CN103423927B - For the Defrost method of air source heat pump system - Google Patents
For the Defrost method of air source heat pump system Download PDFInfo
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- CN103423927B CN103423927B CN201210152219.4A CN201210152219A CN103423927B CN 103423927 B CN103423927 B CN 103423927B CN 201210152219 A CN201210152219 A CN 201210152219A CN 103423927 B CN103423927 B CN 103423927B
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Abstract
The present invention discloses a kind of Defrost method for air source heat pump system, comprises the following steps: S101, judges whether air source heat pump system meets the condition of the heat-accumulating process that defrosts; S103 enters defrosting heat-accumulating process in the time that air source heat pump system meets the condition of the heat-accumulating process that defrosts; S105, judges that whether air source heat pump system meets the condition of the heat-accumulating process that stops defrosting; S107, in the time that air source heat pump system meets the condition of the heat-accumulating process that stops defrosting, defrosting heat-accumulating process stops; S109, air source heat pump system enters defrost process. According to the Defrost method for air source heat pump system of the present invention, can reduce liquid refrigerant in defrost process and, to the capacity of returns of low-pressure side, also can make the liquid refrigerant refluxing evaporate quickly, the front high-pressure side parts that make to defrost store more heat. Can also accelerate the speed heating again after defrosting finishes, and contribute to the normal operation of compressor.
Description
Technical field
The present invention relates to air source heat pump system technical field, relate in particular to a kind of for air source heat pumpThe Defrost method of system.
Background technology
Air source heat pump system absorbs low-grade heat energy in the time heating from outdoor environment, then by heatAmount is transported to indoor, meets people and warms oneself in the winter time, and use the demands such as hot water. When heat exchanger tableSurface temperature is during lower than 0 DEG C, and airborne moisture will condense into frost at heat exchanger surface, formsFrost layer not only affects heat transfer, also can make the flow area of air diminish, and increases air drag, even makesThe passage of circulation of air blocks completely, causes the air source heat pump system cannot continuous heating. Therefore, skyWhen air supply heat pump system is used in the winter time, it is a very important link that defrosting is controlled. At present,Conventional Defrost method has two kinds of electric heated defrosting and hot gas reverse cycle defrosts.
Paper electric heated defrosting. So-called electric heated defrosting refers to by air source heat pump systemOff-premises station heat-exchanger surface is arranged some electric heaters, when the surperficial frosting of off-premises station heat exchangerMainly with when having influence on carrying out continuously of normally heating, by melting to electric heater heating powerThe frost layer of off-premises station heat-exchanger surface is to ensure that heat pump moves continuously. Electric heated defrosting mainShortcoming is that energy consumption is higher, and its defrosting effect is also very limited.
Next the hot gas reverse cycle defrost that will introduce is that most air source heat pump system adoptsDefrost method. See figures.1.and.2, the method for this hot gas defrosting refers to by four-way change-over valve 1Change the flow direction of cold-producing medium, heat under state will be originally from compressor 2 discharged to heat exchanger indoor unit3 high-temperature gas commutates by four-way change-over valve 1, makes it flow into off-premises station heat exchanger 4, by thisA little high-temperature gases heat off-premises station heat exchanger 4, thereby make to condense in outside off-premises station heat exchanger 4The frost on surface melts, the object defrosting to reach off-premises station heat exchanger 4.
