KR101003356B1 - Air Conditioner And Control Method Thereof - Google Patents

Air Conditioner And Control Method Thereof Download PDF

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Publication number
KR101003356B1
KR101003356B1 KR20030073328A KR20030073328A KR101003356B1 KR 101003356 B1 KR101003356 B1 KR 101003356B1 KR 20030073328 A KR20030073328 A KR 20030073328A KR 20030073328 A KR20030073328 A KR 20030073328A KR 101003356 B1 KR101003356 B1 KR 101003356B1
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South Korea
Prior art keywords
outdoor
compressor
indoor
indoor unit
unit
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KR20030073328A
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Korean (ko)
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KR20050038115A (en
Inventor
김우현
정규하
정현석
Original Assignee
삼성전자주식회사
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Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR20030073328A priority Critical patent/KR101003356B1/en
Priority to CNB2004100022859A priority patent/CN1324272C/en
Priority to EP20040250231 priority patent/EP1526341B1/en
Priority to DE200460001501 priority patent/DE602004001501T2/en
Priority to JP2004016196A priority patent/JP3857274B2/en
Publication of KR20050038115A publication Critical patent/KR20050038115A/en
Application granted granted Critical
Publication of KR101003356B1 publication Critical patent/KR101003356B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2221/00—Details or features not otherwise provided for
    • F24F2221/54—Heating and cooling, simultaneously or alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/007—Compression machines, plants or systems with reversible cycle not otherwise provided for three pipes connecting the outdoor side to the indoor side with multiple indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0294—Control issues related to the outdoor fan, e.g. controlling speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07—Details of compressors or related parts
    • F25B2400/075—Details of compressors or related parts with parallel compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/027—Compressor control by controlling pressure
    • F25B2600/0271—Compressor control by controlling pressure the discharge pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/172—Speeds of the condenser fan
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention includes an outdoor control unit for controlling the outdoor unit in a multi air conditioner in which a plurality of indoor units are connected to the outdoor unit. By controlling the opening degree of the outdoor electric expansion valve by using the information on the operating load of the indoor unit provided from each indoor control unit of the outdoor control unit to adjust the refrigerant sent to the indoor unit of the heating operation and the indoor unit of the cooling operation appropriately. . In addition, the outdoor control unit sets the compression capacity of the compressor according to the outdoor temperature, and controls the discharge pressure of the compressor by controlling the outdoor fan.

Figure R1020030073328

Description

Air Conditioner And Control Method Thereof

1 is a refrigerant circuit diagram showing the configuration of an air conditioner according to the present invention.

2 is a view showing a refrigerant flow when the air conditioner according to the present invention performs the cooling main air conditioning operation at the same time.

3 is a graph showing a driving performance that varies depending on the opening degree of the outdoor electric expansion valve when the total heating load is greater than the total cooling load in the air conditioner according to the present invention.

Figure 4 is a graph showing the operating performance changes according to the opening degree of the outdoor electric expansion valve when the total heating load is not greater than the total cooling load in the air conditioner according to the present invention.

5A and 5B are flowcharts of a control method of the air conditioner according to the present invention.

[Description of the Reference Numerals]

100: outdoor unit

120: outdoor control

200a, 200b, 200c, 2000d: Indoor unit

300: refrigerant switching circuit

The present invention relates to an air conditioner and a method of controlling the same, wherein a plurality of indoor units are connected to an outdoor unit and the heating and cooling operations can be simultaneously performed in the indoor unit.

Conventional multi-air conditioners typically perform air conditioning operation on an indoor space by connecting a plurality of indoor units to one outdoor unit. The outdoor unit is equipped with a compressor, an outdoor heat exchanger and an outdoor electric expansion valve, and the indoor unit is provided with an indoor heat exchanger and an indoor electric expansion valve.

Residents of indoor spaces in which indoor units are installed typically set desired air conditioning conditions individually.

Since the degree of sensation felt by the occupants may be different depending on the environment of the season or the indoor space, the operation mode applied to the entire indoor unit may be simultaneously performed without cooling or heating.

When performing cooling and heating at the same time, there are more air conditioning heating and cooling units in the indoor unit of the cooling operation and more air heating units in the heating unit.

