CN107957156A - Net for air-source heat pump units defrosting control method - Google Patents
Net for air-source heat pump units defrosting control method Download PDFInfo
- Publication number
- CN107957156A CN107957156A CN201711200478.9A CN201711200478A CN107957156A CN 107957156 A CN107957156 A CN 107957156A CN 201711200478 A CN201711200478 A CN 201711200478A CN 107957156 A CN107957156 A CN 107957156A
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- Prior art keywords
- defrosting
- temperature
- heat pump
- source heat
- air source
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- 238000010257 thawing Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009825 accumulation Methods 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007710 freezing Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention proposes a kind of net for air-source heat pump units defrosting control method, net for air-source heat pump units sets outdoor environment temperature sensor, outdoor environment humidity transmitter and surface cooler fin temperature sensor, control unit connection outdoor environment temperature sensor, outdoor environment humidity transmitter and the surface cooler fin temperature sensor of net for air-source heat pump units, comprise the following steps:Step 1: dew-point temperature is calculated by outdoor temperature, outside humidity；Step 2: into defrosting first；Step 3: into automatic defrosting；Step 4: exit defrosting.Beneficial effects of the present invention：It is accurate to control net for air-source heat pump units to enter, exit defrosting in the area that humidity is larger, accumulation white on surface cooler is avoided, defrosting is totally, thoroughly；When temperature is relatively low, whether accurate judgement needs to control net for air-source heat pump units to enter defrosting, avoids unit from frequently entering defrosting, realizes defrosting time and interval intelligent decision, automatic adjustment, improves net for air-source heat pump units heating effect, energy consumption is relatively low.
Description
Technical Field
The invention relates to the technical field of air source heat pump units, in particular to a defrosting control method of an air source heat pump unit.
Background
The existing air source heat pump unit judges whether the air source heat pump unit is defrosted or not according to the outdoor environment temperature, the fin temperature and the defrosting interval. The defrosting process is unheated, and if the exhaust temperature is low and the weather is too cold, defrosting is always operated, so that the indoor heating effect is poor.
The existing air source heat pump unit has poorer heating effect in areas with higher humidity. In areas with high humidity, after the air source heat pump unit operates for a plurality of defrosting cycles, when the ambient temperature is close to about 2 ℃, because the ambient temperature is related to defrosting intervals, the defrosting intervals are long when the ambient temperature is high, so that the surface air cooler can be defrosted only by thick frost, and the condition of quitting defrosting is met when the frost is not completely removed. The defrosting process is repeated, the defrosting on the surface air cooler is not clean and thorough, and the defrosting is not clean, so that the frosting on the surface air cooler is not uniform. When the ambient temperature is continuously reduced (lower than-5 ℃), the humidity of the general environment can be greatly reduced, although the temperature is low, frosting is not caused, and at the time, the unit can frequently enter the defrosting mode to defrost, so that the heating effect of the unit is influenced.
Disclosure of Invention
The invention aims to provide a defrosting control method of an air source heat pump unit, which solves the problem of poor heating effect caused by the fact that the conventional air source heat pump unit performs defrosting by mistake in a region with high humidity.
The invention provides a defrosting control method for an air source heat pump unit, wherein an outdoor environment temperature sensor, an outdoor environment humidity transmitter and a surface cooler fin temperature sensor are arranged on the air source heat pump unit, and a control unit on the air source heat pump unit is in signal connection with the outdoor environment temperature sensor, the outdoor environment humidity transmitter and the surface cooler fin temperature sensor, and the defrosting control method comprises the following steps:
step one, an outdoor environment temperature sensor detects outdoor temperature, an outdoor environment humidity transmitter detects outdoor humidity, and a control unit calculates dew point temperature according to the outdoor temperature and the outdoor humidity;
step two, entering automatic defrosting
The surface cooler fin temperature sensor detects the temperature of fins on the surface cooler, the control unit controls the air source heat pump unit to enter an automatic defrosting mode when the control unit judges that the following four conditions are met simultaneously,
condition 1, the fin temperature is lower than the dew point temperature,
the condition 2 is that the change rate of the wing temperature reaches the set change rate of the wing temperature,
wherein, the set fin temperature change rate is a set value, the fin temperature change rate is the fin temperature-fin temperature for starting the frost accumulation timing, the frost accumulation timing is started when the following three conditions are met, the condition 21 that the running time of the compressor is more than the set time for starting the detection of the unit, the condition 22 that the fin temperature is lower than the set temperature for starting the defrosting, the condition 23 that the fin temperature is lower than the outdoor temperature,
and 3, the outlet water temperature of the unit is higher than a first temperature value, the first temperature value is a starting threshold value of the anti-freezing starting water pump in the unit,
condition 4, the compressor run time is greater than the compressor minimum run time;
step three, quitting defrosting
The control unit controls the air source heat pump unit to quit defrosting.
