GB2517023A - Air-conditioning apparatus - Google Patents

Air-conditioning apparatus Download PDF

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Publication number
GB2517023A
GB2517023A GB1408552.6A GB201408552A GB2517023A GB 2517023 A GB2517023 A GB 2517023A GB 201408552 A GB201408552 A GB 201408552A GB 2517023 A GB2517023 A GB 2517023A
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GB
United Kingdom
Prior art keywords
indoor
temperature
rotation speed
compressor
control device
Prior art date
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Granted
Application number
GB1408552.6A
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GB201408552D0 (en
GB2517023B (en
Inventor
Shoichi Aoki
Kiyoshi Yoshimura
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication of GB201408552D0 publication Critical patent/GB201408552D0/en
Publication of GB2517023A publication Critical patent/GB2517023A/en
Application granted granted Critical
Publication of GB2517023B publication Critical patent/GB2517023B/en
Expired - Fee Related legal-status Critical Current
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/56—Remote control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/76—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by means responsive to temperature, e.g. bimetal springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • 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
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • 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
    • F25B2313/0293—Control issues related to the indoor 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2600/01—Timing
    • 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
    • F25B2600/021—Inverters therefor
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/02—Humidity
    • 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
    • F25B2700/171—Speeds of the compressor
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Mathematical Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

An air-conditioning apparatus includes an outdoor unit 10 including a compressor 11, an outdoor heat exchanger 13, an expansion device 14, and an outdoor fan 15 which blows air to the outdoor heat exchanger, and an indoor unit 20 including an indoor heat exchanger 21 and an indoor fan 22 which blows air to the indoor heat exchanger, and in which the compressor, the outdoor heat exchanger, the expansion device, and the indoor heat exchanger are sequentially connected by a refrigerant pipe 18 to form a refrigerant circuit. An indoor control device 23 calculates a value ΔT of a temperature difference between an indoor temperature TR detected by a room temperature sensor 24 and a preset indoor temperature TS set by an operation on a remote controller, and determines the rotation speed N of an indoor fan in an indoor unit on the basis of the calculated value ΔT of the temperature difference and the operating frequency Q of the compressor in the outdoor unit 10.

Description

[Name of Document] DESCRIPTION
[Title of Invention] AIR-CONDITIONING APPARATUS
[Technical Field]
[0001] The present invention relates to an air-conditioning apparatus, and more specifically, to an air-conditioning apparatus which controls the air flow rate of an indoor fan provided in an indoor unit.
[Background Art]
[0002] Generally, it is demanded for an air-conditioning apparatus to obtain an optimum air-conditioning capacity corresponding to the indoor temperature or the outlet air temperature, to cause the indoor temperature or the outlet air temperature to converge smoothly into a preset indoor temperature, to obtain an optimal, and necessary and sufficient outlet air flow rate which corresponds to the air-conditioning capacity, to avoid an increase in unnecessary power consumption, and to stabilize a refrigeration cycle.
[0003] As a way to achieve the above, a technique for calculating the air outlet temperature and the outlet air flow rate of an indoor unit which enable the indoor environment to become comfortable, on the basis of the difference between the indoor temperature and a preset indoor temperature, setting the temperature of an indoor heat exchanger and the air flow rate of an indoor fan to the calculated values, and controlling the operating frequency of a compressor and the rotation speed of the indoor fan to be in the set state, exists (see, for example, Patent Literature 1).
[0004] Furthermore, a technique for operating the operating frequency of a compressor that is, the capacity of the compressor, in accordance with the difference between the inlet air temperature of an indoor unit detected by a room temperature sensor and a preset indoor temperature, and setting the air flow rate of an indoor fan to a value corresponding to the operating frequency, exists (see, for example, Patent Literature 2).
