CN108826772B - Defrosting control method and system - Google Patents
Defrosting control method and system Download PDFInfo
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- CN108826772B CN108826772B CN201810416633.9A CN201810416633A CN108826772B CN 108826772 B CN108826772 B CN 108826772B CN 201810416633 A CN201810416633 A CN 201810416633A CN 108826772 B CN108826772 B CN 108826772B
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a defrosting control method, a defrosting control system, computer equipment and a computer readable storage medium. The defrosting control method comprises the following steps: responding to a defrosting instruction, and searching a defrosting frequency according to the outdoor environment temperature and the water temperature; and operating a defrosting mode, and controlling the compressor to start at a defrosting frequency. The invention avoids the condition that the compressor can only operate in a defrosting mode according to a fixed operation frequency during defrosting, frosting is less in a high water temperature area, and a larger defrosting capacity is output, so that energy waste is caused.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a defrosting control method, a defrosting control system, computer equipment and a computer readable storage medium.
Background
When an existing heat pump water heater system defrosts, the operation frequency of a compressor of the existing heat pump water heater system is fixed, that is, the output capacity of the compressor is relatively stable, but considering that the frosting thickness of an outdoor heat exchanger is different under different conditions, that is, the heat required by defrosting is different, therefore, if the defrosting frequency is kept unchanged, the conditions of small defrosting capacity output and insufficient defrosting can occur, the conditions of large defrosting capacity output and energy waste can also occur, and even the pressure is changed too fast, so that the reliability of the system is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the present invention is to propose a defrosting control method.
In a second aspect of the present invention, a defrosting control system is provided.
A third aspect of the present invention is to provide a computer device.
A fourth aspect of the present invention is to provide a computer-readable storage medium.
In view of the above, according to a first aspect of the present invention, there is provided a defrosting control method for a heat pump water heater system, wherein the heat pump water heater system includes a compressor and a water tank, the defrosting control method specifically includes: responding to a defrosting instruction, and searching a defrosting frequency according to the outdoor environment temperature and the water temperature; and operating a defrosting mode, and controlling the compressor to start at a defrosting frequency.
The defrosting control method provided by the invention can respond to a defrosting instruction, determine the defrosting frequency by combining the outdoor environment temperature and the water temperature, and control the compression to operate the defrosting mode according to the determined defrosting frequency. Because under different outdoor ambient temperature and different water temperature, the frosting thickness of outdoor heat exchanger is different, that is to say the required heat of dissolving the frost is different, and the system low pressure side can carry out the heat transfer with water tank hot water when changing the frost simultaneously, absorbs the heat evaporation for the heat-releasing capacity of condensation side promotes greatly, and at this change frost in-process, it not only has the relation with compressor operating frequency to change the frost ability, also has the relation with hydrothermal temperature. Therefore, if the compressor can only operate the defrosting mode according to the fixed operation frequency during defrosting, the condition that little frosting is generated in a high water temperature area and a larger defrosting capacity is output is easily generated, energy waste is caused, in addition, because the temperature of the pipe of the heat exchanger in the high water temperature area is increased too fast during defrosting, the temperature change cannot be detected in time by a sensor, the pressure of the heat exchanger is increased rapidly in a certain time period, and the heat pump water heater system is easily unstable, the defrosting frequency of the compressor is changed in the defrosting control method of the invention, the problem caused by defrosting by using the fixed frequency is effectively avoided, the frosting condition is pre-judged according to the outdoor environment temperature and the water temperature, the most suitable defrosting frequency of the compressor is determined according to the frosting condition, the defrosting effect is ensured, the energy waste is reduced, and the balance of the defrosting effect, the time and the system reliability is ensured, the product quality is improved.
In addition, according to the defrosting control method in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, preferably, the operation of searching for the defrosting frequency according to the outdoor ambient temperature and the water temperature includes: searching a corresponding temperature interval according to the outdoor environment temperature; acquiring a defrosting frequency curve corresponding to the temperature interval, wherein the abscissa of the defrosting frequency curve corresponds to the water temperature and the ordinate corresponds to the defrosting frequency; and searching the defrosting frequency according to the defrosting frequency curve and the water temperature.
In the technical scheme, the corresponding temperature interval is searched according to the outdoor environment temperature, and then the corresponding defrosting frequency curve is obtained according to different temperature intervals, wherein the defrosting frequency curve is a relation curve taking the water temperature as an abscissa and the defrosting frequency as an ordinate. Because the degree of difficulty of outdoor unit frosting is different under different outdoor environment temperatures, and the frosting thickness under the same outdoor environment temperature changes along with the water temperature, different defrosting frequency curves are set in different temperature intervals, a defrosting frequency curve is determined firstly, then the corresponding defrosting frequency is determined by using the horizontal and vertical coordinates of the selected defrosting frequency curve, and then the compressor is controlled to operate a defrosting mode according to the determined defrosting frequency, so that the searching is convenient.
In any of the above technical solutions, preferably, the number of the temperature intervals is at least two, and all the temperature intervals do not have an intersection; all temperature intervals are divided into an easy-frosting interval and an uneasy-frosting interval, the highest temperature corresponding to the easy-frosting interval is lower than the lowest temperature corresponding to the uneasy-frosting interval, and the lowest frosting frequency in all frosting frequency curves corresponding to the easy-frosting interval is greater than the highest frosting frequency in all frosting frequency curves corresponding to the uneasy-frosting interval.