Adopting in the air source heat pump system of hot gas reverse cycle defrost, when air source heat pump system is in figureIn lower time of the state that heats shown in 1,, the control system of air source heat pump system is by gathering air-conditioning systemThe signal parameter such as temperature, pressure, through calculating, judging, determines whether to enter defrosting running and controls.If control system determines that need to enter defrosting running controls, and sends action letter to four-way change-over valve 1Number, four-way change-over valve 1 commutates after receiving and entering defrosting actuating signal immediately, and air source heat pump system entersEnter the defrost state shown in Fig. 2. Now, the cold-producing medium that compressor 2 is discharged flows directly into the chamber of frostingOuter machine heat exchanger 4, the heat of the high-temperature gas of discharging by compressor 2 melts off-premises station heat to be handed overThe frost on parallel operation 4 surfaces. In order to reach better defrosting effect, reduce the loss of heat, accelerate defrostingSpeed, off-premises station blower fan 5 is stopped running during defrosting. Cold-producing medium is at off-premises station heat exchangerIn 4, release heat is condensed into liquid for melting the frost of heat exchanger surface, these refrigerant liquid streamsEnter heat exchanger indoor unit 3, after the throttling of indoor set throttle part, at heat exchanger indoor unit 3Airborne heat in middle absorption chamber and evaporating, this process can reduce indoor environment temperature. Therefore,In order to prevent having cold wind to blow out during defrosting, current existing way is during defrosting in close chamberMachine blower fan 6 reduces because of the defrost problem of the degree of comfort decreased of bringing of system. From indoor set heat exchangeThe cold-producing medium that device 3 flows out is got back to compressor 2 through air intake duct, has so just completed a cold-producing medium and has removedCirculation in frost process. When meeting after the condition that exits defrosting running, four-way change-over valve 1 moves again,Exit defrosting running, air source heat pump system has completed defrost cycle one time, reenters and heatsRunning.
The shortcoming of the method for this hot gas reverse cycle defrost is to change because of four-way change-over valve 1 during defrostingTo too fast, cause the liquid refrigerant that large amount temperature is lower to be back to low-pressure side, be difficult at short notice, also may there is defrosting time prolongation or low-voltage variation and the situation that cannot thoroughly defrost in evaporation. SimultaneouslyThe large lower liquid refrigerant of amount temperature is back in gas-liquid separator and compressor 2, has diluted compressionLubricating oil in machine 2, causes the bearing of compressor 2 and the lubricated and parts of other mechanical moving elementsSealing property reduce, thereby strengthened the compressor 2 even risk of damage of wearing and tearing.
Therefore, need a kind of capacity of returns that can reduce liquid refrigerant during defrosting for airThe Defrost method of source heat pump system.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides one and for air source heat pump beThe Defrost method of system, comprises the following steps: S101, judges whether described air source heat pump system meetsThe condition of heat-accumulating process defrosts; S103, holds when described air source heat pump system meets to defrostWhen the condition of thermal process, described air source heat pump system enters defrosting heat-accumulating process, is defrost process storageDeposit heat; S105, judges that whether described air source heat pump system meets the bar of the heat-accumulating process that stops defrostingPart; S107, in the time that described air source heat pump system meets the condition of the heat-accumulating process that stops defrosting, defrostingHeat-accumulating process stops; S109, described air source heat pump system enters defrost process.
Preferably, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLLower than described skyThe temperature threshold T of the described off-premises station liquid pipe that air supply heat pump system sets in advanceL0Time, described air-sourceHeat pump enters defrosting heat-accumulating process.
Preferably, when described air source heat pump system enters defrosting heat-accumulating process, the temperature of refrigerant inletDegree value TRIThe temperature threshold of the described refrigerant inlet setting in advance lower than described air source heat pump systemTRI0The indoor set of described air source heat pump system carry out accumulation of heat action.
Preferably, when described air source heat pump system enters defrosting heat-accumulating process, described air source heat pumpWhole indoor sets of system are carried out accumulation of heat action simultaneously.
Preferably, it is many indoor sets that thermally operated described indoor set is held in execution, described many indoor setsSimultaneously or enter successively respectively defrosting heat-accumulating process and carry out accumulation of heat action.
Preferably, described accumulation of heat action comprises the heat exchanger indoor unit suction of described air source heat pump systemReceive the heat of the high-temperature high-pressure refrigerant gas of discharging from compressor, and described heat is stored in to instituteState in heat exchanger indoor unit.
Preferably, described indoor set enters defrosting heat-accumulating process and carries out after accumulation of heat action, described in closingIndoor set blower fan or reduce the rotating speed of described indoor set blower fan, and regulate the electronic expansion of indoor unitsThe aperture of valve.
Preferably, the aperture of described electric expansion valve can be maximum opening 10%～100% betweenCertain fixing aperture, or change and regulate according to the parameter of described air source heat pump system.
