US20160320113A1 - Air conditioning apparatus - Google Patents

Air conditioning apparatus Download PDF

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Publication number
US20160320113A1
US20160320113A1 US14/769,186 US201414769186A US2016320113A1 US 20160320113 A1 US20160320113 A1 US 20160320113A1 US 201414769186 A US201414769186 A US 201414769186A US 2016320113 A1 US2016320113 A1 US 2016320113A1
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United States
Prior art keywords
thermo
indoor unit
indoor
temperature
case
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Abandoned
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US14/769,186
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English (en)
Inventor
Sachio Sekiya
Masanao Kotani
Shigeyuki Sasaki
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Hitachi Johnson Controls Air Conditioning Inc
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Hitachi Appliances Inc
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Assigned to HITACHI APPLIANCES, INC. reassignment HITACHI APPLIANCES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Kotani, Masanao, SASAKI, SHIGEYUKI, SEKIYA, SACHIO
Assigned to JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED reassignment JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI APPLIANCES, INC.
Publication of US20160320113A1 publication Critical patent/US20160320113A1/en
Assigned to JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED reassignment JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED CORRECTIVE ASSIGNMENT TO CORRECT THE RECEIVING PARTY STREET ADDRESS PREVIOUSLY RECORDED ON REEL 039240 FRAME 0438. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: HITACHI APPLIANCES, INC.
Assigned to HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. reassignment HITACHI-JOHNSON CONTROLS AIR CONDITIONING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOHNSON CONTROLS-HITACHI AIR CONDITIONING TECHNOLOGY (HONG KONG) LIMITED
Abandoned legal-status Critical Current

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    • 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
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F11/008—
    • 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
    • F24F11/30—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
    • F24F11/50—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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using 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
    • 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
    • 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
    • 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
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F24F2011/0013—
    • F24F2011/0068—
    • F24F2011/0073—
    • F24F2011/0075—
    • F24F2011/0082—
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • 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
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • 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
    • F25B2500/15—Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values
    • 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
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration 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
    • 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
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable 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
    • 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
    • F25B2700/21—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
    • F25B2700/2117—Temperatures of an evaporator
    • F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21172—Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
    • 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

Definitions

  • the present invention relates to an air conditioning apparatus.
  • an air conditioning apparatus that is configured by connecting an outdoor unit equipped with a compressor with a plurality of indoor units and performs an air conditioning operation such that a suction air temperature of each indoor unit reaches a set temperature that is to be set for each indoor unit.
  • an air conditioning apparatus one is known that controls the capacity of the compressor conforming to an air conditioning load, when the air conditioning capability becomes excessive due to mismatching with the air conditioning load and so forth, it enters a start-stop state that operation and stop of the indoor unit are repeated.
  • the corresponding indoor unit shifts from a thermo-on operation for performing the air conditioning operation to a thermo-off operation for stopping the air conditioning operation. Then, after the room temperature has been sufficiently increased by an indoor load, the indoor unit shifts again to the thermo-on operation and lowers the room temperature.
  • Patent Literature 1 in particular, in a case where a plurality of the indoor units have been installed in a large space and in a case where the air conditioning loads of the respective indoor units coincide with one another, timings that the plurality of indoor units enter the thermo-off operation are liable to synchronize with one another.
  • a control unit performs indoor thermo-timing changing control for changing a thermo-temperature width of anyone of the plurality of indoor units, thereby positively producing an indoor unit that is different from other indoor units in timing that it is made indoor thermo-off and/or indoor thermo-on. It is stated that it can become easy to obtain a situation that at least one of the plurality of indoor units is operating by such control.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2012-154600
  • the abovementioned prior art has such a problem as follows. That is, although in a case where the loads of the plurality of indoor units coincide with one other, the synchronized timings can be deviated from one another, for example, by lowering the thermo-off temperature of one indoor unit, in a case where they are not fully synchronized with one another and in a case there exists an indoor unit that is different in cycle such as in a case it is installed in a different room, there is the possibility that a sufficient effect cannot be obtained.
  • the present invention proposes to provide an air conditioning apparatus that suppresses an increase in power consumption associated with start-stop of the compressor and is high in energy saving property.
