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re: how much water do high-efficiency furnaces need to drain?
9 aug 2005
wrote:
>on a typical winter day for those living in cold climates, how much
>water (condensation) is produced by a high-efficiency furnace per day?
you might figure about 5% of the fuel's heating value for oil, ie
0.05x140kbtu/1000 = 7 pounds per gallon, eg 42 lb/day of water, if
you burn 6 gal/day of oil, and about twice that for natural gas.
>and would this amount to more or less than what is produced by a
>central air conditioner?
depends on the humidity and house air leakage rate. if wi = 0.00787
(80 f at 50% rh) inside and wa = 0.0130 (phila in july) and a 2400 ft^2
house leaks 224 cfm (a 0.7 ach average), the ac needs to remove at least
24hx60x224x0.075(wa-wi) = 124 pounds of water per day.
nick
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