Question

(6) Gas Refrigeration Air is the working fluid of a Brayton refrigeration cycle with a compressor pressure ratio of 3. At the beginning of the compression, the temperature Ti = 270 K and pressure P1 = 140 kPa. The turbine inlet temperature is T3 = 320 K. You may assume both heat exchangers operate without pressure losses. Draw a T-s diagram for this ideal cycle. If the volumetric flow rate at State 3 is 0.4 m3/s, what is the mass flow rate of air? Determine the net power input, refrigeration capacity, and coefficient of performance.

Answer 1

Final Ans :-

mass flow rate = 1.83 kg/sec

Net power input = 14.806 KJ/kg

refrigeration capacity = 38.303 KJ/kg

COP = 2.5

Note :- specific enthalpy in this solution are find from the air table at given pressure and temperature.

2) You must focus on unit.

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