A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps

• The impact of frost growth on ASHP system performances under simulated environments is experimented.
• A novel defrosting control method for air source heat pump is presented.
• Validated experiment is conducted on another ASHP unit under simulated environments.
• The defrosting initiation point given by applying the novel defrost method is more reasonable.

When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting control method. In this paper, an experiment was carried out on an ASHP unit with a capillary tube as a throttle device, under simulated frosting and defrosting conditions using time control defrosting method, and the experimental results are firstly presented. Secondly, a novel defrosting control method based on the degree of refrigerant superheat (DS) is reported. To validate the novel defrosting control method, a further experiment was conducted on another ASHP unit with an electronic expansion valve (EEV) as a throttle device, under simulated frosting and defrosting conditions. The experimental results demonstrated that when applying the novel defrosting control method, defrosting was initiated before the operating performances of ASHP unit rapidly deteriorated, which was more reasonable.