CN111649484A - Frequency conversion control method for heat pump water heater or heat pump water cooling and heating machine - Google Patents
Frequency conversion control method for heat pump water heater or heat pump water cooling and heating machine Download PDFInfo
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- CN111649484A CN111649484A CN202010449005.8A CN202010449005A CN111649484A CN 111649484 A CN111649484 A CN 111649484A CN 202010449005 A CN202010449005 A CN 202010449005A CN 111649484 A CN111649484 A CN 111649484A
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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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- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a frequency conversion control method for a heat pump water heater or a heat pump water cooling and heating machine, which comprises the following steps: during heating: if the difference between the set temperature and the current water temperature is larger than the set frequency-raising temperature difference, raising the frequency; if the difference between the current water temperature and the set temperature is larger than the set frequency reduction temperature difference, frequency reduction is carried out; if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to a set operation period, the current frequency is increased to the heating shutdown temperature to shut down; during refrigeration: if the difference between the current water temperature and the set temperature is larger than the set frequency-increasing temperature difference, increasing the frequency; if the difference between the set temperature and the current water temperature is larger than the set frequency reduction temperature difference, reducing the frequency; and if the current water temperature is the same as the set temperature, keeping the current frequency to operate, and increasing the frequency to the refrigeration shutdown temperature to shutdown after keeping the current frequency to operate to the set operation period. The method adjusts the temperature by controlling the frequency reduction amplitude and the detection period, and has reasonable control logic, small temperature fluctuation and energy saving.
Description
Technical Field
The invention relates to a variable-frequency heat pump water cooling and heating machine and a variable-frequency control method of the variable-frequency heat pump water heating machine.
Background
An air source heat pump is an energy-saving device which utilizes high-level energy to enable heat to flow from low-level heat source air to a high-level heat source. It is a form of heat pump. As the name implies, a heat pump, like a pump, can convert low-level heat energy (such as heat contained in air, soil and water) which cannot be directly utilized into high-level heat energy which can be utilized, thereby achieving the purpose of saving part of high-level energy (such as coal, gas, oil, electric energy and the like).
The conventional compressor adopts a variable frequency compressor, and the variable frequency compressor has a good energy-saving effect. Although the existing heat pump water heater or heat pump water cooling and heating machine also adopts a frequency converter for control, the control logic is unreasonable, the current water temperature is increased to the highest frequency for operation when being lower than the set temperature, the power of the highest frequency operation is maximum, energy is not saved, and overhigh temperature is easily caused, so that the temperature fluctuation is large; if the current temperature is higher than the set temperature, the frequency is directly reduced to the minimum frequency or the machine is shut down, so that the temperature fluctuation is large. This is also the case for the cooling mode.
Disclosure of Invention
In order to solve the problems, the invention provides a heat pump cold and hot water machine with energy saving, small temperature fluctuation and reasonable control logic and a frequency conversion control method of the hot water machine, and the specific technical scheme is as follows:
the frequency conversion control method of the heat pump water heater or the heat pump water cooling and heating machine comprises the following steps: detecting the current water temperature and the current frequency of the variable frequency compressor; during heating: if the difference between the set temperature and the current water temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set heating shutdown temperature; if the difference between the current water temperature and the set temperature is larger than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the heating shutdown temperature; if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to a set operation period, the current frequency is increased to the heating shutdown temperature to shut down; during refrigeration: if the difference between the current water temperature and the set temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set refrigeration shutdown temperature; if the difference between the set temperature and the current water temperature is greater than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the refrigeration shutdown temperature; if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to a set operation period, the current frequency is increased to the refrigeration shutdown temperature to shutdown; the set temperature is the temperature of a set target, and the current water temperature is the water tank temperature or the return water temperature of the air conditioner.
Further, the frequency-increasing temperature difference is 1-4; the temperature difference of the frequency reduction is 1-4.
