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+clear;

+clc;

+printf("\t\t\tExample Number 3.2\n\n\n");

+// cubical furnace

+// illustration3.2

+// solution

+

+a = 0.5;// [m] length of side of cubical furnace

+Ti = 500;// [degree celsius] inside furnace temperature

+To = 50;// [degree celsius] outside temperature

+k = 1.04;// [W/m per degree celsius] thermal conductivity of fireclay brick 

+t = 0.10;// [m] wall thickness

+A = a*a;// [square meter] area of one face 

+// we compute the total shape factor by adding the shape factors for the walls, edges and corners

+Sw = A/t;// [m] shape factor for wall

+Se = 0.54*a;// [m] shape factor for edges

+Sc = 0.15*t;// [m] shape factor for corners

+// there are six wall sections, twelve edges and eight corners, so the total shape factor S is

+S = 6*Sw+12*Se+8*Sc;// [m]

+// the heat flow is calculated as 

+q = k*S*(Ti-To);// [W]

+printf("heat lost through the walls is %f kW",q/1000);