In the technical scheme, the temperature intervals are established, the frosting difficulty is represented by the temperature intervals, and all the temperature intervals have no intersection, so that the temperature interval to which the detected outdoor environment temperature belongs can be clear, and the control process is reliable. The corresponding frosting area can be directly determined by comparing the outdoor environment temperature, the heat of the water vapor in the air in the low-temperature environment is taken away after the water vapor is contacted with an evaporator in an outdoor unit, phase change is easy to occur, frosting is easy to occur on the surface of the evaporator, the defrosting requirement is correspondingly larger, the temperature interval is divided into an easy frosting interval and an difficult frosting interval, the highest temperature corresponding to the easy frosting interval is lower than the lowest temperature corresponding to the difficult frosting interval, the temperature interval can be divided reasonably, meanwhile, the lowest defrosting frequency in all defrosting frequency curves corresponding to the easy frosting interval is limited to be larger than the highest defrosting frequency in all defrosting frequency curves corresponding to the difficult frosting interval, namely the defrosting frequency of a compressor in the easy frosting interval is integrally higher than the defrosting frequency in the difficult frosting interval, and the defrosting frequency can be in accordance with the defrosting requirement.
In any of the above technical solutions, preferably, for the determined defrosting frequency curve, any two points a (Ta, Fa) and b (Tb, Fb) are taken, and if Ta > Tb, Fa is less than or equal to Fb.
In the technical scheme, the relationship between the water temperature and the defrosting frequency under the same outdoor environment temperature is specifically defined. When the water temperature is low, the heating efficiency of the system is low, which reflects that the frosting is relatively thick, the defrosting requirement is high, and as mentioned above, the heat absorbed by the indoor evaporation side is less, the heat release capacity of the condensation side is insufficient, and the defrosting capacity is relatively weak; on the contrary, the defrosting requirement is low when the water temperature is high, and the defrosting capability is relatively strong. The defrosting frequency curve is specifically realized, the compressor is controlled to operate according to a certain frequency under the condition that the water temperature is low, so that the stable rising of the water temperature is ensured, the conditions that the defrosting frequency of the compressor is too high and the water temperature rises steeply to influence the stability of the system when the water temperature is too low are avoided, and the control of the compressor for defrosting is facilitated. When the water temperature is in a certain range, the defrosting frequency of the compressor is reduced along with the rise of the water temperature, when the water temperature is low and the frosting is thick, the defrosting frequency is improved, the capacity output during defrosting is increased, the defrosting is completed quickly, accurately and cleanly, the defrosting time is shortened, and the hot water heating time is shortened; when the water temperature is high and the frosting is thin, the defrosting operation frequency is reduced, the capacity output during defrosting is reduced, and on the premise of ensuring that the defrosting is clean, the problems that the outdoor heat exchanger temperature and the system high pressure rise too fast, the sensitivity of a pipeline sensor is not high, the reaction is not timely and the impact on the system is caused due to too-enough defrosting capacity are avoided, so that the reliability is improved. After the water temperature reaches a certain temperature, the defrosting frequency for controlling the compressor to work is kept unchanged and is not reduced continuously, so that the basic defrosting requirement is met, and the defrosting is ensured to be complete. By limiting the property of the defrosting frequency curve, the optimal defrosting frequency is selected according to the comprehensive defrosting condition, and defrosting is performed quickly and accurately, so that the balance of defrosting effect, time and system reliability is realized, and the product quality is improved.
According to a second aspect of the present invention, there is provided a defrosting control system for a heat pump water heater system, wherein the heat pump water heater system comprises: compressor and water tank, the defrosting control system includes: the searching unit is used for responding to the defrosting instruction and searching the defrosting frequency according to the outdoor environment temperature and the water temperature; and the control unit is used for operating the defrosting mode and controlling the compressor to start at the defrosting frequency.
According to the defrosting control system provided by the invention, the searching unit can respond to a defrosting instruction, the defrosting frequency is determined by combining the outdoor environment temperature and the water temperature, and the control unit controls the compression to operate the defrosting mode according to the determined defrosting frequency. Because under different outdoor ambient temperature and different water temperature, the frosting thickness of outdoor heat exchanger is different, that is to say the required heat of dissolving the frost is different, and the system low pressure side can carry out the heat transfer with water tank hot water when changing the frost simultaneously, absorbs the heat evaporation for the heat-releasing capacity of condensation side promotes greatly, and at this change frost in-process, it not only has the relation with compressor operating frequency to change the frost ability, also has the relation with hydrothermal temperature. Therefore, if the compressor can only operate the defrosting mode according to the fixed operation frequency during defrosting, the condition that little frosting is generated in a high water temperature area and a larger defrosting capacity is output is easily generated, energy waste is caused, in addition, because the temperature of the pipe of the heat exchanger in the high water temperature area is increased too fast during defrosting, the temperature change cannot be detected in time by a sensor, the pressure of the heat exchanger is increased rapidly in a certain time period, and the heat pump water heater system is easily unstable, the defrosting frequency of the compressor in the defrosting control system is changed, the problem caused by defrosting by using the fixed frequency is effectively avoided, the frosting condition is judged in advance by combining the outdoor environment temperature and the water temperature, the most suitable defrosting frequency of the compressor is determined by combining the frosting condition, the defrosting effect is ensured, the energy waste is reduced, and the balance of the defrosting effect, the time and the system reliability is ensured, the product quality is improved.
