CN110926093A - On-demand defrosting method for air cooler - Google Patents
On-demand defrosting method for air cooler Download PDFInfo
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- CN110926093A CN110926093A CN201911242113.1A CN201911242113A CN110926093A CN 110926093 A CN110926093 A CN 110926093A CN 201911242113 A CN201911242113 A CN 201911242113A CN 110926093 A CN110926093 A CN 110926093A
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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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Abstract
The invention relates to a defrosting method for an air cooler as required, which comprises the steps of S1, installing a thickness sensor, a wind pressure sensor, a temperature sensor and a pressure sensor; s2, setting a frost layer thickness threshold, a wind pressure threshold, a temperature threshold and a pressure threshold; s3, detecting the real-time thickness of the frost layer and comparing with a frost layer thickness threshold, detecting the real-time wind pressure and comparing with a wind pressure threshold, detecting the real-time temperature and comparing with a temperature threshold, and detecting the real-time pressure and comparing with a pressure threshold; s4, delaying to start when the real-time wind pressure is smaller than a wind pressure threshold value; in the time delay, at least one condition of the real-time thickness being more than or equal to the frost thickness threshold, the real-time temperature being more than or equal to the temperature threshold and the real-time pressure being less than or equal to the pressure threshold is met, and the system is started immediately; and S5, stopping when at least two conditions of real-time temperature reduction to a temperature threshold value, real-time thickness 0 and real-time pressure increase to a pressure threshold value are met. The refrigeration and defrosting cycle is effectively controlled, the operation cost is saved, and the economical efficiency of the operation of the air cooler is improved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to an on-demand defrosting method for an air cooler, which is used for a refrigeration house.
Background
The air cooler is used as equipment for directly exchanging heat between the refrigerating system and the refrigeration house, and the quality of the heat exchange performance of the air cooler directly influences the normal and stable use of the refrigeration house. At present, heat exchanger manufacturers at home and abroad basically solve the problem of heat conductivity coefficient reduction caused by loose contact of tube fins, oil stains on the surfaces of the fins and the like by improving processing technology, upgrading manufacturing equipment and the like. However, when the air cooler is used and the temperature in the refrigeration house is low, the frost condensed on the surface of the air cooler can not be effectively removed, the thicker the frost layer is, the heat transfer resistance is increased on the frost layer, the poorer and poorer the heat exchange performance of the air cooler is caused, and the stable operation of the refrigeration system and the constant temperature in the refrigeration house can be ensured by timely and effectively defrosting.
At present, defrosting modes of water defrosting, hot defrosting and electric defrosting are frequently adopted, the water defrosting is inconvenient to use in a low-temperature refrigeration house, namely a large amount of water resources are consumed, a water flushing and draining pipe is easy to be blocked, the hot defrosting and the electric defrosting both convey heat to an air cooler to melt the frost, and the heat conveyed to the interior of the refrigeration house needs to be discharged out of the refrigeration house in the later period in terms of the use of the refrigeration house; most defrosting basically takes statistics of operation time and temperature control or time control as the main, and the defrosting is forced to defrost in a certain time of operation promptly, and defrosting time duration is controlled through setting for fixed time or through temperature sensor, and such control mode is neither accurate nor energy-conserving, and it causes the air-cooler temperature to rise to easily appear defrosting time overlength moreover, and the storehouse temperature fluctuation is too big, or defrosting is incomplete, and the stifled condition such as air-cooler air intake frost takes place, so effective and accurate defrosting is the direct effectual means that reduces the freezer energy consumption.
Disclosure of Invention
The invention aims to provide an on-demand defrosting method for an air cooler, which can accurately control defrosting temperature and defrosting time.
The technical scheme adopted by the invention for solving the technical problems is as follows: an on-demand defrosting method for an air cooler comprises the following steps,
s1, mounting a thickness sensor on the fin, mounting a wind pressure sensor in the air suction cover, mounting a temperature sensor on the surface of the fin, and mounting a pressure sensor in the air return pipe of the air cooler;
s2, setting a frost layer thickness threshold, a wind pressure threshold in the air suction hood, a temperature threshold on the surface of the fin and a pressure threshold in the air return pipe in a PLC system for controlling the air cooling fan;
s3, detecting the real-time thickness of a frost layer by a thickness sensor and comparing the real-time thickness with a frost layer thickness threshold value, detecting the real-time air pressure in an air suction hood by a wind pressure sensor and comparing the real-time air pressure with the wind pressure threshold value, detecting the real-time temperature of the surface of a fin by a temperature sensor and comparing the real-time temperature with a temperature threshold value, and detecting the real-time pressure in an air return pipe by a pressure sensor and comparing the real-time pressure with a;
s4, when the real-time wind pressure is detected to be smaller than the wind pressure threshold value, starting a defrosting program in a delayed mode; when at least one condition of real-time thickness being larger than or equal to a frost layer thickness threshold, real-time temperature being larger than or equal to a temperature threshold and real-time pressure being smaller than or equal to a pressure threshold is detected to be met in the delay process, a defrosting program is started immediately;
and S5, continuously detecting by the thickness sensor, the temperature sensor and the pressure sensor, and stopping the defrosting process when at least two conditions of real-time temperature reduction to a temperature threshold value, real-time thickness of 0mm and real-time pressure increase to a pressure threshold value are met.
