A closely related process, sublimation cooling differs from evaporative cooler in
that a phase transition from solid to vapor, rather than liquid to vapor
occurs.
Sublimation cooling has been observed to operate on a
planetary scale on the planetoid pluto, where it has
been called an anti-greenhouse effect.
Another application of a phase change to cooling is
the "self-refrigerating" beverage can. A separate compartment inside
the can contains adesiccant and
a liquid. Just before drinking, a tab is pulled so that the desiccant comes
into contact with the liquid and dissolves. As it does so it absorbs an amount
of heat energy called the latent heat of fusion. Swamp cooler works with the phase change of liquid into vapor and the latent heat of vaporization, but the
self-cooling can uses a change from solid to liquid, and the latent heat of
fusion to achieve the same result.
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| Swamp cooler |
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