KR101271588B1 - Multi thermo-hygrostat using an air heat - Google Patents

Abstract

PURPOSE: A heat source multi-thermo-hygrostat is provided to generate cooling load capacity required to cool an indoor space while reducing the loads of each outdoor unit according to the outdoor temperature. CONSTITUTION: A heat source multi-thermo-hygrostat comprises an outdoor unit set(100) and a plurality of indoor units(200-1-200-n). The outdoor unit set includes: a plurality of outdoor units(10-1-10-n) includes a compressor(11), a condenser(12), an outdoor heat exchanger(13), and an expansion valve(14); a plurality of outdoor unit covers(20-1-20-n) which covers a plurality of outdoor units, includes dampers respectively, and blocks or makes the outdoor air supplied to the outdoor units pass by closing or opening the dampers; an outdoor unit controller(30) controlling a plurality of outdoor units and the outdoor unit covers; and an outdoor temperature sensor sensing the temperature of the outdoor air supplied to the outdoor units by being mounted on the outdoor unit covers. The indoor unit comprises an evaporator(50), an electronic valve(51), an electronic valve controller(40), an indoor unit controller(60), an indoor temperature sensor(70), an indoor humidity sensor(80), a re-heater(90), and a humidifier(95). [Reference numerals] (11) Compressor; (30) Outdoor unit controller; (40) Electronic value controller; (50) Evaporator; (60) Indoor unit controller; (70) Indoor temperature sensor; (80) Indoor humidity sensor; (90) Re-heater; (95) Humidifier; (AA) Outdoor; (BB) Indoor

Description

Multi thermo-hygrostat using an air heat}

The present invention relates to an air heat multi-constant hygrostat, and more particularly, comprising a plurality of outdoor units and a plurality of indoor units, and the indoor temperature and indoor humidity detected by an indoor temperature sensor and an indoor humidity sensor are different from a set temperature and a set humidity. To control the opening of the solenoid valve of the indoor unit by the difference in temperature and humidity, and transmits whether the solenoid valve is opened to the outdoor unit controller and calculates the heating and cooling load by summing the heating and cooling capacity of the indoor units in which the solenoid valve is opened. The present invention relates to an air heat multi-constant temperature and humidity controller capable of more efficiently cooling and heating by driving control.

In general, the thermo-hygrostat is a device that maintains constant heat and humidity.It is used in a computer room with a high sensible load, a communication machine room, a telephone exchange room with a low sensible load, a precision measurement room, a precision equipment room, a laboratory, etc. Device.

Because the room is mainly equipped with a system or device that generates a lot of heat, the cooling operation, dehumidification operation, and cooling operation humidification operation are mainly performed, but in winter, heating operation is sometimes necessary.

The heating operation in the conventional thermo-hygrostat was performed by a method of circulating indoor air by a blower after stopping the refrigeration cycle and operating only the heating heater. However, such heating heater heating not only takes a long time to reach the set temperature, but also is inefficient and consumes a lot of power.

In general, constant temperature and humidity line is installed to reduce the defective rate of production equipment. The air conditioner for constant temperature and humidity is composed of heating and cooling coil + humidifier + reheating heater. If the heating capacity is insufficient because it falls below minus 10 ℃ in winter, the reheating heater is activated to increase the heating capacity.

In addition, the conventional refrigerant circulation type thermo-hygrostat has a disadvantage that the piping distance between the indoor unit and the outdoor unit must be installed within 30 meters, which causes enormous cost and energy waste when installed in a circulating manner.

Since two refrigerant tubes are required for one indoor unit when transporting refrigerant between a plurality of outdoor units and a plurality of indoor units, for example, if four constant temperature and humidity controllers are installed, eight refrigerant tubes must be installed. The two refrigerant pipes or the common liquid pipe, the common liquid pipe, the high pressure gas pipe, and the low pressure gas pipe are used. As described above, the related art of concentrating the refrigerant transport pipe is disclosed in Korean Patent Laid-Open Publication No. 10-1992-0004792 (name: Multi-Aircon).

