Consider a two-stage reciprocating air compressor with a perfect intercooler operating at the best intermediate pressure. Air enters the low pressure cylinder at 1 bar, 27 C and leaves the high-pressure cylinder at 9 bar. Assume the index of compression and expansion in each stage is 1.4 and that for air R = 286.7 J/kg K, the work done per kg air in the high pressure cylinder is ________
A. 111 kJ
B. 222 kJ
C. 37 kJ
D. 74 kJ
Ans:
