CN104736948A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN104736948A
CN104736948A CN201280076442.3A CN201280076442A CN104736948A CN 104736948 A CN104736948 A CN 104736948A CN 201280076442 A CN201280076442 A CN 201280076442A CN 104736948 A CN104736948 A CN 104736948A
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CN
China
Prior art keywords
heat
running
indoor
outdoor
expansion valve
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.)
Granted
Application number
CN201280076442.3A
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Chinese (zh)
Other versions
CN104736948B (en
Inventor
本田雅裕
松本圭弘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Europe NV
Daikin Industries Ltd
Original Assignee
Daikin Europe NV
Daikin Industries Ltd
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Publication of CN104736948A publication Critical patent/CN104736948A/en
Application granted granted Critical
Publication of CN104736948B publication Critical patent/CN104736948B/en
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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
    • 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
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way 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
    • 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
    • F25B2400/24—Storage receiver heat
    • 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
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—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

Abstract

An air conditioner (1): is provided with a compressor (21), an outdoor heat exchanger (23), indoor heat exchangers (42a, 42b), and a refrigerant circuit (10) having a stored-heat heat exchanger (28) that exchanges heat between a refrigerant and a thermal storage material; and is capable of performing a heat storage operation, and simultaneously performing a stored-heat utilization operation and a heating operation during a defrosting operation. In the air conditioner (1), indoor units (4a, 4b) provided with indoor expansion valves (41a, 41b) have indoor-side control units (48a, 48b) that determine the positions of the indoor expansion valves (41a, 41b) when the heating operation alone is being performed. An outdoor unit (2) provided with an outdoor expansion valve (24) has an outdoor-side control unit (38) that determines the position of the outdoor expansion valve (24) when the heating operation alone is being performed, and determines the positions of the indoor expansion valves (41a, 41b) and the position of the outdoor expansion valve (24) when the heating operation is being performed for a defrosting operation accompanying the stored-heat utilization operation.

Description

Aircondition
Technical field
The present invention relates to a kind of aircondition, particularly relate to following this aircondition, this aircondition comprises refrigerant loop, this refrigerant loop has the heat-storage heat exchanger making to carry out heat exchange between cold-producing medium and heat-storing material, this aircondition carries out accumulation of heat running, and can accumulation of heat utilization running be carried out when defrosting running simultaneously and heat running, wherein above-mentioned accumulation of heat running refers to by making heat-storage heat exchanger play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material, above-mentioned accumulation of heat utilizes running to refer to by making heat-storage heat exchanger carry out the running of dispelling the heat as the evaporimeter performance function of cold-producing medium from heat-storing material.
Background technology
There is a kind of aircondition always, as shown in patent document 1 (Japanese Patent Laid-Open 2005 – No. 337657 publications), this aircondition comprises refrigerant loop, this refrigerant loop has compressor, outdoor heat converter, indoor heat converter and between cold-producing medium and heat-storing material, carries out the heat-storage heat exchanger of heat exchange, this aircondition carries out accumulation of heat running, and can carry out accumulation of heat utilization running when defrosting running simultaneously and heat running.At this, accumulation of heat running refers to by making heat-storage heat exchanger play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material.Defrosting running carries out the running of the defrosting of outdoor heat converter by making outdoor heat converter play function as the radiator of cold-producing medium.Accumulation of heat utilizes running to be by making heat-storage heat exchanger carry out the running of dispelling the heat from heat-storing material as the evaporimeter performance function of cold-producing medium.Heating running is make indoor heat converter as the running of the radiator performance function of cold-producing medium.
Summary of the invention
Above-mentioned existing aircondition has indoor unit and outdoor unit, wherein, above-mentioned indoor unit is provided with indoor heat converter and the indoor expansion valve for changing the flow of the cold-producing medium flowed in indoor heat converter, and above-mentioned outdoor unit is provided with outdoor heat converter and the outdoor expansion valve for changing the flow of the cold-producing medium flowed in outdoor heat converter.And, carry out common heat running time (, carry out without accumulation of heat utilize running and defrosting running heat running time), the aperture of degree of subcooling to indoor expansion valve based on the cold-producing medium in the exit of indoor heat converter controls (degree of subcooling of being undertaken by indoor expansion valve controls), guarantees the heating capacity of indoor heat converter thus.At this, determined the aperture of the indoor expansion valve in the control of this degree of subcooling by the indoor control part being arranged at indoor unit.
In this aircondition, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat simultaneously, when the defrosting ability of outdoor heat converter exists more than needed, with carry out common heat running time identical, as long as the aperture of being carried out indoor expansion valve by indoor control part controls, guarantee the heating capacity of indoor heat converter.
But, when the defrosting ability of outdoor heat converter does not exist more than needed, in order to the heating capacity of confinement cells inside heat exchanger, need to make the aperture of indoor expansion valve control from carry out common heat running time different.At this, when the aperture of indoor expansion valve is excessive relative to the aperture of outdoor expansion valve, insufficient to the restriction of the heating capacity of indoor heat converter, and the defrosting ability of outdoor heat converter is insufficient, terminates under therefore defrosting operates at the incomplete state of defrosting of outdoor heat converter.On the contrary, when the aperture of indoor expansion valve is too small relative to the aperture of outdoor expansion valve, although the defrosting ability of outdoor heat converter is abundant, but the heating capacity of indoor heat converter is excessively limited, therefore, this advantage utilizing the defrosting running with accumulation of heat utilization running to carry out heating running can no longer be obtained fully.
The technical problem that will solve of the present invention is, a kind of aircondition is provided, this aircondition comprises refrigerant loop, this refrigerant loop has the heat-storage heat exchanger carrying out heat exchange between cold-producing medium and heat-storing material, this aircondition carries out accumulation of heat running, and accumulation of heat can be carried out when defrosting running simultaneously utilize running and heat running, can suitably determine when utilizing the aperture of carrying out indoor expansion valve when heating running and outdoor expansion valve in the defrosting of running running with accumulation of heat simultaneously.
The aircondition of the first technical scheme comprises refrigerant loop, this refrigerant loop has compressor, outdoor heat converter, indoor heat converter and heat-storage heat exchanger, this heat-storage heat exchanger carries out heat exchange between cold-producing medium and heat-storing material, above-mentioned aircondition carries out accumulation of heat running, and can carry out accumulation of heat when defrosting running simultaneously and utilize running and heat the aircondition of running.At this, accumulation of heat running refers to by making heat-storage heat exchanger play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material.Defrosting running refers to by making outdoor heat converter play function as the radiator of cold-producing medium and carries out the running of the defrosting of outdoor heat converter.Accumulation of heat utilizes running to refer to by making heat-storage heat exchanger carry out the running of dispelling the heat as the evaporimeter performance function of cold-producing medium from heat-storing material.Heating running is instigate indoor heat converter as the running of the radiator performance function of cold-producing medium.In addition, refrigerant loop also has: indoor expansion valve, and this indoor expansion valve is used for changing the flow of the cold-producing medium flowed in indoor heat converter; And outdoor expansion valve, this outdoor expansion valve is used for changing the flow of the cold-producing medium flowed in outdoor heat converter.At this, indoor heat converter and indoor expansion valve are located at indoor unit, and outdoor heat converter and outdoor expansion valve are located at outdoor unit.And, in this aircondition, indoor unit has indoor control part, when only carrying out heating running, the aperture of indoor control part determination indoor expansion valve, outdoor unit has outside control part, when only carrying out heating running, the aperture of outside control part determination outdoor expansion valve, when carrying out heating running in the above-mentioned defrosting running utilizing running with accumulation of heat, the aperture of outside control part determination indoor expansion valve and the aperture of outdoor expansion valve.
At this, when only carrying out heating running, the aperture of indoor control part determination indoor expansion valve, and the aperture of outside control part determination outdoor expansion valve, but when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, outside control part not only determines the aperture of outdoor expansion valve, but also determines the aperture of indoor expansion valve.Therefore, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, outside control part can consider the balance of the defrosting ability of outdoor heat converter and the heating capacity of indoor heat converter, with the aperture of the aperture and indoor expansion valve of comprehensively determining outdoor expansion valve.
Thus, at this, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, the aperture of indoor expansion valve and outdoor expansion valve suitably can be determined.
