CN107676973A - Frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method - Google Patents

Frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method Download PDF

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Publication number
CN107676973A
CN107676973A CN201711027087.1A CN201711027087A CN107676973A CN 107676973 A CN107676973 A CN 107676973A CN 201711027087 A CN201711027087 A CN 201711027087A CN 107676973 A CN107676973 A CN 107676973A
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frequency
pressure stage
low
temperature
changeable compressor
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CN107676973B (en
Inventor
徐言生
徐旭雁
张鸣
温春华
张超
金波
翁雁归
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Shunde Vocational and Technical College
Shunde Polytechnic
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Shunde Vocational and Technical College
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H4/00Fluid heaters using heat pumps
    • F24H4/02Liquid heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24HFLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT GENERATING MEANS, IN GENERAL
    • F24H9/00Details
    • F24H9/20Arrangement or mounting of control or safety devices or methods
    • F24H9/2007Arrangement or mounting of control or safety devices or methods for water heaters
    • 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
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • 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
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/022Compressor control arrangements
    • 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
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/021Inverters therefor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The present invention relates to a kind of frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method, feature to be:Frequency conversion two-stage compression heat pump water heater carries out dynamic heat operation, Teat pump boiler carries out heating operation simultaneously i.e. during user's heat water, in whole dynamic heat running, to the working frequency optimizing regulation of low-pressure stage frequency-changeable compressor, the aperture of refrigeration system low-pressure stage electric expansion valve, hiigh pressure stage electric expansion valve is accordingly controlled simultaneously, makes the total energy consumption of Teat pump boiler whole service process minimum.Its major advantage is:During frequency conversion two-stage compression heat pump water heater dynamic heat, optimize low-pressure stage frequency-changeable compressor working frequency, the aperture of low-pressure stage electric expansion valve and hiigh pressure stage electric expansion valve is controlled using optimal Energy Efficiency Ratio as target simultaneously, makes whole dynamic heat running total energy consumption minimum.

Description

Frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method
Technical field
The present invention relates to heat-pump water heater control method, particularly a kind of frequency conversion two-stage compression heat pump water heater dynamic heat Frequency optimization and control method.
Background technology
Two-stage compression heat pump water heater can produce high-temperature-hot-water under relatively low outdoor environment temperature.At present, Two-stage Compression The low-pressure stage frequency-changeable compressor of Teat pump boiler is generally frequency-changeable compressor, and hiigh pressure stage is invariable frequency compressor.Due to frequency conversion twin-stage Compressing hot pump water heater in the process of running low-pressure stage frequency-changeable compressor working frequency and heat pump refrigeration system medium temperature to heat Pump water heater heating capacity and energy consumption are larger;Chinese patent disclose " a kind of frequency conversion two-stage compression heat pump water heater dynamic plus The control method of heat ", the patent No. is ZL201410759807.3 patent of invention;It can be according to user's heat demand and Heat Pump The medium temperature of hydrophone outdoor environment temperature, water tank temperature regulation low-pressure stage frequency-changeable compressor working frequency and heat pump refrigerating;Base Present principles be make Teat pump boiler during whole service each moment instantaneous Energy Efficiency Ratio as close possible under the operating condition Optimal Energy Efficiency Ratio, namely instantaneous Energy Efficiency Ratio of each moment is higher, the Teat pump boiler under conditions of identical total heating capacity is obtained Total energy consumption is smaller during whole service, but the condition that this conclusion is set up is that the instantaneous heating capacity of heat pump must during whole service Must be equal.Actually Teat pump boiler in the process of running, due to the change of operating condition and the change of compressor frequency, is led The instantaneous heating capacity of pyrogenicity pump water heater changes greatly;Therefore, the frequency conversion double stage heat pump water heater low pressure that aforementioned patent document proposes Level frequency-changeable compressor frequency adjustment method still has to be optimized.In addition, existing frequency conversion double stage heat pump water heater compressor frequency is adjusted Section method is based primarily upon stable mode of heating, and heat pump is in running is heated, and the water in water tank is closing heating, i.e., herein During water tank do not put hot water, also enter without cold water, water temperature is in propradation all the time.Actually in most cases user exists Water temperature can constantly it be declined out of external complement cold water, water tank with water tank when water, heat pump water tank water temperature in heating process It is a dynamic process risen after falling before, namely dynamic heat, the related mark of USDOE's Teat pump boiler efficiency test Standard is also to be formulated by dynamic heat.During this frequency conversion two-stage compression heat pump water heater dynamic heat, it should consider instantaneous The change of heating capacity, also to consider the situation of water tank Inlet and outlet water, low-pressure stage frequency-changeable compressor frequency and heat pump refrigeration system are entered Row optimal control, it can just make Teat pump boiler whole service process total energy consumption minimum.