In the case of simultaneous operation of cooling and heating, the discharged refrigerant of the compressor branches and is sent to the indoor unit corresponding to the cooling or heating operation. That is, the refrigerant discharged from the compressor of the outdoor unit is sent to the outdoor heat exchanger side acting as a condenser, and a part of the discharged refrigerant is sent to the indoor heat exchanger side of the indoor unit requiring heating operation without passing through the outdoor heat exchanger.

The operating load in an indoor unit for cooling or heating operation changes frequently. For this reason, even if the operation number of the indoor unit for heating operation is relatively small compared to the operation number of the indoor unit for cooling operation, the operating load of the indoor unit for heating operation may be much larger than the operation load of the indoor unit for cooling operation.

However, since the conventional air conditioner controls the discharge refrigerant based only on the number of operations of the indoor unit, it is difficult to accurately adjust the amount of refrigerant to accurately reflect the operating load of the indoor unit.

Since the conventional air conditioner has not properly adjusted the amount of refrigerant branching in response to the operating load of the indoor unit, the refrigerant supplied to the indoor unit of the heating operation may be insufficient while the refrigerant supplied to the indoor unit of the heating operation may be insufficient. Both the heating performance of the indoor unit to operate and the cooling performance of the indoor unit to operate are deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner and a control method thereof in which the amount of refrigerant flowing from an compressor to an indoor unit can be properly adjusted in consideration of the operating load of the indoor unit in simultaneous heating and cooling operations.

The present invention for achieving the above object, an outdoor unit having a compressor, an outdoor side heat exchanger, an outdoor side electric expansion valve, an opening / closing valve; A plurality of indoor units each having an indoor side heat exchanger; A first refrigerant flow passage through which the discharged refrigerant of the compressor passes through the open / close valve in the compressor and flows into the indoor unit; A second refrigerant flow passage through which the discharged refrigerant of the compressor passes through the outdoor side heat exchanger and the outdoor side electric expansion valve to the indoor unit; And a control unit for controlling the amount of refrigerant flowing through the first refrigerant passage and the amount of refrigerant flowing through the second refrigerant passage according to the operating load of the indoor unit.

The on-off valve has an inlet connected between the compressor and an outdoor side heat exchanger and an outlet connected to the indoor unit side.

The outdoor expansion valve is connected to the outlet of the outdoor heat exchanger.

The control unit controls the on-off valve and the outdoor-side expansion valve in order to adjust the amount of refrigerant flowing through the first refrigerant passage or the second refrigerant passage.

The control unit controls an indoor control unit for providing an operating load of the indoor unit for cooling operation or heating operation, and controlling the opening / closing of the open / close valve and the opening degree of the outdoor electric expansion valve according to the operating load provided from the indoor control unit. It includes an outdoor control unit.

The outdoor control unit sets the opening degree of the outdoor electric expansion valve to satisfy both the performance of the indoor unit for cooling operation and the performance of the entire operation indoor unit including the cooling operation and the heating operation when the cooling subjects simultaneously operate the heating and cooling.

The indoor unit further includes an indoor temperature sensor, and the indoor control unit calculates an operating load according to a difference between an indoor temperature and a set temperature of the indoor unit.

The outdoor control unit compares the total heating operation load of the indoor unit for heating operation with the total cooling operation load of the indoor unit for cooling operation and sets the opening degree of the outdoor expansion valve according to the comparison result.

The present invention for achieving the above object is an outdoor unit having a compressor, an outdoor side heat exchanger, an outdoor side expansion valve, an open / close valve, an outdoor fan, an outdoor temperature sensor, a pressure sensor; A plurality of indoor units each having an indoor temperature sensor and an indoor side heat exchanger; A first refrigerant flow passage through which the discharged refrigerant of the compressor passes through the open / close valve in the compressor and flows into the indoor unit; A second refrigerant flow passage through which the discharged refrigerant of the compressor passes through the outdoor side heat exchanger and the outdoor side electric expansion valve to the indoor unit; An indoor control unit for calculating an operating load of the indoor unit and providing the calculated operating load according to a difference between an indoor temperature and a set temperature detected by the indoor temperature sensor; And controlling the opening and closing of the on-off valve and the opening degree of the outdoor side electric expansion valve according to the operating load provided from the indoor control unit, and setting the compression capacity of the compressor according to the outdoor temperature detected by the outdoor temperature sensor. At the same time, when driving the compressor according to the set compression capacity characterized in that it comprises an outdoor control unit for controlling the speed of the outdoor fan in accordance with the discharge pressure of the compressor detected by the pressure sensor.

