The volumetric efficiency of a reciprocating compressor
decreases both with increasing clearance ratio and pressure ratio
For clearance ratio C, pressure ratio r_p>1 and polytropic re-expansion index n, \(\eta_v=1+C-Cr_p^{1/n}\). Increasing C or r_p lowers volumetric efficiency; increasing n at fixed C and r_p raises it. Thus the unique correct statement is the decrease with both increasing clearance and pressure ratios.
Important Questions from Reciprocating Compressors
For maximum efficiency, the intermediate pressure, P2, in 2-stage reciprocating compressor should be
In a reciprocating compressor, one should aim at compressing the air
The suction pressure is 1 bar and the delivery pressure is 125 bar. What is the ideal intermediate pressure at the end of first stage for a 3-stage air compressor?
In a double-acting compressor, the air is compressed
Consider the following statements. The volumetric efficiency of a reciprocating compressor depends on
(a) Clearance factor
(b) Pressure ratio
(c) Index of expansion
(d) Index of compression
of these statements
