CN114992972B - Defrosting control method for air-cooled refrigerator - Google Patents
Defrosting control method for air-cooled refrigerator Download PDFInfo
- Publication number
- CN114992972B CN114992972B CN202210572602.9A CN202210572602A CN114992972B CN 114992972 B CN114992972 B CN 114992972B CN 202210572602 A CN202210572602 A CN 202210572602A CN 114992972 B CN114992972 B CN 114992972B
- Authority
- CN
- China
- Prior art keywords
- air
- defrosting
- refrigerator
- evaporator
- refrigerating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010257 thawing Methods 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005057 refrigeration Methods 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000004364 calculation method Methods 0.000 claims description 59
- 238000004422 calculation algorithm Methods 0.000 claims description 30
- 238000013461 design Methods 0.000 claims description 11
- 230000008014 freezing Effects 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000009191 jumping Effects 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- F25D21/008—Defroster control by timer
-
- 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
- F25D2600/00—Control issues
- F25D2600/02—Timing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention discloses a defrosting control method of an air-cooled refrigerator, which comprises the following steps of: the first step is that in the continuous operation of the refrigerator, when judging that the condition is met, the electric control device judges whether the frosting basic condition is met; judging whether the condition is that the compressor is started or the fan is started or the refrigeration air door is started; the frosting basic condition is that the compressor is started, the fan is started and the refrigeration air door is opened; performing a second step operation when the frosting basic conditions are met; the second step is to calculate the air water content in a time-sharing way and accumulate the results of calculating the air water content in each time-sharing way, when the accumulated air water content M passing through the evaporator is more than or equal to X, the electric control device controls the defrosting device to defrost, and then the first step is executed again. The invention innovates the technical route of defrosting of the air-cooled refrigerator, and enables the defrosting process of the air-cooled refrigerator to be more matched with the actual frosting quantity of the evaporator, thereby taking into account the defrosting effect and the energy-saving aim.
Description
Technical Field
The invention relates to the technical field of refrigerators, in particular to a defrosting control method of an air-cooled refrigerator.
Background
With the continuous change of demands of the consumer market for refrigerators, air-cooled refrigerators have become the mainstream. The defrosting of the air-cooled refrigerator at present mainly determines when to start defrosting by calculating the accumulated refrigerating time of the press.
When the ambient humidity and the humidity in the refrigerator are lower, the frosting quantity on the evaporator of the refrigerator is small, the refrigerating efficiency of the refrigerator is not affected, and if defrosting is started when the refrigerating accumulation time of the press reaches a preset time, ineffective defrosting (which is not necessary for defrosting originally) is formed, so that unnecessary power consumption is increased, and meanwhile, the temperature of the compartment is increased, and the refrigerating effect is affected.
On the one hand, under the dependence of the path developed by the prior art, the technical route for carrying out the defrosting control of the air-cooled refrigerator according to the accumulated running time of the compressor cannot be jumped out by the person skilled in the art;
on the other hand, the existing technical route is jumped, the reasonable factors of the frosting of the refrigerator evaporator are reconsidered, and the reasonable water content calculation algorithm and the defrosting control method are designed, so that creative labor is also required.
Thus, although the refrigerator has a history of development for hundreds of years and the air-cooled refrigerator has a history of development for decades, a defrosting control method of the air-cooled refrigerator for defrosting control according to the moisture content of air has not been developed for a long time.
Disclosure of Invention
The invention aims to provide a defrosting control method of an air-cooled refrigerator, which changes the technical route of controlling defrosting by accumulating running time of a compressor in the prior art, and aims to accumulate the effective air moisture content of an evaporator (the air coming from a freezing chamber to the evaporator is the ineffective air moisture content) for defrosting control, so that the defrosting and the frosting quantity of the evaporator are more matched, and the phenomenon of ineffective defrosting is avoided.
