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re: heres an idea for alternative air conditioning...
10 jun 2000
db tech wrote:
>...[with] a water cooled freon condensing unit, as opposed to water
>cooled air. i would think that twenty btu's per watt hour could be
>attained.
the best i've heard of is lennox's 14 seer, ie 4.1 w/w. compare this to
a 1/25 hp grundfos pump pushing 5 gpm of 55 f water through 4 magicaire
800 btu/h-f coils in the airpath of a 100 w 25k cfm ceiling fan--about
(80f-55f)3200btu/h-f = 80k btu/h or 23.4 kw of coolth using about 150 w
of electrical power, ie 156 w/w, ie a cop of 156 or a seer of 532, 38
times more efficient than freon, even without condensation.
>the problem with a direct water cooled air system is the
>potential of not having a low enough temperature of water flow
>through the coil for dehumidifying...
another problem is rust.
>...if the exit air temperature is above the dew-point then
>there is no dehumidifying.
there's no dehumidification if the coil is warmer than the dew point
of the air near the coil. the exit air might be a lot warmer.
>the other factor here is that the coil itself must be of good
>design, which would mean a very large unit with, as you said, a
>slow moving column of air across the coil.
i didn't mention slow-moving air. my $35 used 1984 dodge omni auto
radiator with its attached 12 v fan keeps my house about 80 f on a
100 f day with condensation, using about 2 gpm of 55 f wellwater.
nick
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