CN107676973B - Dynamic heating frequency optimization and control method for variable-frequency two-stage compression heat pump water heater - Google Patents
Dynamic heating frequency optimization and control method for variable-frequency two-stage compression heat pump water heater Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to a dynamic heating frequency optimization and control method of a variable-frequency two-stage compression heat pump water heater, which is characterized by comprising the following steps: the variable-frequency two-stage compression heat pump water heater performs dynamic heating operation, namely the heat pump water heater performs heating operation simultaneously in the process of using hot water by a user, the working frequency of the low-pressure stage variable-frequency compressor is optimized and adjusted in the whole dynamic heating operation process, and meanwhile, the opening degrees of the low-pressure stage electronic expansion valve and the high-pressure stage electronic expansion valve of the refrigeration system are correspondingly controlled, so that the total energy consumption in the whole operation process of the heat pump water heater is minimum. Its main advantage is: in the dynamic heating process of the variable-frequency two-stage compression heat pump water heater, the working frequency of the low-pressure-stage variable-frequency compressor is optimized, and meanwhile, the opening degrees of the low-pressure-stage electronic expansion valve and the high-pressure-stage electronic expansion valve are controlled by taking the optimal energy efficiency ratio as a target, so that the total energy consumption in the whole dynamic heating operation process is minimized.
Description
Technical Field
The invention relates to a control method of a heat pump water heater, in particular to a dynamic heating frequency optimization and control method of a variable-frequency two-stage compression heat pump water heater.
Background
The double-stage compression heat pump water heater can prepare high-temperature hot water at a lower outdoor environment temperature. At present, a low-pressure stage variable-frequency compressor of a two-stage compression heat pump water heater is generally a variable-frequency compressor, and a high-pressure stage is a fixed-frequency compressor. The working frequency of the low-pressure-stage variable-frequency compressor and the intermediate temperature of the heat pump refrigerating system have great influence on the heating capacity and the energy consumption of the heat pump water heater in the operation process of the variable-frequency two-stage compression heat pump water heater; chinese patent announces 'a control method for dynamic heating of a variable-frequency two-stage compression heat pump water heater', the patent number is ZL201410759807.3 patent; the working frequency of the low-pressure-stage variable-frequency compressor and the intermediate temperature of the heat pump refrigeration can be adjusted according to the heat demand of a user, the outdoor environment temperature of the heat pump water heater and the temperature of the water tank; the basic principle is that the instantaneous energy efficiency ratio of the heat pump water heater at each moment in the whole operation process is made to be as close as possible to the optimal energy efficiency ratio under the operation condition, namely the higher the instantaneous energy efficiency ratio at each moment is, the lower the total energy consumption of the heat pump water heater in the whole operation process under the condition of obtaining the same total heating capacity, but the condition that the instantaneous heating capacities of the heat pumps in the whole operation process are required to be equal is established. In fact, in the running process of the heat pump water heater, due to the change of the running working condition and the change of the frequency of the compressor, the instantaneous heating capacity of the heat pump water heater changes greatly; therefore, the frequency adjusting method for the low-pressure stage variable-frequency compressor of the variable-frequency two-stage heat pump water heater proposed by the aforementioned patent document still needs to be optimized. In addition, the existing frequency conversion two-stage heat pump water heater compressor frequency adjusting method is mainly based on a stable heating mode, water in a water tank is heated in a closed mode in the heating operation process of a heat pump, namely the water tank does not release hot water or cold water enters the water tank in the heating operation process, and the water temperature is always in a rising state. In fact, in most cases, cold water is supplemented from the outside into the water tank when a user uses water, the water temperature in the water tank is continuously reduced, the water temperature in the water tank is a dynamic process that the water temperature in the water tank is reduced firstly and then increased in the heating process of the heat pump, namely dynamic heating is also achieved, and relevant standards of the energy efficiency test of the heat pump water heater in the U.S. department of energy are also established according to dynamic heating. Therefore, in the dynamic heating process of the variable-frequency two-stage compression heat pump water heater, the frequency of the low-pressure stage variable-frequency compressor and the heat pump refrigerating system are optimally controlled by considering the change of the instantaneous heating capacity and the condition of water inlet and outlet of the water tank, so that the total energy consumption of the whole operation process of the heat pump water heater can be minimized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a dynamic heating frequency optimization and control method of a variable-frequency two-stage compression heat pump water heater, which can optimize the working frequency of a low-pressure stage variable-frequency compressor and simultaneously adjust the opening degrees of a low-pressure stage electronic expansion valve and a high-pressure stage electronic expansion valve in the dynamic heating process of the heat pump water heater according to the outdoor environment temperature of the heat pump water heater, the temperature of a water tank and the water consumption condition of a user, so that the total energy consumption of the whole operation process of the heat pump water heater is minimized, and the aim of saving energy is.
