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On vacuum the loss of heat it's very slow. But the gain of heat, from sun, it's quite fast.
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Radiant heat works the same both ways, but convection requires a transport medium.
A flat plate only needs to rotate 90°.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Necessity is the mother of invention, but simplicity is it's favorite aunt --Amish proverb
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