The outdoor controller sets the compression capacity of the compressor as the detected outdoor temperature is higher.

The outdoor controller increases the speed of the outdoor fan to decrease the discharge pressure of the compressor and decreases the speed of the outdoor fan to increase the discharge pressure of the compressor.

The apparatus further includes a speed sensor for detecting a speed of the outdoor fan, and the outdoor controller controls the outdoor fan based on the speed of the outdoor fan detected by the speed sensor.

The present invention for achieving the above object is a compressor, an outdoor side heat exchanger, an outdoor side expansion valve, an outdoor unit having an on-off valve, a plurality of indoor units each having an indoor side heat exchanger, the discharge refrigerant of the compressor is the compressor The first refrigerant flow path flowing through the on-off valve to the indoor unit, the discharge refrigerant of the compressor flows through the outdoor heat exchanger and the outdoor electric expansion valve in the compressor to the second refrigerant flow path flowing in the indoor unit In the control method of the air conditioner provided, calculating the operating load of the indoor unit, and controlling the amount of refrigerant flowing through the first refrigerant passage and the amount of refrigerant flowing by the second refrigerant passage in accordance with the calculated operating load. It features.

The operating load of the indoor unit is calculated according to the difference between the indoor temperature and the set temperature of the indoor unit.

The driving load is calculated by calculating the total cooling operation load of the indoor unit for the cooling operation and the total heating operation load of the indoor unit for the heating operation when the cooling subjects air conditioning simultaneous operation of the cooling subjects, and compares the total heating operation load with the total cooling operation load The opening and closing of the on-off valve and the opening degree of the outdoor expansion valve are controlled according to the comparison result.

The opening degree control of the outdoor electric expansion valve ensures that the performance of the indoor unit for cooling operation and the performance of the entire operation indoor unit including the cooling operation and the heating operation are satisfied when the cooling main body is simultaneously heating and cooling.

After the control of the amount of refrigerant, the outdoor temperature is sensed using the outdoor temperature sensor provided in the outdoor unit, and the compression capacity of the compressor is set according to the detected outdoor temperature.

When the compressor is driven according to the set compression capacity, the discharge pressure of the compressor is sensed and the speed of the outdoor fan provided in the outdoor unit is controlled according to the detected discharge pressure of the compressor.

The control of the speed of the outdoor fan compares the discharge pressure of the compressor with the set reference pressure.As a result of the comparison, if the discharge pressure of the compressor is large, the speed of the outdoor fan is increased, and if the discharge pressure of the compressor is less than the reference pressure, When the discharge pressure of the compressor is less than the reference pressure, the speed of the outdoor fan is reduced.

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

The present invention applies to a multi-type air conditioner in which a plurality of indoor units are connected to an outdoor unit.

As shown in FIG. 1, the air conditioner according to the present invention is connected between the outdoor unit 100, the four indoor units 200a, 200b, 200c, 200d and the outdoor unit and the indoor unit to flow of refrigerant. It is provided with a refrigerant switching circuit 300 for switching.

The outdoor unit 100 is connected to an outdoor electric expansion valve 102 and an outdoor electric expansion valve connected to the outlet side of the outdoor heat exchanger 101a and 101b, the outdoor fan 113, and the outdoor heat exchanger 101a and 101b. Open / close valve 111 and check valve 112 connected in parallel, variable capacity compressors 103a and 103b, four-way valve 104, pressure sensor 105, receiver 106, accumulator 107, discharge refrigerant from compressor It includes the on-off valve 109 and the check valve 110 for bypassing the outdoor heat exchanger without passing through to the indoor unit side of the heating operation.

