EP3321603B1 - Air conditioning device - Google Patents
Air conditioning device Download PDFInfo
- Publication number
- EP3321603B1 EP3321603B1 EP16908357.3A EP16908357A EP3321603B1 EP 3321603 B1 EP3321603 B1 EP 3321603B1 EP 16908357 A EP16908357 A EP 16908357A EP 3321603 B1 EP3321603 B1 EP 3321603B1
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- EP
- European Patent Office
- Prior art keywords
- outdoor
- unit
- air temperature
- controller
- outdoor air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004378 air conditioning Methods 0.000 title claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 35
- 238000005259 measurement Methods 0.000 claims description 31
- 238000004891 communication Methods 0.000 claims description 14
- 239000003507 refrigerant Substances 0.000 description 28
- 238000000034 method Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Images
Classifications
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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
-
- 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
- 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
- F25B2400/01—Heaters
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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
- F25B2500/00—Problems to be solved
- F25B2500/14—Problems to be solved the presence of moisture in a refrigeration component or cycle
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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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
Definitions
- the present invention relates to an air-conditioning apparatus capable of reducing power consumption when an operation of a compressor is stopped.
- a compressor provided to an outdoor unit of an air-conditioning apparatus in low temperature, such as when the outdoor air temperature is below zero, has a problem that refrigerant accumulating inside the compressor is condensed and liquefied to cause so-called refrigerant liquefaction in which a large amount of liquefied refrigerant dissolves into lubricating oil of the compressor.
- a compressor when heating operation is started in an air-conditioning apparatus, a compressor is immediately activated and starts compression of refrigerant; however, at the time of activation, since the temperature of the compressor is close to outdoor air temperature, the temperature of refrigerant discharged from the compressor is not raised until the temperature of the compressor is raised sufficiently. If it takes time to raise the temperature of refrigerant, it takes time, also, to raise temperature of an indoor heat exchanger; accordingly, there is a problem that it takes time to raise the indoor temperature to a predetermined temperature and rapid heating cannot be performed.
- a heater is provided to the compressor and the heater is always energized, when operation of the compressor is stopped, to thereby heat the compressor.
- the compressor is heated by energizing the heater all the time during suspension of operation of the compressor, there is a problem that power consumption in the heater is increased, and power consumption during suspension of operation of the compressor, namely, so called standby power is increased.
- Patent Literature 1 in a detection mode, the temperature of the compressor is measured to calculate a change rate of temperature of the compressor being stopped, by use of the measured temperature of the compressor, and a period of operation in a sleep mode, which consumes less power than the detection mode, is varied in accordance with the calculation result. Then, a heating unit is energized in accordance with the temperature of the compressor taken in the detection mode. Consequently, by appropriately heating the compressor by the heating unit, it is possible to reduce power consumption in the controller while suppressing refrigerant liquefaction inside the compressor.
- Patent Literature 2 and Patent Literature 3 further help understanding the current invention.
- EP2051024 A1 discloses an air-conditioning apparatus according to the preamble of claim 1.
- Patent Literature 1 in accordance with the change rate of temperature of the compressor being stopped, the time period of the sleep mode, which consumes less power than the detection mode, is extended to reduce power consumption. However, even in the sleep mode, power feeding to the outdoor unit is performed, and therefore, there was a problem that the power was consumed by that amount.
- the present invention has been made to overcome the above problem, and has an object to provide an air-conditioning apparatus with improved energy saving performance.
- an outdoor controller when a power feeding ON signal is received from an indoor controller during a power feeding OFF time of an outdoor unit, an outdoor controller turns on power feeding to the outdoor unit and determines heating necessity of a compressor, and then turns off the power feeding to the outdoor unit when it is determined that heating of the compressor is unnecessary. Therefore, it is possible to turn OFF the power feeding to the outdoor unit until the power feeding ON signal is received from the indoor controller, to thereby improve the energy saving performance.
- Fig. 1 is a refrigerant circuit diagram of an air-conditioning apparatus 100 related to an embodiment of the present invention.
- the air-conditioning apparatus 100 includes an indoor unit 1 and an outdoor unit 2.
- the indoor unit 1 includes an indoor heat exchanger 5, and has a function of cooling or heating an air-conditioning target space, such as indoors, by heating energy or cooling energy supplied from the outdoor unit 2.
- the indoor heat exchanger 5 functions as an evaporator in cooling operation and as a condenser or a radiator in heating operation, to exchange heat between refrigerant and air.
- the outdoor unit 2 includes a compressor 3, a flow path switching valve 4, an expansion device 6, an outdoor heat exchanger 7 and an outdoor air temperature detector 8, and has a function of supplying heating energy or cooling energy to the indoor unit 1.
- the compressor 3 compresses sucked refrigerant to bring it into a state of high temperature and high pressure.
- the flow path switching valve 4 switches a flow of refrigerant between the cooling operation and the heating operation. Note that the flow path switching valve 4 is exemplified as a four-way valve; however, the flow path switching valve 4 may be composed by combining a two-way valve, a three-way valve or other valves.
- the expansion device 6 functions as a pressure-reducing valve or an expansion valve to reduce pressure of refrigerant and expands thereof.
