For questions 3 and 4, 90 kg/min of refrigerant-134a at 1.2 MPa and 100°C is to be cooled to 1.2 MPa and 44°C in a condenser by air. The air enters at 100 kPa and 22°C and leaves at 95 kPa and 62°C. Determine:
Air:
P3 = 100 kPa
T3 = 22°C
P4 = 95 kPa
T4 = 62°C
R-134a:
m1 = 90 kg/min
P1 = 1.2 MPa
T1 = 100°C
P2 = 1.2 MPa
T2 = 44°C
The heat rate transfer of the refrigerant. Give your answer to two decimal places.
The mass flow rate of air required for this to be possible. Give your answer to two decimal places.