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Reciprocating Compressor
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Multistage Reciprocating Compressor
it is seen from this equation that as the pressure ratio increases the volumetric efficiency decreases. This is illustrated in the next Figure.
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Effect of delivery pressure on the volumetric efficiency
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Effect of intercooling on the compression work
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Example 6
In a single-acting, two-stage reciprocating air compressor 4.5 kg of air per minute are compressed from 1.013 bar and 15°C through a pressure ratio of 9 to 1. Both stages have the same pressure ratio, and the law of compression and expansion in both stages is pV1.3 = constant. If intercooling is complete, calculate the indicated power and the cylinder swept volumes required. Assume that the clearance volumes of both stages are 5% of their respective swept volumes and that the compressor runs at 300 rev/rnin.
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Plan showing intercooling between compressor stages
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T-s diagram showing intercooling and aftercooling
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The ideal intermediate pressure
= 0