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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /2969/CH4/EX4.10/Ex4_10.sce | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '2969/CH4/EX4.10/Ex4_10.sce')
| -rwxr-xr-x | 2969/CH4/EX4.10/Ex4_10.sce | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/2969/CH4/EX4.10/Ex4_10.sce b/2969/CH4/EX4.10/Ex4_10.sce new file mode 100755 index 000000000..2638b3de2 --- /dev/null +++ b/2969/CH4/EX4.10/Ex4_10.sce @@ -0,0 +1,52 @@ +clc
+clear
+//DATA GIVEN
+V=0.9; //capacity of spherical vessel in m^3
+p1=8; //pressure of steam in bar
+x1=0.9; //dryness fraction of steam
+p2=4; //pressure of steam after blow off in bar
+p3=3; //final pressure of steam in bar
+
+//At 8 bar, from steam tables
+hf1=720.9; //kJ/kg
+hfg1=2046.5; //kJ/kg
+vg1=0.240; //m^3/kg
+
+m1=V/(x1*vg1); //mass of steam in the vessel in kg
+
+h1=hf1+x1*hfg1; //enthalpy of steam before blowing off (per kg)
+//enthalpy of steam before blowing off (per kg) = enthalpy of steam after blowing off (per kg)
+h2=h1;
+//h2=hf2+x2*hfg2
+//At 4 bar, from steam tables
+hf2=604.7; //kJ/kg
+hfg2=2133; //kJ/kg
+vg2=0.462; //m^3/kg
+x2=(h2-hf2)/hfg2; //dryness fraction at 2
+
+m2=V/(x2*vg2); //mass of steam in the vessel in kg
+m=m1-m2; //mass of steam blown off in kg
+
+//As it is constant volume cooling, x2*vg2(at 4 bar)=x3*vg3(at 3 bar)
+//At 3 bar, from steam tables
+hf3=561.4; //kJ/kg
+hfg3=2163.2; //kJ/kg
+vg3=0.606; //m^3/kg
+
+x3=x2*vg2/vg3;
+h3=hf3+x3*hfg3;
+
+//heat lost during cooling, Qlost=m(u3-u2)
+u2=h2-p2*10^5*x2*vg2*10^-3;
+u3=h3-p3*10^5*x3*vg3*10^-3;
+Qlost=m*(u3-u2);
+
+printf(' (i) The Mass of of steam blown off is: %1.3f kg. \n',m);
+printf(' (ii) The Dryness fraction of steam in the vessel after cooling is: %1.4f. \n',x3);
+printf('(iii) The Heat lost during cooling is: %3.2f kJ. \n',(-Qlost));
+
+//NOTE:
+//The answers of m1,x3 are INCORRECT in the book,
+//thus, the answers of m, x3 and Qlost are INCORRECT in the book
+//while, the values obtained her (in scilab) are CORRECT.
+
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