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re: dehumidify basement?
14 may 2002
max wrote:
>an electric dehumidifier will yank between 30 and 65(!) pints/day from
>the air. power consumption isn't as high as you _might_ think, but it's
>definitely up there.
i measured a new efficient dehumidifier as a heat pump. it produced
1.6 kwh of heat for every kwh consumed, ie 1 kwh from the motor plus
0.6 kwh to condense about 2 pints of water, ie it consumes 0.5 kwh per
pound of water, eg 15 kwh for 30 pints/day, $1.50/day at 10 cents/kwh.
>the second best technique would be to open basement windows and run a
>fan or set up a fan+duct arrangement to exchange drier air from out of
>doors. this will definitely work -- "almost" as well as a dehumidifier,
>on nice dry days...
a 70 f basement with 60% rh and humidity ratio w = 0.00947 pounds of water
per pound of dry air. air with a 50 f dewpoint has w = 0.00787, so a 36 w
560 cfm fan could remove 24x60x560x0.075(0.00947-0.00787) = 97 pints in 24
hours, at a cost of $0.1x24x36/1000 = 8.6 cents, ie 0.089 cents/pint, 1/56th
the cost of the dehumidifier. it would be nice to have an automatic way
to control the fan.
nick
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