Engineering · Compressed Air — Two-Stage
A two-stage air compressor with an intercooler is more efficient than a single-stage unit for high pressures because cooling between stages:
- AIncreases the air temperature
- BEliminates the need for a relief valve
- CAdds moisture to the air
- DReduces the work of compression and the discharge temperature✓ Correct
Explanation
Intercooling brings the air temperature down between stages, moving compression closer to isothermal. This lowers the work required and the final discharge temperature, and condenses out moisture that is then drained.
Authority: Modern Marine Engineer's Manual; air compressors
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