WO2015046350A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
- Publication number
- WO2015046350A1 WO2015046350A1 PCT/JP2014/075466 JP2014075466W WO2015046350A1 WO 2015046350 A1 WO2015046350 A1 WO 2015046350A1 JP 2014075466 W JP2014075466 W JP 2014075466W WO 2015046350 A1 WO2015046350 A1 WO 2015046350A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- heat exchanger
- compressor
- outdoor
- main valve
- Prior art date
Links
- 239000003507 refrigerant Substances 0.000 claims abstract description 185
- 238000010257 thawing Methods 0.000 claims abstract description 127
- 238000005057 refrigeration Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims description 84
- 238000013021 overheating Methods 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 34
- 238000012986 modification Methods 0.000 description 21
- 230000004048 modification Effects 0.000 description 21
- 238000001816 cooling Methods 0.000 description 20
- 238000004891 communication Methods 0.000 description 18
- 230000006870 function Effects 0.000 description 8
- 238000004378 air conditioning Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
Images
Classifications
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
- 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
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
-
- 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
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/031—Sensor arrangements
- F25B2313/0315—Temperature sensors near the outdoor 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
-
- 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
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2501—Bypass valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2104—Temperatures of an indoor room or compartment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
-
- 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 is an air conditioner, in particular, a discharge used in a positive cycle defrosting operation for defrosting an outdoor heat exchanger while circulating a refrigerant in the order of a compressor, an indoor heat exchanger, a main valve, and an outdoor heat exchanger. -Relates to an air conditioner having a suction bypass circuit.
- Patent Document 1 Japanese Patent Laid-Open No. 61-262560.
- This air conditioner is capable of heating operation in which refrigerant is circulated in the order of the compressor, the indoor heat exchanger, the main valve, and the outdoor heat exchanger, and also from the discharge side of the compressor to the suction side of the compressor during the heating operation.
- a discharge-suction bypass circuit that allows the refrigerant to be bypassed.
- the discharge-suction bypass circuit is operated during the positive cycle defrosting operation in which the outdoor heat exchanger is defrosted while circulating the refrigerant in the order of the compressor, the indoor heat exchanger, the main valve, and the outdoor heat exchanger.
- the refrigerant is bypassed from the discharge side of the compressor to the suction side of the compressor through the discharge-suction bypass circuit.
- the main valve is in the fully open state during the normal cycle defrosting operation. For this reason, it becomes difficult for the high pressure of the refrigeration cycle to rise sufficiently, and the power input to the compressor decreases, resulting in a decrease in the amount of heat that can be used for defrosting, an increase in the liquid back to the compressor, It becomes easy to fall into a vicious cycle of lowering the high pressure of the refrigeration cycle and reducing the input power to the compressor. Such a vicious cycle may prevent the normal cycle defrosting operation from being continued.
- An object of the present invention is to provide a discharge-suction bypass circuit used in a positive cycle defrosting operation for defrosting an outdoor heat exchanger while circulating a refrigerant in the order of a compressor, an indoor heat exchanger, a main valve, and an outdoor heat exchanger.
- the air conditioner having the above the high pressure of the refrigeration cycle is maintained high, the input power to the compressor is increased, and the amount of defrost heat can be ensured.
- the air conditioner according to the first aspect has a main refrigerant circuit and a discharge-suction bypass circuit.
- the main refrigerant circuit has a compressor, an indoor heat exchanger, a main valve, and an outdoor heat exchanger, and the heating operation for circulating the refrigerant in the order of the compressor, the indoor heat exchanger, the main valve, and the outdoor heat exchanger. Can be done.
- the discharge-suction bypass circuit has an overheat valve, and is connected to the main refrigerant circuit so that the refrigerant can be bypassed from the discharge side of the compressor to the suction side of the compressor during heating operation.
- the overheat valve is opened and the discharge-suction is performed.
- the main valve high pressure during defrosting bypasses the refrigerant from the discharge side of the compressor to the suction side of the compressor through the bypass circuit, and adjusts the opening of the main valve so that the high pressure of the refrigeration cycle in the main refrigerant circuit becomes the target high pressure Take control.
- the opening degree of the main valve is adjusted (main valve high pressure control during defrosting) so that the high pressure of the refrigeration cycle becomes the target high pressure. For this reason, the high pressure of the refrigeration cycle can be maintained near the desired target high pressure during the positive cycle defrosting operation. Thereby, here, the input power of the compressor is increased, and as a result, the amount of heat that can be used for defrosting can be secured, and the normal cycle defrosting operation can be continued.
- the air conditioner according to the second aspect is the air conditioner according to the first aspect, wherein the target high pressure is set to a value near the upper limit value of the high pressure during the heating operation.
- the target high pressure is set to a value near the upper limit of the high pressure during the heating operation, the high pressure of the refrigeration cycle during the normal cycle defrosting operation can be maintained sufficiently high. Thereby, the calorie
- the air conditioner according to the third aspect is the air conditioner according to the first or second aspect, wherein the high pressure is obtained from the temperature of the refrigerant detected by the indoor heat exchanger temperature sensor provided in the indoor heat exchanger.
- An air conditioner according to a fourth aspect is the air conditioner according to any of the first to third aspects, wherein the opening of the main valve is controlled based on the temperature of the refrigerant on the discharge side of the compressor during the heating operation. Controls the main valve discharge temperature during heating.
- the opening degree of the main valve is controlled based on the refrigerant temperature on the discharge side of the compressor during heating operation (heating main valve discharge temperature control), and during the forward cycle defrosting operation, the refrigeration cycle
- the high pressure is controlled so as to be the target high pressure (main valve high pressure control during defrosting).
- An air conditioner according to a fifth aspect is the air conditioner according to any of the first to fourth aspects, wherein the superheat degree of the refrigerant on the discharge side of the compressor is a target discharge superheat degree during the normal cycle defrosting operation.
- the defrosting discharge temperature control is performed to adjust the opening degree of the superheat valve so that
- the opening degree of the superheater valve is adjusted so that the superheat degree of the refrigerant on the discharge side of the compressor becomes the target discharge superheat degree (discharge temperature control during defrosting). I am doing so. For this reason, during the positive cycle defrosting operation, both excessive liquid back to the compressor and excessive cooling of the refrigerant sucked into the compressor cause the compressor to be burned or damaged. Can be suppressed. Thereby, the reliability of a compressor can be ensured here at the time of forward cycle defrost operation.
