4. Performance evaluation
Both air-side and refrigerant-side heat transfer capacities can be obtained from the experiment. For the air side, the capacity is calculated in Equation (1):
Where m_ air is the air mass flow rate; hair, in and hair, out are the inlet and outlet air enthalpy at the indoor heat exchanger, respectively. Wout is the air humidity ratio at the outlet of the indoor heat exchanger. W_fan, indoor is the indoor fan power consumption. The indoor fan thermal effect was considered because it is located in the psychrometric loop. It influences the net system capacity since the power input to the indoor fan is eventually converted to heat and dissipated into the air. For the cooling mode, it decreases the net cooling capacity; for the heating mode, it increases the net heating capacity. The system cooling and heating COP is defined in Equation (2):