CN107906752A - Twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimizes and control method - Google Patents

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

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CN107906752A
CN107906752A CN201711021478.2A CN201711021478A CN107906752A CN 107906752 A CN107906752 A CN 107906752A CN 201711021478 A CN201711021478 A CN 201711021478A CN 107906752 A CN107906752 A CN 107906752A
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frequency
pressure stage
low
changeable compressor
temperature
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CN107906752B (en
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吴治将
李锡宇
李东洺
王斯焱
徐言生
彭莺
陈妙阳
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Shunde Vocational and Technical College
Shunde Polytechnic
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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
    • F24H4/04Storage 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
    • F24H9/2014Arrangement or mounting of control or safety devices or methods for water heaters for heaters using electrical energy supply
    • F24H9/2021Storage heaters

Abstract

The present invention relates to a kind of optimization of twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic and control method, twin-stage frequency conversion two-stage compression heat pump water heater to include low-pressure stage frequency-changeable compressor, low-pressure stage compressor exhaust temperature sensor, hiigh pressure stage frequency-changeable compressor, high pressure stage compressor exhaust gas temperature sensor, controller, tank 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;Feature is:During Teat pump boiler whole service, the working frequency dynamic optimization of low-pressure stage frequency-changeable compressor and hiigh pressure stage frequency-changeable compressor is adjusted, makes the total energy consumption of Teat pump boiler whole service process minimum.Its major advantage is:Make twin-stage frequency conversion two-stage compression heat pump water heater dynamic optimization low-pressure stage compressor and high pressure stage compressor working frequency during whole service, make whole service process total energy consumption minimum.

Description

Twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimizes and control method
Technical field
The present invention relates to heat-pump water heater control method, particularly a kind of twin-stage frequency conversion two-stage compression heat pump water heater 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.Low-pressure stage compressor and High pressure stage compressor uses the twin-stage frequency conversion two-stage compression heat pump water heater heating capacity regulating power and efficiency of frequency-changeable compressor Compare higher.The frequency conversion two-stage compression heat pump water heater of invariable frequency compressor is used using frequency-changeable compressor, hiigh pressure stage for low-pressure stage, To improve its operational energy efficiency ratio, Chinese patent discloses the invention of " a kind of control method of frequency conversion two-stage compression heat pump water heater " Patent, its patent of invention number are ZL201410759807.3, it can be according to user's heat demand and Teat pump boiler outdoor environment The medium temperature of temperature, water tank temperature dynamic regulation low-pressure stage compressor operating frequency and heat pump refrigerating;Its basic principle is to make Teat pump boiler during whole service each moment instantaneous Energy Efficiency Ratio as close possible to the optimal efficiency under the operating condition Than, namely instantaneous Energy Efficiency Ratio of each moment is higher, the Teat pump boiler whole service under conditions of identical total heating capacity is obtained Total energy consumption is smaller in journey;But the condition that this conclusion is set up is that the instantaneous heating capacity of heat pump must be equal during whole service.It is real Teat pump boiler causes heat-pump hot-water in the process of running due to the change of operating condition and the change of compressor frequency on border The instantaneous heating capacity of device changes greatly, therefore the frequency conversion double stage heat pump water heater low-pressure stage compressor frequency that aforementioned patent document proposes Adjusting method still has to be optimized, namely in frequency conversion double stage heat pump water heater low-pressure stage compressor frequency optimization process, also needs to examine Consider the change of instantaneous heating capacity, can just make Teat pump boiler whole service process total energy consumption minimum.In addition, twin-stage frequency conversion twin-stage pressure Also there are the coupled problem between low-pressure stage compressor operating frequency and high pressure stage compressor working frequency for contracting Teat pump boiler.
The content of the invention
A kind of twin-stage frequency conversion two-stage compression heat pump hot water provided the purpose of the present invention is overcome the deficiencies in the prior art Device frequency dynamic optimizes and control method, it can be according to user's heat demand and Teat pump boiler outdoor environment temperature, water tank temperature Dynamic regulation low-pressure stage frequency-changeable compressor working frequency is spent, while according to Teat pump boiler refrigeration system optimum interstage temperature, is adjusted Hiigh pressure stage frequency-changeable compressor working frequency is saved, makes Teat pump boiler whole service process total energy consumption minimum, reaches energy saving purpose.
