Transfer of heat from one place to another due to the molecular movement of fluids (Air or liquid) is known as convection heat transfer. When molecules move from one place to another they carry heat with them. You can use this calculator to calculate the convective heat transfer. We suggest you to read this article to know in detail about convective heat transfer.

Formula For Convective Heat Transfer

Rate of convective heat transfer is directly proportional to heat transfer surface area, convective heat transfer coefficient and temperature difference.

Convection Heat transfer (Qv) = hc A dT


Qv = Convective heat transfer per unit time in Watt

A = heat transfer area in square meter

hc= Convective Heat Transfer Coefficient (W/square m K)

dT = Temperature Difference

Convective Heat Transfer coefficient Calculations

Value of convective heat transfer coefficient depends on air speed. You can use the below formula to calculate convective heat transfer coefficient for air velocity range from 2 m/sec to 20 m/sec. 

Convective Heat Transfer coefficient Values for air:

Natural Convection =  5 – 25 W/m2 K

Forced Convection =  10 – 200 W/ m2 K

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