More specifically, the time delayed in the defrosting procedure of delayed starting in step S4 is 180S.
More specifically, the frost thickness threshold in step S3 is selected from 1mm to 3 mm.
More specifically, the wind pressure threshold in step S3 is selected by detecting wind pressure with frost thickness variation on the surface of the fin and recording the detection data for analysis, and then forming a thickness-wind pressure variation curve, and selecting a critical point with a large wind pressure variation from the thickness-wind pressure variation curve as the wind pressure threshold.
More specifically, the method for selecting the temperature threshold in step S3 includes detecting defrosting time required for different frost layer thicknesses at different temperatures, recording detection data, analyzing the detection data, forming a plurality of thickness-defrosting time variation curves at the same temperature, and comparing the thickness-defrosting time variation curves to select the temperature value with the shortest defrosting time at the same thickness as the temperature threshold.
More specifically, the pressure threshold in step S3 is selected by detecting the pressure in the return air duct by the frost thickness change on the surface of the fin, recording the detection data, and analyzing the detection data, and then forming a thickness-pressure change curve, and selecting a critical point with a large pressure change from the thickness-pressure change curve as the pressure threshold.
More specifically, the thickness of the frost layer is from 0mm to 3mm, and the detection is carried out once when the thickness of the frost layer is increased by 0.5 mm.
The invention has the beneficial effects that: the air cooler of the defrosting method according to needs integrates refrigeration control and defrosting control, scientifically and effectively controls the refrigeration and defrosting periods of the air cooler, effectively saves the running cost of a refrigeration house, accurately judges the time access point of the air cooler for defrosting by integrating the pressure fluctuation condition in an air suction hood of the air cooler and the pressure fluctuation condition in an evaporator tube detected by a capacitance type frost layer thickness sensor, performs function conversion, and converts the refrigeration mode into the defrosting mode; meanwhile, the surface temperature of the fins is detected through the temperature sensor, the pressure conditions in the capacitive frost layer thickness sensor and the evaporating pipe are determined, a defrosting end point is determined, the condition that defrosting is incomplete or over defrosting is prevented, defrosting of the air cooler is ensured according to needs, and the economical efficiency of the operation of the air cooler is improved.
Drawings
FIG. 1 is a flow control diagram of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
When defrosting as required in the air cooler is designed, the defrosting needs to be determined according to the specific conditions of the air cooler, and because the air coolers of various models are different, the entry points of defrosting needs are different, so that the detection needs to be carried out according to four parameters of the thickness of a frost layer, the air pressure in an air suction cover, the surface temperature of fins and the pressure in an air return pipe of the air cooler, and a proper entry point and a proper detection position are selected.
Firstly, selecting a frost layer thickness threshold value for the thickness of a frost layer needing defrosting, starting defrosting operation when the thickness of the frost layer reaches the frost layer thickness threshold value, wherein the frost layer thickness threshold value is selected to be 1 mm-3 mm, and after a plurality of tests, obtaining test data that when the distance between fin plates is 4mm, the frost layer thickness threshold value is selected to be 1mm, when the distance between fin plates is 7mm, the frost layer thickness threshold value is selected to be 1.5mm, and when the distance between fin plates is 10mm, the frost layer thickness threshold value is selected to be 2 mm-2.5 mm.
Secondly, selecting a wind pressure threshold value for the wind pressure needing defrosting, wherein the wind resistance is correspondingly increased along with the increase of the thickness of a frost layer, the wind pressure in the air suction cover is gradually reduced, defrosting is considered to be needed when the wind pressure is reduced to the wind pressure threshold value, the maximum value of the thickness of the frost layer is selected between 1mm and 3mm, the maximum value of the thickness of the frost layer in the scheme is 2mm, through testing, a fan of Shilebai FN050-VD is arranged on an air cooler of a certain model, the fan is started, and the wind pressure is reduced by about 80Pa after the frost layer reaches 2 mm; selecting a wind pressure threshold value, namely detecting wind pressure by using the frosting thickness change of the surface of the fin, recording detection data and analyzing the detection data, then forming a thickness-wind pressure change curve, and selecting a critical point with larger wind pressure change from the thickness-wind pressure change curve as the wind pressure threshold value; the thickness of the frost layer is changed from 0mm to 2mm, and the detection of primary air pressure is carried out every time the thickness of the frost layer is increased by 0.5 mm; due to different detection positions of wind pressure, the thickness-wind pressure change curves are different, the wind pressure threshold values are different, and the proper detection position and the wind pressure threshold value are selected through tests.