In order to achieve the above purpose, the invention discloses a defrosting control method of an air-cooled refrigerator, which is used for the air-cooled refrigerator, wherein a refrigerating chamber and a freezing chamber are arranged in the refrigerator body of the air-cooled refrigerator, a refrigerating system is arranged in the refrigerator body, the refrigerating system comprises a compressor, a condenser, a throttling device and an evaporator which are circularly communicated through a refrigerant pipeline, and a defrosting device and a defrosting temperature sensor are arranged at the evaporator; the refrigerator is characterized in that an air channel passing through the evaporator is arranged in the refrigerator, a refrigeration air inlet and a refrigeration air return opening are arranged in the refrigeration chamber, the direction of air flow is taken as the downstream direction, the refrigeration air inlet is communicated with the air channel at the downstream of the evaporator, and a refrigeration air door for controlling the switch of the refrigeration air inlet is arranged on the air channel at the refrigeration air inlet; the refrigerating return air inlet is communicated with an air channel at the upstream of the evaporator, and a fan for driving air to circularly flow and flow through the evaporator is arranged in the air channel; a refrigerating temperature sensor and an in-box humidity sensor are arranged in the refrigerating chamber, and an out-box humidity sensor is arranged outside the box body; the refrigerating chamber has a refrigerating door having a door sensor;
the inside of the box body is also provided with an electric control device, and a defrosting temperature sensor, a compressor, a fan, a door sensor, a refrigerating air door, a defrosting device, an inside humidity sensor, an outside humidity sensor and a refrigerating temperature sensor are all connected with the electric control device;
the electric control device stores a design wind speed v at the refrigerating air inlet and is provided with a timing module; the accumulated air moisture content passing through the evaporator during the operation of the refrigerator is called M;
in the refrigerator design stage, after the refrigerator structure is determined, determining the value of the parameter X and the value of the parameter N through experiments; when M is more than or equal to X, defrosting is started; the meaning of N is: when m=x, the defrosting device working time for ensuring that the defrosting of the evaporator achieves the design effect;
the defrosting control is carried out in the refrigerator operation according to the following steps in sequence:
the first step is that in the continuous operation of the refrigerator, when judging that the condition is met, the electric control device judges whether the frosting basic condition is met;
judging whether the condition is that the compressor is started or the fan is started or the refrigeration air door is started;
the frosting basic condition is that the compressor is started, the fan is started and the refrigeration air door is opened;
re-executing the first step when the frosting basic condition is not satisfied; performing a second step operation when the frosting basic conditions are met;
the second step is to calculate the air water content in a time-sharing way and accumulate the results of calculating the air water content in each time-sharing way, and when the accumulated air water content M passing through the evaporator is more than or equal to X, the electric control device controls the defrosting device to defrost; the second step is finished when defrosting is finished; after the second step is finished, the electric control device returns to execute the first step again.
In the second step, the electric control device calculates the time-sharing air water content H according to the algorithm 1, and clears the timing module after each calculation; calculating an accumulated air moisture M through the evaporator according to algorithm 2; after the second step is finished, the electric control device clears the calculation result;
algorithm 1 is: h=v×, t×s× (RH 1% -RH 2%) ×w×ρα;
v is the designed wind speed stored at the refrigerating air inlet in the electric control device;
t is the time-sharing length of refrigerating the refrigerating chamber when the time-sharing air water content H is calculated, and t is less than or equal to 5 seconds and less than or equal to 300 seconds;
in the second step, when the continuous calculation condition is met, the electric control device performs operation of calculating the H value once according to the algorithm 1, returns to the first step after calculation and performs operation of calculating the air water content in the next time sharing;
the continuous calculation conditions were: the time for opening the refrigeration door or singly timing reaches fatter; when the refrigeration door is opened, delaying for 5 seconds before returning to the first step;
in the second step, when the calculation suspension condition is met, the electric control device performs a job of calculating the H value once according to the algorithm 1, and suspends the second step after calculation; the suspension calculation condition is the inverse condition of the frosting basic condition, namely that the compressor is closed or the fan is closed or the refrigeration air door is closed; after the second step is suspended, when the basic frosting condition is met, resuming the second step;
s is the area of the refrigerating air inlet;
RH1% is the relative humidity of the air intake of the refrigerating chamber at the beginning of one time-sharing calculation;
RH2% is the relative humidity of the air intake of the refrigerating chamber at the end of one time sharing;
w is the water content of saturated humid air at the set temperature of the refrigerating chamber;
ρ is the dry air density at the refrigerator compartment set temperature;
alpha is a correction coefficient; when the ambient humidity measured by the outside-box humidity sensor is less than or equal to the refrigerating chamber humidity measured by the inside-box humidity sensor, α=1; when the ambient humidity is greater than the refrigerator compartment humidity, α= (ambient temperature/refrigerator compartment humidity) 0.5 ；
Algorithm 2 is: m=sum of the air moisture contents H for each time division.
The compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high Wen Jian compartment;
when the number of the high Wen Jian chambers is more than 1, calculating M values for each high temperature chamber according to the defrosting control method of the air-cooled refrigerator, and adding the M values calculated for the high temperature chambers to obtain M Total (S) When M Total (S) And (5) defrosting is started when the temperature is not less than X.
Development design description:
1. the freezing chamber temperature of the refrigerator is usually more than ten times lower than freezing temperature, so that the water content in the subzero low-temperature air of the freezing chamber is very little, and the frosting amount at the evaporator is not increased basically by the subzero low-temperature air circulation.
In the past, defrosting was controlled according to the accumulated operation time of the compressor, and the operation time of the compressor when the refrigerating chamber is not ventilated due to the fact that the temperature reaches the set temperature is also included, and the operation of the compressor in this time period does not actually increase the frosting quantity at the evaporator (the water content of circulating air below the freezing point is extremely low).
The cases where the refrigerating chamber is not ventilated and the freezing chamber is ventilated are not considered in the invention, and the invention does not need to take the consideration of defrosting control, so that ineffective defrosting is avoided.
2. The refrigerator refrigerating chambers all have a set temperature TS between 0 ℃ and 10 ℃. At a given set temperature of TS C, substantially the same frosting effect occurs when the same amount of air (temperature TS) with the same humidity flows through the evaporator (which is usually at a low temperature of-several tens of degrees below zero, such as-30℃, when the evaporator is in operation). If the water content of the refrigerating chamber of the refrigerator is calculated to control the defrosting of the refrigerator, the timely defrosting can be achieved, ineffective defrosting (defrosting is not needed when the frost amount on the evaporator has little influence on heat exchange) can be prevented, energy is saved, and fluctuation of the temperature of the refrigerating chamber is reduced. This is the principle preparation for designing the correlation algorithm in the present invention.
3. Considering that the household refrigerator does not have the sealing performance of the aerospace level, the environment air humidity is taken into consideration, and the correction coefficient is set so that the related algorithm is more suitable for the practical operation of the household refrigerator.
By adopting the technical scheme of the invention, the influence of freezing chamber refrigeration with small influence on the frosting of the evaporator is eliminated, and the increase of energy consumption caused by invalid defrosting is avoided. The invention reasonably arranges the judging conditions, the frosting basic conditions and the suspension calculating conditions, and timely starts the calculating process, so that a new round of calculation can be started timely according to the door opening condition of the refrigerating chamber, and the adverse effect on the calculating accuracy caused by the jumping change of the humidity after the door is opened is solved. In a word, the invention enables the defrosting process to be more matched with the actual frosting quantity of the evaporator, thereby giving consideration to the defrosting effect and the energy-saving aim.
The continuous calculation condition of the algorithm 1 considers factors of opening the refrigeration door 10 (the humidity in the refrigeration chamber after the refrigeration door 10 is opened is changed in a jumping way, so that re-time division calculation is needed, otherwise, the calculation result is inaccurate), and the door opening factor is considered outside time division, so that the calculation result is more accurate. The suspension calculation condition of the algorithm 1 avoids unnecessary calculation for frosting of the evaporator (the closing of the compressor 6 is a condition that the fan 7 is closed sufficiently and unnecessarily, the closing of the fan 7 is a condition that the refrigerating damper 9 is closed sufficiently and unnecessarily, and the air in the refrigerating chamber does not flow through the evaporator any more, so that the frosting amount is not increased any more, and the calculation is not needed under the condition), so that the calculation result is more in accordance with the actual running of the refrigerator.
Specifically, when the refrigeration door 10 is opened, the H value is calculated in real time without the time-sharing time length of the original plan; when the door sensor 11 monitors the moment that the refrigerating chamber is opened, the humidity of the refrigerating chamber is not obviously changed in a jumping way, and the humidity is calculated immediately, so that the calculated RH1% -RH2% value of the present round can be more accurately matched with the running state of the refrigerator);
then, after a delay of 5 seconds, the next calculation is started (when the next calculation is performed after one calculation, 5 seconds delay and condition judgment, because the air inside and outside the refrigerating chamber has a great amount of convection due to a short delay, the humidity change of the refrigerating door 10 for 5 seconds and the humidity change of the refrigerating door for longer time such as 10 seconds are not greatly different, so that the humidity after the door is opened, which is monitored by the humidity sensor 2 in the box, can be more accurately matched with the humidity change condition in the refrigerating chamber, and the RH1% -RH2% value in the new calculation can be more accurately matched with the running state of the refrigerator, so that the calculation result is more accurate.
