly by the latent heat of evaporation.

Referring again to FIG. 1, a supply pipe 28 for supplying makeup water such as tap water is connected to a drain pipe 23 close to the drain container 21, and the regulating valve 2 is connected to the makeup water pipe 28.
9 are provided. The supply water pipe 28 is connected to the drain pipe 2
Instead of connecting to the end 3, the end may be opened in the drain container 21. On the other hand, the regulating valve 30 is connected to the drain pipe 23.
And a water level measuring device 31 is provided in the drain container 21.
Is provided, and the measurement signal is input to the controller 32.
The controller 32 controls the drain container 2 by changing the drain discharge amount.
This is provided to keep the amount of water supplied to the refrigerant heat exchange unit 3 constant while preventing the water level of 1 from largely changing from a preset value. For example, when the water level of the drain container 21 falls below the set value, the controller 32 adjusts the drain adjustment valve 30 in a direction to throttle the opening, and adjusts the direction of opening the makeup water adjustment valve 29 so as to compensate for the reduced amount of water. . The makeup water pipe 28, the regulating valve 29, the regulating valve 30, the water level measuring device 31 and the controller 32 constitute a water level control device 33 of the drain container 21.

As the flow measuring device 22 for measuring the amount of water in the drain pipe 23, for example, a turbine type, float type or electromagnetic type flow meter can be used, and the measurement signal is input to the controller 34. The temperature of the intake air of the refrigerant heat exchange unit 3 is measured by the temperature measuring device 35, and the measurement signal is also transmitted to the controller 3
4 is input. The controller 34 controls the number of revolutions of the pump 8 to increase or decrease the amount of water introduced into the cooling fin unit 27 in accordance with the saturated vapor amount of water calculated from the intake air temperature of the refrigerant heat exchange unit 3. . The rotation speed of the pump 8 can be controlled by changing the rotation speed of the motor for driving the pump by thyristor control or the like. The controller 34 is provided with a flow rate setting unit, and is configured so that the set value of the flow rate setting unit changes with the measurement signal of the temperature measuring device 35 (that is, cascade control of the flow rate by temperature). For example, when the intake air temperature rises above a predetermined value, the flow rate set value is increased by the measurement signal to increase the rotation speed of the pump 8,
Conversely, when the intake air temperature falls below a predetermined value, the set value of the flow rate is reduced by the measurement signal, and the rotation speed of the pump 8 is reduced. The flow rate measuring device 22, the pump 8, the controller 34, and the temperature measuring device 35 constitute a temperature control device 36.

The amount of evaporated water is approximately G = QW (1-η)
Thus, the water amount may be proportional to the saturated steam amount W. Here, G: evaporation amount (Kg / h), Q: air volume (Kg
/ H), W: saturated vapor concentration (Kg / Kg), η: relative humidity. The reason why the drain water is transported to the vicinity of the refrigerant heat exchange unit 3 by the pump 8 is when the refrigerant heat exchange unit 3 is installed on a rooftop or the like. On the other hand, when it is installed on the ground, it is needless to say that the flow rate can be controlled by the valve using the water level difference between the drain container and the ground as a power source.

Next, the operation of the air conditioner of the present invention will be described with reference to the flowchart of FIG. As in the air conditioner described with reference to FIG. 4, the refrigerant discharged from the air conditioning heat exchange unit 1 is compressed by the compressor 2, and the high-temperature and high-pressure refrigerant is cooled and liquefied by the air-cooling fan 4 in the refrigerant heat exchange unit 3. The liquid refrigerant discharged from the refrigerant heat exchange unit 3 is adiabatically expanded by the expansion valve 5 and partially vaporized and vaporized, and returns to the air-conditioning heat exchange unit 1 as a low-temperature gas-liquid two-phase refrigerant. The refrigerant is the air conditioning heat exchange unit 1,
Heat is taken from the air sent by the air-conditioning fan 6, and the air itself is completely evaporated and vaporized by the received heat, and is guided to the compressor 2 again. Drain discharged from the air-conditioning heat exchange unit 1 is collected in a drain container 21 and sent to a header 24 via a drain pipe 23 by a pump 8. The drain that has flowed into the header 24 is uniformly distributed and supplied to the cooling fins 27 (FIG. 2) through the respective pipes 25, where it is heated and evaporated, and the latent heat of evaporation cools the cooling fins 27 more effectively. I do.

