Using Energy Concepts and the Ideal Gas Model
Steam, initially at 700 lbf/in.2, 550°F undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 3000 lbf/in.2 Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu per lb of steam, for a polytropic exponent of 1.6,
(a) using data from the steam tables.
(b) assuming ideal gas behavior.
Using IT, plot the heat transfer per unit mass of steam for polytropic exponents ranging from 1.0 to 1.6. Investigate the error in the heat transfer introduced by assuming ideal gas behavior.
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