{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "# CHAPTER 2:The Refrigeration Cycle" ] }, { "cell_type": "markdown", "metadata": {}, "source": [ "## EXAMPLE 2.1,PAGE NUMBER:21" ] }, { "cell_type": "code", "execution_count": 1, "metadata": { "collapsed": false }, "outputs": [ { "name": "stdout", "output_type": "stream", "text": [ "The Carnot COP for the process is 9.0\n", "The Carnot COP for the refrigeration cycle is 6.0\n", "The Carnot COP for the ideal vapour compression cycle is 5.4\n" ] } ], "source": [ "# Variable Declaration\n", "T_l=0+273;# The required cooling temperature of room in °C\n", "T_h=30+273;# The temperature of outside air in °C\n", "T_e=-5+273;# The evaporating temperature of Refrigeration cycle in °C\n", "T_c=35+273;# The Condensing temperature of Refrigeration cycle in °C\n", "deltaT=5;# The temperature difference at the evaporator and the condenser in K\n", "h_i=249.7;# Enthalpy of fl uid entering evaporator in kJ/kg\n", "h_e=395.6;# Enthalpy of saturated vapour leaving evaporator in kJ/kg\n", "h_sup=422.5;# Enthalpy of superheated vapour leaving compressor in kJ/kg\n", "\n", "# Calculation\n", "CarnotCOP=T_l/(T_h-T_l);\n", "print\"The Carnot COP for the process is\",round(CarnotCOP,1)\n", "# For Refrigeration cycle,\n", "CarnotCOP=T_e/(T_c-T_e);\n", "print\"The Carnot COP for the refrigeration cycle is\",round(CarnotCOP,1)\n", "# For R134a,\n", "Q=h_e-h_i;# Cooling effect in kJ/kg\n", "W_in=h_sup-h_e;# Compressor energy input in kJ/kg\n", "COP=Q/W_in;# Ideal R134a vapour compression cycle COP\n", "print\"The Carnot COP for the ideal vapour compression cycle is\",round(COP,1)\n", "\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 }