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+clear;
+clc;
+printf("\t\t\tExample Number 1.2\n\n\n");
+// heat loss through a glass window
+// illustration1.2
+// solution
+
+L = 0.015; // [m]Thickness of glass window
+dT = 20-(-5);//[degree celsius] temperature difference
+
+A= 0.5;//[m^2] surface area of the glass window
+//calculating rate of heat flow across the brick wall
+k=0.78;//[W/m degree celcius] thermal conductivity of the glass window
+q = (k*A*dT)/(1000*L);//[kW] rate of heat loss
+t=2;//[h] time in hours
+H=q*t;//[kW.h] total heat loss in time t
+printf("Total heat loss across the glass window in 2 hours is %f kW.H",H);