Question

In a two-stage reciprocating air-compressor with suction pressure of 2 bar and delivery pressure of 8 bar, the ideal intercooler pressure will be
1. 10 bar
2. 6 bar
3. 4 bar
4. 3 bar

Answer 1

Correct Answer - Option 3 : 4 bar

Concept:

In a two-stage compressor there is intercooling between the suction and delivery pressure at constant pressure by this intercooling some reduction in work supplied to the compressor another advantage of using multi-stage compression is that greater compression can be achieved compared to the single-stage compression.

For intercooling between the stages using one intercooler the perfect (ideal intercooler) conditions are

\({P_i} = \sqrt {{P_H}{P_L}} \)

Where PL and PH are the suction and delivery pressures respectively.

Calculation:

Given, PL = 2 bar, P_H = 8 bar

\({P_i} = \sqrt {{P_H}{P_L}} = \sqrt {{8}\times{2}}=4\; bar \)