diff options
Diffstat (limited to '2969/CH4/EX4.18/Ex4_18.sce')
| -rwxr-xr-x | 2969/CH4/EX4.18/Ex4_18.sce | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/2969/CH4/EX4.18/Ex4_18.sce b/2969/CH4/EX4.18/Ex4_18.sce new file mode 100755 index 000000000..683a454b4 --- /dev/null +++ b/2969/CH4/EX4.18/Ex4_18.sce @@ -0,0 +1,26 @@ +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);
|