Use the direct method to derive the element equations for the one-dimensional steady-state conduction heat-transfer problem shown in Figure P13-17. The bar is insulated all around and has cross-sectional area A, length L, and thermal conductivity Kxx. Determine the relationship between nodal temperatures t1 and t2 (oF) and the thermal inputs F1 and F2 (in Btu). Use Fourier's law of heat conduction for this case.
Figure P13-17

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F2. 12 1, F1 L- 2.