KR102342487B1 - Air conditioner and control method thereof - Google Patents

Abstract

The present invention relates to an air conditioner and a method for controlling the same. In the air conditioner, a case disposed in a predetermined space in the air conditioner, a condenser installed inside the case, a cooling water pipe through which cooling water that exchanges heat with a refrigerant flowing in the condenser flows, and the cooling water pipe to supply the cooling water The supply cooling water pipe connected to one side, the flow rate control valve to control the flow rate of the cooling water, the flow rate control valve installed in the supply cooling water pipe, and the condenser to maintain an appropriate condensing temperature within a predetermined range by controlling the flow rate control valve a control unit controlling the flow rate of the cooling water; is included, and the appropriate condensing temperature is determined as the condensing temperature value in which the sum of the water usage fee generated by the use of the cooling water and the electricity usage fee generated by the flow of the refrigerant is the smallest.

Description

Air conditioner and its control method

The present invention relates to an air conditioner and a method for controlling the same.

In general, an air conditioner is a device that cools or purifies air in a room by using a refrigerant cycle consisting of a compressor, a condenser, an expansion mechanism, and an evaporator in order to create a more comfortable indoor environment for users.

The compressor compresses the refrigerant and discharges it in a gaseous state of high temperature and pressure, and the discharged refrigerant is converted into a liquid state of high temperature and high pressure through heat exchange with the outside in the condenser. In addition, the expansion mechanism discharges a high-temperature, high-pressure liquid refrigerant into a low-temperature and low-pressure liquid state, and the discharged refrigerant is converted into a gaseous state in the evaporator and flows to the compressor.

At this time, according to the cooling method of the condenser, the air conditioner is an air cooling type that cools the refrigerant through heat exchange between the condenser and external air, and a water cooling type that cools the refrigerant through heat exchange between the condenser and the cooling water supplied from the outside. are separated

Compared with the air-cooled air conditioner, the water-cooled air conditioner has the advantages of high heat exchange efficiency and a high degree of freedom in installation. However, the water-cooled air conditioner has a problem in that, when the condition of the cooling water supplied from the outside is changed, the operating conditions are changed accordingly and the efficiency is lowered.

In order to solve this problem, the following prior literature has been disclosed.

(1) 1st Prior Document: Registered Patent No. 10-0826926 (April 25, 2008), water-cooled air conditioner and its control method

The first prior art determines whether the current cycle formed according to the supply water temperature is appropriate by measuring the condenser outlet temperature of the cooling water temperature. At this time, when it is determined that the proper cycle is not maintained, uniform performance can always be ensured despite fluctuations in the supply water temperature by controlling the speed of the compressor by setting the suction pressure of the refrigeration cycle differently.

(2) 2nd Prior Document: Registered Patent No. 10-1392856 (April 30, 2014), cooling and heating device without outdoor unit having a water-cooled heat exchange structure

The second prior document is a compressor, a first and second heat exchanger serving as a condenser, heating through a capillary tube serving as an evaporator, a compressor, a third heat exchanger through which cooling water is circulated, an expansion valve and an evaporator Cooling is performed through the first heat exchanger serving as Accordingly, the outdoor unit is provided so that cooling and heating operations are possible by water cooling without the need.

However, such prior documents have a problem in that excessive electricity and water charges are generated by cooling the condenser using a fixed amount of cooling water regardless of other conditions.

In addition, since the fixed amount of cooling water does not sufficiently cool the condenser, there is a problem in that the condensation efficiency is lowered and the efficiency of the air conditioner is lowered as a whole.

It is an object of the present invention to provide an air conditioner having a condenser having a predetermined condensing temperature by controlling the flow rate of supplied cooling water.

Another object of the present invention is to provide an air conditioner that is operated according to the condensation temperature by determining the condensing temperature at which electricity and water usage charges are minimized, and a method for controlling the same.

