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re: efficient humidifiers
18 feb 2002
clark damron wrote:
>i am planning to build a house way up in the rockies and i will need to
>keep fairly rigid control of the humidity. does anyone know of an
>efficient humidifier or system that is available that wouldn't be too
>much of a drain on a pv system?
people and their activities (showers, cooking, cleaning, etc) release
about 4 pounds of water vapor per person per day. you might attach a
fountain pump to a humidistat or blow some air through a terrarium for
more humidity.
>the house will be a fairly tight 1500 sq. ft. straw bale construction...
if the natural air leakage rate is a air changes per hour, 24a1500x8
= 288ka ft^3 or 21.6ka pounds of air flow through the house every day. at
70 f and 50% rh, vapor pressure pa = 0.5exp(17.863-9621/(460+70)) = 0.374
"hg and humidity ratio w = 0.62198/(29.921/pa-1) = 0.00787 pounds of water
per pound of dry air, so making 21.6ka pounds of perfectly dry (0% rh)
outdoor air 50% rh requires adding 21.6kaw = 170a pounds/day of water
vapor, ie a < 0.047 ach (9.4 cfm) with 2 people inside. "fairly tight..."
nick
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