In order to achieve the above purpose, the invention is realized by the method, the method is a dynamic heating frequency optimization and control method for the variable-frequency two-stage compression heat pump water heater, the variable-frequency two-stage compression heat pump water heater comprises a low-pressure stage variable-frequency compressor, a low-pressure stage variable-frequency compressor exhaust temperature sensor, a high-pressure stage fixed-frequency compressor, a high-pressure stage compressor exhaust temperature sensor, a controller, a water tank sensor, a water tank, a condenser, a high-pressure stage electronic expansion valve, an intercooler temperature sensor, an intercooler, a low-pressure stage electronic expansion valve, an evaporator and an outdoor temperature sensor; the method is characterized in that: the variable-frequency two-stage compression heat pump water heater performs dynamic heating operation, namely the heat pump water heater performs heating operation simultaneously in the process of using hot water by a user, the working frequency of the low-pressure stage variable-frequency compressor is optimized and adjusted in the whole dynamic heating operation process, and meanwhile, the opening degrees of the low-pressure stage electronic expansion valve and the high-pressure stage electronic expansion valve of the refrigeration system are correspondingly controlled, so that the total energy consumption of the whole operation process of the heat pump water heater is minimum; the working frequency optimization and regulation method of the low-pressure stage variable-frequency compressor and the opening control methods of the low-pressure stage electronic expansion valve and the high-pressure stage electronic expansion valve are as follows:
(a) determining dynamic heating reference working conditions of heat pump water heater, including outdoor environment temperature TWAnd relative humidity phi, set upper limit temperature T of water tankSLower limit temperature TXThe temperature of the cold water and the temperature of the hot water, and the rated water consumption;
(b) establishing outdoor temperature T of heat pump water heaterOThe actual temperature T of the water tank and the working frequency f of the low-pressure-stage variable-frequency compressor are changed, and the opening combination table of the low-pressure-stage electronic expansion valve and the high-pressure-stage electronic expansion valve takes the optimal instantaneous energy efficiency ratio EER as a target;
(c) setting the working frequency f of the low-pressure-stage variable-frequency compressor in a segmented manner: according to the set upper limit water temperature T of the water tankSWith lower limit water temperature TXThe difference between the two temperatures is divided into n temperature sections, n is larger than or equal to 2, and at each temperatureThe low-pressure stage variable-frequency compressor adopts different sectional working frequencies fi；
(d) According to the temperature difference segmentation condition of the water tank, the segmentation working frequency f of the low-pressure-level variable-frequency compressor in each temperature segmentiDistributed according to an arithmetic progression to obtain the frequency f of each temperature rise sectioniFormula i: f. ofi=fg-(fg-fd) (i-1)/(n-1), calculating f in formula IgThe highest frequency value of the low-pressure variable frequency compressor in the whole operation process is obtained; f. ofdThe lowest frequency value of the low-pressure variable frequency compressor in the whole operation process is obtained; i represents the corresponding temperature rise section from the initial heating, i =1, 2.. times.n;
(e) the maximum frequency f of the low-pressure-level variable-frequency compressor under the reference working condition is obtained through experiments by taking the minimum total energy consumption in the whole dynamic operation process of the heat pump water heater as a targetgAnd the lowest frequency fdObtaining the working frequency f of the low-pressure-stage variable-frequency compressor corresponding to each temperature section according to the calculation formula Ii；
(f) When the actual operation condition of the heat pump water heater deviates from the reference condition, the actual outdoor environment temperature T is usedOTo correct the sectional working frequency f of the low-pressure stage variable-frequency compressor corresponding to each temperature section of the water tanki(ii) a Actual working frequency g of low-pressure-level variable-frequency compressor under actual operating conditioniAccording to formula II: gi=kfiCorrected for different outdoor ambient temperatures TOCorresponding to different k, obtaining the k through experiments;
(g) in the process of lowering and raising the water temperature of the water tank, the working frequency of the low-pressure stage variable-frequency compressor is calculated according to the formula II to obtain the actual working frequency giWorking;
(h) because the frequency range of the stable operation of the frequency conversion compressor is generally 20Hz-100Hz, the actual operating frequency g of the low-pressure stage frequency conversion compressor in each temperature section is obtained according to the formula IIiThe temperature section less than 20Hz appears in the middle, and the working frequency of the low-pressure stage variable frequency compressor in the temperature section runs at 20 Hz; if the temperature section is larger than 100Hz, the working frequency of the low-pressure-stage variable-frequency compressor in the temperature section is operated according to 100 Hz;
(i) in the operation process of the heat pump water heater, the controller is used for controlling the water heater to work according to the outdoor environment temperature TOAnd the actual temperature T of the water tank and the working frequency f of the low-pressure stage variable-frequency compressor, and the opening degrees of the low-pressure stage electronic expansion valve and the high-pressure stage electronic expansion valve are adjusted according to the opening combination table of the low-pressure stage electronic expansion valve and the high-pressure stage electronic expansion valve.