[Citation List] [Patent Literature] [0005] [Patent Literature 1] Japanese Unexamined Patent Application Publication No. 08-285353 (Abstract) [Patent Literature 2] Japanese Unexamined Patent Application Publication No. 10-096545 (Abstract)
[Summary of Invention]
[Technical Problem] [0006] However, with the technique described in Patent Literature 1, three-stage control steps including calculating the air outlet temperature and the outlet air flow rate of the indoor unit, setting the temperature of the indoor heat exchanger and the air flow rate of the indoor fan, and then controlling the operating frequency of the compressor and the rotation speed of the indoor fan, are required. Therefore, a delay in the response to excess or shortage of the air- conditioning capacity occurs. In the case where the response to the air-conditioning capacity is delayed, the air flow rate of the indoor fan will increase or decrease, and on the contrary, this may cause discomfort.
[0007] Moreover, with the technique described in Patent Literature 2, two-stage control steps including operating the operating frequency of the compressor, and then setting the air flow rate of the indoor fan, are required. Therefore, there is a problem that a delay in the response to excess or shortage of the air-conditioning capacity occurs.
[0008] The present invention has been made in order to solve the above- mentioned problems. An object of the present invention is to obtain an air-conditioning apparatus which achieves energy saving without the air-conditioning capacity being insufficient and which is capable of quickly responding to excess or shortage of the air-conditioning capacity and controlling the air flow rate of an indoor fan.
[Solution to Problem] [0009] An air-conditioning apparatus according to the present invention including an outdoor unit including a compressor, an outdoor heat exchanger, an expansion device, and an outdoor fan which blows air to the outdoor heat exchanger, and an indoor unit including an indoor heat exchanger and an indoor fan which blows air to the indoor heat exchanger, and in which the compressor, the outdoor heat exchanger, the expansion device, and the indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigerant circuit, includes a room temperature sensor which detects an indoor temperature; and a controller which calculates a value of a temperature difference between the indoor temperature detected by the room temperature sensor and a preset indoor temperature and determines a rotation speed of the indoor fan on the basis of the calculated value of the temperature difference and an operating frequency of the compressor.
[Advantageous Effects of Invention] [0010] According to the present invention, the value of a temperature difference between an indoor temperature detected by a room temperature sensor and a preset indoor temperature is calculated, and the rotation speed of an indoor fan is determined on the basis of the calculated value of the temperature difference and the operating frequency of a compressor As described above, the operating frequency of the compressor is used directly as data to be controlled when determining the rotation speed of the indoor fan. Therefore, a quick response may be made to excess or shortage of the air-conditioning capacity.
Furthermore, as described above, the rotation speed of the indoor fan is determined on the basis of the value of the temperature difference and the operating frequency of the compressor Therefore, the rotation speed of the indoor fan may be maintained low. Thus, energy saving of the input power of the indoor fan may be achieved. In accordance with this, air-sending sound of the indoor fan may be reduced.
[Brief Description of Drawings]
[0011] [Fig. 1] Fig. 1 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 1.
[Fig. 2] Fig. 2 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 1.
[Fig. 3] Fig. 3 is a diagram illustrating the rotation speed of an indoor fan according to the correlation between the operating frequencies of a compressor and the value of a temperature difference.
[Fig. 4] Fig. 4 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 2.
[Fig. 5] Fig. 5 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 2.
[Fig. 6] Fig. 6 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 3.
[Fig. 7] Fig. 7 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 3.
[Description of Embodiments]
[0012] Embodiment 1.
Fig. 1 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 1.
The air-conditioning apparatus of Embodiment 1 includes an outdoor unit and an indoor unit 20. The outdoor unit 10 includes a compressor 11, a four-way valve 12, an outdoor heat exchanger 13, an electronic expansion valve 14, an outdoor fan 15 which sends outdoor air to the outdoor heat exchanger 13] an outdoor control device 16, an inverter 17 which generates the operating frequency of the compressor 11 under the control of the outdoor control device 16, and the like. The indoor unit 20 includes an indoor heat exchanger 21, an indoor fan 22 which sends indoor air to the indoor heat exchanger 21, an indoor control device 23 (controller), a room temperature sensor 24 which detects the indoor temperature, and the like. The refrigerant circuit of the air-conditioning apparatus is configured such that the compressor 11, the four-way valve 12, the outdoor heat exchanger 13, the electronic expansion valve 14 (expansion device), the indoor heat exchanger 21, and the like are sequentially connected by a refrigerant pipe 18.