In the air conditioner according to the present invention, a case disposed in a predetermined space, a condenser installed inside the case, a cooling water pipe through which cooling water that exchanges heat with a refrigerant flowing in the condenser flows, and the cooling water to supply the cooling water A supply cooling water pipe connected to one side of the pipe, a flow rate control valve installed in the supply cooling water pipe to control the flow rate of the cooling water, and a flow rate control valve to maintain the condenser at an appropriate condensing temperature having a predetermined range; a control unit controlling the flow rate of the cooling water; is included, and the appropriate condensing temperature is determined as the condensing temperature value in which the sum of the water usage fee generated by the use of the cooling water and the electricity usage fee generated by the flow of the refrigerant is the smallest.

The controller may decrease the opening degree of the flow control valve when the condensing temperature is smaller than the appropriate condensing temperature, and increase the opening degree of the flow control valve when the condensing temperature is higher than the appropriate condensing temperature.

The appropriate condensing temperature may be determined as a condensing temperature value in which the sum of the water usage fee and the electricity usage fee is the smallest when the temperature of the predetermined space and the temperature of the cooling water are fixed and the flow rate of the cooling water is changed. .

The condenser may be disposed inside the cooling water pipe, and the refrigerant flowing in the condenser may exchange heat with the cooling water flowing outside the condenser.

The predetermined space may include a kitchen equipped with a refrigerator, and the case may be disposed above the refrigerator.

A compressor, an evaporator, and an expander installed inside the case to form one refrigerant cycle with the condenser may be further included, and the evaporator may be provided to exchange heat with indoor air existing in the predetermined space.

Further, in the control method of the air conditioner according to the spirit of the present invention, in the control method of the air conditioner including a condenser that exchanges heat with cooling water, the condensing temperature of the condenser is measured, and the condensing temperature corresponds to an appropriate condensing temperature. determines whether or not, and when the condensing temperature corresponds to the appropriate condensing temperature, maintains the flow rate of the cooling water, and when the condensing temperature does not correspond to the appropriate condensing temperature, adjusts the flow rate to adjust the flow rate of the cooling water The opening degree of the valve can be controlled.

The appropriate condensing temperature may correspond to a temperature value above the minimum allowable condensing temperature and below the maximum allowable condensing temperature.

When the condensing temperature is lower than the minimum allowable condensing temperature, the flow rate of the cooling water is reduced by reducing the opening degree of the flow control valve, and when the condensing temperature is higher than the maximum allowable condensing temperature, the opening degree of the flow control valve is It is possible to increase the flow rate of the cooling water by increasing it.

In the air conditioner and the control method of the air conditioner according to the embodiment of the present invention, the following effects can be expected.

By controlling the flow rate of the supplied cooling water, the condenser can be maintained at an appropriate condensing temperature, and accordingly, the air conditioner can be operated stably.

In particular, since the appropriate condensing temperature is determined as a condensing temperature value at which electricity and water charges are minimized, there is an advantage in that the operation cost of the air conditioner can be reduced and convenience of use can be provided to the user.

In addition, since it is controlled based on the appropriate condensing temperature, it has the advantage of being able to properly respond to changes in the temperature of the cooling water supplied from the outside or changes in the conditions of the internal cycle.

In addition, the air conditioner according to the spirit of the present invention is a device for cooling a relatively small space, and has a relatively large degree of freedom in installation, and has advantages in that there is no device that is provided integrally and disposed in a separate outdoor space.

1 is a view showing an installation place of an air conditioner according to an embodiment of the present invention.
2 is a diagram schematically illustrating the configuration of an air conditioner according to an embodiment of the present invention.
3 is a diagram illustrating a control structure of an air conditioner according to an embodiment of the present invention.
4 is a diagram illustrating a control flow of an air conditioner according to an embodiment of the present invention.
5 is a view showing data for determining the condensation temperature of the air conditioner according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the spirit of the present invention is not limited to the presented embodiments, and those skilled in the art who understand the spirit of the present invention will be able to easily suggest other embodiments within the scope of the same spirit.

