Albert bought a portable device to pump his truck tyres. On the manual, he found out that the device is a single stage, single-acting air compressor. Air delivery for this device is 30 bar at a speed of 1500 rev/min. The atmospheric condition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of theswept volume and the stoke/bore ratio is 1.3/1. Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K Based on pictures below 1 which formula number will be used to evaluate the delivery temperature? 2 which formula number will be used to evaluate the isothermal efficiency? 3 which formula number will be used to evaluate the power input to the compressor?
Albert bought a portable device to pump his truck tyres. On the manual, he found out that the device is a single stage, single-acting air compressor. Air delivery for this device is 30 bar at a speed of 1500 rev/min. The atmospheric condition of his location is 87 kPa and 20 ˚C, with a FAD of 0.22 m2/min. The clearance volume is 4% of theswept volume and the stoke/bore ratio is 1.3/1.
Take “n” as 1.3, cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K
Based on pictures below
1 which formula number will be used to evaluate the delivery temperature?
2 which formula number will be used to evaluate the isothermal efficiency?
3 which formula number will be used to evaluate the power input to the compressor?
4 which formula number will be used to evaluate the bore and stroke?
Solution :
Given data for the above :
Delivery Pressure : 30 bar
RPM Speed : 1500 RPM
Atmospheric Pressure : 87 kPa
Atmospheric Temperature : 20C
FAD (Flow rate ) : 0.22 m2/min
Clearance volume = 4 = Vc = 0.04 Vs
Stroke/Bore = D/L = 1.3/1
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