Furthermore, the frequency is increased according to a set frequency increasing amplitude during frequency increasing, the current water temperature is detected according to a set frequency increasing detection period, if the water temperature detected in the frequency increasing detection period can be increased or decreased, the current frequency operation is kept, if the water temperature detected in the frequency increasing detection period is not changed, the frequency is continuously increased according to the set frequency increasing amplitude, if the frequency is increased to the maximum operation frequency, the maximum operation frequency operation is kept, if the water temperature detected in the frequency increasing detection period is the same as the set temperature, the current frequency operation is kept, and if the water temperature detected in the frequency increasing detection period reaches the heating shutdown temperature or the cooling shutdown temperature, the machine is shut down; the method comprises the steps of reducing the frequency according to a set frequency reduction amplitude during frequency reduction, detecting the current water temperature according to a set frequency reduction detection period, keeping the current frequency running if the water temperature detected in the frequency reduction detection period can rise or fall, continuing to reduce the frequency according to the set frequency reduction amplitude if the water temperature detected in the frequency reduction detection period does not change, keeping the minimum running frequency running if the frequency is reduced to the minimum running frequency, keeping the current frequency running if the water temperature detected in the frequency reduction detection period is the same as the set temperature, and stopping the machine if the water temperature detected in the frequency reduction detection period reaches a heating shutdown temperature or a refrigerating shutdown temperature.
Furthermore, at least two frequency boosting intervals are set during the frequency boosting, the frequency boosting amplitude of the adjacent frequency boosting intervals is different, and the frequency boosting detection period is different or remains unchanged; at least two frequency reduction intervals are set during frequency reduction, the frequency reduction amplitude of adjacent frequency reduction intervals is different, and the frequency reduction detection period is different or remains unchanged.
Furthermore, three frequency increasing intervals are arranged according to the temperature difference between the current water temperature and the set temperature, wherein the three frequency increasing intervals are respectively greater than the frequency increasing temperature difference and less than or equal to 5, greater than 5 and less than or equal to 10 and greater than 10; when the frequency raising interval is greater than the frequency raising temperature difference and less than or equal to 5, the frequency raising amplitude is 1-3Hz, and the frequency raising detection period is 1-5 minutes; when the frequency boosting interval is more than 5 and less than or equal to 10, the frequency boosting amplitude is 4-8Hz, and the frequency boosting detection period is 1-5 minutes; when the frequency raising interval is more than 10, the frequency raising amplitude is 9-15Hz, and the frequency raising detection period is 1-5 minutes.
Furthermore, the frequency reduction intervals are three according to the operating frequency of the variable frequency compressor, and are respectively more than or equal to 60Hz, less than 60Hz and more than or equal to 45Hz, and more than the minimum operating frequency and less than 45 Hz; when the frequency reduction interval is greater than or equal to 60Hz, the frequency reduction amplitude is 9-15Hz, and the frequency reduction detection period is 1-60 seconds; when the frequency reduction interval is less than 60Hz and more than or equal to 45Hz, the frequency reduction amplitude is 4-8Hz, and the frequency reduction detection period is 1-60 seconds; when the frequency reduction interval is greater than the minimum operating frequency and less than 45Hz, the frequency reduction amplitude is 1-3Hz, and the frequency reduction detection period is 1-60 seconds.
Further, the minimum operating frequency is 30 Hz.
Further, the refrigeration shutdown temperature is 1 ℃ lower than the set temperature, and the heating shutdown temperature is 2 ℃ higher than the set temperature.
Further, the operation period is 5-30 minutes.
Further, when the variable frequency compressor is started, the variable frequency compressor is operated to 40Hz and is operated for 1-5 minutes, and then the temperature is detected to adjust the frequency.
Compared with the prior art, the invention has the following beneficial effects:
the frequency conversion control method of the heat pump water heater or the heat pump water heater and cooler provided by the invention adjusts the temperature by controlling the frequency reduction amplitude and the detection period, and has the advantages of reasonable control logic, small temperature fluctuation and energy conservation.
Detailed Description
The present invention will now be further described.
The frequency conversion control method of the heat pump water heater or the heat pump water cooling and heating machine comprises the following steps: detecting the current water temperature and the current frequency of the variable frequency compressor; during heating: if the difference between the set temperature and the current water temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set heating shutdown temperature; if the difference between the current water temperature and the set temperature is larger than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the heating shutdown temperature; if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to the set operation period, the current frequency is increased to the heating shutdown temperature to shut down; during refrigeration: if the difference between the current water temperature and the set temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set refrigeration shutdown temperature; if the difference between the set temperature and the current water temperature is larger than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the refrigeration shutdown temperature; if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to the set operation period, the current frequency is increased to the refrigeration shutdown temperature to shut down; the set temperature is the temperature set by the air conditioner, and the current water temperature is the water tank temperature or the return water temperature of the air conditioner.
The frequency-raising temperature difference is 1-4; the temperature difference of the frequency reduction is 1-4.
