Air at 108 kPa and 20 oC is compressed steadily by a 5.3 kW compressor to...
- Air at 108 kPa and 20 oC is compressed steadily by a 5.3 kW compressor to 620 kPa and 170 oC . The mass flow rate of air is 1.55 kg/min. The surrounding temperature or the ambient temperature is 17 oC. Calculate the loss of available energy or exergy destroyed in kW.
Assume Cp of air as 1.005 kJ/kg K and gas constant R as 0.287 kJ/kg K . Remember to change temperatures to the Kelvin scale. (Hint: Here entropy transfer due to mass is negative. T2 is less than T_isentropic. So you know how to solve this problem as there is q_out.)
Enter your answer to 4 decimal places in the box below.
Homework Answers
Negative value of answer means
there is loss in available energy
Second law efficiency = (4.5392÷5.3) = 0.8564 => 85.64 %
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