- the outdoor heat exchanger 7 functions as a condenser or a radiator in cooling operation and as an evaporator in heating operation, to exchange heat between refrigerant and air supplied from a fan (not shown).
- the outdoor air temperature detector 8 is, for example, a thermistor, an infrared temperature sensor or others, to detect an outdoor air temperature.
- the air-conditioning apparatus 100 related to the embodiment includes a refrigerant circuit in which the compressor 3, the flow path switching valve 4, the indoor heat exchanger 5, the expansion device 6 and the outdoor heat exchanger are sequentially connected via pipes to allow refrigerant to circulate.
- the air-conditioning apparatus 100 is configured to perform cooling operation or heating operation by circulating refrigerant in the refrigerant circuit.
- the indoor unit 1 includes the indoor controller 10 and the outdoor unit 2 includes the outdoor controller 20.
- the indoor controller 10 and the outdoor controller 20 are composed of, for example, dedicated hardware or a CPU (also referred to as a Central Processing Unit, a processing device, a computer, a microprocessor, a microcomputer or a processor) executing programs loaded in a memory.
- a CPU also referred to as a Central Processing Unit, a processing device, a computer, a microprocessor, a microcomputer or a processor
- Fig. 2 is a functional block diagram of the air-conditioning apparatus 100 related to the embodiment according to the present invention.
- the indoor controller 10 includes an indoor communication unit 11 configured to communicate with the outdoor controller 20 and an indoor measurement unit 12 for measuring time.
- the outdoor controller 20 includes an outdoor communication unit 21 communicating with the indoor controller 10, a power supply management unit 22 for turning ON or OFF the power feeding to the outdoor unit 2 and a measurement unit 23 for obtaining a signal of the outdoor air temperature detected by the outdoor air temperature detector 8. Moreover, the outdoor controller 20 includes a storage unit 24 for storing the outdoor air temperature obtained by the measurement unit 23 and a computation unit 25 for computing, from the current outdoor air temperature obtained by the measurement unit 23 and the past outdoor air temperature stored in the storage unit 24, a predicted outdoor air temperature after an elapse of a certain period of time (hereinafter, referred to as a predicted outdoor air temperature).
- a predicted outdoor air temperature a predicted outdoor air temperature after an elapse of a certain period of time
- a determination unit 26 for determining whether or not the predicted outdoor air temperature computed by the computation unit 25 is higher than the current outdoor air temperature obtained by the measurement unit 23, a drive unit 27 for performing rotation-locked energization when the determination unit 26 determines that the predicted outdoor air temperature is higher than the current outdoor air temperature, and an outdoor measurement unit 28 for measuring time are included.
- the rotation-locked energization is to energize the compressor 3 to electrically heat the compressor 3.
- the outdoor controller 20 has a power supply system different from other components of the outdoor unit 2; therefore, the outdoor controller 20 can communicate with the indoor controller 10 even though power feeding to the outdoor unit 2 is turned off.
- the outdoor unit 2 is provided with the outdoor controller 20; however, the present invention is not limited thereto, and the outdoor controller 20 may be provided separately from the outdoor unit 2.
- the flow path switching valve 4 is switched to the cooling operation side, in other words, as indicated by the solid line in Fig. 1 , switched so that the discharge side of the compressor 3 and the outdoor heat exchanger 7 are connected.
- the gas refrigerant of high temperature and pressure discharged from the compressor 3 passes through the flow path switching valve 4 and is subjected to heat exchange with outdoor air blown by a fan (not shown) in the outdoor heat exchanger 7 to be condensed and liquefied.
- the refrigerant condensed and liquefied is subjected to pressure reduction to low pressure by the expansion device 6, and thereafter, subjected to heat exchange with indoor air in the indoor heat exchanger 5 to be evaporated and gasified. Then, the refrigerant brought into a gas state passes through the flow path switching valve 4 and is sucked into the compressor 3.
- the flow path switching valve 4 is switched to the heating operation side, in other words, as indicated by the broken line in Fig. 1 , switched so that the suction side of the compressor 3 and the outdoor heat exchanger 7 are connected.
- the gas refrigerant of high temperature and high pressure discharged from the compressor 3 passes through the flow path switching valve 4 and is subjected to heat exchange with indoor air in the indoor heat exchanger 5 to be condensed and liquefied.
- the refrigerant condensed and liquefied is subjected to pressure reduction to low pressure by the expansion device 6.
- the pressure-reduced refrigerant is subjected to heat exchange with outdoor air blown by a fan (not shown) in the outdoor heat exchanger 7 to be evaporated and gasified. Then, the refrigerant brought into a gas state passes through the flow path switching valve 4 and is sucked into the compressor 3.
- Fig. 3 is a first diagram showing timing of rotation-locked energization and power feeding to the outdoor unit under operation stop of the compressor 3 in the air-conditioning apparatus 100 according to an embodiment of the present invention
- Fig. 4 is a second diagram showing timing of rotation-locked energization and power feeding to the outdoor unit under operation stop of the compressor 3 in the air-conditioning apparatus 100 according to an embodiment of the present invention.
