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 278C 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. Answer: 100 kg/min

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v,-600 m/min P 100 kPa тз-27°C R-134a Pi = 1 MPa Tj = 90°C P.-95 kPa т,-60°C | | | P.-1 MPa T: 30°C