Create a P–h diagram for Problem 9.125 using the NIST software plotting capability. Your sketch should show the following:

A. The vapor dome

B. Constant-temperature lines (isotherms) for 10, 20, 95, and 100 F

C. Constant-pressure lines (isobars) for evaporation at 10 F and condensation at 100 F

D. States 1, 2, 3, and 4 with state 1 at the compressor inlet

Problem 9.125

A 1-ton (200 Btu/min) vapor-compression refrigerator uses R-134a as the refrigerant. Evaporation occurs at 10 F and condensation occurs at 100 F. The compressor is reversible and adiabatic. The refrigerant leaves the evaporator at 20 F and leaves the condenser at 95 F. The heating and cooling processes are both at constant pressure. Determine the steady-state power (hp) into the compressor.