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+//Variable declaration:
+FV = 1.0                            //Correction factor
+//From example 11.9:
+FE = 0.358                          //Emissivity correction factor
+TH = 300.0+460.0                    //Absolute temperature of external surface (°R)
+TC = 75.0+460.0                     //Absolute temperature of duct (°R)
+AH = 0.622                          //Area of pipe (ft^2)
+s = 0.173*10**-8                    //Stefan-Boltzmann constant
+
+//Calculation:
+Q = FV*FE*AH*s*(TH**4-TC**4)        //Heat transfer rate (Btu/h.ft)
+
+//Result:
+printf("The heat transfer rate is : %.2f Btu/h.ft",Q)
+printf("Since, Q obtained in (11.9) is 96.96 Btu/h.ft, the solution does not match with book.")