# Heat Flux

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Heat flux, abbreviated as Q", also called thermal flux, is the heat flow rate transfer through a given surface, per unit surface.

## Heat Flux formula

 $$\large{ Q" = \frac { Q_f } { A } }$$

### Where:

 Units English Metric $$\large{ Q" }$$ = heat flux $$\large{\frac{Btu}{hr-ft^2}}$$ $$\large{\frac{W}{m^2}}$$ $$\large{ A }$$ = area $$\large{ft^2}$$ $$\large{m^2}$$ $$\large{ Q_f }$$ = heat flow rate $$\large{\frac{Btu}{hr}}$$ $$\large{W}$$

Tags: Heat Equations