CN105588360A - Heat accumulation outdoor unit, heat pump system and control method of heat accumulation outdoor unit and heat pump system - Google Patents
Heat accumulation outdoor unit, heat pump system and control method of heat accumulation outdoor unit and heat pump system Download PDFInfo
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- CN105588360A CN105588360A CN201510374718.1A CN201510374718A CN105588360A CN 105588360 A CN105588360 A CN 105588360A CN 201510374718 A CN201510374718 A CN 201510374718A CN 105588360 A CN105588360 A CN 105588360A
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Abstract
The embodiment of the invention provides a heat accumulation outdoor unit, a heat pump system and a control method of the heat accumulation outdoor unit and the heat pump system, and relates to the field of air conditioners. The exhaust temperature of a compressor can be reduced in a refrigeration mode, and therefore the refrigerating efficiency of the heat pump system can be improved. The outdoor unit comprises the compressor, an outdoor heat exchanger, a heat dissipation module and a first branch. A first port of the compressor is connected with an air side stop valve. A second port of the compressor is connected with a first port of the outdoor heat exchanger. A second port of the outdoor heat exchanger is connected with a first port of the heat dissipation module. A second port of the heat dissipation module is connected with a first port of the first branch. A second port of the first branch is connected with a liquid side stop valve. When a refrigerant flows through the heat dissipation module, the heat dissipation module absorbs heat from the compressor, and the exhaust temperature of the compressor is reduced. The control method is used for manufacturing and controlling of the heat pump system.
Description
Technical field
The present invention relates to field of air conditioning, relate in particular to a kind of accumulation of heat off-premises station, heat pump and control thereofMethod.
Background technology
Heat pump is by utilizing the energy consumption of the heat energy reduction air-conditioning system self in natural environment, with itThe advantage of low energy consumption is used widely and develops in green energy resource technical field. Heat pump comprises chamberOuter machine and indoor set, comprise compressor in off-premises station, for cold-producing medium is compressed, and will pass throughCold-producing medium output after compression. Compressor utilizes electric energy to do work to cold-producing medium in the course of the work, thereforeCompressor self can produce certain heat, and cold-producing medium also can discharge heat in compressed process simultaneouslyAmount, raises the temperature of compressor self.
Under refrigeration mode, the high temperature and high pressure gaseous refrigerant of compressor output is through outdoor heat converterBe condensed into the liquid refrigerant of cryogenic high pressure, if compressor heat can not dissipate in time, will makeCompressor exhaust temperature is too high, i.e. the refrigerant temperature of compressor output is too high, causes compressor reliableProperty reduces and the problem such as heat pump refrigerating efficiency reduction. In the situation that environment temperature is higher,The problems referred to above are more outstanding.
Summary of the invention
Embodiments of the invention provide a kind of accumulation of heat off-premises station, heat pump and control method thereof, canIn the decline delivery temperature of low compressor of refrigeration mode, thereby improve heat pump refrigerating efficiency.
For achieving the above object, embodiments of the invention adopt following technical scheme:
First aspect, provides a kind of accumulation of heat off-premises station, comprising: compressor, outdoor heat exchanger, heat radiationModule and the first branch road;
The first port of described compressor is connected with gas side stop valve, the second port of described compressor withThe first port of described outdoor heat exchanger connects, the second port of described outdoor heat exchanger and described heat radiationThe first port of module connects, the second port of described radiating module and the first end of described the first branch roadMouth connects, and the second port of described the first branch road is connected with liquid side stop valve;
When described accumulation of heat off-premises station is operated in refrigeration mode lower time, the system flowing out from described gas side stop valveCryogen flows into described compressor by being connected between described compressor and described gas side stop valve;
Cold-producing medium through overcompression flows by the connection between described compressor and described outdoor heat exchangerEnter described outdoor heat exchanger;
Cold-producing medium flows into described loose by being connected between described outdoor heat exchanger and described radiating moduleThermal modules, described radiating module is for absorbing heat, the row who reduces described compressor from described compressorTemperature degree;
Described the first branch road, cuts for the cold-producing medium of the described radiating module of flowing through being delivered to described liquid sideOnly valve.
Second aspect, provides a kind of heat pump, comprises accumulation of heat off-premises station and indoor set;
Wherein, the off-premises station that described off-premises station provides for first aspect;
Described indoor set comprises: indoor heat exchanger and the 5th throttling arrangement, of described indoor heat exchangerOne port is connected with the first port of described indoor set, the second port of described indoor heat exchanger with described inThe second port of the 5th throttling arrangement connects, the first port of described the 5th throttling arrangement and described indoorThe second port of machine connects;
The gas side stop valve of described accumulation of heat off-premises station is by first of the first branch pipe and described indoor setPort connects, and the liquid side stop valve of described accumulation of heat off-premises station is by the second branch pipe and described indoor setThe second port connects.
The third aspect, provides a kind of control method of heat pump, is applied to that second aspect providesHeat pump, comprising: when the first accumulation of heat off-premises station is operated in refrigeration mode lower time,
Close the second branch road;
According to outside the first regenerator described in the delivery temperature control of described the first accumulation of heat compressor of outdoor unitThe on off state of the first branch road of machine.
Accumulation of heat off-premises station, heat pump and control method thereof that embodiments of the invention provide, work as workWhile doing under refrigeration mode, cold-producing medium flows into off-premises station by gas side stop valve from indoor set, compressedInflow outdoor heat exchanger after machine compression, and further after outdoor heat converter condensation, by looseThe first port of thermal modules flows into radiating module, and cold-producing medium is flowed through in the process of radiating module, from describedCompressor absorbs heat, thereby has reduced the delivery temperature of described compressor, thereby has improved heat pump systemControlling cold efficiency. Especially, in the time that the operating ambient temperature of off-premises station is higher, compressor operating loadGreatly, heating problem is more outstanding, and the off-premises station that embodiments of the invention provide is carried in this caseThe effect of high heat pump refrigerating efficiency is also more remarkable.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below by rightDuring embodiment describes, the accompanying drawing of required use is briefly described, apparently, and in the following describesAccompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, notPay under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of a kind of accumulation of heat off-premises station that Fig. 1 provides for embodiments of the invention one;
The structural representation of the another kind of accumulation of heat off-premises station that Fig. 2 provides for embodiments of the invention one;
Accumulation of heat off-premises station cold-producing medium stream under refrigeration mode that Fig. 3 provides for embodiments of the invention oneTo schematic diagram;
Accumulation of heat off-premises station cold-producing medium stream under heating mode that Fig. 4 provides for embodiments of the invention oneTo schematic diagram;
Accumulation of heat off-premises station cold-producing medium stream under defrosting mode that Fig. 5 provides for embodiments of the invention oneTo schematic diagram;
The structural representation of another accumulation of heat off-premises station that Fig. 6 provides for embodiments of the invention one;
In the heat pump that Fig. 7 provides for embodiments of the invention two, accumulation of heat off-premises station and indoor set connectConnect the schematic diagram of relation;
The control method flow process signal of a kind of heat pump that Fig. 8 provides for embodiments of the invention threeFigure.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is enteredRow is described clearly and completely, and obviously, described embodiment is only the present invention's part embodiment,Instead of whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not havingHave and make the every other embodiment obtaining under creative work prerequisite, all belong to the present invention protectionScope.
