Question by haileysolange: What would be a good “heat sinker” or heat absorber for a solar oven?
Right now my solar oven is at about 150 degrees farenheit, but I want it to be hotter. I put a brick in my solar oven to absorb the heat and keep it in, but it didn’t work. Any suggestions?
Best answer:
Answer by Ryan
Maybe if you changed the oven’s interior to something that absorbs less heat. I’m not sure what a good material would be, but the thicker the better I would assume.
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5 users commented in " Solar Oven – What would be a good “heat sinker” or heat absorber for a solar oven? "
Follow-up comment rss or Leave a TrackbackSomething black, I would think. It would absorb the infrared rays from the sun, and then emit them as a blackbody radiation source later.
A black-finned steel container with liquid sodium or other good interior material might be good.
There are 65 specific designs for solar ovens. You need to make your design adjustable. First you need to know how hot they can be and then how hot you want it. Then you can make an adjustable design that fits the parameters. For example 100-200 degrees F.
Getting the highest possible temperature from a solar oven is a race between heat gain and heat loss. You can work on both aspects. For instance, you can reduce heat loss by putting the equivalent of a thermopane window in front of it by spacing two or three layers of saran or other transparent film to let light in but slow heat escaping that way.
You can also improve the thermal insulation on the shaded side of the oven to reduce heat loss that way.
A lot of what you might do depends on the design details of your oven. For instance, focussed designs benefit more from adding insulation and thermopane very close to the absorber structure, instead of out at the front and back of the focusing structure.
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Regards,
John Popelish
cast iron cookware. great when aluminum or copper cookware breaks in a open fire, etc.
cast iron absorbs and hold that heat in well.
very durable
they’re also real heavy, so get oven mitts if you want to move the cookware item, one hand can lead to wrist injury. and make sure your stand and withstand a pot up to 30 lbs (a aluminum wok: 14 ounces. a cast iron frying pan: 10lbs)
cast iron can rust, so watch for that too.
finally, add more reflective materials in your oven so it can better focus or redirect the heat.
First of all what is your oven made of? If you don’t have the interior painted black you need to do that. A brick may absorb heat but it won’t trap it like you want. Is the oven insulated? Think about that. A glass lid will help hold in the heat as well.The oven itself should be your “heatsink”.
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