Problem 2 A cylinder-piston assembly contains 0.5 m^3 of helium gas at 150 kPa a

Question

Problem 2 A cylinder-piston assembly contains 0.5 m^3 of helium gas at 150 kPa and 20 degree C. The helium is compressed in a polytropic process (Pv^n =constant; n not equal to cp/Cv) until the final pressure and temperature reach 400 kPa and 140 degree C. If heat is transferred to the surroundings are at 20 degree C, determine: (a) The change of entropy of the helium gas (b) The amount of heat exchanged with the surroundings (c) The entropy generated during this process (d) Is the process reversible, irreversible or impossible? Assume that He behaves as ideal gases with constant specific heats:

Explanation / Answer

PV^n = constant

Also, PV = mRT

V = mRT/P = constant*T/P

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