1 is a view illustrating a pipe laying of a conventional air conditioner composed of a plurality of outdoor units and a plurality of indoor units.

The liquid pipe 3a, the gas pipe 4a of each of the outdoor units 1a and 1b, and the liquid pipe 3b and the gas pipe 4b of each of the indoor units 2a, 2b, 2c, and 2d have a common liquid pipe 3 between the outdoor unit and the indoor unit. And the gas pipes 4, respectively, to transport the refrigerant.

It has a four-way valve 5 for heating / cooling, two-segmented outdoor heat exchangers 5a, 5b, electromagnetic expansion valves 6a, 6b, a receiver 6c, and an accumulator 6e of variable opening degree. Moreover, it has the liquid return path with the flow control valve 6d which connects the receiver 6c and the gas suction side of the compressor 7. As shown in FIG. Each of the indoor units 2a, 2b, 2c, and 2d has an indoor heat exchanger 15 and an electromagnetic expansion valve 8a of variable opening degree.

This conventional air conditioner has started to install the piping line that is piped between a plurality of indoor units and a plurality of outdoor units concentrated in two piping lines, but considering the heating and cooling load due to the difference between the outdoor temperature and the indoor temperature during the air conditioning operation Instead of driving the indoor unit and the outdoor unit, the load is concentrated on the outdoor unit and the indoor unit currently driven, and there is a problem in that a failure occurs due to an excessive force in the outdoor unit and the indoor unit currently being driven.

The present invention is to solve the above-mentioned problems, an object of the present invention is to receive the signal whether the solenoid valve is opened from the solenoid valve controller of the indoor unit during the heating and cooling operation by adding the heating and cooling capacity of the indoor unit with the solenoid valve open air conditioning heating load By calculating the appropriate number of outdoor units from a plurality of outdoor units in consideration of the cooling and heating loads of the indoor units currently in operation, so that the load is not concentrated in some outdoor units and distributed to many outdoor units, thereby improving the partial load efficiency and saving energy. It is to provide an air-heat thermo-hygrostat that can be installed and can be installed up to 150 meters in pipe distance.

Another object of the present invention is to heat the air that is lower than the set temperature after dehumidification in the summer with a heat pump to prevent the heat exchanger of the outdoor air and outdoor heat exchanger of the high temperature to reduce the heat applied to the compressor to reduce the load on the compressor It is to provide a thermo-hygrostat.

In order to achieve the above object, the air-heat multi-constant thermostat according to the present invention includes a compressor, a condenser, an outdoor heat exchanger, a plurality of outdoor units having an expansion valve, and a plurality of outdoor units, each of which includes a damper, A plurality of outdoor unit cover for blocking and passing the outdoor air supplied to the outdoor unit by controlling the opening and closing of the damper, an outdoor unit controller for controlling the plurality of outdoor units and the outdoor unit cover, and a plurality of outdoor unit covers installed in the outdoor unit cover An outdoor unit set including an outdoor temperature sensor configured to sense a temperature of outdoor air supplied to an outdoor unit of the outdoor unit; An evaporator which is connected to the plurality of outdoor units and constitutes a refrigerant circuit to heat the indoor air, an electronic valve that controls the indoor temperature by closing or opening the refrigerant circuit of the evaporator, and a difference between the indoor temperature and the set temperature from the indoor controller. And the solenoid valve controller for controlling the solenoid valve by receiving data on the difference between the indoor humidity and the set humidity, and receiving the indoor temperature and the indoor humidity data from the indoor temperature sensor and the indoor humidity sensor. Calculate and output to the solenoid valve controller and control the indoor temperature and the indoor humidity to the set temperature and the set humidity, an indoor temperature sensor that detects the indoor temperature and outputs it to the indoor controller, and indoor humidity An indoor humidity sensor for detecting and outputting the indoor humidity controller to the indoor unit controller, And configure the temperature of the cooled air into a wet operation for providing moisture to reheat the heater and the room air to heat the humidifier is configured to house a plurality of a plurality of indoor units, respectively so as to maintain a constant set temperature and set humidity.

