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AZGuy wrote:

What you can't seem to understand is that your formulaes mean nothing
if they don't result in the same outcome as occurs in the real world.

I'm not aware that anyone's tried this yet. Seems easy enough. Why don't
you?

This is done to some extent all over the southwest. They sell those
portable coolers everywhere as they are often used to cool one room. A
family member had one for a while. It was worthless when sitting in the
middle of the room. They would exhaust air with a fan but the cooling was
minimal. Finally they devised a way to mount it by a window so they could
use only dry outside air. Even then it was good for only a few feet near
the cooler. Another problem is the intensity of the sun. Just a few years
ago I was in Maryland during the hottest part of the day. I noted that my
car air conditioner worked better there than it did in the Southwest. The
difference being that the suns rays were so much more intense in the SW. I
was doing something in the sun so I moved into the shade. It did not make
any difference. The surface and interior of the car stayed much cooler
there than in the SW. I have had tires rot from the heat before they wore
out.

In the SW the sun is so intense you can burn in a few minutes (Thus Cowboys
with their wide brimmed hats and long sleeves). In the SW it can be like an
inferno in the sun but quite comfortable in the shade.

This also reminds me of a story about a friend from Europe who was on his
way to Los Angles. He was traveling by train and got off at Albuquerque.
he said he went around asking if it got that hot in California. He had
never experience heat that intense.


People who use evap coolers know how much CFM is needed to be
comfortable on a 110 degree day with humidity of 20%.

How much, for a house with a 128 Btu/h-F conductance?

You are also using a rather small house for an example. Maybe that is the
problem as most people in the Southwest live in houses twice the size you
are using for an example. Most have slab floors.


You're like the theorist who can "prove" that bees can't fly.
That guys theory was inadequate, just as yours seems to be.

Shades of Harry Thomason. See "Solar Heat in Snow Country" at
http://www.ece.villanova.edu/~nick

Nothing unusual there. Perhaps only that he is using trickling water
instead of a network of pipes, but he still has 700 sq. feet of collector.
They can be about 80% efficient. During the energy shortage of the 70s
solar heat was very popular in Colorado where the sun is quite a bit more
intense and more available (very few cloudy days) than in the northern part
of the country. Now most of those units have been abandoned. They are
effective when replacing electric heat. At present prices it is still
cheaper to heat with natural gas.

A plastic cover on a swimming pool will very rapidly result in a pool that
is too hot. Some heat their pools by running their filter water through
some black irrigation pipe on a patio roof.

But those have nothing to do with cooling by evaporating water.

One place where I worked the temperature often got to as high as 120
degrees. When those temperatures occurred the humidity was often about 2%.
At 90 degrees the humidity would normally be about 20%. They had three
large ponds between the buildings with multiple heads spraying water into
the air. Surrounded by grass it was quite pretty. The ponds were actually
cooling ponds for the buildings refrigeration units. Initially the heads
were about a foot above the pond surface. The freon began to get too warm
so they raised the heads about six feet to get more evaporation. Later they
added another ponds.