Question

An air compressor which compresses air at constant internal energy rejects 80 kJ of heat to the cycling water for every kilogram of air. Calculate the work done during compression stroke per kilogram of air.

Answer 1

work input $W=\Delta U+Q$

compression takes place at constant internal energy therefore, $\Delta U=0$

$W=Q=80KJ$

Work done = 80 KJ