For the ease of the clear technical scheme of describing the embodiment of the present invention, in an embodiment of the present invention,Adopt the printed words such as " first ", " second " to enter the essentially identical identical entry of function and efficacy or similar itemRow is distinguished, and it will be appreciated by those skilled in the art that the printed words such as " first ", " second " are not to quantityLimit with execution order.
Especially, in embodiments of the invention by cold-producing medium, the flow process in the middle of off-premises station entersLine description, thus the course of work of off-premises station is described. Unless otherwise noted, reality of the present inventionExecute the connection between module or the device of indication in example, all between finger print piece or device by transmissionThe connection that the pipeline of cold-producing medium forms; The port of indication in embodiments of the invention, all finger print piece orPerson's device is for flowing into or flow out the interface of cold-producing medium.
In addition, it will be understood by those of skill in the art that certain of the off-premises station mentioned in the present embodimentBeing connected between module or device and indoor set, not refer to this module or device directly and indoor setConnect. In actual application scenarios, between certain module or device and indoor set of off-premises station,May also need to connect by the device of such as branch pipe etc.
Embodiment mono-
Embodiments of the invention provide a kind of accumulation of heat off-premises station, shown in Fig. 1, and accumulation of heat off-premises station 1Comprise: compressor 101, outdoor heat exchanger 102, radiating module 103 and the first branch road 104.
First the function of compressor 101, outdoor heat exchanger 102 and radiating module 103 is saidBright as follows:
Compressor 101, for compressing cold-producing medium. Compressor 101 comprises two ports,In accumulation of heat off-premises station 1 course of work, cold-producing medium flows into and presses from the first port 1011 of compressor 101Contracting machine 101, after compressor 101 compresses cold-producing medium, by the cold-producing medium through overcompression from compressionThe second port one 012 of machine 101 is exported.
Outdoor heat exchanger 102 for cold-producing medium is carried out to heat exchange, completes under different working modesDifference in functionality. Optionally, outdoor heat exchanger 102 is aluminium foil copper tube with fins heat exchanger or aluminum fin formulaMicro-channel heat exchanger.
Under refrigeration mode, outdoor heat exchanger 102 completes the function of condenser, and cold-producing medium is carried out to heatExchange refers to from cold-producing medium and absorbs heat, thereby refrigerant temperature is reduced and condensation.
Under heating mode, outdoor heat exchanger 102 completes the function of evaporimeter, and cold-producing medium is carried out to heatExchange is to point to cold-producing medium quantity of heat given up, becomes gaseous state thereby refrigerant temperature is raise. Outdoor changingHot device 102, to cold-producing medium quantity of heat given up, makes self temperature reduction, causes shell frosting around, shadowRing heating effect, therefore need defrosting. Under defrosting mode, outdoor heat exchanger 102 is inhaled from cold-producing mediumReceive heat, thereby play the effect of defrost.
Radiating module 103, for absorbing heat from compressor 101, thereby reduction compressor 101Delivery temperature.
In conjunction with the above-mentioned function to compressor 101, outdoor heat exchanger 102 and radiating module 103Illustrate, further to compressor 101, outdoor heat exchanger 102, radiating module 103 and the first branch road104 annexation is described as follows:
The first port 1011 of compressor 101 is connected with gas side stop valve 105, compressor 101The second port one 012 is connected with the first port 1021 of outdoor heat exchanger 102, outdoor heat exchanger 102The second port one 022 be connected with the first port 1031 of radiating module 103, radiating module 103The second port one 032 is connected with the first port 1041 of the first branch road 104, of the first branch road 104Two port ones 042 are connected with liquid side stop valve 106.
Further, shown in Fig. 1, accumulation of heat off-premises station 1 is operated in to refrigeration mode refrigeration of lower timeThe flow process of agent is described as follows:
Accumulation of heat off-premises station 1 is operated in refrigeration mode lower time, the cold-producing medium flowing out from gas side stop valve 105By being connected between compressor 101 and gas side stop valve 105 flowing into compressor 101.
Cold-producing medium through overcompression flows into by the connection between compressor 101 and outdoor heat exchanger 102Outdoor heat exchanger 102. Cold-producing medium is by being connected between outdoor heat exchanger 102 and radiating module 103Flow into radiating module 103. Be that cold-producing medium flows into outdoor from the first port 1021 of outdoor heat exchanger 102Heat exchanger 102, after outdoor heat exchanger 102 condensations from the second port one 022 of outdoor heat exchanger 102Flow out, and further flow into radiating module 103.
Cold-producing medium is flowed through in the process of radiating module 103, makes thereby absorb heat from compressor 101Compressor 101 delivery temperatures reduce. Optionally, the pipeline of radiating module 103 refrigerant conveyings canBe coiled in around compressor 101 shells, be convenient to cold-producing medium and absorb heat from compressor 101. NeedBright, the pipeline of radiating module 103 refrigerant conveyings can directly contact with compressor 101, orPerson, by Heat Conduction Material and compressor 101 mediate contacts, all can reach and absorb heat reduction compressorThe object of 101 delivery temperatures.
The cold-producing medium of radiating module 103 of flowing through flows out from the second port one 032 of radiating module 103,The first port 1041 by the first branch road 104 flows into the first branch road 104, and further by firstRoad 104 is delivered to liquid side stop valve 106.
In accumulation of heat off-premises station 1 course of work, indoor set and accumulation of heat off-premises station 1 are by gas side stop valve105 are connected with liquid side stop valve 106. Under refrigeration mode, cold-producing medium by gas side stop valve 105 fromIndoor set flows into accumulation of heat off-premises station 1, flows into indoor by liquid side stop valve 106 from accumulation of heat off-premises station 1Machine, forms the circulation between indoor set and accumulation of heat off-premises station 1.
