Heat storage
From Solar Cooking
(Redirected from Thermal storage)
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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. Much more heat can be stored in oil than in water since water can only be raised to 100° C without pressurizing it.
- 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.
[edit] See also
- July 2006: Solar Cooker for Evening / Night Cooking Using Solar Heat Storage Materials - Someshwer Dutt Sharma
- Wolfgang Scheffler has designed a heat storage system.
- Development and Testing of a Regenerative Rechargable Solar Stove System - Tewodros Eshetu, Shimeles Desalegn, and Dr. A.Venkata Ramayya
[edit] External links
- November 2009: Wolfgang Scheffler discussed thermal storage in an interview: "We did some samples. We did a small iron which we used in Portugal in some installations for many years. Because it's small, 50 kilograms of iron is just a few litres, you know, it's like six litres of iron, so it's quite small, so it still cools down a lot. Like when you have 450 degrees in the evening, in the morning you have 300 degrees. If you increase the mass of iron, like what you talked about, like 300, 400 kilograms, then that drop is only 50 degrees overnight. But then the next day you still have a lot of energy to cook and to use."[1]
- June 2008: Storing the Sun: Molten Salt Provides Highly Efficient Thermal Storage - Renewable Energy World
- April 2008: A new solar cooker that can even cook dinner - Business Standard
