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me 302engineering heat transfer steps for solving heat transfer problems...

Question: me 302engineering heat transfer steps for solving heat transfer problems...

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ME 302-ENGINEERING HEAT TRANSFER Steps for Solving Heat Transfer Problems I. Problem Statement/Solution: Briefly state what is known about the problem in your own words, give the key information and state what is required to be determined. This ensures that you understand the problem and what is to be solved 2. Diagram: Sketch the physical system and identify relevant heat transfer processes and mass transfer interactions. Also list the relevant given information. Look for possible properties, which remain constant during a process and identify them on the sketch. 3. List the assumptions and any approximations made to make it possible for the problem to be solved. Note that some of the assumptions may be given in the problem Properties: The properties necessary for the solution of the problem should be determined. Most of the unknown properties can be obtained from tables and charts in the Appendix at the back of the textbook. Analysis or Calculations: Begin to solve the problem by applying the relevant energy conservation, conduction, convection and radiation equations. By using the assumptions made, these equations can be reduced to simpler equations. Solve as far as possible before substituting numerical values. Retain the digits in the given data during the calculations and round up the results or answer to appropriate number of significant digits. 5. If required or necessary,discuss your results to include key reasoning. conclusions and scope or effects of your assumptions.

2-157 A plane wall of thickness L is subjected to convec- tion at both surfaces with ambient temperature Ts and heat transfer coefficient hy at inner surface, and corresponding T2 and h2 values at the outer surface. Taking the positive direction of x to be from the inner surface to the outer sur- face, the correct expression for the convection boundary condition is dT(0) (b) k dT(0) (c) -k (e) None of them 2-159

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