According to an embodiment of the present invention, the outdoor unit controller receives the opening of each solenoid valve from each solenoid valve controller, calculates a cooling load by summing outputs of the opened indoor unit, and calculates a plurality of cooling loads according to the calculated cooling loads. Selecting a part of the outdoor unit is characterized in that for operating the plurality of outdoor units in the number suitable for the cooling load.

According to an embodiment of the present invention, the outdoor unit controller or a separate controller controls the motor installed in the damper of the outdoor unit cover to receive the temperature data of the outdoor air from the outdoor temperature sensor, and the temperature of the outdoor air is higher than the set point temperature. In this case, the damper is closed to prevent outdoor air from flowing into the outdoor unit cover.

According to an embodiment of the present invention, the solenoid valve controller receives a difference between the set temperature and the set humidity set by the user from the indoor unit controller to the room temperature and the room humidity, and opens the solenoid valve when the difference value is "+". When the difference is "-" or "0", the solenoid valve is controlled to be closed, and at the same time, the solenoid valve is opened or closed and is transmitted to the outdoor unit controller.

As described above, the air heat multi-constant temperature and humidity chamber according to the present invention outputs the difference value to the solenoid valve controller to open the solenoid valve when there is a difference between the room temperature and the set temperature or a difference between the room humidity and the set humidity. Controls and simultaneously transmits the capacity and open / close of the solenoid valve to the outdoor unit controller so that the outdoor unit controller can calculate the cooling load, and selects and drives an arbitrary outdoor unit from a plurality of outdoor units according to the calculated cooling load to operate the outdoor air temperature. In this way, it is possible to reduce the burden on each outdoor unit while generating the cooling load capacity required for cooling the room.

If the air temperature drawn in the outdoor unit differs from the set temperature and the critical temperature difference, the damper is closed so that the heat exchange is not performed directly between the outdoor unit and the outdoor air, but between the air inside the outdoor unit cover and the outdoor unit. By avoiding heat exchange between the outdoor air and the outdoor unit directly, it is possible to prevent the compressor from falling in efficiency or stopping the operation of the outdoor unit.

1 is a view illustrating a pipe arrangement of a conventional air conditioner composed of a plurality of outdoor units and a plurality of indoor units;
2 is a configuration diagram of a refrigeration cycle constituting an air-heat multi-constant thermo-hygrostat composed of a plurality of outdoor units and a plurality of indoor units according to the present invention;
3 is a perspective view of an outdoor unit cover showing a state in which the outdoor unit cover according to the present invention is covered with an outdoor unit,
4A and 4B are air flow diagrams illustrating the air flow inside the outdoor unit cover when the dampers are closed and opened according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only this embodiment to make the disclosure of the present invention complete and completely to the person skilled in the art the scope of the invention It is provided to inform you.

2 is a block diagram of a refrigeration cycle constituting an air-heat multi-constant temperature and humidity chamber composed of a plurality of outdoor units and a plurality of indoor units according to the present invention.

As shown, a plurality of outdoor units 10-1, 10-2, ..., 10 having a compressor 11, a condenser 12, an outdoor heat exchanger 13, and an expansion valve 14. -n) and a plurality of outdoor units (10-1, 10-2, ..., 10-n) and a damper (21), respectively, and the damper (21) under control of the outdoor unit controller (20). A plurality of outdoor unit covers (20-1, 20-2, ...) for opening and closing the outdoor air to block and pass the outdoor air supplied to the outdoor units (10-1, 10-2, ..., 10-n). , 20-n) and the plurality of outdoor units 10-1, 10-2, ..., 10-n and outdoor unit covers 20-1, 20-2, ..., 20-n Mounted to the outdoor unit controller 20 and the outdoor unit covers 20-1, 20-2, ..., 20-n, and the plurality of outdoor units 10-1, 10-2, ..., 10- an outdoor unit set 100 including an outdoor temperature sensor 31 for sensing a temperature of outdoor air supplied to n);