- the air-conditioning apparatus 100 related to the embodiment performs rotation-locked energization in response to the outdoor air temperature to suppress refrigerant liquefaction inside the compressor 3 under operation stop of the compressor 3. Specifically, when the outdoor air temperature tends rise, and thereby rise in the outdoor air temperature is predicted, rotation-locked energization is performed, and in other cases rotation-locked energization is not performed.
- the air-conditioning apparatus 100 related to the embodiment determines whether or not the rotation-locked energization is to be performed based on heating necessity determination described as follows.
- the air-conditioning apparatus 100 obtains the outdoor air temperature every certain period of time (in the embodiment, assumed to be N minutes), and stores the obtained outdoor air temperature in the storage unit 24 each time. Then, from the current outdoor air temperature and the past outdoor air temperature, for example, the outdoor air temperatures N minutes before and 2N minutes before, the outdoor air temperature after N minutes is calculated as a predicted outdoor air temperature by an approximate expression. When the calculated predicted outdoor air temperature is higher than the current outdoor air temperature, it is predicted that the outdoor air temperature tends to be raised, and the rotation-locked energization is turned on. On the other hand, when the calculated predicted outdoor air temperature is not higher than the current outdoor air temperature, it is predicted that the outdoor air temperature does not tend to be raised, and the rotation-locked energization is not performed.
- the air-conditioning apparatus 100 turns off the power feeding to the outdoor unit 2.
- the indoor unit 1 measures the time from turning off the power feeding to the outdoor unit 2, and transmits a power feeding ON signal to the outdoor unit 2 at every timing of performing the heating necessity determination, namely, every N minutes, to turn on the power feeding to the outdoor unit 2.
- the outdoor unit 2 performs heating necessity determination. In other words, the outdoor unit 2 repeatedly performs the heating necessity determination at every N minutes.
- the air-conditioning apparatus 100 can improve the energy saving performance.
- Fig. 5 is a flowchart showing a process flow of heating control of the compressor on the outdoor controller 20 side under operation stop of the compressor 3 in the air-conditioning apparatus 100 related to the embodiment of the present invention
- Fig. 6 is a flowchart showing a process flow of heating control of the compressor on the indoor controller 10 side under operation stop of the compressor 3 in the air-conditioning apparatus 100 related to the embodiment of the present invention.
- the measurement unit 23 of the outdoor controller 20 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 (step S101). Note that the outdoor air temperature obtained by the measurement unit 23 is stored in the storage unit 24. Moreover, the process of obtaining a signal of outdoor air temperature by the measurement unit 23 is performed every certain period of time, and the obtained outdoor air temperature is stored in the storage unit 24 each time.
- step S101 from the current outdoor air temperature obtained by the measurement unit 23 and the past outdoor air temperature stored in the storage unit 24, the computation unit 25 calculates the outdoor air temperature after a certain period of time as the predicted outdoor air temperature by an approximate expression (step S102).
- the determination unit 26 performs heating necessity determination to determine whether or not the predicted outdoor air temperature calculated by the computation unit 25 is higher than the current outdoor air temperature (step S103).
- the outdoor measurement unit 28 starts time measurement (step S108), and the drive unit 27 turns on the rotation-locked energization (step S109).
- step S109 when a certain period of time measured by the outdoor measurement unit 28 has passed, in other words, a certain period of time in which the rotation-locked energization is ON has passed (Yes in step S110), the process returns to step S101 and the measurement unit 23 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 again (step S101).
- the outdoor communication unit 21 transmits a power feeding OFF signal to the indoor communication unit 11 of the indoor controller 10 (step S104), and the power supply management unit 22 turns off the power feeding to the outdoor unit 2 (step S105).
- the drive unit 27 turns off the rotation-locked energization.
- step S202 when the indoor communication unit 11 receives the power feeding OFF signal from the outdoor communication unit 21 (Yes in step S201), the indoor measurement unit 12 starts measurement of time (step S202).
- step S202 when a certain period of time measured by the indoor measurement unit 12 has passed, in other words, when a certain period of time has passed since turning off the power feeding to the outdoor unit 2 (Yes in step S203), the indoor communication unit 11 transmits the power feeding ON signal to the outdoor communication unit 21 of the outdoor controller 20 (step S204), and the process returns to step S201.
- step S105 when the outdoor communication unit 21 receives the power feeding ON signal from the indoor communication unit 11 (Yes in step S106), the power supply management unit 22 turns on the power feeding to the outdoor unit 2 (step S107), the process returns to step S101, and the measurement unit 23 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 again (step S101).
- the outdoor controller 20 obtains the current outdoor air temperature and calculates, from the current outdoor air temperature and the past outdoor air temperature stored in the storage unit 24, a predicted outdoor air temperature, which is an outdoor air temperature in future. Then, when it is determined that the predicted outdoor air temperature is higher than the current outdoor air temperature, in other words, when it is predicted that the outdoor air temperature tends to rise, the outdoor controller 20 starts measurement of time and turns on the rotation-locked energization.
- the outdoor controller 20 transmits the power feeding OFF signal to the indoor controller 10 to turn off the power feeding to the outdoor unit 2.
- the indoor controller 10 starts measurement of time, and when a certain period of measured time has passed, transmits the power feeding ON signal to the outdoor controller 20.