Preferably, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLHigher than described skyThe upper limit threshold T of the temperature of the predefined described off-premises station liquid pipe of air supply heat pump systemL1Time, described inDefrosting heat-accumulating process stops, and carries out described step S109.
Preferably, when the pressure value P of the pressure at expulsion of the compressor of described air source heat pump systemDHigher thanThe upper limit threshold P of the pressure at expulsion of the predefined described compressor of described air source heat pump systemD0Time, described defrosting heat-accumulating process stops, and carries out described step S109.
Preferably, when the duration of described defrosting heat-accumulating process, to exceed described air source heat pump system pre-The upper limit threshold t of the defrosting accumulation of heat duration of first settingshTime, described defrosting heat-accumulating process stops, and entersThe described step S109 of row.
Preferably, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLGreater than or equal toThe temperature threshold T of the predefined described off-premises station liquid pipe of described air source heat pump systemL0Time, carry outDescribed step S109.
Preferably, when described air source heat pump system does not meet the condition that stops described defrosting heat-accumulating processTime, repeating said steps S103 and described step S105.
Preferably, when described air source heat pump system enters after defrost process, described air source heat pump isThe compressor of outdoor unit of system first suspends tpAfter minute, restart four-way change-over valve commutation, off-premises station blower fanShut down with whole indoor set blower fans, all the aperture of the electric expansion valve of indoor set is joined according to systemNumber variation and regulate.
Preferably, this Defrost method also comprises step S111, whether judges described air source heat pump systemMeet the condition that stops defrost process.
Preferably, this Defrost method also comprises step S113, stops when described air source heat pump system meetsWhile stopping the condition of described defrost process, described defrost process stops, and described air source heat pump system entersHeat process.
Preferably, the temperature T exporting when the outdoor calorimetric exchange of described air source heat pump systemODCLHighThe threshold value of the temperature exporting in the predefined described outdoor calorimetric exchange of described air source heat pump systemTODCL11Time, described defrost process stops, and described air source heat pump system enters the process of heating.
Preferably, as the pressure at expulsion P of the compressor of described air source heat pump systemDHigher than described airThe threshold value P of the pressure at expulsion of the predefined described compressor of source heat pump systemD1Time, described defrostingJourney stops, and described air source heat pump system enters the process of heating.
Preferably, when the duration of described defrost process exceedes described air source heat pump system and establishes in advanceWhen fixed time upper limit, described defrost process stops, and described air source heat pump system enters the process of heating.
Preferably, when described air source heat pump system does not meet while stopping the condition of described defrost process,Repeating said steps S109.
Preferably, before described step S101, also comprise normal heating process, described air source heat pumpThe temperature and pressure of the monitoring control devices system of the off-premises station of system, when described air source heat pump systemThe outlet temperature T of off-premises station heat exchangerODCLLower than the predefined described chamber of air source heat pump systemThe threshold value T of the outlet temperature of outer machine heat exchangerODCL0, and TODCL<TODCL0State continuance establishFix time more than t, described outdoor controller sends defrosting signal to described air source heat pump system.
According to the Defrost method for air source heat pump system of the present invention, be provided with defrosting accumulation of heatJourney was first defrost process storage by defrosting heat-accumulating process before air source heat pump system enters defrost processDeposit heat. So just can reduce air source heat pump system in defrost process liquid refrigerant to low pressureThe capacity of returns of side, also can make the liquid refrigerant refluxing carry more heat and evaporation quickly,Make the to defrost more heat of storage of front high-pressure side parts, is conducive to defrost quickly. Meanwhile, can alsoEnough quickening after defrosting finishes restarted the speed heating, and improved the comfort level heating. And contribute toThe normal operation of compressor, has ensured stablizing and reliability service of air source heat pump system, has improved and has removedThe efficiency of frost efficiency and whole air source heat pump system.
The concept of having introduced a series of reduced forms in summary of the invention part, this will be in specific embodiment partyIn formula part, further describe. Content part of the present invention and do not mean that to attempt to limit wantAsk key feature and the essential features of the technical scheme of protection, more do not mean that and attempt definite wantingAsk the protection domain of the technical scheme of protection.