  • the indoor unit performs an air conditioning operation by switching between an thermo-on operation for performing a cooling operation or a heating operation and a thermo-off operation for suspending the cooling operation or the heating operation by using information on temperature difference between a suction air temperature and a set temperature, and shifts to a start-stop suppression operation mode for making any indoor unit perform the thermo-on operation in a case where an indoor unit A has met a thermo-off condition for switching from the thermo-on operation to the thermos-off operation and in a case where there is none of the indoor units is in the thermo-on operation other than the indoor unit A.
  • an air conditioning machine that can reduce the start-stop frequency of the compressor so as to suppress an increase in power consumption associated with start-stop of the compressor and is high in energy saving property by appropriately changing the thermo-on/thermo-off conditions of the indoor unit.
  • FIG. 1 is a diagram showing a configuration of an air conditioning apparatus of a first embodiment.
  • FIG. 2 is a diagram showing a relation among signals from a remote controller, a controller and each actuator.
  • FIG. 3 is a diagram showing an operational example in conventional control.
  • FIG. 4 is a diagram showing an operational example of the first embodiment.
  • FIG. 5 is a flowchart of the first embodiment.
  • FIG. 6 is a diagram showing an operational example at the time of heating operation.
  • FIG. 7 is a diagram showing an operational example that continuation of a start-stop suppression operation mode has been restricted depending on the temperature.
  • FIG. 8 is a diagram showing an operational example that continuation of the start-stop suppression operation mode has been restricted depending on the time.
  • FIG. 9 is a flowchart of a second embodiment.
  • FIG. 10 is a diagram showing an operational example of the second embodiment.
  • FIG. 11 is a diagram showing an operational example of a third embodiment.
  • FIG. 12 is a diagram showing an operational example of a fourth embodiment.
  • the indoor unit performs the air conditioning operation by switching between the thermo-on operation for performing the cooling operation or the heating operation and the thermo-off operation for suspending the cooling operation or the heating operation by using information on temperature difference between the suction air temperature and the set temperature, and shifts to the start-stop suppression operation mode for making any indoor unit perform the thermo-on operation in a case where the indoor unit A has met the thermo-off condition for switching from the thermo-on operation to the thermos-off operation and in a case where there is none of the indoor units is in the thermo-on operation other than the indoor unit A.
  • the start-stop suppression operation mode for making any one of the indoor units perform the thermo-on operation in a case where the indoor unit A has met the thermo-off condition for switching from the thermo-on operation to the thermo-off operation and in a case where there is none of the indoor units is in the thermo-on operation other than the indoor unit A, there can be made an air conditioning apparatus that can suppress an increase in power consumption associated with start-stop of the compressor by reducing the start-stop frequency of the compressor and is high in energy saving property.
  • FIG. 1 to FIG. 12 the air conditioning apparatus of the present invention will be described in detail by using FIG. 1 to FIG. 12 .
  • FIG. 1 to FIG. 8 A first embodiment of the present invention will be described by using FIG. 1 to FIG. 8 .
  • FIG. 1 is a cycle system diagram showing a configuration of an air conditioning apparatus in the present embodiment.
  • an example that two indoor units ( 91 a , 91 b ) have been connected to one outdoor unit 90 is shown.
  • the present invention is not limited to this and both of the outdoor unit 90 , the indoor unit 91 may be different in number of connected units.
  • the two indoor units ( 91 a , 91 b ) are connected in parallel with the outdoor unit 90 via a liquid pipe 13 and a gas pipe 12 .
  • the outdoor unit 90 possesses therein a compressor 1 that compresses a refrigerant (not shown), an outdoor heat exchanger 3 that performs heat exchange between outdoor air supplied by an outdoor fan 4 and the refrigerant, a four-way valve 5 for switchingly connecting one of a suction port and a discharge port of the compressor 1 to the outdoor heat exchanger 3 and the other to the gas pipe 12 .
  • the other end of the outdoor heat exchanger 3 to be connected with the four-way valve 5 is connected to the liquid pipe 13 via an outdoor expansion valve 8 .
  • one of an indoor heat exchanger 16 is connected to the gas pipe 12 and the other is connected to the liquid pipe 13 via an indoor expansion valve 18 .
  • Suction air from an indoor space is supplied to the indoor heat exchanger 16 by an indoor fan 17 .
  • a user performs operation start and stop of the indoor units, designation of operation modes for cooling and heating, inputting of a set temperature and so forth by a remote controller 92 .
  • the air conditioning capability of the air conditioning apparatus is determined on the basis of a temperature difference between the set temperature and a sensed temperature (a suction temperature) of a suction air temperature sensor 21 .
