Physics · Refrigeration and Air Conditioning

A hydrocarbon refrigerator operating on equal proportions of propane and isobutane by mass works on a simple saturation cycle. The condenser and evaporator pressures are 14 bar and 1.4 bar respectively. What is the approximate theoretical COP of the system? (Take properties: h1 = 545 kJ/kg; h3 = h4 = 341.15 kJ/kg; s1 = s2 = 2.47 kJ/kg·K; h2 = 661 kJ/kg and T2 = 63°C)