- the outdoor controller 20 turns on the power feeding to the outdoor unit 2, and obtains the current outdoor air temperature again.
- the outdoor controller 20 turns off power feeding to the outdoor unit 2 during a period in which the compressor 3 is not heated, turns on the power feeding to the outdoor unit 2 when the power feeding ON signal is received from the indoor controller 10 during the time when the power feeding to the outdoor unit 2 is off, and determines heating necessity of the compressor 3 and then turns off the power feeding to the outdoor unit 2 when it is determined that heating of the compressor 3 is unnecessary. Therefore, it is possible to turn off the power feeding to the outdoor unit until the power feeding ON signal is received from the indoor controller 10, and to improve the energy saving performance.
- indoor unit 2 outdoor unit 3 compressor 4 flow path switching valve 5 indoor heat exchanger 6 expansion device 7 outdoor heat exchanger 8 outdoor air temperature detector 10 indoor controller 11 indoor communication unit 12 indoor measurement unit 20 outdoor controller 21 outdoor communication unit 22 power supply management unit 23 measurement unit 24 storage unit 25 computation unit 26 determination unit 27 drive unit 28 outdoor measurement unit 100 air-conditioning apparatus
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Description
- The present invention relates to an air-conditioning apparatus capable of reducing power consumption when an operation of a compressor is stopped.
- Conventionally, a compressor provided to an outdoor unit of an air-conditioning apparatus, in low temperature, such as when the outdoor air temperature is below zero, has a problem that refrigerant accumulating inside the compressor is condensed and liquefied to cause so-called refrigerant liquefaction in which a large amount of liquefied refrigerant dissolves into lubricating oil of the compressor.
- Moreover, when heating operation is started in an air-conditioning apparatus, a compressor is immediately activated and starts compression of refrigerant; however, at the time of activation, since the temperature of the compressor is close to outdoor air temperature, the temperature of refrigerant discharged from the compressor is not raised until the temperature of the compressor is raised sufficiently. If it takes time to raise the temperature of refrigerant, it takes time, also, to raise temperature of an indoor heat exchanger; accordingly, there is a problem that it takes time to raise the indoor temperature to a predetermined temperature and rapid heating cannot be performed.
- As a method to overcome the above problem, that is, as a method to achieve the rapid heating and to suppress refrigerant liquefaction inside a compressor in low outdoor temperature, it can be considered that a heater is provided to the compressor and the heater is always energized, when operation of the compressor is stopped, to thereby heat the compressor. However, like the method, if the compressor is heated by energizing the heater all the time during suspension of operation of the compressor, there is a problem that power consumption in the heater is increased, and power consumption during suspension of operation of the compressor, namely, so called standby power is increased.
- Therefore, air-conditioning apparatus capable of, while preventing refrigerant liquefaction inside a compressor, reducing standby power by reducing power consumption in a controller is suggested (see, for example, Patent Literature 1).
- In
Patent Literature 1, in a detection mode, the temperature of the compressor is measured to calculate a change rate of temperature of the compressor being stopped, by use of the measured temperature of the compressor, and a period of operation in a sleep mode, which consumes less power than the detection mode, is varied in accordance with the calculation result. Then, a heating unit is energized in accordance with the temperature of the compressor taken in the detection mode. Consequently, by appropriately heating the compressor by the heating unit, it is possible to reduce power consumption in the controller while suppressing refrigerant liquefaction inside the compressor. -
Patent Literature 2 andPatent Literature 3 further help understanding the current invention. - The document
EP2051024 A1 discloses an air-conditioning apparatus according to the preamble ofclaim 1. -
- Patent Literature 1: Japanese Unexamined Patent Application Publication No.
2013-204979 - Patent Literature 2:
European Patent Application 2 051 024 A1 - Patent Literature 3: Japanese Patent Application Publication No.
2014 145 535 - In
Patent Literature 1, in accordance with the change rate of temperature of the compressor being stopped, the time period of the sleep mode, which consumes less power than the detection mode, is extended to reduce power consumption. However, even in the sleep mode, power feeding to the outdoor unit is performed, and therefore, there was a problem that the power was consumed by that amount. - The present invention has been made to overcome the above problem, and has an object to provide an air-conditioning apparatus with improved energy saving performance.
- According to the present invention the above objective is solved by the features of
claim 1. - According to an embodiment of the present invention, when a power feeding ON signal is received from an indoor controller during a power feeding OFF time of an outdoor unit, an outdoor controller turns on power feeding to the outdoor unit and determines heating necessity of a compressor, and then turns off the power feeding to the outdoor unit when it is determined that heating of the compressor is unnecessary. Therefore, it is possible to turn OFF the power feeding to the outdoor unit until the power feeding ON signal is received from the indoor controller, to thereby improve the energy saving performance.