  • FIG. 1 An operation will be described with regard to a case where there is a request for a cooling operation from a remote controller 92 a .
  • a four-way valve 2 is switched to a circuit shown by a solid line in the drawing to operate the outdoor fan 4 and an indoor fan 17 a at predetermined rotation frequencies.
  • the refrigerant that has been compressed by the compressor 1 is condensed and liquefied by being heat-exchanged with the outdoor air by the outdoor heat exchanger 3 .
  • the liquefied refrigerant that has flown out into the liquid pipe 13 via the outdoor expansion valve 8 that is in a fully open state is pressure-reduced by an indoor expansion valve 18 a to be low in temperature and low in pressure and flows into the indoor heat exchanger 16 .
  • the refrigerant that has absorbed heat from the indoor air evaporates and turns to an overheated gaseous refrigerant and flows out into the gas pipe 12 .
  • the indoor air that has been cooled by this action is supplied to the indoor space and cools the indoor space.
  • the gasified refrigerant passes through the gas pipe 12 and returns to the compressor 1 via the four-way valve 2 in the outdoor unit 90 .
  • an indoor expansion valve 18 b is in a fully closed state and an indoor fan 17 b is in a stopped state.
  • the indoor expansion valve 18 b is appropriately adjusted in opening, the refrigerant in the liquid pipe 13 is pressure-reduced and flows into an indoor heat exchanger 16 b and is subjected to heat exchange with the indoor air that has been supplied by the indoor fan 17 b .
  • the evaporated gaseous refrigerant joins with the refrigerant that has evaporated in the indoor unit 92 a and returns to the outdoor unit 90 .
  • the four-way valve is switched to a circuit shown by a broken line in FIG. 1 to operate the outdoor fan 4 and the indoor fan 17 at the predetermined rotation frequencies.
  • the refrigerant that has been compressed by the compressor 1 flows into the indoor heat exchangers 16 a , 16 b through the gas pipe 12 .
  • the indoor heat exchanger 16 the refrigerant is condensed and liquefied and on the other hand the indoor space is heated by radiating heat to the indoor air supplied by the indoor fan 17 .
  • the condensed liquefied refrigerant After joined in the liquid pipe 13 , the condensed liquefied refrigerant turns to the low-temperature/low-pressure refrigerant by being pressure-reduced by the outdoor expansion valve 8 and evaporates by receiving heat from the outdoor air by the outdoor heat exchanger 3 . Thereafter, it returns to the compressor 1 via the four-way valve 2 and repeats again a compression process.
  • the rotation frequency of the compressor 1 is controlled such that a suction air temperature Tin 1 that a suction thermistor 21 of each indoor unit 91 has sensed becomes equal to a set temperature Ts set by the remote controller.
  • Ts set temperature
  • thermo-off operation that the indoor expansion valve 18 of the indoor unit 91 is closed to suspend the cooling operation is performed. Since in the thermo-off operation, the refrigerant is no longer supplied to the indoor heat exchanger 16 , a cooling action by evaporation of the refrigerant ceases. Accordingly, the room temperature is gradually increased by the load of the indoor space. Then, when the suction temperature is increased up to a predetermined temperature, the indoor expansion valve 18 is again opened to restart the thermo-on operation.
  • FIG. 3 is a diagram schematically showing the operation of such conventional control.
  • the horizontal axis indicates a time
  • the vertical axis indicates room temperatures (that is, the suction air temperature Tin) of the indoor units 91 a and 91 b , states of the thermo-on operation and the thermo-off operation and the operation state of the compressor.
  • the indoor unit 91 enters the thermo-on operation at a point of time that the suction air temperature Tin has reached a thermo-on lower limit value LL and thereafter enters the thermo-on operation at a point of time that the temperature has reached a thermo-off upper limit value HL.
  • HL 1 is +2° C.
  • LL is ⁇ 1° C. relative to the set temperature and a temperature width is 3° C.
  • the present embodiment is one example with respect to the widths of HL and LL relative to the set temperature and the condition when making it thermo-on or thermo-off, and conditions such as the time and others may be added not limited to the suction air temperature Tin.
  • both of the two indoor units 91 operate at the start time, since the suction air temperature Tin 1 of the indoor unit 91 a has reached a lower limit value LL 1 at a time t 1 , the indoor unit 91 a enters the thermo-off operation. Thereafter, the indoor unit 91 b continues the operation alone, and at a point of time that it has reached a lower limit value LL 2 at a time t 2 , also the indoor unit 91 b enters the thermo-off operation.