Further, the method also comprises the following steps between the first step and the second step: enter the first defrosting
When the air source heat pump unit is started for the first time and the control unit judges that the following four conditions are met simultaneously, the control unit controls the air source heat pump unit to enter a first defrosting mode,
the condition 1 is that the running time of the compressor is longer than the set time for starting the detection of the unit,
condition 2, the operation time of the compressor is longer than the first defrosting interval set time,
condition 3, the temperature of the fins is lower than the set defrosting starting temperature,
condition 4, the fin temperature is lower than the dew point temperature.
Furthermore, in the third step, when the control unit judges that any one of the following four conditions is met, the control unit controls the air source heat pump unit to quit defrosting,
condition 1, the temperature of the fins is higher than the defrosting ending set temperature,
condition 2, the compressor system has protective shutdown action,
condition 3, the defrosting operation time reaches the defrosting setting time,
and 4, the outlet water temperature of the unit is lower than a second temperature value, and the second temperature value is a starting threshold value for starting the compressor in the unit in an anti-freezing manner.
Further, if the control unit judges that the condition that the fin temperature is higher than the set defrosting end temperature is met in the third step, the control unit controls the air source heat pump unit to quit defrosting, and after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode in the second step, the control unit controls the set fin temperature change rate to increase by 1 ℃.
Further, if the control unit judges and controls the air source heat pump unit to exit from defrosting in the step three, and the defrosting operation time is less than the defrosting setting time, the control unit controls the setting fin temperature change rate to be reduced by 1 ℃ after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode again in the step two.
Further, the defrosting operation time is 70% of the defrosting setting time.
Compared with the prior art, the defrosting control method of the air source heat pump unit has the following characteristics and advantages:
according to the defrosting control method of the air source heat pump unit, the air source heat pump unit is accurately controlled to enter and exit defrosting in areas with high humidity, accumulation of frost on a surface air cooler is avoided, and defrosting is clean and thorough; when the temperature is lower, whether the air source heat pump unit needs to be controlled to enter defrosting or not is accurately judged, the unit is prevented from frequently entering defrosting, the defrosting interval and the defrosting operation time at each time are judged by the working condition of actual operation to obtain a non-fixed value, intelligent judgment and automatic adjustment of defrosting time and interval are realized, the heating effect of the air source heat pump unit is improved, and the energy consumption is lower.
The features and advantages of the present invention will become more apparent from the detailed description of the invention when taken in conjunction with the drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a defrosting control method for an air source heat pump unit according to an embodiment of the present invention.
Detailed Description
An outdoor environment temperature sensor, an outdoor environment humidity transmitter and a surface cooler fin temperature sensor are arranged on the air source heat pump unit. The outdoor environment temperature sensor is used for detecting the outdoor temperature, the outdoor environment humidity transmitter is used for detecting the outdoor humidity, and the surface cooler fin temperature sensor is used for detecting the temperature of fins on the surface cooler. And a control unit on the air source heat pump unit is in signal connection with the outdoor environment temperature sensor, the outdoor environment humidity transmitter and the surface cooler fin temperature sensor.
In the heating mode of the air source heat pump unit, as shown in fig. 1, the embodiment provides a defrosting control method of the air source heat pump unit, which includes the following steps:
step one, an outdoor environment temperature sensor detects outdoor temperature, an outdoor environment humidity transmitter detects outdoor humidity, and a control unit calculates dew point temperature according to the outdoor temperature and the outdoor humidity.
