CN114992972A - Defrosting control method for air-cooled refrigerator - Google Patents
Defrosting control method for air-cooled refrigerator Download PDFInfo
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- CN114992972A CN114992972A CN202210572602.9A CN202210572602A CN114992972A CN 114992972 A CN114992972 A CN 114992972A CN 202210572602 A CN202210572602 A CN 202210572602A CN 114992972 A CN114992972 A CN 114992972A
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- 238000010257 thawing Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005057 refrigeration Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims description 66
- 238000004422 calculation algorithm Methods 0.000 claims description 30
- 230000008014 freezing Effects 0.000 claims description 11
- 238000007710 freezing Methods 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 4
- 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
- 238000012360 testing method Methods 0.000 claims description 2
- 239000003570 air Substances 0.000 description 92
- 238000005265 energy consumption Methods 0.000 description 4
- 230000009191 jumping Effects 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 1
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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
- F25D21/002—Defroster control
- F25D21/008—Defroster control by timer
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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
- F25D2600/00—Control issues
- F25D2600/02—Timing
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses a defrosting control method for an air-cooled refrigerator, which is characterized in that the defrosting control is sequentially carried out according to the following steps in the running process of the refrigerator: the first step is that in the continuous operation of the refrigerator, when the judgment condition is satisfied, the electric control device judges whether the frosting basic condition is satisfied; the judgment condition is when the compressor is started, or when the fan is started, or when the refrigeration air door is started; the basic condition of frosting is that the compressor is started, the fan is started and the refrigerating air door is opened; performing the second step operation when the frosting base condition is met; the second step is to calculate the air water content in different time and to accumulate the results of calculating the air water content in different time, when the accumulated air water content M of the evaporator is not less than X, the electric control device controls the defrosting device to defrost, and then the first step is executed again. The invention innovatively discloses a technical route for defrosting of the air-cooled refrigerator, so that the defrosting process of the air-cooled refrigerator is more matched with the actual frosting amount of the evaporator, and the defrosting effect and the energy-saving target are both considered.
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
Air-cooled refrigerators have become the mainstream as the demand for refrigerators in the consumer market has continuously changed. The defrosting of the existing air-cooled refrigerator is mainly determined when to start defrosting by calculating the refrigerating accumulated time of a compressor.
When the environmental humidity and the humidity in the refrigerator are low, the frosting amount on the evaporator of the refrigerator is small, the refrigerating efficiency of the refrigerator is not influenced, if the defrosting is started when the refrigerating accumulated time of the press reaches the preset time, ineffective defrosting (the necessity of defrosting is not needed), the power consumption is increased meaninglessly, and meanwhile, the temperature of the compartment is increased, and the refrigerating effect is influenced.
On one hand, under the path dependence developed by the prior art, a technical route for performing defrosting control on the air-cooled refrigerator according to the accumulated running time of the compressor cannot be skipped by a person skilled in the art;
on the other hand, the method departs from the existing technical route, considers the reasonable factor of frosting of the refrigerator evaporator again, and also needs creative work for designing a reasonable water content calculation algorithm and a defrosting control method.
Therefore, although the refrigerator has a history of hundreds of years and the air-cooled refrigerator has a history of decades, a defrosting control method of the air-cooled refrigerator for performing 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 for an air-cooled refrigerator, which changes the technical route of controlling defrosting by the accumulated running time of a compressor in the prior art, and carries out defrosting control on the basis of accumulating the effective air moisture content passing through an evaporator (the air from a freezing chamber to the evaporator is the ineffective air moisture content), so that the defrosting is more matched with the frosting amount of the evaporator, and the phenomenon of ineffective defrosting is avoided.
