initial commit / add all books

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diff --git a/2969/CH4/EX4.18/Ex4_18.sce b/2969/CH4/EX4.18/Ex4_18.sce
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+clc

+clear

+//DATA GIVEN

+m=1;                           //mass of steam in kg

+p=20;                          //pressure of steam in bar

+Tsup=400+273;                  //temp. of steam in K

+x=0.9;                         //dryness fraction

+Cps=2.3;                       //specific heat of steam in kJ/kgK

+

+//At 20 bar, from steam tables

+Ts=212.4+273;                        //in K

+hf=908.6;                            //kJ/kg

+hfg=1888.6;                          //kJ/kg

+vg=0.0995;                           //m^3/kg

+hsup=hf+hfg+Cps*(Tsup-Ts);           //kJ/kg

+

+//Assume superheated steam to behave as a perfect gas from the commencement of superheating and thus obey Charle's Law

+//By vg/Ts=vsup/Tsup

+vsup=vg*Tsup/Ts;

+usup=hsup-p*10^5*vsup*10^-3;         //internal energy of 1 kg of superheated steam in kJ/kg

+

+h=hf+x*hfg;

+u=h-p*10^5*x*vg*10^-3;               //internal energy of 1 kg of wet steam in kJ/kg

+

+printf('(i) The Internal energy of 1 kg of superheated steam at 400 deg celsius is: %4.2f kJ/kg. \n',usup);

+printf('(ii) The Internal energy of 1 kg of wet steam with dryness fraction 0.9 is: %4.2f kJ/kg. \n',u);