The outdoor unit 100 includes an outdoor temperature sensor 108 for detecting an outdoor temperature, a speed sensor 114 for detecting a speed of an outdoor fan 113, and a pressure for detecting a discharge pressure of a refrigerant discharged from a compressor. The sensor 105 is provided.

In addition, the air conditioner of the present invention includes an outdoor control unit 120 for controlling the outdoor unit.

The outdoor control unit 120 controls the opening degree of the outdoor electric expansion valve 102 by using the information on the operating load of the indoor unit provided from the indoor control unit, which will be described later, and sends it to the indoor unit of the heating operation and the indoor unit of the cooling operation. Controls the refrigerant appropriately and controls the compressors 103a and 103b and the outdoor fan 113 by using the information provided through the outdoor temperature sensor 108, the speed sensor 114, and the pressure sensor 105.

Each indoor unit 200a, 200b, 200c, 200d includes an indoor heat exchanger 201a, 201b, 201c, 201d, an indoor electric expansion valve 202a, 202b, 202c, 202d, and an indoor temperature for sensing an indoor temperature. Sensors 203a, 203b, 203c, and 203d.

The air conditioner of the present invention has indoor control units 210a, 210b, 210c, and 210d for controlling each indoor unit.

Each indoor control unit calculates the operating load of the corresponding indoor unit according to the difference between the room temperature detected by the room temperature sensors 203a, 203b, 203c, and 203d and the set temperature set by the user through a function key or a remote controller. Information about the calculated operating load is provided to the outdoor controller 120, respectively.

In addition, the indoor control unit controls the indoor-side electric expansion valves (202a, 202b, 202c, 202d) and the indoor fan (not shown) in association with the outdoor control unit.

The refrigerant switching circuit 300 is a high pressure gas valve (301a, 301b, 301c, 301d) installed in the high pressure gas pipe (HPP) between the outdoor unit 100 and each indoor unit (200a, 200b, 200c, 200d), low pressure gas pipe Low pressure gas valves 302a, 302b, 302c and 302d respectively installed on the LPP, and electric motors installed on the common hydraulic line discharged from the indoor units 200a, 200b, 200c and 200d to the outdoor unit 100 side. Expansion valve 303 is included. Each valve constituting the refrigerant switching circuit operates under the control of the outdoor control unit.

One end of the four-way valve 104 of the outdoor unit 100 and the high pressure gas valves 301a, 301b, 301c, and 301d of the refrigerant switching circuit 300 are connected through the high pressure gas pipe HPP. In addition, the accumulator 107 of the outdoor unit 100 and the low pressure gas valves 302a, 302b, 302c, and 302d of the refrigerant switching circuit 300 are connected through a low pressure gas pipe (LPP).

A return pipe RP is installed between the outdoor side heat exchanger 101a and 101b of the outdoor unit 100 and the refrigerant switching circuit 300. The return pipe RP is provided with an outdoor expansion valve 102. Is installed. The on-off valve 111 connected in parallel with the electric expansion valve 102 is a valve for adjusting the flow rate.

The return pipe RP and the pipes EP1, EP2, EP3, EP4 of each indoor side heat exchanger 201a, 201b, 201c, 201d are connected.

Hereinafter, the process of simultaneously operating the cooling subjects air conditioning.

Referring to FIG. 2, one indoor unit 200a is in a heating operation mode and the remaining three indoor units 200b, 200c, and 200d are set in a cooling operation mode.

Referring to the operation of FIG. 2, first, the compressors 103a and 103b are driven, the outdoor electric expansion valve 102 is opened to a predetermined opening degree, the on / off valve 109 is opened, and the high pressure of the indoor unit side of the heating operation is opened. The gas valve 301a is opened, the high pressure gas valves 301b, 301c, and 301d on the indoor unit side of the cooling operation are closed, and the low pressure gas valve 302a on the indoor unit side of the heating operation is closed, and the indoor operation of the cooling operation is performed. The low pressure gas valves 302b, 302c and 302d on the unit side are opened.                     

