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Else one could install it vertically, and put two rotating sleeves around it; each half transparent sheet arcrylic Fresnel lenses out of old big screen TVs. The other half insulated
One sleeve moves to follow the Solar cycle*, the other the day/night cycle. Turned against each other it's an insulated box.
The result is optimized gain and loss.
Edit: I think that's wrong. Would work if horizontal. One fixed, one rotating in either orientation?
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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