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//Variable declaration:
k = 0.022 //Thermal conductivity of glass wool (Btu/h.ft. F)
T1 = 400 //Inside wall temperature ( F)
T2 = 25 //Outside wall temperature ( C)
L = 3/12 //Length of insulation cover (ft)
//Calculation:
T_2 = T2*(9/5)+32 //Outside wall temperature in fahrenheit scale ( F)
QbyA = k*(T1-T_2)/L //Heat flux across the wall (Btu/h.ft^2)
//Result:
printf("The heat flux across the wall is : %.1f Btu/h.ft^2 .",QbyA)
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