The refrigerant discharged from the compressors 103a and 103b exchanges heat through the outdoor side heat exchangers 101a and 101b, passes through the outdoor side electric expansion valve 102, and is then sent to the indoor unit side of the cooling operation. In addition, a part of the refrigerant discharged from the compressors 103a and 103b is sent to the indoor unit for heating after passing through the on / off valve 109 and the check valve 110.

The outdoor control unit 120 sets the opening degree of the outdoor electric expansion valve 102 in consideration of the total heating operation load of the indoor unit for heating operation and the total cooling operation load of the indoor unit for cooling operation, thereby controlling the indoor unit and heating for the cooling operation. Adjust the amount of refrigerant sent to the indoor unit of operation.

This will be described with reference to FIGS. 3 and 4.

The outdoor control unit 120 controls the opening degree of the outdoor electric expansion valve in consideration of the operation load of the indoor unit of the cooling operation and the operation load of the indoor unit of the heating operation.

For example, when the total heating operation load for the indoor unit of the heating operation provided to each indoor control unit is greater than the total cooling operation load for the indoor unit of the cooling operation, the opening degree of the outdoor electric expansion valve 102 is set to the first set opening degree. Set to a value. Here, the first set opening value is stored in advance as data obtained through a test. As shown in FIG. 3, when the indoor temperature is 20 ° C. (excluding humidity) / 15 ° C. (humidity including temperature) and the outdoor temperature is tested at −5 ° C., When the first set opening value for the outdoor electric expansion valve 102 is set to 50% (see A), the performance of the indoor unit for cooling operation and the performance of the entire operating indoor unit (the indoor unit for heating operation and the indoor operation for cooling operation). It can be seen that the units) are all optimal.

As another example, if the total heating operation load for the indoor unit of the heating operation is not greater than the total cooling operation load for the indoor unit of the cooling operation, the opening degree of the outdoor electric expansion valve 102 is set to the second set opening value. . Here, the second set opening value is stored in advance as data obtained through a test. As shown in FIG. 4, the indoor temperature is 27 ° C. (excl. When tested at / 10 ° C (humidity including temperature), when the second set opening value for the outdoor-side electric expansion valve 102 is set to 35% (B), the performance of the indoor unit of the cooling operation and the performance of the entire operating indoor unit It can be seen that both (including indoor units for heating and cooling) are optimal.

After the control of the discharged refrigerant, the outdoor control unit 120 compares the outdoor temperature with the set reference temperature, sets the compression capacity of the compressor according to the comparison result, and drives the compressor based on the set compression capacity. For example, if the outdoor temperature is greater than the reference temperature, the compressor is driven according to the first compression capacity. If the outdoor temperature is not greater than the reference temperature, the compressor is driven according to the second compression capacity less than the first compression capacity. This is to set the compression capacity of the compressor.

After setting the compression capacity of the compressor, the outdoor control unit 120 compares the discharge pressure of the compressor and the set reference pressure in the state of driving the compressor according to the set compression capacity to control the speed of the outdoor fan according to the comparison result. . For example, if the discharge pressure of the compressor falls between the lower limit value and the upper limit value of the reference pressure, the current compressor operation is maintained. On the other hand, if the discharge pressure of the compressor is higher than the upper limit of the reference pressure, the speed of the outdoor fan is increased to increase the heat exchange capacity, and if the discharge pressure is lower than the lower limit of the reference pressure, the discharge pressure is decreased by reducing the speed of the outdoor fan. By increasing this, the discharge pressure of the compressor satisfies the reference pressure.

A control method of the air conditioner according to the present invention having the above configuration will be described with reference to the accompanying drawings.

5A and 5B are flowcharts of the control method of the air conditioner according to the present invention, and heating operation for one indoor unit 200a and cooling operation for three indoor units 200a, 200b, 200c, and 200d. This is an example of a case where the cooling subjects are operated simultaneously.

First, when power is supplied to the air conditioner, the outdoor controller 120 performs initialization (10). The initialization process refers to a processing operation performed according to a predetermined control program such as driving a compressor and controlling the operation of each valve.

After the initialization, each indoor control unit provides the outdoor control unit with the operation mode signal for distinguishing the operation mode set for the indoor unit among the heating operation mode or the cooling operation mode. The outdoor controller 120 receives a driving mode signal to each indoor controller and recognizes a driving mode of each indoor unit (12).