In order to achieve the 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 a box body of the air-cooled refrigerator, a refrigerating system is arranged in the box 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; an air duct passing through the evaporator is arranged in the box body, a refrigerating air inlet and a refrigerating air return inlet are arranged in the refrigerating chamber, the direction of air flow is the downstream direction, the refrigerating air inlet is communicated with the air duct at the downstream of the evaporator, and a refrigerating air door for controlling the opening and closing of the refrigerating air inlet is arranged on the air duct at the refrigerating air inlet; the refrigerating air return port is communicated with an air duct 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 duct; 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 is provided with a refrigerating door, and the refrigerating door is provided with a door sensor;
an electric control device is also arranged in the box body, and a defrosting temperature sensor, a compressor, a fan, a door sensor, a refrigeration air door, a defrosting device, an in-box humidity sensor, an out-box humidity sensor and a refrigeration temperature sensor are all connected with the electric control device;
the design wind speed v at the refrigerating air inlet is stored in the electric control device, and the electric control device is provided with a timing module; the accumulated air water content passing through the evaporator during the operation of the refrigerator is called M;
in the stage of designing the refrigerator, after the structure of the refrigerator is determined, determining the value of the parameter X and the value of the parameter N through tests; when M is larger than or equal to X, defrosting is started; the meaning of N is: when M is X, the working time of the defrosting device for ensuring that the defrosting of the evaporator achieves the design effect is ensured;
the defrosting control is sequentially carried out according to the following steps during the operation of the refrigerator:
the first step is that in the continuous operation of the refrigerator, when the judgment condition is satisfied, the electric control device judges whether the frosting basic condition is satisfied;
the judgment condition is that the compressor is started, or the fan is started, or the refrigerating air door is started;
the basic condition of frosting is that the compressor is started, the fan is started and the refrigerating air door is opened;
re-executing the first step when the frosting base condition is not met; performing a second step operation when the frosting basic condition is met;
the second step is to calculate the air water content in different time and accumulate the results of calculating the air water content in different time, when the accumulated air water content M of the evaporator is not less than 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 the timing module is cleared after each calculation; calculating the cumulative air moisture content M through the evaporator according to algorithm 2; after the second step is finished, the electric control device clears the calculation result;
the algorithm 1 is: h = v Δ tx S × (RH 1% -RH 2%) xW × ρ × α;
v is the designed wind speed at the refrigerating air inlet stored in the electric control device;
the Δ t is the time sharing length for refrigerating the refrigerating chamber when the water content H of the time sharing air is calculated, and the t is less than or equal to 300 seconds within 5 seconds;
during the second step, when the continuous calculation condition is met, the electric control device performs the operation of calculating the H value once according to the algorithm 1, and returns to the first step after calculation and performs the operation of calculating the water content of the air at the next time;
the continuous calculation conditions were: the time of opening the refrigerating door or timing once reaches t; delaying for 5 seconds before returning to the first step when the refrigerating door is opened;
in the process of the second step, when the pause calculation condition is met, the electric control device performs the operation of calculating the H value once according to the algorithm 1, and pauses the second step after the calculation; the pause calculation condition is the inverse condition of the frosting base condition, namely the compressor is closed or the fan is closed or the refrigerating air door is closed; after the second step is suspended, when the frosting basic condition is met, the second step is resumed;
s is the area of the refrigerating air inlet;
RH1% is the relative humidity of the inlet air of the refrigerating chamber when the time-sharing calculation is started;
RH2% is the relative humidity of the inlet air of the refrigerating chamber when the time sharing is finished;
w is the moisture content of the saturated humid air at the set temperature of the refrigerating chamber;
rho is dry air density at the set temperature of the refrigerating chamber;
α is a correction coefficient; when the environment humidity measured by the humidity sensor outside the box is less thanWhen the humidity of the refrigerating chamber is equal to that measured by the humidity sensor in the refrigerating chamber, alpha is 1; when the ambient humidity is greater than the refrigerator compartment humidity, α ═ is (ambient temperature/refrigerator compartment humidity) 0.5 ；
The algorithm 2 is: m = the sum of the air water contents H for each time division.
A compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high-temperature compartment;
when the number of the high-temperature chambers is more than 1, calculating the M value of each high-temperature chamber according to the air-cooled refrigerator defrosting control method in claim 1 or 2, and adding the M values calculated for the high-temperature chambers to obtain M General assembly When M is General assembly And starting defrosting when the temperature is more than or equal to X.
Research and development design description:
1. the freezer compartment temperature of a refrigerator is typically minus a few tenths of a degree below freezing, so that the freezing compartment has very little water content in the minus low temperature air, and this minus low temperature air circulation does not substantially increase the amount of frost formation at the evaporator.
In the past, defrosting is controlled according to the accumulated running time of the compressor, and actually, the running time of the compressor when the refrigerating chamber does not ventilate because the temperature reaches the set temperature and the freezing chamber ventilates is included, and the running of the period of time does not actually increase the frosting amount at the evaporator (the water content of circulating air below the freezing point is extremely low).
The invention completely does not take the consideration of defrosting control under the condition that the refrigerating chamber is not ventilated and the freezing chamber is ventilated, thereby avoiding ineffective defrosting.
2. The refrigerator compartments all have a set temperature TS, which is between 0 ℃ and 10 ℃. At a specific set temperature TS deg.c, the same amount of air (temperature TS) with the same humidity flows through the evaporator (the evaporator is usually in a low temperature state of minus tens of degrees, such as minus 30 deg.c, when operating), the same frosting effect is basically produced. If the defrosting of the refrigerator is controlled by calculating the water content of the refrigerating chamber of the refrigerator, the timely defrosting can be realized, the ineffective defrosting (the defrosting is not needed when the heat exchange effect of the frost quantity on the evaporator is not large) can be prevented, the energy is saved, and the temperature fluctuation of the compartment is reduced. This is a principle preparation for designing the relevant algorithms of the present invention.
3. Considering that the household refrigerator does not have the sealing performance of the aerospace grade, the ambient air humidity is taken into consideration, and the correction coefficient is set to enable the relevant algorithm to be more consistent with the actual operation of the household refrigerator.
By adopting the technical scheme of the invention, the influence on the refrigeration of the freezing chamber which has little influence on the frosting of the evaporator is eliminated, and the increase of energy consumption caused by ineffective defrosting is avoided. The invention reasonably arranges the judgment condition, the frosting basic condition and the pause calculation condition, starts the calculation process in time, can start a new calculation in time according to the door opening condition of the refrigerating chamber, and solves the adverse effect of the jumping change of the humidity after the door is opened on the calculation accuracy. In a word, the defrosting method and the defrosting device enable the defrosting process to be more matched with the actual frosting amount of the evaporator, so that the defrosting effect and the energy-saving target are considered.
The continuous calculation condition of the algorithm 1 takes into account factors of the opening factor of the refrigeration door 10 (after the refrigeration door 10 is opened, the humidity in the refrigeration chamber usually changes in a jumping manner, so that time-sharing calculation needs to be carried out again, otherwise, the calculation result is inaccurate), and takes into account the door opening factor in addition to time-sharing, so that the calculation result is more accurate. The pause calculation condition of the algorithm 1 avoids meaningless calculation for evaporator frosting (the condition that the compressor 6 is closed is sufficient and unnecessary for the fan 7 to be closed, the condition that the fan 7 is closed is sufficient and unnecessary for the refrigerating air door 9 to be closed, air in a refrigerating chamber does not flow through the evaporator any more, the frosting amount is not increased any more, and therefore calculation is not needed in the condition), and the calculation result is more in line with the reality of refrigerator operation.