When the drain at a constant flow rate is supplied to the header 24 and the drain flow rate discharged from the air-conditioning heat exchange unit 1 decreases, the water level in the drain container 21 gradually decreases. Then, the controller 32 controls the regulating valve 30 in the direction of squeezing by the measurement signal from the water level measuring device 31, and
At the same time, the water level of 1 is recovered, and the flow rate to the header 24 is maintained at the set value by controlling the adjustment valve 29 in the opening direction. Conversely, when the drain flow rate discharged from the air conditioning heat exchange unit 1 increases, the water level of the drain container 21 gradually increases,
In response to the measurement signal from the water level measuring device 31, the controller 32 controls the opening direction of the regulating valve 30 to reduce the water level of the drain container 21, and controls the regulating valve 29 in the closing direction to similarly control the flow rate to the header 24. Is maintained at the set value.

When the intake air temperature of the refrigerant heat exchange section 3 rises above a set value, the flow rate set value of the controller 34 is raised by a measurement signal from the temperature measuring device 35, whereby the rotation speed of the pump 8 rises. As a result, the flow rate of the drain pipe 23 increases, so that the high cooling performance of the refrigerant heat exchange unit 3 is maintained.
Conversely, when the intake air temperature of the refrigerant heat exchange unit 3 falls below the set value, the controller 3
The flow set value of 4 is reduced, whereby the rotation speed of the pump 8 is reduced and the flow rate of the drain pipe 23 is reduced. In this way, the drain pipe 2 is controlled by the control operation of the controller 34.
When the flow rate of 3 changes, the water level of the drain vessel 21 is also affected, but the fluctuation of the water level is automatically controlled by the controller 32.

The make-up water supplied from the make-up water pipe 28 has the function of compensating for the fluctuation of the flow rate of the drain discharged from the air-conditioning heat exchange section 1 as described above, that is, the action of maintaining the cooling water in the refrigerant heat exchange section 3. Have. But make-up water pipe 2
The makeup water supplied from 8 can be used not only for cooling but also for cleaning the cooling fins 27 and the coolant pipe 26 of the coolant heat exchange unit 3. In this case, for example, a timer device 37 for issuing a cleaning command at a set cycle is provided, and the controller 32 controls the regulating valves 29 and 30 by the cleaning command, and the controller 34 controls the rotation speed of the pump 8. By controlling, the flow rate of the drain pipe 23 is increased to a value required for cleaning. If the capacity of the drain container 21 is large and the water level is high, the cleaning can be performed only by opening the regulating valve 30 and increasing the rotation speed of the pump 8 according to the cleaning command. In addition, when there is a possibility that the water level of the drain container 21 may drop due to the cleaning, the cleaning can be effectively performed by closing the adjusting valve 30 and opening the adjusting valve 29 widely by the cleaning command and increasing the rotation speed of the pump 8. Further, in some cases, it is also possible to carry out washing using an intermediate method thereof, that is, using both makeup water and drainage.

FIG. 3 shows a modification of the header 24 in FIG. The header 24 has a vertically long container main body 38 having a sufficient head length, a lid 39 for closing the upper part of the container main body 38, a communication pipe 40 penetrating through the lid 39 and opening to the outside, and a container main body 38. Drain tube 4 connected to the bottom of the
1 and an open container constituted by a drain valve 42 provided in the drain pipe 41 thereof. As in the example of FIG. 1, the drain pipe 23 provided with the pump 8 is provided in the header 24.
And a plurality of pipes 25 are connected, and the open ends of the respective pipes 25 are distributed and arranged on the cooling fin portions 27 of the refrigerant heat exchange unit 3. However, in this example, the flow rate measuring device 22 in the drain pipe 23 is omitted. The header 24 is provided with a water level measuring device 43, and the measurement signal is input to the controller 34. As in the example of FIG. 1, a measurement signal of a temperature measuring device 35 that measures the temperature of the intake air 44 of the refrigerant heat exchange unit 3 is also input to the controller 34. The water level measuring device 43, the pump 8, the controller 34, and the temperature measuring device 35 constitute a temperature control device 36.