- An air conditioner according to a sixth aspect is the air conditioner according to any one of the first to fifth aspects, further comprising an outdoor fan that supplies air to the outdoor heat exchanger, and the forward cycle defrosting During operation, if the temperature of the refrigerant detected by the outdoor heat exchanger temperature sensor provided in the outdoor heat exchanger has not risen to the fan start / stop temperature, which is a value near the outside air temperature, the outdoor fan is operated, When the temperature rises to the start / stop temperature, the outdoor fan control is performed during defrosting to stop the outdoor fan.
- the outdoor fan is not always stopped during the positive cycle defrosting operation, but until the temperature of the refrigerant in the outdoor heat exchanger rises to around the outside air temperature (here, the fan start / stop temperature). Operates an outdoor fan, and then performs control to stop the outdoor fan (outdoor fan control during defrosting). For this reason, when the outdoor fan is in operation, the outdoor heat exchanger can be defrosted using the amount of heat generated by the input power to the compressor and the amount of heat generated by heat exchange with the air. Thereby, the defrosting time of the normal cycle defrosting operation can be shortened.
- FIG. 6 is a schematic configuration diagram of an air conditioner according to Modifications 1 to 4 of the present invention (the refrigerant flow during the normal cycle defrosting operation is also shown). It is a time chart which shows operation
- FIG. 1 is a schematic configuration diagram of an air conditioner 1 according to an embodiment of the present invention.
- the air conditioner 1 is a device that can cool and heat a room such as a building by performing a vapor compression refrigeration cycle.
- the air conditioner 1 is mainly configured by connecting an outdoor unit 2 and an indoor unit 4.
- the outdoor unit 2 and the indoor unit 4 are connected via a liquid refrigerant communication tube 5 and a gas refrigerant communication tube 6.
- the vapor compression refrigerant circuit 10 of the air conditioner 1 is configured by connecting the outdoor unit 2 and the indoor unit 4 via the refrigerant communication pipes 5 and 6.
- the indoor unit 4 is installed indoors and constitutes a part of the refrigerant circuit 10.
- the indoor unit 4 mainly has an indoor heat exchanger 41.
- the indoor heat exchanger 41 is a heat exchanger that functions as a refrigerant evaporator during cooling operation to cool room air, and functions as a refrigerant radiator during heating operation to heat indoor air.
- the liquid side of the indoor heat exchanger 41 is connected to the liquid refrigerant communication tube 5, and the gas side of the indoor heat exchanger 41 is connected to the gas refrigerant communication tube 6.
- the indoor unit 4 has an indoor fan 42 for sucking indoor air into the indoor unit 4 and exchanging heat with the refrigerant in the indoor heat exchanger 41 and supplying the indoor air as supply air. That is, the indoor unit 4 has an indoor fan 42 as a fan that supplies indoor air as a heating source or cooling source of the refrigerant flowing through the indoor heat exchanger 41 to the indoor heat exchanger 41.
- the indoor fan 42 a centrifugal fan, a multiblade fan or the like driven by an indoor fan motor 42a capable of rotating speed control is used.
- the indoor unit 4 is provided with various sensors. Specifically, the indoor heat exchanger 41 is provided with an indoor heat exchange temperature sensor 55 that detects the temperature Txi of the refrigerant in the indoor heat exchanger 41. The indoor unit 4 is provided with an indoor temperature sensor 56 that detects the temperature Tra of the indoor air sucked into the indoor unit 4.
- the indoor unit 4 has an indoor side control unit 43 that controls the operation of each unit constituting the indoor unit 4.
- the indoor side control part 43 has the microcomputer, memory, etc. which were provided in order to control the indoor unit 4, and is with the remote control (not shown) for operating the indoor unit 4 separately. Control signals and the like can be exchanged between them, and control signals and the like can be exchanged with the outdoor unit 2 via the transmission line 7.
- the outdoor unit 2 is installed outside and constitutes a part of the refrigerant circuit 10.
- the outdoor unit 2 mainly includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, a main valve 24, and a discharge-suction bypass circuit 26.
- the compressor 21 is a device that compresses the low-pressure refrigerant in the refrigeration cycle until it reaches a high pressure.
- the compressor 21 has a sealed structure in which a rotary type or scroll type positive displacement compression element (not shown) is rotationally driven by a compressor motor 21a capable of frequency control by an inverter.
- the compressor 21 has a suction pipe 31 connected to the suction side via an attached accumulator 21b, and a discharge pipe 32 connected to the discharge side.
- the suction pipe 31 is a refrigerant pipe that connects the suction side of the compressor 21 and the four-way switching valve 22.
- the discharge pipe 32 is a refrigerant pipe that connects the discharge side of the compressor 21 and the four-way switching valve 22.
- the four-way switching valve 22 is a switching valve for switching the direction of refrigerant flow in the refrigerant circuit 10.
- the four-way switching valve 22 causes the outdoor heat exchanger 23 to function as a radiator for the refrigerant compressed in the compressor 21 and the indoor heat exchanger 41 for the refrigerant that has radiated heat in the outdoor heat exchanger 23.
- the suction side (here, the suction pipe 31) of the compressor 21 and the gas refrigerant communication pipe 6 side (here, the second gas refrigerant pipe 34) are connected (solid line of the four-way switching valve 22 in FIG. 1). See).
- the four-way switching valve 22 causes the outdoor heat exchanger 23 to function as an evaporator of the refrigerant that has radiated heat in the indoor heat exchanger 41 during the heating operation, and the indoor heat exchanger 41 is compressed in the compressor 21. Switching to a heating cycle state that functions as a refrigerant radiator.
- the four-way switching valve 22 is connected to the discharge side (here, the discharge pipe 32) of the compressor 21 and the gas refrigerant communication pipe 6 side (here, the second gas refrigerant pipe 34). (Refer to the broken line of the four-way switching valve 22 in FIG. 1).
- the suction side of the compressor 21 here, the suction pipe 31
- the gas side of the outdoor heat exchanger 23 here, the first gas refrigerant pipe 33
- the first gas refrigerant pipe 33 is a refrigerant pipe connecting the four-way switching valve 22 and the gas side of the outdoor heat exchanger 23.