Specifically, when the refrigeration door 10 is opened, the H value is calculated in real time without the time-sharing duration of the original plan; when the door sensor 11 monitors that the refrigerating chamber is opened, the humidity of the refrigerating chamber is not changed suddenly and is calculated immediately, so that the calculated RH1% -RH2% can be more accurately matched with the running state of the refrigerator);
and then, starting the next round of calculation after delaying for 5 seconds (when the next round of calculation is carried out after one round of calculation, 5 second delay and condition judgment, because a short delay exists, air inside and outside the refrigerating chamber has excessive convection, and the humidity change of the refrigerating door 10 which is opened for 5 seconds and is opened for a longer time such as 10 seconds has no great difference, so that the humidity monitored by the humidity sensor 2 in the refrigerator after the door is opened can be more accurately matched with the humidity change condition in the refrigerating chamber, and the value of RH1% -RH2% in the new round of calculation can be more accurately matched with the running state of the refrigerator, so that the calculation result is more accurate.
By the algorithm 1, the accumulated air water content M passing through the evaporator can be accurately calculated, the value of M is closely related to the frosting amount of the evaporator, the defrosting function of the refrigerator can be started in time by the algorithm 2, the phenomenon of ineffective defrosting (energy consumption increase) is avoided, and defrosting and energy saving are both considered.
Drawings
FIG. 1 is a schematic structural view of an air-cooled refrigerator to which the present invention is directed;
FIG. 2 is a control flow diagram of the present invention;
fig. 3 is an electrical control schematic of the present invention.
Detailed Description
As shown in fig. 1 to 3, the present 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 box body 1 of the air-cooled refrigerator, a refrigerating system is arranged in the box 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 does not show the condenser, throttling device and evaporator.
An air duct passing through the evaporator is arranged in the box body 1, a refrigerating air inlet and a refrigerating air return inlet are arranged in the refrigerating chamber, the direction of air flow is the downstream direction, the refrigerating air inlet is communicated with the air duct at the downstream of the evaporator, and a refrigerating air door 9 used for controlling the opening and closing of the refrigerating air inlet is arranged on the air duct at the refrigerating air inlet; the refrigerating return air inlet is communicated with an air duct 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 duct 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 refrigerating chamber has a refrigerating door 10, the refrigerating door 10 having a door sensor 11; the air duct is conventional in the air-cooled refrigerator, and the air duct, the refrigerating air inlet and the refrigerating air return inlet are not shown in the figure.
The box body 1 is also internally provided with 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 design wind speed v at the refrigerating air inlet is stored in the electric control device 8, the unit is meter/second, the value of v is determined by the air supply capacity (rated power) of the fan 7 with a specific model, the air duct structure of the refrigerator with a specific model and the like, the value is determined when the refrigerator with a specific model is designed, and the verification is passed through a prototype; the electronic control device 8 has a timing module; the cumulative air moisture content passing through the evaporator during refrigerator operation is referred to as M (in grams);
in the stage of designing the refrigerator, after the structure of the refrigerator 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 larger than or equal to X, defrosting is started; the meaning of N is: when M is X, the working time of the defrosting device 5 for ensuring that the defrosting of the evaporator achieves the design effect is second;
the defrosting control is sequentially carried out according to the following steps in the running process of the refrigerator:
the first step is that in the continuous operation of the refrigerator, when the judgment condition is satisfied, the electric control device 8 judges whether the frosting basic condition is satisfied;
the judgment condition is that when the compressor 6 is started, or the fan 7 is started, or the refrigerating air door 9 is started;
the frosting base condition is that the compressor 6 is started, the fan 7 is started and the refrigerating air door 9 is opened;
re-executing the first step when the frosting base condition is not met; performing a second step operation when the frosting basic condition is met;
the second step is that the air water content is calculated in a time-sharing manner, the results of the air water content calculation in each time-sharing manner are accumulated, and when the accumulated air water content M passing through the evaporator is larger 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 finished, the electronic control device 8 returns to execute the first step again. The defrosting end conditions are as follows: the temperature detected by the defrosting temperature sensor 13 after defrosting is started is greater than or equal to 9 ℃, or the defrosting time is greater than or equal to 40 minutes.
