CN112066623A - Heating power variable defrosting device of air-cooled refrigerator and control method - Google Patents
Heating power variable defrosting device of air-cooled refrigerator and control method Download PDFInfo
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- CN112066623A CN112066623A CN202010880051.3A CN202010880051A CN112066623A CN 112066623 A CN112066623 A CN 112066623A CN 202010880051 A CN202010880051 A CN 202010880051A CN 112066623 A CN112066623 A CN 112066623A
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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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- 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
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/10—Sensors measuring the temperature of the evaporator
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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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer
Abstract
The invention discloses a heating power variable defrosting device and a control method for an air-cooled refrigerator, wherein the device consists of an evaporator, two temperature collectors, a controller, an electronic pressure regulating module, an environment temperature and humidity collector and an electric heater; the device adopts conventional electric heater, arrange in the evaporimeter bottom, two temperature collectors are respectively in order to hug closely in the evaporimeter tubular surface that is close to electric heater and the evaporimeter tubular surface arrangement of keeping away from electric heater, environment humiture collector arranges in the environment, after evaporimeter tubular surface temperature signal and environment humiture signal are gathered on line to the controller, give electronic pressure regulating module with the pressure regulating signal transmission, electronic pressure regulating module adjusts electric heater's power, realize electric heater's variable power heating defrosting, can match different frosting volume and frost layer and melt the demand of in-process different stages to different defrosting heats, avoid electric heater power too high to cause the heat waste, or electric heating power is low to cause the incomplete condition of defrosting to take place.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly relates to a heating power-variable defrosting device of an air-cooled refrigerator and a control method.
Technical Field
The air-cooled refrigerator is widely used due to the timed automatic defrosting, and in order to realize the food freezing and refrigerating functions, the household refrigerator needs to be operated for 24 hours all day, so the power consumption is always concerned, and the energy conservation and consumption reduction are long-term pursuit targets. Air-cooled refrigerator evaporator frosting increases the evaporator heat transfer resistance, resulting in reduced overall efficiency and increased power consumption of the refrigeration system. Therefore, defrosting is particularly important. The common defrosting methods for refrigerators include electric heating defrosting, hot air defrosting, liquid spray defrosting, and the like. Among them, electrically heated defrosting is the most common and common. According to the literature data, the efficiency of the electric heating defrosting mode is only 15-30%, and the improvement of the defrosting efficiency is one of the important research directions.
At present, the electric heating defrosting mostly adopts a full-life full-cycle constant-power electric heater, the power of the electric heater in each defrosting cycle is always maintained at a constant value no matter the frosting amount, in order to ensure that a frost layer can be completely melted during defrosting each time, the power of the electric heater is generally selected according to the maximum frosting amount, and under the condition, when the frosting amount is small, the power of the electric heater is overlarge. Furthermore, throughout the defrosting process, the frost layer undergoes three stages: the frost layer is heated to 0 ℃ from the initial temperature of the surface of the evaporator tube, frost at 0 ℃ is changed into water at 0 ℃ and defrosting water is heated to the final temperature of the surface of the evaporator tube from 0 ℃, the first stage and the third stage are sensible heat exchange without phase change, the second stage is latent heat exchange with phase change, and the latent heat exchange amount is much larger than the sensible heat exchange amount. If the electric heating power is always constant to be the maximum value, the electric heating power is larger for the two sensible heat exchange stages. The larger the power of the electric heater is, the higher the surface temperature of the heater is, the larger the temperature difference between the electric heater and other auxiliary devices such as a frost layer and an evaporator in the box is, and the higher the heat transfer quantity is. Therefore, the power of the electric heater which can match the frost formation amount and the heat required by melting the frost layer is needed, the phenomenon of 'big horse pulling a trolley' is avoided, and the defrosting efficiency of the electric heater is improved.
Disclosure of Invention
Aiming at the problem and the defect of low defrosting efficiency of the electric heater, the invention aims to provide a heating power variable defrosting device and a control method of an air-cooled refrigerator, which can provide the matched power of the electric heater according to the frosting amount and the heat required in the frost layer melting process.
A variable heating power defrosting device of an air-cooled refrigerator comprises an evaporator 101, an electric heater 102, an electronic pressure regulating module 103, a controller 104, two temperature collectors and an environment temperature and humidity collector 107;
the variable heating power defrosting device comprises the following components and connection relations: two temperature collectors arranged on the surface of the tubes of the evaporator 101 are connected to the controller 104; the environment temperature and humidity collector 107 is connected with the controller 104; the controller 104 is connected with the electronic voltage regulating module 103; the electronic pressure regulating module 103 is connected with the electric heater 102.
