CN104344619A - Double-system heat pump defrosting method and device - Google Patents

Double-system heat pump defrosting method and device Download PDF

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Publication number
CN104344619A
CN104344619A CN201310340029.XA CN201310340029A CN104344619A CN 104344619 A CN104344619 A CN 104344619A CN 201310340029 A CN201310340029 A CN 201310340029A CN 104344619 A CN104344619 A CN 104344619A
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CN
China
Prior art keywords
defrosting
loop
heat
temperature
evaporator fin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310340029.XA
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Chinese (zh)
Inventor
曹辉
刘军
冯俊乐
徐春堂
师莉丽
程利平
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LUOYANG ZHONGMAO ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Original Assignee
LUOYANG ZHONGMAO ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
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Application filed by LUOYANG ZHONGMAO ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd filed Critical LUOYANG ZHONGMAO ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Priority to CN201310340029.XA priority Critical patent/CN104344619A/en
Publication of CN104344619A publication Critical patent/CN104344619A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles

Abstract

The invention discloses a double-system heat pump defrosting method and a double-system heat pump defrosting device. Two sets of defrosting mechanisms are arranged, when the temperature of evaporator fins is continuously lower than 0 DEG C and the ambient temperature is higher than 5 DEG C and lower than 10 DEG C, a fin evaporator 9a or 9b stops working in a heating loop and enters into a natural defrosting mode; when the temperature of the evaporator fins is continuously lower than 0 DEG C and the ambient temperature is lower than 5 DEG C, the fin evaporator 9a or 9b enters into a hot air defrosting mode, defrosting heat is provided for the defrosted fin evaporator (9a/9b) from high-temperature air discharged from a compressor (1b/1a) in another loop, and the defrosted fin evaporator (9a/9b) stops working in the heating loop. The phenomena of pause protection and liquid compression caused when an evaporator is defrosted are avoided, and the purposes that the energy is saved, the consumption is reduced, the cost is reduced, the defrosting time is shortened, and the operation is safe, stable and reliable when the ambient environment is lower than 0 DEG C are achieved. The defrosting time is only 1/4 of that of a conventional defrosting mode.