Through the algorithm 1, the accumulated air moisture content M of the evaporator can be accurately calculated, the value of M is closely related to the frosting quantity of the evaporator, the defrosting function of the refrigerator can be timely started through the algorithm 2, the phenomenon of invalid defrosting is avoided (energy consumption is increased), and defrosting and energy saving are achieved.
Drawings
Fig. 1 is a schematic structural view of an air-cooled refrigerator according to the present invention;
FIG. 2 is a control flow diagram of the present invention;
fig. 3 is an electronically controlled schematic of the present invention.
Detailed Description
As shown in fig. 1 to 3, the invention provides a defrosting control method for an air-cooled refrigerator, which is used for the air-cooled refrigerator, wherein a refrigerating chamber and a freezing chamber are arranged in a refrigerator body 1 of the air-cooled refrigerator, a refrigerating system is arranged in the refrigerator body 1, the refrigerating system comprises a compressor 6, a condenser, a throttling device (such as a capillary tube or an expansion valve) and an evaporator which are circularly communicated through a refrigerant pipeline, and a defrosting device 5 (such as an electric heater) and a defrosting temperature sensor 13 are arranged at the evaporator; the refrigeration system is conventional and the condenser, the throttling device and the evaporator are not shown.
An air channel passing through the evaporator is arranged in the box body 1, a refrigeration air inlet and a refrigeration air return opening are arranged in the refrigeration chamber, the refrigeration air inlet is communicated with the air channel at the downstream of the evaporator by taking the direction of air flow as the downstream direction, and a refrigeration air door 9 for controlling the opening and closing of the refrigeration air inlet is arranged on the air channel at the refrigeration air inlet; the refrigerating return air inlet is communicated with an air channel at the upstream of the evaporator, and a fan 7 for driving air to circularly flow and flow through the evaporator is arranged in the air channel at the evaporator; a refrigerating temperature sensor 3 and an in-box humidity sensor 2 are arranged in the refrigerating chamber, and an out-box humidity sensor 4 is embedded in the outer wall of the box body 1; the refrigerator has a refrigerator door 10, the refrigerator door 10 having a door sensor 11; the air duct is a conventional technology of an air-cooled refrigerator, and the air duct, the refrigerating air inlet and the refrigerating air return are not shown in the figure.
An electric control device 8 (the electric control device 8 can adopt an integrated circuit or a singlechip and comprises a PLC), a defrosting temperature sensor 13, a compressor 6, a fan 7, a door sensor 11, a refrigeration air door 9, a defrosting device 5, an in-box humidity sensor 2, an out-box humidity sensor 4 and a refrigeration temperature sensor 3 are all connected with the electric control device 8, the electric control device 8 is preferably connected with a display screen 12,
the electric control device 8 stores the design wind speed v at the refrigerating air inlet in m/s, the v value is determined by the power supply capacity (rated power) of the fan 7 of a specific model, the air duct structure of the refrigerator of the specific model and the like, and the design of the refrigerator of the specific model is determined and verified through a prototype; the electric control device 8 is provided with a timing module; the cumulative air moisture content through the evaporator during operation of the refrigerator is referred to as M (in grams);
in the refrigerator design stage, after the refrigerator structure is determined, determining the value of the parameter X (the unit of X is gram) and the value of the parameter N through experiments; when M is more than or equal to X, defrosting is started; the meaning of N is: the operating time of the defrosting device 5, which ensures that the defrosting of the evaporator reaches the design effect when m=x, is in seconds;
the defrosting control is carried out in the refrigerator operation according to the following steps in sequence:
the first step is that in the continuous operation of the refrigerator, when judging that the condition is met, the electric control device 8 judges whether the frosting basic condition is met;
the judging condition is that the compressor 6 is started, or the fan 7 is started, or the refrigeration damper 9 is started;
the frosting basic condition is that the compressor 6 is started and the fan 7 is started and the refrigeration damper 9 is opened;
re-executing the first step when the frosting basic condition is not satisfied; performing a second step operation when the frosting basic conditions are met;
the second step is to calculate the air water content in a time-sharing way and accumulate the results of calculating the air water content in each time-sharing way, when the accumulated air water content M passing through the evaporator is more than or equal to X, the electric control device 8 controls the defrosting device 5 to defrost; stopping defrosting when the defrosting ending condition is met, and ending the second step; after the second step is completed, the electronic control device 8 returns to re-execute the first step. The defrost end conditions are: the temperature detected by the defrosting temperature sensor 13 after defrosting starts is 9 ℃ or higher, or the defrosting time is 40 minutes or longer.
