| 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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