The content of the invention
The purpose of the present invention is overcome the deficiencies in the prior art and a kind of frequency conversion two-stage compression heat pump water heater for providing moves State heating frequency optimizes and control method, and it can be according to Teat pump boiler outdoor environment temperature, water tank temperature and user's regimen Condition, optimize low-pressure stage frequency-changeable compressor working frequency during Teat pump boiler dynamic heat, while adjust low-pressure stage electronics The aperture of expansion valve and hiigh pressure stage electric expansion valve, make Teat pump boiler whole service process total energy consumption minimum, reach energy-conservation mesh 's.
In order to achieve the above object, the present invention is achieved in that it is that a kind of frequency conversion two-stage compression heat pump water heater moves State heating frequency optimizes and control method, and frequency conversion two-stage compression heat pump water heater includes low-pressure stage frequency-changeable compressor, low-pressure stage becomes Frequency compressor exhaust temperature sensor, hiigh pressure stage invariable frequency compressor, high pressure stage compressor exhaust gas temperature sensor, controller, water Case sensor, water tank, condenser, hiigh pressure stage electric expansion valve, intercooler temperature sensor, intercooler, low-pressure stage Electric expansion valve, evaporator and outdoor temperature sensor;It is characterized in that:Frequency conversion two-stage compression heat pump water heater enters Mobile state and added Heat operation, i.e., Teat pump boiler carries out heating operation simultaneously during user's heat water, in whole dynamic heat running In, to the working frequency optimizing regulation of low-pressure stage frequency-changeable compressor, while to refrigeration system low-pressure stage electric expansion valve, hiigh pressure stage The aperture of electric expansion valve is accordingly controlled, and makes the total energy consumption of Teat pump boiler whole service process minimum;Low-pressure stage frequency conversion The working frequency optimal regulation method and low-pressure stage electric expansion valve of compressor and the aperture controlling party of hiigh pressure stage electric expansion valve Method is as follows:
(a)Determine Teat pump boiler dynamic heat base operation condition, including outdoor environment temperature TWAnd relative humidity φ, water tank are set Determine ceiling temperature TS, lower limit temperature TX, enter cold water temperature and with hot water temperature, specified water consumption;
(b)Teat pump boiler is established with outdoor environment temperature TO, water tank actual temperature T and low-pressure stage frequency-changeable compressor work Frequency f changes, using optimal instantaneous trapped energy theory as the low-pressure stage electric expansion valve of target and the aperture of hiigh pressure stage electric expansion valve Combination table;
(c)The working frequency f of setting stepwise low-pressure stage frequency-changeable compressor:According to the setting upper limit water temperature T of water tankSWith lower limit water temperature TXDifference, this temperature difference is divided into n temperature section, n >=2, different segmentations is used in each temperature section low-pressure stage frequency-changeable compressor Working frequency fi
