For a two-stage reciprocating air compressor, the section pressure is 1.6 bar and the delivery pressure is 40 bar. What is the value of the ideal intercooler pressure (in bar)?

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SSC JE Mechanical 11 Oct 2023 Shift 2 Official Paper-I
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  1. 9
  2. 8
  3. 4.56
  4. 20.8

Answer (Detailed Solution Below)

Option 2 : 8
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Detailed Solution

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Concept:

- Intercooler is a device used in compressors to reduce the temperature of the air in between compression stages.

- It reduces temp. of compressed air coming from the previous compression stage. Therefore, air inlet temp. of the subsequent stage reduces.

- As temp. decreases, its density increases, and therefore, the volume of air to be handled decreases

- Therefore, it increases volumetric efficiency and reduces the overall size of the compressor.

- For ideal intercooling and achieving maximum effectiveness of intercooler,

Ideal intercooler pressure 

Where P1 = inlet pressure, P2 = delivery pressure

Calculation:

Data given, 

P1 = 1.6 bar, P2 = 40 bar

 = 8 bar

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