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Heat Sink Calculator

Heat Sink Calculator. 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:

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Heat Sink Calculator

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  1. Heat Sink Calculator Jed Goodell Jesse Williams

  2. 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

  3. 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

  4. Equations Used:

  5. 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

  6. 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

  7. Calculator • http://students.cs.byu.edu/~jgoodell/heatsink.html

  8. 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.

  9. 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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