The outdoor controller 120 determines whether the number Nc of the indoor units set for the cooling operation is greater than the number Nh of the indoor units set for the heating operation (14).

If the number Nc of the indoor units set for the cooling operation is not greater than the number Nh of the indoor units set for the heating operation, the air conditioner is operated according to the corresponding operation mode (15).

If the number of operating units Nc of the indoor unit set for the cooling operation is larger than the number of operating units Nh of the indoor unit set for the heating operation, the four-way valve 104 is switched and the on-off valve 109 is switched for the simultaneous cooling and cooling operation. Open. Accordingly, the refrigerant discharged from the compressor can be sent to the indoor unit for cooling operation through the outdoor heat exchangers 101a and 101b and the outdoor electric expansion valve 102 which act as condensers, and some of the refrigerant discharged to the outdoor heat exchanger. By bypassing the devices (101a, 101b) to be sent to the indoor unit to bypass the heating operation (16).

Each indoor control unit calculates an operating load of the corresponding indoor unit, that is, the heating indoor unit or the cooling indoor unit, based on the difference between the indoor temperature and the set temperature, and provides the outdoor control unit with information about the calculated operating load. The outdoor control unit 120 receives an operation load for the corresponding indoor unit to each indoor control unit (18).

The outdoor control unit 120 determines whether the total heating operation load LTh for the indoor unit of the heating operation provided to each indoor control unit is greater than the total cooling operation load LTc for the indoor unit of the cooling operation (20). If the heating operation load LTh is large, the opening degree Vo of the outdoor-side electric expansion valve 102 is set to the first set opening value V1 (22). On the other hand, if the total heating operation load LTh for the indoor unit of the heating operation provided to each indoor control unit is not greater than the total cooling operation load LTc for the indoor unit of the cooling operation, the opening degree of the outdoor electric expansion valve 102 is (Vo) is set to the second set opening value V2 (22). Here, the first set opening value V1 and the second set opening value V2 are stored in advance as data obtained through a test.

The outdoor controller 120 controls the opening degree by driving the outdoor-side electric expansion valve according to the first set opening value V1 or the second set opening value V2 (26).

After the control of the opening degree of the outdoor electric expansion valve is finished, the outdoor temperature is received by receiving the outdoor detection signal through the outdoor temperature sensor 108 (28).

The outdoor controller 120 determines whether the detected outdoor temperature Mo is greater than the set reference temperature Mr (S30). In this embodiment, the reference temperature Mr is set to 0 ° C.

If the outdoor temperature Mo is greater than the reference temperature Mr, the outdoor control unit 120 sets the compressor's compression capacity CP to the first compression capacity CP1 (32).

The outdoor controller 120 drives the compressor according to the set first compression capability (34), receives the refrigerant discharge pressure detection signal through the pressure sensor 105, and recognizes the pressure of the discharge refrigerant (36).

The outdoor control unit 120 determines whether the detected discharge pressure Pd falls between the lower limit value P1 and the upper limit value P2 of the first reference pressure (38). If the lower limit value P1 or the upper limit value P2 is equal to or lower than the first reference pressure, the speed of the outdoor fan 113 is adjusted to adjust the discharge pressure (40). If the discharge pressure of the compressor is higher than the upper limit value, the speed of the outdoor fan 113 is increased to increase the heat exchange capacity, so that the discharge pressure is lowered. To do that. At this time, the outdoor controller controls the outdoor fan 113 based on the speed of the outdoor fan 113 detected by the speed sensor. When the adjustment of the outdoor fan 113 is finished, the operation proceeds to operation 36.

If the outdoor temperature Mo is not greater than the reference temperature Mr as a result of operation 30, the outdoor control unit 120 may reduce the compression capacity CP of the compressor to the second compression capacity CP2 smaller than the first compression capacity CP1. (42). This is to increase the operating performance of the air conditioner by setting the compression capacity of the compressor according to the outdoor temperature.

