Engineers Edge Heat Flux Thermodynamics - Engineers Edge
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Heat Flux

Thermodynamics Directory | Heat Transfer Directory

The rate at which heat is transferred is represented by the symbol Q. Common units for heat transfer rate is Btu/hr. Sometimes it is important to determine the heat transfer rate per unit area, or heat flux, which has the symbol Q" . Units for heat flux are Btu/hr-ft2. The heat flux can be determined by dividing the heat transfer rate by the area through which the heat is being transferred.˙

Q " = Q/A

where:

Q"    = heat flux (Btu/hr-ft2)

Q     = heat transfer rate (Btu/hr)

A     = area (ft2)

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