On Fri, 14 Jan 2005 23:09:53 GMT, "Rich" wrote:


wrote in message
...
I also suspect that swamp cooler cfms are inflated, as fans used to be.
Like an air conditioner you want to have one rated above what you need. I
run mine at the lowest speed most of the time. Only if the humidity rises
do I find it necessary to use high speeds.

Moving lots of air wastes water and electricity.
Why do you say that? They use relatively little water - only that which is
evaporated and a bit more if some is bled off.

A Las Vegas homeowner might do better with Sam's portable 797895 Arctic
Breeze
cooler mounted inside a house near an open low window and
an exhaust fan in a higher window with a one-way plastic film damper.
You can't recycle the air in the house. You have to get rid of the moist
air as it will not cool.

house temp reaches 80 F and turn on the exhaust fan when the RH reaches
60% to keep the house air at the upper right corner (80 F and w = 0.012)
of the ASHRAE 55-2004 comfort zone.
Your house would be like a steam bath. The maximum cooling is when the
humidity is very low. Once it gets to 30% cooling becomes marginal.


Keeping that house 80 F while evaporating P lb/h of water into C cfm of
outdoor air means 1000P = (91.1-80)(128+C). P = 60C(0.075)(0.012-0.0066)
= 0.0243C makes C = 108 cfm and P = 2.62 lb/h, ie 7.6 gallons per day.
If the house has significant thermal mass (eg a floorslab), we can save
more water and energy by only running the cooler at night.

Why do we need 5000 cfm???

I think you need to live in the South West deserts for a summer and try
cooling with a swamp cooler. You soon find out why most houses have
refrigeration if they can afford it.


If you insist on continuing to bother Nick with facts and
realities, he's gonna have another allergic reaction and swell all up
and everything.

Nick thinks the range of human comfort is defined by the
highest setting available on your refrigerator, and the lowest setting
available on your stove.

Everything in between can be explained away with his little
magic formulas.



Paul ( pjm @ pobox . com ) - remove spaces to email me
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