Question

An air compressor has an inlet air enthalpy of 35 Btu/lb and an exit enthalpy of 70 Btu/lb. The mass flow of air is 3 lbs/s. If heat loss is 466.62 Btu/min, find the work input to the compressor.

Answer 1

$H_1+Q=H_2+W,$

$W=Q+\Delta H,$

$W=466.62+3(70-35)60=6766.62~\frac{Btu}{min},$

$W=159.5~hp.$