Question

A 5 kg mass of R134a refrigerant is compressed polytropically from the state initial: p1 = 1 bar, T1 = 27 ° C until the final state: p2 = 15 bar, T2 = 227 ° C. Specific heat R134a medium at constant volume, Cv = 0.72 kJ / kg K. Calculate:
a) exponent of polytropy;
b) final volume;
c) final volume using the virial state equation d) work done on the gas for compression;
e) amount of heat given up by the refrigerant fluid;
f) temperature at which the process is reversible
g) process trajectory in the diagrams p vs v, T vs v, h vs v and s vs v

Answer 1