```re: solar assisted a / c 12 sep 2005 drew cutter wrote: > i understand that dehumidifiers will be hard to come by because of > katrina. demand for these have gone way up. solar-assisted fans might work faster with less electrical energy. nrel says 1550 btu/ft^2 of sun falls on the ground on an average 78.1 f september day in new orleans, with an 86.1 daily max and humidity ratio wa = 0.0158 pounds of water per pound of dry air. with 8 hours of sun and an average 82 f daytime temp, a \$100 16'x16' plastic film greenhouse with 1x3 bows and a \$50 lasko 16" 90 w window fan could collect 0.9x1550x256ft^2/8h = 44.6k btu/h, heating 2470 cfm of 82 f air to 82+44.6k/2470 = 100 f. with temp t and vapor pressure pi and w in a house with an 800 btu/h-f conductance, we could remove p = 60x2470x0.075(w-0.0158) = 11115w-176 pounds of water per hour. if (100-t)2470 = (t-82)(2470+800)+1000p, ie 247-2.47t = 3.27t-268-p, p = 5.74t - 515 = 11115w-176, so t = 120.4-1936w. pi = e^(17.863-9621/(460+t)) "hg and w = 0.62198/(29.921/pi-1) makes t = 120.4-1204/(29.921/pi-1), ie pi = 29.921((120.4-t)/(1324-t)), so t = 9621/(14.46-ln((120.4-t)/(1324-t)))-460. plugging in t = 80 f on the right makes t = 74 on the left. repeating makes t = ... 78.79. 20 td=(78.1+86.6)/2'average daytime temp (f) 30 wa=.0158'outdoor humidity ratio 40 cfm=2470'fan airflow (cfm) 45 sunpower=.9*256*1550/8'solar heat (btu/h) 50 tg=td+sunpower/cfm'greenhouse temp (f) 60 gh=800'house conductance (btu/h-f) 70 t=80'initial house temp est (f) 80 term1=17.863-log(29.921) 90 term2=(2*cfm+gh)/1000 100 term3=60*cfm*.075 105 term4=(cfm*tg+td*(cfm+gh))/1000 110 t1=(term4+term3*wa)/term2 120 t2=t1+term3*.62198/term2 130 th=9621/(term1-log((t1-t)/(t2-t)))-460 140 if abs(t-th)>.01 then t=th:goto 130 150 pi=exp(17.863-9621/(460+t)) 160 wi=.62198/(29.921/pi-1) 170 p=4.5*cfm*(wi-wa) 180 print t,pi,wi,p indoor vapor humidity pounds temp pressure ratio per hour 78.79059 1.006362 2.164776e-02 64.99785 september 71.0885 .7767595 1.657717e-02 57.5442 october so it looks like we can remove about 8 gallons per hour or 64 gallons per day this way in september, and 57 in october, with 1370 btu/ft^2 of sun and a 69.1 average and 79.4 max and wa = 0.0114. nick ```  I got ALL of these 85 Solar Panels for FREE and so can you.  Its in our Ebook Ready for DOWNLOAD NOW. 