A new dynamic heat pump simulation model with variable speed compressors under frosting conditions

A dynamic heat pump simulation model under frosting condition is proposed. Toward this end, a simple frosting model is proposed based on the perfect analogy between heat and mass transfer including heat conduction. The proposed frosting model is first validated against experimental data for the flat plate boundary layer at various temperatures and relative humidity. Then, the model is incorporated into a quasi-dynamic heat pump simulation which adopts segment-by-segment local heat exchanger model and variable speed compressors. It is shown that the proposed model can naturally represent non-uniform frosting on the heat exchanger surface, and the interaction between frosting and heat pump cycle.