Q1) Steam at 7 bar and dryness fraction 0.9 expands in a cylinder behind a piston isothermally and reversibly to a pressure of 1.5 bar. Calculate the change of internal energy (u2-u1) and the change of enthalpy (h2-h1) per kg of steam. (Answer: 217.5 kJ/kg and 245.7 kJ/kg )Note : I don't understand how to interpolate to find u2(internal energy) and h2(enthalpy) . I have found u1= 2385.3 and h2= 2557.3 by using wet vapours formula and read values from saturated side.

Given Data P1= 7bar P2=1.5 bar x=0.9

Answered: Steam at 7 bar and dryness fraction 0.9…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q1) Steam at 7 bar and dryness fraction 0.9 expands in a cylinder behind a piston isothermally and reversibly to a pressure of 1.5 bar. Calculate the change of internal energy (u₂-u₁) and the change of enthalpy (h₂-h₁) per kg of steam. (Answer: 217.5 kJ/kg and 245.7 kJ/kg )

Note : I don't understand how to interpolate to find u₂(internal energy) and h₂(enthalpy) . I have found u₁= 2385.3 and h₂= 2557.3 by using wet vapours formula and read values from saturated side.

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