Volume 49

Simulation analysis of the air source heat pump performance with distributed defrosting device under frost conditions Xiang Chen, Guangcai Gong, Mingfa Zhang, Xing Shi, Jinchen Tang

Abstract

This work investigates the winter heating performance of air source heat pumps with distributed defrost devices. A dynamic simulation model of the air source heat pump considering the frosting dimensionless correlation equation and the minimum defrost supplemental heat is established based on the finite-time thermodynamic method. The results show that the air source heat pump with different defrost devices has a certain performance improvement compared with the air source heat pump with the electric auxiliary heat system. The rear-mounted type system has the best operational performance during frosting. When the relative humidity is fixed at 98%, the COP of the rear-mounted type system is highest at 0°C. When the ambient temperature is fixed at -2°C, the COP of the rear-mounted type system is highest at the relative humidity of 70%.

Keywords ASHP, distributed defrost device, frosting model, dynamic simulation