Below in conjunction with accompanying drawing, describe advantages and features of the invention in detail.
Brief description of the drawings
Fig. 1 is that air source heat pump system is at the flow direction that heats cold-producing medium under state;
Fig. 2 is the flow direction of air source heat pump system cold-producing medium under defrost state;
Fig. 3 is the flow chart of the Defrost method for air source heat pump system of the present invention;
Fig. 4 is the system composition diagram of air source heat pump system;
Fig. 5 is the thermal storage defrosting sequential chart of air source heat pump system of the present invention.
Detailed description of the invention
In the following description, a large amount of concrete details have been provided to provide more thorough to the present inventionUnderstanding. But, it will be apparent to one skilled in the art that the present invention can be withoutOne or more these details and being implemented. In other example, for fear of sending out with the present inventionLife is obscured, and is not described for technical characterictics more well known in the art.
In order thoroughly to understand the present invention, will detailed structure be proposed in following description. Obviously, originallyThe execution of invention is not limited to the specific details that those skilled in the art has the knack of. Of the present inventionGood embodiment is described in detail as follows, but except these are described in detail, the present invention can also have itHis embodiment.
The invention discloses a kind of Defrost method for air source heat pump system, its flow chart is as Fig. 3Shown in, Fig. 4 shows the system composition of air source heat pump system, below in conjunction with Fig. 3 and Fig. 4 coupleDefrost method for air source heat pump system provided by the invention describes.
As shown in Figure 4, air source heat pump system mainly comprises off-premises station 10 and indoor units 30, chamberOuter machine 10 should be at least one, and indoor units 30 can comprise multiple indoor sets 31. When air-source heatPumping system is in heating process time, and the controller of off-premises station 10 is carrying out temperature and pressure in real timeMonitoring, is step S101, judges whether air source heat pump system meets the bar of the heat-accumulating process that defrostsPart provides foundation. And carrying out before step S101, can also comprise normal heating process, in this mistakeCheng Zhong, the states such as the temperature and pressure of the monitoring control devices system of the off-premises station 10 of air source heat pump systemParameter, as the outlet temperature T of the off-premises station heat exchanger 14 of air source heat pump systemODCLLower than airThe threshold value T of the outlet temperature of the predefined described off-premises station heat exchanger 14 of source heat pump systemODCL0，And TODCL<TODCL0State continuance setting-up time t more than, the controller of off-premises station 10 is to skyAir supply heat pump system is sent defrosting signal. When air source heat pump system meets the heat-accumulating process of defrostingWhen condition, the off-premises station liquid pipe that the off-premises station liquid pipe temperature sensor 91 of off-premises station 10 detectsTemperature value TLThe temperature threshold T of the off-premises station liquid pipe setting in advance lower than air source heat pump systemL0, thisShi Jinhang step S103, air source heat pump system starts to enter defrosting heat-accumulating process, removes for ensuingFrost process store heat. The sequential chart of each parts in air source heat pump system in the time carrying out accumulation of heat actionAs shown in Figure 5. Enter after defrosting heat-accumulating process, according to refrigerant inlet temperature at air source heat pump systemThe temperature value T of the refrigerant inlet that degree sensor 92 detectsRISet in advance with air source heat pump systemThe temperature threshold T of refrigerant inletRI0Comparative result to determine how indoor set 31 carries out accumulation of heat movingDo to reach the object of store heat, and only have the temperature value T of those refrigerant inletRILower than skyThe temperature threshold T of the refrigerant inlet that air supply heat pump system sets in advanceRI0Indoor set 31 just carry outAccumulation of heat action. Thermally operated indoor set 31 is held in execution can be one or many, also can be manyThe indoor units 30 that indoor set 31 forms. In the middle of this, many execution had both been held thermally operated indoor set 31Can carry out accumulation of heat action simultaneously, also can enter successively respectively defrosting heat-accumulating process, carry out accumulation of heat movingDo. Concrete accumulation of heat action comprises that heat exchanger indoor unit 33 absorbs the height of discharging from compressor 11The heat of temperature higher pressure refrigerant gas, and these heats are stored in to the pipe of heat exchanger indoor unit 33In the parts such as road, aluminium foil fin and valve body.