In addition, according to the defrosting control system in the above technical solution provided by the present invention, the following additional technical features may be further provided:
in the above technical solution, preferably, the search unit is specifically configured to: responding to a defrosting instruction, and searching a corresponding temperature interval according to the outdoor environment temperature; acquiring a defrosting frequency curve corresponding to the temperature interval, wherein the abscissa of the defrosting frequency curve corresponds to the water temperature and the ordinate corresponds to the defrosting frequency; and searching the defrosting frequency according to the defrosting frequency curve and the water temperature.
In the technical scheme, the searching unit searches the corresponding temperature interval according to the outdoor environment temperature, and further obtains the corresponding defrosting frequency curve according to different temperature intervals, wherein the defrosting frequency curve is a relation curve taking the water temperature as an abscissa and the defrosting frequency as an ordinate. Because the degree of difficulty of outdoor unit frosting is different under different outdoor environment temperatures, and the frosting thickness under the same outdoor environment temperature changes along with the water temperature, different defrosting frequency curves are set in different temperature intervals, a defrosting frequency curve is determined firstly, then the corresponding defrosting frequency is determined by using the horizontal and vertical coordinates of the selected defrosting frequency curve, and then the compressor is controlled to operate a defrosting mode according to the determined defrosting frequency, so that the searching is convenient.
In any of the above technical solutions, preferably, the number of the temperature intervals is at least two, and all the temperature intervals do not have an intersection; all temperature intervals are divided into an easy-frosting interval and an uneasy-frosting interval, the highest temperature corresponding to the easy-frosting interval is lower than the lowest temperature corresponding to the uneasy-frosting interval, and the lowest frosting frequency in all frosting frequency curves corresponding to the easy-frosting interval is greater than the highest frosting frequency in all frosting frequency curves corresponding to the uneasy-frosting interval.
In the technical scheme, the temperature intervals are established, the frosting difficulty is represented by the temperature intervals, and all the temperature intervals have no intersection, so that the temperature interval to which the detected outdoor environment temperature belongs can be clear, and the control process is reliable. The corresponding frosting area can be directly determined by comparing the outdoor environment temperature, the heat of the water vapor in the air in the low-temperature environment is taken away after the water vapor is contacted with an evaporator in an outdoor unit, phase change is easy to occur, frosting is easy to occur on the surface of the evaporator, the defrosting requirement is correspondingly larger, the temperature interval is divided into an easy frosting interval and a difficult frosting interval, the highest temperature corresponding to the easy frosting interval is lower than the lowest temperature corresponding to the difficult frosting interval, the temperature interval can be reasonably divided, meanwhile, the lowest defrosting frequency in all defrosting frequency curves corresponding to the easy frosting interval is limited to be larger than the highest defrosting frequency in all defrosting frequency curves corresponding to the difficult frosting interval, namely the defrosting frequency of a compressor in the easy frosting interval is integrally higher than the defrosting frequency in the difficult frosting interval, and the defrosting frequency can be in accordance with the defrosting requirement.
In any of the above technical solutions, preferably, for the determined defrosting frequency curve, any two points a (Ta, Fa) and b (Tb, Fb) are taken, and if Ta > Tb, Fa is less than or equal to Fb.
In the technical scheme, the relationship between the water temperature and the defrosting frequency under the same outdoor environment temperature is specifically defined. When the water temperature is low, the heating efficiency of the system is low, which reflects that the frosting is relatively thick, the defrosting requirement is high, and as mentioned above, the heat absorbed by the indoor evaporation side is less, the heat release capacity of the condensation side is insufficient, and the defrosting capacity is relatively weak; on the contrary, the defrosting requirement is low when the water temperature is high, and the defrosting capability is relatively strong. The defrosting frequency curve is specifically realized, the compressor is controlled to operate according to a certain frequency under the condition that the water temperature is low, so that the stable rising of the water temperature is ensured, the conditions that the defrosting frequency of the compressor is too high and the water temperature rises steeply to influence the stability of the system when the water temperature is too low are avoided, and the control of the compressor for defrosting is facilitated. When the water temperature is in a certain range, the defrosting frequency of the compressor is reduced along with the rise of the water temperature, when the water temperature is low and the frosting is thick, the defrosting frequency is improved, the capacity output during defrosting is increased, the defrosting is completed quickly, accurately and cleanly, the defrosting time is shortened, and the hot water heating time is shortened; when the water temperature is high and the frosting is thin, the defrosting operation frequency is reduced, the capacity output during defrosting is reduced, and on the premise of ensuring that the defrosting is clean, the problems that the outdoor heat exchanger temperature and the system high pressure rise too fast, the sensitivity of a pipeline sensor is not high, the reaction is not timely and the impact on the system is caused due to too-enough defrosting capacity are avoided, so that the reliability is improved. After the water temperature reaches a certain temperature, the defrosting frequency for controlling the compressor to work is kept unchanged and is not reduced continuously, so that the basic defrosting requirement is met, and the defrosting is ensured to be complete. By limiting the property of the defrosting frequency curve, the optimal defrosting frequency is selected according to the comprehensive defrosting condition, and defrosting is performed quickly and accurately, so that the balance of defrosting effect, time and system reliability is realized, and the product quality is improved.
