In a heat pump that uses R-134a as the working fluid, the R-134a enters the compressor at

Question:

In a heat pump that uses R-134a as the working fluid, the R-134a enters the compressor at 30 lbf/in 2, 20 F at a rate of 0.1 lbm/s, in the compressor the R- 134a is compressed in an adiabatic process to 150 lbf/in 2. Calculate the power input required to the compressor, assuming the process to be reversible.