Section: Thermodynamics | Type: NAT | Marks: 2
A refrigerator operates on an ideal vapor compression cycle between the pressure limits of 140 kPa and 800 kPa. The working fluid is the refrigerant R-134a. The refrigerant enters the compressor as saturated vapor at 140 kPa and exits at 800 kPa and 60 ℃. It leaves the condenser as a saturated liquid at 800 kPa. The coefficient of performance (COP) of the refrigerator is ____________ (rounded off to two decimal places). Use the following property data for R-134a: At 140 kPa: hf = 27.06 kJ/kg, hg = 239.19 kJ/kg At 800 kPa: hf = 95.48 kJ/kg, hg = 267.34 kJ/kg At 800 kPa and 60 ℃: h = 296.82 kJ/kg
Answer: 2.45 to 2.55