A first temperature collector 105 closely attached to the surface of the evaporator tube close to the electric heater and a second temperature collector 106 far away from the surface of the evaporator tube of the electric heater, respectively, the coordinates of the first temperature collector 105 and the second temperature collector 106 are:
where x1 is the length of evaporator 101 in the x-axis direction; y1 is the width of evaporator 101 in the y-axis direction; z1 is the height of the evaporator 101 along the z-axis.
According to the control method of the variable heating power defrosting device of the air-cooled refrigerator, the frosting amount of the refrigerator is influenced by the volume size of the refrigerator body, the structural type, the external environmental conditions and the internal refrigeration working condition, and the specific value of the frosting amount is obtained through experimental determination; for a certain air-cooled refrigerator, the volume size, the structural type and the refrigeration working condition are also determined, namely the frosting amount and the moisture content of ambient air are related to the door opening and closing times of the refrigerator, and the frosting amount m of the refrigerator continuously running for 24 hours is tested by adopting the set working condition shown in the following table;
the frost formation amount measured in the experiment is taken as the preset frost formation amount value of various refrigerators with similar volume size, structure type and refrigeration working condition under different working conditions, and the controller 104 collects the ambient temperature and humidityCalculating the moisture content of the ambient air, and setting the number of times of opening and closing the door of the refrigerator every day in the controller 104, thereby obtaining the frosting amount m under different working conditions, as shown in the table above; the heat quantity required by the melting of the frost layer is Q ═ cCreamm(0-Tstart)+m·rFrost water+cWater (W)m(Tend-0), defrosting efficiency of η0Defrosting time of τ0Presetting the maximum power P of the electric heater 102max，
In the formula, Q is the heat required by frost layer melting, kJ; c. CCreamThe specific heat of the frost layer is kJ/kg DEG C; m is the frosting amount obtained by experimental test, kg; t isstartThe initial temperature of the surface of the evaporator tube is acquired by a first temperature collector 105, a second temperature collector 106 and a controller 104; r isFrost waterThe latent heat of the frost stratification into water, kJ/kg; c. CWater (W)The specific heat of water, kJ/kg DEG C; t isendTaking 10 ℃ as a set value for the final temperature of the surface of the evaporator tube; efficiency of defrosting η0The value range is 15-30%; defrost time τ0The value range is 8-15 min.
In the control method, the controller 104 acquires the surface temperatures of the two evaporator tubes acquired by the first temperature acquisition device 105 and the second temperature acquisition device 106 in real time, and transmits a voltage regulating signal to the electronic voltage regulating module 103 after processing and calculation, and the electronic voltage regulating module 103 regulates the voltage and the power of the electric heater 102 so as to realize the variable-power defrosting of the electric heater, wherein the variable-heating-power defrosting step comprises the following steps:
1) the first temperature collector 105 and the second temperature collector 106 collect initial values T of the surface temperatures of the two evaporator tubesstart，TstartIs an indeterminate value, and sets the defrosting end temperature Tend，TendTemperature interval between initial temperature and final temperature of evaporator tube surface [ T ] 10 ℃start，Tend]Are divided into 10 sections;
2) the temperature rise of each stage is
I.e. the temperature interval of the 1 st stage is (T)0，T1]，T0＝Tstart，T1＝Tstart+ Δ T; the temperature interval of the 2 nd stage is (T)1，T2]，T1＝Tstart+ΔT，T2＝Tstart+2 Δ T; the temperature interval of the 3 rd stage is (T)2，T3]，T2＝Tstart+2ΔT，T3＝Tstart+3 Δ T. cndot, the temperature interval of the i-th section is (T)i-1，Ti]，Ti-1＝Tstart+(i-1)·ΔT，Ti＝Tstart+ i.DELTA.T.. cndot, the temperature interval in section 10 is (T)9，T10]，T9＝Tstart+9ΔT，T10＝Tend；
3) The temperature interval containing 0 ℃ in the 10 sections is named as the ith section, namely the phase change process of frost to water exists in the temperature interval of the ith section, and the initial temperature T of the surface of the evaporator tubestartIs uncertain, and therefore the value of i is uncertain, and the value of i will depend on TstartIs changed;
4) the controller 104 collects the ambient air temperature and humidity and calculates the ambient air moisture content to obtain the frost formation amount, and calculates the maximum power P of the electric heater 102 at the frost formation amountmax；
5) The surface temperature T of the evaporator tube close to the electric heater is collected in real time by the first temperature collector 105 and the second temperature collector 106 respectively105And the surface temperature T of the evaporator tube remote from the electric heater106And calculating the average of the two temperatures
And the minimum value T of these two temperaturesmin＝min{T105，T106A controller (104) has a clock function and records defrosting time and total defrosting time of each temperature interval;
6) comparing the average temperature T in step 5)aveUpper limit value T of temperature interval of i-1 sectioni-1Size, if Tave≤Ti-1Is carried out according to step 7), if Tave＞Ti-1Then, executing according to step 8);
7) the controller 104 adjusts the power of the electric heater 102 in the temperature interval of the 1 st segment to the i-1 st segment to
And comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendReturning to the step 5), otherwise, ending;
8) comparing the minimum value T of the temperature in step 5)minAnd the upper limit value T of the temperature interval of the ith sectioniSize, if Tmin≤TiAccording to step 9), if Tmin＞TiThen executing according to the step 10);
9) the controller 104 adjusts the power P of the electric heater 102 in the ith temperature intervali＝PmaxAnd comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendReturning to the step 5), otherwise, ending;
10) the controller 104 adjusts the power of the electric heater 102 in the temperature range of the (i + 1) -10 th section to
And comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendAnd returning to the step 5), otherwise, ending.
