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+//scilab 5.4.1

+clear;

+clc;

+printf("\t\t\tProblem Number 11.15\n\n\n");

+// Chapter 11 : Heat Transfer

+// Problem 11.15  (page no. 574) 

+// Solution

+

+D=3.5/12; //3.5 inch = 3.5/12 feet//Unit:ft //Outside diameter

+Ti=120; //Inside temperature //unit:fahrenheit

+To=70; //Outside temperature //unit:fahrenheit

+deltaT=Ti-To; //unit:fahrenheit //Change in temperature

+h=0.9; //Coefficient of heat transfer //Unit:Btu/(hr*ft^2*F)

+L=5; //Length //Unit:ft //From problem 11.10

+A=(%pi*D)*L;  //Area //Unit:ft^2 

+Q=h*A*deltaT; //The heat loss due to convection //Unit:Btu/hr //Newton's law of cooling

+printf("The heat loss due to convection is %f Btu/hr",Q);