(d)Situation, the fragmentary works frequency f of each temperature section low-pressure stage frequency-changeable compressor are segmented according to the temperature difference of water tankiBy equal difference Ordered series of numbers is distributed, and obtains each temperature rise band frequency fiCalculation formula I:fi=fg-(fg-fd) (i-1)/(n-1), in calculation formula I, fg For the highest frequency value of low-pressure stage frequency-changeable compressor during whole service;fdCompressed for low-pressure stage frequency conversion during whole service The lowest frequency value of machine;I represents each warming-up section corresponding to since initial heating, i=1,2 ..., n;
(e)With the minimum target of total energy consumption in the whole dynamic running process of Teat pump boiler, obtained by experiment in base operation condition Under, the highest frequency f of low-pressure stage frequency-changeable compressorgWith low-limit frequency fd, it is low according to corresponding to calculation formula I obtains each temperature section Arbitrarily downgrade the working frequency f of frequency-changeable compressori
(f)When Teat pump boiler actual operating mode deviates base operation condition, according to actual outdoor environment temperature TOTo correct water The fragmentary works frequency f of low-pressure stage frequency-changeable compressor corresponding to each temperature section of casei;Actual operating mode low-pressure stage frequency-changeable compressor Actual operating frequency giBy formula II:gi=kfiIt is modified, different outdoor environment temperature TOCorresponding different k, passes through reality Test to obtain;
(g)In the water temperature drop and uphill process of water tank, the working frequency of low-pressure stage frequency-changeable compressor is calculated by formula II Obtained actual operating frequency giWork;
(h)Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature such as obtained by formula II The actual operating frequency g of section low-pressure stage frequency-changeable compressoriThe middle temperature section occurred less than 20Hz, the temperature section low-pressure stage frequency conversion pressure The working frequency of contracting machine is run by 20Hz;As there is the temperature section more than 100Hz, then the temperature section low-pressure stage frequency-changeable compressor Working frequency is run by 100Hz;
(i)In Teat pump boiler running, controller is according to outdoor environment temperature TO, water tank actual temperature T and low-pressure stage The working frequency f of frequency-changeable compressor, adjusted according to the aperture combination table of low-pressure stage electric expansion valve and hiigh pressure stage electric expansion valve The aperture of low-pressure stage electric expansion valve and hiigh pressure stage electric expansion valve.
In the technical program, in each temperature rise section of water tank, the fragmentary works frequency f of low-pressure stage frequency-changeable compressoriCan be with It is distributed by conic section, i.e. formula III:fi=ai2+ bi+c, a in formula III, b, c are to be by test obtained conic section Number.
In the technical program, the low-pressure stage frequency-changeable compressor is AC frequency conversion compressor or DC speed regulation compressor.
Compared with prior art, its major advantage is the present invention:Frequency conversion two-stage compression heat pump water heater dynamic heat process In, optimize low-pressure stage frequency-changeable compressor working frequency, while be target to low-pressure stage electric expansion valve and height using optimal Energy Efficiency Ratio The aperture of electric expansion valve of arbitrarily downgrading is controlled, and makes whole dynamic heat running total energy consumption minimum.