[0013] The four-way valve 12 described above is a valve for switching the refrigeration cycle between cooling and heating. When the refrigeration cycle is switched to a cooling operation, the outdoor heat exchanger 13 acts as a condenser and the indoor heat exchanger 21 acts as an evaporator. When the refrigeration cycle is switched to a heating operation, the indoor heat exchanger 21 acts as a condenser and the outdoor heat exchanger 13 acts as an evaporator. The room temperature sensor 24 is placed on the suction side of the indoor fan 22 within the indoor unit 20.
[0014] The outdoor control device 16 controls the capacity (the discharge amount of the refrigerant) of the compressor 11 so that an indoor temperature TR becomes a preset indoor temperature T6. That is, the inverter 17 is controlled so that the operating frequency serving as the corresponding capacity is output to the compressor 11. Furthermore, the outdoor control device 16 controls the opening degree of the electronic expansion valve 14 so that the refrigerant subcooling degree at the exit of the outdoor heat exchanger 13 becomes a target value during a cooling operation, and controls the opening degree of the electronic expansion valve 14 so that the refrigerant subcooling degree at the exit of the indoor heat exchanger 21 becomes a target value during a heating operation.
[0015] The indoor control device 23 transmits operation information to the outdoor control device 16 and starts the operation of the indoor fan 22, when receiving an instruction to start the operation (cooling or heating) by an operation of a remote controller. The indoor control device 23 reads the indoor temperature TR detected by the room temperature sensor 24 and the preset indoor temperature T set by an operation of the remote controller, and transmits the temperature information to the outdoor control device 16. Furthermore, the indoor control device 23 calculates a value AT of a temperature difference between the indoor temperature TR and the preset indoor temperature T. and determines the rotation speed N of the indoor fan 22 on the basis of the calculated value AT of the temperature difference and the operating frequency Q of the compressor 11. The determination of the rotation speed N will be described later.
[0016] Here, the flow of the refrigerant during a cooling operation and a heating operation in the air-conditioning apparatus configured as mentioned above, will be explained.
During a cooling operation, the refrigerant becomes a high-temperature and high-pressure gas refrigerant by being compressed by the compressor 11, and flows into the outdoor heat exchanger 13 via the four-way valve 12. Then, in the outdoor heat exchanger 13, the gas refrigerant exchanges heat (rejects heat) with the outdoor air from the outdoor fan 15 and becomes a high-pressure liquid refrigerant. After that, the liquid refrigerant is expanded to a specific pressure by the electronic expansion valve 14, becomes a low-pressure, two-phase gas-liquid refrigerant, and flows into the indoor heat exchanger 21. The two-phase gas-liquid refrigerant which has entered the indoor heat exchanger 21 exchanges heat (removes heat) with the indoor air from the indoor fan 22, becomes a low-temperature and low-pressure gas refrigerant, and returns to the compressor 11 via the four-way valve 12.
[0017] During a heating operation, the refrigerant also becomes a high-temperature and high-pressure gas refrigerant as mentioned above by being compressed by the compressor 11, and flows into the indoor heat exchanger 21 via the four-way valve 12. In the indoor heat exchanger 21, the gas refrigerant exchanges heat (rejects heat) with the indoor air from the indoor fan 22, and becomes a high-pressure liquid refrigerant. Then, the liquid refrigerant is expanded to a specific pressure by the electronic expansion valve 14, becomes a low-pressure, two-phase gas-liquid refrigerant, and flows into the outdoor heat exchanger 13. The two-phase gas-liquid refrigerant which has entered the outdoor heat exchanger 13 exchanges heat (removes heat) with the outdoor air from the outdoor fan 15, becomes a low-temperature and low-pressure gas refrigerant, and returns to the compressor 11 via the four-way valve 12.
[0018] Next, an operation for determining the rotation speed of the indoor fan 22 will be explained, based on Figs. 2 and 3.
Fig. 2 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 1, and Fig. 3 is a diagram illustrating the rotation speed of the indoor fan according to the correlation between the operating frequency of the compressor and the value of a temperature difference.
