The entropy balance for any system undergoing any

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Unformatted text preview: ntropic turbine work ws h1 h2s Isentropic compressor work ws h2s h1 wa h2a h1 Actual compressor work 2 h1 h2a Actual KE at nozzle exit 2a 2 Isentropic KE at nozzle exit h1 h2s 2s In these relations, h2a and h2s are the enthalpy values at the exit state for actual and isentropic processes, respectively. The entropy balance for any system undergoing any process can be expressed in the general form as Sin Sout 14243 Sgen 123 ∆Ssystem 123 Net entropy transfer by heat and mass Entropy generation Change in entropy (kJ/K) (kJ/kg) The work done during a steady-flow process is proportional to the specific volume. Therefore, υ should be kept as small as possible during a compression process to minimize the work input and as large as possible during an expansion process to maximize the work output. The reversible work inputs to a compressor compressing an ideal gas from T1, P1 to P2 in an isentropic (Pυk constant), constant), or isothermal (Pυ constant) polytropic (Pυn manner, are determined by integration for each case with the...
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This document was uploaded on 11/28/2012.

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