However, with practical devices perfect isothermal compression is not attainable.
2.
Compressors that utilize inter-stage cooling between compression stages come closest to achieving perfect isothermal compression.
3.
In an isothermal compression process, the gas in the system is kept at a constant temperature throughout.
4.
In the isothermal compression of a gas there is work is done on the system to decrease the volume and increase the pressure.
5.
For example, unless you have an infinite number of compression stages with corresponding intercoolers, you will never achieve perfect isothermal compression.
6.
Compared to the Brayton cycle which uses adiabatic compression and expansion, the second Ericsson cycle uses isothermal compression and expansion, thus producing more net work per stroke.
7.
The best method ( i . e . the method involving the least work ) is that of a reversible isothermal compression, which would take work " W " given by
8.
Smaller compressors can approximate isothermal compression even without intercooling, due to the relatively high ratio of surface area to volume of the compression chamber and the resulting improvement in heat dissipation from the compressor body itself.
9.
Isothermal compression or expansion more closely models real life when the compressor has a large heat exchanging surface, a small gas volume, or a long time scale ( i . e ., a small power level ).
10.
By comparing the three internally reversible processes compressing an ideal gas from P _ 1 to P _ 2, the results show that isentropic compression ( Pv ^ k = constant ) requires the most work in and the isothermal compression ( T = constant or Pv = constant ) requires the least amount of work in.
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