[0019] The horizontal axis illustrated in Fig. 3 represents the operating frequency 0 of the compressor 11, and the vertical axis represents the value AT of the temperature difference between the indoor temperature T and the preset indoor temperature T5. The operating frequency 0 is categorized into four ranges: a range lower than or equal to 01, a range higher than 01 and lower than or equal to 02, a range higher than 02 and lower than or equal to 03, and a range higher than 03. The value AT of the temperature difference is categorized into a range smaller than or equal to Ti, a range greater than Ti and smaller than or equal to 12, a range greater than T2 and smaller than or equal to T3, and a range greater than T3 and smaller than or equal to T4. Regarding the rotation speed N of the indoor fan 22 determined based on the operating frequency 0 and the value AT of the temperature difference, LL represents extremely low speed, Low represents low speed, Mid represents medium speed, and Hi represents high speed. Data in Fig. 3 is arranged in advance as a data table in the indoor control device 23.
[0020] When an instruction to start a cooling operation or a heating operation is input from the remote controller, the indoor control device 23 transmits the operation information to the outdoor control device 16 to cause the outdoor unit to operate, and starts the operation of the indoor fan 22. Then, the indoor control device 23 reads the indoor temperature TR detected by the room temperature sensor 24 (Si 0), and reads the preset indoor temperature T3 set by an operation on the remote controller (Sii). The indoor control device 23 calculates the value AT of the temperature difference between the read indoor temperature TR and preset indoor temperature T5 (Si 2), and reads the operating i5 frequency Q of the compressor 11 from the outdoor control device 16 (Si3).
[0021] After reading the operating frequency Q of the compressor 11, the indoor control device 23 determines the rotation speed N of the indoor fan 22 by referring to the data table, on the basis of the operating frequency 0 and the calculated value AT of the temperature difference (Si 4). For example, when the operating frequency 0 of the compressor is higher than 03 and the value AT of the temperature difference is within a range greater than T2 and smaller than or equal to T3, the indoor control device 23 sets the rotation speed N of the indoor fan 22 to Hi. Then, the indoor control device 23 reads the angle of a louver for changing the air-sending direction upwards or downwards (S15), and controls the angle of the louver read in accordance with the rotation speed N of the indoor fan 22(Si6).
[0022] For example, the indoor control device 23 controls the angle of the louver so that the angle of the louver becomes horizontal to the floor surface, in the case where the angle of the louver faces downwards when the rotation speed N of the indoor fan 22 represents Hi. Furthermore, in the case where the angle of the louver is horizontal to the floor surface when the rotation speed N of the indoor fan 22 represents Hi, the indoor control device 23 maintains the current state. Then, the indoor control device 23 operates fort minutes, maintaining the determined rotation speed N (Hi) of the indoor fan 22 and the angle of the louver set according to the rotation speed N of the indoor fan 22 (Si 7). In the case where the rotation speed N of the indoor fan 22 represents Mid, the louver is made tilted downwards by a predetermined angle. In the case where the rotation speed N represents Low, the louver is made tilted further downwards by a predetermined angle. In the case where the rotation speed N represents LL, the louver is made tilted towards substantially a vertical direction.
[0023] After t minutes have passed, the indoor control device 23 returns to Sb and repeats the series of operations described above. That is, the indoor control device 23 determines the rotation speed N of the indoor fan 22 in accordance with the value AT of the temperature difference between the read indoor temperature TR and preset indoor temperature I and the operating frequency 0 of the compressor ii controlled by the outdoor control device 16. In the case where the operating frequency 0 of the compressor ii does not change and is higher than 03 and the value AT of the temperature difference is within a range greater than Ti and smaller than or equal to T2, the rotation speed N of the indoor fan 22 is switched from Hi to Mid. Furthermore, in the case where the operating frequency 0 of the compressor ii is higher than 02 and lower than or equal to 03 and the value AT of the temperature difference is smaller than or equal to Ti, the rotation speed N of the indoor fan 22 is switched from Hi to Low.
[0024] As described above, in Embodiment i, the value AT of the temperature difference between the indoor temperature T and the preset indoor temperature This calculated, and the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor ii. By causing the operating frequency Q of the compressor ii to be data to be controlled directly when determining the rotation speed N of the indoor fan 22, a quick response may be made to excess or shortage of the air-conditioning capacity.