During frequency rising, according to the set frequency rising amplitude, detecting the current water temperature according to the set frequency rising detection period, if the detected water temperature in the frequency rising detection period can rise or fall, keeping the current frequency running, if the detected water temperature in the frequency rising detection period does not change, continuing to raise the frequency according to the set frequency rising amplitude, if the frequency rises to the maximum running frequency, keeping the maximum running frequency running, if the detected water temperature in the frequency rising detection period is the same as the set temperature, keeping the current frequency running, and if the detected water temperature in the frequency rising detection period reaches the heating shutdown temperature or the refrigerating shutdown temperature, stopping the machine; the method comprises the steps of reducing the frequency according to a set frequency reduction amplitude during frequency reduction, detecting the current water temperature according to a set frequency reduction detection period, keeping the current frequency running if the water temperature detected in the frequency reduction detection period can rise or fall, continuing to reduce the frequency according to the set frequency reduction amplitude if the water temperature detected in the frequency reduction detection period does not change, keeping the minimum running frequency running if the frequency is reduced to the minimum running frequency, keeping the current frequency running if the water temperature detected in the frequency reduction detection period is the same as the set temperature, and stopping the machine if the water temperature detected in the frequency reduction detection period reaches a heating shutdown temperature or a cooling shutdown temperature.
At least two frequency boosting intervals are set during frequency boosting, the frequency boosting amplitude of adjacent frequency boosting intervals is different, and the frequency boosting detection period is different or remains unchanged; at least two frequency reduction intervals are set during frequency reduction, the frequency reduction amplitude of adjacent frequency reduction intervals is different, and the frequency reduction detection period is different or remains unchanged.
Three frequency increasing intervals are set according to the temperature difference between the current water temperature and the set temperature, wherein the three frequency increasing intervals are respectively greater than the frequency increasing temperature difference and less than or equal to 5, greater than 5 and less than or equal to 10 and greater than 10; when the frequency raising interval is greater than the frequency raising temperature difference and less than or equal to 5, the frequency raising amplitude is 1-3Hz, and the frequency raising detection period is 1-5 minutes; when the frequency boosting interval is more than 5 and less than or equal to 10, the frequency boosting amplitude is 4-8Hz, and the frequency boosting detection period is 1-5 minutes; when the frequency raising interval is more than 10, the frequency raising amplitude is 9-15Hz, and the frequency raising detection period is 1-5 minutes.
The frequency reduction intervals are three according to the operating frequency of the variable frequency compressor, and are respectively more than or equal to 60Hz, less than 60Hz and more than or equal to 45Hz, and more than the minimum operating frequency and less than 45 Hz; when the frequency reduction interval is more than or equal to 60Hz, the frequency reduction amplitude is 9-15Hz, and the frequency reduction detection period is 1-60 seconds; when the frequency reduction interval is less than 60Hz and more than or equal to 45Hz, the frequency reduction amplitude is 4-8Hz, and the frequency reduction detection period is 1-60 seconds; when the frequency reduction interval is larger than the minimum operating frequency and smaller than 45Hz, the frequency reduction amplitude is 1-3Hz, and the frequency reduction detection period is 1-60 seconds.
The minimum operating frequency is 30 Hz. The refrigeration shutdown temperature is 1 ℃ lower than the set temperature, and the heating shutdown temperature is 2 ℃ higher than the set temperature. The running period is 5-30 minutes. When the frequency conversion compressor is started, the frequency conversion compressor is firstly operated to 40Hz and is operated for 1-5 minutes, and then the temperature is detected to carry out frequency adjustment.
The specific process is as follows:
during heating: setting the current water temperature as H1, setting the temperature as H0, setting the minimum operation frequency as 30Hz, the maximum operation frequency as 80Hz, setting the current frequency as P, setting the operation period as 20 minutes, the frequency-increasing detection period as 3 minutes, setting the frequency-reducing detection period as 30 seconds, setting the heating shutdown temperature as H0+2 ℃, setting the frequency-increasing temperature difference as 3 and setting the frequency-reducing temperature difference as 2.
