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re: pjm - founder
14 sep 2004
 wrote:

>	but, but, but .... what about my plans to take over the world
>?  i thought a usenet group would be as good a place to start as any
>....

fight those evil thoughts. let goodness and mercy envelop your soul.
pretend that people are cats. 

>	nick, get help.  psychiatric help.  you're getting worse and
>worse as time goes on, and eventually you're going to find yourself
>living out in a cabin in the woods, sending packages to people.

i do that already, but there are easier ways to get your face on a stamp. 
you can buy a sheetful for a mere $20, if you do the graphics on-line...

cheers,

nick

work in progress...

20 ta=84'ambient temp (f)
30 wa=.0185'ambient humidity ratio
40 pa=29.921/(.62198/wa+1)'ambient vapor pressure ("hg)
50 tdp=9621/(17.863-log(pa))-460'dew point temp (f)
60 twbl=460+(ta+tdp)/2'initial twb estimate (r)
70 twb=9621/(22.468-log(ta+460+100*pa-twb))'wet bulb temp (r)
80 if abs(twb-twbl)/twb >.01 then twbl=twb:goto 70
90 twb=twb-460'wet bulb temp (f)
100 carea=200'clothing area (ft^2, 1 side)
110 gc=1.5*2*carea'clothing-air conductance (btu/h-f)
120 dryrate=(ta-twb)*gc'drying rate (btu/h)
130 ww=12'water weight (pounds)
140 drytime=1000*ww/dryrate'drying time (h)
150 print 0,ta,twb,tdp,drytime
170 fullsun=250'solar power (btu/ft^2-h)
180 sunpower=.9*16*16*fullsun'sun into greenhouse (btu/h)
190 gg=256'greenhouse thermal conductance (btu/h)
200 rho=.075'nominal air density (lb/ft^3)
210 lat=1000'latent heat (btu/lb)
220 f1=60*lat*rho'factor
230 f2=60*lat*rho/gc'factor
240 tar=ta+460'ambient temp (r)
250 for c=100 to 200 step 20'greenhouse airflow (cfm)
260 alpha=sunpower+gg*tar+wa*c*(f1+f2*(c+gg))+tar*c
270 beta=gg+c
280 gamma=c*(f1+f2*(c+gg))
290 twbl=100+460'twb initial est (r)
300 wi=(alpha-beta*twbl)/gamma'greenhouse humidity ratio
310 twb=9621/(22.468-log(ta+460+2992.1/(.62198/wi+1)-twb))
320 if abs(twb-twbl)/twb >.01 then twbl=twb:goto 300
330 twb=twb-460'wet bulb temp (f)
340 tg=twb+f2*c*(wi-wa)'greenhouse air temp (f)
350 dryrate=(tg-twb)*gc'drying rate (btu/h)
360 drytime=1000*ww/dryrate'drying time (h)
370 pi=29.921/(.62198/wi+1)'greenhouse vapor pressure ("hg)
380 tdp=9621/(17.863-log(pi))-460'greenhouse dew point (f)
390 print c,tg,twb,tdp,drytime
400 next

airflow       dry bulb      wet bulb      dew point     drying time

free          84 f          77.61066 f    74.23621 f    3.130212 hours

100 cfm       161.7445      114.8843      118.6882      .4268011
120           157.2436      110.5703      114.3571      .4285108
140           157.7107      109.005       111.8636      .4106299
160           154.7812      106.2406      108.9128      .4120266
180           152.2271      103.9094      106.3851      .4139266
200           149.969       101.9149      104.1895      .4161981

the first is the clothesline. why is the wet bulb less than the dew point?




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