Then, selecting a temperature threshold value for the surface temperature of the fin needing to be defrosted, increasing the heat transfer resistance between the fin and the air along with the increase of the thickness of the frost layer to cause the temperature of the surface of the fin to be increased, defrosting when the temperature is increased to the temperature threshold value, and selecting 2mm as the maximum value of the thickness of the frost layer in the scheme; the selection method of the temperature threshold comprises the steps of detecting defrosting time required by different frost layer thicknesses at various temperatures, recording detection data and analyzing, forming a plurality of thickness-defrosting time change curves at the same temperature, and comparing the thickness-defrosting time change curves to select the temperature value with the shortest defrosting time at the same thickness as the temperature threshold; the thickness of the frost layer is changed from 0mm to 2mm, and the defrosting time is detected every time the thickness is increased by 0.5mm at the same temperature; due to different detection positions of the temperature, the thickness-defrosting time change curves at different temperatures are different, the temperature threshold values are also different, and tests are carried out to select proper detection positions and temperature threshold values.
Finally, selecting a pressure threshold value for the pressure in the return air pipe of the air cooler needing defrosting, wherein the heat exchange effect of the refrigerant in the heat exchange pipe is deteriorated along with the increase of the thickness of the frost layer, the evaporation capacity of the refrigerant is reduced, the pressure reduction in the return air pipe is detected, defrosting is needed when the pressure is reduced to the pressure threshold value, and the maximum value of the thickness of the frost layer is selected to be 2 mm; the pressure threshold value selection method comprises the steps of detecting the pressure in the return pipe by using the frosting thickness change of the surface of the fin, recording detection data and analyzing the detection data, forming a thickness-pressure change curve, and selecting a critical point with larger pressure change from the thickness-pressure change curve as the pressure threshold value; the thickness of the frost layer is changed from 0mm to 2mm, and the pressure is detected once every 0.5mm is increased; due to different detection positions of the pressure, the thickness-pressure change curves are different, the pressure threshold values are also different, and the proper detection position and the pressure threshold value are selected through experiments.
After the detection position and the corresponding threshold value are selected, the defrosting operation can be performed as required, and the steps of the defrosting-on-demand method shown in fig. 1 are as follows:
s1, according to the mode, selecting a proper detection position on the fin to install the thickness sensor, selecting a proper detection position in the air suction cover to install the wind pressure sensor, selecting a proper detection position on the surface of the fin to install the temperature sensor, and selecting a proper detection position in the air return pipe of the air cooler to install the pressure sensor; the thickness sensor is a capacitive frost thickness sensor, the principle of which is based on the capacitance change to measure the frost thickness, and the measurement data is collected to determine the relation between the capacitance change and the frost thickness.
S2, setting a proper frost layer thickness threshold, a proper wind pressure threshold in the suction hood, a proper temperature threshold on the surface of the fin and a proper pressure threshold in the return air pipe in the PLC system for controlling the air cooler according to the mode.
S3, gather four parameters in the air cooler and compare the judgement in transmitting the parameter signal who gathers to the PLC system, thickness sensor detects the real-time thickness on frost layer and contrasts with frost layer thickness threshold value, the real-time wind pressure in the wind pressure sensor detection cover that induced drafts contrasts with the wind pressure threshold value, temperature sensor detects the real-time temperature on fin surface and contrasts with the temperature threshold value, pressure sensor detects the real-time pressure in the return air pipe and contrasts with the pressure threshold value.
S4, when the real-time wind pressure is detected to be smaller than the wind pressure threshold value, starting a defrosting program after delaying for 180S; and when at least one condition of the real-time thickness being greater than or equal to the frost layer thickness threshold, the real-time temperature being greater than or equal to the temperature threshold and the real-time pressure being less than or equal to the pressure threshold is detected to be met in the time delay process, the defrosting program is not started to defrost the frost layer immediately after time delay.
S5, in the running process of the defrosting program, the thickness sensor, the temperature sensor and the pressure sensor continue to detect, the detection interval time can be set in the PLC system, and when at least two conditions of real-time temperature reduction to a temperature threshold value, real-time thickness of 0mm and real-time pressure rise to a pressure threshold value are met, the frost layer is completely melted, and the defrosting program is stopped.