And step two, defrosting for the first time to remove the accumulated snow on the surface air cooler of the outdoor unit and avoid the accumulated snow from being converted into frost.
When the air source heat pump unit is started for the first time and the control unit judges that the following four conditions are met simultaneously, the control unit controls the air source heat pump unit to enter a first defrosting mode,
wherein,
the condition 1 is that the running time of the compressor is longer than the set time for starting the detection of the unit,
condition 2, the operation time of the compressor is longer than the first defrosting interval set time,
condition 3, the temperature of the fins is lower than the set defrosting starting temperature,
condition 4, the fin temperature is lower than the dew point temperature.
Step three, entering automatic defrosting
The surface cooler fin temperature sensor detects the temperature of fins on the surface cooler, the control unit controls the air source heat pump unit to enter an automatic defrosting mode when the control unit judges that the following four conditions are met simultaneously,
wherein,
condition 1, the fin temperature is lower than the dew point temperature,
the condition 2 is that the fin temperature change rate reaches a set fin temperature change rate, wherein the set fin temperature change rate is a set value (non-fixed value), the fin temperature change rate is the fin temperature at which the frost accumulation timing is started, the frost accumulation timing is started when the three conditions are met, the condition 21 is that the running time of a compressor is greater than the set time for starting the detection of a unit, the condition 22 is that the fin temperature is lower than the set temperature for starting the defrosting, the condition 23 is that the fin temperature is lower than the outdoor temperature,
and 3, the outlet water temperature of the unit is higher than a first temperature value, the first temperature value is a starting threshold value of the anti-freezing starting water pump in the unit,
condition 4, the compressor run time is greater than the compressor minimum run time.
Step four, quitting defrosting
When the control unit judges that any one of the following four conditions is met, the control unit controls the air source heat pump unit to quit defrosting, wherein the temperature of the fins is higher than the set temperature for defrosting ending under the condition 1, the temperature of the fins is higher than the set temperature for defrosting ending, the compressor system is protected to stop operating under the condition 2, the defrosting operation time reaches the set time for defrosting under the condition 3, the water outlet temperature of the unit is lower than a second temperature value, and the second temperature value is a starting threshold value for starting the compressor for preventing freezing in the unit.
If the control unit judges that the condition that the fin temperature is higher than the defrosting ending set temperature is met in the step four, the control unit controls the air source heat pump unit to quit defrosting, and after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode in the step three, the control unit controls the set fin temperature change rate to be increased by 1 ℃ so as to judge the defrosting interval and the defrosting operation time according to the working condition of the actual operation of the unit.
If the control unit judges and controls the air source heat pump unit to exit the defrosting mode in the fourth step, and the defrosting operation time is less than 70% of the defrosting setting time, the control unit controls the setting fin temperature change rate to be reduced by 1 ℃ after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode again in the third step, so that the defrosting interval and the defrosting operation time are judged according to the working condition of the actual operation of the unit.
According to the defrosting control method of the air source heat pump unit, the air source heat pump unit is accurately controlled to enter and exit defrosting in an area with high humidity, accumulation of frost on a surface air cooler is avoided, and defrosting is clean and thorough; when the temperature is lower, whether the air source heat pump unit needs to be controlled to enter defrosting or not is accurately judged, the unit is prevented from frequently entering defrosting, the defrosting interval and the defrosting operation time at each time are judged by the working condition of actual operation to obtain a non-fixed value, intelligent judgment and automatic adjustment of defrosting time and interval are realized, the heating effect of the air source heat pump unit is improved, and the energy consumption is lower.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (6)
1. The utility model provides an air source heat pump set defrosting control method, is provided with outdoor environment temperature sensor, outdoor environment humidity changer and surface cooler fin temperature sensor on the air source heat pump set, and the last control unit signal connection outdoor environment temperature sensor of air source heat pump set, outdoor environment humidity changer and surface cooler fin temperature sensor, its characterized in that includes following step:
step one, an outdoor environment temperature sensor detects outdoor temperature, an outdoor environment humidity transmitter detects outdoor humidity, and a control unit calculates dew point temperature according to the outdoor temperature and the outdoor humidity;
step two, entering automatic defrosting
The surface cooler fin temperature sensor detects the temperature of fins on the surface cooler, the control unit controls the air source heat pump unit to enter an automatic defrosting mode when the control unit judges that the following four conditions are met simultaneously,
condition 1, the fin temperature is lower than the dew point temperature,
the condition 2 is that the change rate of the wing temperature reaches the set change rate of the wing temperature,
wherein, the set fin temperature change rate is a set value, the fin temperature change rate is the fin temperature-fin temperature for starting the frost accumulation timing, the frost accumulation timing is started when the following three conditions are met, the condition 21 that the running time of the compressor is more than the set time for starting the detection of the unit, the condition 22 that the fin temperature is lower than the set temperature for starting the defrosting, the condition 23 that the fin temperature is lower than the outdoor temperature,
and 3, the outlet water temperature of the unit is higher than a first temperature value, the first temperature value is a starting threshold value of the anti-freezing starting water pump in the unit,
condition 4, the compressor run time is greater than the compressor minimum run time;
step three, quitting defrosting
The control unit controls the air source heat pump unit to quit defrosting.
