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GATE Mechanical Engineering (ME) 2012 Solved Paper

Question Numbers: 60-61

A refrigerator operates between 120 kPa and 800 kPa in an ideal vapour compression cycle with R-134a as the refrigerant. The refrigerant enters the compressor as saturated vapour and leaves the condenser as saturated liquid The mass flow rate of the refrigerant is 0.2 kg/s. Properties for R – 134a are as follows

Saturated R – 134a
P(kPa)	T°C	h_f(kJ/kg)	h_g (kJ/ kg)	S_f(kJ / kg.k)	S_g(kJ /kg.k)
120	-22.32	22.5	237	0.093	0.95
800	31.31	95.5	267.3	0.354	0.918

Superheated R – 134a
P(kPa)	T°C	h (kJ/ kg)	S (kJ / kg.k)
800	40	276.45	0.95

Question : 61 of 65

Marks: +1, -0

The rate at which heat is extracted in kJ/s from the refrigerated space is

28.3
42.9
34.4
14.6

Validate

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