Question

A gas enters a compressor that provides a pressure ratio (exit pressure to inlet pressure) equal to 8. If a gage indicates the gas pressure at the inlet is 5.5 psig, what is the absolute pressure, in psia, of the gas at the exit?

Answer 1

`P_2=160\ psia`

Step-by-step explanation:

Given that

Pressure ratio ,r= 8

Gauge pressure at inlet = 5.5 psig

Lets take atmospheric pressure = 14.5 lbf/in²

The absolute presure at inlet

P₁ =5.5 + 14.5 psia

P₁= 20 psia

Lets take absolute pressure at the exit =P₂

`r=(P_2)/(P_1)`

`P_2=8* 20\ psia`

`P_2=160\ psia`

Therefore the absolute pressure at the exit will be 160 psia.