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Heat Sink Calculator

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Heat Sink Calculator Powered By Docstoc
					   Jed Goodell
Jesse Williams
Introduction
 Problem
    How much heat does a particular heat sink dissipate
    How many fins are needed to dissipate a specific amount
     of heat
 Objective
    To create a Heat Sink calculator that can:
       Determine heat dissipation for a given number of fins
       Determine number of fins for a given heat dissipation
Multiple Problems:
 Solved problem in Excel
 Compared with Output
 Forced Convection
    Laminar Flow
        Aluminum, Copper, and Steel
          Solve for Heat Dissipation
          Solve for Number of Fins

    Turbulent Flow
      Aluminum, Copper, and Steel
         Solve for Heat Dissipation
         Solve for Number of Fins

 Free Convection
    Aluminum, Copper, and Steel
        Solve for Heat Dissipation
        Solve for Number of Fins
Equations Used:
  Test Problem
 Inputs:
    Type of flow: Laminar
    Material: Aluminum
    Base Thickness: 0.008 m
    Fin Length = 0.01 m
    Fin Width = 0.005 m
    Fin Depth = 0.1 m
    Base Temperature = 323 K
    Air Temperature = 300 K
    Wind Velocity = 3 m/s
    Number of Fins = 17 / Needed Heat Dissipation = 30 W
Results
When solving for Q
 30 W (7mm spacing)
When solving for number of fins
 17 Fins
For Free Convection
 19 W (19mm spacing)

Calculator also Displays
 Total Surface Area
 Fin Efficiency
 Overall Efficiency
 Optimum Fin Spacing
 Average Convective Coefficient
Calculator
 http://students.cs.byu.edu/~jgoodell/heatsink.html
Conclusions
 Material does not significantly affect the number of
  fins or heat dissipation.
 Surface and air temperatures, air velocity, and number
  of fins significantly affect heat dissipation.
 Surface and air temperatures, air velocity, and heat
  dissipation significantly affect the number of fins.
References
 Fundamentals of Heat and Mass Transfer,
 Incropera et al.
   Chapters 7 & 9
   Material/Air properties poly-fit from Appendix A


 Title picture from Wikipedia, ‘Heat Sink’

				
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posted:11/23/2011
language:English
pages:9