1 is a view showing an installation place of an air conditioner according to an embodiment of the present invention. 1 illustrates a kitchen, which is one of installation places of an air conditioner according to an embodiment of the present invention.

As shown in FIG. 1 , various kitchen furniture may be installed in the kitchen. For example, in the kitchen, a refrigerator 10 , an oven 12 , a gas stove 14 , a microwave oven 16 , and a plurality of storage boxes 18 may be provided. The shape and function of each kitchen furniture are general and are not related to the embodiment of the present invention, and detailed description thereof will be omitted.

In general, the kitchen can cook the food cooling water using the various kitchen furniture. In particular, when cooking food coolant using the gas stove 14 , a relatively large amount of heat, gas, smoke, etc. may be generated.

Accordingly, the temperature may be relatively increased only in the kitchen among the entire space, such as a home in which the kitchen is provided. At this time, since it is inefficient to cool the entire space, a device for cooling a predetermined space such as the kitchen is required.

Accordingly, the air conditioner 100 according to an embodiment of the present invention may be installed in a predetermined space such as the kitchen. That is, it can be understood that the air conditioner 100 according to the spirit of the present invention is for cooling a relatively small space. As described above, the air conditioner 100 disposed in the kitchen is exemplary, and the air conditioner 100 may be disposed in various spaces.

In particular, as shown in FIG. 1 , the air conditioner 100 may be disposed above the refrigerator 10 . This is because cooling at a high place is efficient due to the characteristics of cold air, and the location of the air conditioner 100 is not limited thereto.

The air conditioner 100 includes a case 110 forming an exterior, and at least one inlet 114 and an outlet 112 formed in the case 110 . As shown in FIG. 1 , the case 110 may be provided in a substantially flat box shape. In this case, the bottom surface of the case 110 may be provided to correspond to the upper surface of the refrigerator 10 , and may be provided to be flat to be stably seated on the refrigerator 10 .

The suction port 114 may be opened and formed on one side surface of the case 110 . In addition, the discharge port 112 may be provided on the front surface of the case 110 to be able to open and close. For example, the discharge port 112 may be opened and closed by a rotatably provided vane 116 .

The positions and shapes of the inlet 114 and the outlet 112 and the shape of the case 110 are exemplary, and the air conditioner 100 may be formed to have various appearances.

Hereinafter, the internal configuration of the air conditioner 100 will be described in detail.

2 is a diagram schematically illustrating the configuration of an air conditioner according to an embodiment of the present invention. In FIG. 2 , for convenience of explanation, the configuration of the air conditioner 100 is not shown as each device installed inside the case 110 , but a refrigerant cycle connected through a refrigerant pipe.

As shown in FIG. 2 , in the air conditioner 100 according to the embodiment of the present invention, a compressor 120 , a condenser 150 , an expander 140 and an evaporator 130 are provided, and each configuration is It is connected to the refrigerant pipe. This shows only the main configuration, and in addition to the above configuration, various configurations may be added.

The compressor 120 is configured to compress and discharge the gaseous refrigerant in a high-temperature and high-pressure state. At this time, although one compressor 120 is illustrated in FIG. 2 , a plurality of compressors 120 connected in parallel or in series may be provided. In addition, the compressor 120 may be provided in various shapes and compression types.

In addition, a gas-liquid separator (not shown) provided to separate the gaseous refrigerant before flowing into the compressor 120 may be provided in the refrigerant pipe flowing into the compressor 120 . Accordingly, the separated gaseous refrigerant may be introduced into the compressor 120 .

In addition, an oil separator (not shown) for separating oil from the refrigerant discharged from the compressor 120 may be provided in the refrigerant pipe discharged from the compressor 120 .

The condenser 150 is configured to condense the high-temperature and high-pressure gas refrigerant discharged from the compressor 120 into a liquid. At this time, the condenser 150 is provided in the form of a refrigerant pipe through which the refrigerant flows. In particular, as shown in FIG. 2 , the condenser 150 may be bent.