The aircondition of the second technical scheme is on the basis of the aircondition of the first technical scheme, when when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, play till the first defrosting time from defrosting running, based on the dependency relation of the indoor temperature of the condensation temperature of the cold-producing medium in refrigerant loop and the air conditioning object space of indoor unit, determine the aperture of indoor expansion valve.
When carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, needing the heating capacity reliably guaranteeing indoor heat converter, and needing the aperture determining indoor expansion valve.But, when the aperture of outside control part determination indoor expansion valve, be difficult to consider the impact of the pressure loss of the cold-producing medium in the refrigerant pipe be connected with indoor unit by outdoor unit etc.
So, at this, as mentioned above, playing till the first defrosting time from defrosting running, based on the dependency relation of the indoor temperature of the condensation temperature of the cold-producing medium in refrigerant loop and the air conditioning object space of indoor unit, determine the aperture of indoor expansion valve.Such as when condensation temperature is lower than the threshold temperature obtained according to indoor temperature, outdoor control part is judged to be the heating capacity not guaranteeing indoor heat converter, thus increases the aperture of indoor expansion valve and guarantee the heating capacity of indoor heat converter.And, at this, as mentioned above, playing from defrosting running in the scope till the first defrosting time, the aperture of carrying out this indoor expansion valve is determined, at the initial stage of defrosting running, preferentially guarantee the heating capacity of indoor heat converter, and carry out defrosting running.
Thus, at this, outdoor control part, by suitably determining the aperture of indoor expansion valve based on the dependency relation of condensation temperature and indoor temperature, preferentially can guarantee the heating capacity of indoor heat converter, and can carry out defrosting running.
The aircondition of the 3rd technical scheme is on the basis of the aircondition of the second technical scheme, after have passed through the first defrosting time starting from defrosting running, to reduce the heating capacity of indoor heat converter, and the mode increasing the defrosting ability of outdoor heat converter changes the aperture of indoor expansion valve and outdoor expansion valve.
When carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, in order to reliably terminate the defrosting of outdoor heat converter, need the defrosting ability increasing outdoor heat converter.
So, at this, as mentioned above, after have passed through the first defrosting time starting from defrosting running, to reduce the heating capacity of indoor heat converter and the mode increasing the defrosting ability of outdoor heat converter changes the aperture of indoor expansion valve and outdoor expansion valve.Such as after have passed through the first defrosting time starting from defrosting running, outdoor control part reduces the aperture of indoor expansion valve, and increase the aperture of outdoor expansion valve, to reduce the heating capacity of indoor heat converter, and increase the defrosting ability of outdoor heat converter, thus transfer to the running preferentially carrying out defrosting from the running preferentially carrying out heating.
Thus, at this, outdoor control part, by suitably determining the aperture of indoor expansion valve and outdoor expansion valve, can transfer to the running preferentially carrying out defrosting, reliably to terminate the defrosting of outdoor heat converter from the running preferentially carrying out heating.
The aircondition of the 4th technical scheme is on the basis of the aircondition of the 3rd technical scheme, and the outdoor temperature based on the space outerpace for outdoor unit configuration determines the first defrosting time.
Form the equipment of refrigerant loop and have an impact to the time needed for defrosting from the scattering losses of heat-storing material, the required time of therefore defrosting is in the lower and longer tendency of outdoor temperature.Therefore, it is desirable that also based on outdoor temperature, determine the time, i.e. the first defrosting time that carry out making to heat preferential running.
So, at this, as mentioned above, the first defrosting time is determined based on outdoor temperature.Such as outdoor temperature is lower, then more need to shorten to make the time heating preferential running, extend the time of the running making defrosting preferential, be therefore defined as: outdoor temperature is lower, then the first defrosting time is shorter.
Thus, at this, by determining the first defrosting time carrying out making to heat preferential running based on outdoor temperature, the running carrying out making defrosting preferential can be extended, reliably to terminate the defrosting of outdoor heat converter.
On the basis of aircondition aircondition of arbitrary technical scheme in the second technical scheme to the 4th technical scheme of the 5th technical scheme, in defrosting running, based on the degree of superheat of the cold-producing medium of discharging from compressor, judge whether the aperture of indoor expansion valve becomes excessive.
When carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, when the aperture of indoor expansion valve becomes excessive, the cold-producing medium in the exit of indoor heat converter easily becomes gas-liquid two-phase state.So, in the refrigerant pipe that the outlet side (hydraulic fluid side) of indoor heat converter is connected with the entrance side (hydraulic fluid side) of the heat-storage heat exchanger of the evaporimeter performance function as cold-producing medium, the cold-producing medium of easy gassy state.At this, in refrigerant loop, when the part be connected with the entrance side (hydraulic fluid side) of heat-storage heat exchanger playing function as the evaporimeter of cold-producing medium by the outlet side (hydraulic fluid side) of indoor heat converter not being provided with receiver, liquid refrigerant may being there is and get back to so-called liquid backflow in compressor via heat-storage heat exchanger.Further, when liquid backflow occurs, there is the tendency reduced in the degree of superheat of the cold-producing medium of discharging from compressor.
So, at this, outdoor control part, based on the degree of superheat of the cold-producing medium of discharging from compressor, judges because the aperture of indoor expansion valve becomes excessive and liquid backflow is occurred.Such as when the degree of superheat of the cold-producing medium of discharging from compressor is less than the threshold degree of superheat, outdoor control part judges to there occurs liquid backflow.Further, the aperture of indoor expansion valve is reduced as required.
Thus, at this, utilizing in the defrosting running of running with accumulation of heat, can suitably judge whether the aperture of indoor expansion valve becomes excessive, while carry out heating running.
Accompanying drawing explanation
Fig. 1 is the summary construction diagram of the aircondition of one embodiment of the present invention.
Fig. 2 is the summary construction diagram of heat-storage heat exchanger.
Fig. 3 is the control block diagram of aircondition.
Fig. 4 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in cooling operation.
Fig. 5 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop that heats in running.
Fig. 6 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in accumulation of heat running (heating accumulation of heat running during running).
Fig. 7 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in defrosting running (utilizing the defrosting running of running with accumulation of heat).
Fig. 8 is the flow chart that indoor expansion valve in defrosting running (utilizing the defrosting of running running with accumulation of heat) and the aperture of outdoor expansion valve are determined.
Fig. 9 be represent defrosting running (with accumulation of heat utilize running defrosting running) in indoor expansion valve and outdoor expansion valve aperture timeliness change figure.
Figure 10 is the flow chart that indoor expansion valve in the defrosting running (utilizing the defrosting of running running with accumulation of heat) of variation 2 and the aperture of outdoor expansion valve are determined.
Detailed description of the invention
Below, be described based on the embodiment of accompanying drawing to aircondition of the present invention.In addition, the concrete structure of the embodiment of aircondition of the present invention is not limited to following embodiment and variation thereof, can change in the scope of purport not departing from invention.
(1) basic structure of aircondition
Fig. 1 is the summary construction diagram of the aircondition 1 of one embodiment of the present invention.Aircondition 1 is kind of refrigeration cycle running by carrying out steam compression type and the device carrying out air conditioning within doors that is used to building etc.Mainly through outdoor unit 2 is connected with multiple stage (in this case two) indoor unit 4a, 4b and forms aircondition 1.At this, outdoor unit 2 and multiple stage indoor unit 4a, 4b linked together via liquid refrigerant communicating pipe 6 and gas refrigerant communicating pipe 7.That is, by making outdoor unit 2 and multiple stage indoor unit 4a, 4b link together via cold-producing medium communicating pipe 6,7, the refrigerant loop 10 of the steam compression type of aircondition 1 is formed.
< indoor unit >
Indoor unit 4a, 4b are disposed in the interior.Indoor unit 4a, 4b were connected with outdoor unit 2 via cold-producing medium communicating pipe 6,7, and formed a part for refrigerant loop 10.
Next, the structure of indoor unit 4a, 4b is described.In addition, indoor unit 4b has the structure same with indoor unit 4a, therefore the structure of indoor unit 4a is described, about the structure of indoor unit 4b at this, mark the footmark a that footmark b replaces each several part representing indoor unit 4a respectively, omit the explanation to each several part.
Indoor unit 4a mainly has the indoor refrigerant loop 10a (being indoor refrigerant loop 10b in indoor unit 4b) of the part forming refrigerant loop 10.Indoor refrigerant loop 10a mainly has indoor expansion valve 41a and indoor heat converter 42a.