In the time carrying out above-mentioned accumulation of heat action, operating condition when off-premises station 10 still keeps normally heating,The refrigerant gas of the HTHP of being discharged by compressor 11 is by the a-d passage of four-way change-over valve 12Enter every indoor set 31 through the tracheae 50 that connects off-premises station 10 and indoor units 30, and at everyRelease heat in the heat exchanger indoor unit 33 of indoor set 31. Particularly, these heats are all storedIn the parts such as pipeline, aluminium foil fin and the valve body of heat exchanger indoor unit 33, for follow-up removingFrost process. After refrigerant gas releases heat, be condensed into liquid refrigerant, liquid refrigerant is by connectingThe liquid pipe 70 that connects off-premises station 10 and indoor units 30 flows back to off-premises station heat exchanger 14, then through four-wayThe b-c passage of reversal valve 12 is finally got back to the low pressure air suction side of the compressor 11 of off-premises station 10. RefrigerationAgent gas, through such circulation, constantly provides heat to heat exchanger indoor unit 33. And indoorMachine 31 enters defrosting heat-accumulating process and carries out after accumulation of heat action, closes indoor set blower fan 34 or reducesThe rotating speed of indoor set blower fan 34, and the aperture of the electric expansion valve 32 of adjusting indoor units 30. RightThe aperture of electric expansion valve 32 can at 10% of maximum opening, to value in 100% scope, certain be openedDegree, or regulate according to the parameter transformation of air source heat pump system, the parameter of mentioning is here mainRefer to TRIWith TRI0Difference, so just can be sooner, more effectively heat is stored in to indoor setIn heat exchanger 33.
Along with the carrying out of above-mentioned defrosting heat-accumulating process, off-premises station liquid pipe temperature sensor 91 can detect chamberThe temperature value T of outer machine liquid pipeLConstantly raise, when its temperature predefined higher than air source heat pump systemThe upper limit threshold T of the temperature of off-premises station liquid pipeL1Time the heat-accumulating process that defrosts stop, air source heat pump systemExit defrosting heat-accumulating process, start immediately to carry out step S109, air source heat pump system enters and defrostedJourney.
Except passing through TLWith TL1Relatively judge whether air source heat pump system meets and stop defrosting and holdOutside the condition of thermal process, can also be by the pressure value P of the pressure at expulsion of compressor 11DWith air-sourceThe upper limit threshold P of the pressure at expulsion of the predefined compressor 11 of heat pumpD0Comparison, and removeThe duration of frost heat-accumulating process and predefined defrosting accumulation of heat duration of air source heat pump systemUpper limit threshold tshRelatively judge. Work as PDHigher than PD0Time, or holding when defrosting heat-accumulating processThe continuous time exceedes tshTime, air source heat pump system exits defrosting heat-accumulating process, starts immediately to carry out stepS109, air source heat pump system enters defrost process.
In the time that air source heat pump system does not meet the condition of the heat-accumulating process that stops defrosting, by repeating stepWhether S103 and step S105, judge air source heat pump system in the heat-accumulating process that defrostsMeet the condition of the heat-accumulating process that stops defrosting.
In addition, air source heat pump system can also directly defrost without defrosting heat-accumulating processJourney. Work as the temperature value T of the off-premises station liquid pipe of air source heat pump systemLGreater than or equal to air source heat pumpThe temperature threshold T of the predefined off-premises station liquid of system pipeL0Time, air source heat pump system will directly enterRow step S109, starts defrost process.
When air source heat pump system enters after defrost process, the compressor 11 of off-premises station 10 first suspends tpMinute time, restart after conventionally suspending about 1 minute; Four-way change-over valve 12 commutates, and makes aWith b conducting, c and d conducting; Off-premises station blower fan 13 and indoor set blower fan 34 shut down; AllThe aperture of the electric expansion valve 32 of indoor set 31 regulates according to the variation of systematic parameter.