In the technical scheme, the segmented working frequency f of the low-pressure-stage variable-frequency compressor is arranged at each temperature rise section of the water tankiCan be distributed according to a quadratic curve, namely formula III: f. ofi=ai2+ bi + c, formula iii a, b, c are coefficients of the quadratic curve obtained by experiment.
In the technical scheme, the low-pressure-stage variable-frequency compressor is an alternating-current variable-frequency compressor or a direct-current speed-regulating compressor.
Compared with the prior art, the invention has the main advantages that: in the dynamic heating process of the variable-frequency two-stage compression heat pump water heater, the working frequency of the low-pressure-stage variable-frequency compressor is optimized, and meanwhile, the opening degrees of the low-pressure-stage electronic expansion valve and the high-pressure-stage electronic expansion valve are controlled by taking the optimal energy efficiency ratio as a target, so that the total energy consumption in the whole dynamic heating operation process is minimized.
Drawings
FIG. 1 is a schematic diagram of a variable frequency two-stage compression heat pump water heater system embodying the present invention;
fig. 2 is a schematic diagram of the temperature change of the water tank in the dynamic heating process of the variable-frequency two-stage compression heat pump water heater implemented by the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the frequency conversion two-stage compression heat pump water heater comprises a low-pressure stage frequency conversion compressor 1, a low-pressure stage frequency conversion compressor exhaust temperature sensor 2, a high-pressure stage fixed-frequency compressor 3, a high-pressure stage compressor exhaust temperature sensor 4, a controller 5, a water tank sensor 6, a water tank 7, a condenser 8, a high-pressure stage electronic expansion valve 9, an intermediate stage electronic expansion valveA cooler 10, an intercooler temperature sensor 11, a low-pressure stage electronic expansion valve 12, an evaporator 13 and an outdoor temperature sensor 14; as shown in fig. 2, the dynamic heating process of the heat pump water heater is as follows: the water temperature of the water tank 7 at the beginning is the set upper limit temperature TSFrom time t1When a user starts to use hot water, cold water is supplemented from the outside into the water tank, the water temperature in the water tank 7 starts to be reduced, the heat pump water heater also starts to heat and run, the water temperature in the water tank 7 continues to be reduced because the heat of the hot water is greater than the heating capacity of the heat pump, and when the water temperature reaches the set temperature lower limit TXWhen the user stops using water, the time is t2Because the heat pump water heater only heats, a user does not need hot water, and the water temperature begins to rise until the time t3Reaching the upper limit T of the set water temperatureSIn time, the heat pump water heater stops working for time t1To t3A complete dynamic heating process for the heat pump water heater; in the whole dynamic heating process, the working frequency dynamic optimization adjusting method of the low-pressure stage variable-frequency compressor 1 and the opening control methods of the low-pressure stage electronic expansion valve 12 and the high-pressure stage electronic expansion valve 9 of the refrigeration system are as follows:
(a) determining dynamic heating reference working conditions of heat pump water heater, including outdoor environment temperature TWAnd relative humidity phi, set upper limit temperature T of the water tank 7SLower limit temperature TXThe temperature of the cold water and the temperature of the hot water, and the rated water consumption;
(b) establishing outdoor temperature T of heat pump water heaterOThe actual temperature T of the water tank 7 and the working frequency f of the low-pressure-stage variable-frequency compressor 1 are changed, and the opening degree combination table of the low-pressure-stage electronic expansion valve 12 and the high-pressure-stage electronic expansion valve 9 takes the optimal instantaneous energy efficiency ratio EER as a target;
(c) setting the working frequency f of the low-pressure-stage variable-frequency compressor 1 in a segmented manner: according to the set upper limit water temperature T of the water tank 7SWith lower limit water temperature TXThe difference is divided into n temperature sections, n is more than or equal to 2, and different sectional working frequencies f are adopted by the low-pressure-level variable-frequency compressor 1 in each temperature sectioni；
(d) According to the temperature difference segmentation condition of the water tank 7, the segmentation working frequency f of the low-pressure-level variable-frequency compressor 1 of each temperature segmentiDistributed according to an arithmetic progression to obtain the frequency f of each temperature rise sectioniFormula i: f. ofi=fg-(fg-fd) (i-1)/(n-1), calculating f in formula IgThe highest frequency value of the low-pressure-level variable-frequency compressor 1 in the whole operation process is obtained; f. ofdThe lowest frequency value of the low-pressure variable frequency compressor 1 in the whole operation process is obtained; i represents the corresponding temperature rise section from the initial heating, i =1, 2.. times.n;