Indoor expansion valve 41a is the cold-producing medium decompression thus the valve changed the flow of the cold-producing medium flowed in indoor heat converter 42a that make to flow in the refrigerant loop 10a of indoor.Indoor expansion valve 41a is the electric expansion valve be connected with the hydraulic fluid side of indoor heat converter 42a.
Indoor heat converter 42a is such as made up of the fin tube type heat exchanger of cross-fin formula.The indoor fan 43a for being transported to by room air in indoor heat converter 42a is provided with near indoor heat converter 42a.By carrying room air with indoor fan 43a to indoor heat converter 42a, make to carry out heat exchange between cold-producing medium and room air in indoor heat converter 42a.Indoor fan motor 44a drive chamber internal fan 43a is utilized to rotate.Thus, indoor heat converter 42a plays function as the radiator of cold-producing medium and the evaporimeter of cold-producing medium.
In addition, in indoor unit 4a, various sensors is provided with.The hydraulic fluid side temperature sensor 45a that the temperature Trla of the cold-producing medium of liquid condition or gas-liquid two-phase state is detected is provided with in the hydraulic fluid side of indoor heat converter 42a.The gas side temperature sensor 46a that the temperature Trga of the cold-producing medium of gaseous state is detected is provided with at the gas side of indoor heat converter 42a.The suction inlet side of the room air of indoor unit 4a is provided with indoor temperature transmitter 47a, and the temperature (that is, indoor temperature Tra) of this indoor temperature transmitter 47a to the room air of the air conditioning object space of indoor unit 4a detects.In addition, indoor unit 4a has the indoor control part 48a controlled the action of each several part forming indoor unit 4a.And, indoor control part 48a has the microcomputer and memory etc. that arrange to control indoor unit 4a, can and for operate indoor unit 4a individually remote controllers 49a between carry out the exchange of control signal etc., and can and outdoor unit 2 between carry out the exchange of control signal etc.In addition, remote controllers 49a is that user carries out the various setting relevant to operation of air conditioner and the equipment of running/halt instruction.
< outdoor unit >
Outdoor unit 2 is arranged without.Outdoor unit 2 was connected with indoor unit 4a, 4b via cold-producing medium communicating pipe 6,7, and formed a part for refrigerant loop 10.
Next, the structure of outdoor unit 2 is described.
Outdoor unit 2 mainly has the outside refrigerant loop 10c of the part forming refrigerant loop 10.This outside refrigerant loop 10c mainly has compressor 21, first switching mechanism 22, outdoor heat converter 23, outdoor expansion valve 24, second switching mechanism 27, heat-storage heat exchanger 28 and accumulation of heat expansion valve 29.
Compressor 21 is the hermetic type compressors of the air compressor motor 20 containing not shown compressing member and drive compressing member to rotate in housing.Supply electric power by not shown DC-to-AC converter to air compressor motor 20, air compressor motor 20 changes by making the frequency (that is, rotating speed) of DC-to-AC converter, can change running capacity.
First switching mechanism 22 is four-way switching valves of the flow direction for switching cold-producing medium.When the radiator making outdoor heat converter 23 as cold-producing medium plays function, first switching mechanism 22 carries out the discharge side of compressor 21 to be connected with the gas side of outdoor heat converter 23 and the switching be connected with the suction side of compressor 21 by the gas side of heat-storage heat exchanger 28 (outdoor heat radiation switching state, the solid line with reference to first switching mechanism 22 of Fig. 1).At this, when making the first switching mechanism 22 switch to outdoor heat radiation switching state, heat-storage heat exchanger 28 can be made to play function as the evaporimeter of cold-producing medium.In addition, when the evaporimeter making outdoor heat converter 23 as cold-producing medium plays function, first switching mechanism 22 carries out the suction side of compressor 21 to be connected with the gas side of outdoor heat converter 23 and the switching be connected with the discharge side of compressor 21 by the gas side of heat-storage heat exchanger 28 (outdoor evaporation switching state, the dotted line with reference to first switching mechanism 22 of Fig. 1).At this, when making the second switching mechanism 22 switch to outdoor evaporation switching state, heat-storage heat exchanger 28 can be made to play function as the radiator of cold-producing medium.In addition, the first switching mechanism 22 may not be four-way switching valve, but is configured to the combination such as triple valve and magnetic valve with the component playing identical function.
Outdoor heat converter 23 is such as made up of the fin tube type heat exchanger of cross-fin formula.The outdoor fan 25 for being transported to by outdoor air in outdoor heat converter 23 is provided with near outdoor heat converter 23.By by outdoor fan 25 pairs of outdoor heat converter 23 conveying chamber outer air, make to carry out heat exchange between cold-producing medium and outdoor air in outdoor heat converter 23.Outdoor fan motor 26 drive chamber external fan 25 is utilized to rotate.Thus, outdoor heat converter 23 plays function as the radiator of cold-producing medium and the evaporimeter of cold-producing medium.
Outdoor expansion valve 24 is that the cold-producing medium of the flowing in outdoor heat converter 23 made in the refrigerant loop 10c of outside reduces pressure thus the valve changed the flow of the cold-producing medium of flowing in outdoor heat converter 23.Outdoor expansion valve 24 is the electric expansion valves be connected with the hydraulic fluid side of outdoor heat converter 23.
Second switching mechanism 27 is four-way switching valves of the flow direction for switching cold-producing medium.When the evaporimeter making indoor heat converter 42a, 42b as cold-producing medium plays function, second switching mechanism 27 carries out the switching (indoor evaporation switching state, the solid line with reference to second switching mechanism 27 of Fig. 1) be connected with gas refrigerant communicating pipe 7 suction side of compressor 21.In addition, when the radiator making indoor heat converter 42a, 42b as cold-producing medium plays function, second switching mechanism 27 carries out the switching (indoor radiating switching state, the dotted line with reference to second switching mechanism 27 of Fig. 1) discharge side of compressor 21 be connected with gas refrigerant communicating pipe 7.At this, one (Fig. 1 leans on the port on the right side of paper) in four ports of the second switching mechanism 27 connects with the port be connected with the suction side of compressor 21 all the time via capillary 271 (Fig. 1 leans on the port on the upside of paper), thus in fact becomes not by the port used.In addition, the second switching mechanism 27 may not be four-way switching valve, but is configured to the combination such as triple valve and magnetic valve with the component playing identical function.
Heat-storage heat exchanger 28 is the heat exchangers making to carry out between cold-producing medium and heat-storing material heat exchange, in the accumulation of heat undertaken to heat-storing material by playing function as the radiator of cold-producing medium, and when carrying out dispelling the heat (accumulation of heat utilization) from heat-storing material by playing function as the evaporimeter of cold-producing medium, use this heat-storage heat exchanger 28.Heat-storage heat exchanger 28 mainly has the heat storage tank 281 containing heat-storing material and the heat transfer tube group 282 being configured to impregnated in heat-storing material.At this, as shown in Figure 2, heat storage tank 281 is casings of roughly rectangular shape, has heat-storing material in inner product.As heat-storing material, use at this material being carried out accumulation of heat by phase transformation.Specifically, use polyethylene glycol, sodium sulphate hydrate and the paraffin etc. with the phase change temperature of 30 DEG C ~ about 40 DEG C, to carry out phase transformation (melting) and accumulation of heat when heat-storage heat exchanger 28 is used as the radiator of cold-producing medium, and carry out phase transformation (solidifying) when heat-storage heat exchanger 28 is used as the evaporimeter of cold-producing medium and utilize accumulation of heat.As shown in Figure 2, the structure that is connected while there is the collector 283 at the gateway place by being arranged on cold-producing medium and current divider 284 and multiple heat-transfer pipe 285 branch of heat transfer tube group 282.At this, multiple heat-transfer pipe 285 has the shape of turning back along the vertical direction respectively, to be connected to form heat pipe group 282 by making the two ends of above-mentioned multiple heat-transfer pipe 285 with collector 283 and current divider 284.And, the gas side of heat-storage heat exchanger 28 (namely, one end of heat transfer tube group 282) be connected with the first switching mechanism 22, the hydraulic fluid side (that is, the other end of heat transfer tube group 282) of heat-storage heat exchanger 28 is connected with the part between liquid refrigerant communicating pipe 6 via the outdoor expansion valve 24 of accumulation of heat expansion valve 29 and refrigerant loop 10 (be outside refrigerant loop 10c at this).At this, Fig. 2 is the summary construction diagram of heat-storage heat exchanger 28.