By adopting the technical scheme of the invention, the influence on the refrigeration of the freezing chamber which has little influence on the frosting of the evaporator is eliminated, and the increase of energy consumption caused by ineffective defrosting is avoided. The invention reasonably arranges the judgment condition, the frosting basic condition and the pause calculation condition, starts the calculation process in time, can start a new round of calculation in time according to the door opening condition of the refrigerating chamber, and solves the adverse effect of the jump change of the humidity after the door is opened on the calculation accuracy. In a word, the defrosting method and the defrosting device enable the defrosting process to be more matched with the actual frosting amount of the evaporator, so that the defrosting effect and the energy-saving target are considered.
In the second step, the electric control device 8 calculates the time-sharing air water content H (unit is gram) according to the algorithm 1, and the timing module is cleared after each calculation (the calculation time is not accumulated, only the water content is calculated in an accumulated way; the calculation according to the algorithm 1 is timed independently every time); calculating the cumulative air moisture content M through the evaporator according to algorithm 2; after the second step is finished, the electric control device 8 clears the calculation result;
the algorithm 1 is: h = v Δ tx S × (RH 1% -RH 2%) xW × ρ × α;
v is the designed wind speed stored at the refrigerating air inlet in the electric control device 8, and the unit is meter/second;
the Δ t is the time sharing length for refrigerating the refrigerating chamber when the water content H of the time sharing air is calculated, and the t is less than or equal to 300 seconds within 5 seconds;
in the second step, when the continuous calculation condition is satisfied, the electric control device 8 performs the operation of calculating the H value once according to the algorithm 1, and returns to the first step (at this time, the judgment condition and the frosting base condition are both satisfied, so that the calculation is continuously performed) after the calculation (the zero clearing is not performed so as to calculate the M value accumulatively) and performs the operation of calculating the air water content at the next time;
the continuous calculation conditions were: the time for opening the cold storage door 10 or counting the time for one time reaches Δ t; the time delay of 5 seconds before returning to the first step when the refrigeration door 10 is opened;
during the second step, when the pause calculation condition is satisfied, the electric control device 8 performs the operation of calculating the H value once according to the algorithm 1, and pauses the second step after the calculation; the pause calculation condition is the inverse of the frosting base condition, i.e. the compressor 6 is closed or the fan 7 is closed or the refrigerating damper 9 is closed;
after the second step is suspended, when the frosting basic condition is met, the second step is resumed; continuing to calculate the air water content in different time (which is not finished before) and accumulating the results of calculating the air water content in different time; accumulating the H values of all times 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 pause corresponds to immediately calculating the H value once when the refrigeration of the refrigerating room is stopped, and returning to execute the first step without clearing.
S is the area of the refrigerating air inlet; the unit is square meter, which is a fixed value for a refrigerator of a specific model;
RH1% is the relative humidity of the inlet air of the refrigerating chamber when the time-sharing calculation is started; during normal operation of the refrigerator, the relative humidity of the air inside the enclosure 1 is generally gradually reduced, because a portion of the water is frosted at the evaporator during operation of the refrigerator;
RH2% is the relative humidity of the inlet air of the refrigerating chamber when the time sharing is finished; the electric control device 8 obtains RH1% and RH2% values through the humidity sensor 2 in the box; relative humidity is a dimensionless (unitless) ratio;
w is the water content of the saturated humid air at the set temperature of the refrigerating chamber (the set temperature of the refrigerating chamber is determined by a user of the refrigerator through a knob or a button; the electric control device 8 obtains the value W by a table look-up method, the table look-up method is a conventional technology and is not repeated), and the unit is gram/kilogram;
rho is dry air density (the electric control device 8 obtains a W value by a table look-up method) at the set temperature of the refrigerating chamber, and the unit is kilogram/cubic meter;
α is a correction coefficient; α is a dimensionless (unit) value; humidity transfer outside the boxWhen the environment humidity measured by the sensor 4 is less than or equal to the refrigerating chamber humidity measured by the in-box humidity sensor 2, alpha is 1; when the ambient humidity is greater than the refrigerator compartment humidity, α ═ is (ambient temperature/refrigerator compartment humidity) 0.5 ；
The necessity of the existence of the correction coefficient lies in that: the ordinary refrigerator does not have the sealing performance of the aerospace grade, the frost formation amount of an evaporator in the operation of the refrigerator can be 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, a person skilled in the art cannot guess why the correction coefficient exists, and certainly does not know how to take the value, which forms an obstacle to understanding the invention).
