- In our experiment refrigeration cycle the refrigerant R11 enter the condenser at(30 °C), the water temperature inter the coil to condense the refrigerant was in (14°C)and the exit water temperature was (22°C) the surface area for coil was 45m² if you know the overall heat transfer is 2100w/m².k, Cp for water (4.180kJ/kg.k) calculate the water mass flow rate needed to condense the refrigerant.