Accumulation of heat expansion valve 29 is that the cold-producing medium of the flowing in heat-storage heat exchanger 28 made in the refrigerant loop 10c of outside reduces pressure thus the valve changed the flow of the cold-producing medium of flowing in heat-storage heat exchanger 28.Accumulation of heat expansion valve 29 is the electric expansion valves be connected with the hydraulic fluid side of heat-storage heat exchanger 28.
In addition, in outdoor unit 2, various sensors is provided with.The suction pressure sensor 31 that the suction pressure Ps of compressor 21 is detected, the discharge pressure sensor 32 that the discharge pressure Pd of compressor 21 is detected, the inlet temperature sensor 33 that the inlet temperature Ts of compressor 21 is detected and the discharge temperature sensor 34 that the discharge temperature Td of compressor 21 is detected is provided with in outdoor unit 2.The outdoor heat exchange temperature sensor 35 that the temperature Tol1 of the cold-producing medium of gas-liquid two-phase state is detected is provided with at outdoor heat converter 23.The hydraulic fluid side temperature sensor 36 that the temperature Tol2 of the cold-producing medium of liquid condition or gas-liquid two-phase state is detected is provided with in the hydraulic fluid side of outdoor heat converter 23.The suction inlet side of the outdoor air of outdoor unit 2 is provided with outdoor temperature sensor 37, this outdoor temperature sensor 37 is to supplying outdoor unit 2 (namely, outdoor heat converter 23 and heat-storage heat exchanger 28) temperature (that is, outdoor temperature Ta) of the outdoor air of space outerpace that configures detects.In addition, outdoor unit 2 has the outside control part 38 controlled the action of each several part forming outdoor unit 2.And, outside control part 38 has the DC-to-AC converter etc. controlled the microcomputer, memory and the air compressor motor 25 that arrange to control outdoor unit 2, the exchange carrying out control signal etc. between indoor control part 48a, 48b of energy and indoor unit 4a, 4b.
< cold-producing medium communicating pipe >
Cold-producing medium communicating pipe 6,7 is when arranging aircondition 1 at the scene by the refrigerant pipe of constructing, and the setting model according to outdoor unit 2 and indoor unit 4a, 4b uses the cold-producing medium communicating pipe with various length and caliber.
< control part >
As shown in Figure 1, for operating separately remote controllers 49a, the 49b of indoor unit 4a, 4b, the outside control part 38 of indoor control part 48a, 48b of indoor unit 4a, 4b and outdoor unit 2 forms and carries out to aircondition 1 entirety the control part 8 controlled that operates.As shown in Figure 3, control part 8 so that various sensor 31 ~ 37 can be received, the mode of detection signal of 45a, 45b, 46a, 46b, 47a, 47b etc. is connected with various sensor 31 ~ 37,45a, 45b, 46a, 46b, 47a, 47b.Further, control part 8 be configured to by detection signal based on above-mentioned various sensor etc. to various equipment and valve 20,22,24,26,41a, 41b, 44a, 44b control, and can carry out operation of air conditioner (cooling operation and heat running).At this, Fig. 3 is the control block diagram of aircondition 1.
As mentioned above, aircondition 1 has the refrigerant loop 10 by making multiple stage (in this case two) indoor unit 4a, 4b be connected with outdoor unit 2 and form.Further, in aircondition 1, utilize control part 8 to carry out following running like this and control.
(2) elemental motion of aircondition
Next, use Fig. 4 to Fig. 7 to the cooling operation of aircondition 1, heat the elemental motion that running, accumulation of heat running and defrosting operate and be described.At this, Fig. 4 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in cooling operation.Fig. 5 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop that heats in running.Fig. 6 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in accumulation of heat running (heating accumulation of heat running during running).Fig. 7 is the figure of the flowing of the cold-producing medium represented in the refrigerant loop in defrosting running (utilizing the defrosting running of running with accumulation of heat).
< cooling operation >
When sending the instruction of cooling operation from remote controllers 49a, 49b, the first switching mechanism 22 is made to switch to outdoor heat radiation switching state (state indicated by the solid line of first switching mechanism 22 of Fig. 4), and make the second switching mechanism 27 switch to indoor evaporation switching state (state indicated by the solid line of second switching mechanism 27 of Fig. 4), and make accumulation of heat expansion valve 29 be in closed state (namely, do not use the state of heat-storage heat exchanger 28), compressor 21, outdoor fan 25 and indoor fan 43a, 43b are started.
Like this, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled into the gas refrigerant becoming high pressure in compressor 21 and by compressing.The gas refrigerant of this high pressure is transported in outdoor heat converter 23 via the first switching mechanism 22.The gas refrigerant being transported to the high pressure in outdoor heat converter 23 plays in the outdoor heat converter 23 of function at the radiator as cold-producing medium, carry out heat exchange with the outdoor air supplied by outdoor fan 25 and be cooled, thus condensation, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure via outdoor expansion valve 24 and liquid refrigerant communicating pipe 6 outdoor unit 2 be transported in indoor unit 4a, 4b.
The liquid refrigerant being transported to the high pressure in indoor unit 4a, 4b is reduced pressure by indoor expansion valve 41a, 41b and becomes the cold-producing medium of the gas-liquid two-phase state of low pressure.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in indoor heat converter 42a, 42b.The cold-producing medium being transported to the gas-liquid two-phase state of the low pressure in indoor heat converter 42a, 42b plays in indoor heat converter 42a, 42b of function at the evaporimeter as cold-producing medium, carry out heat exchange with the room air supplied by indoor fan 43a, 43b and heated, thus evaporation, become the gas refrigerant of low pressure.The gas refrigerant of this low pressure via gas refrigerant communicating pipe 7 indoor unit 4a, 4b be transported in outdoor unit 2.
The gas refrigerant being transported to the low pressure in outdoor unit 2 is sucked by compressor 21 again via the second switching mechanism 27.
< heats running >
When sending from remote controllers 49a, 49b the instruction heating running, the first switching mechanism 22 is made to switch to outdoor evaporation switching state (state represented by dashed line of first switching mechanism 22 of Fig. 5), and make the second switching mechanism 27 switch to indoor radiating switching state (state represented by dashed line of second switching mechanism 27 of Fig. 5), and make accumulation of heat expansion valve 29 be in closed state (namely, do not use the state of heat-storage heat exchanger 28), compressor 21, outdoor fan 25 and indoor fan 43a, 43b are started.
Like this, the gas refrigerant of the low pressure in refrigerant loop 10 to be inhaled in compressor 21 and to be become the gas refrigerant of high pressure by compressing.The gas refrigerant of this high pressure via the second switching mechanism 27 and gas refrigerant communicating pipe 7 outdoor unit 2 be transported in indoor unit 4a, 4b.
The gas refrigerant being transported to the high pressure in indoor unit 4a, 4b is transported in indoor heat converter 42a, 42b.The gas refrigerant being transported to the high pressure in indoor heat converter 42a, 42b plays in indoor heat converter 42a, 42b of function at the radiator as cold-producing medium, carry out heat exchange with the room air supplied by indoor fan 43a, 43b and be cooled, thus condensation, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.The cold-producing medium reduced pressure by indoor expansion valve 41a, 41b via gas refrigerant communicating pipe 7 indoor unit 4a, 4b be transported in outdoor unit 2.
The cold-producing medium be transported in outdoor unit 2 is transported in outdoor expansion valve 24, is reduced pressure and become the cold-producing medium of the gas-liquid two-phase state of low pressure by outdoor expansion valve 24.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in outdoor heat converter 23.The cold-producing medium being transported to the gas-liquid two-phase state of the low pressure in outdoor heat converter 23 plays in the outdoor heat converter 23 of function at the evaporimeter as cold-producing medium, carry out heat exchange with the outdoor air supplied by outdoor fan 25 and heated, thus evaporation, become the gas refrigerant of low pressure.The gas refrigerant of this low pressure is sucked by compressor 21 again via the first switching mechanism 22.
< accumulation of heat running (heating accumulation of heat running during running) >
When heating running, carry out accumulation of heat running, this accumulation of heat running refers to by making heat-storage heat exchanger 28 play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material.Namely, carrying out making outdoor heat converter 23 play function as the evaporimeter of cold-producing medium, and make indoor heat converter 42a, 42b as cold-producing medium radiator play function heat running time, carry out accumulation of heat running (accumulation of heat running when heating running), this accumulation of heat running refers to by making heat-storage heat exchanger 28 play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material.By opening accumulation of heat expansion valve 29 with on the basis heating the identical switching state that operates making switching mechanism 22,27 switch to, carry out the accumulation of heat running (with reference to Fig. 6) when this heats running.
