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+clc;clear;
+//Example 2.15
+
+//given values
+Ein=2;
+n1=0.73;
+n2=0.38;//efficency n1 and n2
+CinH=0.09;
+CinB=0.55;//unit cost of electricity and natural gas
+
+//calculation
+QutH= Ein * n1;
+disp(QutH,'rate of energy consumption by the heater in kW');
+CutH= CinH / n1;
+disp(CutH,'the unit cost of utilized energy for heater in USD');
+QutB= QutH / n2 ;
+disp(QutB,'rate of energy consumption by the burner in kW');
+CutB= CinB / n2 / 29.3; // 1 therm = 29.3 kWh
+disp(CutB,'the unit cost of utilized energy for burner in USD')