The condenser 120 of the air conditioner 100 according to the spirit of the present invention condenses the refrigerant by exchanging the refrigerant with water flowing in from the outside. That is, the condenser 150 is disposed to exchange heat with the cooling water pipe 160 through which the water flowing from the outside, that is, the cooling water flows.

In particular, as shown in FIG. 2 , the condenser 150 through which the refrigerant flows may be disposed inside the cooling water pipe 160 to be provided in the form of a double pipe. That is, cooling water flows to the outside of the condenser 150 , and heat is emitted from the condenser 150 to the cooling water pipe 160 . Accordingly, the gas refrigerant flowing through the condenser 150 may be condensed into a liquid refrigerant.

The cooling water pipe 160 may be connected to a supply cooling water pipe 162 through which cooling water is supplied from the outside and a recovery cooling water pipe 164 through which the heat-exchanged cooling water is discharged to the outside. That is, the cooling water introduced through the supply cooling water pipe 162 receives heat from the cooling water pipe 160 and is discharged to the recovery cooling water pipe 164 .

In this case, the coolant flowing in from the outside may correspond to water stored in the water storage tank, groundwater, or the like.

In addition, a flow rate control valve 166 may be installed in the supply cooling water pipe 162 to control the amount of cooling water introduced therein. The flow control valve 166 is provided as a valve that can control the opening degree, for example, it may be provided as an electronic expansion valve (EEV, Electronic Expansion Valve). The control of the flow control valve 166 will be described in detail with reference to FIGS. 3 and 4 to be described later.

In addition, a water level sensor and the like may be provided in the cooling water pipe 160 , and various valves such as a one-way valve or various sensors may be mounted in the supply cooling water pipe 162 and the return cooling water pipe 166 .

The expansion device 140 is configured to expand the liquid refrigerant in a high temperature and high pressure state condensed in the condenser 150 into a liquid refrigerant in a low pressure state. For example, the expansion device 140 may include an electronic expansion valve.

The evaporator 130 is configured to evaporate the liquid refrigerant flowing in the expansion device 140 into a gas. In this case, the evaporator 130 may be provided in the form of a heat exchanger that exchanges heat with external air. For example, the evaporator 130 is provided in the form of a refrigerant pipe through which the refrigerant flows.

In addition, in the air conditioner 100 according to an embodiment of the present invention, the evaporator 130 provides power to the blower fan 132 and the blower fan 132 for forced convection of air so that heat exchange with the outside air is provided. A fan motor 134 may be provided.

An operation of the air conditioner 100 according to an embodiment of the present invention will be briefly described with reference to FIG. 2 .

When the air conditioner 100 is operated, the compressor 120 compresses the refrigerant and discharges it to the condenser 150 . The refrigerant discharged from the compressor 120 flows in the condenser 150 and is condensed by heat exchange with the cooling water.

The condensed refrigerant is expanded in the expansion device 140 and flows to the evaporator 130 , and the refrigerant flowing through the evaporator 130 is evaporated by heat exchange with internal air existing in a predetermined space such as the kitchen described above. . The refrigerant discharged from the evaporator 130 is returned to the compressor 120 again to repeat the flow.

In the process in which the evaporator 130 exchanges heat with the internal air, the internal air loses heat to the evaporator 130 to lower the temperature. That is, the internal air introduced into the interior of the case 110 through the suction port 114 is heat-exchanged with the evaporator 130 and flows into a predetermined space through the discharge port 112 in a state in which the temperature is lowered.

Through this process, the air conditioner 100 may supply air having a lowered temperature to the predetermined space and cool the predetermined space. Hereinafter, the control of the air conditioner 100 will be described in detail.

3 is a diagram illustrating a control structure of an air conditioner according to an embodiment of the present invention.

As shown in FIG. 3 , the air conditioner 100 according to the spirit of the present invention includes a control unit 170 that controls various configurations described above. The control unit 170 may control the compressor 120 , the blower fan 132 , the flow rate control valve 166 , and the like.