By adopting the technical scheme of the invention, the influence of freezing chamber refrigeration with small influence on the frosting of the evaporator is eliminated, and the increase of energy consumption caused by invalid defrosting is avoided. The invention reasonably arranges the judging conditions, the frosting basic conditions and the suspension calculating conditions, and timely starts the calculating process, so that a new round of calculation can be started timely according to the door opening condition of the refrigerating chamber, and the adverse effect on the calculating accuracy caused by the jumping change of the humidity after the door is opened is solved. In a word, the invention enables the defrosting process to be more matched with the actual frosting quantity of the evaporator, thereby giving consideration to the defrosting effect and the energy-saving aim.
In the second step, the electronic control device 8 calculates the time-sharing air water content H (in grams) according to the algorithm 1, clears the timing module after each calculation (the calculation time is not accumulated, only the water content is accumulated, and each calculation according to the algorithm 1 is independently timed); calculating an accumulated air moisture M through the evaporator according to algorithm 2; after the second step is finished, the electric control device 8 clears the calculation result;
algorithm 1 is: h=v×, t×s× (RH 1% -RH 2%) ×w×ρα;
v is the designed wind speed stored in the electric control device 8 at the refrigerating air inlet, and the unit is meter/second;
t is the time-sharing length of refrigerating the refrigerating chamber when the time-sharing air water content H is calculated, and t is less than or equal to 5 seconds and less than or equal to 300 seconds;
in the second step, when the continuous calculation condition is satisfied, the electronic control device 8 performs an operation of calculating the H value once according to the algorithm 1, returns to the first step (when the judgment condition and the frosting basis condition are satisfied, and thus the continuous calculation) after the calculation (without clearing so as to calculate the M value in an accumulated manner) and performs an operation of calculating the air water content in the next time-sharing manner;
the continuous calculation conditions were: the time when the refrigeration door 10 is opened or counted for a single time reaches t; when the refrigeration door 10 is opened, it is delayed for 5 seconds before returning to the first step;
in the process of the second step, when the calculation suspension condition is satisfied, the electric control device 8 performs a job of calculating the H value once according to the algorithm 1, and suspends the second step after calculation; the suspension calculation condition is the opposite condition of the frosting base condition, namely that the compressor 6 is closed or the fan 7 is closed or the refrigeration damper 9 is closed;
after the second step is suspended, when the basic frosting condition is met, resuming the second step; continuing to calculate the air water content in a time-sharing mode (not completed before) and accumulating the result of calculating the air water content in each time-sharing mode; accumulating the H values for each time until M is more than or equal to X, controlling the defrosting device 5 to work for N seconds by the electric control device 8 to defrost, and returning to execute the first step after defrosting; the suspension corresponds to immediately calculating the H value once when the refrigerating chamber stops refrigerating, and returning to the first step without zero clearing.
S is the area of the refrigerating air inlet; the unit is square meters, and is a fixed value for a refrigerator of a specific model;
RH1% is the relative humidity of the air intake of the refrigerating chamber at the beginning of one time-sharing calculation; the relative humidity of the air inside the closed cabinet 1 is generally gradually reduced during normal operation of the refrigerator, because a portion of the water frosts at the evaporator during the operation of the refrigerator;
RH2% is the relative humidity of the air intake of the refrigerating chamber at the end of one time sharing; the electric control device 8 obtains the values of RH1% and RH2% by the humidity sensor 2 in the box; relative humidity is the ratio of dimensionless (no units);
w is the water content of saturated humid air at the set temperature of the refrigerating chamber (the refrigerator user determines the set temperature of the refrigerating chamber through a knob or a button; the electric control device 8 obtains the W value by a table look-up method, which is a conventional technology and is not repeated), and the unit is gram/kg;
ρ is the dry air density (W value obtained by the electric control device 8 by a table look-up method) at the set temperature of the refrigerating chamber, and the unit is kg/cubic meter;
alpha is a correction coefficient; alpha is a dimensionless (unit) value; when the ambient humidity measured by the outside-box humidity sensor 4 is equal to or less than the refrigerating chamber humidity measured by the inside-box humidity sensor 2, α=1; when the ambient humidity is greater than the refrigerator compartment humidity, α= (ambient temperature/refrigerator compartment humidity) 0.5 ；
The necessity of the existence of the correction coefficient is that: the common refrigerator does not have the sealing performance of the aerospace level, the frosting quantity of an evaporator in the refrigerator working is increased when the ambient humidity is higher, and the larger the humidity difference is, the larger the influence is (if the necessity of the existence of the correction coefficient is not explained here, the person skilled in the art cannot guess why the correction coefficient exists, and certainly does not know how to take the value, so that the understanding of the invention is hindered).