(e) the highest frequency f of the low-pressure-level variable-frequency compressor 1 under the reference working condition is obtained through experiments by taking the minimum total energy consumption in the whole dynamic operation process of the heat pump water heater as a targetgAnd the lowest frequency fdObtaining the working frequency f of the low-pressure-stage variable-frequency compressor 1 corresponding to each temperature section according to the calculation formula Ii；
(f) When the actual operation condition of the heat pump water heater deviates from the reference condition, the actual outdoor environment temperature T is usedOTo correct the sectional working frequency f of the low-pressure stage variable-frequency compressor 1 corresponding to each temperature section of the water tank 7i(ii) a Actual working frequency g of low-pressure-level variable-frequency compressor 1 under actual operating conditioniAccording to formula II: gi=kfiCorrected for different outdoor ambient temperatures TOCorresponding to different k, obtaining the k through experiments;
(g) in the process of the water temperature falling and rising of the water tank 7, the working frequency of the low-pressure stage variable-frequency compressor 1 is calculated according to the formula II to obtain the actual working frequency giWorking;
(h) because the frequency range of the stable operation of the inverter compressor is generally 20Hz-100Hz, the actual operating frequency g of the low-pressure-stage inverter compressor 1 in each temperature section is obtained according to the formula IIiThe temperature section less than 20Hz appears in the middle, and the working frequency of the low-pressure stage variable-frequency compressor 1 in the temperature section runs at 20 Hz; if the temperature section is larger than 100Hz, the working frequency of the low-pressure-stage variable-frequency compressor 1 in the temperature section is operated according to 100 Hz;
(i) in the operation process of the heat pump water heater, the controller 5 is used for controlling the outdoor environment temperature TOActual temperature T of water tank 7 and working frequency f of low-pressure-level variable-frequency compressor 1 according to low-pressure-level electronic expansionThe opening combination meter of the expansion valve 12 and the high-pressure electronic expansion valve 9 regulates the opening of the low-pressure electronic expansion valve 12 and the high-pressure electronic expansion valve 9.
In the present embodiment, the segmented operating frequency f of the low-pressure stage variable frequency compressor 1 at each temperature rise segment of the water tank 7iCan be distributed according to a quadratic curve, namely formula III: f. ofi=ai2+ bi + c, formula iii a, b, c are coefficients of the quadratic curve obtained by experiment.
In the present embodiment, the low-pressure stage variable frequency compressor 1 is an ac variable frequency compressor or a dc variable speed compressor.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A dynamic heating frequency optimization and control method of a variable-frequency two-stage compression heat pump water heater comprises a low-pressure stage variable-frequency compressor (1), a low-pressure stage variable-frequency compressor exhaust temperature sensor (2), a high-pressure stage fixed-frequency compressor (3), a high-pressure stage compressor exhaust temperature sensor (4), a controller (5), a water tank sensor (6), a water tank (7), a condenser (8), a high-pressure stage electronic expansion valve (9), an intercooler temperature sensor (10), an intercooler (11), a low-pressure stage electronic expansion valve (12), an evaporator (13) and an outdoor temperature sensor (14); the method is characterized in that: the variable-frequency two-stage compression heat pump water heater performs dynamic heating operation, namely the heat pump water heater performs heating operation simultaneously in the process of using hot water by a user, the working frequency of the low-pressure stage variable-frequency compressor (1) is optimized and adjusted in the whole dynamic heating operation process, and meanwhile, the opening degrees of the low-pressure stage electronic expansion valve (12) and the high-pressure stage electronic expansion valve (9) of the refrigeration system are correspondingly controlled, so that the total energy consumption of the whole operation process of the heat pump water heater is minimized; the working frequency optimization and adjustment method of the low-pressure-stage variable-frequency compressor (1) and the opening control methods of the low-pressure-stage electronic expansion valve (12) and the high-pressure-stage electronic expansion valve (9) are as follows:
(a) determining dynamic heating reference working conditions of heat pump water heater, including outdoor environment temperature TWAnd relative humidity phi, set upper limit temperature T of the water tank (7)SLower limit temperature TXThe temperature of the cold water and the temperature of the hot water, and the rated water consumption;
(b) establishing outdoor temperature T of heat pump water heaterOThe actual temperature T of the water tank (7) and the working frequency f of the low-pressure-stage variable-frequency compressor (1) are changed, and the opening combination table of the low-pressure-stage electronic expansion valve (12) and the high-pressure-stage electronic expansion valve (9) takes the optimal instantaneous energy efficiency ratio EER as a target;
(c) setting the working frequency f of the low-pressure-stage variable-frequency compressor (1) in a segmented manner: according to the set upper limit water temperature T of the water tank (7)SWith lower limit water temperature TXThe difference is divided into n temperature sections, n is more than or equal to 2, and different sectional working frequencies f are adopted by the low-pressure-stage variable-frequency compressor (1) in each temperature sectioni；
(d) According to the temperature difference segmentation condition of the water tank (7), the segmentation working frequency f of the low-pressure-stage variable-frequency compressor (1) of each temperature segmentiDistributed according to an arithmetic progression to obtain the frequency f of each temperature rise sectioniFormula i: f. ofi=fg-(fg-fd) (i-1)/(n-1), calculating f in formula IgThe highest frequency value of the low-pressure variable frequency compressor (1) in the whole operation process is obtained; f. ofdThe lowest frequency value of the low-pressure variable frequency compressor (1) in the whole operation process is obtained; i represents the corresponding temperature rise section from the initial heating, i =1, 2.. times.n;
(e) the highest frequency f of the low-pressure-level variable-frequency compressor (1) under the reference working condition is obtained through experiments by taking the minimum total energy consumption in the whole dynamic operation process of the heat pump water heater as a targetgAnd the lowest frequency fdObtaining the working frequency f of the low-pressure-stage variable-frequency compressor (1) corresponding to each temperature section according to the calculation formula Ii；
(f) When the actual operation condition of the heat pump water heater deviates from the reference condition, the actual outdoor environment is determinedTemperature TOTo correct the sectional working frequency f of the low-pressure-stage variable-frequency compressor (1) corresponding to each temperature section of the water tank (7)i(ii) a Actual working frequency g of low-pressure-level variable-frequency compressor (1) under actual operating conditioniAccording to formula II: gi=kfiCorrected for different outdoor ambient temperatures TOCorresponding to different k, obtaining the k through experiments;
(g) in the process of lowering and raising the water temperature of the water tank (7), the working frequency of the low-pressure stage variable-frequency compressor (1) is calculated according to the formula II to obtain the actual working frequency giWorking;
(h) because the frequency range of the stable work of the variable frequency compressor is 20Hz-100Hz, the actual working frequency g of the low-pressure-stage variable frequency compressor (1) in each temperature section is obtained according to the formula IIiThe temperature section less than 20Hz appears in the low-pressure stage variable frequency compressor (1), and the working frequency of the low-pressure stage variable frequency compressor is operated at 20 Hz; if the temperature section is larger than 100Hz, the working frequency of the low-pressure-stage variable-frequency compressor (1) in the temperature section is operated according to 100 Hz;
in the operation process of the heat pump water heater, the controller (5) is used for controlling the outdoor environment temperature TOThe actual temperature T of the water tank (7) and the working frequency f of the low-pressure-stage variable-frequency compressor (1) are adjusted according to the opening combination table of the low-pressure-stage electronic expansion valve (12) and the high-pressure-stage electronic expansion valve (9).
2. The method for optimizing and controlling the dynamic heating frequency of a variable-frequency two-stage compression heat pump water heater according to claim 1, wherein the segmented working frequency f of the low-pressure stage variable-frequency compressor (1) at each temperature rising stage of the water tank (7)iCan be distributed according to a quadratic curve, namely formula III: f. ofi=ai2+ bi + c, formula iii a, b, c are coefficients of the quadratic curve obtained by experiment.
3. The dynamic heating frequency optimization and control method of the variable-frequency two-stage compression heat pump water heater according to claim 1, wherein the low-pressure stage variable-frequency compressor (1) is an alternating-current variable-frequency compressor or a direct-current variable-speed compressor.
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