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Originally Posted by roger1818
Not adequate shade in the underground stations???
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Did I say that?
No?
Then carry on.
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I assume you accidentally deleted the wrong part of my original post and are referring to the other stations.
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no, just that the quote feature doesn't re-quote already-quoted material. Don't be so defensive.
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I don't disagree with you, but also don't think they will be much different than the greenhouses for stations we currently (previously) have. If the glass has a spectrally selective glazing that reflects IR light, the shading may not be as bad as we are assuming. Typically they aren't used here though, as in the winter we want that IR light for natural heating.
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The current greenhouses are utter misery in the summer.
In the winter, the sun is at a lower angle. Your passive IR heating comes in through the sides more so than the roof. If shade and protection from summer heat is at all a design value, then the rooves, for summer purposes, must be opaque.