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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.
2-144 Consider a steam pipe of length L 10 m, inner ra- dius η = 5 cm, outer radius r? = 6 cm, and thermal conduc-
tivity k 14 W/m °C. Steam is flowing through the pi an average temperature of 120°C, and the average c heat transfer coefficient on the inner surface is given to be h 85 Wm2C. If the average temperature on the outer surfaces the pipe is T-70°C, (a) express the differential equation and the boundary conditions for steady one-dimensional heat con- duction through the pipe, (b) obtain a relation for the variation of temperature in the pipe by solving the differential equation, and (c) evaluate the rate of heat loss from the steam through the pipe Pipe at T,-70°C Steam 120 C FIGURE P2-144 2-145 W
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