According to a third aspect of the present invention, there is provided a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to any of the above-mentioned aspects when executing the computer program.
In the computer device provided by the present invention, when the processor executes the computer program stored in the memory, the steps of the method according to any one of the above technical solutions can be implemented, so that all the beneficial technical effects of the defrosting control method are achieved, and no further description is provided herein.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any one of the preceding claims.
In the computer-readable storage medium provided by the present invention, when being executed by a processor, the computer program stored thereon can implement the steps of the method according to any of the above technical solutions, so that the method has all the beneficial technical effects of the above defrosting control method, and details are not repeated herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a defrost control method according to one embodiment of the present invention;
FIG. 2 shows a schematic flow diagram of a defrost control method according to another embodiment of the invention;
FIG. 3 illustrates a schematic block diagram of a defrosting control system according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of a computer device according to one embodiment of the invention;
FIG. 5 shows a schematic diagram of finding its corresponding temperature interval according to the outdoor ambient temperature;
fig. 6 shows a diagram of the defrosting frequency curve.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The embodiment of the first aspect of the invention provides a defrosting control method for a heat pump water heater system, in particular to a variable-frequency heat pump circulating heating water heater system with a defrosting function, which comprises water path circulating heating, fluorine path circulating heating and secondary circulating heating.
Fig. 1 shows a schematic flow chart of a defrosting control method according to an embodiment of the present invention.
As shown in fig. 1, a defrosting control method according to an embodiment of the present invention includes:
s102, responding to a defrosting instruction, and searching a defrosting frequency according to the outdoor environment temperature and the water temperature;
and S104, operating a defrosting mode, and controlling the compressor to start at a defrosting frequency.
The defrosting control method provided by the embodiment of the invention can respond to a defrosting instruction, determine the defrosting frequency by combining the outdoor environment temperature and the water temperature, and control the compression to operate the defrosting mode according to the determined defrosting frequency. Because under different outdoor ambient temperature and different water temperature, the frosting thickness of outdoor heat exchanger is different, that is to say the required heat of dissolving the frost is different, and the system low pressure side can carry out the heat transfer with water tank hot water when changing the frost simultaneously, absorbs the heat evaporation for the heat-releasing capacity of condensation side promotes greatly, and at this change frost in-process, it not only has the relation with compressor operating frequency to change the frost ability, also has the relation with hydrothermal temperature. Therefore, if the compressor can only operate the defrosting mode according to the fixed operation frequency during defrosting, the condition that little frosting is generated in a high water temperature area and a larger defrosting capacity is output is easily generated, energy waste is caused, in addition, because the temperature of the pipe of the heat exchanger in the high water temperature area is increased too fast during defrosting, the temperature change cannot be detected in time by a sensor, the pressure of the heat exchanger is increased rapidly in a certain time period, and the heat pump water heater system is easily unstable, the defrosting frequency of the compressor is changed in the defrosting control method of the invention, the problem caused by defrosting by using the fixed frequency is effectively avoided, the frosting condition is pre-judged according to the outdoor environment temperature and the water temperature, the most suitable defrosting frequency of the compressor is determined according to the frosting condition, the defrosting effect is ensured, the energy waste is reduced, and the balance of the defrosting effect, the time and the system reliability is ensured, the product quality is improved. Alternatively, the water temperature may be the water temperature of the water tank, or the water temperature in the water circuit.
In one embodiment of the invention, the heat pump water heater system can directly acquire the outdoor environment temperature and the water temperature of the water tank in real time through the sensor so as to judge whether the defrosting condition is met, and when the defrosting condition is met, a defrosting instruction is generated so as to respond to the defrosting instruction and search the defrosting frequency according to the outdoor environment temperature and the water temperature; and operating a defrosting mode, and controlling the compressor to start at a defrosting frequency.
In this embodiment, the heat pump water heater system automatically determines whether a defrosting operation is required, and defrosting is performed on time.
In an embodiment of the present invention, the heat pump water heater system may receive a defrosting command input by a user via an operation panel, a remote controller, or an application program, and respond to the defrosting command after receiving the defrosting command to detect an outdoor ambient temperature and a water temperature of the water tank, so as to control the compressor to operate a defrosting mode according to a defrosting frequency to defrost.
Fig. 2 shows a schematic flowchart of a defrosting control method according to another embodiment of the present invention.
As shown in fig. 2, a defrosting control method according to another embodiment of the present invention includes:
s202, responding to a defrosting instruction, and searching a corresponding temperature interval according to the outdoor environment temperature;
s204, acquiring a defrosting frequency curve corresponding to the temperature interval;
s206, searching for defrosting frequency according to the defrosting frequency curve and the water temperature;
and S208, operating a defrosting mode, and controlling the compressor to start at a defrosting frequency.
Wherein, the abscissa of the defrosting frequency curve corresponds to the water temperature, and the ordinate corresponds to the defrosting frequency.