Like this, the gas refrigerant of the low pressure in refrigerant loop 10 to be inhaled in compressor 21 and to be become the gas refrigerant of high pressure by compressing.Identical with when heating running, the part of the gas refrigerant of this high pressure via the second switching mechanism 27 and gas refrigerant communicating pipe 7 outdoor unit 2 be transported in indoor unit 4a, 4b.This gas refrigerant being transported to the high pressure in indoor unit 4a, 4b plays in indoor heat converter 42a, 42b of function at the radiator as cold-producing medium, carry out heat exchange with the room air supplied by indoor fan 43a, 43b and be cooled, thus condensation, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.The cold-producing medium reduced pressure by indoor expansion valve 41a, 41b via gas refrigerant communicating pipe 7 indoor unit 4a, 4b be transported in outdoor unit 2.
In addition, be transported in heat-storage heat exchanger 28 from the remainder of the gas refrigerant of the high pressure of compressor 21 discharge via the first switching mechanism 22.The gas refrigerant being transported to the high pressure in heat-storage heat exchanger 28 plays in the heat-storage heat exchanger 28 of function at the radiator as cold-producing medium, carries out heat exchange and be cooled with heat-storing material, thus condensation, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is reduced pressure by accumulation of heat expansion valve 29.At this, the heat-storing material of heat-storage heat exchanger 28 is heated by the heat exchange with cold-producing medium, thus undergoes phase transition (melting), carries out accumulation of heat.
The cold-producing medium reduced pressure by accumulation of heat expansion valve 29 and indoor unit 4a, 4b cold-producing medium be transported in outdoor unit 2 collaborate and are transported in outdoor expansion valve 24, and are reduced pressure by outdoor expansion valve 24 and become the cold-producing medium of the gas-liquid two-phase state of low pressure.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in outdoor heat converter 23.The cold-producing medium being transported to the gas-liquid two-phase state of the low pressure in outdoor heat converter 23 plays in the outdoor heat converter 23 of function at the evaporimeter as cold-producing medium, carry out heat exchange with the outdoor air supplied by outdoor fan 25 and heated, thus evaporation, become the gas refrigerant of low pressure.The gas refrigerant of this low pressure is sucked by compressor 21 again via the first switching mechanism 22.Like this, in the accumulation of heat running when heating running, heat-storage heat exchanger 28 plays function as the radiator of the cold-producing medium in parallel with indoor heat converter 42a, 42b.That is, refrigerant loop 10 is configured to, in the accumulation of heat running when heating running, the gas refrigerant of the high pressure of discharging from compressor 21 to be transported in indoor heat converter 42a, 42b and heat-storage heat exchanger 28 in parallel.
< defrosting running (utilizing the defrosting running of running with accumulation of heat) >
When heating running, carry out by make outdoor heat converter 23 as cold-producing medium radiator play function and carry out the defrosting of outdoor heat converter defrosting running.Further, when defrosting operates, carry out accumulation of heat and utilize running, this accumulation of heat utilizes to operate and refers to by making heat-storage heat exchanger 28 carry out the running of dispelling the heat as the evaporimeter performance function of cold-producing medium from heat-storing material.Namely, carry out making outdoor heat converter 23 play function as the radiator of cold-producing medium, and heat-storage heat exchanger 28 is utilized operate (accumulation of heat utilization running during defrosting running and the defrosting running with accumulation of heat utilization running) as the accumulation of heat of the evaporimeter performance function of cold-producing medium.And, at this, by making indoor heat converter 42a, 42b play function as the radiator of cold-producing medium, also carry out heating running simultaneously.That is, at this, when defrosting running, carrying out accumulation of heat simultaneously and utilizing running and heat running (or simultaneously carrying out heating running in the defrosting running with accumulation of heat utilization running).First switching mechanism 22 is being switched to outdoor heat radiation switching state, and the second switching mechanism 27 is switched on the basis of indoor radiating switching state, open accumulation of heat expansion valve 29, thus accumulation of heat when carrying out this defrosting running utilizes running (or utilizing the defrosting running of running with accumulation of heat) (with reference to Fig. 7).In addition, when defrosting running, outdoor fan 25 is stopped.
Like this, the gas refrigerant of the low pressure in refrigerant loop 10 is inhaled into the interior also compression of compressor 21 and becomes the gas refrigerant of high pressure.Identical with when heating running, the part of the gas refrigerant of this high pressure via the second switching mechanism 27 and gas refrigerant communicating pipe 7 outdoor unit 2 be transported in indoor unit 4a, 4b.This gas refrigerant being transported to the high pressure in indoor unit 4a, 4b plays in indoor heat converter 42a, 42b of function at the radiator as cold-producing medium, carry out heat exchange with the room air supplied by indoor fan 43a, 43b and be cooled, thus condensation, become the liquid refrigerant of high pressure.The liquid refrigerant of this high pressure is reduced pressure by indoor expansion valve 41a, 41b.The cold-producing medium reduced pressure by indoor expansion valve 41a, 41b via gas refrigerant communicating pipe 7 indoor unit 4a, 4b be transported in outdoor unit 2.
In addition, be transported in outdoor heat converter 23 from the remainder of the gas refrigerant of the high pressure of compressor 21 discharge via the first switching mechanism 22.The gas refrigerant being transported to the high pressure in outdoor heat converter 23 plays in the outdoor heat converter 23 of function at the radiator as cold-producing medium, carries out heat exchange with the frost and ice being attached to outdoor heat converter 23 and is cooled.The cold-producing medium of this high pressure is reduced pressure by outdoor expansion valve 24.At this, the frost and the ice that are attached to outdoor heat converter 23 are heated by the heat exchange with cold-producing medium, thus melt, and defrost to outdoor heat converter 23.
The cold-producing medium of the high pressure reduced pressure by outdoor expansion valve 24 and unit 4a, 4b cold-producing medium be transported in outdoor unit 2 indoor collaborate and are transported in accumulation of heat expansion valve 29, reduced pressure and become the cold-producing medium of the gas-liquid two-phase state of low pressure by accumulation of heat expansion valve 29.The cold-producing medium of the gas-liquid two-phase state of this low pressure is transported in heat-storage heat exchanger 28.The cold-producing medium being transported to the gas-liquid two-phase state of the low pressure in heat-storage heat exchanger 28 plays in the heat-storage heat exchanger 28 of function at the evaporimeter as cold-producing medium, carries out heat exchange and heated with heat-storing material, thus evaporation, become the gas refrigerant of low pressure.The gas refrigerant of this low pressure is sucked by compressor 21 again via the first switching mechanism 22.At this, the heat-storing material of heat-storage heat exchanger 28 is cooled by the heat exchange with cold-producing medium, thus undergoes phase transition (solidifying) and utilize accumulation of heat.Like this, when carrying out heating running in operate in the defrosting with accumulation of heat utilization running (or accumulation of heat utilization running during defrosting running), indoor heat converter 42a, 42b play function as the radiator of the cold-producing medium in parallel with outdoor heat converter 23 simultaneously.Namely, refrigerant loop 10 is configured to: when carrying out heating running in operate in the defrosting with accumulation of heat utilization running (or accumulation of heat utilization running during defrosting running), the gas refrigerant of the high pressure of discharging from compressor 21 can be transported in outdoor heat converter 23 and indoor heat converter 42a, 42b by refrigerant loop 10 in parallel simultaneously.
< cooling operation, heat running and accumulation of heat running control >
-during cooling operation-
In above-mentioned cooling operation, degree of superheat SHra, SHrb in order to the cold-producing medium making the exit of each indoor heat converter 42a, 42b reach target superheat degree SHras, SHrbs, and control part 8 is determined the aperture of each indoor expansion valve 41a, 41b and carried out controlling (this control being called " degree of superheat of being undertaken by indoor expansion valve controls " below).At this, according to the suction pressure Ps detected by suction pressure sensor 31 and temperature Trga, the Trgb of the cold-producing medium of the gas side of indoor heat converter 42a that are detected by gas side temperature sensor 46a, 46b, calculate degree of superheat SHra, SHrb.More specifically, first, suction pressure Ps is converted into the saturation temperature of cold-producing medium, obtain with refrigerant loop 10 in evaporating pressure Pe equivalence quantity of state, i.e. evaporating temperature Te (namely, although evaporating pressure Pe and evaporating temperature Te term itself are different, actually refer to identical quantity of state).At this, the pressure that evaporating pressure Pe refers to when cooling operation, the outlet represented at expansion valve 41a, 41b indoor arrives the cold-producing medium of the low pressure of the ranged flow till the suction side of compressor 21 via indoor heat converter 42a, 42b.Further, by deducting evaporating temperature Te in temperature Trga, the Trgb of the cold-producing medium of the gas side from each indoor heat converter 42a, 42b, degree of superheat SHra, SHrb is obtained.
