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Unformatted text preview: and the isothermal compression
constant) requires the minimum. The work input
constant or Pυ
requirement for the polytropic case (Pυ n constant) is between these two and
decreases as the polytropic exponent n is decreased, by increasing the heat
rejection during the compression process. If sufficient heat is removed, the
value of n approaches unity and the process becomes isothermal. One common way of cooling the gas during compression is to use cooling jackets
around the casing of the compressors. Multistage Compression with Intercooling
It is clear from these arguments that cooling a gas as it is compressed is desirable since this reduces the required work input to the compressor. However,
often it is not possible to have adequate cooling through the casing of the
compressor, and it becomes necessary to use other techniques to achieve effective cooling. One such technique is multistage compression with intercooling, where the gas is compressed in stages and cooled between each stage
by passing it through a hea...
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This document was uploaded on 11/28/2012.
- Spring '09