2. The defrosting control method of the air source heat pump unit according to claim 1, characterized by further comprising the following steps between the first step and the second step: enter the first defrosting
When the air source heat pump unit is started for the first time and the control unit judges that the following four conditions are met simultaneously, the control unit controls the air source heat pump unit to enter a first defrosting mode,
the condition 1 is that the running time of the compressor is longer than the set time for starting the detection of the unit,
condition 2, the operation time of the compressor is longer than the first defrosting interval set time,
condition 3, the temperature of the fins is lower than the set defrosting starting temperature,
condition 4, the fin temperature is lower than the dew point temperature.
3. The defrosting control method of the air source heat pump unit according to claim 1, characterized in that: in the third step, when the control unit judges that any one of the following four conditions is met, the control unit controls the air source heat pump unit to quit defrosting,
condition 1, the temperature of the fins is higher than the defrosting ending set temperature,
condition 2, the compressor system has protective shutdown action,
condition 3, the defrosting operation time reaches the defrosting setting time,
and 4, the outlet water temperature of the unit is lower than a second temperature value, and the second temperature value is a starting threshold value for starting the compressor in the unit in an anti-freezing manner.
4. The defrosting control method of the air source heat pump unit according to claim 3, characterized in that: if the control unit judges that the condition that the fin temperature is higher than the set defrosting end temperature is met in the third step, the control unit controls the air source heat pump unit to quit defrosting, and after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode in the second step, the control unit controls the set fin temperature change rate to increase by 1 ℃.
5. The defrosting control method of the air source heat pump unit according to claim 3, characterized in that: if the defrosting operation time is less than the defrosting setting time when the control unit judges and controls the air source heat pump unit to exit defrosting in the third step, the control unit controls the setting fin temperature change rate to be reduced by 1 ℃ after the control unit judges and controls the air source heat pump unit to enter the automatic defrosting mode again in the second step.