Description

Dual system Defrost method and device
Technical field
The technology of the present invention relates to air source heat pump defrosting technical field, and what relate generally to is dual system Defrost method and device, is applicable to all air-source dual system Teat pump boilers.
Background technology
Known air source hot pump water heater runs at low ambient temperatures and heats, when evaporator surface temperature is lower than air dew point temperature and when being less than 0 DEG C, evaporator surface will frosting.The frosting initial stage, because frosting adds roughness and the surface area of heating surface, total heat transfer coefficient is increased to some extent, but along with the progressive additive of frost layer, the resistance that air flows through finned tube increases, air mass flow reduces, and causes finned tube inner refrigerant to evaporate insufficient, and evaporating temperature reduces, the evaporator outlet degree of superheat reduces, refrigerant flow reduces, and heating capacity is decayed, and causes compressor fault time serious.Therefore, heat pump normal, stable operation at low ambient temperatures be ensured, the defrosting problem of evaporimeter must be considered.At present, the Defrost mode that air source hot pump water heater is the most frequently used has three kinds: defrosting, reverse cycle defrosting, hot gas bypass defrosting naturally.
Naturally defrost: higher than in 0 DEG C of environment temperature, the certain hour out of service when system needs defrosting, utilizes the heat in surrounding environment, makes evaporator temperature return to more than 0 DEG C, melted in the frost layer of evaporator surface by knot, this is the simplest method of one.After defrosting terminates, restart heating and carry out work.The maximum advantage of this Defrost mode is that method is simple, and does not consume extra energy.But this Defrost mode exists certain defect, the longer then thermal loss of defrosting time is more, causes heat pump heating efficiency to decline.The evaporimeter of air source hot pump water heater is placed as master mainly with outdoor, and in northern temperature lower ground district, winter temperature can arrive less than 0 DEG C mostly, and this kind of mode cannot be adopted to defrost.
Reverse cycle defrosting: when system needs defrosting, being changed the flow direction of cold-producing medium by four-way change-over valve, making unit become kind of refrigeration cycle from heating circulation, blower fan quits work simultaneously, and the high-temperature gas that compressor is discharged enters finned heat exchanger and carries out defrost.In the defrost process of defrost cycle; unit absorbs heat and is provided to finned heat exchanger removal frost from water system; the heat that unit produces is negative; the quantity of the positive heat that the quantity bearing heat produces within the same time with unit is roughly the same; so from energy point of view; the loss of this defrost process is equivalent to the shutdown of twice defrosting time, makes the heating load of unit decline about 10%.In addition, cross valve frequently commutates can affect its life and reliability.
Hot gas bypass defrosting: this Defrost method does not change the flow direction of cold-producing medium, it is constant that unit keeps heating duty in defrost process, and in a refrigerating circuit, the direct bypass part of the high-temperature gas of being discharged by compressor carries out defrosting to evaporator fin.This Defrost mode, because high-pressure side refrigerant liberated heat still comes from the heat of evaporimeter absorption, when environment temperature is lower, when defrosting speed is fast not, will have enough heat absorption, heat pump main frame generation protectiveness can be made to shut down.As adopted simple bypass, the whole bypass of high-temperature gas of discharging by compressor carries out rapid frost melting to evaporator fin, gas coolant release heat rear section is converted into highly pressurised liquid, the moment of heating mode is switched at defrosting mode, this part highly pressurised liquid very easily enters compressor by system pipeline, compressor is made to occur hydraulic compression phenomenon, reduce the security of system, refrigerant heater can be installed between evaporator fin and compressor for solving this kind of hidden danger, this device only runs when defrosting mode, thus efficiently avoid the liquid coolant after defrosting and directly enter compressor, but the use of refrigerant heater adds manufacturing cost and the defrosting cost of system.
Summary of the invention
The object of the invention is the deficiency existed for above-mentioned several Defrost mode, propose a kind of dual system Defrost method and device.The stoppage protection caused when solving existing evaporator defrost and hydraulic compression phenomenon, reach energy-saving and cost-reducing, reduce costs, and shortens defrost time, in environment temperature lower than security of operation, stable, reliable object when 0 DEG C.