The off-premises station that embodiments of the invention provide, when being operated in refrigeration mode lower time, cold-producing medium is logicalCross gas side stop valve and flow into off-premises station from indoor set, inflow outdoor heat exchanger after compressor compression,And further after outdoor heat converter condensation, by the first port inflow heat radiation mould of radiating modulePiece, cold-producing medium is flowed through in the process of radiating module, absorbs heat, thereby reduced compression from compressorThe delivery temperature of machine, thus heat pump refrigerating efficiency improved. Especially, when the work of off-premises stationWhen environment temperature is higher, compressor operating load is large, and heating problem is more outstanding, enforcement of the present inventionThe effect that the routine off-premises station providing improves heat pump refrigerating efficiency is in this case also more aobviousWork.
Shown in Fig. 2, one preferred embodiment in, accumulation of heat off-premises station 1 also comprises four-wayReversal valve 107, controls for the flow direction to cold-producing medium. Further, for preventing compressor 101Hydraulic compression occurs, and accumulation of heat off-premises station 1 also comprises gas-liquid separator 108.
Four-way change-over valve 107 comprises 4 ports, is respectively used under different working modes cold-producing mediumThe flow direction control. Cold-producing medium is from the second port one 012 of compressor 101 flows out, by pressingConnection between contracting machine 101 and four-way change-over valve 107 flows into four-way change-over valve 107. Four-way change-over valve107 deliver to other module or device by different port by cold-producing medium transmission. Four-way change-over valve 107The first port 1071 be connected with the second port one 012 of compressor 101, four-way change-over valve 107The 3rd port one 073 is connected with gas side stop valve, the 4th port one 074 and chamber of four-way change-over valve 107The first port 1021 of external heat exchanger 102 connects. The second port one 072 of four-way change-over valve 107 withThe input of gas-liquid separator 108 connects, the output of gas-liquid separator 108 and compressor 101The first port 1011 connects.
Optionally, with reference to Fig. 2, accumulation of heat off-premises station 1 can further include check valve 109, oilSeparator 110 and oil return capillary 111.
The input of check valve 109 is connected with the second port one 012 of compressor 101, check valve 109Output be connected with the input of oil eliminator 110, the gas output end of oil eliminator 110 and fourThe first port 1071 of logical reversal valve 107 connects, the oily output of oil eliminator 110 and oil return hairOne end of tubule 111 connects, the input of the other end of oil return capillary 111 and gas-liquid separator 108End connects. Especially, being connected between oil eliminator 110 and oil return capillary 111, and oil returnBeing connected between the input of capillary 111 and gas-liquid separator 108, for delivery of isolated oil,But not cold-producing medium.
The flow process of cold-producing medium under different working modes time below in conjunction with accumulation of heat off-premises station 1, to holdingThe internal structure of hot off-premises station 1 is further described.
The first, refrigeration mode
Under refrigeration mode, the 4th port one 074 and four-way change-over valve 107 of four-way change-over valve 107The first port 1071 connect, the second port one 072 and the four-way change-over valve 107 of four-way change-over valve 107The 3rd port one 073 connect.
Optionally, shown in Fig. 3, accumulation of heat off-premises station 1 also comprises the 3rd branch road 112. The 3rdFirst port 1121 on road 112 is connected with liquid side stop valve 106, the second end of the 3rd branch road 112Mouth 1122 is connected with the second port one 022 of outdoor heat exchanger 102. Under refrigeration mode, the 3rdRoad 112 is in open mode. Wherein, branch road refers in open mode, and cold-producing medium can be flowed through thisBranch road. Optionally, the 3rd branch road 112 comprises the 3rd throttling arrangement 1123, the three throttling arrangements 1123Two ends respectively as the first port 1121 of the 3rd branch road 112 and the second end of the 3rd branch road 112Mouth 1122. Wherein the 3rd throttling arrangement 1123 can be electric expansion valve.
The first branch road 104 can be open mode under refrigeration mode, can be also closed condition.Wherein branch road refers in closed condition, cold-producing medium this branch road of can not flowing through. Optionally, the first branch road104 comprise first throttle device 1043, and the two ends of first throttle device 1043 are respectively as firstFirst port 1041 on road 104 and the second port one 042 of the first branch road 104. Wherein first throttleDevice 1043 can be electric expansion valve.
Below in conjunction with the flow direction of the cold-producing medium shown in Fig. 3, to opening or closed condition of branch roadIllustrate.
Cold-producing medium after compressor 101 compressions flows out from the second port one 012 of compressor 101,The first port 1071 by four-way change-over valve 107 flows into four-way change-over valve 107, from four-way change-over valve107 the 4th port one 074 flows out, and flows into chamber by the first port 1021 of outdoor heat exchanger 102External heat exchanger 102, after outdoor heat exchanger 102 condensations from the second port of outdoor heat exchanger 1021022 flow out.
When the first branch road 104 is during in open mode, cold-producing medium is from the second end of outdoor heat exchanger 102After flowing out, mouth 1022 is divided into two tributaries.
Flowing through after the 3rd branch road 112 in the first tributary, flows to indoor set by liquid side stop valve 106.
The second tributary flows into radiating module 103.
In conjunction with Fig. 3, radiating module 103 specifically comprises the 4th throttling arrangement 1033 and recuperation of heat coil pipe1034. The first port of the 4th throttling arrangement 1033 is as the first port 1031 of radiating module 103,The second port of the 4th throttling arrangement 1033 is connected with the first port of recuperation of heat coil pipe 1034, and heat is returnedThe second port of closing quotation pipe 1034 is as the second port one 032 of radiating module 103.
Wherein, the 4th throttling arrangement 1033 is specifically as follows magnetic valve. Under refrigeration mode, whenWhen four throttling arrangements 1033 are opened, the first branch road 104 is also in open mode.
Recuperation of heat coil pipe 1034 directly contacts with compressor 101 or by Heat Conduction Material mediate contact.In the time that the cold-producing medium of condensation is flowed through recuperation of heat coil pipe 1034, the cold-producing medium of condensation is inhaled from compressor 101Receive heat, thereby reduced the delivery temperature of compressor 101. Recuperation of heat coil pipe 1034 coils conventionallyAround compressor 101 shells, to increase the contact-making surface of recuperation of heat coil pipe 1034 and compressor 101Long-pending, improve heat absorption efficiency.
Preferably, accumulation of heat off-premises station 1 also comprises storage heater 114, the first port 1141 of storage heater 114Be connected the second port one 142 of storage heater 114 and with the second port one 032 of radiating module 103The first port 1041 of one branch road 104 connects. Storage heater 114 comprises refrigerant line and accumulation of heat materialMaterial, heat-storing material is the phase change heat storage material of thermal storage density large (more than 200kJ/kg) preferably, withAmount of stored heat is large simultaneously to ensure storage heater 114 small volumes.
The second tributary, from radiating module 103 flows out, flows into storage heater 114, and at the storage heater of flowing throughThereby in 114 process, be condensed into liquid state to heat-storing material release heat, from storage heater 114 flows outFlow into the first branch road 104, from the first branch road 104 flows out, flow into indoor by liquid side stop valve 106Machine.
The first tributary and the second tributary flow into indoor set by liquid side stop valve 106, in the indoor system that completesAfter cold process, flow into accumulation of heat off-premises station 1 by gas side stop valve 105, from four-way change-over valve 107The 3rd port one 073 flows into four-way change-over valve 107, and further from the second end of four-way change-over valve 107Mouthfuls 1072 flow out, and finally flow back to compressor 101 by gas-liquid separator 108, complete at indoor set andCyclic process between accumulation of heat off-premises station 1.
Optionally, in the time that the delivery temperature of compressor 101 meets the demands, can close the first branch road104. Preferably, when the first branch road 104 is during in closed condition, the 4th in radiating module 103Throttling arrangement 1033 is also in closed condition. When the first branch road 104 is during in closed condition, refrigerationAgent can not be divided into two tributaries from the second port one 022 of outdoor heat exchanger 102 flows out, and only hasThe 3rd branch road 112 mono-tributary, tunnel of flowing through.
The second, heating mode
Under heating mode, the first port 1071 and four-way change-over valve 107 of four-way change-over valve 107The 3rd port one 073 connect, the second port one 072 and the four-way change-over valve 107 of four-way change-over valve 107The 4th port one 074 connect.
Optionally, shown in Fig. 4, accumulation of heat off-premises station 1 also comprises the second branch road 113, holds for working asHot off-premises station 1 is operated in heating mode lower time, by the cold-producing medium of the radiating module 103 of flowing through to compressor 101Carry. The first port 1131 of the second branch road 113 is connected with the second port one 032 of radiating module 103(in Fig. 4, not drawing), the second port one 132 and first of the outdoor heat exchanger 102 of the second branch road 113Port one 021 connects (in Fig. 4, not drawing). Concrete optional, the second branch road 113 comprises the second throttlingThe two ends of device 1133, the second throttling arrangements 1133 are respectively as the first port of the second branch road 1131131 and the second port one 132 of the second branch road 113. Wherein the second throttling arrangement 1133 can be electricitySub-expansion valve.
Preferably, Figure 4 shows that accumulation of heat off-premises station 1 also comprises the situation of storage heater 114, storage heater114 are connected between the second branch road 113 and radiating module 103. Concrete, the of storage heater 114One port 1141 is connected with the second port one 032 of radiating module 103, the second end of storage heater 114Mouth 1142 is connected with the first port 1131 of the second branch road 113.
Under heating mode, the first branch road 104 is in closed condition. It should be noted that secondRoad 113 in closed condition, can be open mode under refrigeration mode under heating mode, also canTo be closed condition. Below in conjunction with the flow direction of the cold-producing medium shown in Fig. 4, to branch road open orPerson's closed condition illustrates.
Under heating mode, the cold-producing medium after compressor 101 compressions is from the second end of compressor 101Mouth 1012 flows out, and flows into four-way change-over valve 107 by the first port 1071 of four-way change-over valve 107.The cold-producing medium flowing into from the first port 1071 of four-way change-over valve 107 is from of four-way change-over valve 107Three port ones 073 flow out, and flow into indoor set by gas side stop valve 105. Cold-producing medium is indoor completeBecome to heat after process, flow into accumulation of heat off-premises station 1 by liquid side stop valve 106, and by the 3rd branch roadThe first port 1121 of 112 flows into the 3rd branch road 112.
When the second branch road 113 is during in open mode, cold-producing medium is from the second port of the 3rd branch road 112After 1122 outflows, be divided into two tributaries.
The first tributary flows into four-way change-over valve 107 by outdoor heat converter, and the gas-liquid of further flowing throughSeparator 108 finally flows into compressor 101 by the first port 1011 of compressor 101.
The second tributary flows into radiating module 103 by the first port 1031 of radiating module 103, from looseAfter thermal modules 103 flows out, flow into storage heater 114 by the first port 1141 of storage heater 114, fromThe second port one 142 of storage heater 114 flows out, further by the first port of the second branch road 1131131 flow into the second branch roads 113, from the second port one 132 of the second branch road 113 flows out, with theOne tributary is converged, and finally flows into compressor 101, completes between indoor set and accumulation of heat off-premises station 1Cyclic process.
Optionally, in the time that the delivery temperature of compressor 101 meets the demands, can close the second branch road113. Preferably, when the second branch road 113 is during in closed condition, the 4th in radiating module 103Throttling arrangement 1033 is also in closed condition. When the second branch road 113 is during in closed condition, refrigerationAgent, from the second port one 122 of the 3rd branch road 112 flows out, can not be divided into two tributaries, only hasThe tributary, outdoor heat converter Yi road of flowing through.
The second, defrosting mode
Under defrosting mode, the inner connection status of four-way change-over valve 107 is with identical under heating mode,Be that the first port 1071 of four-way change-over valve 107 and the 3rd port one 073 of four-way change-over valve 107 connectConnect the second port one 072 of four-way change-over valve 107 and the 4th port one 074 of four-way change-over valve 107Connect.
Under defrosting mode, the second branch road 113 and the 3rd branch road 112 be in closed condition, firstRoad 104 is in open mode, for the cold-producing medium flowing out from liquid side stop valve 106 is delivered to heat radiationModule 103.
Shown in Fig. 5, under defrosting mode, the cold-producing medium after compressor 101 compressions is from compressionThe second port one 012 of machine 101 flows out, and flows into by the first port 1071 of four-way change-over valve 107Four-way change-over valve 107. The cold-producing medium flowing into from the first port 1071 of four-way change-over valve 107 is from four-wayThe 3rd port one 073 of reversal valve 107 flows out, and flows into indoor set by gas side stop valve 105.
It should be noted that, under defrosting mode, the gas that the cold-producing medium that flows into indoor set is HTHPState cold-producing medium, after inflow indoor set, release heat is condensed into the cold-producing medium of low temperature liquid, indoorComplete the process of heating, then flow into accumulation of heat off-premises station 1 by liquid side stop valve 106.
In conjunction with the above-mentioned explanation for flow of refrigerant process under heating mode, under heating mode, whenThe second branch road 113 is in the time of open mode, and the cold-producing medium storage heater 114 of flowing through, in storage heater 114Heat-storing material absorbs heat from cold-producing medium.
When accumulation of heat off-premises station 1 is from heating mode is switched to defrosting mode, the low temperature flowing out from indoor setLiquid refrigerant flows into the first branch road 104 from the second port one 042 of the first branch road 104, and flows successivelyThrough storage heater 114 and radiating module 103. In the process of storage heater 114 and radiating module 103 of flowing throughIn, low temperature liquid cold-producing medium absorbs it from storage heater 114 and under heating mode, absorbs the heat of storing,And further absorb heat from compressor 101, become the gaseous refrigerant of hyperthermia and superheating.
The gaseous refrigerant of hyperthermia and superheating flows out from the first port 1031 of radiating module 103, passes throughThe second port one 022 of outdoor heat exchanger 102 flows into outdoor heat exchanger 102, outdoor heat exchanger 102Absorb heat from cold-producing medium, thereby play the effect of defrost.
The cold-producing medium flowing out from outdoor heat exchanger 102 flow through four-way change-over valve 107, gas-liquid separator 108After, flow into compressor 101 from the first port 1011 of compressor 101, complete in indoor set and accumulation of heatCyclic process between off-premises station 1, in cyclic process to indoor set heat supply, and to outdoor heat exchanger102 defrost.
The radiating module 103 of accumulation of heat off-premises station 1 and storage heater 114, by inhaling from compressor 101Receive and storing heat, and further the heat of storage be used for outdoor heat exchanger 102 to defrost,Reach and reduced the object of compressor 101 delivery temperatures, and effectively utilized compressor 101 in workThe heat discharging in process.
Similar with the process of recycling the heat that discharges of compressor 101, can be to accumulation of heat off-premises station 1The heat discharging in some other device busy process is recycled. For example,, large-scale businessIn industry multi-connected machine system, the rated capacity of accumulation of heat off-premises station 1 is large, and the running current of unit is high, makesElectric component caloric value in the electrical appliance kit of accumulation of heat off-premises station 1 is larger equally, therefore can be to this portionDivide heat also to recycle.
Shown in Fig. 6, radiating module 103 is also for absorbing from the electrical appliance kit of accumulation of heat off-premises station 1Heat. Concrete, radiating module 103 comprises the first recuperation of heat coil pipe 1034 and the second recuperation of heat dishPipe 1035, the first recuperation of heat coil pipes 1034 directly contact or mediate contact with compressor 101, from pressingContracting machine 101 absorbs heat, and the second recuperation of heat coil pipe 1035 is straight with electrical appliance kit (not drawing in Fig. 6)Contact or mediate contact, absorb heat from electrical appliance kit. The first recuperation of heat coil pipe 1034 connects secondRecuperation of heat coil pipe 1035, the second recuperation of heat coil pipes 1035 connect storage heater 114. Storage heater 114 is depositedThe heat of storage can be brought into play the effect of defrost under defrosting mode, prevents accumulation of heat off-premises station thereby reached1 interior arrangement is overheated and recycle the effect of used heat.
The off-premises station that embodiments of the invention provide, by the first branch road, the second branch road andThree branch roads open or closed condition is adjusted, under refrigeration mode or heating mode, pass throughRadiating module absorbs the heat of compressor release and stores by storage heater, thereby has reduced compressionThe delivery temperature of machine. Under refrigeration mode, can improve heat pump refrigerating efficiency, under heating modeCan prevent overheat of compressor. Similarly, the heat discharging during to device busies such as electrical appliance kits carries outReclaim, can prevent equipment overheat. Further, under defrosting mode time, utilize storage heater to reclaimHeat, and compressor self discharge heat, outdoor heat exchanger is defrosted, thereby reachesPrevent that off-premises station interior arrangement is overheated and recycle the double effects of used heat. To outdoor heat exchangerWhen defrosting, off-premises station can continue heat supply to indoor set, can not cause because of defrosting chamberInterior temperature declines, thereby ensures user's comfortableness.
Embodiment bis-
The off-premises station providing based on embodiment mono-, embodiments of the invention two provide a kind of heat pump to beSystem, heat pump comprises more than one or one accumulation of heat off-premises station 1 and at least one indoor set 2,Fig. 7 is the schematic diagram of heat pump while comprising two accumulation of heat off-premises stations 1 and two indoor sets 2, whereinThe structure of accumulation of heat off-premises station 1 except the part being connected with indoor set 2 do not draw.
Indoor set 2 comprises indoor heat exchanger 21 and the 5th throttling arrangement 22, of indoor heat exchanger 21One port 2101 is connected with the first port 201 of indoor set 2, the second port of indoor heat exchanger 212102 are connected with the second port 2202 of the 5th throttling arrangement 22, first of the 5th throttling arrangement 22Port 2201 is connected with the second port 202 of indoor set 2.
The gas side stop valve 105 of accumulation of heat off-premises station 1 is by the first branch pipe 3 and first of indoor set 2Port 201 connects, and the liquid side stop valve 106 of accumulation of heat off-premises station 1 is by the second branch pipe 4 and indoorThe second port 202 of machine 2 connects.
Under defrosting mode and heating mode, cold-producing medium is through gas side stop valve 105 and the first branch pipe 3Flow into the first port 201 of indoor set 2. Flow into the liquid refrigerant of indoor set 2 through heating processTo indoor liquid refrigerant of emitting heat and become middle temperature high pressure, and by the second port of indoor set 2202 flow out indoor set 2, flow back to accumulation of heat off-premises station 1 through the second branch pipe 4 and liquid side stop valve 106.
Under refrigeration mode, cold-producing medium flows into indoor set through liquid side stop valve 106 and the second branch pipe 4The second port 202 of 2. Flow into the high pressure liquid refrigerant of indoor set 2 through the 5th throttling arrangement 22After reducing pressure by regulating flow, become the gas-liquid two-phase cold-producing medium of low-temp low-pressure, and absorb Indoor Thermal at process of refrigerastionQuantitative change is the gaseous state of low-temp low-pressure, and flows out indoor set 2 by the first port 201 of indoor set 2,Flow back to accumulation of heat off-premises station 1 through the gentle side stop valve of the first branch pipe 3.
