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a) Steam at 500oF and 50 psi is fed at the rate of 1 lbm/sec to an adiabatic compressor where its pressure is raised reversibly to 650 psia. Use data from the steam table to determine the changes in the enthalpy and entropy of the steam in the compression process, and the power rating of the compressor.
b) Steam is fed at the rate of 1 lbm/sec to a compressor where the pressure is raised isothermally at 500oF from 50 to 650 psia. Use data from the steam table to determine the changes in the enthalpy and entropy of the steam in the compression process. Determine the minimum rate at which heat has to be added to or removed from (specify which) the steam. Then determine the minimum power rating of the compressor. How do the results compare with that assuming that steam is an ideal gas? How good is the ideal-gas assumption for steam at 500oF and 650 psia?
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