The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)
p₂ = p₁ × p₂
The temperature of air at the beginning of the compression stroke is ________ the atmospheric temperature.
The assumption made in two stage compression with inter-cooler is that