The evaporator 50 and the refrigerant circuit of the evaporator 50 are connected to the plurality of outdoor units 10-1, 10-2,. The solenoid valve 51 for controlling the room temperature by closing or opening the door, and receiving data about the difference between the room temperature and the set temperature and the difference between the room humidity and the set humidity from the indoor unit controller 60 to open the solenoid valve 51. The solenoid valve controller 40 and the indoor temperature sensor 70 and the indoor humidity sensor 80 receive the indoor temperature and the indoor humidity data from the set temperature and the set humidity and the difference between the solenoid valve controller 40 And an indoor unit controller 60 for controlling the indoor temperature and the indoor humidity to the set temperature and the set humidity, an indoor temperature sensor 70 for detecting the temperature of the room and outputting the indoor temperature to the indoor controller 60, and To detect the humidity of the indoor unit cone An indoor humidity sensor 80 output to the controller 60, a reheat heater 90 for heating the temperature of the air cooled by the dehumidification operation of the evaporator 50, and a humidifier 95 for providing moisture to the indoor air. And a plurality of indoor units 200-1, 200-2,..., 200-n to maintain a plurality of rooms at a predetermined set temperature and set humidity, respectively.

The plurality of outdoor units 10-1, 10-2,..., 10-n include a compressor 11, a condenser 12, an outdoor heat exchanger 13, an expansion valve 14, and an accumulator 15. It is provided with a pair of refrigerant pipes (110a, 110b) connected to each of the evaporator 50 installed in the plurality of indoor units (200-1, 200-2, ..., 200-n) to form a refrigerant circuit .

The compressor 11 compresses the refrigerant gas introduced from the evaporator 50 through the refrigerant pipe 110b so as to be in a state of high temperature and high pressure. The refrigerant converted into a state of high temperature and high pressure in the compressor 11 is discharged to the outdoor heat exchanger 13 corresponding to the condenser through the four-way valve 12.

The heat is released from the outdoor heat exchanger 13 to the outdoor air and becomes liquid as the temperature decreases. The refrigerant converted into the low temperature liquid state in the outdoor heat exchanger 13 is converted from the high pressure liquid to the low pressure liquid while passing through the expansion valve 14.

The low pressure liquid refrigerant discharged from the expansion valve 14 passes through the refrigerant pipe 110a to each evaporator 50 of the plurality of indoor units 200-1, 200-2, ..., 200-n. 51 and the low pressure liquid refrigerant introduced into the evaporator 50 vaporizes and cools the indoor air of the indoor unit (eg, 200-1).

 The outdoor unit controller 20 receives the opening of each solenoid valve 51 from each solenoid valve controller 40, calculates a cooling load by summing outputs of the opened indoor unit 200, and calculates the cooling load according to the calculated cooling load. By selecting a part of the plurality of outdoor units 10-1, 10-2, ..., 10-n, a plurality of outdoor units (for example, 10-1, 10-2, and 10-) are suitable for the cooling load. 4, etc.).

The outdoor temperature sensor 31 is installed in the damper 21 of the outdoor unit cover 20 and detects the temperature of the outdoor air sucked through the damper 21 and outputs it to the outdoor unit controller 20 to output the temperature of the outdoor air. Is a threshold value (eg, 12 ° C.) or higher than a set point temperature, the damper 21 is closed to prevent outdoor air from flowing into the outdoor unit cover 20 so that the outdoor unit is selected according to the calculated target load. To change.

Evaporator 50 installed in a plurality of indoor units (200-1, 200-2, ..., 200-n) and the plurality of outdoor units (10-1, 10-2, ..., 10-n) It is connected through a pair of refrigerant pipes (110a, 110b) to form a refrigerant circuit so that heat exchange is performed between the indoor air installed in the indoor unit (for example, 200-1) and the refrigerant flowing through the evaporator 50 do.