In addition, the air conditioner 100 may be provided with a power supply unit 180 . The power supply unit 180 may be provided in a form in which a user can input a desired set temperature. For example, the power supply unit 180 may be provided in the form of a remote control that remotely transmits a signal to the control unit 170 .

In addition, the air conditioner 100 may be provided in the form of transmitting a signal to the control unit 170 when the detected indoor temperature is greater than or equal to a reference value by sensing the indoor temperature, not the signal from the power supply 180 . . In this case, the air conditioner 100 may be provided with a temperature sensor for detecting the indoor temperature.

As such, when a signal is input to the control unit 170 , the control unit 170 may operate the compressor 120 . In detail, a signal for applying power to the compressor 120 may be transmitted. Accordingly, the compressor 120 operates and the refrigerant circulates in the cycle described above.

Also, the control unit 170 may operate the blowing fan 132 . In detail, a signal for applying power to the fan motor 134 providing power to the blowing fan 132 may be transmitted. Accordingly, the blowing fan 132 is rotated and the indoor air is forced convection.

The control unit 170 may operate the blower fan 132 as necessary to simply convection indoor air. In addition, the air volume of the blowing fan 132 may be adjusted or the operation of the compressor 120 may be adjusted.

Also, the control unit 170 may receive information about the condensing temperature Tc from the condenser 150 . At this time, the condenser 150 may be provided with a sensor for detecting the condensation temperature (Tc). In addition, the condensing temperature Tc may be calculated through the pressure of the refrigerant flowing through the condenser 150 .

The control unit 170 may adjust the opening degree of the flow rate control valve 166 according to the received condensing temperature Tc. Hereinafter, this will be described in detail.

4 is a view showing a control flow of the air conditioner according to an embodiment of the present invention.

As shown in FIG. 4 , the condensing temperature Tc is measured in the condenser 150 ( 200 ). This may be measured after a predetermined time elapses after the air conditioner 100 is operated or may be measured simultaneously with the operation of the air conditioner 100 . In addition, during the operation of the air conditioner 100, the measurement may be continuously performed at a predetermined interval.

Information on the measured condensing temperature Tc is transmitted to the control unit 170, and the control unit 170 determines whether the received condensing temperature Tc is smaller than A (210). At this time, A corresponds to a predetermined temperature value, hereinafter referred to as a 'minimum allowable condensing temperature'. For example, the minimum allowable condensing temperature (A) may be 44 degrees.

When the condensing temperature (Tc) is less than the minimum allowable condensing temperature (A), the control unit 170 decreases the opening degree of the flow control valve 166 (240). When the opening degree of the flow control valve 166 is decreased, the flow rate of the cooling water passing through the supply cooling water pipe 162 is decreased (250).

Accordingly, the cooling water flowing into the cooling water pipe 160 decreases, the amount of heat exchange between the condenser 150 and the cooling water pipe 160 decreases, and the condensing temperature Tc of the condenser 150 may increase. .

In addition, when the condensing temperature (Tc) is equal to or greater than the minimum allowable condensing temperature (A), the control unit 170 determines whether the condensing temperature (Tc) is greater than B ( 220 ). At this time, B corresponds to a predetermined temperature value, hereinafter referred to as 'maximum allowable condensation temperature'. For example, the maximum allowable condensing temperature (B) may be 46 degrees.

When the condensing temperature Tc is greater than the maximum allowable condensing temperature B, the control unit 170 increases the opening degree of the flow rate control valve 166 (260). When the opening degree of the flow control valve 166 is increased, the flow rate of the cooling water passing through the supply cooling water pipe 162 is increased (250).

Accordingly, the cooling water flowing into the cooling water pipe 160 increases, the amount of heat exchange between the condenser 150 and the cooling water pipe 160 increases, and the condensing temperature Tc of the condenser 150 may decrease. .

