CN107763872A - Twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method - Google Patents
Twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method Download PDFInfo
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- CN107763872A CN107763872A CN201711021851.4A CN201711021851A CN107763872A CN 107763872 A CN107763872 A CN 107763872A CN 201711021851 A CN201711021851 A CN 201711021851A CN 107763872 A CN107763872 A CN 107763872A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
Abstract
The present invention relates to a kind of twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method, feature to be：Twin-stage 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 low-pressure stage frequency-changeable compressor and the working frequency optimizing regulation of hiigh pressure stage frequency-changeable compressor, make 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 in whole dynamic heat running, optimize low-pressure stage frequency-changeable compressor and high pressure stage compressor working frequency, make whole service process total energy consumption minimum.
Description
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 dynamic
Heating frequency optimizes 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
Than 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 a kind of " controlling party of frequency conversion two-stage compression heat pump water heater dynamic heat
Method ", the patent No. are ZL201410759807.3 patents of invention；It can be according to ring outside user's heat demand and Teat pump boiler room
The medium temperature of border temperature, water tank temperature regulation low-pressure stage compressor operating frequency and heat pump refrigerating；General principle is to make heat pump
Water heater during whole service each moment instantaneous Energy Efficiency Ratio as close possible to the optimal Energy Efficiency Ratio under the operating condition,
I.e. each moment instantaneous Energy Efficiency Ratio is higher, total during Teat pump boiler whole service under conditions of obtaining identical total heating capacity
Energy consumption is smaller, 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 actually hot
Pump water heater in the process of running, due to the change of operating condition and the change of compressor frequency, causes Teat pump boiler wink
When heating capacity change greatly；Therefore, the frequency conversion double stage heat pump water heater low-pressure stage compressor frequency that aforementioned patent document proposes is adjusted
Section 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 consider
The change of instantaneous heating capacity, it can just make Teat pump boiler whole service process total energy consumption minimum.In addition, existing twin-stage frequency conversion is double
Level Teat pump boiler compressor frequency adjusting method is based primarily upon stable mode of heating, and heat pump is in running is heated, water tank
Interior water is closing heating, i.e., water tank does not put hot water in the process, is also entered without cold water, and water temperature is all the time in rising shape
State.Actually in most cases water tank can be out of external complement cold water, water tank under water temperature meeting constantly when with water by user
Drop, heat pump water tank water temperature in heating process are a dynamic processes risen after falling before, namely dynamic heat, american energy
Portion's Teat pump boiler efficiency test relevant criterion is also to be formulated by dynamic heat.For this twin-stage frequency conversion two-stage compression heat pump hot water
During device dynamic heat, the change of instantaneous heating capacity should be considered, also to consider the situation of water tank Inlet and outlet water, to low-pressure stage pressure
Contracting unit frequency and the regulation of high pressure stage compressor frequency optimization, 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 according to Teat pump boiler
Refrigeration system optimum interstage temperature, hiigh pressure stage frequency-changeable compressor working frequency is adjusted, makes Teat pump boiler whole service process total
Energy consumption is minimum, reaches energy-conservation 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 dynamic heat frequency optimization and control method, twin-stage frequency conversion two-stage compression heat pump water heater 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, control
It is device, tank sensor, water tank, condenser, hiigh pressure stage electric expansion valve, intercooler temperature sensor, intercooler, low
Arbitrarily downgrade electric expansion valve, evaporator and outdoor temperature sensor；It is characterized in that：Twin-stage frequency conversion two-stage compression heat pump water heater enters
Mobile state heating operation, i.e., Teat pump boiler carries out heating operation simultaneously during user's heat water, in whole dynamic heat
In running, to low-pressure stage frequency-changeable compressor and the working frequency optimizing regulation of hiigh pressure stage frequency-changeable compressor, make heat-pump hot-water
The total energy consumption of device whole service process is minimum；The optimization of the working frequency of low-pressure stage frequency-changeable compressor and hiigh pressure stage frequency-changeable compressor is adjusted
Section 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 changes, with optimal instantaneous trapped energy theory
For the heat pump refrigeration system medium temperature T of target3Relational expression I：T3=F(TO,T)；
（c）The working frequency f of setting stepwise low-pressure stage compressor：According to the setting upper limit water temperature T of heat-pump water-heater water tankSWith under
Limit water temperature TXDifference, this temperature difference is divided into n temperature section, n >=2, in each temperature section low-pressure stage frequency-changeable compressor using different
Fragmentary works 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 section fragmentary works frequency fiCalculation formula II：fi=fg-(fg-fd) (i-1)/(n-1), calculate public
In formula II, fgFor the highest frequency value of low-pressure stage frequency-changeable compressor during whole service；fdFor low-pressure stage during whole service
The lowest frequency value of frequency-changeable compressor；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 II obtains each temperature section
Arbitrarily downgrade the fragmentary works 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 III：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 III
Obtained actual operating frequency giWork；
（h）Controller detection outdoor environment temperature TO, water tank actual temperature T, temperature among optimal is calculated according to relational expression I
Spend T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressorb, the actual medium temperature that medium temperature sensor detects is become
The optimum interstage temperature T being closely calculated3Value；
（i）Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature such as obtained by formula III
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；Similarly, run when the operating frequency requirements of hiigh pressure stage frequency-changeable compressor are less than 20Hz by 20Hz,
When requiring to be more than 100Hz, run by 100Hz.
