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The Heat Sink

The Heat Sink. Heat Transfer Class Project Tim Bishop Nathan Packard Fall 2006. Introduction. Project was derived from summer internship at Moxtek in Orem, UT Involves basic conduction / convection through fins Wanted to mathematically SHOW what had previously been OBSERVED.

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The Heat Sink

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  1. The Heat Sink Heat Transfer Class Project Tim Bishop Nathan Packard Fall 2006

  2. Introduction • Project was derived from summer internship at Moxtek in Orem, UT • Involves basic conduction/convectionthrough fins • Wanted to mathematically SHOWwhat had previously been OBSERVED

  3. The Original Setup Assumed temperature of lights and base- 150 deg. F (72 deg. C )

  4. Introduction • Luxeons- -Popular type of LED- very bright • Run on about 350 mA and 12 volts • Will produce 35-40 lumens per watt- this is 5 to 20 time brighter then standard LEDs. These LEDs get VERY HOT! As mentioned in the online advertisement- “You must order a Heatsink, otherwise you must fix the LUXEON® to something that will draw the heat from the part.” **We decided on the latter!!**

  5. The Solution Assumed temperature of lights and base- 75 deg. F (24 deg. C ) Assuming h=5, 14.8 W are emitted!

  6. Analysis • Solution was a simple analysis of heat transfer from extended surfaces: • 2 large fins (9 x 5 x ½ inches) pure aluminum • 4 smaller fins (5 x 3 x ¼ inches) of alum. alloy • Small fan to increase h (assuming 25)

  7. Methodology • Used Figure 3.18 on page 138 of text to determine efficiency of fins • Knowing lengths, widths, k (237 for pure aluminum, 177 for alloy) and h (50) we found efficiencies of 0.83 (large) and 0.84 (small) • Plugging efficiencies into heat transfer equation, found the temperature difference to be about 19 deg. C. • Iteration lead to a temperature change of about 8 deg. C, which seems accurate!

  8. Resources • Moxtek Inc.- Special thanks to Michael Yost- Research and Development Engineer • http://www.fiberopticproducts.com/Luxeon.htm • ME 340 textbook

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