The solenoid valve 51 installed in the plurality of indoor units 200-1, 200-2,..., 200-n closes or enumerates the refrigerant circuit of the evaporator 50 under the control of the solenoid valve controller 40. Then, the heat exchange between the air in the room where the indoor unit (for example, 200-1) is installed and the evaporator 50 installed in the indoor unit (for example, 200-1) is controlled.

The indoor temperature sensor 70 and the indoor humidity sensor 80 detect temperature and humidity of each room, respectively, and output the same to the indoor unit controller 60 of the corresponding indoor unit (for example, 200-1).

The indoor unit controller 60 compares the set temperature and set humidity input by the user with the current room temperature and the indoor humidity input from the indoor temperature sensor 70 and the indoor humidity sensor 80, respectively, and the difference between the temperature and the humidity. It calculates and outputs to the solenoid valve controller 40, and to control the indoor temperature and the indoor humidity to the set temperature and the set humidity to control the heat exchange between the boom 50 and the indoor air.

The reheat heater 90 heats the temperature of the air cooled by the dehumidification operation of the evaporator 50, and the humidifier 95 provides moisture to the indoor air.

Hereinafter, a plurality of outdoor units 10-1, 10-2,..., 10-n and a plurality of outdoor unit covers 20-1, 20-2,..., 20-n and a plurality of indoor units 200 are described below. When referring to -1, 200-2, ..., 200-n) to represent the outdoor unit 10, the outdoor unit cover 20 and the indoor unit 200 by simply using a representative code, the description of the code becomes complicated The same reference numerals are used to avoid the complexity of the code description for the other components.

During the cooling operation, the high temperature and high pressure gas discharged from the compressor 11 of the outdoor unit 10 passes through the four-way valve 12 and heat-exchanges in the outdoor heat exchanger 13 which is a condenser and is converted into a gaseous refrigerant into a liquid refrigerant. . At this time, the outdoor expansion valve 14 is in an open state.

The liquid refrigerant is supplied to the evaporator 50 of each of the indoor units 200-1, 200-2,..., 200-n in operation through the liquid refrigerant pipe 110a, and the low pressure of each solenoid valve 51 is supplied. The liquid refrigerant is depressurized to exchange heat with indoor air in each evaporator 50 to form a low pressure gas.

The low pressure gas is passed from the indoor units 200-1, 200-2, ..., 200-n through the four-way valve 12 and the accumulator 15 of the outdoor unit 10 through the gas refrigerant pipe 110b. Returning to (11), it becomes a compressed high-temperature, high-pressure refrigerant gas, and is discharged again to the four-way valve 12.

During the heating operation, the high-temperature and high-pressure gas discharged from the compressor 11 of the outdoor unit 10 passes through the four-way valve 12 and the refrigerant gas pipe 110a to operate the indoor units 200-1 and 200-2 during operation. , ..., 200-n), and is evaporated by heat exchange with indoor air in the evaporator 50 to form a gas refrigerant. In this case, the indoor solenoid valve 51 is open and controlled by the solenoid valve controller 40.

The gas refrigerant, which is evaporated and heat exchanged with the indoor air in the evaporator 50, is discharged to the compressor 11 through the four-way valve 12 and the accumulator 15 of the outdoor unit 10 through the gas refrigerant pipe 110b. It is compressed and becomes a gas of high temperature and high pressure, and is discharged again to the four-way valve 12.

As described above, the outdoor unit controller 20 according to the present invention receives the present detection temperature and the detected humidity of each room from the respective solenoid valve controllers 40 and the difference temperature and the difference humidity between the set temperature and the set humidity, and calculates a cooling and heating load. According to the cooling and heating load, a part of the plurality of outdoor units 10-1, 10-2, ..., 10-n is selected to perform cooling and heating operation.

The thermo-hygrostat according to the present invention includes an indoor temperature sensor 70 and an indoor humidity sensor 80 in each indoor unit 200-1, 200-2, ..., 200-n, and the indoor unit controller 60 is The indoor temperature and indoor humidity of the room where the indoor unit is installed are received from the indoor temperature sensor 70 and the indoor humidity sensor 80 and output to the solenoid valve controller 40 to perform cooling and heating, humidification and dehumidification operation.