The present invention realizes the technical scheme that above-mentioned purpose takes: a kind of dual system Defrost method, by arranging two cover defrost mechanisms, when making evaporator fin temperature continuously lower than 0 DEG C, and environment temperature higher than 5 DEG C lower than 10 DEG C time, evaporator fin 9a or 9b place heat loop and quit work, and enter nature defrosting mode; When evaporator fin temperature continuously lower than when 0 DEG C and environment temperature lower than 5 DEG C time, enter hot gas defrosting pattern, thered is provided defrosting heat by the high-temperature gas that evaporator fin 9a or 9b of defrosting is discharged by compressor 1b or 1a in another loop, heated loop by the evaporator fin 9a of defrosting or 9b place and quit work.
The nature defrosting mode that enters of the present invention reaches 4 hours lower than 0 DEG C continuously in evaporator fin temperature.
The hot gas defrosting pattern that enters of the present invention reaches 4 hours lower than 0 DEG C continuously in evaporator fin temperature.
The present invention realizes the device of above-mentioned dual system Defrost method, comprise two and heat loop and two cover defrost mechanisms, two described cover defrost mechanisms all form primarily of fin temperature sensor, the first defrosting magnetic valve, the first defrosting check valve, defrosting bypass solenoid valve, the second defrosting magnetic valve, the second defrosting check valve and environment temperature sensor, wherein: heat described in fin temperature sensor is arranged on the evaporator fin in loop; Defrosting bypass solenoid valve (heats described in being serially connected between the evaporator fin in loop and gas-liquid separator; First defrosting magnetic valve and the first defrosting check valve are serially connected in one of them and heat compressor in loop and another one heats between the evaporator fin in loop; Second defrosting magnetic valve and the second defrosting check valve are serially connected in one of them and heat expansion valve in loop and another one heats between the evaporator fin in loop.
The present invention heats in loop at two and is provided with again two cover defrost mechanisms, employ nature defrosting and hot gas defrosting two kinds of defrosting modes simultaneously, when the fin temperature of evaporator fin reach 4 hours lower than 0 DEG C continuously and environment temperature higher than 5 DEG C lower than 10 DEG C time, heated loop by the evaporator fin place of defrosting to quit work, enter nature defrosting mode, do not consume extra energy, when the fin temperature of evaporator fin reach 4 hours lower than 0 DEG C continuously and environment temperature lower than 5 DEG C time, enter hot gas defrosting pattern, the condenser in another loop is switched to by the evaporator fin of defrosting, condenser shut down in another loop, the high-temperature gas of being discharged by the compressor in another loop provides defrosting heat, during defrosting, quit work by loop, defrosting evaporator fin place, do not consume any electric energy, there is not the stoppage protection and hydraulic compression phenomenon that cause because defrosting in this device, this installation cost is low, only need just can realize defrost function by the control of magnetic valve and check valve, structure is simple, system cloud gray model is safer, stable, reliably.Defrost time needed for this kind of defrosting mode only has 1/4 of traditional defrosting mode required time, and the defrosting energy consumed only has 1/4 of reverse cycle defrosting and traditional hot gas bypass defrosting institute consuming electric power.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
In figure: 1a/1b, compressor, 2a/2b, pilot solenoid valve, 3a/3b, water-cooled condenser, 4a/4b, device for drying and filtering, 5a/5b, liquid-sighting glass, 6a/6b, heat magnetic valve, 7a/7b, expansion valve, 8a/8b, heat check valve, 9a/9b, evaporator fin, 10a/10b, axial flow blower, 11a/11b, fin temperature sensor, 12a/12b, gas-liquid separator, 13a/13b, exhaust gas temperature sensor, 14a/14b, first defrosting magnetic valve, 15a/15b, high-low pressure table, 16a/16b, high-low pressure controller, 17a/17b, first defrosting check valve, 18a/18b, defrosting bypass solenoid valve, 19a/19b, second defrosting magnetic valve, 20a/20b, second defrosting check valve, 21a/21b, environment temperature sensor.
Detailed description of the invention
By reference to the accompanying drawings, embodiments of the invention are provided as follows:
As shown in Figure 1: the dual system heat pump defrosting device described in the present embodiment comprises two and heats loop and two cover defrost mechanisms.Two formations heating loop (a system heats loop and heats loop with b system) are all the same with the method for operation, include compressor 1a/1b, pilot solenoid valve 2a/2b, water-cooled condenser 3a/3b, device for drying and filtering 4a/4b, liquid-sighting glass 5a/5b, heat magnetic valve 6a/6b, expansion valve 7a/7b, heat check valve 8a/8b, evaporator fin 9a/9b, axial flow blower 10a/10b, gas-liquid separator 12a/12b, exhaust gas temperature sensor 13a/13b, high-low pressure table 15a/15b and high-low pressure controller 16a/16b.The formation of two cover defrost mechanisms is also all the same with the method for operation, includes fin temperature sensor 11a/11b, the first defrosting magnetic valve 14a/14b, the first defrosting check valve 17a/17b, defrosting bypass solenoid valve 18a/18b, the second defrosting magnetic valve 19a/19b, the second defrosting check valve 20a/20b and environment temperature sensor 21a/21b.Fin temperature sensor 11a/11b is arranged on evaporator fin 9a/9b; Defrosting bypass solenoid valve 18a/18b is serially connected between evaporator fin 9a/9b and gas-liquid separator 12a/12b; First defrosting magnetic valve 14a/14b and the first defrosting check valve 17a/17b is serially connected in one of them and heats compressor 1a/1b in loop and another one heats between the evaporator fin 9b/9a in loop; Second defrosting magnetic valve 19a/19b and the second defrosting check valve 20a/20b is serially connected in one of them and heats expansion valve 7a/7b in loop and another one heats between the evaporator fin 9b/9a in loop.Two described in the present embodiment heat loop is known technology, and in this not go into detail.
When environment temperature is higher than 10 DEG C, dual system heat pump defrosting device is in normal operating conditions, two heat loop independent operating separately, independent control, in a system, in the entery and delivery port of water-cooled condenser 3a and b system, the entery and delivery port correspondence of water-cooled condenser 3b is connected in parallel and forms the total entery and delivery port of recirculated water.A system is the same with the operation principle that heats of b system.Now be described for a system, it is by compressor 1a, pilot solenoid valve 2a, water-cooled condenser 3a, device for drying and filtering 4a, liquid-sighting glass 5a, heat magnetic valve 6a, expansion valve 7a, heat check valve 8a, evaporator fin 9a, axial flow blower 10a, gas-liquid separator 12a, exhaust gas temperature sensor 13a, high-low pressure table 15a, the loop that high-low pressure controller 16a and pipeline thereof are formed, in a heating mode, pilot solenoid valve 2a, heat magnetic valve 6a and defrosting bypass solenoid valve 18a is in opening, first defrosting magnetic valve 14a/14b and the second defrosting magnetic valve 19a/19b is all in closed condition, the high temperature and high pressure gas that compressor 1a discharges enters after water-cooled condenser 3a is recycled water cooling and becomes high temperature high pressure liquid, refrigerant liberated heat is recycled water-band and walks, high temperature high pressure liquid refrigerant becomes low-temp low-pressure fog-like liquid and enters evaporator fin 9a after expansion valve 7a throttling, evaporator fin 9a absorbs a large amount of air energy by the booster action of axial flow blower 10a from surrounding environment, the gas making the liquid refrigerants of low-temp low-pressure generation vaporization become low-temp low-pressure enters compressor 1a, completes one thus and heats circulation.
When the fin temperature of evaporator fin 9a or 9b reach 4 hours lower than 0 DEG C continuously and environment temperature higher than 5 DEG C lower than 10 DEG C time, heat pump main frame just there will be slight frost, at this moment treat that the evaporator fin 9a of defrosting or 9b place heat loop and quit work, enter nature defrosting mode.
When evaporator fin temperature reach 4 hours lower than 0 DEG C continuously and environment temperature lower than 5 DEG C time, enter hot gas defrosting pattern, defrosting heat is provided by the high-temperature gas that evaporator fin 9a or 9b of defrosting is discharged by compressor 1b or 1a in another loop, defrosting is needed to carry out defrosting principles and methods for evaporator fin 9b in b system, during defrosting, evaporator fin 9b place b system stalls, do not consume any electric energy, meanwhile, close the pilot solenoid valve 2a in a system and heat magnetic valve 6a, open the first defrosting magnetic valve 14a, defrosting bypass solenoid valve 18a and the second defrosting magnetic valve 19a, the high-temperature gas refrigerant that now compressor 1a discharges flows through evaporator fin 9b and realizes defrost function, when the temperature of fin temperature sensor 11a is higher than 8 DEG C, defrosting terminates, defrost time only has 1/4 of traditional defrosting mode required time, this defrosting principle is equally applicable in a system by the evaporator fin 9a of defrosting.What this device controlled heat pump main frame by the switching of magnetic valve heats loop and defrost mechanism, and components and parts used are universal elements, employing be known control mode.