In the embodiment, the corresponding temperature interval is searched according to the outdoor environment temperature, and then the corresponding defrosting frequency curve is obtained according to different temperature intervals, wherein the defrosting frequency curve is a relation curve taking the water temperature as an abscissa and the defrosting frequency as an ordinate. Because the degree of difficulty of outdoor unit frosting is different under different outdoor environment temperatures, and the frosting thickness under the same outdoor environment temperature changes along with the water temperature, different defrosting frequency curves are set in different temperature intervals, a defrosting frequency curve is determined firstly, then the corresponding defrosting frequency is determined by using the horizontal and vertical coordinates of the selected defrosting frequency curve, and then the compressor is controlled to operate a defrosting mode according to the determined defrosting frequency, so that the searching is convenient.
In one embodiment of the present invention, preferably, the number of the temperature intervals is at least two, and all the temperature intervals have no intersection; all temperature intervals are divided into an easy-frosting interval and an uneasy-frosting interval, the highest temperature corresponding to the easy-frosting interval is lower than the lowest temperature corresponding to the uneasy-frosting interval, and the lowest frosting frequency in all frosting frequency curves corresponding to the easy-frosting interval is greater than the highest frosting frequency in all frosting frequency curves corresponding to the uneasy-frosting interval.
In the embodiment, the temperature intervals are established, the frosting difficulty degree is represented by the temperature intervals, and all the temperature intervals have no intersection, so that the temperature interval to which the detected outdoor environment temperature belongs can be clear, and the control process is reliable. The corresponding frosting area can be directly determined by comparing the outdoor environment temperature, the heat of the water vapor in the air in the low-temperature environment is taken away after the water vapor is contacted with an evaporator in an outdoor unit, phase change is easy to occur, frosting is easy to occur on the surface of the evaporator, the defrosting requirement is correspondingly larger, the temperature interval is divided into an easy frosting interval and an difficult frosting interval, the highest temperature corresponding to the easy frosting interval is lower than the lowest temperature corresponding to the difficult frosting interval, the temperature interval can be divided reasonably, meanwhile, the lowest defrosting frequency in all defrosting frequency curves corresponding to the easy frosting interval is limited to be larger than the highest defrosting frequency in all defrosting frequency curves corresponding to the difficult frosting interval, namely the defrosting frequency of a compressor in the easy frosting interval is integrally higher than the defrosting frequency in the difficult frosting interval, and the defrosting frequency can be in accordance with the defrosting requirement.
In one embodiment of the invention, preferably, for the determined defrosting frequency curve, any two points a (Ta, Fa) and b (Tb, Fb) are taken, and if Ta > Tb, Fa ≦ Fb.
In this embodiment, the relationship between the water temperature and the defrosting frequency at the same outdoor ambient temperature is specifically defined. When the water temperature is low, the heating efficiency of the system is low, which reflects that the frosting is relatively thick, the defrosting requirement is high, and as mentioned above, the heat absorbed by the indoor evaporation side is less, the heat release capacity of the condensation side is insufficient, and the defrosting capacity is relatively weak; on the contrary, the defrosting requirement is low when the water temperature is high, and the defrosting capability is relatively strong. The defrosting frequency curve is specifically realized, the compressor is controlled to operate according to a certain frequency under the condition that the water temperature is low, so that the stable rising of the water temperature is ensured, the conditions that the defrosting frequency of the compressor is too high and the water temperature rises steeply to influence the stability of the system when the water temperature is too low are avoided, and the control of the compressor for defrosting is facilitated. When the water temperature is in a certain range, the defrosting frequency of the compressor is reduced along with the rise of the water temperature, when the water temperature is low and the frosting is thick, the defrosting frequency is improved, the capacity output during defrosting is increased, the defrosting is completed quickly, accurately and cleanly, the defrosting time is shortened, and the hot water heating time is shortened; when the water temperature is high and the frosting is thin, the defrosting operation frequency is reduced, the capacity output during defrosting is reduced, and on the premise of ensuring that the defrosting is clean, the problems that the outdoor heat exchanger temperature and the system high pressure rise too fast, the sensitivity of a pipeline sensor is not high, the reaction is not timely and the impact on the system is caused due to too-enough defrosting capacity are avoided, so that the reliability is improved. After the water temperature reaches a certain temperature, the defrosting frequency for controlling the compressor to work is kept unchanged and is not reduced continuously, so that the basic defrosting requirement is met, and the defrosting is ensured to be complete. By limiting the property of the defrosting frequency curve, the optimal defrosting frequency is selected according to the comprehensive defrosting condition, defrosting is rapidly and accurately performed, the defrosting effect, time and system reliability are balanced, and the product quality is improved.
The embodiment of the second aspect of the invention provides a defrosting control system for a heat pump water heater system, in particular to a variable-frequency heat pump circulating heating water heater system with a defrosting function, which comprises water path circulating heating, fluorine path circulating heating and secondary circulating heating.
FIG. 3 illustrates a schematic block diagram of a defrosting control system 300 according to one embodiment of the present invention.
As shown in fig. 3, a defrosting control system 300 according to an embodiment of the present invention includes:
the searching unit 302 is used for responding to a defrosting instruction and searching a defrosting frequency according to the outdoor environment temperature and the water temperature;
and the control unit 304 is used for operating the defrosting mode and controlling the compressor to start at the defrosting frequency.
