Defrosting control method applicable to air-cooling heat pump unit

Abstract

The invention provides a defrosting control method applicable to an air-cooling heat pump unit, and relates to the technical field of air-conditioning refrigeration. The method comprises the steps: (1) when in state of stable working condition, measuring the temperature of a first group of fins; (2) measuring the temperature of a second group of fins at intervals and calculating the temperature change rate of the fins in unit time; (3) setting a plurality of types of frosting areas, determining the frosting areas by the temperature change rate of the fins and the measured environment temperature; (4) continuously measuring the environmental temperature and the temperature of the fins, calculating the temperature difference, and defrosting when the temperature difference reaches a set defrosting enter temperature difference of the frosting area and a corresponding defrosting cycle comes; and (5) exiting the defrosting when the temperature of the fins reaches a set defrosting exit temperature of the frosting area, and entering a next defrosting cycle. The defrosting control method can automatically control the enter and exit of defrosting, improve the self adaptivity of the air-cooling heat pump unit on the change of the environmental temperature, and is characterized by accurate and timely defrosting and no need of manual operation.

Description

technical field [0001] The invention relates to the technical field of air conditioning and refrigeration, in particular to a defrosting control method applicable to an air-cooled heat pump unit. Background technique [0002] The air-cooled heat pump unit is favored by users due to its compact structure, dual-purpose, high cooling performance coefficient and other advantages. However, due to the technical difficulties in the defrosting control of this product, it is common for such products to have low thermal efficiency, unstable operation or even burn out of the compressor during heating operation in winter. [0003] In the prior art, air-cooled heat pump units adopt a variety of measures in defrosting control, and in general, fin temperature, ambient temperature, and accumulation time are used as judgment basis for defrosting control. However, due to the diversity of environmental conditions, it is often difficult to use a fixed set of parameters to cope with complex cli...

AI Technical Summary

Problems solved by technology

However, due to the diversity of environmental conditions, it is often difficult to use a fixed set of parameters to cope with complex climate changes, resulting in unsatisfactory defrosting control effects

Either enter the defrosting in advance or enter the defrosting later, which affects the heating effect of the unit

If the defrosting control of the unit is to track the changes in the environment as much as possible, it is necessary to rely on the operator to manually adjust the defrosting control parameters at any time, which is difficult to guarantee in actual use.