Refrigerant-134a is to be compressed from 0.2 MPa and -5oC to 1 MPa and 50oC steadily by

Question:

Refrigerant-134a is to be compressed from 0.2 MPa and -5oC to 1 MPa and 50oC steadily by an adiabatic compressor. Taking the environment conditions to be 20oC and 95 kPa, determine
(a) The specific energy change of the refrigerant and
(b) The minimum work input (magnitude only) that needs to be supplied to the compressor per unit mass of the refrigerant