A hydrocarbon refrigerator operating on equal proportions of propane and isobutane by mass works on simple saturation cycle. The condenser and evaporator pressure are 14 bar and 1⋅4 bar. What is the approximate theoretical COP of the system? (Take properties: h1 = 545 kJ/kg; h3 = 341⋅15 kJ/kg = h4; S1 = 2⋅47 kJ/kgK = S2; h2 = 661 kJ/kg and T2 = 63°C)
1
1⋅8
2
5⋅4
3
3⋅6
4
2⋅7