- the second gas refrigerant pipe 33 is a refrigerant pipe that connects the four-way switching valve 22 and the gas refrigerant communication pipe 6 side.
- the outdoor heat exchanger 23 is a heat exchanger that functions as a refrigerant radiator that uses outdoor air as a cooling source during cooling operation, and that functions as a refrigerant evaporator that uses outdoor air as a heating source during heating operation.
- the outdoor heat exchanger 23 has a liquid side connected to the liquid refrigerant pipe 35 and a gas side connected to the first gas refrigerant pipe 33.
- the liquid refrigerant pipe 35 is a refrigerant pipe that connects the liquid side of the outdoor heat exchanger 23 and the liquid refrigerant communication pipe 5 side.
- the main valve 24 is a valve that depressurizes the high-pressure refrigerant of the refrigeration cycle radiated in the outdoor heat exchanger 23 to the low pressure of the refrigeration cycle during the cooling operation. Further, the main valve 24 is a valve that reduces the high-pressure refrigerant of the refrigeration cycle radiated in the indoor heat exchanger 41 to the low pressure of the refrigeration cycle during the heating operation.
- the main valve 24 is provided in the liquid refrigerant pipe 35.
- an electric expansion valve capable of opening degree control is used as the main valve 24.
- the discharge-suction bypass circuit 26 is a refrigerant pipe that allows the refrigerant to be bypassed from the discharge side of the compressor 21 to the suction side of the compressor 21 during heating operation.
- the discharge-suction bypass circuit 26 is provided so as to branch from the discharge pipe 32 and join the suction pipe 31.
- the discharge-suction bypass circuit 26 has an overheat valve 27.
- an electromagnetic valve capable of opening / closing control is used as the overheating valve 27.
- the outdoor unit 2 has an outdoor fan 25 for sucking outdoor air into the outdoor unit 2 and exchanging heat with the refrigerant in the outdoor heat exchanger 23 and then discharging the air to the outside. That is, the outdoor unit 2 has an outdoor fan 25 as a fan that supplies outdoor air as a cooling source or a heating source of the refrigerant flowing through the outdoor heat exchanger 23 to the outdoor heat exchanger 23.
- the outdoor fan 25 a propeller fan or the like driven by an outdoor fan motor 25a capable of rotating speed control is used.
- the outdoor unit 2 is provided with various sensors. Specifically, the outdoor heat exchanger 23 is provided with an outdoor heat exchanger temperature sensor 53 that detects the temperature Txo of the refrigerant in the outdoor heat exchanger 23.
- the outdoor unit 2 is provided with an outdoor air temperature sensor 54 that detects a temperature Toa of outdoor air sucked into the outdoor unit 2.
- the discharge pipe 32 or the compressor 21 is provided with a discharge temperature sensor 52 that detects the temperature Td of the high-pressure refrigerant in the refrigeration cycle discharged from the compressor 21.
- the outdoor unit 2 includes an outdoor control unit 28 that controls the operation of each unit constituting the outdoor unit 2.
- the outdoor control unit 28 includes a microcomputer and a memory provided for controlling the outdoor unit 2, and exchanges control signals and the like with the indoor unit 4 via the transmission line 7. Can be done.
- Refrigerant communication pipes 5 and 6 are refrigerant pipes constructed on site when the air conditioner 1 is installed at an installation location such as a building, and installation conditions such as the installation location and a combination of an outdoor unit and an indoor unit. Those having various lengths and tube diameters are used.
- the refrigerant circuit 10 of the air conditioner 1 is configured by connecting the outdoor unit 2, the indoor unit 4, and the refrigerant communication pipes 5 and 6.
- the refrigerant circuit 10 mainly includes a main refrigerant circuit 11 having a compressor 21, an indoor heat exchanger 41, a main valve 24, and an outdoor heat exchanger 23 (part of the refrigerant circuit 10 excluding the discharge-suction bypass circuit 26). ) Is connected to a discharge-suction bypass circuit 26 having an overheat valve 27.
- the main refrigerant circuit 11 of the refrigerant circuit 10 switches the four-way switching valve 22 to the heating cycle state as will be described later, so that the compressor 21, the indoor heat exchanger 41, the main valve 24, and the outdoor heat exchanger 23 are switched. It is possible to perform a heating operation in which the refrigerant is circulated in this order.
- the air conditioner 1 can control each device of the outdoor unit 2 and the indoor unit 4 by the control unit 8 including the indoor side control unit 43 and the outdoor side control unit 28. That is, the control part 8 which performs operation control of the whole air conditioning apparatus 1 including heating operation etc. is comprised by the transmission line 7 which connects between the indoor side control part 43 and the outdoor side control part 28.
- control unit 8 is connected so that it can receive detection signals from the various sensors 52 to 56, and various devices and valves 21a, 22, 24 based on these detection signals. 25a, 27, 42a, etc. are connected so as to be controlled.
- the air conditioner 1 can perform a cooling operation (see FIG. 3) and a heating operation (see FIG. 4). In addition, during the heating operation, it is also possible to perform a normal cycle defrosting operation (see FIGS. 5 and 6) for melting frost attached to the outdoor heat exchanger 23.
- the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 21 and is compressed until it reaches a high pressure in the refrigeration cycle, and then discharged.
- the high-pressure gas refrigerant discharged from the compressor 21 is sent to the outdoor heat exchanger 23 through the four-way switching valve 22.
- the high-pressure gas refrigerant sent to the outdoor heat exchanger 23 performs heat exchange with the outdoor air supplied as a cooling source by the outdoor fan 36 in the outdoor heat exchanger 23 to dissipate heat to become a high-pressure liquid refrigerant. .
- the high-pressure liquid refrigerant that has radiated heat in the outdoor heat exchanger 23 is sent to the main valve 24.
- the high-pressure liquid refrigerant sent to the main valve 24 is decompressed by the main valve 24 to the low pressure of the refrigeration cycle, and becomes a low-pressure gas-liquid two-phase refrigerant.
- the low-pressure gas-liquid two-phase refrigerant decompressed by the main valve 24 is sent to the indoor heat exchanger 41 through the liquid refrigerant communication pipe 5.