The heat pump that embodiments of the invention provide, by off-premises station the first branch road, secondRoad and the 3rd branch road open or closed condition is adjusted, at refrigeration mode or heating modeUnder, absorb the heat of compressor release and store by storage heater by radiating module, thereby fallingThe low delivery temperature of compressor. Under refrigeration mode, can improve heat pump refrigerating efficiency, in systemUnder heat pattern, can prevent overheat of compressor. Further, under defrosting mode time, utilize storage heaterThe heat reclaiming, and the heat of compressor self release, defrost to outdoor heat exchanger, therebyReach the double effects that prevents that off-premises station interior arrangement is overheated and recycle used heat. Changing outdoorWhen hot device defrosts, off-premises station can continue heat supply to indoor set, can not make because of defrostingBecome indoor temperature to decline, thereby ensure user's comfortableness. When heat pump comprises more than one outdoorWhen machine, many off-premises stations can defrost in turn, when an off-premises station is operated in defrosting mode lower time,Other off-premises station is operated under heating mode, continues heat supply to indoor set, further ensures relaxing of userAdaptive, the defrosting cycle of simultaneously effective prolongation system.
Embodiment tri-
The heat pump providing based on embodiment bis-, the embodiment of the present invention three provides a kind of heat pumpControl method, shown in Fig. 8, comprise the following steps:
801, when the first accumulation of heat off-premises station is operated in refrigeration mode lower time, close the second branch road. According toOpening of the first branch road of the delivery temperature control first accumulation of heat off-premises station of the first accumulation of heat compressor of outdoor unitOff status.
Heat pump comprises that one or one are with the outer machine of the regenerator of appearing on the stage, and the present embodiment holds for firstHot off-premises station carries out exemplary illustration, and wherein the first accumulation of heat off-premises station is the arbitrary accumulation of heat in heat pumpOff-premises station.
The duty of branch road comprises open mode and closed condition. Branch road refers in open mode,Cold-producing medium this branch road of can flowing through, branch road refers in closed condition, cold-producing medium this branch road of can not flowing through.
The structure of the accumulation of heat off-premises station described in conjunction with the embodiments, the first accumulation of heat off-premises station comprisesOne branch road, and may further include the second branch road and the 3rd branch road, by opening or closingOne of them or multiple branch road, control the flow direction of cold-producing medium, to complete difference in functionality,Comprise refrigeration, heat and defrost.
Explanation to refrigerant flow process under refrigeration mode in one in conjunction with the embodiments, when outside the first regeneratorWhen machine comprises the second branch road and the 3rd branch road, under refrigeration mode, the 3rd branch road is in open mode,The second branch road is in closed condition. In the time that reducing compressor exhaust temperature, open by needs the first branch road, whenWhen meeting the demands, delivery temperature can close the first branch road.
Concrete, taking the 4th throttling arrangement as magnetic valve, the feelings that first throttle device is electric expansion valveCondition is example, opens the 4th throttling arrangement in the time that the delivery temperature of compressor is greater than the first delivery temperature, withTime open the first branch road, make cold-producing medium can flow into the first branch road. When delivery temperature is less than second rowWhen temperature is spent, close the 4th throttling arrangement, close the first branch road simultaneously, block refrigerant flows into firstRoad. Optionally, the first delivery temperature can be made as 105 degrees Celsius, and the second delivery temperature can be made as95 degrees Celsius.
802, open the 3rd branch road of the first accumulation of heat off-premises station, regulate according to cold-producing medium degree of supercooling differenceThe flow velocity of cold-producing medium in the first branch road.
Wherein, cold-producing medium degree of supercooling difference, is the cold-producing medium degree of supercooling of the second port of the first branch road,And the difference between the cold-producing medium degree of supercooling of the second port of the 3rd branch road.
In the situation that the 4th throttling arrangement is opened, by the aperture of first throttle device is adjustedJoint, plays the effect that the flow velocity of cold-producing medium in the first branch road is regulated. Wherein, the stream of cold-producing mediumSpeed refers to the refrigerant flow of the branch road of flowing through within the unit interval, specifically can be with flowing through in the unit intervalVolume or the quality etc. of cold-producing medium are weighed.
Concrete, in the time that cold-producing medium degree of supercooling difference is greater than the first degree of supercooling value, increase first throttle dressThe aperture of putting. In the time that cold-producing medium degree of supercooling difference is less than the second degree of supercooling value, reduce first throttle deviceAperture. In the time that cold-producing medium degree of supercooling difference is between the first degree of supercooling value and the second degree of supercooling value, protectThe aperture of holding first throttle device is constant. Optionally, the first degree of supercooling value can be made as 3 degrees Celsius,The second degree of supercooling value can be made as-2 degrees Celsius.
803, when the first accumulation of heat off-premises station is operated in heating mode lower time, open the first accumulation of heat off-premises stationThe 3rd branch road, close the first branch road. According to the switch of delivery temperature control second branch road of compressorState.
Explanation to refrigerant flow process under heating mode in one in conjunction with the embodiments, under heating modeTime, the 3rd branch road is in open mode, and the first branch road is in closed condition. Reduce compressor at needsWhen delivery temperature, open the second branch road, in the time that delivery temperature meets the demands, can close the second branch road.
Concrete, in the time that being greater than the 3rd delivery temperature, the delivery temperature of compressor opens the 4th throttling dressPut, make cold-producing medium can flow into the second branch road. In the time that being less than the 4th delivery temperature, delivery temperature closesThe 4th throttling arrangement, block refrigerant flows into the second branch road. Optionally, the 3rd delivery temperature can be establishedBe 70 degrees Celsius, the 4th delivery temperature can be made as 60 degrees Celsius.
804, regulate the flow velocity of cold-producing medium in the second branch road according to the delivery temperature of compressor.
In the situation that the 4th throttling arrangement is opened, the situation taking the second throttling arrangement as electric expansion valveFor example, by the aperture of the second throttling arrangement is regulated, play cold-producing medium in the second branch roadThe effect that flow velocity regulates.