-
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Fig. 1 is a refrigerant circuit diagram of an air-conditioning apparatus related to an embodiment of the present invention. -
Fig. 2 is a functional block diagram of the air-conditioning apparatus related to the embodiment according to the present invention. -
Fig. 3 is a first diagram showing timing of rotation-locked energization and power feeding to an outdoor unit under operation stop of a compressor in the air-conditioning apparatus related to the present invention. -
Fig. 4 is a second diagram showing timing of rotation-locked energization and power feeding to the outdoor unit under operation stop of the compressor in the air-conditioning apparatus related to the present invention. -
Fig. 5 is a flowchart showing a process flow of heating control of the compressor on an outdoor controller side under operation stop of the compressor in the air-conditioning apparatus related to the embodiment of the present invention. -
Fig. 6 is a flowchart showing a process flow of heating control of the compressor on an indoor controller side under operation stop of the compressor in the air-conditioning apparatus related to the embodiment of the present invention. - Hereinafter, an embodiment according to the present invention will be described based on drawings. Note that the embodiment to be described below does not limit the present invention. Moreover, in the following figures, relations between sizes of respective components in the following figures may be different from those in actual ones.
-
Fig. 1 is a refrigerant circuit diagram of an air-conditioning apparatus 100 related to an embodiment of the present invention. - As shown in
Fig. 1 , the air-conditioning apparatus 100 includes anindoor unit 1 and anoutdoor unit 2. - The
indoor unit 1 includes an indoor heat exchanger 5, and has a function of cooling or heating an air-conditioning target space, such as indoors, by heating energy or cooling energy supplied from theoutdoor unit 2. - The indoor heat exchanger 5 functions as an evaporator in cooling operation and as a condenser or a radiator in heating operation, to exchange heat between refrigerant and air.
- The
outdoor unit 2 includes acompressor 3, a flowpath switching valve 4, anexpansion device 6, an outdoor heat exchanger 7 and an outdoor air temperature detector 8, and has a function of supplying heating energy or cooling energy to theindoor unit 1. - The
compressor 3 compresses sucked refrigerant to bring it into a state of high temperature and high pressure. The flowpath switching valve 4 switches a flow of refrigerant between the cooling operation and the heating operation. Note that the flowpath switching valve 4 is exemplified as a four-way valve; however, the flowpath switching valve 4 may be composed by combining a two-way valve, a three-way valve or other valves. - The
expansion device 6 functions as a pressure-reducing valve or an expansion valve to reduce pressure of refrigerant and expands thereof. The outdoor heat exchanger 7 functions as a condenser or a radiator in cooling operation and as an evaporator in heating operation, to exchange heat between refrigerant and air supplied from a fan (not shown). The outdoor air temperature detector 8 is, for example, a thermistor, an infrared temperature sensor or others, to detect an outdoor air temperature. - Moreover, the air-
conditioning apparatus 100 related to the embodiment includes a refrigerant circuit in which thecompressor 3, the flowpath switching valve 4, the indoor heat exchanger 5, theexpansion device 6 and the outdoor heat exchanger are sequentially connected via pipes to allow refrigerant to circulate. The air-conditioning apparatus 100 is configured to perform cooling operation or heating operation by circulating refrigerant in the refrigerant circuit. - Moreover, the
indoor unit 1 includes theindoor controller 10 and theoutdoor unit 2 includes theoutdoor controller 20. - The
indoor controller 10 and theoutdoor controller 20 are composed of, for example, dedicated hardware or a CPU (also referred to as a Central Processing Unit, a processing device, a computer, a microprocessor, a microcomputer or a processor) executing programs loaded in a memory. -
Fig. 2 is a functional block diagram of the air-conditioning apparatus 100 related to the embodiment according to the present invention. - As shown in
Fig. 2 , theindoor controller 10 includes anindoor communication unit 11 configured to communicate with theoutdoor controller 20 and anindoor measurement unit 12 for measuring time. - The
outdoor controller 20 includes an outdoor communication unit 21 communicating with theindoor controller 10, a powersupply management unit 22 for turning ON or OFF the power feeding to theoutdoor unit 2 and ameasurement unit 23 for obtaining a signal of the outdoor air temperature detected by the outdoor air temperature detector 8. Moreover, theoutdoor controller 20 includes a storage unit 24 for storing the outdoor air temperature obtained by themeasurement unit 23 and a computation unit 25 for computing, from the current outdoor air temperature obtained by themeasurement unit 23 and the past outdoor air temperature stored in the storage unit 24, a predicted outdoor air temperature after an elapse of a certain period of time (hereinafter, referred to as a predicted outdoor air temperature). Further, adetermination unit 26 for determining whether or not the predicted outdoor air temperature computed by the computation unit 25 is higher than the current outdoor air temperature obtained by themeasurement unit 23, adrive unit 27 for performing rotation-locked energization when thedetermination unit 26 determines that the predicted outdoor air temperature is higher than the current outdoor air temperature, and anoutdoor measurement unit 28 for measuring time are included. Note that the rotation-locked energization is to energize thecompressor 3 to electrically heat thecompressor 3. - The
outdoor controller 20 has a power supply system different from other components of theoutdoor unit 2; therefore, theoutdoor controller 20 can communicate with theindoor controller 10 even though power feeding to theoutdoor unit 2 is turned off. - Note that, in the embodiment, the
outdoor unit 2 is provided with theoutdoor controller 20; however, the present invention is not limited thereto, and theoutdoor controller 20 may be provided separately from theoutdoor unit 2. - Next, operations of the air-
conditioning apparatus 100 related to the embodiment will be described by use ofFig. 1 . - In the cooling operation, the flow
