initial commit / add all books

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+clc

+clear

+//Input data

+T2=298;//Maximum temperature at which ammonia refrigerating system works in K

+T1=263;//Minimum temperature at which ammonia refrigerating system works in K

+mf=5;//Fluid flow rate in kg/min

+sf1=0.5443;//Liquid entropy at 298 K in kJ/kg K

+sf2=1.1242;//Liquid entropy at 263 K in kJ/kg K

+hfg1=1297.68;//Latent heat at 298 K in kJ/kg

+hfg2=1166.94;//Latent heat at 263 K in kJ/kg

+hf1=135.37;//Liquid enthalpy at point 1 in graph in kJ/kg

+hf2=298.9;//Liquid enthalpy at point 2 in graph in kJ/kg

+TR=210;//One tonne refrigeration in TR

+

+//Calculations

+s2=sf2+(hfg2/T2);//Entropy at point 2 in kJ/kg

+x1=(s2-sf1)/(hfg1/T1);//Dryness fraction at point 1

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

+h=h1-hf2;//Heat extracted of refrigerating effect produced per kg of refrigerant in kJ/kg

+ht=mf*h;//Total heat extracted at a fluid flow rate of 5 kg/min in kJ/min

+C=ht/TR;//Capacity of refrigerating in TR

+

+//Output

+printf('The capacity of refrigerator is %3.0f TR',C)