The rate at which heat is transferred is
represented by the symbol Q . Common units for heat ˙Q
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 
.
Units for heat flux are Btu/hr-ft2.
The heat flux can be ˙Q determined
by dividing the heat transfer rate by the area through which
the heat is being transferred.
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