Algorithm 2 is: m=sum of the air moisture contents H for each time division.
The continuous calculation condition of the algorithm 1 considers factors of opening the refrigeration door 10 (the humidity in the refrigeration chamber after the refrigeration door 10 is opened is changed in a jumping way, so that re-time division calculation is needed, otherwise, the calculation result is inaccurate), and the door opening factor is considered outside time division, so that the calculation result is more accurate. The suspension calculation condition of the algorithm 1 avoids unnecessary calculation for frosting of the evaporator (the closing of the compressor 6 is a condition that the fan 7 is closed sufficiently and unnecessarily, the closing of the fan 7 is a condition that the refrigerating damper 9 is closed sufficiently and unnecessarily, and the air in the refrigerating chamber does not flow through the evaporator any more, so that the frosting amount is not increased any more, and the calculation is not needed under the condition), so that the calculation result is more in accordance with the actual running of the refrigerator.
Specifically, when the refrigeration door 10 is opened, the H value is calculated in real time without the time-sharing time length of the original plan; when the door sensor 11 monitors the moment that the refrigerating chamber is opened, the humidity of the refrigerating chamber is not obviously changed in a jumping way, and the humidity is calculated immediately, so that the calculated RH1% -RH2% value of the present round can be more accurately matched with the running state of the refrigerator);
then, after a delay of 5 seconds, the next calculation is started (when the next calculation is performed after one calculation, 5 seconds delay and condition judgment, because a great amount of convection is performed on air inside and outside the refrigerating chamber due to a short delay, the humidity change of the refrigerating door 10 after 5 seconds and 10 seconds are opened is not greatly different, so that the humidity after the door is opened, which is monitored by the humidity sensor 2 in the refrigerator, can be more accurately matched with the humidity change condition in the refrigerating chamber, and the RH1% -RH2% value in the new calculation can be more accurately matched with the running state of the refrigerator, so that the calculation result is more accurate.
Through the algorithm 1, the accumulated air moisture content M of the evaporator can be accurately calculated, the value of M is closely related to the frosting quantity of the evaporator, the defrosting function of the refrigerator can be timely started through the algorithm 2, the phenomenon of invalid defrosting is avoided (energy consumption is increased), and defrosting and energy saving are achieved.
The compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high Wen Jian compartment;
when the number of chambers of height Wen Jian is greater than 1, thenEach high temperature chamber calculates M value according to the defrosting control method of the air-cooled refrigerator, and adds the M values calculated for each high temperature chamber to obtain M Total (S) When M Total (S) And (3) starting defrosting when the temperature is not less than X, and resetting the calculation result after defrosting.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (2)
1. A defrosting control method of an air-cooled refrigerator is used for the air-cooled refrigerator, a refrigerating chamber and a freezing chamber are arranged in the refrigerator body of the air-cooled refrigerator, a refrigerating system is arranged in the refrigerator body, the refrigerating system comprises a compressor, a condenser, a throttling device and an evaporator which are circularly communicated through a refrigerant pipeline, and a defrosting device and a defrosting temperature sensor are arranged at the evaporator; the refrigerator is characterized in that an air channel passing through the evaporator is arranged in the refrigerator, a refrigeration air inlet and a refrigeration air return opening are arranged in the refrigeration chamber, the direction of air flow is taken as the downstream direction, the refrigeration air inlet is communicated with the air channel at the downstream of the evaporator, and a refrigeration air door for controlling the switch of the refrigeration air inlet is arranged on the air channel at the refrigeration air inlet; the refrigerating return air inlet is communicated with an air channel at the upstream of the evaporator, and a fan for driving air to circularly flow and flow through the evaporator is arranged in the air channel; a refrigerating temperature sensor and an in-box humidity sensor are arranged in the refrigerating chamber, and an out-box humidity sensor is arranged outside the box body; the refrigerating chamber has a refrigerating door having a door sensor;