Air source heat pump in the time carrying out defrost process, the cold-producing medium gas of the HTHP that compressor 11 is dischargedBody enters condensation in off-premises station heat exchanger 14 by the a-b passage of four-way change-over valve 12 and discharges heatAmount, is heated the coil pipe of off-premises station heat exchanger 14 and fin, will be attached to the frost on its surfaceMelt. After refrigerant gas is condensed through connecting the liquid pipe 70 of off-premises station 10 and indoor units 30Enter into the heat exchanger indoor unit 33 of each indoor set 31 of indoor units 30. Due to indoorMachine heat exchanger 33 has stored enough heats in defrosting heat-accumulating process before, even therefore in chamberIn the situation that interior machine blower fan 34 shuts down, also can rely on these heats that previously stored to meet greatlyAmount liquid refrigerant evaporates required heat energy. These liquid refrigerants absorb the heat storing in advance and steamSend out as refrigerant gas, and collect in the tracheae 50 that connects off-premises station 10 and indoor units 30, logicalThe d-c passage of crossing four-way change-over valve 12, enters in gas-liquid separator 15, and finally gets back to compressor11 low pressure air suction side, like this, air source heat pump system has just completed the complete of a defrost process and has followedRing.
Because a large amount of liquid refrigerants absorbs heat and is evaporated to gas in each heat exchanger indoor unit 33,Therefore, effectively reduce the capacity of returns of liquid refrigerant, thereby solved the deposition of liquid refrigerantPhenomenon, and then improved heating effect and running efficiency. Meanwhile, due to during having reduced defrostingFlow into suction side without the liquid refrigerant of fully evaporation in a large number, therefore reduced because of liquid state systemCryogen flows into compressor 11 and the risk that causes compressor 11 to damage or burn. And, liquid refrigerationThe minimizing of the capacity of returns of agent has also solved the problem that the too low triggering system low-voltage variation of pressure of inspiration(Pi) is shut down.
The same with defrosting heat-accumulating process, air source heat pump system also can be supervised at any time in the time carrying out defrost processThe parameters of examining system judges to carry out step S113 whether system meets the bar that stops defrost processPart. When air source heat pump system does not meet while stopping the condition of defrost process, return to step S109Proceed defrost process. When air source heat pump system meets while stopping the condition of defrost process, defrostingProcess stops, and system restarts to heat. Here the satisfied condition that stops defrost process of mentioning is mainThere are following three.
The temperature T of the outdoor calorimetric exchange outlet of first air source heat pump systemODCLHigher than air-sourceThe threshold value T of the temperature of the predefined outdoor calorimetric exchange outlet of heat pumpODCL11; It two is airThe pressure at expulsion P of the compressor of source heat pump systemDHigher than the predefined compression of air source heat pump systemThe threshold value P of the pressure at expulsion of machineD1; The 3rd is to exceed duration of defrost process air source heat pump systemThe predefined time upper limit of uniting. These three conditions meet one of them can make air source heat pump systemStop defrost process, and restart to heat.
In sum, the Defrost method for air source heat pump system provided by the invention removes because being provided withFrost heat-accumulating process, before air source heat pump system enters defrost process first by defrosting heat-accumulating process for removingFrost process store heat. So just can reduce air source heat pump system liquid refrigeration in defrost processAgent is to the capacity of returns of low-pressure side, and the liquid refrigerant that also can make to reflux carries more heat and fasterGround evaporation, the more heat of storage of the front high-pressure side parts that make to defrost, is conducive to defrost quickly. WithTime, can also accelerate after defrosting finishes to restart the speed heating, improve the comfort level heating. AndAnd contribute to the normal operation of compressor, ensured the stable and reliability service of air source heat pump system,Improve the efficiency of defrosting efficiency and whole air source heat pump system.