Concrete, represent the corresponding cold-producing medium saturation temperature of pressure at expulsion with Tc, when compressorWhen the difference of delivery temperature and Tc is greater than the 5th delivery temperature, increase the aperture of the second throttling arrangement.In the time that the delivery temperature of compressor and the difference of Tc are less than the 6th delivery temperature, reduce the second throttling dressThe aperture of putting. When the delivery temperature of compressor and the difference of Tc are in the 5th delivery temperature and the 6th exhaustBetween temperature time, keep the aperture of the second throttling arrangement constant. Optionally, the 5th delivery temperature canBe made as 20 degrees Celsius, the 6th delivery temperature can be made as 15 degrees Celsius.
805, when the first accumulation of heat off-premises station is operated in defrosting mode lower time, close the second branch road and the 3rdBranch road, opens the first branch road.
Explanation to refrigerant flow process under defrosting mode in one in conjunction with the embodiments, under defrosting modeTime, the first branch road is in open mode, and the second branch road and the 3rd branch road are in closed condition.
806, regulate in the first branch road according to the liquid pipe temperature of the outdoor heat exchanger of the first accumulation of heat off-premises stationThe flow velocity of cold-producing medium.
Represent the corresponding cold-producing medium saturation temperature of pressure of inspiration(Pi) with Te, when the liquid pipe of outdoor heat exchangerWhen the difference of temperature and Te is greater than the first liquid pipe temperature, increase the aperture of first throttle device. Work as chamberWhen the liquid pipe temperature of external heat exchanger and the difference of Te are less than the second liquid pipe temperature, reduce first throttle dressThe aperture of putting. When the liquid pipe temperature of outdoor heat exchanger and the difference of Te are the first liquid pipe temperature and secondBetween liquid pipe temperature time, keep the aperture of first throttle device constant. Optionally, the first liquid pipe temperatureCan be made as 60 degrees Celsius, the second liquid pipe temperature can be made as 50 degrees Celsius.
807, when meeting the defrosting mode of closing the first accumulation of heat off-premises station when pre-conditioned.
Wherein, pre-conditioned at least one comprising in following three kinds:
The tracheae temperature of outdoor heat exchanger is greater than preset temperature value.
The exhaust pressure value of compressor the second port is greater than default atmospheric pressure value.
The work duration of the first accumulation of heat off-premises station under defrosting mode exceedes default duration.
For example, in a kind of concrete application scenarios, the tracheae temperature of outdoor heat exchanger is greater than default temperatureWhen degree value, close defrosting mode. Further, be to ensure control stability, at outdoor heat exchangerTracheae temperature is greater than preset temperature value, and when the duration, length exceeded predetermined threshold value, closes defrosting mouldFormula. Concrete, preset temperature value can be made as 12 degrees Celsius, and predetermined threshold value can be made as 5 seconds.
Or the exhaust pressure value of compressor the second port is greater than default atmospheric pressure value, and the durationLength exceedes predetermined threshold value, closes defrosting mode. Concrete, default atmospheric pressure value can be made as 2.9MPa, predetermined threshold value can be made as 20 seconds.
Or, in the time that the work duration of accumulation of heat off-premises station under defrosting mode exceedes default duration, closeDefrosting mode. Concrete, default duration can be 600 seconds.
808, in the situation that heat pump comprises more than one accumulation of heat off-premises station, to more than one accumulation of heatOff-premises station timesharing defrosting.
Timesharing defrosts and refers to, in the situation that heat pump comprises more than one accumulation of heat off-premises station, and Dang YitaiAccumulation of heat off-premises station is operated in defrosting mode lower time, and other accumulation of heat off-premises station in heat pump is all operated in systemUnder heat pattern. Concrete, in the time that the mode of operation of the first accumulation of heat off-premises station is defrosting mode, hold secondThe mode of operation of hot off-premises station is adjusted into heating mode. Wherein, the second accumulation of heat off-premises station is in heat pumpArbitrary accumulation of heat off-premises station except the first accumulation of heat off-premises station.
For example, when N platform indoor set is worked after a period of time under heating mode, outdoor heat exchanger separatelyUpper meeting frosting. Now first the n platform in N platform is switched to defrosting mode, when n platform accumulation of heat off-premises stationMeet while closing defrosting mode pre-conditioned, switch to heating mode, simultaneously by n+1 platform regeneratorOuter machine switches to defrosting mode. Wherein N is greater than 1 integer, and n and n+1 are 0 to N integer.
The control method of the heat pump that embodiments of the invention provide, by accumulation of heat off-premises stationOne branch road, the second branch road and the 3rd branch road open or closed condition is adjusted, refrigeration mouldUnder formula or heating mode, absorb the heat of compressor release and enter by storage heater by radiating moduleRow is stored, thereby has reduced the delivery temperature of compressor. Under refrigeration mode, can improve heat pumpRefrigerating efficiency can prevent overheat of compressor under heating mode. Further, under defrosting modeTime, the heat that utilizes storage heater to reclaim, and the heat of compressor self release, to outdoor heat exchangerDefrost, prevent that accumulation of heat off-premises station interior arrangement is overheated and recycle the two of used heat thereby reachedHeavy effect. When outdoor heat exchanger is defrosted, accumulation of heat off-premises station can continue indoor setHeat supply, can not cause because of defrosting indoor temperature to decline, thereby ensures user's comfortableness. Work as heatWhen pumping system comprises more than one accumulation of heat off-premises station, many accumulation of heat off-premises stations can defrost in turn,When an accumulation of heat off-premises station is operated in defrosting mode lower time, other accumulation of heat off-premises station is operated in heating modeUnder, continue heat supply to indoor set, further ensure user's comfortableness.
Above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited toThis, any be familiar with those skilled in the art the present invention disclose technical scope in, can be easilyExpect changing or replacing, within all should being encompassed in protection scope of the present invention. Therefore, guarantor of the present inventionThe scope of protecting should be as the criterion with the protection domain of claim.
Claims (17)
1. an accumulation of heat off-premises station, is characterized in that, comprising: compressor, outdoor heat exchanger, heat radiationModule and the first branch road;
The first port of described compressor is connected with gas side stop valve, the second port of described compressor and instituteThe first port of stating outdoor heat exchanger connects, the second port of described outdoor heat exchanger and described radiating moduleThe first port connect, the first port company of the second port of described radiating module and described the first branch roadConnect, the second port of described the first branch road is connected with liquid side stop valve;
When described accumulation of heat off-premises station is operated in refrigeration mode lower time, the refrigeration flowing out from described gas side stop valveAgent flows into described compressor by being connected between described compressor and described gas side stop valve;
Cold-producing medium through overcompression flows into by the connection between described compressor and described outdoor heat exchangerDescribed outdoor heat exchanger;
Cold-producing medium flows into described heat radiation by being connected between described outdoor heat exchanger and described radiating moduleModule, described radiating module, for absorbing heat from described compressor, reduces the exhaust temperature of described compressorDegree;
Described the first branch road, for being delivered to the cold-producing medium of the described radiating module of flowing through described liquid side cut-offValve.