- the low-pressure gas-liquid two-phase refrigerant sent to the indoor heat exchanger 41 evaporates in the indoor heat exchanger 41 by exchanging heat with indoor air supplied as a heating source by the indoor fan 42. As a result, the room air is cooled and then supplied to the room to cool the room.
- the low-pressure gas refrigerant evaporated in the indoor heat exchanger 41 is again sucked into the compressor 21 through the gas refrigerant communication pipe 6 and the four-way switching valve 22.
- the cooling operation is performed in which the refrigerant is circulated in the order of the compressor 21, the outdoor heat exchanger 23, the main valve 24, and the indoor heat exchanger 41.
- the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 21 and is compressed until it reaches a high pressure in the refrigeration cycle, and then discharged.
- the high-pressure gas refrigerant discharged from the compressor 21 is sent to the indoor heat exchanger 41 through the four-way switching valve 22 and the gas refrigerant communication pipe 6.
- the high-pressure gas refrigerant sent to the indoor heat exchanger 41 radiates heat by exchanging heat with indoor air supplied as a cooling source by the indoor fan 42 in the indoor heat exchanger 41 to become a high-pressure liquid refrigerant. . Thereby, indoor air is heated, and indoor heating is performed by being supplied indoors after that.
- the high-pressure liquid refrigerant radiated by the indoor heat exchanger 41 is sent to the main valve 24 through the liquid refrigerant communication pipe 5.
- the high-pressure liquid refrigerant sent to the main valve 24 is decompressed by the main valve 24 to the low pressure of the refrigeration cycle, and becomes a low-pressure gas-liquid two-phase refrigerant.
- the low-pressure gas-liquid two-phase refrigerant decompressed by the main valve 24 is sent to the outdoor heat exchanger 23.
- the low-pressure gas-liquid two-phase refrigerant sent to the outdoor heat exchanger 23 evaporates by exchanging heat with outdoor air supplied as a heating source by the outdoor fan 25 in the outdoor heat exchanger 23. Become a gas refrigerant.
- the low-pressure refrigerant evaporated in the outdoor heat exchanger 23 is again sucked into the compressor 21 through the four-way switching valve 22.
- the heating operation is performed in which the refrigerant is circulated in the order of the compressor 21, the indoor heat exchanger 41, the main valve 24, and the outdoor heat exchanger 23.
- the normal cycle defrosting operation is the same as in the heating operation, that is, in the heating cycle state in which the four-way switching valve 22 is indicated by the broken line in FIG. 21 is an operation for defrosting the outdoor heat exchanger 23 while circulating the refrigerant in the order of the indoor heat exchanger 41, the main valve 24, and the outdoor heat exchanger 23.
- the suction valve 21 sucks the compressor 21 from the discharge side of the compressor 21 through the discharge-suction bypass circuit 26 by opening the overheat valve 27 of the discharge-suction bypass circuit 26. The operation of bypassing the refrigerant to the side is performed.
- the low-pressure gas refrigerant in the refrigeration cycle is sucked into the compressor 21 and compressed after being compressed to a high pressure in the refrigeration cycle, and then discharged.
- a part of the high-pressure gas refrigerant discharged from the compressor 21 is bypassed to the suction side of the compressor 21 through the discharge-suction bypass circuit 26, and the remaining gas refrigerant is the four-way switching valve 22 and the gas refrigerant communication pipe 6. And sent to the indoor heat exchanger 41.
- the high-pressure gas refrigerant sent to the indoor heat exchanger 41 radiates heat by exchanging heat with indoor air supplied as a cooling source by the indoor fan 42 in the indoor heat exchanger 41.
- the room air is heated and then supplied indoors, so that the room is continuously heated even during defrosting.
- the high-pressure refrigerant radiated by the indoor heat exchanger 41 is sent to the outdoor heat exchanger 23 through the liquid refrigerant communication tube 5 and the main valve 24.
- the refrigerant sent to the outdoor heat exchanger 23 exchanges heat with frost attached to the outdoor heat exchanger 23 to dissipate heat, and enters a gas-liquid two-phase state with a large amount of liquid refrigerant. Thereby, the frost adhering to the outdoor heat exchanger 23 is melted, and the outdoor heat exchanger 23 is defrosted.
- the gas-liquid two-phase refrigerant of the liquid refrigerant radiated by the outdoor heat exchanger 23 is sent to the suction pipe 31 through the four-way switching valve 22 and is bypassed to the suction side of the compressor 21 through the discharge-suction bypass circuit 26.
- the gas refrigerant is combined with the gas refrigerant to be in a gas-liquid two-phase state or a gas state with a small amount of liquid refrigerant, and is sucked into the compressor 21 again.
- the refrigerant in the refrigerant circuit 10, the refrigerant is circulated in the order of the compressor 21, the indoor heat exchanger 41, the main valve 24, and the outdoor heat exchanger 23, and the overheat valve 27 is opened and compressed through the discharge-suction bypass circuit 26.
- a positive cycle defrosting operation is performed to bypass the refrigerant from the discharge side of the machine 21 to the suction side of the compressor 21.
- the main valve high pressure control during defrosting is performed in which the opening degree of the main valve 24 is adjusted so that the high pressure Ph of the refrigeration cycle in the main refrigerant circuit 11 becomes the target high pressure Phs.
- control of various devices including the forward cycle defrosting operation and the heating operation before and after the forward cycle defrosting operation will be described with reference to a time chart during the forward cycle defrosting operation and the heating operation before and after that.
- the overheat valve 27 is fully closed as described above, and the main valve 24, the compressor 21, the outdoor fan 25, and the indoor fan. 42 is controlled so that the temperature Tra of the indoor air detected by the indoor temperature sensor 56 becomes the target indoor temperature, for example.
- the heating main valve discharge temperature control for adjusting the opening of the main valve 24 based on the refrigerant temperature Td on the discharge side of the compressor 21 is performed. Specifically, control is performed to adjust the opening of the main valve 24 so that the refrigerant temperature Td on the discharge side of the compressor 21 becomes the target discharge temperature Tds.
- control is performed to reduce the opening of the main valve 24.
- the main valve 24 is controlled. Control to increase the opening degree of is performed.
- the normal cycle defrosting operation is started.