path switching valve 4 is switched to the cooling operation side, in other words, as indicated by the solid line inFig. 1 , switched so that the discharge side of thecompressor 3 and the outdoor heat exchanger 7 are connected. - The gas refrigerant of high temperature and pressure discharged from the
compressor 3 passes through the flowpath switching valve 4 and is subjected to heat exchange with outdoor air blown by a fan (not shown) in the outdoor heat exchanger 7 to be condensed and liquefied. The refrigerant condensed and liquefied is subjected to pressure reduction to low pressure by theexpansion device 6, and thereafter, subjected to heat exchange with indoor air in the indoor heat exchanger 5 to be evaporated and gasified. Then, the refrigerant brought into a gas state passes through the flowpath switching valve 4 and is sucked into thecompressor 3. - In the heating operation, the flow
path switching valve 4 is switched to the heating operation side, in other words, as indicated by the broken line inFig. 1 , switched so that the suction side of thecompressor 3 and the outdoor heat exchanger 7 are connected. - The gas refrigerant of high temperature and high pressure discharged from the
compressor 3 passes through the flowpath switching valve 4 and is subjected to heat exchange with indoor air in the indoor heat exchanger 5 to be condensed and liquefied. The refrigerant condensed and liquefied is subjected to pressure reduction to low pressure by theexpansion device 6. The pressure-reduced refrigerant is subjected to heat exchange with outdoor air blown by a fan (not shown) in the outdoor heat exchanger 7 to be evaporated and gasified. Then, the refrigerant brought into a gas state passes through the flowpath switching valve 4 and is sucked into thecompressor 3. -
Fig. 3 is a first diagram showing timing of rotation-locked energization and power feeding to the outdoor unit under operation stop of thecompressor 3 in the air-conditioning apparatus 100 according to an embodiment of the present invention, andFig. 4 is a second diagram showing timing of rotation-locked energization and power feeding to the outdoor unit under operation stop of thecompressor 3 in the air-conditioning apparatus 100 according to an embodiment of the present invention. - The air-
conditioning apparatus 100 related to the embodiment performs rotation-locked energization in response to the outdoor air temperature to suppress refrigerant liquefaction inside thecompressor 3 under operation stop of thecompressor 3. Specifically, when the outdoor air temperature tends rise, and thereby rise in the outdoor air temperature is predicted, rotation-locked energization is performed, and in other cases rotation-locked energization is not performed. - The air-
conditioning apparatus 100 related to the embodiment determines whether or not the rotation-locked energization is to be performed based on heating necessity determination described as follows. - As shown in
Fig. 3 , the air-conditioning apparatus 100 obtains the outdoor air temperature every certain period of time (in the embodiment, assumed to be N minutes), and stores the obtained outdoor air temperature in the storage unit 24 each time. Then, from the current outdoor air temperature and the past outdoor air temperature, for example, the outdoor air temperatures N minutes before and 2N minutes before, the outdoor air temperature after N minutes is calculated as a predicted outdoor air temperature by an approximate expression. When the calculated predicted outdoor air temperature is higher than the current outdoor air temperature, it is predicted that the outdoor air temperature tends to be raised, and the rotation-locked energization is turned on. On the other hand, when the calculated predicted outdoor air temperature is not higher than the current outdoor air temperature, it is predicted that the outdoor air temperature does not tend to be raised, and the rotation-locked energization is not performed. - Moreover, as shown in
Fig. 4 , when it is determined that the rotation-locked energization is not performed, the air-conditioning apparatus 100 turns off the power feeding to theoutdoor unit 2. Thereafter, theindoor unit 1 measures the time from turning off the power feeding to theoutdoor unit 2, and transmits a power feeding ON signal to theoutdoor unit 2 at every timing of performing the heating necessity determination, namely, every N minutes, to turn on the power feeding to theoutdoor unit 2. Then, every time the power feeding to theoutdoor unit 2 is turned on, theoutdoor unit 2 performs heating necessity determination. In other words, theoutdoor unit 2 repeatedly performs the heating necessity determination at every N minutes. - As described above, since power feeding to the
outdoor unit 2 can be turned off during the period of not performing the rotation-locked energization, the air-conditioning apparatus 100 according to the embodiment can improve the energy saving performance. -
Fig. 5 is a flowchart showing a process flow of heating control of the compressor on theoutdoor controller 20 side under operation stop of thecompressor 3 in the air-conditioning apparatus 100 related to the embodiment of the present invention, andFig. 6 is a flowchart showing a process flow of heating control of the compressor on theindoor controller 10 side under operation stop of thecompressor 3 in the air-conditioning apparatus 100 related to the embodiment of the present invention. - Next, description will be given of the process of heating control of the compressor under operation stop of the
compressor 3 in the air-conditioning apparatus 100 related to the embodiment by use ofFigs. 5 and6 . - As shown in
Fig. 5 , themeasurement unit 23 of theoutdoor controller 20 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 (step S101). Note that the outdoor air temperature obtained by themeasurement unit 23 is stored in the storage unit 24. Moreover, the process of obtaining a signal of outdoor air temperature by themeasurement unit 23 is performed every certain period of time, and the obtained outdoor air temperature is stored in the storage unit 24 each time. - After step S101, from the current outdoor air temperature obtained by the
measurement unit 23 and the past outdoor air temperature stored in the storage unit 24, the computation unit 25 calculates the outdoor air temperature after a certain period of time as the predicted outdoor air temperature by an approximate expression (step S102). - After step S102, the
determination unit 26 performs heating necessity determination to determine whether or not the predicted outdoor air temperature calculated by the computation unit 25 is higher than the current outdoor air temperature (step S103). - When the
