Question:-
The air with enthalpy of 100 kJ/kg is compressed by an air compressor to a pressure and Y temperature at which its enthalpy becomes 200 kJ/kg. The loss of heat is 40 kJ/kg from the compressor as the air passes through it. Neglecting kinetic and potential energies, the power required for an air mass flow of 0.5 kJ/s is
Option (A)
30 kW
Option (B)
50 kW
Option(C)
70 kW
Option(D)
90 kW
Correct Option:
(C)
Question Solution:
Total enthalpy before compressor = total enthalpy after compressor
\ 100 + W = 200 + 40
\ W = 140 KJ/kg
Power = 0.5 x 140 = 70 kW
question-answer-faq-9567