Compared with the traditional refrigerator defrosting control strategy of controlling the temperature and defrosting by the constant electric heater power, the invention has the advantages that:
1. maximum power P of variable heating power electric heater (102)maxThe frosting amount is in one-to-one correspondence with the frosting amount, so that the condition that the frosting amount is small, the power of the electric heater is large and the heat is wasted is avoided.
2. The heat required for melting the frost layer is matched to the electric heater power. In the frost layer melting process, the characteristic that sensible heat quantity increased by the temperature of the frost layer or defrosting water is far less than latent heat quantity of water changed by the frost layer is utilized, the power of the electric heater is properly reduced at the stage that the temperature of the frost layer or defrosting water is increased, energy waste caused by the fact that partial heat is transferred to an inner part of the refrigerator by the electric heater due to overlarge power is avoided, defrosting efficiency is improved, and the load of a refrigerating system in an unstable operation state is reduced.
Drawings
Fig. 1 is a schematic diagram of a variable power defrost control apparatus according to the present invention.
FIG. 2 is a schematic diagram of the power variation trend of the electric heater according to the present invention.
FIG. 3 is a schematic diagram of a control flow of the present invention.
Detailed Description
In order to facilitate understanding of the variable power defrost control scheme provided by the present invention, the present invention is described in detail herein with reference to the accompanying drawings and embodiments. This case is merely for reference, and the present invention is not limited thereto.
Example of the implementation
As shown in fig. 1, the variable heating power defrosting device for the air-cooled refrigerator comprises an evaporator 101, an electric heater 102, an electronic pressure regulating module 103, a controller 104, a first temperature collector 105, a second temperature collector 106 and an environment temperature and humidity collector 107; the evaporator 101 is a finned tube evaporator, and the length x width x height of the external dimensions of the evaporator 101 is 300 x 100 x 200 mm.
According to the control method flowchart shown in fig. 3, the first temperature collector 105 and the second temperature collector 106 collect the initial surface temperature T of the evaporator tubestartThe coordinates of the first temperature collector 105 and the second temperature collector 106 are (150mm, 50mm, 50mm) and (150mm, 50mm, 150mm), respectively, and the defrosting end temperature is T at-30 ℃ end10 ℃, temperature interval [ -30,10 ℃ []Are divided into 10 sections; therefore, the temperature rise of each section is (10- (-30))/10 ═ 4 ℃, and the temperature intervals of 10 sections are (-30, -26) respectively]，(-26,-22]，(-22,-18]，(-18,-14]，(-14,-10]，(-10,-6]，(-6,-2]，(-2,2]，(2,6]，(6,10]If the interval including 0 ℃ is the 8 th temperature interval, i is 8. The environmental temperature and humidity is collected by an environmental temperature and humidity collector 107 at 25 ℃/70% RH, and the calculation formula of the moisture content given in the practical heat supply and air conditioning design manual is referred to:
wherein, c8＝-5800.2206；c9＝1.3914993；c10＝-0.04860239；c11＝0.41764768×10-4；c12＝-0.14452093×10-7；c136.5459673; t is the wet air thermodynamic temperature; pq,bSaturated partial pressure of water vapor;
calculated as relative humidity, ambient air moisture content was 13.92g/kgaThe number of times of opening the door of the refrigerator is set to be 10 times/24 h, and the frosting amount is 0.05 kg. Therefore, the frost layer needs Q ═ c to meltCreamm(0-Tstart)+m·rFrost water+cWater (W)m(Tend-0) ═ 1.9 × 0.05 × 30+0.05 × 334+4.2 × 0.05 × 10 ═ 21.65kJ, defrosting efficiency 25% and defrosting time 10min are obtained, and energy conservation equation Q ═ eta [, ] eta0Pmaxτ0Determining the maximum power P of the variable heating power electric heater 102max140W. The surface temperature T of the evaporator tube near the electric heater is collected in real time by the first temperature collector 105 and the second temperature collector 106105And the surface temperature T of the evaporator tube remote from the electric heater106And calculating the average temperature of the two temperatures in real time