- the refrigerant is bypassed from the discharge side of the compressor 21 to the suction side of the compressor 21 through the discharge-suction bypass circuit 26 by fully opening the overheating valve 27 as described above. Is done.
- the above-described main valve high pressure control during defrosting is performed instead of the heating main valve discharge temperature control.
- the refrigerant temperature Txi detected by the indoor heat exchange temperature sensor 55 corresponds to the refrigerant saturation temperature at the high pressure Ph of the refrigeration cycle
- the refrigerant temperature Txi is used as the high pressure Ph of the refrigeration cycle
- Control is performed to adjust the opening of the main valve 24 so that the high pressure Ph becomes the target high pressure Phs. That is, when the high pressure Ph is lower than the target high pressure Phs, control is performed to reduce the opening of the main valve 24, and when the high pressure Ph is higher than the target high pressure Phs, the opening of the main valve 24 is increased.
- the target high pressure Ph is set to a value near the upper limit value Phx of the high pressure Ph during the heating operation.
- the upper limit value Phx of the high pressure Ph is a value that is defined in consideration of the design pressure of the equipment constituting the refrigerant circuit 10, and a pressure value slightly lower than this value is set as the target high pressure Ph.
- the compressor 21 is operated at a defrost frequency that is a frequency for the positive cycle defrost operation.
- the defrost frequency is set to a high frequency near the highest frequency.
- the outdoor fan 25 is stopped.
- the indoor fan 42 is operated at a defrosting rotational speed that is a rotational speed for a normal cycle defrosting operation.
- the defrosting rotation speed is set to the minimum rotation speed or a low rotation speed near the minimum rotation speed.
- the normal cycle defrosting operation is terminated and the heating operation is resumed. Specifically, the overheat valve 26 is fully closed, the control of the main valve 24 is returned from the main valve high pressure control during defrosting to the main valve discharge temperature control during heating, and the compressor 21, the outdoor fan 25 and the indoor fan 42 are controlled. Is returned to the control details during heating operation.
- the opening degree of the main valve 24 is set so that the high pressure Ph of the refrigeration cycle in the main refrigerant circuit 11 becomes the target high pressure Phs during the normal cycle defrosting operation.
- the main valve high pressure control is performed during defrosting.
- the forward cycle defrosting operation has the following characteristics.
- the opening degree of the main valve 24 is adjusted (main valve high pressure control during defrosting) so that the high pressure Ph of the refrigeration cycle becomes the target high pressure Phs. .
- the high pressure Ph of the refrigeration cycle can be maintained near the desired target high pressure Phs.
- the target high pressure Ph is set to a value near the upper limit value Phx of the high pressure Ph during the heating operation, the high pressure Ph of the refrigeration cycle during the normal cycle defrosting operation is sufficiently high. Can be maintained. Thereby, the calorie
- the high pressure Ph of the refrigeration cycle is obtained by the indoor heat exchanger temperature sensor 55 as described above, it is possible to dispense with providing a pressure sensor for obtaining the high pressure Ph of the refrigeration cycle.
- the opening degree of the main valve 24 is controlled based on the refrigerant temperature Td on the discharge side of the compressor 21 during heating operation (main valve discharge temperature control during heating), and the positive cycle is removed.
- control is performed so that the high pressure Ph of the refrigeration cycle becomes the target high pressure Phs (main valve high pressure control during defrosting). Thereby, here, it can switch to the optimal opening degree control of the main valve 24 according to the content of operation.
- the use of a valve capable of opening degree control as the overheat valve 27 makes it possible to discharge the compressor 21 together with the defrosting main valve high pressure control by the main valve 24 during the normal cycle defrosting operation.
- the defrosting discharge temperature control may be performed to adjust the opening degree of the superheat valve 27 so that the superheat degree TdSH of the refrigerant on the side becomes the target discharge superheat degree TdSHs.
- the temperature of the refrigerant on the discharge side of the compressor 21 is obtained from the temperature Td of the refrigerant detected by the discharge temperature sensor 52 provided on the discharge side of the compressor 21, and the refrigerant on the discharge side of the compressor 21 is obtained.
- the superheat degree TdSH of the refrigerant on the discharge side of the compressor 21 is obtained from the temperatures of the two refrigerants. Obtained from Td, Txi.
- the superheat degree TdSH is obtained by subtracting the refrigerant temperature Txi from the refrigerant temperature Td. And the control which adjusts the opening degree of the superheater valve 27 is performed so that this superheat degree TdSH becomes the target discharge superheat degree TdSHs.
- the superheat degree TdSH when the superheat degree TdSH is lower than the target discharge superheat degree TdSHs, control is performed to increase the opening degree of the superheat valve 27, and when the superheat degree TdSH is higher than the target discharge superheat degree TdSHs, the superheat valve 27 is controlled. Control to reduce the opening of.
- the target discharge superheat degree TdSHs is 5 deg. ⁇ 15 deg. Set to a value of degree. Control of other devices (main valve 24, compressor 21, outdoor fan 25, and indoor fan 42) during the positive cycle defrosting operation is the same as in the above embodiment.
- the opening degree of the superheat valve 27 is set so that the superheat degree TdSH of the refrigerant on the discharge side of the compressor 21 becomes the target discharge superheat degree TdSHs. Adjustment (discharge temperature control during defrosting) is performed. For this reason, during the positive cycle defrosting operation, excessive liquid back to the compressor 21 and excessive cooling of the refrigerant sucked into the compressor 21 causes the compressor 21 to be burned or damaged. Both can be suppressed. Thereby, the reliability of the compressor 21 can be ensured here at the time of the forward cycle defrosting operation.
- the fan start / stop in which the refrigerant temperature Txo detected by the outdoor heat exchanger temperature sensor 53 provided in the outdoor heat exchanger 23 is a value near the outside air temperature.
- the outdoor fan 25 may be operated when the outdoor fan 25 is operated when the temperature does not rise to the temperature Tfs, and when the outdoor fan 25 is stopped when the temperature rises to the fan start / stop temperature Tfs.
- the fan start / stop temperature Tfs is the outdoor air temperature Toa ⁇ 2 deg. Set to a value of degree.
- control of the other apparatus at the time of a normal cycle defrost operation is the same as that of said embodiment or the modification 1.
