Question

A compressor receives R-134a at 20 F, 30 psia with an exit of 200 psia, x = 1. What can you say about the process?

Answer 1

Properties for R-134a are

Inlet state: si = 0.4157 Btu/lbm R

Exit state: se = 0.4080 Btu/lbm R

Steady state single flow:

Since * decreases slightly and the generation term can only be positive, it must be that the heat transfer is negative (out) so the integral gives a contribution that is smaller than -sgen.