The outdoor control unit 120 drives the compressor according to the set second compression capacity (44), recognizes the pressure of the discharged refrigerant through the pressure sensor 105 (46), and the detected discharge pressure (Pd) is the second reference It is determined whether the pressure falls between the lower limit value P11 and the upper limit value P12 (48).

If the detected discharge pressure Pd is less than or equal to the lower limit value P11 or greater than or equal to the upper limit value P12 of the second reference pressure, the speed of the outdoor fan 113 is adjusted to adjust the discharge pressure (50). If the discharge pressure of the compressor is higher than the upper limit value, the speed of the outdoor fan 113 is increased to increase the heat exchange capacity, so that the discharge pressure is lowered. To do that. After the adjustment of the outdoor fan 113, the operation proceeds to operation 46.

When the discharge pressure Pd detected in operation 38 falls between the lower limit value P1 and the upper limit value P1 of the first reference pressure, or the discharge pressure Pd detected in operation 48 is the lower limit value P11 of the second reference pressure. If the value falls within the upper limit value P12, the outdoor controller 120 determines whether the operation is stopped (52), and if the determination is not an operation stop, the outdoor controller 120 proceeds to operation 12 in order to continuously perform simultaneous cooling and cooling / cooling operations.

When the operation 50 determines that the operation is stopped, the compressor is turned off. In addition, the driving unit such as the outdoor fan 113 is turned off to finish the operation of the air conditioner.

As described above, the present invention accurately reflects the operating load of a changing indoor unit because the amount of refrigerant flowing from the compressor to the indoor unit is controlled in response to the operating load of the indoor unit in the multi-air conditioner in which multiple indoor units are connected to the outdoor unit. Can be. Therefore, the present invention satisfies both the performance of the cooling operation and the performance of the heating operation when performing the simultaneous heating and cooling operation can exhibit a good operating performance. The present invention can set the compression capacity of the compressor according to the outdoor temperature and maintain the capacity of the compressor in response to the outdoor load by controlling the speed of the outdoor fan according to the discharge pressure of the compressor.

Claims (19)