In addition, when the condensing temperature Tc is less than or equal to the maximum allowable condensing temperature B, the control unit 170 determines that the condensing temperature Tc corresponds to an 'appropriate condensing temperature'. Accordingly, the opening degree of the flow control valve 160 is maintained (230), and the flow rate and heat exchange amount are maintained.

In summary, the control unit 170 determines whether the condenser 150 has an appropriate condensing temperature corresponding to a value equal to or greater than the minimum allowable condensing temperature (A) and less than or equal to the maximum allowable condensing temperature (B).

At this time, in the sequence shown in FIG. 4 and described above, the minimum allowable condensing temperature (A) is first determined, and the maximum allowable condensing temperature (B) is determined later, but this is exemplary. For example, whether the measured condensing temperature (Tc) corresponds to the appropriate condensing temperature may be determined at the same time.

In addition, when the measured condensing temperature Tc corresponds to an appropriate condensing temperature, the control unit 170 maintains the opening degree of the flow rate control valve 166 . On the other hand, when the measured condensing temperature Tc does not correspond to the appropriate condensing temperature, the control unit 170 adjusts the flow rate by adjusting the opening degree of the flow rate control valve 166 .

For example, a case in which the minimum allowable condensing temperature (A) is 44 degrees and the maximum allowable condensing temperature (B) is 46 degrees will be described. When the measured condensing temperature Tc is 45 degrees, the control unit 170 determines that the flow rate of the cooling water is appropriate because the condensing temperature Tc corresponds to an appropriate condensing temperature.

On the other hand, when the measured condensing temperature Tc is 43 degrees, the control unit 170 determines that the condensing temperature Tc is low and reduces the flow rate. As the flow rate decreases, the amount of heat exchange may decrease and the condensation temperature Tc may increase.

In addition, when the measured condensing temperature Tc is 47 degrees, the control unit 170 determines that the condensing temperature Tc is high and increases the flow rate. As the flow rate increases, the amount of heat exchange may increase and the condensation temperature Tc may decrease.

As such, the control unit 170 of the air conditioner 100 according to the spirit of the present invention can adjust the condensing temperature Tc of the condenser 150 by adjusting the opening degree of the flow rate control valve 166 .

That is, it is possible to appropriately respond to the nature of the coolant flowing in from the outside. For example, when the temperature of the cooling water increases as the external temperature increases, the condensation temperature Tc may increase accordingly. At this time, it is possible to detect this and increase the flow rate of the cooling water to properly maintain the condensing temperature (Tc).

In addition, since the condensing temperature Tc is measured and controlled, it is possible to appropriately respond to changes in the refrigerant cycle itself as well as changes in the properties of the coolant flowing in from the outside.

At this time, the range of the appropriate condensing temperature having a value equal to or greater than the minimum allowable condensing temperature (A) and less than or equal to the maximum allowable condensing temperature (B) may be determined as follows.

5 is a view showing data for determining the condensation temperature of the air conditioner according to an embodiment of the present invention. 5 corresponds to a table in which the condensed temperature change is measured by changing the cooling water flow rate, and the indoor temperature and the cooling water temperature correspond to values measured by fixing at 27 degrees.

As shown in FIG. 5 , it can be seen that when the flow rate of the cooling water is increased, the condensing temperature Tc is lowered. This is a natural result because, as described above, the amount of heat exchange increases when the flow rate of the cooling water is increased.

At this time, it can be seen that as the condensation temperature (Tc) is lowered, the electricity usage fee is reduced. The electricity usage rate means a value added based on the operation of the air conditioner 100 for 4 hours a day.

On the other hand, it can be seen that the water consumption rate increases because the flow rate of the cooling water increases. The water usage fee means a value added based on the operation of the air conditioner 100 for 4 hours a day.

That is, as the condensing temperature Tc decreases, the electricity usage rate decreases, but the water usage rate increases. In addition, as the condensing temperature Tc increases, the electricity usage rate increases, but the water usage rate decreases.