Starting a variable frequency compressor, running the variable frequency compressor to 40Hz for 3 minutes, and then detecting the current water temperature H1 and the current running frequency;
if H0-H1 > 3, the frequency is increased, if H1-H0 > 2, and if H0 is H1, the current frequency is kept running;
when the frequency is increased:
if H0-H1 is more than 10, the frequency rising amplitude is 10Hz, the frequency rising detection period is 3 minutes, detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely, the current frequency is kept unchanged at 50Hz (the current frequency is 40+10 to 50Hz), and meanwhile, the water temperature is detected according to the frequency rising detection period; if the detected water temperature does not change, continuously increasing 10Hz, wherein the operation frequency is 60Hz (50+10 is 60Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 60Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the heating stop temperature (H0+2 ℃);
if H0-H1 is more than 5 and less than or equal to 10, the frequency rising amplitude is 5Hz, the frequency rising detection period is 3 minutes, detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely 45Hz is kept unchanged (the current frequency is 40+5 to 45Hz), and meanwhile, the water temperature is detected according to the frequency rising detection period; if the detected water temperature does not change, continuously increasing 5Hz, wherein the operation frequency is 50Hz (45+5 is 50Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 50Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the heating stop temperature (H0+2 ℃);
if the frequency is more than 3 and less than or equal to H0-H1 and less than or equal to 5, the frequency-rising amplitude is 3Hz, the frequency-rising detection period is 3 minutes, the detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely 43Hz is kept unchanged (the current frequency is 40+3 to 43Hz), and meanwhile, the water temperature is detected according to the frequency-rising detection period; if the detected water temperature does not change, continuing to increase by 3Hz, wherein the operation frequency is 46Hz (43+3 is 46Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 46Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the heating stop temperature (H0+2 ℃);
and (3) during frequency reduction:
if P is more than or equal to 60Hz, the frequency reduction amplitude is 10Hz, the frequency reduction detection period is 30 seconds, detection is carried out once every 30 seconds, if the detected water temperature is reduced, the current frequency is kept unchanged, namely, the current frequency is kept unchanged at 50Hz (the current frequency is 60-10 Hz-50 Hz), and meanwhile, the water temperature is detected according to the frequency reduction detection period; if the detected water temperature does not change, continuously increasing by 10Hz, wherein the operation frequency is 40Hz (50-10: 40Hz), if the detected water temperature drops, keeping the current frequency unchanged, namely keeping 40Hz, and the like until the operation frequency reaches the minimum operation frequency of 30Hz, or when the detected water temperature is the same as the set temperature once every 30 seconds (H0: H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the heating stop temperature (H0+2 ℃).
Keeping the current frequency running:
if the current water temperature is the same as the set temperature, the current frequency is kept to operate for 20 minutes until the set operation period is reached, the frequency is increased after the set operation period is reached, and the current water temperature is increased to the heating shutdown temperature (H0+2 ℃) to shut down.
When the temperature difference is large, the heating speed is increased by greatly increasing the frequency rising amplitude, if the water temperature can rise in the frequency rising detection period, the water is operated according to the current frequency, the operation of rising to the maximum frequency is avoided, and the temperature overshoot is easily caused because the power consumption of the operation of the maximum frequency is maximum. As the temperature difference becomes smaller, the frequency increasing or decreasing amplitude is reduced, thereby avoiding temperature fluctuation. The frequency increasing interval or the flat interval is judged according to the current water temperature in the frequency increasing detection period or the frequency reducing detection period, the frequency increasing interval or the frequency reducing interval is flexibly changed according to the current water temperature, the temperature fluctuation is reduced, meanwhile, the energy saving is realized, and the heating time of heating is not influenced.
During refrigeration: setting the current water temperature as H1, setting the temperature as H0, setting the minimum operation frequency as 30Hz, the maximum operation frequency as 80Hz, setting the current frequency as P, setting the operation period as 20 minutes, setting the frequency-increasing detection period as 3 minutes, setting the frequency-decreasing detection period as 30 seconds, setting the refrigeration shutdown temperature as H0-1 ℃, setting the frequency-increasing temperature difference as 3, and setting the frequency-decreasing temperature difference as 2.
