Air cooling unit defrosting control method and system

Abstract

The invention discloses an air cooling unit defrosting control method and an air cooling unit defrosting system. The method comprises the steps that: a controller collects environment temperature and air suction pressure, and the air suction saturation evaporation temperature corresponding to the air suction pressure is calculated; whether the condition conforms to the defrosting condition or not is judged, and if so, a unit carries out defrosting; the controller collects the coil pipe temperature, and whether the condition conforms to the defrosting quitting condition or not is judged; if the condition conforms to the defrosting quitting condition, the unit quits the defrosting; and if the condition does not conform to defrosting quitting condition, the defrosting is not quitted until the condition conforms to the defrosting quitting condition. When the technical scheme disclosed by the invention is adopted, the defrosting degree of a unit air side heat exchanger is determined through the function relationship between the environment temperature and the saturation evaporation temperature corresponding to the air suction pressure, whether the defrosting is needed or not is determined, the conditions of occurrence of false defrosting and frequent defrosting are avoided, and the unit is ensured to effectively exert the capability during the heating operation.

Description

technical field [0001] The invention belongs to the application technical field of air conditioners, and in particular relates to a defrosting control method and system for an air-cooled unit. Background technique [0002] During the heating operation of the air-cooled unit in winter, due to the low ambient temperature, the evaporation temperature of the heat exchanger on the wind side of the unit is low. The distance between them is getting smaller and smaller, resulting in larger and larger wind resistance of the heat exchanger, smaller and smaller wind speed, and smaller unit capacity. In order to improve the performance of the unit, various manufacturers defrost during the heating process of the unit. [0003] Usually: the judging condition for the defrosting entry of the air-cooled unit is realized by the combination of three conditions: the coil temperature of the wind-side heat exchanger, the ambient temperature, and the running time. We found that the air-cooled un...

AI Technical Summary

Problems solved by technology

[0006] The air-cooled unit is not easy to frost when the ambient dry bulb temperature is low and the wet bulb temperature is also low. The unit actually has no frost and does not need to defrost the unit, but the unit defrosts regularly, causing the heating performance of the unit to not be effectively exerted

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