A three-stage, single-acting air compressor with a polytropic index of 1.22 in all stages, runs in an atmosphere at 101.3 kPa and 25 0C. It has a FAD of 4.2 m3 /min with a delivery pressure of 1.8 MPa. Induction occurs at 92 kPa and 34 0C. The mechanical and motor-drive efficiencies are 88% and 93% respectively. Assume complete intercooling and neglect clearance volumes. cp = 1.006 kJ/kg K cv = 0.717 kJ/kg K 1. calculate the rate of heat rejected in the 2nd intercooler (kW) ? round off to 3 decimal places 2. calculate the mass flow rate of the air in the compressor (kg/min) ?round off to 3 decimal places. 3. calculate the indicated power required of the compressor in kW? round off to 1 decimal place. 4. calculate the input power required from an electric motor? round off to 0 decimal pl
A three-stage, single-acting air compressor with a polytropic index of 1.22 in all stages,
runs in an atmosphere at 101.3 kPa and 25 0C. It has a FAD of 4.2 m3
/min with a
delivery pressure of 1.8 MPa. Induction occurs at 92 kPa and 34 0C. The
and motor-drive efficiencies are 88% and 93% respectively. Assume complete intercooling and neglect clearance volumes.
cp = 1.006 kJ/kg K cv = 0.717 kJ/kg K
1. calculate the rate of heat rejected in the 2nd intercooler (kW) ? round off to 3 decimal places
2. calculate the mass flow rate of the air in the compressor (kg/min) ?round off to 3 decimal places.
3. calculate the indicated power required of the compressor in kW? round off to 1 decimal place.
4. calculate the input power required from an electric motor? round off to 0 decimal place.
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