Q14. A single stage, single acting air compressor is used to charge a large air receiver. The bore diameter is 750 mm and the stroke length is 950 mm. The clearance volume is 0.03 m3 and the index of compression and expansion is 1.31. The mechanical efficiency is 87%. Suction pressure and temperature are 1.00 bar and 25°C respectively. The compressor runs at 300 rev/min.
(a) Calculate, for a delivery pressure of 6 bar, EACH of the following:
(i) The power input required
(ii) The rate of jacket cooling.
(b) Explain why the mass flow rate of air decreases as the delivery pressure rises.
(c) Calculate the maximum theoretical delivery pressure which this compressor can achieve from the given suction conditions.
Note: For air, R = 0.287 kJ/kg K and Cp = 1.005 kJ/kg K.
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