[VAC] Re: Generators running A/C; swamp coolers (was: Jill's find & solar cost)

[Dr. Gerald N. Johnson, electrical engineer]

Swamp coolers do lower the air temperature. It takes heat from the air
to evaporate the water. They also raise the humidity of the cooled air.
In very large installations, using city water, the fact that the water
comes from the waterline cooler than the air also adds cooling. There is
an old theatre in Story City Iowa that cools that way. Though generally
smaller swamp coolers are not effective in this climate that tends
towards being humid. Too much swamp cooler action anywhere can lead to
lots of mold growth inside.

Most all motors require several times their normal running current when
starting. The motors commonly used for compressors, take 5 or 6 times
running current for starting. And that peak current is what has to set
the generator (or inverter) size. When running from alternative energy
sources, motor and equipment designs that minimize that starting current
would enhance the overall efficiency of the energy source.

In the extreme boon docking situation, its not like home in the city.
First there can be open breezes, second there's not necessarily the
blacktop to hold heat, and what's the benefit of being away from home if
one has to hole up in the A/S to hide from sun and heat? One might get
greater benefit from the scenery by wearing loose fitting light color
clothes (long loose sleeves) to reflect the sun, wide brimmed hats,
sunblock and be outside and become accustomed to the warmth. A bit of
shade even if only a wide hat brim can do a lot.

Gerald J.



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