Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 30°C in a condenser by air. The air enters at 100 kPa and 27°C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 60°C. Determine the mass flow rate of the refrigerant.

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AIR V-600 m /min Pg = 100 kPa T3 = 27°C T, = 90°C 95 kPa Т,-60C P p,01 7-30°C MPa