Minimum value T of these two temperaturesmin＝min{T105，T106And recording the defrosting time and the total defrosting time of each temperature interval. Starting the electric heater, starting defrosting, and increasing the surface temperature of the evaporator tube from-30 ℃ when the T is metaveWhen the temperature is less than or equal to minus 2 ℃, the electric heater 102 heats and defrosts with the power P equal to 84W; when the surface temperature of the evaporator tube continues to rise until TaveAt 2 ℃ and TminWhen the temperature is less than or equal to 2 ℃, the electric heater 102 heats and defrosts with power P equal to 140W; when the surface temperature of the evaporator tube rises to TminWhen the temperature is higher than 2 ℃, the electric heater heats and defrosts with the power P of 112W; up to TaveAnd the defrosting is finished at the temperature of more than 10 ℃, and the electric heater 102 is turned off. Power variation of the electric heater 102Referring to FIG. 2, for the present embodiment, the power of the electric heater is set to be within the temperature range of 1 st to 7 th
In the 8 th temperature interval, the power of the electric heater is P ═ Pmax140W, in the temperature interval of 9 th and 10 th sections, the power of the electric heater is
Claims (4)
1. The utility model provides a forced air cooling refrigerator becomes heating power defroster which characterized in that: the device comprises an evaporator (101), an electric heater (102), an electronic pressure regulating module (103), a controller (104), two temperature collectors and an environment temperature and humidity collector (107);
the variable heating power defrosting device comprises the following components and connection relations: two temperature collectors arranged on the surface of the tube of the evaporator (101) are connected with a controller (104); the environment temperature and humidity collector (107) is connected with the controller (104); the controller (104) is connected with the electronic voltage regulating module (103); the electronic pressure regulating module (103) is connected with the electric heater (102).
2. The variable heating power defroster of an air-cooled refrigerator according to claim 1, characterized in that: the two temperature collectors are respectively a first temperature collector (105) which is tightly attached to the surface of the evaporator tube close to the electric heater and a second temperature collector (106) which is far away from the surface of the evaporator tube of the electric heater, and the coordinates of the first temperature collector (105) and the second temperature collector (106) are respectively as follows:
wherein x1 is the length of the evaporator (101) along the x-axis direction; y1 is the width of the evaporator (101) in the y-axis direction; z1 is the height of the evaporator (101) in the z-axis direction.
3. The control method of the variable heating power defrosting device of the air-cooled refrigerator as claimed in claim 1 or 2, characterized in that:
the frost formation amount of the refrigerator is influenced by the volume size, the structural type, the external environmental conditions and the internal refrigeration working condition of the refrigerator, and the specific value of the frost formation amount needs to be obtained through experimental determination; for a certain air-cooled refrigerator, the volume size, the structural type and the refrigeration working condition are also determined, namely the frosting amount and the moisture content of ambient air are related to the door opening and closing times of the refrigerator, and the frosting amount m of the refrigerator continuously running for 24 hours is tested by adopting the set working condition shown in the following table;
taking the frost formation amount measured by an experiment as the preset frost formation amount values of various refrigerators with similar volume size, structural types and refrigeration working conditions under different working conditions, collecting the ambient temperature and humidity by using a controller (104), calculating the ambient air moisture content, and setting the door opening and closing times of the refrigerators each day in the controller (104) so as to obtain the frost formation amount m under different working conditions, wherein the values are shown in the table; the heat quantity required by the melting of the frost layer is Q ═ cCreamm(0-Tstart)+m·rFrost water+cWater (W)m(Tend-0), defrosting efficiency of η0Defrosting time of τ0Presetting the maximum power P of the electric heater (102)max，
In the formula, Q is the heat required by frost layer melting, kJ; c. CCreamThe specific heat of the frost layer is kJ/kg DEG C; m is the frosting amount obtained by experimental test, kg; t isstartThe initial temperature of the surface of the evaporator tube is acquired by a first temperature collector (105), a second temperature collector (106) and a controller (104); r isFrost waterThe latent heat of the frost stratification into water, kJ/kg; c. CWater (W)The specific heat of water, kJ/kg DEG C; t isendTaking 10 ℃ as a set value for the final temperature of the surface of the evaporator tube; efficiency of defrosting η0The value range is 15-30%; defrost time τ0The value range is 8-15 min.