A plurality of indoor units each having an indoor side heat exchanger; An outdoor unit having a compressor, an outdoor heat exchanger, an outdoor electric expansion valve, and an opening / closing valve having an inlet connected between the compressor and an outdoor heat exchanger and an outlet connected to the indoor unit side; The amount of refrigerant discharged from the compressor flowing through the on / off valve from the compressor to the indoor unit according to the operating load of the indoor unit, and from the compressor to the indoor unit through the outdoor heat exchanger and the outdoor electric expansion valve And a control unit for controlling the discharge refrigerant amount of the flowing compressor, wherein the control unit includes an indoor control unit for providing an operation load of the indoor unit for cooling operation or heating operation, and the operation load according to the operation load provided from the indoor control unit. It includes an outdoor control unit for controlling the opening and closing of the on-off valve and the opening degree of the outdoor-side electric expansion valve, wherein the outdoor control unit is the overall operation including the performance of the indoor unit to operate the cooling operation and cooling operation and heating operation in the case of simultaneous operation of the cooling subject air conditioning Even if the performance of the indoor unit is satisfactory An air conditioner, characterized in that for setting the opening degree of the outdoor expansion valve. delete  The method of claim 1, And the outdoor expansion valve is connected to an outlet of the outdoor heat exchanger. The method of claim 1, And the control unit controls the on-off valve and the outdoor electric expansion valve to adjust the amount of refrigerant. delete delete The method of claim 1, The indoor unit further includes an indoor temperature sensor, wherein the indoor control unit calculates an operating load according to a difference between an indoor temperature and a set temperature of the indoor unit. The method of claim 1, The outdoor controller compares the total heating operation load of the indoor unit for heating operation with the total cooling operation load of the indoor unit for cooling operation and sets the opening degree of the outdoor expansion valve according to a comparison result. . A plurality of indoor units each having an indoor temperature sensor and an indoor side heat exchanger; A compressor, an outdoor side heat exchanger, an outdoor side expansion valve, an opening valve connected between the compressor and the outdoor side heat exchanger and an outlet connected to the indoor unit side, an outdoor fan, an outdoor temperature sensor, and a pressure sensor Outdoor unit; An indoor control unit for calculating an operating load of the indoor unit and providing the calculated operating load according to a difference between an indoor temperature and a set temperature detected by the indoor temperature sensor; And It controls the opening and closing of the on-off valve and the opening degree of the outdoor-side expansion valve in accordance with the operating load provided from the indoor control unit, and at the same time setting the compression capacity of the compressor in accordance with the outdoor temperature detected by the outdoor temperature sensor And an outdoor controller for controlling the speed of the outdoor fan according to the discharge pressure of the compressor detected by the pressure sensor when driving the compressor according to a set compression capacity. 10. The method of claim 9, And the outdoor controller sets the compressor's compression capacity as the outdoor temperature detected is higher. The method of claim 10, And the outdoor control unit increases the speed of the outdoor fan to decrease the discharge pressure of the compressor and decreases the speed of the outdoor fan to increase the discharge pressure of the compressor. The method of claim 11, And a speed sensor for detecting a speed of the outdoor fan, wherein the outdoor controller controls the outdoor fan based on the speed of the outdoor fan detected by the speed sensor. An outdoor unit having an compressor, an outdoor side heat exchanger, an outdoor side electric expansion valve, an outdoor unit having an inlet valve connected between the compressor and the outdoor side heat exchanger and an outlet connected to the indoor unit side, and an indoor side heat exchanger, respectively. In a control method of an air conditioner having a plurality of indoor units, Calculating the operating load of the indoor unit, and the amount of refrigerant discharged from the compressor flowing through the on / off valve from the compressor to the indoor unit according to the calculated operating load, and the outdoor heat exchanger and outdoor electric expansion in the compressor; And controlling the amount of refrigerant discharged from the compressor passing through the valve to the indoor unit. The method of claim 13, The operation load of the indoor unit is calculated according to the difference between the room temperature and the set temperature of the indoor unit. The method of claim 13, The operation load calculates the total cooling operation load of the indoor unit for cooling operation and the total heating operation load of the indoor unit for heating operation and compares the total heating operation load with the total cooling operation load, respectively. And controlling the opening and closing of the on-off valve and the opening degree of the outdoor side electric expansion valve according to the comparison result. The method of claim 15, The opening degree control of the outdoor electric expansion valve is characterized in that the air conditioner to satisfy both the performance of the indoor unit for the cooling operation and the performance of the entire operation indoor unit including the cooling operation and heating operation when the cooling subject air conditioning and heating at the same time Control method. The method of claim 13, After the control of the amount of refrigerant, the outdoor temperature sensor using the outdoor temperature sensor provided in the outdoor unit, the control method of the air conditioner, characterized in that for setting the compression capacity of the compressor according to the detected outdoor temperature. The method of claim 17, When driving the compressor according to the set compression capacity, the control of the air conditioner, characterized in that for detecting the discharge pressure of the compressor and controlling the speed of the outdoor fan provided in the outdoor unit according to the detected discharge pressure of the compressor Way. The method of claim 18, The control of the speed of the outdoor fan compares the discharge pressure of the compressor with the set reference pressure.As a result of the comparison, if the discharge pressure of the compressor is large, the speed of the outdoor fan is increased, and if the discharge pressure of the compressor is less than the reference pressure, And if the discharge pressure of the compressor is smaller than the reference pressure, the speed of the outdoor fan is reduced.
KR20030073328A 2003-10-21 2003-10-21 Air Conditioner And Control Method Thereof KR101003356B1 (en)

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KR20030073328A KR101003356B1 (en) 2003-10-21 2003-10-21 Air Conditioner And Control Method Thereof
CNB2004100022859A CN1324272C (en) 2003-10-21 2004-01-16 Air conditioner and method for controlling the same
EP20040250231 EP1526341B1 (en) 2003-10-21 2004-01-17 Multi-unit air conditioner and method for controlling the same
DE200460001501 DE602004001501T2 (en) 2003-10-21 2004-01-17 Multi-zone air conditioning system and method for controlling the same
JP2004016196A JP3857274B2 (en) 2003-10-21 2004-01-23 Air conditioner and control method thereof

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KR20050038115A (en) 2005-04-27
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EP1526341B1 (en) 2006-07-12

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