Study of refrigerant flow rate control methods in a heat pump air conditioning system

Calculates the void fraction in two-phase fluid region by Harms model, and calculates the refrigerant charge quantity in the condenser and evaporator in a heat pump air conditioning system with steady distributed parameter method under refrigeration and heating operating situations. The results show that refrigerant charge quantity in heating operating condition is less than that in refrigeration operating condition. Presents the two refrigerant flow rate control methods of liquid reservoir and ejecting liquid refrigerant based on above investigation.