In addition, in cooling operation, indoor control part 48a, 48b each equipment to indoor unit 4a, 4b of comprising indoor expansion valve 41a, 41b of control part 8 is utilized to control.In addition, each equipment of the outside control part 38 of control part 8 to the outdoor unit 2 comprising outdoor expansion valve 24 is utilized to control.
-when heating running-
Heat in running above-mentioned, in order to degree of subcooling SCra, the SCrb of the cold-producing medium making the exit of each indoor heat converter 42a, 42b reach target degree of subcooling SCras, SCrbs, control part 8 is determined the aperture of each indoor expansion valve 41a, 41b and is carried out controlling (this control being called " degree of subcooling of being undertaken by indoor expansion valve controls " below).At this, according to the discharge pressure Pd detected by discharge pressure sensor 32 and temperature Trla, the Trlb of the cold-producing medium of the hydraulic fluid side of indoor heat converter 42a that are detected by hydraulic fluid side temperature sensor 45a, 45b, calculate degree of subcooling SCra, SCrb.More specifically, first, discharge pressure Pd is converted into the saturation temperature of cold-producing medium, obtain with refrigerant loop 10 in condensing pressure Pc equivalence quantity of state, i.e. condensation temperature Tc (namely, although condensing pressure Pc and condensation temperature Tc term itself are different, actually refer to identical quantity of state).At this, condensing pressure Pc referring to when heating running, representing the pressure of the cold-producing medium of the high pressure arriving the ranged flow till indoor expansion valve 41a, 41b in the discharge side from compressor 21 via indoor heat converter 42a, 42b.Further, by deducting temperature Trla, the Trlb of the cold-producing medium of the hydraulic fluid side of each indoor heat converter 42a, 42b from condensation temperature Tc, degree of subcooling SCra, SCrb is obtained.
In addition, heating in running, utilizing indoor control part 48a, 48b each equipment to indoor unit 4a, 4b of comprising indoor expansion valve 41a, 41b of control part 8 to control.In addition, each equipment of the outside control part 38 of control part 8 to the outdoor unit 2 comprising outdoor expansion valve 24 is utilized to control.
-during accumulation of heat running-
In above-mentioned accumulation of heat running, when the accumulation of heat of the heat-storing material to heat-storage heat exchanger 28 finishes, control part 8 makes accumulation of heat running terminate and be transferred to heat running.Further, when have passed through Δ tbet interval time of regulation after when operating from accumulation of heat, defrosting running is transferred to.That is, interval time, Δ tbet referred to defrost the interval time between operating.Further, carry out in substantially during interval time Δ tbet accumulation of heat running when heating running and accumulation of heat running terminate after heat running, at every turn through interval time Δ tbet all carry out defrosting and operate.
As mentioned above, in aircondition 1, cooling operation can be carried out with switching and heat running.Further, by carrying out accumulation of heat running when heating running, can proceed to heat running, while carry out the accumulation of heat to heat-storing material, utilizing running by carrying out accumulation of heat when defrosting running, the accumulation of heat of heat-storing material can be utilized to carry out defrosting running.
(3) control during defrosting running
When carrying out the defrosting running utilizing running with above-mentioned accumulation of heat, when the defrosting ability of outdoor heat converter 23 exists more than needed, with carry out common heat running time (, carry out without accumulation of heat utilize running and defrosting running heat running time) identical, as long as the aperture that indoor control part 48a, 48b carry out indoor expansion valve 41a, 41b controls (be that the degree of subcooling of by indoor expansion valve 41a, 41b being undertaken control at this), guarantee the heating capacity of indoor heat converter 42a, 42b.But, when the defrosting ability of outdoor heat converter 23 does not exist more than needed, in order to the heating capacity of confinement cells inside heat exchanger 42a, 42b, need to make the aperture of indoor expansion valve 41a, 41b control from common heat running time different.At this, when the aperture of indoor expansion valve 41a, 41b is excessive relative to the aperture of outdoor expansion valve 24, the restriction of the heating capacity of indoor heat converter 42a, 42b becomes insufficient, and the defrosting ability of outdoor heat converter 23 becomes insufficient, terminate under therefore defrosting operates at the incomplete state of defrosting of outdoor heat converter 23.On the contrary, when the aperture of indoor expansion valve 41a, 41b is too small relative to the aperture of outdoor expansion valve 24, although the defrosting ability of outdoor heat converter 23 is abundant, but the heating capacity of indoor heat converter 41a, 41b is excessively limited, therefore no longer can obtain this advantage utilizing the defrosting running with accumulation of heat utilization running to carry out heating running fully.
So, at this, when only carrying out heating running, indoor control part 48a, 48b determine the aperture of indoor expansion valve 41a, 41b, and outside control part 38 determines the aperture of outdoor expansion valve 24, but when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, outside control part 38 not only determines the aperture of outdoor expansion valve 24, but also determines the aperture of indoor expansion valve 41a, 41b.
Therefore, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, outside control part 38 can consider the balance of the defrosting ability of outdoor heat converter 24 and the heating capacity of indoor heat converter 42a, 42b, with the aperture of the aperture and indoor expansion valve 41a, 41b of comprehensively determining outdoor expansion valve 24.
Thus, at this, first when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24 suitably can be determined.
In addition, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, needing the heating capacity reliably guaranteeing indoor heat converter 42a, 42b, and needing the aperture determining indoor expansion valve 41a, 41b.But, when outside control part 38 determines the aperture of indoor expansion valve 41a, 41b, be difficult to consider the impact of the pressure loss of the cold-producing medium in the refrigerant pipe (at this, mainly liquid refrigerant communicating pipe 6 and gas refrigerant communicating pipe 7) be connected with indoor unit 4a, 4b by outdoor unit 2 etc.And, when carrying out heating running in utilizing the defrosting of running to operate with accumulation of heat, in order to reliably terminate the defrosting of outdoor heat converter 23, also need the defrosting ability increasing outdoor heat converter 23.
So, at this, play till the first defrosting time taj from defrosting running, based on the dependency relation of indoor temperature Tra, the Trb (being generically and collectively referred to as Tr) of the condensation temperature Tc of the cold-producing medium in refrigerant loop 10 and the air conditioning object space of indoor unit 4a, 4b, determine the aperture of indoor expansion valve 41a, 41b.In addition, after have passed through the first defrosting time taj starting from defrosting running, to reduce the heating capacity of indoor heat converter 42a, 42b and the mode increasing the defrosting ability of outdoor heat converter 24 changes the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24.
Specifically, this according to Fig. 8 flow chart shown in step ST1 ~ ST5, utilize outside control part 38 to determine the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24.
First, when heating after the accumulation of heat running when heating running and accumulation of heat running terminate operates and terminates and start to carry out defrosting running (utilizing the defrosting running operated with accumulation of heat), in step ST1, the aperture of indoor expansion valve 41a, 41b is set to initial stage aperture MVrd1 during defrosting running, and the initial stage aperture MVod1 when aperture of outdoor expansion valve 24 being set to defrosting running.At this, outside control part 38 is utilized to determine the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24 as described above.
And, when defrost running meet heat/defrost preferentially start condition, the process of step ST3 ~ ST5 is transferred in process via step ST2, start the control carrying out determining the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24, to carry out the running making to heat preferential running or make defrosting preferential.At this, heating/defrost the preferentially condition of starting is aperture for the aperture and outdoor expansion valve 24 by changing indoor expansion valve 41a, 41b, determines whether to be in the state allowing to carry out to make to heat preferential running and the running that makes defrosting preferential.And, at this, when starting from defrosting running within the second defrosting time tah and from defrosting running starts, have passed through official hour tdef1 and threshold temperature Trdef (value that such as make indoor temperature Tr with the temperature of regulation be added after obtain) of condensation temperature Tc lower than the regulation obtained according to indoor temperature Tr, satisfied heat/defrost preferentially start condition.At this, the second defrosting time tah is the time of carrying out making heating preferential running or the running that makes defrosting preferential from defrosting running starts.In addition, time tdef1 be play from defrosting running translate into make to heat preferential running or make defrosting preferential running till stand-by period, be than second defrosting time tah short a lot of time.