still be equipped with electrically controlled device in the box, defrosting temperature sensor, compressor, fan, door sensor, cold-stored air door, defroster, in-box humidity transducer, outside box humidity transducer and cold-stored temperature sensor all are connected with electrically controlled device, its characterized in that:
the electric control device stores a design wind speed v at the refrigerating air inlet and is provided with a timing module; the accumulated air moisture content passing through the evaporator during the operation of the refrigerator is called M;
in the refrigerator design stage, after the refrigerator structure is determined, determining the value of the parameter X and the value of the parameter N through experiments; when M is more than or equal to X, defrosting is started; the meaning of N is: when m=x, the defrosting device working time for ensuring that the defrosting of the evaporator achieves the design effect;
the defrosting control is carried out in the refrigerator operation according to the following steps in sequence:
the first step is that in the continuous operation of the refrigerator, when judging that the condition is met, the electric control device judges whether the frosting basic condition is met;
judging whether the condition is that the compressor is started or the fan is started or the refrigeration air door is started;
the frosting basic condition is that the compressor is started, the fan is started and the refrigeration air door is opened;
re-executing the first step when the frosting basic condition is not satisfied; performing a second step operation when the frosting basic conditions are met;
the second step is to calculate the air water content in a time-sharing way and accumulate the results of calculating the air water content in each time-sharing way, and when the accumulated air water content M passing through the evaporator is more than or equal to X, the electric control device controls the defrosting device to defrost; the second step is finished when defrosting is finished; after the second step is finished, the electric control device returns to execute the first step again;
in the second step, the electric control device calculates the time-sharing air water content H according to the algorithm 1, and clears the timing module after each calculation; calculating an accumulated air moisture M through the evaporator according to algorithm 2; after the second step is finished, the electric control device clears the calculation result;
algorithm 1 is: h=v×, t×s× (RH 1% -RH 2%) ×w×ρα;
v is the designed wind speed stored at the refrigerating air inlet in the electric control device;
t is the time-sharing length of refrigerating the refrigerating chamber when the time-sharing air water content H is calculated, and t is less than or equal to 5 seconds and less than or equal to 300 seconds;
in the second step, when the continuous calculation condition is met, the electric control device performs operation of calculating the H value once according to the algorithm 1, returns to the first step after calculation and performs operation of calculating the air water content in the next time sharing;
the continuous calculation conditions were: the time for opening the refrigeration door or singly timing reaches fatter; when the refrigeration door is opened, delaying for 5 seconds before returning to the first step;
in the second step, when the calculation suspension condition is met, the electric control device performs a job of calculating the H value once according to the algorithm 1, and suspends the second step after calculation; the suspension calculation condition is the inverse condition of the frosting basic condition, namely that the compressor is closed or the fan is closed or the refrigeration air door is closed; after the second step is suspended, when the basic frosting condition is met, resuming the second step;
s is the area of the refrigerating air inlet;
RH1% is the relative humidity of the air intake of the refrigerating chamber at the beginning of one time-sharing calculation;
RH2% is the relative humidity of the air intake of the refrigerating chamber at the end of one time sharing;
w is the water content of saturated humid air at the set temperature of the refrigerating chamber;
ρ is the dry air density at the refrigerator compartment set temperature;
alpha is a correction coefficient; when the ambient humidity measured by the outside-box humidity sensor is less than or equal to the refrigerating chamber humidity measured by the inside-box humidity sensor, α=1; when the ambient humidity is greater than the refrigerator compartment humidity, α= (ambient temperature/refrigerator compartment humidity) 0.5 ；
Algorithm 2 is: m=sum of the air moisture contents H for each time division.