The indoor unit controller 60 according to the present invention compares the indoor temperature and the indoor humidity received from the indoor temperature sensor 70 and the indoor humidity sensor 80 with the set temperature and the set humidity set by the user, and compares the difference with the solenoid valve controller. Output to (40).

The solenoid valve controller 40 receives the difference temperature value and the difference humidity value from the indoor unit controller 60, and opens the solenoid valve 51 when the difference value is "+", and the difference value is "-" or " If it is 0 ", the solenoid valve 51 is controlled to close.

As such, if there is a difference between the set temperature and the room temperature or a difference between the set humidity and the room humidity, the heat exchange is performed between the evaporator 51 and the indoor air by opening the solenoid valve 51.

On the other hand, the solenoid valve controller 40 controls the solenoid valve 51 according to the difference temperature value and the difference humidity value, and transmits to the outdoor unit controller 30 whether the solenoid valve 51 is open or closed. At this time, the solenoid valve controller 40 and the outdoor unit controller 30 may communicate, for example, by RS-485 communication, RS-232C communication, or the like.

The outdoor unit controller 30 receives the opening of the solenoid valve 51 from each solenoid valve controller 40 and calculates the sum of the cooling loads. For example, the solenoid valve 51 of the first chamber 200-1 is opened, the solenoid valve 51 of the second chamber 200-2 is opened, and the electron of the n-th chamber 200-n is opened. When data is received from the solenoid valve controller 40 that the valve 51 is open and the remaining indoor unit 200 is closed, the outdoor unit controller 30 calculates the cooling load as follows.

Capacity of the first indoor unit 200-1: 50 Hp, capacity of the second indoor unit 200-2: 50 Hp, capacity of the nth indoor unit 200-n: 100 Hp Total cooling load currently required Calculates 50 HP + 50 HP + 100 HP = 200 HP.

Therefore, the outdoor unit controller 20 selects and drives the optimal number of outdoor units among the plurality of outdoor units 10-1, 10-2, ..., 10-n to generate an output corresponding to the total cooling load. To control.

For example, if each outdoor unit 10 has a capacity of up to 50 HP, at least four outdoor units must be driven to generate a cooling load of 200 HP, and each outdoor unit 10 has a capacity of up to 50 HP. However, if it is driven to the maximum, it will be unreasonable, and when each outdoor unit 10 is operated at a capacity ratio of 80%, the first outdoor unit 10-1, the second outdoor unit 10-2, and the third outdoor unit 10- 3), the fourth outdoor unit 10-4 and the fifth outdoor unit 10-5 can be driven at 80% capacity, respectively, to generate a total of 200 Hp of cooling capacity in five outdoor units.

In this case, it is necessary to select the first outdoor unit 10-1, the second outdoor unit 10-2, the third outdoor unit 10-3, the fourth outdoor unit 10-4, and the fifth outdoor unit 10-5. None of the plurality of outdoor units 10-1, 10-2,..., 10-n may be selected from five outdoor units, for example, the third outdoor unit 10-3 and the fifth outdoor unit 10-5. The eight outdoor units 10-8, the ninth outdoor unit 10-9, and the tenth outdoor unit 10-10 may be selected and driven.

In addition, it is not necessary to select and operate five outdoor units, and the cooling load is larger than usual when the temperature is too high and differs from the room temperature depending on the outdoor temperature (for example, 7 ° C or more). Since the load can be reduced, the operation rate can be lowered to reduce the burden on the compressor, and instead, the number of driving units can be selected to drive the compressor while reducing the load.

For example, when the maximum capacity of each outdoor unit is 50 Hp, the ten first outdoor unit 10-1, the second outdoor unit 10-2,. If 10 units are operated with the capacity of%, the load of each outdoor unit can be reduced by half, and the total cooling capacity can be driven to 200 Hp.

When the outdoor temperature is too high to be different from the indoor temperature during the hot summer season (for example, 7 ° C. or more), eight first outdoor units (10-1), second outdoor units (10-2), and third outdoor units (10-3), 4th outdoor unit (10-4), 5th outdoor unit (10-5), 6th outdoor unit (10-6), 7th outdoor unit (10-7), and 8th outdoor unit (10-8) If you select and drive 8 units with 50% capacity, the total of 8 units can be driven at 200Hp, so you can generate the cooling load capacity required for cooling the room while reducing the burden on each outdoor unit according to the outdoor temperature.

Although the above description has been given of the cooling operation, the direction of the four-way valve 12 of the outdoor unit 10 is also changed for the heating operation, and the outdoor heat exchanger 13 absorbs heat from the outdoor air and the heat exchanger of the indoor unit 200 The same can be explained other than dissipating heat at 50.

When the indoor air is cooled down to the dew point of the indoor humidity (usually within 12 ℃) to dehumidify in summer, and then operate the indoor unit and the outdoor unit in the heating mode to heat it again to the set room temperature (usually within 22 ℃). If a temperature difference of 7 ° C. or more occurs between the outdoor temperature and the set indoor temperature, heat exchange between the outdoor unit and the outdoor air is not performed smoothly.

Accordingly, the outdoor unit 10 according to the present invention is covered with the outdoor unit cover 20 as shown in FIG. 3, but the lower space is opened, but the upper and side intermediate portions are installed to be closed. The damper 21 is provided on the upper surface of the outdoor unit cover 20, and is opened or closed by the control of the outdoor unit controller 30.

When the damper 21 is closed, the upper surface of the outdoor unit cover 20 is closed and the outdoor air sucked in the open lower space is not discharged to the outside, so that the damper 21 stays in the internal space of the outdoor unit cover 20.

As shown in FIG. 4A, when the damper 21 is open, the air discharged from the blower fan 16 installed on the upper surface of the outdoor unit 10 exchanges heat with the liquid refrigerant circulating inside the heat exchanger 13 of the outdoor unit 10. After being discharged to the outside of the outdoor unit cover 10 through the damper (21).

However, when the temperature of the outside air becomes more than 30 ℃ as in the summer season, the liquid refrigerant is adiabatic expansion in the heat exchanger 13 of the outdoor unit 10 to discharge heat to the outside air of 30 ℃ or more passing through the outdoor unit 10, but the heat exchange Since the temperature difference between the liquid refrigerant in the air 13 and the outside air is not large, heat exchange is not performed as efficiently as necessary, so that the compressor 11 of the outdoor unit 10 abnormally consumes electric energy, thereby reducing the efficiency of the compressor. Problems such as oil or burned out lubricants may occur.

In order to solve this problem, the outdoor unit cover 20 according to the present invention is installed by being covered with the outdoor unit 10, and as shown in FIG. 4B, when the damper 21 installed on the upper surface of the outdoor unit cover 20 is closed, the outdoor unit ( The air discharged from the blower fan 16 of 10) is circulated in the internal space of the outdoor unit cover 20 without being discharged to the outside.

As a result, the temperature of the air sucked back into the inlet 17 of the outdoor unit 10 is maintained to be lower than the temperature of the liquid refrigerant (for example, 50 ° C.) flowing inside the heat exchanger 13 of the outdoor unit 10. Therefore, even if the outdoor temperature is a high temperature (eg, 30 ° C.), the liquid refrigerant may be efficiently heat-exchanged in the heat exchanger 13.

