Question
Table B.7 of Appendix B gives the following values for steam at 400C and 150 bar: H = 2975 kJ/kg, U = 2744 kJ/kg. V
Table B.7 of Appendix B gives the following values for steam at 400°C and 150 bar:
Ĥ = 2975 kJ/kg, Û = 2744 kJ/kg. V̂ = 0.0157m 3 /kg
(a) The value 2975 is not the true specific enthalpy of steam at the given condition. Why not? State the process [H 2 O (__) → H 2 O (__)] for which the specific enthalpy change is 2975 kJ/kg. (Enter the phase, temperature, and pressure of water at the initial and final conditions within the parentheses.)
(b) Estimate the specific enthalpy of steam at 100°C and 1 atm relative to steam at 400°C and 150 bar using the steam tables. Repeat the calculation assuming ideal-gas behavior and Table B.2 or APEx.
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Elementary Principles of Chemical Processes
Authors: Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
4th edition
978-1118431221, 9781119192138, 1118431227, 1119192137, 978-1119498759
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