Control method for conducting defrosting by using heat pump and stopping defrosting

Abstract

The invention provides a control method for conducting defrosting by using a heat pump and stopping defrosting. The control method comprises the following steps that 1, the frosting thickness parameters h are detected in real time and converted into electrical signals T in real time, the electrical signals T are transmitted to a microprocessor, the thickness parameters h1, h2 and h3 are correspondingly converted into the electrical signals T1, T2 and T3, and T1, T2 and T3 are set as three thresholds, wherein 0<h1<h2<h3<5mm, 0<T1<T2<T3<5V, and when T is smaller than T1, a heat pump unit normally runs; when T is equal to or larger than T1 and equal to or smaller than T2, the second step is executed; when T is equal to or larger than T2 and equal to or smaller than T3, the third step is executed; when T is equal to or larger than T3, the fourth step is executed. The control method has the advantages that the frosting thickness of an evaporator can be directly detected by micro waves, theheat pump unit can conduct automatic control according to the detected thickness conditions, the frosting time is prolonged, the heating capacity of the heat pump unit is improved to the greatest extent, and it is really accomplished that when there is frost, the frosting time is prolonged, and when there is not frost, defrosting is not conducted.

Description

technical field [0001] The invention relates to a control method for heat pump defrosting according to frosting thickness. Background technique [0002] Currently, heat pumps build up frost on the heat exchanger of the outdoor unit during heating operation. This is because, since the heat exchanger of the outdoor unit becomes an evaporator during heating operation, the evaporating temperature drops as the outside temperature drops. When the outside temperature is below 5°C, the evaporation temperature during heating operation is -5 to 10°C, and the moisture in the air in contact with the heat exchanger of the outdoor unit turns into frost on the surface of the heat exchanger. Once the frost comes out, the air volume passing through will be reduced, the heat transfer efficiency will be reduced, and the frost will be formed on the heat exchanger of the outdoor unit even more. As a result, the heating capacity is reduced, so it is necessary to reliably detect the thickness of...

AI Technical Summary

Problems solved by technology

During the implementation process, due to the influence of the system and the environment and other factors, there is a big difference between the actual and the theoretical, or the defrosting is not complete, or the defrosting is in advance, which will reduce the heating efficiency of the heat pump