In order to achieve the above object, the present invention is achieved in that it is a kind of twin-stage frequency conversion two-stage compression heat pump hot water Device frequency dynamic optimizes and control method, and twin-stage frequency conversion two-stage compression heat pump water heater includes low-pressure stage frequency-changeable compressor, low pressure Level compressor exhaust temperature sensor, hiigh pressure stage frequency-changeable 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 during Teat pump boiler whole service, to low-pressure stage The working frequency dynamic optimization of frequency-changeable compressor and hiigh pressure stage frequency-changeable compressor is adjusted, and makes Teat pump boiler whole service process Total energy consumption is minimum;The working frequency dynamic optimization adjusting method of low-pressure stage frequency-changeable compressor and hiigh pressure stage frequency-changeable compressor is as follows:
(a)Teat pump boiler is established with outdoor environment temperature T1, water tank actual temperature T2Change, with optimal instantaneous Energy Efficiency Ratio EER is the heat pump refrigeration system medium temperature T of target3Relational expression I:T3=F(T1,T2);
(b)Establish the instantaneous heating capacity q of Teat pump boiler and outdoor environment temperature T1, water tank actual temperature T2And low-pressure stage frequency conversion The working frequency f of compressoraBetween relational expression II:q=E(T1,T2,fa);It is whole that Teat pump boiler can be obtained according to relational expression II The expression formula III of total heating capacity Q in a run time t:
(c)Establish the instantaneous energy consumption p of Teat pump boiler and outdoor environment temperature T1, water tank actual temperature T2And low-pressure stage frequency conversion pressure The working frequency f of contracting machineaBetween relational expression IV:p= F(T1,T2,fa);It is whole that Teat pump boiler can be obtained according to relational expression IV The expression formula V of total energy consumption P in a run time t:
(d)User sets the specific moment t with water0With water tank water temperature T, controller detects the actual temperature T of current water tank2, meter Total heating capacity Q needed for calculating, using Teat pump boiler whole service process total energy consumption P minimums as desired value, according to expression formula III And the working frequency f of low-pressure stage frequency-changeable compressor during whole service is calculated in expression formula VaWith run time t changes Relational expression VI:fa=F (t), Teat pump boiler press VI dynamic regulation low-pressure stage frequency-changeable compressor of relational expression during whole service Working frequency fa
(e)Controller detection outdoor environment temperature T1, water tank actual temperature T2, optimal centre is calculated according to relational expression I Temperature T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressorb, make medium temperature sensor detect actual medium temperature The optimum interstage temperature T that convergence is calculated3Value.
In the technical program, during Teat pump boiler whole service, relational expression VI is simplified to obtain one kind The working frequency of temperature section, discrete low-pressure stage frequency-changeable compressor is divided to simplify adjusting method, and to hiigh pressure stage frequency-changeable compressor Working frequency accordingly adjusted, specific method is as follows:
(a)The working frequency f of setting stepwise low-pressure stage frequency-changeable compressora:According to the set water temperature T of water tank and initial water temperature T0It Difference, the process of will heat up are divided into n sections, and n >=2, every section of limit of temperature rise is 2-15 DEG C, and preferably temperature rise is 5 DEG C, in each temperature rise section low pressure Level frequency-changeable compressor uses different working frequency fai
(b)Situation, the working frequency f of each temperature rise section low-pressure stage frequency-changeable compressor are segmented according to the temperature rise of water tankaiBy arithmetic progression Distribution, obtains each temperature rise band frequency faiCalculation formula VII:fai=fg-(fg-fd) (i-1)/(n-1), in calculation formula VII, fgFor The highest frequency value of low-pressure stage frequency-changeable compressor during whole service;fdFor low-pressure stage frequency-changeable compressor during whole service Lowest frequency value;I represents corresponding each warming-up section, i=1,2 ..., n since initial heating;
(c)Controller detection outdoor environment temperature T1, the current actual water temperature T of water tank2, user setting it is specific with water moment t0 Coolant-temperature gage T is used with the water tank of setting, and sets the low-limit frequency f of low-pressure stage frequency-changeable compressordInitial value be 30Hz, low pressure The highest frequency f of level frequency-changeable compressorgInitial value be 80Hz;