- the content which applied the outdoor fan control at the time of a defrost to the normal cycle defrost operation (refer FIG. 8) in the modification 1 is illustrated, the normal cycle defrost operation in said embodiment ( Defrosting outdoor fan control may be applied to (see FIG. 6).
- the outdoor fan 25 is not always stopped during the positive cycle defrosting operation, but the refrigerant temperature Txo in the outdoor heat exchanger 23 is near the outdoor air temperature Toa (here, The outdoor fan 25 is operated until the fan start / stop temperature Tfs) is increased, and thereafter, the outdoor fan 25 is stopped (defrosting outdoor fan control). For this reason, when the outdoor fan 25 is operated, the outdoor heat exchanger 23 can be defrosted using the heat amount by the input power to the compressor 21 and the heat amount by heat exchange with the air. . Thereby, the defrosting time of the normal cycle defrosting operation can be shortened.
- the opening degree of the main valve 24 and the superheat valve 27 is gradually changed. You may make it perform valve opening gradual change control at the time of frost start, and valve opening gradual change control at the time of heating return. Specifically, at the start of the normal cycle defrosting operation, when the superheated valve 27 that is fully closed is switched to the discharge temperature control at the time of defrosting, the overheating valve 27 is opened over several steps over 10 seconds to several tens of seconds.
- FIG. 10 illustrates the contents of applying the defrosting start valve opening gradual change control and the heating return valve opening gradual change control to the positive cycle defrosting operation (see FIG. 9) in the second modification. However, only the valve opening gradual change control at the start of defrosting may be applied. Further, the defrosting start valve opening gradual change control and the heating return valve opening gradual change control may be applied to the positive cycle defrosting operation (see FIG. 8) in the first modification.
- the opening degree of the main valve 24 and the superheat valve 27 is set to the target opening degree at the start of the normal cycle defrosting operation or at the time of returning from the normal cycle defrosting operation to the heating operation. (The valve opening gradual change control at the start of defrosting and the valve opening gradual change control at the time of heating return). For this reason, it is possible to suppress transient pressure fluctuations at the start of the normal cycle defrosting operation or when returning from the positive cycle defrosting operation to the heating operation. Thereby, the reliability of the compressor 21 can be ensured here.
- the defrosting start fan gradual change control for gradually changing the rotation speed of the indoor fan 42 is performed, so that the positive cycle defrosting operation is performed.
- the fan sudden change control at the time of heating return that suddenly changes the rotation speed of the indoor fan 42 may be performed.
- the rotation speed of the indoor fan 42 is set to the set rotation during the heating operation over several stages over 10 seconds to several tens of seconds.
- the fan gradual change control at the time of defrosting that gradually changes from the number to the defrosting rotation speed is performed, and when returning from the normal cycle defrosting operation to the heating operation, unlike the start of the normal cycle defrosting operation, the indoor fan 42 It is also possible to perform fan sudden change control at the time of heating return, in which the rotation speed is rapidly changed from the defrosting rotation speed to the set rotation speed during heating operation. Note that the control of other devices (the superheat valve 27, the main valve 24, the compressor 21, and the outdoor fan 25) during the positive cycle defrosting operation is the same as in the third modification.
- the rotational speed of the indoor fan 42 is gradually changed (fan gradual change control at the start of defrosting) at the start of the normal cycle defrosting operation.
- the rotation speed of the indoor fan is suddenly changed (fan sudden change control at the time of heating return). For this reason, the transient pressure fluctuation at the start of the forward cycle defrosting operation is further suppressed, and the operation of the indoor fan 42 is promptly returned to the heating operation, and priority is given to improving indoor comfort. Can do.