In the defrosting control system provided in the embodiment of the present invention, the searching unit 302 may determine a defrosting frequency by combining the outdoor ambient temperature and the water temperature in response to the defrosting command, and the control unit 304 controls the compression to operate the defrosting mode according to the determined defrosting frequency. Because under different outdoor ambient temperature and different water temperature, the frosting thickness of outdoor heat exchanger is different, that is to say the required heat of dissolving the frost is different, and the system low pressure side can carry out the heat transfer with water tank hot water when changing the frost simultaneously, absorbs the heat evaporation for the heat-releasing capacity of condensation side promotes greatly, and at this change frost in-process, it not only has the relation with compressor operating frequency to change the frost ability, also has the relation with hydrothermal temperature. Therefore, if the compressor can only operate the defrosting mode according to the fixed operation frequency during defrosting, the condition that little frosting is generated in a high water temperature area and a larger defrosting capacity is output is easily generated, energy waste is caused, in addition, because the temperature of the pipe of the heat exchanger in the high water temperature area is increased too fast during defrosting, the temperature change cannot be detected in time by a sensor, the pressure of the heat exchanger is increased rapidly in a certain time period, and the heat pump water heater system is easily unstable, the defrosting frequency of the compressor in the defrosting control system is changed, the problem caused by defrosting by using the fixed frequency is effectively avoided, the frosting condition is judged in advance by combining the outdoor environment temperature and the water temperature, the most suitable defrosting frequency of the compressor is determined by combining the frosting condition, the defrosting effect is ensured, the energy waste is reduced, and the balance of the defrosting effect, the time and the system reliability is ensured, the product quality is improved. Alternatively, the water temperature may be the water temperature of the water tank, or the water temperature in the water circuit.
In one embodiment of the invention, the heat pump water heater system can directly acquire the outdoor environment temperature and the water temperature of the water tank in real time through the sensor so as to judge whether the defrosting condition is met, and when the defrosting condition is met, a defrosting instruction is generated so as to respond to the defrosting instruction and search the defrosting frequency according to the outdoor environment temperature and the water temperature; and operating a defrosting mode, and controlling the compressor to start at a defrosting frequency.
In this embodiment, the heat pump water heater system automatically determines whether a defrosting operation is required, and defrosting is performed on time.
In an embodiment of the present invention, the heat pump water heater system may receive a defrosting command input by a user via an operation panel, a remote controller, or an application program, and respond to the defrosting command after receiving the defrosting command to detect an outdoor ambient temperature and a water temperature of the water tank, so as to control the compressor to operate a defrosting mode according to a defrosting frequency to defrost.
In an embodiment of the present invention, preferably, the search unit is specifically configured to: responding to a defrosting instruction, and searching a corresponding temperature interval according to the outdoor environment temperature; acquiring a defrosting frequency curve corresponding to the temperature interval, wherein the abscissa of the defrosting frequency curve corresponds to the water temperature and the ordinate corresponds to the defrosting frequency; and searching the defrosting frequency according to the defrosting frequency curve and the water temperature.
In this embodiment, the searching unit searches the corresponding temperature interval according to the outdoor environment temperature, and further obtains the corresponding defrosting frequency curve according to different temperature intervals, wherein the defrosting frequency curve is a relation curve taking the water temperature as an abscissa and the defrosting frequency as an ordinate. Because the degree of difficulty of outdoor unit frosting is different under different outdoor environment temperatures, and the frosting thickness under the same outdoor environment temperature changes along with the water temperature, different defrosting frequency curves are set in different temperature intervals, a defrosting frequency curve is determined firstly, the corresponding defrosting frequency is determined by using the horizontal and vertical coordinates of the defrosting frequency curve, and then the compressor is controlled to operate a defrosting mode according to the determined defrosting frequency, so that the searching is convenient.
In one embodiment of the present invention, preferably, the number of the temperature intervals is at least two, and all the temperature intervals have no intersection; all temperature intervals are divided into an easy-frosting interval and an uneasy-frosting interval, the highest temperature corresponding to the easy-frosting interval is lower than the lowest temperature corresponding to the uneasy-frosting interval, and the lowest frosting frequency in all frosting frequency curves corresponding to the easy-frosting interval is greater than the highest frosting frequency in all frosting frequency curves corresponding to the uneasy-frosting interval.
In the embodiment, the temperature intervals are established, the frosting difficulty degree is represented by the temperature intervals, and all the temperature intervals have no intersection, so that the temperature interval to which the detected outdoor environment temperature belongs can be clear, and the control process is reliable. The corresponding frosting area can be directly determined by comparing the outdoor environment temperature, the heat of the water vapor in the air in the low-temperature environment is taken away after the water vapor is contacted with an evaporator in an outdoor unit, phase change is easy to occur, frosting is easy to occur on the surface of the evaporator, the defrosting requirement is correspondingly larger, the temperature interval is divided into an easy frosting interval and a difficult frosting interval, the highest temperature corresponding to the easy frosting interval is lower than the lowest temperature corresponding to the difficult frosting interval, the temperature interval can be reasonably divided, meanwhile, the lowest defrosting frequency in all defrosting frequency curves corresponding to the easy frosting interval is limited to be larger than the highest defrosting frequency in all defrosting frequency curves corresponding to the difficult frosting interval, namely the defrosting frequency of a compressor in the easy frosting interval is integrally higher than the defrosting frequency in the difficult frosting interval, and the defrosting frequency can be in accordance with the defrosting requirement.
In one embodiment of the invention, preferably, for the determined defrosting frequency curve, any two points a (Ta, Fa) and b (Tb, Fb) are taken, and if Ta > Tb, Fa ≦ Fb.