Furthermore, since the value AT of the temperature difference between the indoor temperature TR and the preset indoor temperature T5 is calculated and the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor ii, the rotation speed N of the indoor fan 22 may be maintained low.
Accordingly, energy saving of the input power of the indoor fan 22 may be achieved, and in accordance with this, air-sending sound of the indoor fan 22 may be reduced.
[0025] Embodiment 2.
Fig. 4 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 2. Parts similar to those in Embodiment i described with reference to Fig. 1 are represented with the same reference numerals, and only the parts different from Embodiment i will be explained.
In the air-conditioning apparatus according to Embodiment 2, a floor temperature sensor 25 which detects the indoor floor temperature TF, as well as the room temperature sensor 24, is arranged in the indoor unit 20. The floor temperature sensor 25 is1 for example, arranged at the front face of the indoor unit 20, and includes an infrared sensor which detects the floor temperature TF from infrared rays radiated from the floor surface.
[0026] The indoor control device 23 (controller) of the indoor unit 20 in Embodiment 2 corrects the indoor temperature TR detected by the room temperature sensor 24, in accordance with the floor temperature TE detected by the floor temperature sensor 25, to obtain a first-correction indoor temperature TR1* The indoor control device 23 calculates the value AT of the temperature difference between the first-correction indoor temperature Ti and a preset indoor temperature T5, and determines the rotation speed N of the indoor fan 22 on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor 11. In the indoor control device 23, as well as the data table described above, a first-correction data table is arranged, in which the floor temperature TF and a correction value set according to the floor temperature TF for correction of the indoor temperature TR are described. The correction value is set in such a manner that the indoor temperature TR decreases as the floor temperature TE increases.
[0027] Next, an operation for determining the rotation speed of the indoor fan 22 will be explained, with reference to Fig. 5.
Fig. 5 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 2.
[0028] When an instruction to start a cooling operation or a heating operation is input from the remote controller, the indoor control device 23 transmits the operation information to the outdoor control device 16 to cause the outdoor unit to operate, and starts the operation on the indoor fan 22. After that, the indoor control device 23 reads the indoor temperature TR detected by the room temperature sensor 24 (S20), reads the indoor floor temperature TF detected by the floor temperature sensor 25 (S21), and reads the preset indoor temperature Is set by an operation of the remote controller (S22). The indoor control device 23 selects a correction value which is set in accordance with the floor temperature TF from the first-correction data table, corrects the read indoor temperature TR on the basis of the correction value to obtain a first-correction indoor temperature TR1 (S23). The indoor control device 23 calculates the value AT of the temperature difference between the corrected first-correction indoor temperature TR1 and the preset indoor temperature T5 (S24), and reads the operating frequency 0 of the compressor 11 from the outdoor control device 16 (S25).
[0029] After reading the operating frequency 0 of the compressor 11, the indoor control device 23 determines the rotation speed N of the indoor fan 22 by referring to the data table, on the basis of the operating frequency 0 and the calculated value AT of the temperature difference (S26). For example, when the operating frequency 0 of the compressor is higher than Q3 and the value AT of the temperature difference is within a range greater than Ti and smaller than or equal to T2, the indoor control device 23 sets the rotation speed N of the indoor fan 22 to Mid. Then, the indoor control device 23 reads the angle of the louver for changing the air-sending direction upwards or downwards (S27), and controls the read angle of the louver in accordance with the rotation speed N of the indoor fan 22 (S28).
[0030] For example, the indoor control device 23 controls the angle of the louver so that the angle of the louver is made tilted downwards by a predetermined angle in the case where the angle of the louver is horizontal to the floor surface when the rotation speed N of the indoor fan 22 represents Mid. Then, the indoor control device 23 operates fort minutes, maintaining the determined rotation speed N (Mid) of the indoor fan 22 and the angle of the louver set according to the rotation speed N of the indoor fan 22 (S29). The angle of the louver against the rotation speed N of the indoor fan 22 is similar to that in Embodiment 1.
