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re: dehumidifier 15 nov 2004 dogsnus@micron.net wrote: >> rh works if the outdoor temp is lower. otherwise, use absolute humidity, >> ie ventilate when wo < wi, ie ln(ro/ri) < 9621(1/(460+to)-1/(460+ti)). >> for example, if it's 70 f and 80% indoors and 80 f outdoors, ventilate >> when ro < 0.8e^-0.336 = 0.57, ie the outdoor rh is less than 57%. > >i could kiss you for posting this formula. that sounds nice :-) >i don't wish to unpack my textbooks, couldn't remember it, >and got a way_ too complex formula when i googled... assuming wo < wi, ie 0.62198/(29.921/po-1) < 0.62198/(29.921/pi-1), with p in "hg, and 1/(29.921/po-1) < 1/(29.921/pi-1), and 29.921/pi-1 < 29.921/po-1, and 29.921/pi < 29.921/po, and 1/pi < 1/po, and po < pi. now, psat = e^(17.863-9621/t) "hg, with t in degrees rankine and a clausius-clapeyron approximation (caryn understands this), so roe^(17.863-9621/(460+to)) < rie^(17.863-9621/(460+ti)), and roe^(-9621/(460+to)) < rie^(-9621/(460+ti)), and ln(ro) -9621/(460+to) < ln(ri) -9621/(460+ti), and ln(ro/ri) < 9621/(1/(460+to)-1/(460+ti)). qed. nick ----- the following addresses had permanent fatal errors ----- |