On-demand defrosting method for air cooler

Abstract

The invention relates to an on-demand defrosting method for an air cooler. The on-demand defrosting method comprises the steps that S1, a thickness sensor, an air pressure sensor, a temperature sensorand a pressure sensor are mounted; S2, a frost layer thickness threshold value, an air pressure threshold value, a temperature threshold value and a pressure threshold value are set; S3, the real-time thickness of a frost layer is detected and compared with the frost layer thickness threshold value, the real-time air pressure is detected and compared with the air pressure threshold value, the real-time temperature is detected and compared with the temperature threshold value, and the real-time pressure is detected and compared with the pressure threshold value; S4, when the real-time air pressure is smaller than the air pressure threshold value, delayed starting is conducted, and when at least one of the conditions that the real-time thickness is larger than or equal to the frost layer thickness threshold value, the real-time temperature is larger than or equal to the temperature threshold value and the real-time pressure is smaller than or equal to the pressure threshold value in delaying is met, starting is conducted immediately; and S5, when at least two of the conditions that the real-time temperature is decreased to the temperature threshold value, the real-time thickness iszero and the real-time pressure is increased to the pressure threshold value are met, stopping is conducted. The refrigeration and defrosting period is effectively controlled, the operation cost is saved, and the operation economic efficiency of the air cooler is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to an on-demand defrosting method for a cooling fan used in a cold storage. Background technique [0002] As a device for direct heat exchange between the refrigeration system and the cold storage, the cooling fan's heat transfer performance directly affects the normal and stable use of the cold storage. At this stage, heat exchanger manufacturers at home and abroad have basically solved the phenomenon of lower thermal conductivity caused by the lack of close contact between tubes and fins and oil pollution on the surface of fins by improving processing technology and upgrading manufacturing equipment. However, during the use of the air cooler, when the temperature in the cold storage is low, the frost condensed on the surface of the air cooler cannot be effectively removed, and it will accumulate thicker and thicker on the surface of its fins. The frost layer increases the he...

AI Technical Summary

Problems solved by technology

However, during the use of the air cooler, when the temperature in the cold storage is low, the frost condensed on the surface of the air cooler cannot be effectively removed, and it will accumulate thicker and thicker on the surface of its fins. The frost layer increases the heat transfer resistance, causing the air cooler to change. The thermal performance is getting worse and worse, and timely and effective defrosting can ensure the stable operation of the refrigeration system and the constant storage temperature

[0003] At present, water defrosting methods, hot gas defrosting and electric defrosting are often used for defrosting, but water defrosting is inconvenient to use in low-temperature cold storage, that is, it consumes a lot of water resources, and it is easy to cause ice blockage in flushing drains, hot gas defrosting and electrical defrosting. Electric defrosting is to transfer heat to the air cooler to melt the frost. For the use of cold storage, the heat transferred to the storage needs to be discharged out of the storage through refrigeration in the later stage; most of the defrosting is basically based on statistics of running time and Temperature control or time control is the main method, that is, defrosting is forced to run for a certain period of time, and the length of defrosting time is controlled by setting a fixed time or using a temperature sensor. This control method is neither accurate nor energy-saving, and defrosting is very easy If the time is too long, the temperature of the air cooler will rise, the temperature of the storage room will fluctuate too much, or the defrosting will not be complete, and the air inlet of the air cooler will be blocked by frost. Therefore, effective and precise defrosting is a direct and effective means to reduce the energy consumption of the cold storage.

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