A case in which the sum of the electricity usage fee and the water usage fee is the smallest may be determined as an appropriate condensing temperature. In FIG. 5 , it can be seen that the total additional charge is the smallest when the condensation temperature is 44.6 degrees. Accordingly, by determining an appropriate region, the minimum allowable condensing temperature (A) and the maximum allowable condensing temperature (B) can be determined and controlled as described above.

The values shown in FIG. 5 are exemplary values according to measurement and may be provided differently. The appropriate condensing temperature determined as described above is a value in consideration of both the electricity usage fee and the water usage fee, and the user can effectively use the air conditioner 100 according to the spirit of the present invention.

100: air conditioner 120: compressor
130: evaporator 140: expansion device
150: condenser 160: cooling water pipe
162: supply cooling water pipe 164: recovery cooling water pipe
166: flow control valve 170: control unit

Claims (9)

a case disposed in a predetermined space;
a condenser installed inside the case;
a cooling water pipe through which cooling water that exchanges heat with the refrigerant flowing through the condenser flows;
a supply cooling water pipe connected to one side of the cooling water pipe to supply the cooling water;
a flow rate control valve installed in the supply cooling water pipe to control the flow rate of the cooling water; and
a control unit for controlling the flow rate of the cooling water by controlling the flow rate control valve so that the condenser is maintained at an appropriate condensing temperature having a predetermined range; is included,
The appropriate condensing temperature is,
fixing the temperature of the predetermined space and the temperature of the cooling water,
When the flow rate of the cooling water is changed, the sum of the water usage fee generated by the use of the cooling water and the electricity usage fee generated by the flow of the refrigerant is determined as the smallest condensing temperature value. The method of claim 1,
The control unit is
When the condensing temperature is smaller than the appropriate condensing temperature, the opening degree of the flow control valve is reduced,
When the condensing temperature is higher than the appropriate condensing temperature, the air conditioner characterized in that the opening degree of the flow control valve is increased. delete The method of claim 1,
The condenser is disposed inside the cooling water pipe, and the refrigerant flowing in the condenser exchanges heat with the cooling water flowing outside the condenser. The method of claim 1,
The predetermined space includes a kitchen equipped with a refrigerator,
The case is an air conditioner, characterized in that it is disposed on the upper portion of the refrigerator. The method of claim 1,
A compressor, an evaporator and an expander installed inside the case to form one refrigerant cycle with the condenser are further included,
The evaporator is an air conditioner, wherein the evaporator is provided to exchange heat with indoor air existing in the predetermined space. An air conditioner control method comprising: a case disposed in a predetermined space; and a condenser installed inside the case, through which a refrigerant flows, and heat-exchanges with cooling water,
Measuring the condensation temperature of the condenser,
It is determined whether the condensing temperature corresponds to an appropriate condensing temperature,
When the condensing temperature corresponds to the appropriate condensing temperature, maintaining the flow rate of the cooling water,
When the condensing temperature does not correspond to the appropriate condensing temperature, controlling the opening degree of the flow control valve to adjust the flow rate of the cooling water,
The appropriate condensing temperature is,
fixing the temperature of the predetermined space and the temperature of the cooling water,
When the flow rate of the cooling water is changed, the sum of the water usage fee generated by the use of the cooling water and the electricity usage fee generated by the flow of the refrigerant is determined as the smallest condensing temperature value. Way. 8. The method of claim 7,
The appropriate condensing temperature is a control method of an air conditioner, characterized in that it corresponds to a temperature value above the minimum allowable condensing temperature and below the maximum allowable condensing temperature. 9. The method of claim 8,
When the condensing temperature is lower than the minimum allowable condensing temperature, reducing the opening degree of the flow control valve to reduce the flow rate of the cooling water,
When the condensing temperature is higher than the maximum allowable condensing temperature, the control method of the air conditioner, characterized in that by increasing the opening degree of the flow control valve to increase the flow rate of the cooling water.

Images