- the present invention has a discharge-suction bypass circuit used during a positive cycle defrosting operation for defrosting the outdoor heat exchanger while circulating the refrigerant in the order of the compressor, the indoor heat exchanger, the main valve, and the outdoor heat exchanger. Widely applicable to air conditioners.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
図1は、本発明の一実施形態にかかる空気調和装置1の概略構成図である。
室内ユニット4は、室内に設置されており、冷媒回路10の一部を構成している。室内ユニット4は、主として、室内熱交換器41を有している。
室外ユニット2は、室外に設置されており、冷媒回路10の一部を構成している。室外ユニット2は、主として、圧縮機21と、四路切換弁22と、室外熱交換器23と、主弁24と、吐出-吸入バイパス回路26とを有している。
冷媒連絡管5、6は、空気調和装置1を建物等の設置場所に設置する際に、現地にて施工される冷媒管であり、設置場所や室外ユニットと室内ユニットとの組み合わせ等の設置条件に応じて種々の長さや管径を有するものが使用される。
空気調和装置1は、室内側制御部43と室外側制御部28とから構成される制御部8によって、室外ユニット2及び室内ユニット4の各機器の制御を行うことができるようになっている。すなわち、室内側制御部43と室外側制御部28との間を接続する伝送線7とによって、暖房運転等を含む空気調和装置1全体の運転制御を行う制御部8が構成されている。
次に、空気調和装置1の動作について、図3~図6を用いて説明する。空気調和装置1は、冷房運転(図3参照)及び暖房運転(図4参照)を行うことが可能である。また、暖房運転時においては、室外熱交換器23に付着した霜を融解させるための正サイクル除霜運転(図5及び図6参照)を行うことも可能である。
冷房運転時には、四路切換弁22が冷房サイクル状態(図3の実線で示される状態)に切り換えられる。また、吐出-吸入バイパス回路26の過熱弁27は閉止されている。
暖房運転時には、四路切換弁22が暖房サイクル状態(図4の破線で示される状態)に切り換えられる。
-基本動作-
上記の暖房運転時において、室外熱交換器23における冷媒の温度Txoが所定温度よりも低くなること等によって室外熱交換器23における着霜が検知された場合には、室外熱交換器23に付着した霜を融解させる正サイクル除霜運転を行い、室外熱交換器23に付着した霜が融解した後に、暖房運転に復帰するようになっている。ここで、室外熱交換器23に付着した霜が融解したかどうかの検知は、室外熱交換器23における冷媒の温度Txoが所定温度よりも高くなること等によって行われる。
正サイクル除霜運転時において、従来と同様に、主弁24を全開近くまで開いた状態にすると、冷凍サイクルの高圧が十分に上昇しにくくなり、圧縮機21への投入動力が減少してしまい、その結果、除霜に使用できる熱量が減少して、圧縮機21への液バックの増加、さらなる冷凍サイクルの高圧の低下、圧縮機21への投入動力の減少という悪循環に陥りやすくなる。そして、このような悪循環によって、正サイクル除霜運転を継続できなくなるおそれがある。
上記の正サイクル除霜運転には、以下のような特徴がある。
上記の実施形態では、吐出-吸入バイパス回路26の過熱弁27として電磁弁等の開閉制御が可能な弁を使用しているが、これに代えて、図7に示すように、電動膨張弁等の開度制御が可能な弁を使用するようにしてもよい。この場合においても、上記の実施形態と同様の正サイクル除霜運転を行うことができる。
上記の実施形態及び変形例1では、正サイクル除霜運転中、室外ファン25を常に停止させるようにしているが、正サイクル除霜運転中の運転状況に応じて室外ファン25を運転するようにしてもよい。
上記の変形例1、2では、正サイクル除霜運転の開始時や正サイクル除霜運転から暖房運転への復帰時に、主弁24及び過熱弁27の制御の切り換えが行われるが、このとき、冷媒回路10において、過渡的な圧力変動が極力発生しないようにすることが好ましい。
上記の変形例3では、正サイクル除霜運転の開始時や正サイクル除霜運転から暖房運転への復帰時に、主弁24及び過熱弁27の制御の切り換えとともに、室内ファン42の運転も切り換えられる。
11 主冷媒回路
21 圧縮機
23 室外熱交換器
24 主弁
25 室外ファン
26 吐出-吸入バイパス回路
27 過熱弁
41 室内熱交換器
53 室外熱交温度センサ
55 室内熱交温度センサ
Claims (6)
- 圧縮機(21)と室内熱交換器(41)と主弁(24)と室外熱交換器(23)とを有しており、前記圧縮機、前記室内熱交換器、前記主弁、前記室外熱交換器の順に冷媒を循環させる暖房運転を行うことが可能な主冷媒回路(11)と、
過熱弁(27)を有しており、前記暖房運転時に前記圧縮機の吐出側から前記圧縮機の吸入側に冷媒をバイパスすることが可能になるように前記主冷媒回路に接続されている吐出-吸入バイパス回路(26)と、
を備えており、
前記圧縮機、前記室内熱交換器、前記主弁、前記室外熱交換器の順に冷媒を循環させつつ前記室外熱交換器を除霜する正サイクル除霜運転時に、前記過熱弁を開けて前記吐出-吸入バイパス回路を通じて前記圧縮機の吐出側から前記圧縮機の吸入側に冷媒をバイパスさせるとともに、前記主冷媒回路における冷凍サイクルの高圧が目標高圧になるように前記主弁の開度を調節する除霜時主弁高圧制御を行う、
空気調和装置(1)。 - 前記目標高圧を前記暖房運転時における前記高圧の上限値付近の値に設定する、
請求項1に記載の空気調和装置(1)。 - 前記高圧を前記室内熱交換器(41)に設けられた室内熱交温度センサ(55)によって検出される冷媒の温度から得る、
請求項1又は2に記載の空気調和装置(1)。 - 前記暖房運転時に、前記圧縮機(21)の吐出側の冷媒の温度に基づいて前記主弁(24)の開度を調節する暖房時主弁吐出温度制御を行う、
請求項1~3のいずれか1項に記載の空気調和装置(1)。 - 前記正サイクル除霜運転時に、前記圧縮機(21)の吐出側の冷媒の過熱度が目標吐出過熱度になるように前記過熱弁(27)の開度を調節する除霜時吐出温度制御を行う、
請求項1~4のいずれか1項に記載の空気調和装置(1)。 - 前記室外熱交換器(23)に空気を供給する室外ファン(25)をさらに備えており、
前記正サイクル除霜運転時に、前記室外熱交換器に設けられた室外熱交温度センサ(53)によって検出される冷媒の温度が外気温度付近の値であるファン発停温度まで上昇していない場合には前記室外ファンを運転し、前記ファン発停温度まで上昇した場合には前記室外ファンを停止させる除霜時室外ファン制御を行う、
請求項1~5のいずれか1項に記載の空気調和装置(1)。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14849976.7A EP3054239B1 (en) | 2013-09-30 | 2014-09-25 | Air conditioner |
CN201480053400.7A CN105579794B (zh) | 2013-09-30 | 2014-09-25 | 空调装置 |
US15/025,240 US10168088B2 (en) | 2013-09-30 | 2014-09-25 | Air conditioning device having bypass and being operable in a positive cycle defrosting mode |
ES14849976T ES2709979T3 (es) | 2013-09-30 | 2014-09-25 | Acondicionador de aire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013-203368 | 2013-09-30 | ||
JP2013203368A JP5929862B2 (ja) | 2013-09-30 | 2013-09-30 | 空気調和装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015046350A1 true WO2015046350A1 (ja) | 2015-04-02 |
Family
ID=52743481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2014/075466 WO2015046350A1 (ja) | 2013-09-30 | 2014-09-25 | 空気調和装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US10168088B2 (ja) |
EP (1) | EP3054239B1 (ja) |
JP (1) | JP5929862B2 (ja) |
CN (1) | CN105579794B (ja) |
ES (1) | ES2709979T3 (ja) |
WO (1) | WO2015046350A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020051667A (ja) * | 2018-09-26 | 2020-04-02 | 東芝キヤリア株式会社 | 空気調和機 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5999171B2 (ja) * | 2014-12-26 | 2016-09-28 | ダイキン工業株式会社 | 空気調和装置 |
CN105972772B (zh) * | 2016-05-30 | 2019-08-27 | 广东美的制冷设备有限公司 | 空调器的除霜控制方法及装置 |