6. The defrosting control method of the air source heat pump unit according to claim 5, characterized in that: the defrost run time is 70% of the defrost set time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711200478.9A CN107957156B (en) | 2017-11-27 | 2017-11-27 | Defrosting control method for air source heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711200478.9A CN107957156B (en) | 2017-11-27 | 2017-11-27 | Defrosting control method for air source heat pump unit |
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| CN107957156A true CN107957156A (en) | 2018-04-24 |
| CN107957156B CN107957156B (en) | 2020-03-24 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028639A (en) * | 2018-07-03 | 2018-12-18 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
| CN109579384A (en) * | 2018-11-23 | 2019-04-05 | 广东日出东方空气能有限公司 | The Defrost method of air friction drag |
| CN109654774A (en) * | 2018-12-18 | 2019-04-19 | 青岛经济技术开发区海尔热水器有限公司 | Defrosting control method and air source heat pump system |
| CN109798703A (en) * | 2019-01-15 | 2019-05-24 | 广东芬尼克兹节能设备有限公司 | Heat pump unit and its defrosting control method, device |
| CN110715482A (en) * | 2019-08-30 | 2020-01-21 | 浙江正泰能效科技有限公司 | Defrosting method of air source heat pump unit |
| CN111174437A (en) * | 2018-11-13 | 2020-05-19 | 艾欧史密斯(中国)热水器有限公司 | Control method of heat pump water heater |
| CN111426109A (en) * | 2020-03-16 | 2020-07-17 | 科希曼电器有限公司 | Air source heat pump defrosting system and method based on temperature and wind pressure difference detection |
| CN111765665A (en) * | 2020-06-17 | 2020-10-13 | 珠海格力电器股份有限公司 | Automatic and accurate defrosting control method and device and heat pump water heater |
| CN111879037A (en) * | 2020-08-04 | 2020-11-03 | 山东三土能源股份有限公司 | Air source heat pump water chilling unit frost suppression and defrosting equipment for different humidity and frost suppression and defrosting control method |
| CN112212468A (en) * | 2020-09-14 | 2021-01-12 | 海信（山东）空调有限公司 | Control method of air conditioner |
| CN113375289A (en) * | 2021-06-17 | 2021-09-10 | 中洁环境科技(西安)集团有限公司 | Defrosting method and device for full-quality air conditioner |
| WO2021227365A1 (en) * | 2020-05-09 | 2021-11-18 | 艾默生环境优化技术(苏州)有限公司 | Anti-freezing protection method, anti-freezing protection system, and heat pump unit of water system |
| CN113847741A (en) * | 2021-08-30 | 2021-12-28 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
| CN113970166A (en) * | 2021-09-30 | 2022-01-25 | 青岛海享智科技有限公司 | Defrosting control method for air conditioner and air conditioner |
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| CN109028639B (en) * | 2018-07-03 | 2019-10-22 | 浙江国祥股份有限公司 | A kind of defrosting control method and air source heat pump of air source heat pump |
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| CN109579384A (en) * | 2018-11-23 | 2019-04-05 | 广东日出东方空气能有限公司 | The Defrost method of air friction drag |
| CN109654774A (en) * | 2018-12-18 | 2019-04-19 | 青岛经济技术开发区海尔热水器有限公司 | Defrosting control method and air source heat pump system |
| CN109798703A (en) * | 2019-01-15 | 2019-05-24 | 广东芬尼克兹节能设备有限公司 | Heat pump unit and its defrosting control method, device |
| CN109798703B (en) * | 2019-01-15 | 2021-03-02 | 广东芬尼克兹节能设备有限公司 | Heat pump unit and defrosting control method and device thereof |
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| CN110715482B (en) * | 2019-08-30 | 2023-08-08 | 浙江正泰能效科技有限公司 | Defrosting method of air source heat pump unit |
| CN111426109A (en) * | 2020-03-16 | 2020-07-17 | 科希曼电器有限公司 | Air source heat pump defrosting system and method based on temperature and wind pressure difference detection |
| WO2021227365A1 (en) * | 2020-05-09 | 2021-11-18 | 艾默生环境优化技术(苏州)有限公司 | Anti-freezing protection method, anti-freezing protection system, and heat pump unit of water system |
| CN111765665A (en) * | 2020-06-17 | 2020-10-13 | 珠海格力电器股份有限公司 | Automatic and accurate defrosting control method and device and heat pump water heater |
| CN111879037A (en) * | 2020-08-04 | 2020-11-03 | 山东三土能源股份有限公司 | Air source heat pump water chilling unit frost suppression and defrosting equipment for different humidity and frost suppression and defrosting control method |
| CN112212468B (en) * | 2020-09-14 | 2021-12-14 | 海信（山东）空调有限公司 | Control method of air conditioner |
| CN112212468A (en) * | 2020-09-14 | 2021-01-12 | 海信（山东）空调有限公司 | Control method of air conditioner |
| CN113375289A (en) * | 2021-06-17 | 2021-09-10 | 中洁环境科技(西安)集团有限公司 | Defrosting method and device for full-quality air conditioner |
| CN113847741A (en) * | 2021-08-30 | 2021-12-28 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
| CN113970166A (en) * | 2021-09-30 | 2022-01-25 | 青岛海享智科技有限公司 | Defrosting control method for air conditioner and air conditioner |
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