4. The control method according to claim 3, characterized in that: the controller (104) collects the surface temperatures of the two evaporator tubes collected by the first temperature collector (105) and the second temperature collector (106) in real time, after processing and calculation, the voltage regulating signal is transmitted to the electronic voltage regulating module (103), the electronic voltage regulating module (103) regulates the voltage and the power of the electric heater (102) so as to realize the defrosting of the electric heater by changing the power, and the defrosting step by changing the heating power is as follows:
1) the first temperature collector (105) and the second temperature collector (106) collect the initial values T of the surface temperatures of the two evaporator tubesstart，TstartIs an indeterminate value, and sets the defrosting end temperature Tend，TendTemperature interval between initial temperature and final temperature of evaporator tube surface [ T ] 10 ℃start，Tend]Are divided into 10 sections;
2) the temperature rise of each stage is
I.e. the temperature interval of the 1 st stage is (T)0，T1]，T0＝Tstart，T1＝Tstart+ Δ T; the temperature interval of the 2 nd stage is (T)1，T2]，T1＝Tstart+ΔT，T2＝Tstart+2 Δ T; the temperature interval of the 3 rd stage is (T)2，T3]，T2＝Tstart+2ΔT，T3＝Tstart+3 Δ T. cndot, the temperature interval of the i-th section is (T)i-1，Ti]，Ti-1＝Tstart+(i-1)·ΔT，Ti＝Tstart+ i.DELTA.T.. cndot, the temperature interval in section 10 is (T)9，T10]，T9＝Tstart+9ΔT，T10＝Tend；
3) The temperature interval containing 0 ℃ in the 10 sections is named as the ith section, namely the phase change process of frost to water exists in the temperature interval of the ith section, and the initial temperature T of the surface of the evaporator tubestartIs uncertain, and therefore the value of i is uncertain, and the value of i will depend on TstartIs changed;
4) the controller (104) collects the temperature and the humidity of the ambient air and calculates the moisture content of the ambient air to obtain the frosting amount, and calculates the maximum power P of the electric heater (102) under the frosting amountmax；
5) The surface temperature T of the evaporator tube close to the electric heater is respectively collected in real time by a first temperature collector (105) and a second temperature collector (106)105And the surface temperature T of the evaporator tube remote from the electric heater106And calculating the average of the two temperatures
And the minimum value T of these two temperaturesmin＝min{T105，T106A controller (104) has a clock function and records defrosting time and total defrosting time of each temperature interval;
6) comparing the average temperature T in step 5)aveUpper limit value T of temperature interval of i-1 sectioni-1Size, if Tave≤Ti-1Is carried out according to step 7), if Tave＞Ti-1Then, executing according to step 8);
7) the controller (104) adjusts the power of the electric heater (102) in the temperature interval of the 1 st to the i-1 st section to be
And comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendReturning to the step 5), otherwise, ending;
8) comparing the minimum value T of the temperature in step 5)minAnd the upper limit value T of the temperature interval of the ith sectioniSize, if Tmin≤TiAccording to step 9), if Tmin＞TiThen executing according to the step 10);
9) the controller (104) adjusts the power of the electric heater (102) in the ith temperature interval to be Pi＝PmaxAnd comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendReturning to the step 5), otherwise, ending;
10) the controller (104) adjusts the power of the electric heater (102) in the temperature range of the (i + 1) th to the (10) th section to be
And comparing the average temperature T in step 5)aveAnd defrosting end temperature TendIf T isave≤TendAnd returning to the step 5), otherwise, ending.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112197489A (en) * | 2020-07-17 | 2021-01-08 | Tcl家用电器（合肥）有限公司 | Evaporator defrosting method and device, refrigerator, computer equipment and storage medium |
| WO2022143634A1 (en) * | 2020-12-29 | 2022-07-07 | 海尔智家股份有限公司 | Refrigerator |
| CN114877564A (en) * | 2022-05-30 | 2022-08-09 | 瑞祥电子科技(山东)有限公司 | Automatic defrosting system of air heat source pump |
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