Passive cooling depends on three main ‰gheat sinks‰h
The sky
Especially effective on clear nights,
when sky radiant temperature can be
well below air temperature
The air
Our most common heat sink,
especially effective when air is very dry
(low relative humidity) and with breezes
The earth
If far enough below the surface, a year-
round average temperature often is
well below hot weather air temperature
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