Starting a variable frequency compressor, running the variable frequency compressor to 40Hz for 3 minutes, and then detecting the current water temperature H1 and the current running frequency;
if H1-H0 > 3, the frequency is increased, if H0-H1 > 2, and if H0 is H1, the current frequency is kept running;
when the frequency is increased:
if H1-H0 is more than 10, the frequency rising amplitude is 10Hz, the frequency rising detection period is 3 minutes, detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely, the current frequency is kept unchanged at 50Hz (the current frequency is 40+10 to 50Hz), and meanwhile, the water temperature is detected according to the frequency rising detection period; if the detected water temperature does not change, continuously increasing 10Hz, wherein the operation frequency is 60Hz (50+10 is 60Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 60Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the refrigeration stop temperature (H0-1 ℃);
if H0-H1 is more than 5 and less than or equal to 10, the frequency rising amplitude is 5Hz, the frequency rising detection period is 3 minutes, detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely 45Hz is kept unchanged (the current frequency is 40+5 to 45Hz), and meanwhile, the water temperature is detected according to the frequency rising detection period; if the detected water temperature does not change, continuously increasing 5Hz, wherein the operation frequency is 50Hz (45+5 is 50Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 50Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the refrigeration stop temperature (H0-1 ℃);
if the frequency is more than 3 and less than or equal to H0-H1 and less than or equal to 5, the frequency-rising amplitude is 3Hz, the frequency-rising detection period is 3 minutes, the detection is carried out once every 3 minutes, if the detected water temperature rises, the current frequency is kept unchanged, namely 43Hz is kept unchanged (the current frequency is 40+3 to 43Hz), and meanwhile, the water temperature is detected according to the frequency-rising detection period; if the detected water temperature does not change, continuing to increase by 3Hz, wherein the operation frequency is 46Hz (43+3 is 46Hz), if the detected water temperature rises, keeping the current frequency unchanged, namely keeping 46Hz, and the like until the operation frequency reaches the maximum operation frequency of 80Hz, or when the detected water temperature detected every 3 minutes is the same as the set temperature (H0 is H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the refrigeration stop temperature (H0-1 ℃);
and (3) during frequency reduction:
if P is more than or equal to 60Hz, the frequency reduction amplitude is 10Hz, the frequency reduction detection period is 30 seconds, detection is carried out once every 30 seconds, if the detected water temperature is reduced, the current frequency is kept unchanged, namely, the current frequency is kept unchanged at 50Hz (the current frequency is 60-10 Hz-50 Hz), and meanwhile, the water temperature is detected according to the frequency reduction detection period; if the detected water temperature does not change, continuously increasing 10Hz, wherein the operation frequency is 40Hz (50-10 to 40Hz), if the detected water temperature drops, keeping the current frequency unchanged, namely keeping 40Hz, and the like until the operation frequency reaches the minimum operation frequency of 30Hz, or when the detected water temperature is the same as the set temperature once every 30 seconds (H0 to H1), keeping the current frequency to operate, or stopping when the detected water temperature in the detection period reaches the refrigeration stop temperature (H0-1 ℃).
Keeping the current frequency running:
if the current water temperature is the same as the set temperature, the current frequency is kept to operate to the set operation period for 20 minutes, the frequency is increased after the set operation period is reached, and the current water temperature is increased to the refrigeration shutdown temperature (H0-1 ℃) to shut down.
When the temperature difference is large, the refrigerating speed is increased by greatly increasing the frequency rising amplitude, if the water temperature can rise in the frequency rising detection period, the water is operated according to the current frequency, the operation of rising to the maximum frequency is avoided, and the temperature overshoot is easily caused because the power consumption of the operation of the maximum frequency is maximum. As the temperature difference becomes smaller, the frequency increasing or decreasing amplitude is reduced, thereby avoiding temperature fluctuation. The frequency increasing interval or the flat interval is judged according to the current water temperature in the frequency increasing detection period or the frequency reducing detection period, the frequency increasing interval or the frequency reducing interval is flexibly changed according to the current water temperature, the temperature fluctuation is reduced, meanwhile, the energy saving is realized, and the temperature increasing time of refrigeration is not influenced.
Claims (10)
1. The frequency conversion control method of the heat pump water heater or the heat pump water cooling and heating machine is characterized by comprising the following steps of:
detecting the current water temperature and the current frequency of the variable frequency compressor;
during heating:
if the difference between the set temperature and the current water temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set heating shutdown temperature;
if the difference between the current water temperature and the set temperature is larger than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the heating shutdown temperature;
if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to a set operation period, the current frequency is increased to the heating shutdown temperature to shut down;
during refrigeration:
if the difference between the current water temperature and the set temperature is larger than the set frequency-raising temperature difference, raising the frequency to the set temperature or raising the frequency to the set refrigeration shutdown temperature;
if the difference between the set temperature and the current water temperature is greater than the set frequency reduction temperature difference, reducing the frequency to the set temperature or reducing the frequency to the refrigeration shutdown temperature;
if the current water temperature is the same as the set temperature, the current frequency is kept to operate, and if the current frequency is kept to operate to a set operation period, the current frequency is increased to the refrigeration shutdown temperature to shutdown;
the set temperature is a set target temperature, and the current water temperature is a water tank temperature or an air conditioner return water temperature.
