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Solar Refrigerators David Ragan

Solar Refrigerators David Ragan. The Need. Prevent food from spoiling Reduce food-borne diseases Store crops for sale at a later date Store vaccines. Varieties. There are two different types of solar refrigerators. Type 1

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Solar Refrigerators David Ragan

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  1. Solar RefrigeratorsDavid Ragan

  2. The Need • Prevent food from spoiling • Reduce food-borne diseases • Store crops for sale at a later date • Store vaccines

  3. Varieties • There are two different types of solar refrigerators. • Type 1 • Developed by NASA, uses solar panels to power a normal refrigerator . • Type 2 • Developed by Emily Cummins, uses evaporation to cool items.

  4. How It Works • Type 1 • Uses the sun’s energy to create free electrons and holes in a semiconductor material causing current. • This current is used to power a normal refrigerator. • Coolant is compressed , cools, condenses, expands, and vaporizes cooling the coils. • Solar Cells are expensive.

  5. How It Works • Type 2 • Consists of cylinder inside another with water soaked organic material in-between. • Outer cylinder is composed of any material with holes to let the sun through. • Inner cylinder is made of metal. • As organic material heats up the water evaporates, removing heat from the metal cylinder. • CHEAP!!! SIMPLE!!!

  6. How It Works

  7. Needs/Abilities • Type 1 • Can cool contents to 38 degrees Fahrenheit • Can use stored power to maintain temperature for a week without sunlight • Needs 5 hours of sunlight per day • Type 2 • No moving parts • Can cool contents to 43 degrees Fahrenheit • Needs lots of sun to work • CHEAP!!!!

  8. Who Needs Them? • Places that do not have a ready supply of electricity • Poorer Countries • Research Stations • Street Vender Food Carts • Hunting Lodges

  9. Works Cited • http://www.solarpowerwindenergy.org/2009/02/04/student-invents-solar-powered-fridge-for-developing-countries/ • http://home.howstuffworks.com/solar-powered-refrigerator1.htm

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