[0031] After t minutes have passed, the indoor control device 23 returns to S20 and repeats the series of operations described above. That is, the indoor control device 23 determines the rotation speed N of the indoor fan 22, on the basis of the value AT of the temperature difference between the first-correction indoor temperature TR1, which has been obtained by correcting the indoor temperature TR in accordance with the floor temperature TF, and the preset indoor temperature T5, and on the basis of the operating frequency 0 of the compressor 11 controlled by the outdoor control device 16. In the case where the operating frequency 0 of the compressor 11 does not change and is higher than 03 and the value AT of the temperature difference is smaller than or equal to Ti, the rotation speed N of the indoor fan 22 is maintained at Mid. Furthermore, in the case where the operating frequency 0 of the compressor 11 is higher than 02 and lower than or equal to 03 and the value AT of the temperature difference is smaller than or equal to Ti, the rotation speed N of the indoor fan 22 is switched from Mid to Low.
[0032] As described above, in Embodiment 2, the indoor temperature R is corrected according to the floor temperature TF to obtain the first-correction indoor temperature TR1, the value AT of the temperature difference between the first-correction indoor temperature T1 and the preset indoor temperature Ts is calculated, and the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor 11. By taking the floor temperature TE into account as data to be controlled when determining the rotation speed N of the indoor fan 22, a room temperature closer to a comfortable indoor space may be set.
[0033] Embodiment 3.
Fig. 6 is a refrigerant circuit diagram illustrating a schematic configuration of an air-conditioning apparatus according to Embodiment 3. Parts similar to those in Embodiment 2 described with reference to Fig. 4 are represented with the same reference numerals, and only the parts different from Embodiment 2 will be explained.
In the air-conditioning apparatus according to Embodiment 3, a humidity sensor 26 which detects the indoor humidity, as well as the room temperature sensor 24 and the floor temperature sensor 25, is arranged in the indoor unit 20.
The humidity sensor 26 is, for example, arranged at the front face of the indoor unit 20.
[0034] The indoor control device 23 (controller) corrects the indoor temperature TR detected by the room temperature sensor 24, in accordance with the floor temperature TF detected by the floor temperature sensor 25, to obtain a first-correction indoor temperature TR1. Furthermore, in accordance with a humidity TH detected by the humidity sensor 26, the indoor control device 23 corrects the first-correction indoor temperature Ti to obtain a second-correction indoor temperature TR2, calculates the value AT of the temperature difference between the second-correction indoor temperature TR2 and a preset indoor temperature and determines the rotation speed N of the indoor fan 22 on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor 11. In the indoor control device 23, as well as the data table and the first-correction data table described above, a second-correction data table is arranged, in which the humidity TH and a correction value set according to the humidity TH for correction of the first-correction indoor temperature Ti are described. The correction value is set in such a manner that the indoor temperature TR decreases as the humidity 11 increases.
[0035] Next, an operation for determining the rotation speed of the indoor fan 22 will be explained, based on Fig. 7.
Fig. 7 is a flowchart illustrating an operation of the air-conditioning apparatus according to Embodiment 3.
[0036] When an instruction to start a cooling operation or a heating operation is input from the remote controller, the indoor control device 23 transmits the operation information to the outdoor control device 16 to cause the outdoor unit to operate, and starts the operation of the indoor fan 22. After that, the indoor control device 23 reads the indoor temperature TR detected by the room temperature sensor 24 (S30), and reads the indoor floor temperature TF detected by the floor temperature sensor 25 (S31). Furthermore, the indoor control device 23 reads the humidity TH detected by the humidity sensor 26 (S32), and reads the preset indoor temperature T8 set by an operation on the remote controller (S33).
[0037] Then, the indoor control device 23 selects a correction value set according to the floor temperature Tr from the first-correction data table, corrects the read indoor temperature TR on the basis of the correction value to obtain the first-correction indoor temperature TR1 (S34). Then, the indoor control device 23 selects a correction value set according to the humidity TH from the second-correction data table. Based on the correction value, the first-correction indoor temperature TR1, which has been obtained by earlier correction, is further corrected to obtain a second-correction indoor temperature TR2 (S35). After that, the indoor control device 23 calculates the value AT of the temperature difference between the second-correction indoor temperature TR2 and the preset indoor temperature T5 (S36), and reads the operating frequency 0 of the compressor 11 from the outdoor control device 16 (S37).
