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+{
+"cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Chapter 5: Steam Generation"
+ ]
+ },
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.10: Example_10.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"m=150000 //lb\n",
+"P1=1000 //psia\n",
+"Ts=900 //F\n",
+"Tf=200 //F\n",
+"//calculations\n",
+"disp('From mollier charts,')\n",
+"h2=1448.2 //Btu/lb\n",
+"hf=167.99 //Btu/lb\n",
+"correc=2.2 //Btu/lb\n",
+"hc=hf+correc\n",
+"Q=m*(h2-hc)\n",
+"//results\n",
+"printf('Heat absorption = %d Btu/hr',Q)\n",
+"disp('The answer is a bit different due to rounding off error in textbook')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.11: Example_11.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"m=150000 //lb\n",
+"P1=1000 //psia\n",
+"Ts=900 //F\n",
+"Tf=200 //F\n",
+"//calculations\n",
+"disp('From mollier charts,')\n",
+"h2=1448.2 //Btu/lb\n",
+"hf=167.99 //Btu/lb\n",
+"correc=2.2 //Btu/lb\n",
+"hc=hf+correc\n",
+"Q=m*(h2-hc)\n",
+"output=Q/1000\n",
+"//results\n",
+"printf('Output of the steam generating unit = %d kB/hr',output)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.12: Example_12.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"m=150000 //lb\n",
+"P1=1000 //psia\n",
+"Ts=900 //F\n",
+"Tf=200 //F\n",
+"m2=21000 //lb\n",
+"HV=12000 //Btu/lb\n",
+"//calculations\n",
+"disp('From mollier charts,')\n",
+"h2=1448.2 //Btu/lb\n",
+"hf=167.99 //Btu/lb\n",
+"correc=2.2 //Btu/lb\n",
+"hc=hf+correc\n",
+"Q=m*(h2-hc)\n",
+"output=Q\n",
+"inpu=m2*HV\n",
+"eta=output/inpu\n",
+"//results\n",
+"printf('Efficiency of the steam generating unit = %.1f percent',eta*100)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.13: Example_13.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"hv=11780 //Btu/lb\n",
+"steam=55000 //lb/hr\n",
+"coal=6480 //lb\n",
+"x1=0.66\n",
+"x2=0.044\n",
+"x3=0.079\n",
+"x4=0.015\n",
+"x5=0.11\n",
+"z1=14.5\n",
+"z2=0.2\n",
+"z3=4.4\n",
+"z4=80.9\n",
+"xash=0.076\n",
+"xmois=0.115\n",
+"yc=0.21\n",
+"refuse=622 //lb/hr\n",
+"cp=0.24\n",
+"tg=400 //F\n",
+"ta=70 //F\n",
+"Qco=10160 //Btu/lb\n",
+"Qc=14600 //Btu/lb\n",
+"//calculations\n",
+"disp('From steam tables,')\n",
+"hf=269.6 //Btu/lbm\n",
+"hfg=1.5 //Btu/lbm\n",
+"h1=hf+hfg\n",
+"h2=1196.5\n",
+"Qb=h2-h1\n",
+"h3=1407.7 //Btu/lbm\n",
+"Qs=h3-h2\n",
+"h4=h3-h1\n",
+"out=steam*h4/1000\n",
+"eff=steam*h4/(coal*hv)\n",
+"//Energy balance\n",
+"Ci=coal*x1\n",
+"Cr=refuse*yc\n",
+"Cb=(Ci-Cr)/coal\n",
+"lbt= z1*44+z2*28+z3*32+z4*28\n",
+"lbC=z1*12+z2*12\n",
+"dry=lbt/lbC *Cb\n",
+"loss1=dry*cp*(tg-ta)\n",
+"loss2=z2*12/(lbC) *Cb*Qco\n",
+"loss3=Cr*Qc/coal\n",
+"loss4=xmois*(1089+0.46*tg-ta)\n",
+"loss5=x2*9*(1089+0.46*tg-ta)\n",
+"loss6=steam*h4/coal\n",
+"//results\n",
+"printf('Heat absorbed in the boiler = %.2f Btu per lb of steam generated',Qb)\n",
+"printf('\n Heat absorbed in the superheater = %.2f Btu/lb of steam',Qs)\n",
+"printf('\n Heat absorbed in steam generating = %.2f Btu/lb of steam generated',h4)\n",
+"printf('\n Output of steam generating unit = %d kB',out)\n",
+"printf('\n Efficiency of steam generating unit = %.1f percent',eff*100)\n",
+"printf('\n Carbon burned to CO and CO2 = %.2f lb of C per lb of fuel',Cb)\n",
+"printf('\n Dry products of combustion = %.2f lb per lb of fuel',dry)\n",
+"printf('\n Loss due to sensible heat in dry gaseous products of combustion = %d Btu/lb of fuel',loss1)\n",
+"printf('\n Loss due to CO in dry products of combustion = %.1f Btu/lb of fuel',loss2)\n",
+"printf('\n Loss due to C in refuse = %.1f Btu/lb of fuel',loss3)\n",
+"printf('\n Loss due to evaporating moisture in fuel = %.1f Btu/lb of fuel',loss4)\n",
+"printf('\n Loss due to water vapor formed from H = %.1f Btu/lb of fuel',loss5)\n",
+"printf('\n Energy absorbed in generating steam = %d Btu/lb of fuel',loss6)\n",