2. The heat pump water heater or the heat pump water chiller-heater frequency conversion control method according to claim 1, wherein the frequency-increasing temperature difference is 1-4; the temperature difference of the frequency reduction is 1-4.
3. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 1,
the method comprises the steps that during frequency rising, the current water temperature is detected according to a set frequency rising amplitude, if the water temperature detected in the frequency rising detection period can rise or fall, the current frequency is kept running, if the water temperature detected in the frequency rising detection period does not change, the frequency rising is continued according to the set frequency rising amplitude, if the frequency rising reaches the maximum running frequency, the maximum running frequency is kept running, if the water temperature detected in the frequency rising detection period is the same as the set temperature, the current frequency is kept running, and if the water temperature detected in the frequency rising detection period reaches the heating shutdown temperature or the refrigerating shutdown temperature, the machine is shut down;
the method comprises the steps of reducing the frequency according to a set frequency reduction amplitude during frequency reduction, detecting the current water temperature according to a set frequency reduction detection period, keeping the current frequency running if the water temperature detected in the frequency reduction detection period can rise or fall, continuing to reduce the frequency according to the set frequency reduction amplitude if the water temperature detected in the frequency reduction detection period does not change, keeping the minimum running frequency running if the frequency is reduced to the minimum running frequency, keeping the current frequency running if the water temperature detected in the frequency reduction detection period is the same as the set temperature, and stopping the machine if the water temperature detected in the frequency reduction detection period reaches a heating shutdown temperature or a refrigerating shutdown temperature.
4. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 3,
at least two frequency boosting intervals are set during the frequency boosting, the frequency boosting amplitude of the adjacent frequency boosting intervals is different, and the frequency boosting detection period is different or remains unchanged;
at least two frequency reduction intervals are set during frequency reduction, the frequency reduction amplitude of adjacent frequency reduction intervals is different, and the frequency reduction detection period is different or remains unchanged.
5. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 4,
the frequency increasing intervals are three according to the temperature difference between the current water temperature and the set temperature, and are respectively greater than the frequency increasing temperature difference and less than or equal to 5, greater than 5 and less than or equal to 10 and greater than 10;
when the frequency raising interval is greater than the frequency raising temperature difference and less than or equal to 5, the frequency raising amplitude is 1-3Hz, and the frequency raising detection period is 1-5 minutes;
when the frequency boosting interval is more than 5 and less than or equal to 10, the frequency boosting amplitude is 4-8Hz, and the frequency boosting detection period is 1-5 minutes;
when the frequency raising interval is more than 10, the frequency raising amplitude is 9-15Hz, and the frequency raising detection period is 1-5 minutes.
6. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 4,
the frequency reduction intervals are three according to the operating frequency of the variable frequency compressor, and are respectively more than or equal to 60Hz, less than 60Hz and more than or equal to 45Hz, and more than the minimum operating frequency and less than 45 Hz;
when the frequency reduction interval is greater than or equal to 60Hz, the frequency reduction amplitude is 9-15Hz, and the frequency reduction detection period is 1-60 seconds;
when the frequency reduction interval is less than 60Hz and more than or equal to 45Hz, the frequency reduction amplitude is 4-8Hz, and the frequency reduction detection period is 1-60 seconds;
when the frequency reduction interval is greater than the minimum operating frequency and less than 45Hz, the frequency reduction amplitude is 1-3Hz, and the frequency reduction detection period is 1-60 seconds.
7. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 6, wherein the minimum operating frequency is 30 Hz.
8. The frequency conversion control method for the heat pump water heater or the heat pump water cooling and heating machine according to claim 1, wherein the cooling shutdown temperature is 1 ℃ lower than the set temperature, and the heating shutdown temperature is 2 ℃ higher than the set temperature.
9. The frequency conversion control method for the heat pump water heater or the heat pump water chiller/heater according to claim 1, wherein the operation period is 5-30 minutes.
10. The frequency conversion control method for the heat pump water heater or the heat pump water cooling and heating machine according to claim 1, wherein the frequency conversion compressor is operated to 40Hz and 1-5 minutes before being started, and then the frequency is adjusted by detecting the temperature.
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