Header 2 comprising such an open container
The amount of water flowing out from each of the pipes 4 to each pipe 25 is proportional to the water level of the open container, that is, the square root of the water level difference between the water outlet of the container body 38 and the pipe 25 when the flow resistance of the pipe 25 is constant. Therefore, the amount of cooling water supplied to the cooling fin portion 27 can be increased or decreased by adjusting the water level of the container body 38. The amount of water that can be evaporated is approximately G = QW
It is represented by (1−η). Here, Q: air volume (Kg /
h), W: saturated vapor concentration (Kg / Kg), η: relative humidity. Further, since the amount of water is represented by G = K√H, K: proportionality constant, and H: water level difference, the water level difference is H = Q ² W ² (1-η).
² / K ² , which is the square of the saturated vapor amount. Controller 34
1 operates in such a manner as to keep the cooling performance of the refrigerant heat exchange unit 3 constant without being affected by the fluctuation of the intake air temperature, as in the example of FIG. That is, the flow rate of the drain flowing into the container main body 38 from the drain pipe 23 or the flow rate of the drain and the makeup water is adjusted so that the level of the drain or the drain and the makeup water is increased or decreased according to the intake air temperature of the refrigerant heat exchange unit 3. The controller 34 is provided with a water level setting unit, and is configured so that the set value of the water level setting unit changes with the measurement signal of the temperature measuring device 35 (that is, the water level is controlled by the temperature).

For example, when the intake air temperature of the refrigerant heat exchange section 3 rises above a set value, the water level set value of the controller 34 is raised by the measurement signal from the temperature measuring device 35, and the rotation speed of the pump 8 is raised. Thereby, the flow rate of the drain pipe 23 increases and the water level rises, and the cooling performance of the refrigerant heat exchange unit 3 is maintained in a predetermined range. Conversely, when the intake air temperature of the refrigerant heat exchange unit 3 drops below the set value, the water level set value of the controller 34 is lowered by the measurement signal from the temperature measuring device 35, and the rotation speed of the pump 8 is lowered. Drain piping 23
, The water level decreases, and the cooling performance of the refrigerant heat exchange unit 3 is maintained within a predetermined range.

[0024]

As described above, the air conditioner of the present invention is characterized in that the drain generated in the air conditioning heat exchange section is configured to be introduced into the cooling fin section of the refrigerant heat exchange section.
The cooling performance of the refrigerant heat exchange section can be improved while suppressing the water supply cost, and the amount of water released to the drain can be reduced.
In the air conditioner of the present invention, a makeup water pipe for supplying makeup water can be provided, and the makeup water can be introduced into the cooling fin portion together with the drain or by switching between the drain and the drain. Even when the amount of drain discharged from the exchange section decreases, high cooling performance of the refrigerant heat exchange section can be maintained.

In the air conditioner of the present invention, a drain container for collecting drain can be provided, and a water level control device for adjusting the amount of makeup water so that the water level of the drain container is within a predetermined range can be provided. The heat exchange section can be cooled. In the air conditioner of the present invention, a drain or a header for receiving drain and makeup water can be provided, and a plurality of pipe ends connected to the header can be dispersedly arranged in the cooling fin portion, whereby the drain and the like can be efficiently cooled. The cooling performance can be enhanced by dispersing and supplying the cooling water to the cooling section. In the air conditioner of the present invention, it is possible to provide a temperature control device that increases the amount of water introduced into the cooling fins in accordance with the amount of saturated steam of water calculated from the intake air temperature in the refrigerant heat exchange unit. , The high cooling performance of the refrigerant heat exchange section can be maintained.

In the air conditioner of the present invention, a header comprising a drain or an open-type container for receiving drain and make-up water is provided, and a plurality of pipe ends connected to the header are dispersedly arranged in the cooling fin portion, and the refrigerant heat exchange is performed. It is possible to provide a drain or a temperature control device for adjusting the drain and the makeup water amount so as to increase the water level of the container in accordance with the square of the saturated vapor amount of water calculated from the intake air temperature in the section. As a result, drain and the like can be efficiently distributed and supplied to the cooling fin portions, and high cooling performance of the refrigerant heat exchange portion can be maintained even if the intake air temperature fluctuates. In the air conditioner of the present invention, a plurality of air conditioners can be provided, and the drain from the plurality of air conditioner heat exchanging units can be introduced into one or more refrigerant heat exchanging units. Even in a system provided with a heat exchange unit, the cooling performance of the refrigerant heat exchange unit can be efficiently increased.