The present invention is illustrated by above-described embodiment, but should be understood that, above-mentioned enforcementExample is the object for giving an example and illustrating just, but not is intended to the present invention to be limited to described embodimentIn scope. In addition it will be appreciated by persons skilled in the art that the present invention is not limited to above-mentioned enforcementExample, can also make more kinds of variants and modifications according to instruction of the present invention, these variants and modificationsAll drop in the present invention's scope required for protection. Protection scope of the present invention is wanted by attached rightAsk book and equivalent scope thereof to define.
Claims (19)
1. for a Defrost method for air source heat pump system, it is characterized in that, comprise the following steps:
S101, judges whether described air source heat pump system meets the condition of the heat-accumulating process that defrosts;
S103, in the time that described air source heat pump system meets the condition of the heat-accumulating process that defrosts, described air source heat pump system enters defrosting heat-accumulating process, is defrost process store heat;
S105, judges that whether described air source heat pump system meets the condition of the heat-accumulating process that stops defrosting;
S107, in the time that described air source heat pump system meets the condition of the heat-accumulating process that stops defrosting, defrosting heat-accumulating process stops;
S109, described air source heat pump system enters defrost process;
Described air source heat pump system enters defrosting heat-accumulating process, and the temperature value T of refrigerant inletRIThe temperature threshold T of the described refrigerant inlet setting in advance lower than described air source heat pump systemRI0Time, the indoor set of described air source heat pump system is carried out accumulation of heat action;
Described accumulation of heat action comprises that the heat exchanger indoor unit of described air source heat pump system absorbs the heat of the high-temperature high-pressure refrigerant gas of discharging from compressor, and described heat is stored in described heat exchanger indoor unit.
2. according to Defrost method claimed in claim 1, it is characterized in that, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLThe temperature threshold T of the described off-premises station liquid pipe setting in advance lower than described air source heat pump systemL0Time, described air source heat pump system enters defrosting heat-accumulating process.
3. according to Defrost method claimed in claim 2, it is characterized in that, when described air source heat pump system enters defrosting heat-accumulating process, whole indoor sets of described air source heat pump system are carried out accumulation of heat action simultaneously.
4. according to Defrost method claimed in claim 1, it is characterized in that, carry out that to hold thermally operated described indoor set be many indoor sets, described many indoor sets simultaneously or enter successively respectively defrosting heat-accumulating process and carry out accumulation of heat action.
5. according to the Defrost method described in claim 1 or 3, it is characterized in that, after described indoor set enters defrosting heat-accumulating process and carries out accumulation of heat action, close described indoor set blower fan or reduce the rotating speed of described indoor set blower fan, and regulate the aperture of the electric expansion valve of indoor units.
6. according to Defrost method claimed in claim 5, it is characterized in that, certain fixing aperture that the aperture of described electric expansion valve is maximum opening between 10%～100%, or change and regulate according to the parameter of described air source heat pump system.
7. according to Defrost method claimed in claim 1, it is characterized in that, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLHigher than the upper limit threshold T of the temperature of the predefined described off-premises station liquid pipe of described air source heat pump systemL1Time, described defrosting heat-accumulating process stops, and carries out described step S109.
8. according to Defrost method claimed in claim 1, it is characterized in that, when the pressure value P of the pressure at expulsion of the compressor of described air source heat pump systemDHigher than the upper limit threshold P of the pressure at expulsion of the predefined described compressor of described air source heat pump systemD0Time, described defrosting heat-accumulating process stops, and carries out described step S109.
9. according to Defrost method claimed in claim 1, it is characterized in that, exceed the upper limit threshold t of predefined defrosting accumulation of heat duration of described air source heat pump system when the duration of described defrosting heat-accumulating processshTime, described defrosting heat-accumulating process stops, and carries out described step S109.
10. according to Defrost method claimed in claim 1, it is characterized in that, as the temperature value T of the off-premises station liquid pipe of described air source heat pump systemLGreater than or equal to the temperature threshold T of the predefined described off-premises station liquid pipe of described air source heat pump systemL0Time, carry out described step S109.
11. according to Defrost method claimed in claim 1, it is characterized in that, and when described air source heat pump system does not meet while stopping the condition of described defrosting heat-accumulating process, repeating said steps S103 and described step S105.
