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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a The process for which the specific enthalpy chan... View the full answer