+"disp('The answers are a bit different due to rounding off error in the textbook')"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.1: Example_1.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"x=0.98\n",
+"vg=26.80\n",
+"vf=0.01672\n",
+"//calculations\n",
+"vx=x*vg+(1-x)*vf\n",
+"//results\n",
+"printf('Specific volume of wet steam = %.6f cu ft per lb',vx)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.2: Example_2.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"hf=167.99 //Btu/lb\n",
+"hg=4.5 //Btu/lb\n",
+"//calculations\n",
+"hc=hf+hg\n",
+"//results\n",
+"printf('Enthalpy of water = %.1f Btu/lb',hc)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.3: Example_3.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"x=0.97\n",
+"hg=1187.2 //Btu/lb\n",
+"hf=298.40 //Btu/lb\n",
+"hfg=888.8 //Btu/lb\n",
+"//calculations\n",
+"hx1=x*hg+(1-x)*hf\n",
+"hx2=hf+x*hfg\n",
+"hx3=hg-(1-x)*hfg\n",
+"//results\n",
+"printf('\n In case 1, enthalpy = %.1f Btu/lb',hx1)\n",
+"printf('\n In case 2, enthalpy = %.1f Btu/lb',hx2)\n",
+"printf('\n In case 3, enthalpy = %.1f Btu/lb',hx3)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.4: Example_4.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"h1=1172 //Btu/lb\n",
+"hf1=355.36 //Btu/lb\n",
+"hfg1=843 //Btu/lb\n",
+"//calculations\n",
+"h2=h1\n",
+"x1= (h2-hf1)/hfg1\n",
+"//results\n",
+"printf('Quality of steam = %.1f percent',x1*100)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.5: Example_5.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"P=200 //psia\n",
+"x=0.95\n",
+"m=1//lb\n",
+"//calculations\n",
+"disp('From mollier chart,')\n",
+"hx=1156 //Btu/lb\n",
+"sx=1.495 //Btu/lb F\n",
+"//results\n",
+"printf('Enthalpy = %d Btu/lb',hx)\n",
+"printf('\n entropy = %.3f Btu/lb F',sx)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.6: Example_6.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"P=200 //psia\n",
+"T=600 //F\n",
+"m=1 //lb\n",
+"//calculations\n",
+"disp('From mollier chart,')\n",
+"hx=1322 //Btu/lb\n",
+"sx=1.676 //Btu/lb F\n",
+"//results\n",
+"printf('Enthalpy = %d Btu/lb',hx)\n",
+"printf('\n entropy = %.3f Btu/lb F',sx)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.7: Example_7.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"P=200 //psia\n",
+"T=260 //F\n",
+"//calculations\n",
+"disp('From mollier chart,')\n",
+"hx=1174 //Btu/lb\n",
+"x1=2.8\n",
+"y1=100-x1\n",
+"//results\n",
+"printf('Quality = %.1f percent',y1)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.8: Example_8.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"P=200 //psia\n",
+"T=500 //F\n",
+"//calculations\n",
+"disp('From mollier chart,')\n",
+"hi=1269 //Btu/lb\n",
+"hf=1063 //Btu/lb\n",
+"dh=hi-hf\n",
+"y1=91\n",
+"//results\n",
+"printf('Quality = %.1f percent',y1)\n",
+"printf('\n Change in enthalpy = %d Btu/lb',dh)"
+ ]
+ }
+,
+{
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Example 5.9: Example_9.sce"
+ ]
+ },
+ {
+"cell_type": "code",
+ "execution_count": null,
+ "metadata": {
+ "collapsed": true
+ },
+ "outputs": [],
+"source": [
+"clc\n",
+"clear\n",
+"//Initialization of variables\n",
+"P=200 //psia\n",
+"Ts=260 //F\n",
+"Tf=220 //F\n",
+"m=10000 //lb\n",
+"Pc=20 //psia\n",
+"//calculations\n",
+"disp('From mollier charts,')\n",
+"hf=188 //Btu/lb\n",
+"h2=1172 //Btu/lb\n",
+"Q=m*(h2-hf)\n",
+"//results\n",
+"printf('Heat absorption = %d Btu/hr',Q)"
+ ]
+ }
+],
+"metadata": {
+ "kernelspec": {
+ "display_name": "Scilab",
+ "language": "scilab",
+ "name": "scilab"
+ },
+ "language_info": {
+ "file_extension": ".sce",
+ "help_links": [
+ {
+ "text": "MetaKernel Magics",
+ "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+ }
+ ],
+ "mimetype": "text/x-octave",
+ "name": "scilab",
+ "version": "0.7.1"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
generated by cgit (git 2.34.1) at 2024-12-19 19:27:06 +0000