12. according to Defrost method claimed in claim 1, it is characterized in that, when described air source heat pump system enters after defrost process, the compressor of outdoor unit of described air source heat pump system first suspends tpAfter minute, restart, four-way change-over valve commutation, off-premises station blower fan and all indoor set blower fan shut down, and all the aperture of the electric expansion valve of indoor set regulates according to the variation of systematic parameter.
13. according to Defrost method claimed in claim 1, it is characterized in that, also comprises step S111, judges whether described air source heat pump system meets the condition that stops defrost process.
14. according to the Defrost method described in claim 13, it is characterized in that, also comprises step S113, and when described air source heat pump system meets while stopping the condition of described defrost process, described defrost process stops, and described air source heat pump system enters the process of heating.
15. according to the Defrost method described in claim 14, it is characterized in that, when the temperature T of the outside of described air source heat pump system heat exchange outletODCLThe threshold value T of the temperature exporting higher than the heat exchange of the predefined described outside of described air source heat pump systemODCL11Time, described defrost process stops, and described air source heat pump system enters the process of heating.
16. according to the Defrost method described in claim 14, it is characterized in that, as the pressure at expulsion P of the compressor of described air source heat pump systemDHigher than the threshold value P of the pressure at expulsion of the predefined described compressor of described air source heat pump systemD1Time, described defrost process stops, and described air source heat pump system enters the process of heating.
17. according to the Defrost method described in claim 14, it is characterized in that, in the time that the duration of described defrost process exceedes the predefined time upper limit of described air source heat pump system, described defrost process stops, and described air source heat pump system enters the process of heating.
18. according to the Defrost method described in claim 13, it is characterized in that, and when described air source heat pump system does not meet while stopping the condition of described defrost process, repeating said steps S109.
19. according to Defrost method claimed in claim 1, it is characterized in that, before described step S101, also comprise normal heating process, the temperature and pressure of the monitoring control devices system of the off-premises station of described air source heat pump system, as the outlet temperature T of the off-premises station heat exchanger of described air source heat pump systemODCLLower than the threshold value T of the outlet temperature of the predefined described off-premises station heat exchanger of air source heat pump systemODCL0, and TODCL<TODCL0State continuance setting-up time t more than, described outdoor controller sends defrosting signal to described air source heat pump system.
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| CN105588222A (en) * | 2015-06-16 | 2016-05-18 | 青岛海信日立空调系统有限公司 | Outdoor unit, multi-connected heat pump system and control method thereof |
| CN107036347A (en) * | 2017-04-25 | 2017-08-11 | 广东海悟科技有限公司 | Can intelligent defrosting heat pump air conditioner, the computer-readable recording medium of heat pump air conditioner |
| CN110220264A (en) * | 2018-03-02 | 2019-09-10 | 浙江盾安机电科技有限公司 | Air-conditioner set and its heat exchanger surface processing method |
| CN110701747B (en) * | 2019-09-26 | 2020-10-27 | 珠海格力电器股份有限公司 | Control method of air conditioning system |
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Address after: Tokyo, Japan Patentee after: HITACHI-JOHNSON CONTROLS AIR CONDITIONING, Inc. Address before: Tokyo, Japan Patentee before: Hitachi Johnson Automatic Air Conditioning Co.,Ltd. |
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Effective date of registration: 20181218 Address after: Tokyo, Japan Patentee after: Hitachi Johnson Automatic Air Conditioning Co.,Ltd. Address before: 511685 Xuetian Management Zone, Longshan Town, Fogang County, Qingyuan City, Guangdong Province Patentee before: YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION Co.,Ltd. Effective date of registration: 20181218 Address after: Longtian Town, Fogang County, Qingyuan, Guangdong Patentee after: YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION Co.,Ltd. Address before: 511685 Xuetian Management Zone, Longshan Town, Fogang County, Qingyuan City, Guangdong Province Co-patentee before: JOHNSON CONTROLS TECHNOLOGY Co. Patentee before: YORK GUANGZHOU AIR CONDITIONING AND REFRIGERATION Co.,Ltd. |