determination unit 26 determines that the predicted outdoor air temperature is higher than the current outdoor air temperature, in other words, it is predicted that the outdoor air temperature tends to rise (Yes in step S103), theoutdoor measurement unit 28 starts time measurement (step S108), and thedrive unit 27 turns on the rotation-locked energization (step S109). - After step S109, when a certain period of time measured by the
outdoor measurement unit 28 has passed, in other words, a certain period of time in which the rotation-locked energization is ON has passed (Yes in step S110), the process returns to step S101 and themeasurement unit 23 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 again (step S101). - On the other hand, when the
determination unit 26 determines that the predicted outdoor air temperature is not higher than the current outdoor air temperature, in other words, when thedetermination unit 26 predicts that the outdoor air temperature does not tend to rise (No in step S103), the outdoor communication unit 21 transmits a power feeding OFF signal to theindoor communication unit 11 of the indoor controller 10 (step S104), and the powersupply management unit 22 turns off the power feeding to the outdoor unit 2 (step S105). At this time, when the rotation-locked energization is on, thedrive unit 27 turns off the rotation-locked energization. - As shown in
Fig. 6 , when theindoor communication unit 11 receives the power feeding OFF signal from the outdoor communication unit 21 (Yes in step S201), theindoor measurement unit 12 starts measurement of time (step S202). - After step S202, when a certain period of time measured by the
indoor measurement unit 12 has passed, in other words, when a certain period of time has passed since turning off the power feeding to the outdoor unit 2 (Yes in step S203), theindoor communication unit 11 transmits the power feeding ON signal to the outdoor communication unit 21 of the outdoor controller 20 (step S204), and the process returns to step S201. - As shown in
Fig. 5 , after step S105, when the outdoor communication unit 21 receives the power feeding ON signal from the indoor communication unit 11 (Yes in step S106), the powersupply management unit 22 turns on the power feeding to the outdoor unit 2 (step S107), the process returns to step S101, and themeasurement unit 23 obtains a signal of outdoor air temperature detected by the outdoor air temperature detector 8 again (step S101). - As described above, according to the air-
conditioning apparatus 100 of the embodiment, under operation stop of thecompressor 3, theoutdoor controller 20 obtains the current outdoor air temperature and calculates, from the current outdoor air temperature and the past outdoor air temperature stored in the storage unit 24, a predicted outdoor air temperature, which is an outdoor air temperature in future. Then, when it is determined that the predicted outdoor air temperature is higher than the current outdoor air temperature, in other words, when it is predicted that the outdoor air temperature tends to rise, theoutdoor controller 20 starts measurement of time and turns on the rotation-locked energization. On the other hand, when it is determined that the predicted outdoor air temperature is not higher than the current outdoor air temperature, in other words, when it is predicted that the outdoor air temperature does not tend to rise, theoutdoor controller 20 transmits the power feeding OFF signal to theindoor controller 10 to turn off the power feeding to theoutdoor unit 2. When the power feeding OFF signal is received from theoutdoor controller 20, theindoor controller 10 starts measurement of time, and when a certain period of measured time has passed, transmits the power feeding ON signal to theoutdoor controller 20. When the power feeding ON signal is received from theoutdoor controller 20, theoutdoor controller 20 turns on the power feeding to theoutdoor unit 2, and obtains the current outdoor air temperature again. - As described above, the
outdoor controller 20 turns off power feeding to theoutdoor unit 2 during a period in which thecompressor 3 is not heated, turns on the power feeding to theoutdoor unit 2 when the power feeding ON signal is received from theindoor controller 10 during the time when the power feeding to theoutdoor unit 2 is off, and determines heating necessity of thecompressor 3 and then turns off the power feeding to theoutdoor unit 2 when it is determined that heating of thecompressor 3 is unnecessary. Therefore, it is possible to turn off the power feeding to the outdoor unit until the power feeding ON signal is received from theindoor controller 10, and to improve the energy saving performance. - 1
indoor unit 2outdoor unit 3compressor 4 flow path switching valve 5indoor heat exchanger 6 expansion device 7 outdoor heat exchanger 8 outdoorair temperature detector 10indoor controller 11indoor communication unit 12indoor measurement unit 20 outdoor controller 21outdoor communication unit 22 powersupply management unit 23 measurement unit 24 storage unit 25computation unit 26determination unit 27drive unit 28outdoor measurement unit 100 air-conditioning apparatus
Claims (4)
- An air-conditioning apparatus (100) comprising:an outdoor unit (2) including a compressor (3) and an outdoor air temperature detector (8) configured to detect an outdoor air temperature;an outdoor controller (20); andan indoor controller (10) configured to transmit a signal to the outdoor controller (20),characterized in that the indoor controller (10) is configured to transmit a power feeding ON signal to the outdoor controller (20), the outdoor controller (20) including a storage unit (24) storing the outdoor air temperature detected by the outdoor air temperature detector (8) every certain period of time,the outdoor controller (20) being configured to,under operation stop of the compressor (3) and upon receiving the power feeding ON signal from the indoor controller (10), turn on power feeding to the outdoor unit (2), and perform heating necessity determination to determine whether or not heating of the compressor (3) is necessary in accordance with a current outdoor air temperature and an outdoor air temperature stored in the storage unit (24), andwhen determining that heating of the compressor (3) is necessary, perform a rotation-locked energization in order to energize the compressor (3) to electrically heat the compressor (3), and, when determining that heating of the compressor (3) is unnecessary, stop power feeding to the outdoor unit (2).