  • thermo-off operation means for temporarily changing a condition that the indoor unit was made thermo-off in a case where all of the indoor units met the condition for entering the thermo-off operation was provided.
  • An operational example in this case is shown in FIG. 4 and a flowchart of this control is shown in FIG. 5 .
  • the indoor unit 91 b continues the operation alone is the same as the conventional control. Thereafter, at a point of time that a suction air temperature Tin 2 (that is, the room temperature) that the suction thermistor 21 of the indoor unit 91 b has sensed has reached a thermo-on lower limit value LL 2 , the control of the present invention is performed. That is, when it is sensed that when the indoor unit 91 b is stopped, all of the indoor units ( 91 a , 91 b ) enter the thermo-off operation in the controller 60 , it shifts to the start-stop suppression operation mode without making the indoor unit 91 b perform the thermo-off operation.
  • a suction air temperature Tin 2 that is, the room temperature
  • thermo-on lower limit value LL 2 by a predetermined temperature (for example, 1° C.) and sends a command to the indoor unit 91 b so as to continue the thermo-on operation.
  • a predetermined temperature for example, 1° C.
  • the start-stop suppression operation mode is terminated to return the thermo-on lower limit value LL 2 to the normal value. Thereby, the indoor unit 91 b shifts to the thermo-off operation.
  • thermo-off lower limit value LL is returned to the original value after termination of the present control in this way, after termination of the present control, the operation within a normal temperature range is continued. Accordingly, reduction in temperature is limited to the temporal one and such an inconvenience that the room temperature stays low and so forth does not occur and the comfort can be maintained.
  • the suction air temperature Tin 2 of the indoor unit 91 b is temporarily lowered.
  • the thermo-off upper limit value HL 2 that the indoor unit 91 a that is in the thermo-off operation is made thermo-on is lowered by a predetermined width (for example, 1° C.). Accordingly, shifting to the thermo-on operation becomes possible even in a state that the temperature difference between it and the set temperature is small.
  • the suction air temperature Tin 1 of the indoor unit 91 a does not reach the temperature that it normally shifts to the thermo-on operation, it becomes possible to shift it to the thermo-on operation early. Since it became possible to shift the indoor unit 91 a that had been in the thermo-off operation so far to the thermo-on operation, the present control is terminated at this point of time, thereby returning from the start-stop suppression operation mode to a normal operation mode. That is, control of lowering the thermo-off upper limit value HL 1 and the thermo-on lower limit value LL 2 is released to return it to the normal state. Therefore, the indoor unit 91 b enters the thermo-off operation. Since a reduction width of the suction air temperature Tin 2 of the indoor unit 91 b can be suppressed by the present control in this way, the power consumption of the air conditioning apparatus can be reduced while reducing the influence on the comfort.
  • the start-stop suppression operation mode is terminated at the point of time that the indoor unit 91 a has been made thermo-off
  • operating times of the indoor units 91 a and 91 b may be overlapped for a predetermined time in order to suppress a fluctuation in refrigerating cycle at a timing of switching.
  • thermo-on operation time of the indoor unit 91 b may be other means. Specifically, it may be a technique for extending a time for deciding to be thermo-off after having reached the threshold temperature. In addition, it may be a technique for making it perform an air conditioning operation that is the same as that for thermo-off by forcedly adjusting the opening of the indoor expansion valve 18 from the outdoor unit and so forth, in a case where the indoor unit has been decided to be thermo-off.
  • thermo-off condition for the indoor unit 91 b when the thermo-off condition for the indoor unit 91 b has been met, it enters the start-stop suppression operation mode, it may be made such that, for example, in a case where the plurality of indoor units are connected, the possibility of continuation of the operation by the start-stop suppression operation mode is set in advance for every indoor unit. Accordingly, although in a case where continuation of the operation by the start-stop suppression operation mode has been set to be possible, it operates as in the present embodiment, for example, in a case where continuation of the thermo-on operation by the start-stop suppression operation mode has been set to be impossible for the indoor unit 91 b , it may be set so as to stop it similarly to FIG. 3 .
  • thermo-on upper limit temperature of the thermo-on indoor unit 91 b is set high by a predetermined temperature. Thereby, the indoor unit 91 b can continue the thermo-on operation.