In this embodiment, the relationship between the water temperature and the defrosting frequency at the same outdoor ambient temperature is specifically defined. When the water temperature is low, the heating efficiency of the system is low, which reflects that the frosting is relatively thick, the defrosting requirement is high, and as mentioned above, the heat absorbed by the indoor evaporation side is less, the heat release capacity of the condensation side is insufficient, and the defrosting capacity is relatively weak; on the contrary, the defrosting requirement is low when the water temperature is high, and the defrosting capability is relatively strong. The defrosting frequency curve is specifically realized, the compressor is controlled to operate according to a certain frequency under the condition that the water temperature is low, so that the stable rising of the water temperature is ensured, the conditions that the defrosting frequency of the compressor is too high and the water temperature rises steeply to influence the stability of the system when the water temperature is too low are avoided, and the control of the compressor for defrosting is facilitated. When the water temperature is in a certain range, the defrosting frequency of the compressor is reduced along with the rise of the water temperature, when the water temperature is low and the frosting is thick, the defrosting frequency is improved, the capacity output during defrosting is increased, the defrosting is completed quickly, accurately and cleanly, the defrosting time is shortened, and the hot water heating time is shortened; when the water temperature is high and the frosting is thin, the defrosting operation frequency is reduced, the capacity output during defrosting is reduced, and on the premise of ensuring that the defrosting is clean, the problems that the outdoor heat exchanger temperature and the system high pressure rise too fast, the sensitivity of a pipeline sensor is not high, the reaction is not timely and the impact on the system is caused due to too-enough defrosting capacity are avoided, so that the reliability is improved. After the water temperature reaches a certain temperature, the defrosting frequency for controlling the compressor to work is kept unchanged and is not reduced continuously, so that the basic defrosting requirement is met, and the defrosting is ensured to be complete. By limiting the property of the defrosting frequency curve, the optimal defrosting frequency is selected according to the comprehensive defrosting condition, and defrosting is performed quickly and accurately, so that the balance of defrosting effect, time and system reliability is realized, and the product quality is improved.
Embodiments of the third aspect of the present invention provide a computer device, as shown in fig. 4, the computer device 400 includes a memory 402, a processor 404 and a computer program stored on the memory 402 and executable on the processor 404, and the processor 404 implements the steps of the method according to any of the above embodiments when executing the computer program.
In the computer device 400 provided by the present invention, when the processor 404 executes the computer program stored in the memory 402, the steps of the method according to any of the above embodiments can be implemented, so that all the beneficial technical effects of the defrosting control method described above are achieved, and are not described herein again.
An embodiment of a fourth aspect of the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any one of the embodiments described above.
In the computer-readable storage medium provided by the present invention, when being executed by a processor, the computer program stored thereon can implement the steps of the method according to any of the above embodiments, so that the method has all the beneficial technical effects of the above defrosting control method, and further description is omitted here.
The technical scheme of the invention is described in detail by combining the attached drawings, the defrosting method responds to a defrosting instruction, searches a corresponding temperature interval according to the outdoor environment temperature, acquires a defrosting frequency curve corresponding to the temperature interval, searches a defrosting frequency according to the defrosting frequency curve and the water temperature, operates a defrosting mode, and controls the compressor to start at the defrosting frequency, so that the problem of defrosting by using fixed frequency is effectively avoided, the defrosting frequency is determined by combining the outdoor environment temperature and the water temperature, the most suitable defrosting frequency of the compressor can be determined, the defrosting effect is ensured, the energy waste is reduced, and the reliability of the system is improved.
Specifically, for the frost-prone interval, the temperature is usually about 0 ℃ or even below 0 ℃, and studies show that-3 ℃ to 3 ℃ is the most frost-prone temperature interval, so that the defrosting frequency is the highest in the temperature interval, and when the temperature is further reduced, the frosting difficulty is reduced due to the reduction of the air humidity, and the defrosting frequency is correspondingly reduced; in the region where frost is not easy to form, the temperature is usually above 3 ℃, and the defrosting frequency is the lowest. For example, as shown in fig. 5, the outdoor ambient temperature is divided into three sections, wherein the first temperature section corresponds to a temperature at T1The temperature corresponding to the second temperature interval is T0To T1The third temperature interval corresponds to the temperature T0Temperature interval of wherein T0At a temperature of-3 ℃ T1The temperature is 3 ℃, the first temperature interval is a non-frosting interval, and the second and third temperature intervals are frosting-prone temperature intervals. FIG. 6 shows a defrosting frequency curve with the abscissa of the defrosting frequency curve corresponding to the water temperature T according to an embodiment of the present inventionWater (W)The ordinate corresponds to the defrosting frequency F. Wherein, F1>F4>F2>F5>F3>F6，F1And F4The connecting lines between the two lines form a second curve; f2And F5The connecting lines between the two lines form a third curve; f3And F6The first curve, the second curve and the third curve are respectively connected with the first temperature interval, the second temperature interval and the third temperature areaCorrespond to each other. It should be noted that the number of the temperature intervals is not limited to the three, and the temperature intervals can be divided according to the actual situation of the system; meanwhile, the water temperature and the defrosting frequency in the defrosting frequency curve are determined after experimental detection is carried out on different systems, the defrosting frequency curve can be obtained by firstly determining the water temperature and the defrosting frequency corresponding to straight sections at two ends as shown in fig. 6, then connecting the middle parts into a straight line, and also can be obtained by firstly determining a plurality of optimal defrosting frequency points corresponding to the water temperature and then fitting to form the defrosting frequency curve.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A defrosting control method for a heat pump water heater system, wherein the heat pump water heater system comprises a compressor and a water tank, and the defrosting control method comprises the following steps:
responding to a defrosting instruction, and searching a defrosting frequency according to the outdoor environment temperature and the water temperature;
operating a defrosting mode, and controlling the compressor to start at the defrosting frequency;
the operation of searching the defrosting frequency according to the outdoor environment temperature and the water temperature comprises the following steps:
searching a corresponding temperature interval according to the outdoor environment temperature;
acquiring a defrosting frequency curve corresponding to the temperature interval, wherein the abscissa of the defrosting frequency curve corresponds to the water temperature, and the ordinate corresponds to the defrosting frequency;
searching the defrosting frequency according to the defrosting frequency curve and the water temperature;
and taking any two points a (Ta, Fa) and b (Tb, Fb) on the determined defrosting frequency curve, wherein if Ta is greater than Tb, Fa is less than or equal to Fb.