The algorithm 2 is: m = the sum of the air water contents H for each time division.
The continuous calculation condition of the algorithm 1 takes into account factors of the opening factor of the refrigeration door 10 (after the refrigeration door 10 is opened, the humidity in the refrigeration chamber usually changes in a jumping manner, so that time-sharing calculation needs to be carried out again, otherwise, the calculation result is inaccurate), and takes into account the door opening factor in addition to time-sharing, so that the calculation result is more accurate. The pause calculation condition of the algorithm 1 avoids meaningless calculation for evaporator frosting (the condition that the compressor 6 is closed is sufficient and unnecessary for the fan 7 to be closed, the condition that the fan 7 is closed is sufficient and unnecessary for the refrigerating air door 9 to be closed, air in a refrigerating chamber does not flow through the evaporator any more, the frosting amount is not increased any more, and therefore calculation is not needed in the condition), and the calculation result is more consistent with the actual operation of the refrigerator.
Specifically, when the refrigeration door 10 is opened, the H value is calculated in real time without the time-sharing duration of the original plan; when the door sensor 11 monitors that the refrigerating chamber is opened, the humidity of the refrigerating chamber is not changed suddenly and is calculated immediately, so that the calculated RH1% -RH2% can be more accurately matched with the running state of the refrigerator);
and then, the next round of calculation is started after the delay of 5 seconds (when the next round of calculation is carried out after the first round of calculation, the 5 second delay and the condition judgment, because a short delay exists, the air inside and outside the refrigerating chamber has excessive convection, and the humidity change of the refrigerating door 10 opening for 5 seconds and the humidity change of the refrigerating door 10 opening for 10 seconds have no great difference, the humidity monitored by the humidity sensor 2 in the refrigerating chamber after the door is opened can be more accurately matched with the humidity change condition in the refrigerating chamber, and the RH 1-RH 2% value in the new round of calculation can be more accurately matched with the running state of the refrigerator, so that the calculation result is more accurate.
By the algorithm 1, the accumulated air water content M passing through the evaporator can be accurately calculated, the value of M is closely related to the frosting amount of the evaporator, the defrosting function of the refrigerator can be started in time by the algorithm 2, the phenomenon of ineffective defrosting (energy consumption increase) is avoided, and defrosting and energy saving are both considered.
A compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high-temperature compartment;
when the number of the high-temperature chambers is more than 1, calculating the M value of each high-temperature chamber according to the defrosting control method of the air-cooled refrigerator in claim 1 or 2, and adding the M values calculated for the high-temperature chambers to obtain M General assembly When M is General (1) And starting defrosting when the defrosting is more than or equal to X, and resetting the calculation result after defrosting.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (3)
1. A defrosting control method of an air-cooled refrigerator is used for the air-cooled refrigerator, wherein a refrigerating chamber and a freezing chamber are arranged in a box body of the air-cooled refrigerator, a refrigerating system is arranged in the box 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; an air duct passing through the evaporator is arranged in the box body, a refrigerating air inlet and a refrigerating air return inlet are arranged in the refrigerating chamber, the direction of air flow is the downstream direction, the refrigerating air inlet is communicated with the air duct at the downstream of the evaporator, and a refrigerating air door used for controlling the opening and closing of the refrigerating air inlet is arranged on the air duct at the refrigerating air inlet; the refrigerating air return port is communicated with an air duct 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 duct; 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, incasement humidity transducer, the case outside humidity transducer and cold-stored temperature sensor all are connected with electrically controlled device, its characterized in that:
the design wind speed v at the refrigerating air inlet is stored in the electric control device, and the electric control device is provided with a timing module; the accumulated air water content passing through the evaporator during the operation of the refrigerator is called M;
in the stage of designing the refrigerator, after the structure of the refrigerator is determined, the value of the parameter X and the value of the parameter N are determined through tests; when M is larger than or equal to X, defrosting is started; the meaning of N is: when M is equal to X, the working time of the defrosting device for ensuring that the defrosting of the evaporator achieves the design effect is ensured;
the defrosting control is sequentially carried out according to the following steps in the running process of the refrigerator:
the first step is that in the continuous operation of the refrigerator, when the judgment condition is satisfied, the electric control device judges whether the frosting basic condition is satisfied;
the judgment condition is that the compressor is started, or the fan is started, or the refrigerating 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 base condition is not met; performing the second step operation when the frosting base condition is met;
the second step is that the air water content is calculated in a time-sharing manner, the results of the air water content calculated in each time-sharing manner are accumulated, and when the accumulated air water content M passing through the evaporator is larger 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.
2. The defrosting control method of the air-cooled refrigerator according to claim 1, characterized in that: in the second step, the electric control device calculates the time-sharing air water content H according to the algorithm 1, and the timing module is cleared after each calculation; calculating the cumulative air moisture content M through the evaporator according to algorithm 2; after the second step is finished, the electric control device clears the calculation result;
the algorithm 1 is: h = v Δ tx S × (RH 1% -RH 2%) xW × ρ × α;
v is the designed wind speed at the refrigerating air inlet stored in the electric control device;
the time-sharing length for refrigerating the refrigerating chamber when the water content H of the air is calculated 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 the operation of calculating the H value once according to the algorithm 1, and returns to the first step after calculation and performs the operation of calculating the water content of the air at the next time;
the continuous calculation conditions were: the time for opening the refrigeration door or timing once reaches t; delaying for 5 seconds before returning to the first step when the refrigerating door is opened;
during the second step, when the pause calculation condition is met, the electric control device carries out the operation of calculating the H value once according to the algorithm 1, and pauses the second step after the calculation; the pause calculation condition is the inverse condition of the frosting base condition, namely the compressor is closed or the fan is closed or the refrigerating air door is closed; after the second step is suspended, when the frosting basic condition is met, the second step is resumed;
s is the area of the refrigerating air inlet;
RH1% is the relative humidity of the inlet air of the refrigerating chamber when the time-sharing calculation is started;
RH2% is the relative humidity of the inlet air of the refrigerating chamber when the time sharing is finished;
w is the moisture content of the saturated humid air at the set temperature of the refrigerating chamber;
rho is dry air density at the set temperature of the refrigerating chamber;
α is a correction coefficient; when the ambient humidity measured by the humidity sensor outside the box is less than or equal to the cold measured by the humidity sensor inside the boxWhen the humidity of the storeroom is high, alpha is 1; when the ambient humidity is greater than the refrigerator compartment humidity, α ═ is (ambient temperature/refrigerator compartment humidity) 0.5 ；
The algorithm 2 is: m = the sum of the air water contents H for each time division.
3. The defrosting control method of the air-cooled refrigerator according to claim 1 or 2, characterized in that: a compartment with the set temperature exceeding 0 ℃ in the air-cooled refrigerator is called a high-temperature compartment;
when the number of the high-temperature chambers is more than 1, calculating the M value of each high-temperature chamber according to the defrosting control method of the air-cooled refrigerator in claim 1 or 2, and adding the M values calculated for the high-temperature chambers to obtain M General assembly When M is General assembly And starting defrosting when the temperature is more than or equal to X.
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