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The video only shows relatively small buildings - would that system work with high rise towers?

Not answering your main question, but the video shows relatively small buildings because that's what Berlin looks like[1]. High rise towers are not very common there.

[1] https://upload.wikimedia.org/wikipedia/commons/5/54/Berlin_P...

High towers have got the same land footprint, so yeah, it would work

Land footprint, yes, but they do have higher volume to surface ratios and that should play some role in heat absorption and dissipation I think.

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