Heat Flow Rate

Written by Jerry Ratzlaff on . Posted in Thermodynamics

The rate at which heat moves from an area of higher temperature to an area of lower temperature.  Btu/hr (W/hr). Heat flow is generally used to quantify the rate of total heat gain or heat loss of a system.


\(Q_t = -\lambda  \left( \frac {A} {l} \right)   { \left( \Delta T \right) } \) 


\(Q_t\) = heat transfer rate

\(\lambda\) = thermal conductivity

\(A\) = area of the emitting body

\(l\) = length of the material

\(\Delta T\) = temperature differential


Tags: Equations for Heat Equations for Flow Rate