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 IV：fi=ai2+ bi+c, a in formula IV, b, c are to be by test obtained conic section
Number.
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, its major advantage is the present invention：Make twin-stage frequency conversion two-stage compression heat pump water heater whole
In dynamic heat running, optimize low-pressure stage frequency-changeable compressor and high pressure stage compressor working frequency, make whole service process
Total energy consumption is minimum.
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；
Fig. 2 is water tank temperature change signal during the twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat that the present invention is implemented
Figure.
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, twin-stage frequency conversion two-stage compression heat pump water heater includes low-pressure stage frequency-changeable compressor 1, low-pressure stage frequency conversion
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, water tank 7, condenser 8, hiigh pressure stage electric expansion valve 9, intercooler temperature sensor 10, intercooler
11st, low-pressure stage electric expansion valve 12, evaporator 13 and outdoor temperature sensor 14；As shown in Fig. 2 Teat pump boiler dynamic heat
Process 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 outer
Portion supplements cold water, and water temperature starts to reduce in water tank 7, and Teat pump boiler also begins to heating operation, due to being more than with the heat of hot water
Heat pump heating capacity, water temperature continues to reduce in water tank 7, when water temperature reaches design temperature lower limit TXWhen, user stops using water, and this is constantly
Between be t2, because Teat pump boiler only heats, user does not have to heat, 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 optimal regulation method of low-pressure stage frequency-changeable compressor 1 and hiigh pressure stage frequency-changeable compressor 3 is as follows：
Twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency 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-changeable compressor 3, height
Arbitrarily downgrade compressor exhaust temperature sensor 4, controller 5, tank sensor 6, water tank 7, condenser 8, hiigh pressure stage electric expansion valve
9th, intercooler temperature sensor 10, intercooler 11, low-pressure stage electric expansion valve 12, evaporator 13 and outdoor temperature pass
Sensor 14；Twin-stage frequency conversion two-stage compression heat pump water heater carries out dynamic heat operation, i.e., the Heat Pump during user's heat water
Hydrophone carries out heating operation simultaneously, in whole dynamic heat running, to low-pressure stage frequency-changeable compressor 1 and hiigh pressure stage frequency conversion
The working frequency optimizing regulation of compressor 3, make the total energy consumption of Teat pump boiler whole service process minimum；Low-pressure stage frequency conversion is compressed
The working frequency optimal regulation method of machine 1 and hiigh pressure stage frequency-changeable compressor 3 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, water tank 7 actual temperature T changes, with optimal instantaneous Energy Efficiency Ratio
EER is the heat pump refrigeration system medium temperature T of target3Relational expression I：T3=F(TO,T)；
（c）The working frequency f of setting stepwise low-pressure stage compressor 1：According to the setting upper limit water temperature T of heat-pump water-heater water tank 7SWith
Lower limit water temperature TXDifference, this temperature difference is divided into n temperature section, n >=2, in each temperature section low-pressure stage frequency-changeable compressor 1 using not
Same fragmentary works 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 section fragmentary works frequency fiCalculation formula II：fi=fg-(fg-fd) (i-1)/(n-1), calculate
In formula II, fgFor low-pressure stage frequency-changeable compressor during whole service（1）Highest frequency value；fdDuring whole service
The lowest frequency value of low-pressure stage frequency-changeable compressor 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, according to corresponding to calculation formula II obtains each temperature section
The fragmentary works frequency f of low-pressure stage 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 III：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 III
Obtained actual operating frequency giWork；
（h）Controller 5 detects outdoor environment temperature TO, water tank 7 actual temperature T, optimal centre is calculated according to relational expression I
Temperature T3, by the working frequency f for adjusting hiigh pressure stage frequency-changeable compressor 3b, make medium temperature sensor 11 detect actual centre
The optimum interstage temperature T that temperatures approach is calculated3Value；
（i）Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature such as obtained by formula III
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；Similarly, 20Hz is pressed when the operating frequency requirements of hiigh pressure stage frequency-changeable compressor 3 are less than 20Hz
Operation, when requiring to be more than 100Hz, is run by 100Hz.
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 IV：fi=ai2+ bi+c, a in formula IV, b, c are to be by test obtained conic section
Number.