Claims (4)

1. a dual system Defrost method, it is characterized in that: by arranging two cover defrost mechanisms, when evaporator fin temperature is continuously lower than 0 DEG C, and environment temperature higher than 5 DEG C lower than 10 DEG C time, evaporator fin 9a or 9b place heat loop and quit work, and enter nature defrosting mode; When evaporator fin temperature continuously lower than when 0 DEG C and environment temperature lower than 5 DEG C time, enter hot gas defrosting pattern, thered is provided defrosting heat by the high-temperature gas that the evaporator fin of defrosting (9a/9b) is discharged by the compressor (1b/1a) in another loop, heated loop quit work by the evaporator fin of defrosting (9a/9b) place.
2. one kind realizes the device of dual system Defrost method described in claim 1, comprise two and heat loop, it is characterized in that: also comprise two cover defrost mechanisms, two described cover defrost mechanisms are all primarily of fin temperature sensor (11a/11b), first defrosting magnetic valve (14a/14b), first defrosting check valve (17a/17b), defrosting bypass solenoid valve (18a/18b), second defrosting magnetic valve (19a/19b), second defrosting check valve (20a/20b) and environment temperature sensor (21a/21b) composition, wherein: heat on the evaporator fin (9a/9b) in loop described in fin temperature sensor is arranged on, heat between the evaporator fin (9a/9b) in loop and gas-liquid separator (12a/12b) described in defrosting bypass solenoid valve is serially connected in, first defrosting magnetic valve and the first defrosting check valve are serially connected in one of them and heat compressor (1a/1b) in loop and another one heats between the evaporator fin (9b/9a) in loop, second defrosting magnetic valve and the second defrosting check valve are serially connected in one of them and heat expansion valve (7a/7b) in loop and another one heats between the evaporator fin (9b/9a) in loop.
3. dual system Defrost method according to claim 1, is characterized in that: described in enter nature defrosting mode be reach 4 hours lower than 0 DEG C continuously in evaporator fin temperature.
4. dual system Defrost method according to claim 1, is characterized in that: described in enter hot gas defrosting pattern be reach 4 hours lower than 0 DEG C continuously in evaporator fin temperature.
CN201310340029.XA 2013-08-07 2013-08-07 Double-system heat pump defrosting method and device Pending CN104344619A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017050073A1 (en) * 2015-09-23 2017-03-30 广东美的暖通设备有限公司 Water chiller-heater unit of air cooled heat pump and defrosting control method therefor
CN107246701A (en) * 2016-09-13 2017-10-13 奥克斯空调股份有限公司 A kind of air conditioner chamber's external heat exchanger defrosting or snow removing control method
CN107289579A (en) * 2017-05-23 2017-10-24 青岛海尔空调器有限总公司 Air conditioner and its defrosting control method
CN109442852A (en) * 2018-11-06 2019-03-08 宁波奥克斯电气股份有限公司 A kind of defrosting control method, device and air source heat pump
CN110701814A (en) * 2019-10-12 2020-01-17 珠海格力电器股份有限公司 Refrigeration dual system with stable operation during defrosting

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CN1590872A (en) * 2003-08-28 2005-03-09 三星电子株式会社 Air conditioner
EP1591736A1 (en) * 2004-04-30 2005-11-02 Lg Electronics Inc. Defrosting method for an air conditioner
CN101093117A (en) * 2007-06-06 2007-12-26 西安建筑科技大学 Winter, summer bi service heat pump apparatus of air source
CN102159901A (en) * 2008-09-16 2011-08-17 松下电器产业株式会社 Air conditioning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1590872A (en) * 2003-08-28 2005-03-09 三星电子株式会社 Air conditioner
EP1591736A1 (en) * 2004-04-30 2005-11-02 Lg Electronics Inc. Defrosting method for an air conditioner
CN101093117A (en) * 2007-06-06 2007-12-26 西安建筑科技大学 Winter, summer bi service heat pump apparatus of air source
CN102159901A (en) * 2008-09-16 2011-08-17 松下电器产业株式会社 Air conditioning device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017050073A1 (en) * 2015-09-23 2017-03-30 广东美的暖通设备有限公司 Water chiller-heater unit of air cooled heat pump and defrosting control method therefor
CN107246701A (en) * 2016-09-13 2017-10-13 奥克斯空调股份有限公司 A kind of air conditioner chamber's external heat exchanger defrosting or snow removing control method
CN107289579A (en) * 2017-05-23 2017-10-24 青岛海尔空调器有限总公司 Air conditioner and its defrosting control method
CN109442852A (en) * 2018-11-06 2019-03-08 宁波奥克斯电气股份有限公司 A kind of defrosting control method, device and air source heat pump
CN110701814A (en) * 2019-10-12 2020-01-17 珠海格力电器股份有限公司 Refrigeration dual system with stable operation during defrosting
CN110701814B (en) * 2019-10-12 2020-11-24 珠海格力电器股份有限公司 Refrigeration dual system with stable operation during defrosting

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