  • thermo-off lower limit value of the thermo-off indoor unit 91 a is set high by a predetermined value, it is possible to make the indoor unit 91 a thermo-on early and as a result the indoor unit 91 b can be made thermo-off. Accordingly, an increase in suction air temperature Tin 2 in the indoor unit 91 b can be suppressed.
  • the air conditioning apparatus that, also in the heating operation, can suppress an increase in power consumption by avoiding start-stop of the compressor 1 while maintaining the comfort and is high in energy saving property in this way.
  • FIG. 7 shows an operational example in a case where air conditioning loads are different. Since all of the indoor units 91 meet the thermo-off condition at the time t 2 , it enters the start-stop suppression operation mode also in the present embodiment. Then, while the thermo-on lower limit temperature LL 2 of the thermo-on indoor unit 91 b is lowered, the thermo-off upper limit temperature HL 1 of the indoor unit 91 a is lowered.
  • the start-stop suppression operation mode is terminated at a point of time that the value of the suction air temperature Tin 2 of the indoor unit 91 b has reached the corrected thermo-on lower limit value LL 2 . Therefore, not only unnecessary continuation of the operation that is poor in efficiency can be avoided, but also reduction in comfort can be prevented.
  • FIG. 8 is an example that a limit has been set on a duration time of the start-stop suppression operation mode, not setting the lower limit value of the suction air temperature Tin 2 of the indoor unit 91 b for the similar problem.
  • a timer is counted from a point of time that it has shifted to the start-stop suppression operation mode at the time t 2 , in a case where the indoor unit 91 a cannot be made thermo-on at the time t 3 that it has elapsed for a time limit ⁇ T that has been defined in advance, it is decided that the load on the indoor unit 91 a is small and further continuation of the operation of the indoor unit 91 b is low in energy saving effect, the present control is released, the thermo-off upper limit value HL 1 of the indoor unit 91 a and the thermo-on lower limit value LL 2 of the indoor unit 91 b are returned to their original values and the indoor unit 91 b is made thermo-off to put the compressor 1 into the stop state.
  • the present control is effective particularly in a case where the thermo-off operation time is long.
  • FIG. 9 is a flowchart of the present control.
  • thermo-on standby state indicates a state that the suction air temperature Tin is higher (lower in the case of heating) than a previously defined predetermined temperature, the presence/absence of the indoor unit that is liable to be thermo-on is decided and start of the start-stop suppression operation mode is decided on the basis of it.
  • the indoor unit 91 a enters the thermo-off operation at the time t 1 and also the indoor unit 91 b meets the thermo-off condition at the time t 2 .
  • whether the start-stop suppression operation mode is to be started is decided by confirming the state of the thermo-off indoor unit 91 a.
  • the operational example that the lower limit values of the time limit and the room temperature are set so as to minimize an increase in power consumption and reduction in comfort caused by the start-stop suppression operation mode was shown.
  • whether the indoor unit 91 a will shift to the thermo-on operation in a predetermined time is estimated, in a case where it is decided that the indoor unit 91 a will enter the thermo-on operation early, the indoor unit 91 b is maintained in the thermo-on operation by shifting to the start-stop suppression operation mode.
  • the indoor unit 91 b is shifted to the thermo-off operation not shifting to the start-stop suppression operation mode.
  • thermo-off indoor unit 91 a in order to decide whether the thermo-off indoor unit 91 a will enter the thermo-on operation early, decision is made by using the suction air temperature Tin 1 of the indoor unit 91 a . That is, a decision temperature TC 1 that is higher than the thermo-on lower limit value LL 1 and not more than the thermo-off upper limit value HL 1 is defined and whether the thermo-off indoor unit will enter the thermo-on operation early is decided by using this decision temperature TC 1 .
  • thermo-on standby state that the possibility that it will be made thermo-on early is high, and the thermo-on operation of the indoor unit 91 b is continued only in a case where there exists the indoor unit that is in the thermo-on standby state.
  • the suction air temperature Tin 1 of the thermo-off indoor unit 91 a is lower than the decision temperature TC 1 at the time t 2 and there exists none of the indoor units is in the thermo-on standby state, the indoor unit 91 b is stopped at the time t 2 . Accordingly, at the time t 3 that the suction air temperature Tin 2 of the indoor unit 91 b has reached the thermo-off upper limit temperature HL 2 after the compressor 1 has been stopped similarly to the normal control, the compressor 1 is restarted.
  • start of the start-stop suppression operation mode is made when it is decided that the indoor units that perform the thermo-on operation will drop to zero.
