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An after-cooler provided in reciprocating compressors performs the function of _____.
1. reducing temperature of compressed air
2. removal of moisture from compressed air
3. removal of impurities from compressed air
4. reducing the volume of compressed air

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Correct Answer - Option 1 : reducing temperature of compressed air

Explanation:

After-cooler

  • High temperatures are produced when air is compressed and hence its efficient cooling is important.
  • The after-cooler is a heat exchanger intended to reduce the temperature of the hot air discharged from the compressor to approximately 15°C to 25°C above that of the ambient air.
  • Two basic types of after-coolers are (1) air-cooled after-cooler and (2) water-cooled after-cooler.
  • Air-cooled after-cooler uses the ambient air to cool the hot air discharged from the compressor. 
  • In the water-cooled after-cooler, the hot compressed air is passed through the after-cooler tubes and cooling water is passed in the opposite direction through the after-cooler shell.
  • The counter-current flow provides an effective method for reducing the temperature of the compressed air by reducing the temperature, most of the suspended water vapour and some oil vapour will condense to the liquid state.
  • The liquid is then drained away from the system.

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