(d)Controller calculating current time sets specific with water moment t to user0Between time ts, and according to expression formula IIIth, expression formula V and calculation formula VII be calculated water tank water temperature reach design temperature T operation the time required to tj, such as | ts-tj| ≤ 5min, shows that the working frequency setting of each temperature rise section low-pressure stage frequency-changeable compressor is reasonable, low-pressure stage frequency-changeable compressor 1 starts work Make;Such as ts-tj>=5min, then by the highest frequency f of low-pressure stage frequency-changeable compressorg1Hz is reduced every time to calculate again, until meeting | ts-tj|≤5min, such as fgStill backlog demand when being down to 30Hz, then postpone low-pressure stage frequency-changeable compressor and hiigh pressure stage frequency conversion pressure Contracting machine starts the time started, its time delay calculates to be calculated with the operation of 30Hz frequencies all the time by low-pressure stage frequency-changeable compressor Arrive;Such as ts-tj≤ -5min, then by the low-limit frequency f of low-pressure stage frequency-changeable compressordImprove 1Hz every time to calculate again, until meeting | ts-tj|≤5min, such as fdImprove to still backlog demand during 80Hz, low-pressure stage becomes during Teat pump boiler whole service Frequency compressor keeps a fixed frequency, will improve 1Hz every time on the basis of 80Hz and calculate again, until meeting the requirements;Such as The working frequency for the low-pressure stage frequency-changeable compressor being calculated occur is more than the low-pressure stage frequency-changeable compressor of Teat pump boiler setting Operation upscale protection frequency, then low-pressure stage frequency-changeable compressor by the upscale protection frequency run;Upscale protection frequency is generally 100Hz;
(e)Controller detection outdoor environment temperature T1, water tank actual temperature T2, optimal centre is calculated according to relational expression I Temperature T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressorb, make medium temperature sensor detect actual medium temperature The optimum interstage temperature T that convergence is calculated3Value.
In the technical program, the working frequency f of each temperature rise section low-pressure stage frequency-changeable compressor of the water tankai, can be right Relational expression VI presses conic section fai=ai2+ bi+c is simplified.
In the technical program, the low-limit frequency f of the low-pressure stage frequency-changeable compressordThe scope of initial value be 10- 40Hz, highest frequency fgThe scope of initial value be 60-100Hz.
In the technical program, the low-pressure stage frequency-changeable compressor and hiigh pressure stage frequency-changeable compressor can be AC frequency conversion pressure Contracting machine or DC speed regulation compressor.
Compared with prior art, the present invention its major advantage is:Make twin-stage frequency conversion two-stage compression heat pump water heater whole Dynamic optimization low-pressure stage compressor and high pressure stage compressor working frequency in operational process, make whole service process total energy consumption most It is small.
Brief description of the drawings
Fig. 1 is the twin-stage frequency conversion two-stage compression heat pump water-heater system schematic diagram that the present invention is implemented.
Embodiment one
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings.Below with reference to attached drawing The embodiment of description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Twin-stage frequency conversion two-stage compression heat pump water heater includes low-pressure stage frequency-changeable compressor 1, low-pressure stage compressor exhaust temperature Sensor 2, hiigh pressure stage frequency-changeable compressor 3, high pressure stage compressor exhaust gas temperature sensor 4, controller 5, tank sensor 6, storage Water tank 7, condenser 8, hiigh pressure stage electric expansion valve 9, intercooler temperature sensor 10, intercooler temperature sensor 11st, low-pressure stage electric expansion valve 12, evaporator 13 and outdoor temperature sensor 14;Low-pressure stage frequency-changeable compressor 1 and hiigh pressure stage become The working frequency dynamic optimization adjusting method of frequency compressor 3 is as follows:
(a)Teat pump boiler is established with outdoor environment temperature T1, water tank 7 actual temperature T2Change, with optimal instantaneous Energy Efficiency Ratio EER is the heat pump refrigeration system medium temperature T of target3Relational expression I:T3=F(T1,T2);
(b)Establish the instantaneous heating capacity q of Teat pump boiler and outdoor environment temperature T1, water tank 7 actual temperature T2And low-pressure stage becomes The working frequency f of frequency compressor 1aBetween relational expression II:q=E(T1,T2,fa);Heat-pump hot-water can be obtained according to relational expression II The expression formula III of total heating capacity Q in device whole service time t:
(c)Establish the instantaneous energy consumption p of Teat pump boiler and outdoor environment temperature T1, water tank 7 actual temperature T2And low-pressure stage frequency conversion The working frequency f of compressor 1aBetween relational expression IV:p= F(T1,T2,fa);Heat-pump hot-water can be obtained according to relational expression IV The expression formula V of total energy consumption P in device whole service time t:
(d)User sets the specific moment t with water0With water tank water temperature T, controller 5 detects the actual temperature T of current water tank 72, Total heating capacity Q needed for calculating, using Teat pump boiler whole service process total energy consumption P minimums as desired value, according to expression formula III and expression formula V the working frequency f of low-pressure stage frequency-changeable compressor 1 during whole service is calculatedaBecome with run time t The relational expression VI of change:fa=F (t), Teat pump boiler press VI dynamic regulation low-pressure stage frequency conversion pressure of relational expression during whole service The working frequency f of contracting machine 1a
(e)Controller 5 detects outdoor environment temperature T1, water tank 7 actual temperature T2, in being calculated most preferably according to relational expression I Between temperature T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressor 3b, make the detection of medium temperature sensor 11 in practice Between the optimum interstage temperature T that is calculated of temperatures approach3Value.