Then, when transfer to from step ST2 step ST3 defrosting running meet heat priority condition, transfer to the process of step ST4, carry out the control that the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24 are determined, to carry out making to heat preferential running.At this, heat the condition that priority condition is the state for determining whether to be in the heating capacity not guaranteeing indoor heat converter 42a, 42b.And, at this, starting from defrosting running within the first defrosting time taj (time short than the second defrosting time tah) and to the transfer of step ST3, have passed through official hour tdef2 and condensation temperature Tc lower than the threshold temperature Trdef obtained according to indoor temperature Tr (identical with the threshold temperature Trdef that above-mentioned heating/defrost preferentially starts under condition) when, satisfied heat priority condition.At this, time tdef2 is the stand-by period of the aperture hold mode for maintaining step ST3.And, when meet when carrying out the process of step ST3 heat priority condition, transfer to the process of step ST4, increase the aperture (increasing aperture Δ MVrd2 at this) of indoor expansion valve 41a, 41b, and reduce the aperture (reducing aperture Δ MVod2 at this) of outdoor expansion valve 24, get back to the process of step ST3.At this, utilize outside control part 38 whether to meet as described above and heat the judgement of priority condition (comprising the judgement undertaken by threshold temperature Trdef) and the determination of the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24.That is, at this, till have passed through the first defrosting time taj starting from defrosting running (initial stage of defrosting running), based on the dependency relation of condensation temperature Tc and indoor temperature Tr, the aperture of indoor expansion valve 41a, 41b is suitably determined.By repeatedly carrying out this step ST3, heating the judgement of priority condition and the process of step ST4, as shown in Figure 9, can to play till the first defrosting time taj (namely from defrosting running, initial stage in defrosting running), increase the aperture of indoor expansion valve 41a, 41b, and reduce the aperture of outdoor expansion valve 24, preferentially guarantee the heating capacity of indoor heat converter 42a, 42b, and carry out defrosting running.
Then, when the defrosting running transferring to step ST3 from step ST2 meets defrosting priority condition, transfer to the process of step ST5, carry out the control that the aperture of indoor expansion valve 41a, 41b and the aperture of outdoor expansion valve 24 are determined, to carry out the running making defrosting preferential.At this, defrosting priority condition is the condition of the state of ability for determining whether to be in the defrosting not guaranteeing outdoor heat converter 23.And, at this, when starting from defrosting running through the first defrosting period taj and to the transfer of step ST3 through official hour tdef3 and the temperature of the cold-producing medium of the outlet of outdoor heat converter 23, i.e. outdoor heat hand over defrosting running medium temperature Tdefm (temperature of for judge defrost the operate defrosting running end temp Tdefe below that whether finish) of outlet temperature Tol2 lower than regulation, meet defrosting priority condition.At this, time tdef3 is the stand-by period of the aperture hold mode for maintaining step ST3.And, when meet defrosting priority condition when carrying out the process of step ST3, transfer to the process of step ST5, reduce the aperture of indoor expansion valve 41a, 41b (at this, only reduce aperture Δ MVrd3), and increase the aperture (at this, only increasing aperture Δ MVod3) of outdoor expansion valve 24, get back to the process of step ST3.At this, outside control part 38 is utilized whether to meet the determination of the aperture of the defrosting judgement of priority condition and the aperture of indoor expansion valve 41a, 41b and outdoor expansion valve 24 as described above.That is, at this, after have passed through the first defrosting time taj starting from defrosting running (that is, making to heat preferential defrosting running terminates rear), outlet temperature Tol2 is handed over suitably to determine the aperture of indoor expansion valve 41a, 41b based on outdoor heat.By repeatedly carrying out this step ST3, the defrosting judgement of priority condition and the process of step ST5, as shown in Figure 9, can after have passed through the first defrosting time taj starting from defrosting running, reduce the aperture of indoor expansion valve 41a, 41b, and increase the aperture of outdoor expansion valve 24, reduce the heating capacity of indoor heat converter 42a, 42b, and increase the defrosting ability of outdoor heat converter 23, thus can translate into from making to heat preferential running the running making defrosting preferential.
Then, from step ST2 transfer to step ST3 defrosting running (also comprising the running making to heat preferential running and make defrosting preferential) when from defrosting running start have passed through the second defrosting period tah, get back to the process of step ST1, make the aperture of indoor expansion valve 41a, 41b be back into the initial stage aperture MVrd1 defrosted when operating, and make the aperture of outdoor expansion valve 24 be back into the initial stage aperture MVod1 defrosted when operating.Therefore, compared with the change of the aperture of indoor expansion valve 41a, 41b of carrying out with the process by step ST4, ST5 and the aperture of outdoor expansion valve 24, sharply can reduce the aperture of indoor expansion valve 41a, 41b, and sharply can increase the aperture of outdoor expansion valve 24, therefore, it is possible to promote the running making defrosting preferential further, until because of defrosting running more than the end temp Tdefe that reaches regulation or through regulation defrosting running end time tdefe and terminate defrosting running, thus reliably can terminate the defrosting of outdoor heat converter 23.
(4) variation 1
In the above-described embodiment, form the equipment of refrigerant loop 10 and have an impact to the time needed for defrosting from the scattering losses of heat-storing material, the required time of therefore defrosting is in the lower and longer tendency of outdoor temperature Ta.Therefore, it is desirable that also determine the time, i.e. the first defrosting time taj that carry out making to heat preferential running based on outdoor temperature Ta.
So, at this, determine the first defrosting time taj based on outdoor temperature Ta.
Specifically, first, the second defrosting time tah is defined as the function of that outdoor temperature Ta shown in following formula 1.
Tah=Ta+tah0 ... (formula 1)
At this, tah is a reference value of the second defrosting time tah.Adopt formula 1, outdoor temperature Ta is lower, and the second defrosting time tah is shorter.Thus, the time shorten of the preferential running of the defrosting making to be undertaken by above-mentioned step ST3, ST5 of defrosting running, is set to that the time of the running (from playing till defrosting running terminates through the second defrosting time tah) of the aperture (=MVrd1) of indoor expansion valve 41a, the 41b in above-mentioned step ST1 and the aperture (=MVod1) of outdoor expansion valve 24 is elongated.
Further, the second defrosting time tah determined by formula 1 and formula 2 is used to determine the first defrosting time taj.
Taj=tah – tah1 ... (formula 2)
At this, the time of the running that the defrosting that tah1 is equivalent to carry out making to be undertaken by above-mentioned step ST3, ST5 is preferential.Adopt formula 1,2, outdoor temperature Ta is lower, and the first defrosting time taj is shorter.Thus, the time shorten heating preferential running making to be undertaken by above-mentioned step ST3, ST4 of defrosting running.
Thus, at this, by determining the first defrosting time taj carrying out making to heat preferential running based on outdoor temperature Ta, the running carrying out making defrosting preferential can be extended, reliably terminate the defrosting of outdoor heat converter 23.
In addition, at this, not only determine the first defrosting time taj based on outdoor temperature Ta, but also determine the second defrosting time tah, but also can only determine the first defrosting time taj based on outdoor temperature Ta.
(5) variation 2
In above-mentioned embodiment and variation 1, carry out heating running in utilizing the defrosting of running to operate with accumulation of heat.Further, in this case, when the aperture of indoor expansion valve 41a, 41b becomes excessive, the cold-producing medium in the exit of indoor heat converter 42a, 42b easily becomes gas-liquid two-phase state.So, in the refrigerant pipe that the outlet side (hydraulic fluid side) of indoor heat converter 42a, 42b is connected with the entrance side (hydraulic fluid side) of heat-storage heat exchanger 28 playing function as the evaporimeter of cold-producing medium (be liquid refrigerant communicating pipe 6 etc. at this), the cold-producing medium of easy gassy state.At this, when not arranging receiver in the part be connected with the entrance side (hydraulic fluid side) of heat-storage heat exchanger 28 playing function as the evaporimeter of cold-producing medium by the outlet side (hydraulic fluid side) of indoor heat converter 42a, 42b as refrigerant loop 10, liquid refrigerant may be there is and get back to so-called liquid backflow in compressor 21 via heat-storage heat exchanger 28.Further, when liquid backflow occurs, there is the tendency reduced in the degree of superheat SHd of the cold-producing medium of discharging from compressor 21.
