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+clc;clear;
+//Example 12.5
+
+//given data
+T=20+273.15;//converted into K
+
+//from Table A–11
+vf=0.0008161;
+vg=0.035969;
+
+//calculations
+//using Eq 12-22
+// hfg= T*vfg*(dP/dT)sat
+//(dP/dT)sat b/w 24 C - 16 C 
+dPT=(646.18-504.58)/(24-16);//dP/dT ; values from Table A–11
+vfg=vg-vf;
+hfg=T*vfg*dPT;
+disp(hfg,'the value of the enthalpy of vaporization of refrigerant-134a in kJ/kg')