Heat Transfer CONVECTION HEAT TRANSFERRecalling Equation 2-3:QUoAoDTowhere Uo is defined in Figure 6.An example of this concept applied to cylindrical geometry is illustrated by Figure 7, whichshows a typical combined heat transfer situation.Figure 7 Combined Heat TransferUsing the figure representing flow in a pipe, heat transfer by convection occurs betweentemperatures T1 and T2; heat transfer by conduction occurs between temperatures T2 and T3; andheat transfer occurs by convection between temperatures T3 and T4. Thus, there are threeprocesses involved. Each has an associated heat transfer coefficient, cross-sectional area for heattransfer, and temperature difference. The basic relationships for these three processes can beexpressed using Equations 2-5 and 2-9.Qh1A1 (T1T2 )Rev. 0 Page 21 HT-02
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