Defrosting control method with optimal comprehensive performance of air heat source pump as target

Abstract

The invention provides a defrosting control method with the optimal comprehensive performance of an air heat source pump as a target. The defrosting control method comprises the steps that when a unit is started, the evaporation pressure / temperature, the inlet air temperature and the inlet air humidity of a finned tube exchanger and the condensation pressure / temperature and hot water side inlet temperature and flow of a condenser are detected, performance parameters of different running periods are calculated through a unit model in a simulation manner, and the optimal unit frosting time under the work condition is obtained according to the calculated maximum value of the performance evaluation coefficient COPc of the different running periods; when the unit carries out heating and runs to the optimal frosting time, defrosting is started; and the temperature of bottom fins of the finned tube exchanger is detected, and when the temperature of the bottom fins of the finned tube exchanger reaches the set value, the unit stops defrosting, and the heating mode is recovered. According to the defrosting control method, the running work condition and the running state of the unit are detected in real time, the growth condition of a frosting layer of the finned tube exchanger can be accurately judged through the unit model, the optimal frosting time of the unit is updated, and the unit can adapt to any work condition to efficiently run.

Description

technical field [0001] The invention relates to the technical field of air source heat pumps, in particular to a defrosting control method aiming at the best overall performance of the air source heat pump. Background technique [0002] When the air source heat pump is in heating operation in winter, frosting occurs on the outdoor heat exchanger. As the thickness of the frost layer on the surface of the finned tube increases, the air circulation area decreases, resulting in an increase in air flow resistance. At the same time, the frost layer increases the heat transfer resistance between the air and the finned tube heat exchanger, degrades the performance of the heat pump, and even causes the heat pump to fail to work normally. Therefore, the heat pump needs to be defrosted in time to ensure the normal operation of the heat pump. [0003] At present, the air source heat pump air conditioner adopts timing defrosting or defrosting according to the ambient temperature and th...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The present invention provides an air source heat pump that can solve the problem of misjudgment or delay in defrosting control when the air source heat pump is running in winter, optimize the operating conditions, improve operating efficiency and indoor comfort, and optimize the overall performance of the air source heat pump. Best-targeted defrosting control method

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