A model of heat pump clothes dryer was developed in this paper

which includes the steady-state heat pump system model and the dynamic fabric drying process model. The simulation results reached a good agreement with the test data of a household heat pump clothes dryer. The drying time error is within 3 minutes and the electricity consumption error is -2.3%. Based on the model

the impact of component size and key system parameters (such as circulation air flow rate

ratio of circulating air

and refrigerant charge) on SMER (Specific Moisture Extraction Rate) and drying time were analyzed. The results indicated that maximum SMER would be achieved at 180 m3/h circulation air flow rate and 9%-10% fresh air to circulating air. Within condensing temperature limit

more refrigerant charge would favor SMER. The results are useful for the system design of heat pump clothes dryer.