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Using a solar oven as a radiant refrigerator at night

solarcooking.org

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Re: Using a solar oven as a radiant refrigerator at night

#91

Post by cchance »

contemporary343 wrote: post #25

If you insulate it in vacuum with an IR transparent window (unfortunately $$$) you can get substantially cooler than ambient: https://www.nature.com/articles/ncomms13729

Theres videos on youtube by a dude that does Science experiments at home making radiant paint from common stuff, it's really good and easy to use and shows solid reductions below ambient.

Re: Using a solar oven as a radiant refrigerator at night

#92

Post by K0balt »

Enginerrrd wrote: post #81
mamediz wrote: post #78

Earlier quoted context omitted.

Yes, I like this explanation, when that phenomenon happened in our house I thought one of our neighbours was dumb because he just put a blanket over the collector on the roof, as he said, "to keep it warm". But now I think he was right. Now, I don't know if this exists but it would be nice if there was a kind of glass that let radiation pass only to one side and not the other way, a kind of "valve", this could solve…

>Now, I don't know if this exists but it would be nice if there was a kind of glass that let radiation pass only to one side and not the other way, a kind of "valve", this could solve the problem of water frozing from radiation in our solar heating. This doesn't exist and can't even in principle because it would be a fundamental violation of thermodynamics. Basically, it would be a Maxwell's demon for radiation that…

I don’t think maxwells demon is impossible, it just is a device for converting información to energy. In theory, many such devices may be possible for the conversion of information to both energy and matter. This seems like it might be support the simulation hypothesis.

Re: Using a solar oven as a radiant refrigerator at night

#94

Post by kbutler »

Enginerrrd wrote: post #81
mamediz wrote: post #78

Earlier quoted context omitted.

Yes, I like this explanation, when that phenomenon happened in our house I thought one of our neighbours was dumb because he just put a blanket over the collector on the roof, as he said, "to keep it warm". But now I think he was right. Now, I don't know if this exists but it would be nice if there was a kind of glass that let radiation pass only to one side and not the other way, a kind of "valve", this could solve…

>Now, I don't know if this exists but it would be nice if there was a kind of glass that let radiation pass only to one side and not the other way, a kind of "valve", this could solve the problem of water frozing from radiation in our solar heating. This doesn't exist and can't even in principle because it would be a fundamental violation of thermodynamics. Basically, it would be a Maxwell's demon for radiation that…

We call this a one-way mirror.

https://en.m.wikipedia.org/wiki/One-way_mirror

They are not perfect (intensity & wavelength limitations), but they exist.

See also mirages and total internal reflection.

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