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+clc
+clear
+//INPUT DATA
+P=11;//Power used to run the compressor in kW
+h1=188.41;//total heat of gas leaving refrigeration in kJ/kg
+h2=213.53;//total heat of gas leaving compressor in kJ/kg
+h4=77.46;//total heat of liquid before throttling in kJ/kg
+
+//CALCULATIONS
+Re=h1-h4;//refrigeration effect
+wd=h2-h1;//work done
+cop=Re/wd;//COP of refrigerant system
+m=P/wd;//mss of refrigerant 
+
+//OUTPUT
+printf('(i)COP is %3.3f \n (ii)mass of refrigerant %3.4f kg/s ',cop,m)
+
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