# Heat Transfer 3

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 Author: RJVan ID: 308267 Filename: Heat Transfer 3 Updated: 2016-03-17 17:35:22 Tags: heat exchanger conduction convection radiation Folders: Mechanical Engineering Description: Mechanical Professional Engineering Exam Review Show Answers:

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1. What are the units for thermal conductivity (k)?
2. What are the units for film coefficient (h)?
3. What are the units for heat transfer coefficient (U)?
4. What are the units for thermal resistance (Rth)?
5. What is the equation for heat transfer through a flat plate?
6. What is the equation for total heat transfer coefficient?

7. What limitations are there on Newton's Method for solving transient heat conduction?

• You need a starter value of Tt so you can calculate a starting value of r or t
8. What do you need to know to use the Lumped Parameter method for solving transient heat conduction?
• The Biot number must be less than 0.10.
• To calculate the Biot and Fourier numbers, the characteristic length (Lc) of a cylindrical object is half its radius.
9. What is the Stefan- Boltzmann constant, and how is it used to calculate emissive power?

10. What do you need to know to use the Lumped Parameter electrical analogy for solving transient heat conduction?
The time constant

is the time it takes for the temperature to be reduced to 36.8% of its original value.
11. What is the equation to compute gray body radiation?
•
• where

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