{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# CHAPTER 6:Condensers and Cooling Towers" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Example 6.1,PAGE NUMBER:77" ] }, { "cell_type": "code", "execution_count": 1, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "Cooling Rating= 0.8 kW/K\n", "Temperature Difference at 15°C=10°C\n", "The Condensing temperature at 15°C=25°C\n" ] } ], "source": [ "# Variable declaration\n", "Q_1=12;# Heat load in kW\n", "T_c1=50;# The condensing temperature in °C\n", "T_o1=35;# The maximum outdoor temperature in °C\n", "T_o2=15;# The reduced outdoor temperature in °C\n", "Q_2=8;# The reduced heat load in kW\n", "\n", "# Calculation\n", "deltaT=T_c1-T_o1;# Temperature Difference in K\n", "CR=Q_1*10**3/deltaT;# Condenser Rating in W/K\n", "CR=CR*10**-3;# Condenser Rating in kW/K\n", "deltaT_15=Q_2/CR;# Temperature Difference at 15°C \n", "T_c2=T_o2+deltaT_15;#The Condensing temperature at 15°C\n", "print\"Cooling Rating=\",round(CR,1),\"kW/K\"\n", "print\"Temperature Difference at 15°C=%2.0f°C\"%deltaT_15\n", "print\"The Condensing temperature at 15°C=%2.0f°C\"%T_c2" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Example 6.2,PAGE NUMBER:80" ] }, { "cell_type": "code", "execution_count": 2, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "43.0 kg/s water flow is required.\n" ] } ], "source": [ "# Variable declaration\n", "deltaT=5.2;# The temperature rise in K\n", "E=930;# Total duty at the condenser in kW\n", "C_pw=4.187;# The specific heat of water in kJ/kg K\n", "\n", "# Calculation\n", "mdot=E/(deltaT*C_pw);# The amount of water required in kg/s\n", "print round(mdot,0),\"kg/s water flow is required.\"" ] }, { "cell_type": "markdown", "metadata": { "collapsed": true }, "source": [ "## Example 6.3,PAGE NUMBER:80" ] }, { "cell_type": "code", "execution_count": 3, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "\n", "Evaporation rate=0.37 kg/s \n", "Circulation rate,80times=30 kg/s \n", "Circulation rate,160times=60 kg/s \n", "Air flow rate=54 kg/s\n" ] } ], "source": [ "# Variable declaration\n", "E_t=880;# Total duty at the condenser in kW\n", "E_wcp=15;# Total duty at water-circulating pump in kw\n", "\n", "# Calculation\n", "E=E_t+E_wcp;# Total tower duty in kW\n", "w_er=E*0.41*10**-3;# Evaporation rate in kg/s\n", "Cr_80=30;# Circulation rate in kg/s\n", "Cr_160=60;# Circulation rate in kg/s\n", "w_air=E*0.06;# Air flow rate in kg/s\n", "print\"\\nEvaporation rate=%0.2f kg/s \\nCirculation rate,80times=%2.0f kg/s \\nCirculation rate,160times=%2.0f kg/s \\nAir flow rate=%2.0f kg/s\"%(w_er,Cr_80,Cr_160,w_air)" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## Example 6.4,PAGE NUMBER:85" ] }, { "cell_type": "code", "execution_count": 4, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "\n", "Rate of make up=0.67 kg/s \n", "Rate of bleed off=0.31 kg/s\n" ] } ], "source": [ "# Variable declaration\n", "Cc=700;# The cooling capacity in kW\n", "P_c=170;# The compressor power in kW\n", "c_b=0.0012;# Concentration of solids in bleed-off (kg/kg)\n", "c_m=0.00056;# Concentration of solids in make-up water in kg/kg\n", "\n", "# Calculation\n", "E_tc=Cc+P_c;# Cooling tower capacity in kW\n", "h_fg=2420;# Latent heat of water vapour in kJ/kg\n", "w_e=E_tc*10**3/h_fg;# Rate of evaporation in g/s\n", "w_m=(w_e*(c_b))/(c_b-c_m);# Rate of make up in kg/s\n", "w_bo=w_m-w_e;# Rate of bleed off in kg/s\n", "print\"\\nRate of make up=%0.2f kg/s \\nRate of bleed off=%0.2f kg/s\"%(w_m/1000,w_bo/1000)\n" ] } ], "metadata": { "kernelspec": { "display_name": "Python 2", "language": "python", "name": "python2" }, "language_info": { "codemirror_mode": { "name": "ipython", "version": 2 }, "file_extension": ".py", "mimetype": "text/x-python", "name": "python", "nbconvert_exporter": "python", "pygments_lexer": "ipython2", "version": "2.7.11" } }, "nbformat": 4, "nbformat_minor": 0 }