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Heat storage

From Solar Cooking

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Heat storage is fairly self-descriptive. It is used:

  • So that cooking may be done at night
  • So that cooking may continue if the sun goes behind clouds
  • So that the cooker's temperature does not drop too much when cold food is added
  • So that one doesn't have to "worry" about the above

It can be done by means of:

  • Sensible heat storage. This means holding heat in a material without changing its phase when heat is added or removed. Rocks and bricks may become hot, but remain solid. Oil may become hot, but remains liquid.
  • Latent heat storage. This is usually accomplished by using solar heat to melt a special material, and then when the heat is needed it is drawn from said material. As it re-solidifies, it releases this heat. A very large amount of heat is stored this way, and the temperature during melting or solidification remains constant. The material must melt at a "reasonable" temperature, hot enough to begin and complete the cooking of food, but also low enough to be attainable using solar energy. It must also be reasonably non-toxic, stable, easy to work with, and of course affordable. Erythritol and citric acid may be candidates.

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