So, at this, outdoor control part 38, based on the degree of superheat SHd of the cold-producing medium of discharging from compressor 21, judges because the aperture of indoor expansion valve 41a, 41b becomes excessive and liquid backflow is occurred.At this, according to the discharge pressure Pd detected by discharge pressure the sensor 32 and discharge temperature Td detected by discharge temperature sensor 34, calculate the degree of superheat of the cold-producing medium of discharging from compressor 21.More specifically, first discharge pressure Pd be converted into the saturation temperature of cold-producing medium and obtain condensation temperature Tc.Further, degree of superheat SHd is obtained by deducting condensation temperature Tc from discharge temperature Td.
Specifically, at this as shown in Figure 10, in the control when above-mentioned defrosting operates, when degree of superheat SHd is lower than the threshold degree of superheat, outdoor control part 24 judges to there occurs liquid backflow.Further, the aperture of indoor expansion valve 41a, 41b is reduced as required.
First, the condition for transferring to step ST2 from step ST1, namely heat/defrost preferentially in condition, add that degree of superheat SHd is the condition of the first more than threshold degree of superheat SHd1 of regulation further, be used as the condition for transferring to step ST2 from step ST1.Thus, when carrying out the process of step ST1, namely, the aperture of indoor expansion valve 41a, 41b is being set to initial stage aperture MVrd1, and the aperture of outdoor expansion valve 24 is set in the state of initial stage aperture MVod1, can prevent from transferring to and the aperture of indoor expansion valve 41a, 41b may be made to become excessive heat preferential running (process of step ST3, ST4).
In addition, when carrying out the process of step ST1, through official hour tdef4 (playing the stand-by period transferred to till next process from defrosting running) starting from defrosting running, and when degree of superheat SHd is lower than the 3rd threshold degree of superheat SHd3 specified, judge to there occurs liquid backflow in compressor 21, transfer to the process of step ST6.At this, the 3rd threshold degree of superheat SHd3 is set to the value lower than the first threshold degree of superheat SHd1.And, in step ST6, the aperture of indoor expansion valve 41a, 41b is set to that liquid backflow eliminates aperture MVrd4 (being less than the aperture of initial stage aperture MVrd1), and the aperture of outdoor expansion valve 24 is set to that liquid backflow eliminates aperture MVod4 (be with initial stage aperture MVod1 identical aperture at this).Thus, the liquid backflow in compressor 21 is eliminated.And, when the liquid backflow in compressor 21 being eliminated and degree of superheat SHd reaches the 3rd more than threshold degree of superheat SHd3 of regulation, again carry out the process of step ST1, that is, be returned as and the aperture of indoor expansion valve 41a, 41b be set to initial stage aperture MVrd1 and the aperture of outdoor expansion valve 24 be set to the state of initial stage aperture MVod1.
In addition, when carrying out the process of step ST2 ~ ST5, when degree of superheat SHd becomes the second threshold degree of superheat SHd2 being less than regulation, judge, in compressor 21, liquid backflow occurs, even if without the second defrosting time tah from defrosting running starts, the process of interrupt step ST2 ~ ST5, carries out the process of step ST1, that is, be returned as and the aperture of indoor expansion valve 41a, 41b be set to initial stage aperture MVrd1 and the aperture of outdoor expansion valve 24 be set to the state of initial stage aperture MVod1.Thus, the liquid backflow in compressor 21 is eliminated.
Thus, at this, can utilize with accumulation of heat in the defrosting running of running, suitably judge whether the aperture of indoor expansion valve 41a, 41b becomes excessive, while carry out heating running.
Industrial applicibility
The present invention can be widely used in a kind of aircondition, this aircondition comprises refrigerant loop, this refrigerant loop has the heat-storage heat exchanger carrying out heat exchange between cold-producing medium and heat-storing material, this aircondition carries out accumulation of heat running, and can accumulation of heat utilization running be carried out when defrosting running simultaneously and heat running, wherein above-mentioned accumulation of heat running refers to by making heat-storage heat exchanger play function as the radiator of cold-producing medium and carries out the running of accumulation of heat to heat-storing material, above-mentioned accumulation of heat utilizes running to refer to by making heat-storage heat exchanger carry out the running of dispelling the heat as the evaporimeter performance function of cold-producing medium from heat-storing material.
(symbol description)
1 ... aircondition;
2 ... outdoor unit;
4a, 4b ... indoor unit;
10 ... refrigerant loop;
21 ... compressor;
23 ... outdoor heat converter;
24 ... outdoor expansion valve;
28 ... heat-storage heat exchanger;
38 ... outside control part;
41a, 41b ... indoor expansion valve;
42a, 42b ... indoor heat converter;
48a, 48b ... indoor control part.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2005 – No. 337657 publications

Claims (5)

1. an aircondition (1), comprise refrigerant loop (10), this refrigerant loop (10) has compressor (21), outdoor heat converter (23), indoor heat converter (42a, 42b) and heat-storage heat exchanger (28), this heat-storage heat exchanger (28) carries out heat exchange between cold-producing medium and heat-storing material
Described this aircondition (1) carries out accumulation of heat running, and can accumulation of heat utilization running be carried out when defrosting running simultaneously and heat running, wherein, described accumulation of heat running refers to by making described heat-storage heat exchanger play function as the radiator of described cold-producing medium and carries out the running of accumulation of heat to described heat-storing material, described defrosting running refers to by making described outdoor heat converter play function as the radiator of described cold-producing medium and carries out the running of the defrosting of described outdoor heat converter, described accumulation of heat utilizes running to refer to by making described heat-storage heat exchanger carry out the running of dispelling the heat as the evaporimeter performance function of described cold-producing medium from described heat-storing material, it is described that to heat running be instigate described indoor heat converter to play the running of function as the radiator of described cold-producing medium,
The feature of described aircondition is,
Described refrigerant loop also has:
Indoor expansion valve (41a, 41b), this indoor expansion valve (41a, 41b) is for changing the flow of the described cold-producing medium flowed in described indoor heat converter; And
Outdoor expansion valve (24), this outdoor expansion valve (24) for changing the flow of the described cold-producing medium flowed in described outdoor heat converter,
Described indoor heat converter and described indoor expansion valve are located at indoor unit (4a, 4b),
Described indoor unit has indoor control part (48a, 48b), and when heating running described in only carrying out, the aperture of described indoor expansion valve is determined in described indoor control part (48a, 48b),
Described outdoor heat converter and described outdoor expansion valve are located at outdoor unit (2),
Described outdoor unit has outside control part (38), when heating running described in only carrying out, the aperture of described outdoor expansion valve is determined in described outside control part (38), when heating running described in carrying out in the described defrosting running utilizing running with described accumulation of heat, the aperture of described indoor expansion valve and the aperture of described outdoor expansion valve are determined in described outside control part (38).
2. aircondition (1) as claimed in claim 1, is characterized in that,
When heating running described in carrying out in the described defrosting running utilizing running with described accumulation of heat, play from described defrosting running till the first defrosting time, based on the dependency relation of the indoor temperature of the condensation temperature of the described cold-producing medium in described refrigerant loop (10) and the air conditioning object space of described indoor unit (4a, 4b), determine the aperture of described indoor expansion valve (41a, 41b).
3. aircondition (1) as claimed in claim 2, is characterized in that,
After have passed through described first defrosting time starting from described defrosting running, change the aperture of described indoor expansion valve (41a, 41b) and described outdoor expansion valve (24), to make the heating capacity of described indoor heat converter (42a, 42b) reduce, and the defrosting ability of described outdoor heat converter (23) is improved.
4. aircondition (1) as claimed in claim 3, is characterized in that,
Based on the outdoor temperature of the space outerpace configured for described outdoor unit (2), determine described first defrosting time.
5. the aircondition (1) according to any one of claim 2 to 4, is characterized in that,
In described defrosting running, based on the degree of superheat of the described cold-producing medium of discharging from described compressor (21), judge whether the aperture of described indoor expansion valve (41a, 41b) becomes excessive.
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