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+//Chapter-6, Illustration 16, Page 323

+//Title: Refrigeration cycles

+//=============================================================================

+clc

+clear

+

+//INPUT DATA

+P1=25;//Pressure at point 1 in bar

+P2=60;//Pressure at point 2 in bar

+h2=208.1;//Vapour enthalpy at P2 in kJ/kg

+h3=61.9;//Liquid enthalpy at P2 in kJ/kg

+h4=h3;//Liquid enthalpy at P2 in kJ/kg

+s2=0.703;//Vapour entropy at P2 in kJ/kg-K

+sf1=-0.075;//Liquid entropy at P1 in kJ/kg-K

+sfg1=0.971;//Entropy in kJ/kg-K

+hf1=-18.4;//Liquid Enthalpy at P1 in kJ/kg

+hfg1=252.9;//Latent heat at P1 in kJ/kg

+m=5;//Refrigerant flow in kg/min

+

+//CALCULATIONS

+x1=(s2-sf1)/sfg1;//Quality factor 1

+h1=hf1+(x1*hfg1);//Enthalpy at point 1 in kJ/kg

+COP=(h1-h4)/(h2-h1);//Co-efficient of performance

+QL=(m*(h1-h4))/60;//Capacity of the refrigerator in kW

+

+//OUTPUT

+mprintf('COP of refrigerator is %3.2f \n Capacity of refrigerator is %3.2f kW',COP,QL)

+

+

+

+//==============================END OF PROGRAM=================================