Question

Is there a specific formula in case there was a known heat loss given by the equation q=h(T1-T2), where h=a w/m2.K and then the speed of the airstream changed and h=became h1=a+ 70 w/m2.K?

Answer 1

No, there is no specific formula for this case. Actually, it is the same case as previous one, only the value of heat transfer coefficient(h) has been changed. General formula to determine the heat loss due to convection is given by:-

Q = hA(T₁ – T₂)

Where, Q = heat transfer

                A = area of surface

                T₁ and T₂ are temperature at different locations between which heat is transferred.

q = h(T₂ – T₁)

here, q = heat transfer per unit area.

If the value of “h” has been changed, then replace the new value of “h”(that is h₁) in above formula and you will get the answer. Thus in this case heat transfer is equal to

q = (a+70)(T₁ – T₂).