[0038] After reading the operating frequency 0 of the compressor 11, the indoor control device 23 determines the rotation speed N of the indoor fan 22 by referring to the data table, on the basis of the operating frequency 0 and the calculated value AT of the temperature difference (S38). For example, in the case where the operating frequency 0 of the compressor is higher than 03 and the value AT of the temperature difference is greater than Ti and smaller than or equal to T2, the indoor control device 23 sets the rotation speed N of the indoor fan 22 to Mid. Then, the indoor control device 23 reads the angle of the louver for changing the air-sending direction upwards or downwards (S39), and controls the read angle of the louver in accordance with the rotation speed N of the indoor fan 22 (S40).
[0039] As described above, the indoor control device 23 controls the angle of the louver so that the louver is made tilted downwards by a predetermined angle in the case where the angle of the louver is horizontal to the floor surface when the rotation speed N of the indoor fan 22 represents Mid. Then, the indoor control device 23 operates fort minutes, maintaining the determined rotation speed N (Mid) of the indoor fan 22 and the angle of the louver set according to the rotation speed N of the indoor fan 22 (S41). The angle of the louver against the rotation speed N of the indoor fan 22 is similar to that in Embodiment 1.
[0040] After t minutes have passed, the indoor control device 23 returns to S30 and repeats the series of operations described above. That is, the indoor control device 23 determines the rotation speed N of the indoor fan 22 on the basis of the value AT of the temperature difference between the second-correction indoor temperature TR2, which has been obtained by correcting the indoor temperature TR in accordance with the floor temperature TF and the humidity TH, and the preset indoor temperature T5, and on the basis of the operating frequency 0 of the compressor 11 controlled by the outdoor control device 16. As described above, in the case where the operating frequency 0 of the compressor 11 does not change and is higher than 03 and the value AT of the temperature difference is smaller than or equal to Ti, the rotation speed N of the indoor fan 22 is remained at Mid. In the case where the operating frequency 0 of the compressor ii is higher than 02 and lower than or equal to 03 and the value AT of the temperature difference is smaller than or equal to Ti, the rotation speed N of the indoor fan 22 is switched from Mid to Low.
[0041] As described above, in Embodiment 3, the indoor temperature T is corrected according to the floor temperature TF to obtain the first-correction indoor temperature TR1, and the first-correction indoor temperature Ti is corrected according to the humidity TH detected by the humidity sensor 26 to obtain the second-correction indoor temperature R2* Then, the value AT of the temperature difference between the second-correction indoor temperature TR2 and the preset indoor temperature T3 is calculated, and the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency Q of the compressor 11. By taking the humidity TH as well as the floor temperature TE into account as data to be controlled when determining the rotation speed N of the indoor fan 22, a temperature control to achieve a temperature closer to the sensible temperature may be performed.
[0042] In Embodiments 1 2, and 3, the angle of the louver is read after the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor 11. However, this is merely an example, and the timing for reading the angle of the louver is not limited.
[0043] Furthermore, in Embodiments 1, 2, and 3, the rotation speed N of the indoor fan 22 is determined on the basis of the calculated value AT of the temperature difference and the operating frequency 0 of the compressor 11 (see Fig. 3). However, an ideal rotation speed of the indoor fan 22 may be obtained by multiplying a correction factor according to the determined rotation speed N. When the rotation speed N of the indoor fan 22 determined by referring to the database in Fig. 3 has gone beyond a cedain range, the rotation speed N of the indoor fan 22 may be controlled to become the ideal rotation speed. In such a case, the indoor temperature may be controlled to be more suitable for the current situation.
[Reference Signs List] [0044] 10: outdoor unit, 11: compressor, 12: four-way valve, 13: outdoor heat exchanger, 14: electronic expansion valve, 15: outdoor fan, 16: outdoor control device, 17: inverter, 18: refrigerant pipe, 20: indoor unit, 21: indoor heat exchanger, 22: indoor fan, 23: indoor control device, 24: room temperature sensor, 25: floor temperature sensor, 26: humidity sensor
GB1408552.6A 2013-07-31 2014-05-14 Air-conditioning apparatus Expired - Fee Related GB2517023B (en)

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