In conclusion, corresponding data obtained through tests are analyzed, a proper position and a proper frost layer thickness threshold value for detecting the thickness of a frost layer are selected, a proper wind pressure detection position and a proper wind pressure threshold value are selected, a proper temperature detection position and a proper temperature threshold value are selected, a proper pressure detection position and a proper pressure threshold value are selected and input into a PLC system, corresponding real-time data are obtained through sensors for detecting the four parameters and are compared with the corresponding threshold values for analysis, corresponding control operation is carried out through judging built-in defrosting starting and stopping conditions, the refrigeration and defrosting cycle of an air cooler is scientifically and effectively controlled, the running cost of a refrigeration house is effectively saved, the time switch point of the air cooler for defrosting is accurately judged, function conversion is carried out, and the refrigeration mode is converted into the defrosting mode; meanwhile, a defrosting end point is determined, the condition that defrosting is incomplete or excessive is prevented, defrosting of the air cooler is ensured according to needs, and the economical efficiency of operation of the air cooler is improved.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. An on-demand defrosting method for an air cooler is characterized by comprising the following steps of,
s1, mounting a thickness sensor on the fin, mounting a wind pressure sensor in the air suction cover, mounting a temperature sensor on the surface of the fin, and mounting a pressure sensor in the air return pipe of the air cooler;
s2, setting a frost layer thickness threshold, a wind pressure threshold in the air suction hood, a temperature threshold on the surface of the fin and a pressure threshold in the air return pipe in a PLC system for controlling the air cooling fan;
s3, detecting the real-time thickness of a frost layer by a thickness sensor and comparing the real-time thickness with a frost layer thickness threshold value, detecting the real-time air pressure in an air suction hood by a wind pressure sensor and comparing the real-time air pressure with the wind pressure threshold value, detecting the real-time temperature of the surface of a fin by a temperature sensor and comparing the real-time temperature with a temperature threshold value, and detecting the real-time pressure in an air return pipe by a pressure sensor and comparing the real-time pressure with a;
s4, when the real-time wind pressure is detected to be smaller than the wind pressure threshold value, starting a defrosting program in a delayed mode; when at least one condition of real-time thickness being larger than or equal to a frost layer thickness threshold, real-time temperature being larger than or equal to a temperature threshold and real-time pressure being smaller than or equal to a pressure threshold is detected to be met in the delay process, a defrosting program is started immediately;
and S5, continuously detecting by the thickness sensor, the temperature sensor and the pressure sensor, and stopping the defrosting process when at least two conditions of real-time temperature reduction to a temperature threshold value, real-time thickness of 0mm and real-time pressure increase to a pressure threshold value are met.
2. The on-demand defrosting method for an air cooler according to claim 1, wherein the time delay of the delayed defrosting starting procedure in the step S4 is 180S.
3. The defrosting on demand method for an air cooler according to claim 1, wherein the frost layer thickness threshold in the step S3 is selected from 1mm to 3 mm.
4. The on-demand defrosting method for air coolers according to claim 1, wherein the wind pressure threshold in step S3 is selected by detecting wind pressure according to the frosting thickness variation of the fin surface and recording the detection data for analysis, and then forming a thickness-wind pressure variation curve, and selecting a critical point with a large wind pressure variation from the thickness-wind pressure variation curve as the wind pressure threshold.
5. The on-demand defrosting method for an air cooler according to claim 1, wherein the temperature threshold in step S3 is selected by detecting defrosting times required by different frost layer thicknesses at different temperatures, recording detection data, analyzing the detection data, forming a plurality of thickness-defrosting time variation curves at the same temperature, and comparing the plurality of thickness-defrosting time variation curves to select the temperature value with the shortest defrosting time at the same thickness as the temperature threshold.
6. The defrosting-on-demand method for an air cooler according to claim 1, wherein the pressure threshold in step S3 is selected by detecting the pressure in the return air duct according to the frost thickness variation on the surface of the fin, recording the detection data, analyzing the detection data, forming a thickness-pressure variation curve, and selecting a critical point with a large pressure variation from the thickness-pressure variation curve as the pressure threshold.
7. A method for on-demand defrosting of an air cooler according to any one of claims 4 to 6, characterized in that the thickness of the frost layer is from 0mm to 3mm, and the detection is performed every 0.5mm increase of the thickness of the frost layer.
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| CN115682565A (en) * | 2022-10-31 | 2023-02-03 | 海信冰箱有限公司 | Refrigerator and refrigerator defrosting control method |
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