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 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 twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method, twin-stage frequency conversion twin-stage pressure
Contracting Teat pump boiler includes low-pressure stage frequency-changeable compressor（1）, low-pressure stage compressor exhaust temperature sensor（2）, hiigh pressure stage frequency conversion
Compressor（3）, high pressure stage compressor exhaust gas temperature sensor（4）, controller（5）, tank sensor（6）, water tank（7）, condensation
Device（8）, hiigh pressure stage electric expansion valve（9）, intercooler temperature sensor（10）, intercooler（11）, low-pressure stage electronics
Expansion valve（12）, evaporator（13）And outdoor temperature sensor（14）；It is characterized in that：Twin-stage frequency conversion two-stage compression heat pump hot water
Device carries out dynamic heat operation, i.e., Teat pump boiler carries out heating operation simultaneously during user's heat water, in whole dynamic
Heat in running, to low-pressure stage frequency-changeable compressor（1）With hiigh pressure stage frequency-changeable compressor（3）Working frequency optimizing regulation,
Make the total energy consumption of Teat pump boiler whole service process minimum；Low-pressure stage frequency-changeable compressor（1）With hiigh pressure stage frequency-changeable compressor（3）
Working frequency optimal regulation 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 changes, with optimal instantaneous trapped energy theory
For the heat pump refrigeration system medium temperature T of target3Relational expression I：T3=F(TO,T)；
Setting stepwise low-pressure stage compressor（1）Working frequency f：According to heat-pump water-heater water tank（7）Setting upper limit water temperature TSWith
Lower limit water temperature 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 section fragmentary works frequency fiCalculation formula II：fi=fg-(fg-fd) (i-1)/(n-1), calculate
In formula II, fgFor low-pressure stage frequency-changeable compressor during whole service（1）Highest frequency value；fdDuring whole service
Low-pressure stage frequency-changeable compressor（1）Lowest frequency value；I represent since initial heating corresponding to each warming-up section, 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 II obtains each temperature section
Arbitrarily downgrade frequency-changeable compressor（1）Fragmentary works 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 III：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 III
Obtained actual operating frequency giWork；
Controller（5）Detect outdoor environment temperature TO, water tank（7）Actual temperature T, optimal centre is calculated according to relational expression I
Temperature T3, by adjusting hiigh pressure stage frequency-changeable compressor（3）Working frequency fb, make medium temperature sensor（11）The reality of detection
The optimum interstage temperature T that medium temperature convergence is calculated3Value；
Because the frequency range of frequency-changeable compressor steady operation is generally 20Hz-100Hz, each temperature section such as obtained by formula III 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；Similarly, hiigh pressure stage frequency-changeable compressor（3）Operating frequency requirements press when being less than 20Hz
20Hz is run, and when requiring to be more than 100Hz, is run by 100Hz.
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 IV：fi=ai2+ bi+c, a in formula IV, b, c are the coefficient by testing obtained conic section.
3. twin-stage frequency conversion two-stage compression heat pump water heater frequency dynamic optimization according to claim 1 and control method, its
It is characterised by the low-pressure stage frequency-changeable compressor（1）With hiigh pressure stage frequency-changeable compressor（3）It can be AC frequency conversion compressor or straight
Flow adjustable speed compressors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711021851.4A CN107763872A (en) | 2017-10-27 | 2017-10-27 | Twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method |
| PCT/CN2017/115118 WO2019080276A1 (en) | 2017-10-27 | 2017-12-08 | Dynamic heating frequency optimization and control method for two-stage variable-frequency and two-stage compression heat pump water heater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711021851.4A CN107763872A (en) | 2017-10-27 | 2017-10-27 | Twin-stage frequency conversion two-stage compression heat pump water heater dynamic heat frequency optimization and control method |
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| CN107763872A true CN107763872A (en) | 2018-03-06 |
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| WO (1) | WO2019080276A1 (en) |
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| CN109028573A (en) * | 2018-06-05 | 2018-12-18 | 广东芬尼克兹节能设备有限公司 | Teat pump boiler compressor operating control method for frequency and system |
| CN111174388A (en) * | 2020-01-03 | 2020-05-19 | 珠海格力电器股份有限公司 | Operation control method and device, storage medium and multi-split system |
| CN113251698A (en) * | 2021-04-29 | 2021-08-13 | 太原理工大学 | Large-temperature-difference multistage compression mixed working medium heat pump system suitable for recovering waste heat of power plant |
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| CN109028573A (en) * | 2018-06-05 | 2018-12-18 | 广东芬尼克兹节能设备有限公司 | Teat pump boiler compressor operating control method for frequency and system |
| CN109028573B (en) * | 2018-06-05 | 2020-09-01 | 广东芬尼克兹节能设备有限公司 | Method and system for controlling working frequency of heat pump water heater compressor |
| CN111174388A (en) * | 2020-01-03 | 2020-05-19 | 珠海格力电器股份有限公司 | Operation control method and device, storage medium and multi-split system |
| CN111174388B (en) * | 2020-01-03 | 2020-12-15 | 珠海格力电器股份有限公司 | Operation control method and device, storage medium and multi-split system |
| CN113251698A (en) * | 2021-04-29 | 2021-08-13 | 太原理工大学 | Large-temperature-difference multistage compression mixed working medium heat pump system suitable for recovering waste heat of power plant |
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| WO2019080276A1 (en) | 2019-05-02 |
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