Air undergoes a polytropic process in a piston cylinder from p1=1bar, T1=295K to

Question

Air undergoes a polytropic process in a piston cylinder from p1=1bar, T1=295K to p2=7bar. The air is modeled as an ideal gas and kinetic and potential energy effects are negligible. For a polytropic exponent of 1.6, determine the work and heat transfer,each in KJ per kg of air.

a) assuming constant Cv evaluated at 300k
b) assuming variable specific heats

Use IT, plot the work andheat transfer per unt mass of air for polutropic exponents ranging from 1.0 to 1.6. Investigate the error in the heat transfer introduced by assuming constant Cv.

ANSWERS ARE
a) delta t=4.77 hours
b) delta t=9.26 hours

Explanation / Answer

Ans. Preksha Kashyap

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