According to the method for operating an air conditioner of the present invention, a drain generated in an air conditioning heat exchange section is introduced into a cooling fin section of a refrigerant heat exchange section, and a makeup water pipe for supplying makeup water is provided.
Since the makeup water is used together with the drain or switched to the drain to wash the cooling fins,
High cooling performance can be maintained by washing the cooling fins of the refrigerant heat exchange unit. The operation method of the air conditioner according to the present invention is provided with a timer device that issues a cleaning command at a set cycle, and the cooling fin portion can be cleaned by the cleaning command, whereby the cooling fin portion of the refrigerant heat exchange unit can be surely provided. Can be washed.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one example of an air conditioner of the present invention.

FIG. 2 is a partial front view showing a refrigerant tube 26 arranged in the refrigerant heat exchange unit 3 in FIG. 1 and a cooling fin unit 27 in which a number of fins penetrating therethrough are arranged in parallel.

FIG. 3 is a partial flowchart showing a modification of the header 24 in FIG. 1;

FIG. 4 is a flowchart of a conventional air-cooled air conditioner employing a water spray method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air-conditioning heat exchange part 2 Compressor 3 Refrigerant heat exchange part 4 Air-cooling fan 5 Expansion valve 6 Air-conditioning fan 7 Drain collection part 8 Pump 9 Drainage groove 10 Water sprayer 11 Water supply pipe 20 Air conditioner 21 Drain container 22 Flow meter 23 Drain pipe 24 Header 25 Pipe 26 Refrigerant pipe 27 Cooling fin part 28 Make-up water pipe 29 Adjusting valve 30 Adjusting valve 31 Water level measuring device 32 Controller 33 Water level control device 34 Controller 35 Temperature measuring device 36 Temperature control device 37 Timer device 38 Container body 39 Cover Body 40 Communication pipe 41 Drain pipe 42 Drain valve 43 Water level measuring device 44 Intake

Claims (9)

[Claims] 1. An air conditioner having an air conditioning heat exchange unit 1 for cooling a gas to be air-conditioned and a refrigerant heat exchange unit 3 for cooling a refrigerant with external air, a drain generated in the air conditioning heat exchange unit 1 is a refrigerant heat exchange unit. An air conditioner characterized by being configured to be introduced into the cooling fin section 27 of the section 3. 2. The air conditioner according to claim 1, wherein a makeup water pipe for supplying makeup water is provided, and the makeup water is introduced into the cooling fin section 27 together with the drain or switched to the drain. apparatus. 3. The air conditioner according to claim 2, further comprising a drain container for collecting the drain, and a water level control device for adjusting a replenishing water amount such that the water level of the drain container is within a predetermined range. 4. A header according to claim 1, wherein a drain or a header for receiving the drain and make-up water is provided, and ends of the plurality of pipes connected to the header are dispersedly arranged in the cooling fin portion. An air conditioner according to any one of the above. 5. A temperature control device for increasing an amount of water introduced into the cooling fin unit according to a saturated vapor amount of water calculated from an intake air temperature in the refrigerant heat exchange unit. An air conditioner according to any one of the above. 6. A header 24 comprising an open-type container for receiving drain or drain and make-up water is provided, and ends of a plurality of pipes 25 connected to the header 24 are dispersedly arranged in a cooling fin portion 27, and a refrigerant heat A temperature controller (36) for adjusting a drain or a drain and a makeup water amount so as to increase a water level of the container according to a square of a saturated vapor amount of water calculated from an intake air temperature in the exchange unit (3).
An air conditioner according to claim 3. 7. The air conditioner according to claim 1, wherein a plurality of air conditioners are provided, and drains from the plurality of air conditioner heat exchangers are introduced into one or more refrigerant heat exchangers. An air conditioner according to any one of the above. 8. An operation method of an air conditioner having an air conditioning heat exchange unit 1 for cooling a gas to be air-conditioned and a refrigerant heat exchange unit 3 for cooling a refrigerant with external air, wherein a drain generated in the air conditioning heat exchange unit 1 is discharged. A replenishing water pipe 28 for supplying the replenishing water is provided while being introduced into the cooling fin portion 27 of the refrigerant heat exchanging unit 3.
A method for operating an air conditioner, wherein the makeup water is used together with the drain or switched to the drain to wash the cooling fin portion 27. 9. A timer device 37 for issuing a cleaning command at a set cycle is provided.
The method for operating an air conditioner according to claim 8, wherein the air conditioner is cleaned.