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No, that is 'space utilization'. Nothing to do with energy efficiency, which includes external energy absorption, as well as dissipation.
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Not sure what I was getting at, but it was about housing. The toroidal airflow inside a hemisphere is all about energy conservation. As you say the sphere has minimal surface area. The external airflow is also optimal with a compound curve and minimal surface texture.
Do you have the Cd for an icosahedron
vs sphere?