2. The defrosting control method according to claim 1,
the number of the temperature intervals is at least two, and all the temperature intervals have no intersection;
all the temperature intervals are divided into an interval which is easy to frost and an interval which is not easy to frost, the highest temperature corresponding to the interval which is easy to frost is lower than the lowest temperature corresponding to the interval which is not easy to frost, and the lowest defrosting frequency in all the defrosting frequency curves corresponding to the interval which is easy to frost is greater than the highest defrosting frequency in all the defrosting frequency curves corresponding to the interval which is not easy to frost.
3. A defrosting control system for a heat pump water heater system, the heat pump water heater system including a compressor and a water tank, the defrosting control system comprising:
the searching unit is used for responding to the defrosting instruction and searching the defrosting frequency according to the outdoor environment temperature and the water temperature;
the control unit is used for operating a defrosting mode and controlling the compressor to start at the defrosting frequency;
the search unit is specifically configured to:
responding to a defrosting instruction, and searching a corresponding temperature interval according to the outdoor environment temperature;
acquiring a defrosting frequency curve corresponding to the temperature interval, wherein the abscissa of the defrosting frequency curve corresponds to the water temperature, and the ordinate corresponds to the defrosting frequency;
searching the defrosting frequency according to the defrosting frequency curve and the water temperature;
and taking any two points a (Ta, Fa) and b (Tb, Fb) on the determined defrosting frequency curve, wherein if Ta is greater than Tb, Fa is less than or equal to Fb.
4. The defrosting control system of claim 3,
the number of the temperature intervals is at least two, and all the temperature intervals have no intersection;
all the temperature intervals are divided into an interval which is easy to frost and an interval which is not easy to frost, the highest temperature corresponding to the interval which is easy to frost is lower than the lowest temperature corresponding to the interval which is not easy to frost, and the lowest defrosting frequency in all the defrosting frequency curves corresponding to the interval which is easy to frost is greater than the highest defrosting frequency in all the defrosting frequency curves corresponding to the interval which is not easy to frost.
5. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to claim 1 or 2 are implemented when the processor executes the computer program.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as claimed in claim 1 or 2.
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| CN201810416633.9A CN108826772B (en) | 2018-05-03 | 2018-05-03 | Defrosting control method and system |
| PCT/CN2019/084277 WO2019210802A1 (en) | 2018-05-03 | 2019-04-25 | Defrosting control method and system |
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| CN201810416633.9A CN108826772B (en) | 2018-05-03 | 2018-05-03 | Defrosting control method and system |
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| CN108826772B (en) * | 2018-05-03 | 2020-11-17 | 广东美的暖通设备有限公司 | Defrosting control method and system |
| CN110332716B (en) * | 2019-07-16 | 2021-01-15 | 珠海格力电器股份有限公司 | Defrosting control method and device for heat pump water heater and heat pump water heater |
| JP7445287B2 (en) * | 2019-12-26 | 2024-03-07 | アクア株式会社 | refrigerator |
| CN114811957B (en) * | 2021-01-29 | 2024-02-09 | 青岛海尔新能源电器有限公司 | Control method and control device of water heater |
| CN113237257B (en) * | 2021-04-11 | 2022-07-19 | 浙江中广电器集团股份有限公司 | Defrosting frequency control method, processor and variable frequency water machine |
| CN114963291B (en) * | 2021-06-29 | 2023-11-17 | 青岛海尔新能源电器有限公司 | Heating machine control method, device, equipment and storage medium |
| CN114413454B (en) * | 2021-12-09 | 2023-04-14 | 珠海格力电器股份有限公司 | Fuzzy algorithm-based air conditioner heating and frost suppression control method and system and air conditioner |
| CN114383266B (en) * | 2021-12-17 | 2023-06-16 | 珠海格力电器股份有限公司 | Defrosting frequency control method and air conditioning system |
| CN116336711A (en) * | 2023-03-15 | 2023-06-27 | 珠海格力电器股份有限公司 | Defrosting control method and device for air source heat pump and air source heat pump |
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| CN108826772A (en) | 2018-11-16 |
| WO2019210802A1 (en) | 2019-11-07 |
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