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+//ques2

+//The Actual Vapor-Compression Refrigeration Cycle

+clear

+clc

+//state 1 

+P1=0.14;//Pressure in MPa

+T1=-10;//Temperature in C

+h1=246.36;//enthalpy of heat in kJ/kg

+//state 2

+P2=0.8;//Pressure in MPa

+T2=50;//Temperature in C

+h2=286.69;//Enthalpy of heat in kJ/kg

+//state 3

+P3=0.72;//Pressure in MPa

+T3=26;//Temperature in C

+h3=87.83;//Enthalpy in kJ/kg

+

+h4=h3;//throttling

+ms=0.05;//mass flow rate in kg/s

+Qls=ms*(h1-h4);//heat removal in kW 

+Wins=ms*(h2-h1);//Power in kW

+printf('(a) Rate of heat removal = %.2f kW \n',Qls);

+printf('     Power = %.2f kW \n',Wins);

+

+//(b)The isentropic efficiency of the compressor is determined as

+h2s=284.21;

+nc=(h2s-h1)/(h2-h1);

+printf(' (b) Isentropic efficiency = %.3f \n',nc);

+COPr=Qls/Wins;

+printf(' (c) Coefficient of performance of the refrigerator = %.1f \n',COPr);