Brief description of the drawings
Fig. 1 is the frequency conversion two-stage compression heat pump water-heater system schematic diagram that the present invention is implemented;
Fig. 2 is water tank temperature change schematic diagram during the frequency conversion two-stage compression heat pump water heater dynamic heat that the present invention is implemented.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings.Below with reference to The embodiment of accompanying drawing description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
As shown in figure 1, frequency conversion two-stage compression heat pump water heater includes low-pressure stage frequency-changeable compressor 1, low-pressure stage frequency conversion is compressed Machine exhaust gas temperature sensor 2, hiigh pressure stage invariable frequency compressor 3, high pressure stage compressor exhaust gas temperature sensor 4, controller 5, water tank Sensor 6, water tank 7, condenser 8, hiigh pressure stage electric expansion valve 9, intercooler 10, intercooler temperature sensor 11, Low-pressure stage electric expansion valve 12, evaporator 13 and outdoor temperature sensor 14;As shown in Fig. 2 Teat pump boiler dynamic heat mistake Journey is as follows:The water temperature of water tank 7 is setting ceiling temperature T during beginningS, from time t1When user starts to use hot water, water tank can be from outside Cold water is supplemented, water temperature starts to reduce in water tank 7, and Teat pump boiler also begins to heating operation, due to being more than heat with the heat of hot water Heat pump heating amount, water temperature continues to reduce in water tank 7, when water temperature reaches design temperature lower limit TXWhen, user stops using water, now the time For t2, because Teat pump boiler only heats, user does not have to hot water, and water temperature is begun to ramp up, until time t3Reach the set water temperature upper limit TSWhen, Teat pump boiler is stopped, time t1To t3For one complete dynamic heat process of Teat pump boiler;Entirely moving In state heating process, the working frequency dynamic optimization adjusting method and refrigeration system low-pressure stage electronics of low-pressure stage frequency-changeable compressor 1 The aperture control method of expansion valve 12 and hiigh pressure stage electric expansion valve 9 is as follows:
(a)Determine Teat pump boiler dynamic heat base operation condition, including outdoor environment temperature TWAnd relative humidity φ, water tank 7 Set ceiling temperature TS, lower limit temperature TX, enter cold water temperature and with hot water temperature, specified water consumption;
(b)Teat pump boiler is established with outdoor environment temperature TO, the actual temperature T of water tank 7 and the work of low-pressure stage frequency-changeable compressor 1 Working frequency f changes, low-pressure stage electric expansion valve 12 and hiigh pressure stage electronic expansion 9 using optimal instantaneously trapped energy theory as target Aperture combination table;
(c)The working frequency f of setting stepwise low-pressure stage frequency-changeable compressor 1:According to the setting upper limit water temperature T of water tank 7SRestricted water supply with Warm TXDifference, this temperature difference is divided into n temperature section, n >=2, in each temperature section low-pressure stage frequency-changeable compressor 1 using different points Section working frequency fi
(d)Situation, the fragmentary works frequency f of each temperature section low-pressure stage frequency-changeable compressor 1 are segmented according to the temperature difference of water tank 7iBy etc. Difference column distribution, obtain each temperature rise band frequency fiCalculation formula I:fi=fg-(fg-fd) (i-1)/(n-1), in calculation formula I, fgFor the highest frequency value of low-pressure stage frequency-changeable compressor 1 during whole service;fdFor low-pressure stage frequency conversion pressure during whole service The lowest frequency value of contracting machine 1;I represents each warming-up section corresponding to since initial heating, i=1,2 ..., n;
(e)With the minimum target of total energy consumption in the whole dynamic running process of Teat pump boiler, obtained by experiment in base operation condition Under, the highest frequency f of low-pressure stage frequency-changeable compressor 1gWith low-limit frequency fd, it is low according to corresponding to calculation formula I obtains each temperature section Arbitrarily downgrade the working frequency f of frequency-changeable compressor 1i
(f)When Teat pump boiler actual operating mode deviates base operation condition, according to actual outdoor environment temperature TOTo correct water The fragmentary works frequency f of low-pressure stage frequency-changeable compressor 1 corresponding to 7 each temperature section of casei;The frequency conversion of actual operating mode low-pressure stage is compressed The actual operating frequency g of machine 1iBy formula II:gi=kfiIt is modified, different outdoor environment temperature TOCorresponding different k, leads to Experiment is crossed to obtain;
(g)In the water temperature drop and uphill process of water tank 7, the working frequency of low-pressure stage frequency-changeable compressor 1 is based on formula II Obtained actual operating frequency giWork;
(h)Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature such as obtained by formula II The actual operating frequency g of section low-pressure stage frequency-changeable compressor 1iThe middle temperature section occurred less than 20Hz, the temperature section low-pressure stage frequency conversion The working frequency of compressor 1 is run by 20Hz;As there is the temperature section more than 100Hz, then the temperature section low-pressure stage frequency conversion is compressed The working frequency of machine 1 is run by 100Hz;
(i)In Teat pump boiler running, controller 5 is according to outdoor environment temperature TO, water tank 7 actual temperature T and low pressure The working frequency f of level frequency-changeable compressor 1, is combined according to the aperture of low-pressure stage electric expansion valve 12 and hiigh pressure stage electric expansion valve 9 The aperture of table regulation low-pressure stage electric expansion valve 12 and hiigh pressure stage electric expansion valve 9.
In the present embodiment, in each temperature rise section of water tank 7, the fragmentary works frequency f of low-pressure stage frequency-changeable compressor 1iCan be with It is distributed by conic section, i.e. formula III:fi=ai2+ bi+c, a in formula III, b, c are to be by test obtained conic section Number.
In the present embodiment, the low-pressure stage frequency-changeable compressor 1 is AC frequency conversion compressor or DC speed regulation compressor.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that:Not These embodiments can be carried out with a variety of changes, modification in the case of departing from principle and objective of the invention, replace and deform, this The scope of invention is limited by claim and its equivalent.

Claims (3)

1. a kind of frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method, frequency conversion two-stage compression heat pump heat Hydrophone includes low-pressure stage frequency-changeable compressor(1), low-pressure stage frequency-changeable compressor exhaust gas temperature sensor(2), hiigh pressure stage compresses frequently surely Machine(3), high pressure stage compressor exhaust gas temperature sensor(4), controller(5), tank sensor(6), water tank(7), condenser (8), hiigh pressure stage electric expansion valve(9), intercooler temperature sensor(10), intercooler(11), low-pressure stage electronics it is swollen Swollen valve(12), evaporator(13)And outdoor temperature sensor(14);It is characterized in that:Frequency conversion two-stage compression heat pump water heater is carried out Dynamic heat is run, i.e., Teat pump boiler carries out heating operation simultaneously during user's heat water, is transported in whole dynamic heat During row, to low-pressure stage frequency-changeable compressor(1)Working frequency optimizing regulation, while to refrigeration system low-pressure stage electronic expansion Valve(12), hiigh pressure stage electric expansion valve(9)Aperture accordingly controlled, make the total energy consumption of Teat pump boiler whole service process It is minimum;Low-pressure stage frequency-changeable compressor(1)Working frequency optimal regulation method and low-pressure stage electric expansion valve(12)And hiigh pressure stage Electric expansion valve(9)Aperture control method it is as follows:
Determine Teat pump boiler dynamic heat base operation condition, including outdoor environment temperature TWAnd relative humidity φ, water tank(7)Set Determine ceiling temperature TS, lower limit temperature TX, enter cold water temperature and with hot water temperature, specified water consumption;
Teat pump boiler is established with outdoor environment temperature TO, water tank(7)Actual temperature T and low-pressure stage frequency-changeable compressor(1)Work Working frequency f changes, the low-pressure stage electric expansion valve using optimal instantaneous trapped energy theory as target(12)And hiigh pressure stage electric expansion valve (9)Aperture combination table;
Setting stepwise low-pressure stage frequency-changeable compressor(1)Working frequency f:According to water tank(7)Setting upper limit water temperature TSRestricted water supply with Warm TXDifference, this temperature difference is divided into n temperature section, n >=2, in each temperature section low-pressure stage frequency-changeable compressor(1)Using different Fragmentary works frequency fi
According to water tank(7)The temperature difference segmentation situation, each temperature section low-pressure stage frequency-changeable compressor(1)Fragmentary works frequency fiBy etc. Difference column distribution, obtain each temperature rise band frequency fiCalculation formula I:fi=fg-(fg-fd) (i-1)/(n-1), in calculation formula I, fgFor low-pressure stage frequency-changeable compressor during whole service(1)Highest frequency value;fdFor low-pressure stage frequency conversion during whole service Compressor(1)Lowest frequency value;I represents each warming-up section corresponding to since initial heating, i=1,2 ..., n;