  • start of the start-stop suppression operation mode can be decided by using information on other indoor units at that time.
  • the present invention is not limited to that and decision may be made by using, for example, a time that the suction air temperature of the indoor unit is changed, a thermo-off time in the past operation and so forth.
  • decision can be made by using the information on other indoor units at that time.
  • thermo-on lower limit values have been set in two stages. Since when the thermo-on lower limit value LL is lowered, the room temperature is temporarily lowered, in the present embodiment, in order to prevent this, a second thermo-on lower limit value mL was set to a temperature that is higher than the normal thermo-on lower limit value LL. Normally, it is made thermo-off at a point of time that the temperature has been lowered down to mL and the threshold value for thermo-off is lowered down to LL only when it has entered the start-stop suppression operation mode.
  • FIG. 11 An operational example will be described by using FIG. 11 . Since the suction temperature Tin 1 of the indoor unit 91 a has reached mL 1 at the time t 1 , the indoor unit 91 a is brought into the thermo-off state. Thereafter, since the suction temperature Tin 2 of the indoor unit 91 b keeps lowering and reaches mL 2 at the time t 2 , the indoor unit 91 b meets the thermo-off condition. However, at this time, when the indoor unit 91 b is made thermo-off, since the thermo-on indoor unit is lost and the compressor should be stopped, it shifts to the start-stop suppression operation mode.
  • thermo-on lower limit value of the indoor unit 91 b is changed from mL 2 to LL 2 to continue the cooling operation of the indoor unit 91 b .
  • the start-stop suppression operation mode is terminated and the indoor unit 91 b is shifted to the thermo-off state.
  • the suction temperature of the indoor unit 91 b is more lowered than mL 2 , it is not lowered down to LL 2 . Accordingly, an increase in power consumption associated with stop and start of the compressor can be suppressed by lowering a blow-out temperature of the indoor unit 91 b without giving the user an unpleasant feeling.
  • FIG. 12 is a diagram showing an operational example in a case where an indoor unit that is to be made thermo-on in the start-stop suppression operation mode has been fixed.
  • a case where three indoor units have been connected in parallel with one another is shown by way of example.
  • it is set in advance such that an indoor unit 91 c is made thermo-on in a case where all of the indoor units are to be made thermo-off.
  • the suction temperature Tint of the indoor unit 91 a and the suction temperature Tin 2 of the indoor unit 91 b have respectively reached the thermo-on lower limit value LL at the time t 1 and the time t 2 , they meet the thermo-off condition. Since the indoor unit 91 c is in the thermo-off state, when the indoor unit 91 b is made thermo-off at the time t 2 , all of the indoor units enter the thermo-off states and the compressor 1 is stopped. Thus, in the present embodiment, the indoor unit 91 c is shifted to the thermo-on state by working the start-stop suppression operation mode so as to avoid stop of the compressor 1 .
  • the indoor unit 91 c is returned to the thermo-off state.
  • the indoor unit 91 c may be left in the thermo-on state, the operating time in a state that the suction temperature of the indoor unit 91 c is in a low state is increased in this case and therefore it is desirable to bring it to the thermo-off state.
  • the start-stop suppression operation mode frequently occurs, since there is the possibility that the state that the suction temperature of the indoor unit 91 c is low may last, it becomes easy to avoid such a condition by returning it to the thermo-off state.

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US14/769,186 2014-07-28 2014-07-28 Air conditioning apparatus Abandoned US20160320113A1 (en)

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US10539357B2 (en) * 2015-12-08 2020-01-21 Lg Electronics Inc. Refrigerator and method of controlling the same
US11536474B2 (en) * 2017-06-01 2022-12-27 Mitsubishi Electric Corporation Air-conditioning system controlling evaporating temperatures of indoor units and ventilator

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JP6531794B2 (ja) * 2017-07-31 2019-06-19 ダイキン工業株式会社 空気調和装置
JP7417368B2 (ja) * 2019-05-27 2024-01-18 シャープ株式会社 空気調和機
CN112665204B (zh) * 2020-12-25 2022-09-02 青岛海尔空调器有限总公司 用于双蒸发器空调的控制方法及装置、双蒸发器空调
JP6994599B1 (ja) 2021-08-27 2022-01-14 日立ジョンソンコントロールズ空調株式会社 空気調和機

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WO2016016918A1 (ja) 2016-02-04

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