In the present embodiment, during Teat pump boiler whole service, relational expression VI is simplified to obtain a kind of point of temperature Section, the working frequency of discrete low-pressure stage frequency-changeable compressor 1 simplification adjusting method are spent, and to hiigh pressure stage frequency-changeable compressor 3 Working frequency is accordingly adjusted, and specific method is as follows:
(a)The working frequency f of setting stepwise low-pressure stage frequency-changeable compressor 1a:According to the set water temperature T of water tank 7 and initial water temperature T0 Difference, the process of will heat up is divided into n sections, and n >=2, every section of limit of temperature rise is 2-15 DEG C, and preferably temperature rise is 5 DEG C, low in each temperature rise section Frequency-changeable compressor 1 of arbitrarily downgrading uses different working frequency fai
(b)Situation, the working frequency f of each temperature rise section low-pressure stage frequency-changeable compressor 1 are segmented according to the temperature rise of water tank 7aiBy grade difference Column distribution, obtains each temperature rise band frequency faiCalculation formula VII:fai=fg-(fg-fd) (i-1)/(n-1), in calculation formula VII, fg For 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 corresponding each warming-up section, i=1,2 ..., n since initial heating;
(c)Controller 5 detects outdoor environment temperature T1, the current actual water temperature T of water tank 72, user setting it is specific with the water moment t0Coolant-temperature gage T is used with the water tank 7 of setting, and sets the low-limit frequency f of low-pressure stage frequency-changeable compressor 1dInitial value be 30Hz, The highest frequency f of low-pressure stage frequency-changeable compressor 1gInitial value be 80Hz;
(d)The calculating current time of controller 5 sets specific with water moment t to user0Between time ts, and according to expression formula IIIth, expression formula V and calculation formula VII be calculated water tank 7 water temperature reach design temperature T operation the time required to tj, such as | ts-tj |≤5min, shows that the working frequency setting of each temperature rise section low-pressure stage frequency-changeable compressor 1 is reasonable, low-pressure stage frequency-changeable compressor 1 starts Work;Such as ts-tj>=5min, then by the highest frequency f of low-pressure stage frequency-changeable compressor 1gReduce 1Hz every time to calculate again, until full Foot | ts-tj|≤5min, such as fgStill backlog demand when being down to 30Hz, then postpone low-pressure stage frequency-changeable compressor 1 and hiigh pressure stage become Frequency compressor 3 start start time, its time delay calculate by low-pressure stage frequency-changeable compressor 1 all the time by 30Hz frequencies operation in terms of Obtain;Such as ts-tj≤ -5min, then by the low-limit frequency f of low-pressure stage frequency-changeable compressor 1dImprove 1Hz every time to calculate again, directly To satisfaction | ts-tj|≤5min, such as fdImprove to still backlog demand during 80Hz, it is low during Teat pump boiler whole service Frequency-changeable compressor 1 of arbitrarily downgrading keeps a fixed frequency, will improve 1Hz every time on the basis of 80Hz and calculate again, until meeting It is required that;The working frequency for the low-pressure stage frequency-changeable compressor 1 being calculated such as occur is more than the low-pressure stage pressure of Teat pump boiler setting The operation upscale protection frequency of contracting machine 1, then low-pressure stage frequency-changeable compressor 1 is by upscale protection frequency operation;Upscale protection frequency Generally 100Hz;
(e)Controller 5 detects outdoor environment temperature T1, water tank 7 actual temperature T2, in being calculated most preferably according to relational expression I Between temperature T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressor 3b, make the detection of medium temperature sensor 11 in practice Between the optimum interstage temperature T that is calculated of temperatures approach3Value;The working frequency f of hiigh pressure stage frequency-changeable compressor 3bLower limit protection Frequency is 20Hz, and upscale protection frequency is 100Hz, namely works as the working frequency f for occurring needing hiigh pressure stage frequency-changeable compressor 3bIt is low When 20Hz, run, it is necessary to when being higher than 100Hz by 20Hz, run by 100Hz.
In the present embodiment, the working frequency f of each temperature rise section low-pressure stage frequency-changeable compressor 1 of the water tank 7ai, can be right Relational expression VI presses conic section fai=ai2+ bi+c is simplified.
In the present embodiment, the low-limit frequency f of the low-pressure stage frequency-changeable compressor 1dThe scope of initial value be 10- 40Hz, highest frequency fgThe scope of initial value be 60-100Hz.
In the present embodiment, the low-pressure stage frequency-changeable compressor 1 and hiigh pressure stage frequency-changeable compressor 3 can be AC frequency conversion pressure Contracting machine 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, replacement and deformation in the case of departing from the principle of the present invention and objective, this The scope of invention is limited by claim and its equivalent.

Claims (5)

1. a kind of twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimization and control method, twin-stage frequency conversion Two-stage Compression heat Pump water heater includes low-pressure stage frequency-changeable compressor(1), low-pressure stage compressor exhaust temperature sensor(2), hiigh pressure stage frequency conversion compression 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 during Teat pump boiler whole service, it is right Low-pressure stage frequency-changeable compressor(1)With hiigh pressure stage frequency-changeable compressor(3)Working frequency dynamic optimization adjust, make Teat pump boiler whole The total energy consumption of a operational process is minimum;Low-pressure stage frequency-changeable compressor(1)With hiigh pressure stage frequency-changeable compressor(3)Working frequency dynamic Optimal regulation method is as follows:
Teat pump boiler is established with outdoor environment temperature T1, water tank(7)Actual temperature T2Change, with optimal instantaneous trapped energy theory For the heat pump refrigeration system medium temperature T of target3Relational expression I:T3=F(T1,T2);
Establish the instantaneous heating capacity q of Teat pump boiler and outdoor environment temperature T1, water tank(7)Actual temperature T2And low-pressure stage frequency conversion Compressor(1)Working frequency faBetween relational expression II:q=E(T1,T2,fa);Heat-pump hot-water can be obtained according to relational expression II The expression formula III of total heating capacity Q in device whole service time t:
Establish the instantaneous energy consumption p of Teat pump boiler and outdoor environment temperature T1, water tank(7)Actual temperature T2And low-pressure stage frequency conversion pressure Contracting machine(1)Working frequency faBetween relational expression IV:p= F(T1,T2,fa);Teat pump boiler can be obtained according to relational expression IV The expression formula V of total energy consumption P in whole service time t:
User sets the specific moment t with water0With water tank water temperature T, controller(5)Detect current water tank(7)Actual temperature T2, Total heating capacity Q needed for calculating, using Teat pump boiler whole service process total energy consumption P minimums as desired value, according to expression formula III and expression formula V low-pressure stage frequency-changeable compressor during whole service is calculated(1)Working frequency faWith run time t The relational expression VI of change:fa=F (t), Teat pump boiler press VI dynamic regulation low-pressure stage frequency conversion of relational expression during whole service Compressor(1)Working frequency fa
Controller(5)Detect outdoor environment temperature T1, water tank(7)Actual temperature T2, in being calculated most preferably according to relational expression I Between temperature T3, by adjusting hiigh pressure stage frequency-changeable compressor(3)Working frequency fb, make medium temperature sensor(11)The reality of detection The optimal medium temperature T that border medium temperature convergence is calculated3Value.
2. twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimization according to claim 1 and control method, its It is characterized in that during Teat pump boiler whole service, is simplified to obtain one kind to relational expression VI and divide temperature section, discontinuous Low-pressure stage frequency-changeable compressor(1)Working frequency simplify adjusting method, and to hiigh pressure stage frequency-changeable compressor(3)Working frequency Accordingly adjusted, specific method is as follows:
(a)Setting stepwise low-pressure stage frequency-changeable compressor(1)Working frequency fa:According to water tank(7)Set water temperature T and initial water Warm T0Difference, the process of will heat up is divided into n sections, and n >=2, every section of limit of temperature rise is 2-15 DEG C, and preferably temperature rise is 5 DEG C, in each temperature rise Section low-pressure stage frequency-changeable compressor(1)Using different working frequency fai
(b)According to water tank(7)Temperature rise segmentation situation, each temperature rise section low-pressure stage frequency-changeable compressor(1)Working frequency faiBy etc. Difference column distribution, obtains each temperature rise band frequency faiCalculation formula VII:fai=fg-(fg-fd) (i-1)/(n-1), calculation formula VII In, fgFor low-pressure stage frequency-changeable compressor during whole service(1)Highest frequency value;fdFor low-pressure stage during whole service Frequency-changeable compressor(1)Lowest frequency value;I represents corresponding each warming-up section, i=1,2 ..., n since initial heating;
(c)Controller(5)Detect outdoor environment temperature T1, water tank(7)Current actual water temperature T2, the specific of user's setting use water Moment t0With the water tank of setting(7)Use coolant-temperature gage T, and set low-pressure stage frequency-changeable compressor(1)Low-limit frequency fdInitial value For 30Hz, low-pressure stage frequency-changeable compressor(1)Highest frequency fgInitial value be 80Hz;
(d)Controller(5)Calculating current time sets specific with water moment t to user0Between time ts, and according to expression Water tank is calculated in formula III, expression formula V and calculation formula VII(7)Water temperature reach design temperature T operation the time required to tj, such as | ts-tj|≤5min, shows each temperature rise section low-pressure stage frequency-changeable compressor(1)Working frequency setting it is reasonable, low-pressure stage frequency conversion compression Machine 1 is started to work;Such as ts-tj>=5min, then by low-pressure stage frequency-changeable compressor(1)Highest frequency fg1Hz is reduced every time to count again Calculate, until meeting | ts-tj|≤5min, such as fgStill backlog demand when being down to 30Hz, then postpone low-pressure stage frequency-changeable compressor (1)With hiigh pressure stage frequency-changeable compressor(3)Start the time started, low-pressure stage frequency-changeable compressor is pressed in the calculating of its time delay(1)Begin It is calculated eventually with the operation of 30Hz frequencies;Such as ts-tj≤ -5min, then by low-pressure stage frequency-changeable compressor(1)Low-limit frequency fdOften Secondary raising 1Hz is calculated again, until meeting | ts-tj|≤5min, such as fdImprove to still backlog demand during 80Hz, Heat Pump Low-pressure stage frequency-changeable compressor during hydrophone whole service(1)A fixed frequency is kept, will be carried every time on the basis of 80Hz High 1Hz is calculated again, until meeting the requirements;Such as there is the low-pressure stage frequency-changeable compressor being calculated(1)Working frequency be more than The low-pressure stage frequency-changeable compressor of Teat pump boiler setting(1)Operation upscale protection frequency, then low-pressure stage frequency-changeable compressor(1)Press The upscale protection frequency is run;Upscale protection frequency is generally 100Hz;
(e)Controller(5)Detect outdoor environment temperature T1, water tank(7)Actual temperature T2, it is calculated most preferably according to relational expression I Medium temperature T3, by adjusting hiigh pressure stage frequency-changeable compressor(3)Working frequency fb, make medium temperature sensor(11)Detection The optimal medium temperature T that temperatures approach is calculated among actual3Value.
3. twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimization according to claim 2 and control method, its It is further characterized in that the water tank(7)Each temperature rise section low-pressure stage frequency-changeable compressor(1)Working frequency fai, can be to relational expression VI By conic section fai=ai2+ bi+c is simplified.
4. the optimization of twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic and controlling party according to claim 1,2,3 Method, it is characterised in that the low-pressure stage frequency-changeable compressor(1)Low-limit frequency fdThe scope of initial value be 10-40Hz, highest Frequency fgThe scope of initial value be 60-100Hz.
5. the optimization of twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic and controlling party according to claim 1,2,3 Method, it is characterised in that the low-pressure stage frequency-changeable compressor(1)With hiigh pressure stage frequency-changeable compressor(3)It can be AC frequency conversion compressor Or DC speed regulation compressor.
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