If the air temperature sucked into the outdoor unit 10 differs from the set temperature by more than a critical temperature difference (eg, 7 ° C), the damper 21 is closed to directly exchange heat between the outdoor unit 100 and the outdoor air. By performing heat exchange between the air inside the outdoor unit cover 10 and the outdoor unit 10, the heat exchange between the outdoor air 10 and the outdoor unit 10 is prevented from being lowered and the efficiency of the compressor is lowered. The same applies to cooling operation at low temperatures in winter.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

10: outdoor unit 11: compressor
12: condenser 13: outdoor heat exchanger
14: expansion valve 15: accumulator
16: Blower fan 17: Inlet
20: outdoor unit cover 30: outdoor unit controller
31: temperature sensor 40: solenoid valve controller
50: evaporator 51: expansion valve
60: indoor unit controller 70: room temperature sensor
80: indoor humidity sensor 90: reheat heater
95: humidifier 100: outdoor unit set
200: indoor unit

Claims (4)

A plurality of outdoor units (10-1, 10-2, ..., 10-n) having a compressor (11), a condenser (12), an outdoor heat exchanger (13), and an expansion valve (14), Covering the plurality of outdoor units 10-1, 10-2,..., 10-n and having dampers 21, respectively, to open or close the dampers 21 under the control of the outdoor unit controller 20. A plurality of outdoor unit cams 20-1, 20-2, ..., 20-n for blocking and passing outdoor air supplied to the outdoor units 10-1, 10-2, ..., 10-n. And an outdoor unit controller 20 for controlling the plurality of outdoor units 10-1, 10-2,..., 10-n and the outdoor unit covers 20-1, 20-2,. And the outdoor unit covers 20-1, 20-2, ..., 20-n, and are supplied to the plurality of outdoor units 10-1, 10-2, ..., 10-n. An outdoor unit set 100 including an outdoor temperature sensor 31 for sensing a temperature of outdoor air;
The evaporator 50 and the refrigerant circuit of the evaporator 50 are connected to the plurality of outdoor units 10-1, 10-2,. The solenoid valve 51 for controlling the room temperature by closing or opening the door, and receiving data about the difference between the room temperature and the set temperature and the difference between the room humidity and the set humidity from the indoor unit controller 60 to open the solenoid valve 51. The solenoid valve controller 40 and the indoor temperature sensor 70 and the indoor humidity sensor 80 receive the indoor temperature and the indoor humidity data from the set temperature and the set humidity and the difference between the solenoid valve controller 40 And an indoor unit controller 60 for controlling the indoor temperature and the indoor humidity to the set temperature and the set humidity, an indoor temperature sensor 70 for detecting the temperature of the room and outputting the indoor temperature to the indoor controller 60, and To detect the humidity of the indoor unit cone An indoor humidity sensor 80 output to the controller 60, a reheat heater 90 for heating the temperature of the air cooled by the dehumidification operation of the evaporator 50, and a humidifier 95 for providing moisture to the indoor air. And a plurality of indoor units 200-1, 200-2,..., 200-n configured to maintain a plurality of rooms at a predetermined set temperature and set humidity, respectively. . The method of claim 1,
The outdoor unit controller 20 receives whether each solenoid valve 51 is opened from each solenoid valve controller 40, calculates a cooling load by summing outputs of the opened indoor unit 200, and calculates the cooling load. Accordingly, a plurality of outdoor units (10-1, 10-2, ..., 10-n) by selecting a part of the air heat multi-hygrostat, characterized in that for operating the plurality of outdoor units in the number suitable for the cooling load. The method of claim 1,
The outdoor unit controller 20 is installed in the damper 21 of the outdoor unit cover 20 and receives the temperature data of the outdoor air from the outdoor temperature sensor 31 and the damper when the temperature of the outdoor air is higher than the set point temperature by more than a threshold value. Air heat multi constant temperature and humidity characterized in that the outdoor air is not introduced into the outdoor unit cover 20 by closing (21). The method of claim 1,
The solenoid valve controller 40 receives the difference between the set temperature and the set humidity set by the user from the indoor unit controller 60 to the indoor temperature and the set humidity, and opens the solenoid valve 51 when the difference value is "+". And if the difference is "-" or "0", the solenoid valve 51 is controlled to be closed, and at the same time, the solenoid valve 51 is opened or closed and is transmitted to the outdoor unit controller 30. Multi constant temperature and humidity.

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