In: Mechanical Engineering
Air undergoes a polytropic process in a piston–cylinder assembly
from p1 = 1 bar, T1 = 295 K
to p2 = 3 bar. The air is modeled as an ideal
gas and kinetic and potential energy effects are negligible.
For a polytropic exponent of 1.2, determine the work and heat
transfer, each in kJ per kg of air,
(1) assuming constant cv evaluated at 300
K.
(2) assuming variable specific heats.