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re: low cost house cooling techniques?
18 jan 1998
leroy wolff wrote:
>jonathan grobe wrote in article
>> any suggestions on low cost summertime house cooling techniques (not
>> air conditioning)? i live in a moderately old house in iowa...
>take the radiator out of an old car or truck.
sounds good. might take the attached 12v electric fan too, as in a $35 used
1984 dodge omni radiator with attached 12 v fan. i tried one in my living
room floor with about 2 gpm of water flowing through it. a radiator and fan
might have a thermal conductance on the order of 1000 btu/h-f.
>mount it on the window of your upstairs room.
or leave the windows closed and mount it inside the room, so it can
make the room air cooler and dryer, vs continuously cooling and
dehumidifying outside air.
>...hook a garden hose to your radiator so the water flows into the bottom
>connection and out the top. from the top connection run a garden hose down
>to your yard.
sounds good.
>you will have to be watering your lawn round the clock for this
>system to work.
sounds like a lot of water consumption. how about circulating water from
an outdoor shaded "cool pool" on the north side of the house? the 24 hour
average temperature in des moines in july is 76.6 f, with average daily
min and max of 66.5 and 86.7. the average humidity ratio in july is
0.0134 pounds of water per pound of dry air, which corresponds to a dew
point of about 65 f, ie that might be the pond water temp if it weren't
cooling the house at all.
if it were, and the water temp were say, 75 f, a square foot of pond might
lose (75-70)1.5 = 7.5 btu/h-f by convection and 1000(0.88-0.74)/(75-70)
= 28 times more heat by evaporation, a total of 218 btu/h, so an 8'x12'
pond might lose 21k btu/h on an average july night, equivalent to
about 4 window air conditioners going full blast...
nick
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