Heat Transfer


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Brief presentation on Heat Transfer

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Heat Transfer

  1. 1. Heat Transfer Conduction, Convection and Radiation<br />Instructor: Kristen Adams<br />Course: Physics 202<br />LFCC<br />
  2. 2. Facts About Heat Transfer<br />Heat is always transferred from HOT to COLD<br />Heat is never transferred from COLD to HOT<br />There are three different ways that heat is transferred: <br />conduction, convection and radiation<br />
  3. 3. Conduction<br />Metals are good conductors of heat<br />Non-metals are good insulators<br />
  4. 4. ConductionHeat is transferred through collisions between molecules<br />
  5. 5. Convection<br />Occurs primarily in liquids and gases (fluids)<br />Heat is transferred by movement of material<br />
  6. 6. RadiationHeat is transferred by electromagnetic waves <br />
  7. 7. QuestionIn the picture below are three hands, I’ll call them left, top and right.Which hand is experiencing heat transfer through-conduction ?-convection ?-radiation ?<br />
  8. 8. Sources<br />Illustration: “heat conduction in a crystal”; attributed to Cdang; some rights reserved under the CC license Attribution ShareAlike 3.0 http://commons.wikimedia.org/wiki/User:Cdang/Gallerie_d%27images/Thermodynamics_and_chemistry <br />Illustration: “convection_cells”; attributed to theresaknott (original), Joanjoc version without text; some rights reserved under the CC license Attribution ShareAlike 3.0; commons.wikimedia.org/wiki/File:Convection_ce...<br />Photo: the sun with prominence; public domain; http://nasaimages.org<br />Photo: “radiation, convection, conduction”; attributed to Waifer X, some rights reserved under the CC license Attribution 2.0 Generic; http://www.flickr.com/photos/waiferx/2721036539/<br />