2. The defrosting control method for an air-cooled refrigerator according to claim 1, wherein: the compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high Wen Jian compartment;
when the number of high Wen Jian chambers is greater than 1, calculating M value for each high temperature chamber according to a defrosting control method of an air-cooled refrigerator as set forth in claim 1, and adding the calculated M values for each high temperature chamber to obtain M Total (S) When M Total (S) And (5) defrosting is started when the temperature is not less than X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210572602.9A CN114992972B (en) | 2022-05-25 | 2022-05-25 | Defrosting control method for air-cooled refrigerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210572602.9A CN114992972B (en) | 2022-05-25 | 2022-05-25 | Defrosting control method for air-cooled refrigerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114992972A CN114992972A (en) | 2022-09-02 |
| CN114992972B true CN114992972B (en) | 2024-04-05 |
Family
ID=83029439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210572602.9A Active CN114992972B (en) | 2022-05-25 | 2022-05-25 | Defrosting control method for air-cooled refrigerator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114992972B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202221212U (en) * | 2011-08-31 | 2012-05-16 | 杭州华日电冰箱股份有限公司 | Intelligent defrosting computer refrigerator control system |
| CN106885429A (en) * | 2017-03-17 | 2017-06-23 | 海信容声(广东)冰箱有限公司 | A kind of refrigerator defrosting control method and device, refrigerator |
| CN109798713A (en) * | 2019-02-18 | 2019-05-24 | 河南新飞制冷器具有限公司 | Three-circulation wind cold refrigerator and its defrosting method |
| CN113587539A (en) * | 2021-07-30 | 2021-11-02 | 松下电器研究开发(苏州)有限公司 | Defrosting control method and refrigerator |
| CN113915919A (en) * | 2021-03-31 | 2022-01-11 | 海信（山东）冰箱有限公司 | Refrigerator and refrigerator defrosting control method |
| CN113932560A (en) * | 2021-11-18 | 2022-01-14 | 河南新飞制冷器具有限公司 | Defrosting method of series-parallel double-system air-cooled refrigerator |
-
2022
- 2022-05-25 CN CN202210572602.9A patent/CN114992972B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202221212U (en) * | 2011-08-31 | 2012-05-16 | 杭州华日电冰箱股份有限公司 | Intelligent defrosting computer refrigerator control system |
| CN106885429A (en) * | 2017-03-17 | 2017-06-23 | 海信容声(广东)冰箱有限公司 | A kind of refrigerator defrosting control method and device, refrigerator |
| CN109798713A (en) * | 2019-02-18 | 2019-05-24 | 河南新飞制冷器具有限公司 | Three-circulation wind cold refrigerator and its defrosting method |
| CN113915919A (en) * | 2021-03-31 | 2022-01-11 | 海信（山东）冰箱有限公司 | Refrigerator and refrigerator defrosting control method |
| CN113587539A (en) * | 2021-07-30 | 2021-11-02 | 松下电器研究开发(苏州)有限公司 | Defrosting control method and refrigerator |
| CN113932560A (en) * | 2021-11-18 | 2022-01-14 | 河南新飞制冷器具有限公司 | Defrosting method of series-parallel double-system air-cooled refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114992972A (en) | 2022-09-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108613473B (en) | Wind cooling refrigerator and its control method of defrost, control system, controller | |
| JP3636602B2 (en) | refrigerator | |
| CN104807113B (en) | A kind of air conditioner outdoor machine defrosting decision method | |
| CN102679685B (en) | Air-cooled refrigerator and energy-saving defrosting control method thereof | |
| CN107940873B (en) | Defrosting method, defrosting system, computer readable storage medium and refrigeration equipment | |
| Qiao et al. | Transient modeling of a flash tank vapor injection heat pump system–Part II: Simulation results and experimental validation | |
| WO2006095571A1 (en) | Refrigerator | |
| CN101451779A (en) | Defrosting control method for heat pump air conditioner | |
| CN108469098A (en) | Defrosting control method, device, air conditioner and computer readable storage medium | |
| CN109253524B (en) | Control method of heat pump system, heat pump system and air conditioner | |
| CN108885050A (en) | Refrigerator | |
| CN104879941B (en) | Cooling cycle system of refrigerator, condensation prevention control method and refrigerator | |
| JP5110192B1 (en) | Refrigeration equipment | |
| WO2005038365A1 (en) | Cooling storage | |
| CN111811198A (en) | Defrosting control method and device and electric equipment | |
| CN110779260A (en) | Three-circulation quick-cooling frost-free refrigerator and continuous operation method thereof | |
| CN107289576B (en) | Defrosting control method for air conditioner | |
| CN108800416A (en) | air conditioner defrosting control method | |
| CN202613892U (en) | Air-cooled refrigerator | |
| JPH0894234A (en) | Defrosting device for refrigerator | |
| CN114992972B (en) | Defrosting control method for air-cooled refrigerator | |
| CN205425590U (en) | White refrigerating system of multicycle forced air cooling refrigeratorization | |
| JP2000274916A (en) | Cooling storage chamber | |
| JPH08226715A (en) | Heat pump type air conditioning equipment | |
| JP3497255B2 (en) | Refrigeration equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |