Heat Transfer CONDUCTION HEAT TRANSFER Solution: Q L 2p  (T_in T_o) ln r₂ r₁ k_s ln r₃ r₂ k_a 2p(550⁰F 100^oF) ln 6  in 5  in 12.5 Btu hr   ft   ^oF ln 9  in 6  in 0.14 Btu hr   ft   ^oF 971 Btu hr   ft Summary The important information in this chapter is summarized below. Conduction Heat Transfer Summary • Conduction heat transfer is the transfer of thermal energy by interactions between adjacent molecules of a material. • Fourier’s Law of Conduction can be used to solve for rectangular and cylindrical coordinate problems. • Heat flux ( ) is the heat transfer rate (    ) divided by the area (A). Q Q • Heat conductance problems can be solved using equivalent resistance formulas analogous to electrical circuit problems. Rev. 0 Page 17 HT-02