- The air-conditioning apparatus (100) of claim 1, wherein, the indoor controller (10) is configured to start measurement of time upon receiving a power feeding OFF signal transmitted by the outdoor controller (20) when the outdoor controller (20) turns off power feeding to the outdoor unit (2), and transmit the power feeding ON signal to the outdoor controller (20) after an elapse of a certain period of measured time.
- The air-conditioning apparatus (100) of claim 1 or 2, wherein
the outdoor controller (20) includes:a communication unit (21) configured to receive the power feeding ON signal from the indoor controller (10);a power supply management unit (22) configured to turn on power feeding to the outdoor unit (2) when the communication unit (21) receives the power feeding ON signal;a measurement unit (23) configured to obtain a signal of the outdoor air temperature detected by the outdoor air temperature detector (8);the storage unit (24) storing the outdoor air temperature obtained by the measurement unit (23);a computation unit (25) configured to compute, from the outdoor air temperature obtained by the measurement unit (23) and a past temperature stored in the storage unit (24), a predicted outdoor air temperature after an elapse of a certain period of time;a determination unit (26) configured to perform the heating necessity determination to determine whether or not the predicted outdoor air temperature is higher than the outdoor air temperature obtained by the measurement unit (23); anda drive unit (27) configured to turn on the rotation-locked energization when the determination unit (26) determines that the predicted outdoor air temperature is higher than the outdoor air temperature obtained by the measurement unit (23), whereinthe power supply management unit (22) is configured to turn off power feeding to the outdoor unit (2) when the determination unit (26) determines that the predicted outdoor air temperature is not higher than the outdoor air temperature obtained by the measurement unit (23). - The air-conditioning apparatus (100) of any one of claims 1 to 3, wherein the outdoor controller (20) is configured to start measurement of time when the rotation-locked energization is turned on and perform the heating necessity determination after an elapse of a certain period of measured time.
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PCT/JP2016/073870 WO2018033955A1 (en) | 2016-08-16 | 2016-08-16 | Air conditioning device |
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JP (1) | JP6576566B2 (en) |
CN (1) | CN109564044B (en) |
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CN108548281B (en) * | 2018-06-12 | 2020-06-26 | 海信(山东)空调有限公司 | Control method of air conditioner |
US20220214068A1 (en) * | 2019-06-24 | 2022-07-07 | Mitsubishi Electric Corporation | Air-conditioning device and air-conditioning system |
CN112984881B (en) * | 2021-03-05 | 2023-03-24 | 四川长虹空调有限公司 | Liquid return judgment method and system for compressor of refrigeration system |
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JP2000193325A (en) * | 1998-12-25 | 2000-07-14 | Matsushita Electric Ind Co Ltd | Air conditioner equipment |
JP2007163106A (en) * | 2005-12-16 | 2007-06-28 | Daikin Ind Ltd | Air conditioner |
JP4111246B2 (en) * | 2006-08-11 | 2008-07-02 | ダイキン工業株式会社 | Refrigeration equipment |
WO2008018381A1 (en) * | 2006-08-11 | 2008-02-14 | Daikin Industries, Ltd. | Refrigeration device |
JP2008286419A (en) * | 2007-05-15 | 2008-11-27 | Panasonic Corp | Air conditioning device |
JP2012241916A (en) * | 2011-05-16 | 2012-12-10 | Fujitsu General Ltd | Air conditioner |
JP2013204979A (en) | 2012-03-29 | 2013-10-07 | Fujitsu General Ltd | Air conditioner |
JP5774210B2 (en) * | 2012-04-27 | 2015-09-09 | 三菱電機株式会社 | Air conditioner |
JP6091226B2 (en) * | 2013-01-29 | 2017-03-08 | 三菱電機株式会社 | Refrigeration cycle equipment |
JP6177161B2 (en) * | 2014-02-26 | 2017-08-09 | 三菱電機株式会社 | Outdoor unit and air conditioner using the same |
CN105466095B (en) * | 2016-01-25 | 2018-04-20 | 珠海格力电器股份有限公司 | Low-temperature refrigeration air conditioner unit electric heating controlling method, device and system |
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WO2018033955A1 (en) | 2018-02-22 |
EP3321603A4 (en) | 2018-05-30 |
JP6576566B2 (en) | 2019-09-18 |
JPWO2018033955A1 (en) | 2018-11-22 |
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