JP2018091536A (ja) | 2016-12-01 | 2018-06-14 | 株式会社デンソー | 冷凍サイクル装置 |
CN107023945A (zh) * | 2017-04-01 | 2017-08-08 | 青岛海尔空调电子有限公司 | 空调系统及用于空调系统的控制方法 |
JP6935720B2 (ja) * | 2017-10-12 | 2021-09-15 | ダイキン工業株式会社 | 冷凍装置 |
JP7303413B2 (ja) * | 2018-09-28 | 2023-07-05 | ダイキン工業株式会社 | ヒートポンプ装置 |
JP7162173B2 (ja) | 2019-03-28 | 2022-10-28 | パナソニックIpマネジメント株式会社 | 空気調和装置 |
US20220186993A1 (en) * | 2019-05-21 | 2022-06-16 | Mitsubishi Electric Corporation | Air-conditioning apparatus |
JP7382118B2 (ja) * | 2019-09-04 | 2023-11-16 | 株式会社デンソー | 車両用空調装置 |
DE112019007729T5 (de) * | 2019-09-20 | 2022-06-02 | Mitsubishi Electric Corporation | Klimaanlage |
JP2022006650A (ja) * | 2020-06-24 | 2022-01-13 | 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 |
CN113883659A (zh) * | 2021-09-28 | 2022-01-04 | 青岛海尔中央空调有限公司 | 空调器控制方法、控制装置及空调器 |
JP2024051573A (ja) * | 2022-09-30 | 2024-04-11 | ダイキン工業株式会社 | 固体冷凍装置 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61262560A (ja) | 1985-05-15 | 1986-11-20 | 松下電器産業株式会社 | ヒ−トポンプ式空調機 |
JPS62138660A (ja) * | 1985-12-13 | 1987-06-22 | 株式会社日立製作所 | 空気調和機 |
JP2004198027A (ja) * | 2002-12-18 | 2004-07-15 | Denso Corp | 蒸気圧縮式冷凍機 |
WO2007013382A1 (ja) * | 2005-07-26 | 2007-02-01 | Mitsubishi Electric Corporation | 冷凍空調装置 |
JP2010139097A (ja) * | 2008-12-09 | 2010-06-24 | Mitsubishi Electric Corp | 空気調和機 |
JP2011102678A (ja) * | 2009-11-11 | 2011-05-26 | Daikin Industries Ltd | ヒートポンプ装置 |
JP2013053782A (ja) * | 2011-09-02 | 2013-03-21 | Sharp Corp | 空気調和機 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4286435A (en) | 1978-10-02 | 1981-09-01 | Carrier Corporation | Hot gas defrost system |
JPH07243728A (ja) * | 1994-03-03 | 1995-09-19 | Hitachi Ltd | 空気調和機 |
JP4731806B2 (ja) * | 2003-12-01 | 2011-07-27 | パナソニック株式会社 | 冷凍サイクル装置およびその制御方法 |
-
2013
- 2013-09-30 JP JP2013203368A patent/JP5929862B2/ja active Active
-
2014
- 2014-09-25 WO PCT/JP2014/075466 patent/WO2015046350A1/ja active Application Filing
- 2014-09-25 ES ES14849976T patent/ES2709979T3/es active Active
- 2014-09-25 EP EP14849976.7A patent/EP3054239B1/en active Active
- 2014-09-25 CN CN201480053400.7A patent/CN105579794B/zh active Active
- 2014-09-25 US US15/025,240 patent/US10168088B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61262560A (ja) | 1985-05-15 | 1986-11-20 | 松下電器産業株式会社 | ヒ−トポンプ式空調機 |
JPS62138660A (ja) * | 1985-12-13 | 1987-06-22 | 株式会社日立製作所 | 空気調和機 |
JP2004198027A (ja) * | 2002-12-18 | 2004-07-15 | Denso Corp | 蒸気圧縮式冷凍機 |
WO2007013382A1 (ja) * | 2005-07-26 | 2007-02-01 | Mitsubishi Electric Corporation | 冷凍空調装置 |
JP2010139097A (ja) * | 2008-12-09 | 2010-06-24 | Mitsubishi Electric Corp | 空気調和機 |
JP2011102678A (ja) * | 2009-11-11 | 2011-05-26 | Daikin Industries Ltd | ヒートポンプ装置 |
JP2013053782A (ja) * | 2011-09-02 | 2013-03-21 | Sharp Corp | 空気調和機 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020051667A (ja) * | 2018-09-26 | 2020-04-02 | 東芝キヤリア株式会社 | 空気調和機 |
JP7096117B2 (ja) | 2018-09-26 | 2022-07-05 | 東芝キヤリア株式会社 | 空気調和機 |
Also Published As
Publication number | Publication date |
---|---|
US20160238297A1 (en) | 2016-08-18 |
EP3054239A1 (en) | 2016-08-10 |
CN105579794A (zh) | 2016-05-11 |
CN105579794B (zh) | 2017-08-04 |
EP3054239B1 (en) | 2018-11-07 |
EP3054239A4 (en) | 2017-05-31 |
JP2015068567A (ja) | 2015-04-13 |
JP5929862B2 (ja) | 2016-06-08 |
ES2709979T3 (es) | 2019-04-22 |
US10168088B2 (en) | 2019-01-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5929862B2 (ja) | 空気調和装置 | |
JP5783215B2 (ja) | 空気調和装置 | |
JP5182358B2 (ja) | 冷凍装置 | |
AU2012392672B2 (en) | Air conditioning apparatus | |
AU2012392673B2 (en) | Air conditioning apparatus | |
WO2015122056A1 (ja) | 空気調和装置 | |
WO2019017299A1 (ja) | 空調システム | |
CN109790995B (zh) | 空调装置 | |
WO2014199788A1 (ja) | 空気調和装置 | |
US10753658B2 (en) | Air-conditioning apparatus | |
WO2015045685A1 (ja) | 空気調和装置 | |
JP6123289B2 (ja) | 空気調和システム | |
WO2015046228A1 (ja) | 空気調和装置 | |
JP2016133257A (ja) | 空気調和装置 | |
JP5517891B2 (ja) | 空気調和装置 | |
CN106705496A (zh) | 一种微通道空调器及其控制方法 | |
JP2015068570A (ja) | 空気調和装置 | |
JP2015068608A (ja) | 空気調和装置 | |
WO2015046230A1 (ja) | 空気調和装置 | |
WO2013172196A1 (ja) | 空気調和装置 | |
JP2014126289A (ja) | 空気調和システム | |
JP2020024058A (ja) | 複合熱源ヒートポンプ装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201480053400.7 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14849976 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15025240 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2014849976 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014849976 Country of ref document: EP |