2. accumulation of heat off-premises station according to claim 1, is characterized in that,
When described accumulation of heat off-premises station is operated in defrosting mode lower time, described the first branch road is also for will be from describedThe cold-producing medium that liquid side stop valve flows out is delivered to described radiating module.
3. accumulation of heat off-premises station according to claim 1, is characterized in that, described accumulation of heat off-premises stationAlso comprise the 3rd branch road;
The first port of described the 3rd branch road is connected with described liquid side stop valve, second of described the 3rd branch roadPort is connected with the second port of described outdoor heat exchanger.
4. accumulation of heat off-premises station according to claim 3, is characterized in that, described accumulation of heat off-premises stationAlso comprise the second branch road;
The first port of described the second branch road is connected with the second port of described radiating module, described secondSecond port on road is connected with the first port of described outdoor heat exchanger;
Described the second branch road is for being operated in heating mode lower time when described accumulation of heat off-premises station, described in flowing throughThe cold-producing medium of radiating module is carried to described compressor.
5. accumulation of heat off-premises station according to claim 4, is characterized in that, described accumulation of heat off-premises stationAlso comprise storage heater;
The first port of described storage heater is connected with the second port of described radiating module, described storage heaterThe second port is connected with the first port of described the first branch road, and the second port of described storage heater with described inThe first port of the second branch road connects.
6. accumulation of heat off-premises station according to claim 4, is characterized in that,
Described the first branch road comprises first throttle device, and the two ends of described first throttle device are respectively as instituteState the first port of the first branch road and the second port of described the first branch road;
Described the second branch road comprises the second throttling arrangement, and the two ends of described the second throttling arrangement are respectively as instituteState the first port of the second branch road and the second port of described the second branch road;
Described the 3rd branch road comprises the 3rd throttling arrangement, and the two ends of described the 3rd throttling arrangement are respectively as instituteState the first port of the 3rd branch road and the second port of described the 3rd branch road.
7. according to the accumulation of heat off-premises station described in claim 1-6 any one, it is characterized in that, described looseThermal modules comprises: the 4th throttling arrangement and recuperation of heat coil pipe;
The first port of described the 4th throttling arrangement is as the first port of described radiating module, and the described the 4thThe second port of throttling arrangement is connected with the first port of described recuperation of heat coil pipe, described recuperation of heat coil pipeThe second port is as the second port of described radiating module; Described recuperation of heat coil pipe and described compressor are directContact or mediate contact.
8. a heat pump, is characterized in that, comprises accumulation of heat off-premises station and indoor set,
Wherein, described accumulation of heat off-premises station is the accumulation of heat off-premises station described in claim 1-7 any one;
Described indoor set comprises indoor heat exchanger and the 5th throttling arrangement, the first end of described indoor heat exchangerMouthful be connected the second port of described indoor heat exchanger and described Section five with the first port of described indoor setThe second port of stream device connects, second of the first port of described the 5th throttling arrangement and described indoor setPort connects;
The gas side stop valve of described accumulation of heat off-premises station is by the first end of the first branch pipe and described indoor setMouth connects, and the liquid side stop valve of described accumulation of heat off-premises station is by second of the second branch pipe and described indoor setPort connects.
9. heat pump according to claim 8, is characterized in that,
Described heat pump comprises more than one or one accumulation of heat off-premises station.
10. be applied to a control method for heat pump as claimed in claim 8 or 9, its featureBe, comprise:
When the first accumulation of heat off-premises station is operated in refrigeration mode lower time,
Close the second branch road;
According to the first accumulation of heat off-premises station described in the delivery temperature control of described the first accumulation of heat compressor of outdoor unitThe on off state of the first branch road.
11. methods according to claim 10, is characterized in that, described method also comprises:
Open the 3rd branch road of described the first accumulation of heat off-premises station;
Regulate the flow velocity of cold-producing medium in described the first branch road according to cold-producing medium degree of supercooling difference;
Wherein, described cold-producing medium degree of supercooling difference, is the cold-producing medium of the second port of described the first branch roadDegree of supercooling, and difference between the cold-producing medium degree of supercooling of the second port of described the 3rd branch road.
12. methods according to claim 10, is characterized in that, described method also comprises:
When described the first accumulation of heat off-premises station is operated in heating mode lower time,
Open the 3rd branch road of described the first accumulation of heat off-premises station, close the first branch road;
According to the on off state of the second branch road described in the delivery temperature control of described compressor.
13. methods according to claim 12, is characterized in that, described method also comprises:
Regulate the flow velocity of cold-producing medium in described the second branch road according to the delivery temperature of described compressor.
14. methods according to claim 10, is characterized in that, described method also comprises:
When described the first accumulation of heat off-premises station is operated in defrosting mode lower time,
Close described the second branch road and described the 3rd branch road, open described the first branch road.
15. methods according to claim 14, is characterized in that, described method also comprises:
Regulate in described the first branch road and make according to the liquid pipe temperature of the outdoor heat exchanger of the first accumulation of heat off-premises stationThe flow velocity of cryogen.
16. methods according to claim 14, is characterized in that, described method also comprises:
When meeting the defrosting mode of closing described the first accumulation of heat off-premises station when pre-conditioned; Described pre-conditionedComprise following at least one:
The tracheae temperature of described outdoor heat exchanger is greater than preset temperature value;
The exhaust pressure value of described compressor the second port is greater than default atmospheric pressure value;
The work duration of described the first accumulation of heat off-premises station under defrosting mode exceedes default duration.
17. according to the method described in claim 14-16 any one, it is characterized in that, described method alsoComprise:
In the situation that described heat pump comprises more than one accumulation of heat off-premises station,
When described the first accumulation of heat off-premises station is operated in defrosting mode lower time, by the work of the second accumulation of heat off-premises stationMode adjustment is heating mode; Wherein said the second accumulation of heat off-premises station is except described the in described heat pumpArbitrary accumulation of heat off-premises station outside one accumulation of heat off-premises station.
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