Refrigerant-134a is expanded adiabatically in an expansion valve from 1.2 MPa and 40C to 180 kPa. For

Question:

Refrigerant-134a is expanded adiabatically in an expansion valve from 1.2 MPa and 40°C to 180 kPa. For environment conditions of 100 kPa and 20°C, determine
(a) The work potential of R-134a at the inlet,
(b) The energy destruction during the process, and
(c) The second-law efficiency.