With the minimum target of total energy consumption in the whole dynamic running process of Teat pump boiler, obtained by experiment under base operation condition, Low-pressure stage frequency-changeable compressor(1)Highest frequency fgWith low-limit frequency fd, it is low according to corresponding to calculation formula I obtains each temperature section Arbitrarily downgrade frequency-changeable compressor(1)Working frequency fi
When Teat pump boiler actual operating mode deviates base operation condition, according to actual outdoor environment temperature TOTo correct water tank(7) Low-pressure stage frequency-changeable compressor corresponding to each temperature section(1)Fragmentary works frequency fi;The frequency conversion of actual operating mode low-pressure stage is compressed Machine(1)Actual operating frequency giBy formula II:gi=kfiIt is modified, different outdoor environment temperature TOCorresponding different k, Obtained by experiment;
In water tank(7)Water temperature drop and uphill process in, low-pressure stage frequency-changeable compressor(1)Working frequency based on formula II Obtained actual operating frequency giWork;
Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature section such as obtained by formula II is low Arbitrarily downgrade frequency-changeable compressor(1)Actual operating frequency giThe middle temperature section occurred less than 20Hz, the temperature section low-pressure stage frequency conversion pressure Contracting machine(1)Working frequency by 20Hz run;As there is the temperature section more than 100Hz, then the temperature section low-pressure stage frequency conversion is compressed Machine(1)Working frequency by 100Hz run;
In Teat pump boiler running, controller(5)According to outdoor environment temperature TO, water tank(7)Actual temperature T and low pressure Level frequency-changeable compressor(1)Working frequency f, according to low-pressure stage electric expansion valve(12)And hiigh pressure stage electric expansion valve(9)Open Spend combination table regulation low-pressure stage electric expansion valve(12)And hiigh pressure stage electric expansion valve(9)Aperture.
2. frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization according to claim 1 and control method, its It is characterised by water tank(7)Each temperature rise section, low-pressure stage frequency-changeable compressor(1)Fragmentary works frequency fiCan be by conic section Distribution, i.e. formula III:fi=ai2+ bi+c, a in formula III, b, c are the coefficient by testing obtained conic section.
3. low-pressure stage frequency-changeable compressor according to claim 1(1), it is characterised in that the low-pressure stage frequency-changeable compressor (1)It is AC frequency conversion compressor or DC speed regulation compressor.
CN201711027087.1A 2017-10-27 2017-10-27 Dynamic heating frequency optimization and control method for variable-frequency two-stage compression heat pump water heater Active CN107676973B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201463389U (en) * 2009-07-30 2010-05-12 天津商业大学 Two-stage compression steam-type refrigeration system for high-pressure stage air supplement
CN104501421A (en) * 2014-12-12 2015-04-08 顺德职业技术学院 Control method of variable-frequency two-stage compressive heat pump water heater
JP2015148407A (en) * 2014-02-07 2015-08-20 パナソニックIpマネジメント株式会社 Refrigeration device
WO2015158174A1 (en) * 2014-04-15 2015-10-22 珠海格力电器股份有限公司 Refrigeration device
CN105962005A (en) * 2016-05-09 2016-09-28 顺德职业技术学院 Energy-saving control method of twin-stage compression type heat pump vacuum freeze drying combined device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201463389U (en) * 2009-07-30 2010-05-12 天津商业大学 Two-stage compression steam-type refrigeration system for high-pressure stage air supplement
JP2015148407A (en) * 2014-02-07 2015-08-20 パナソニックIpマネジメント株式会社 Refrigeration device
WO2015158174A1 (en) * 2014-04-15 2015-10-22 珠海格力电器股份有限公司 Refrigeration device
CN104501421A (en) * 2014-12-12 2015-04-08 顺德职业技术学院 Control method of variable-frequency two-stage compressive heat pump water heater
CN105962005A (en) * 2016-05-09 2016-09-28 顺德职业技术学院 Energy-saving control method of twin-stage compression type heat pump vacuum freeze drying combined device

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