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| Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
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pjm - founder
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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"bill" wrote in message ... In article , wrote: 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? No wonder most software sucks. Guys like you using ancient tools to make it with. This is **** from the 70's or earlier. Yup...it works on the C64....LOL Oh...btw..I have seen the future in calc design software, and the future ****in kicks ass.....dunno if its gonna run on a Mac tho... |
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On Tue, 14 Sep 2004 11:30:50 -0400, "Steve@carolinabreezehvac"
wrote: "bill" wrote in message ... In article , Oh...btw..I have seen the future in calc design software, and the future ****in kicks ass.....dunno if its gonna run on a Mac tho... What's a 'Mac' ? :-) Paul ( pjm @ pobox . com ) - remove spaces to email me 'Some days, it's just not worth chewing through the restraints.' HVAC/R program for Palm PDA's Free demo now available online http://pmilligan.net/palm/ Free Temperature / Pressure charts for 38 Ref's http://pmilligan.net/pmtherm/ |
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#5
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In article ,
"Steve@carolinabreezehvac" wrote: Yup...it works on the C64....LOL Oh...btw..I have seen the future in calc design software, and the future ****in kicks ass.....dunno if its gonna run on a Mac tho... Everything can run on a mac  |
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#6
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In article ,
wrote: What's a 'Mac' ? :-) That pains me! |
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#7
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wrote:
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)... 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... The first is the clothesline. Why is the wet bulb less than the dew point? 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 GA=C+GG 270 GP=GC+GA 280 ALPHA=SUNPOWER+GG*TAR+WA*C*(F1+F2*(C+GG))+TAR*C 290 BETA=GG+C 300 GAMMA=C*(F1+F2*(C+GG)) 310 TWBL=100+460'Twb initial est (R) 320 WI=(ALPHA-BETA*TWBL)/GAMMA'greenhouse humidity ratio 330 PI=29.921/(.62198/WI+1) 340 TGR=(SUNPOWER+GA*TAR+GC*TWBL)/GP 350 TWB=9621/(22.468-LOG(TGR+100*PI-TWBL)) 360 IF ABS(TWB-TWBL)/TWB .01 THEN TWBL=TWB:GOTO 320 370 TWB=TWB-460'wet bulb temp (F) 380 TG=TWB+F2*C*(WI-WA)'greenhouse air temp (F) 390 DRYRATE=(TG-TWB)*GC'drying rate (Btu/h) 400 DRYTIME=1000*WW/DRYRATE'drying time (h) 410 TDP=9621/(17.863-LOG(PI))-460'greenhouse dew point (F) 420 PRINT C,TG,TWB,TDP,DRYTIME 430 NEXT airflow dry bulb wet bulb dew point drying time free 84 F 77.61066 F 74.23621 F 3.130212 hours 100 cfm 165.9619 F 121.7136 F 117.3342 F .4519949 hours 120 162.1941 117.9772 113.1386 .4523157 140 158.9697 114.9237 109.6841 .4540707 160 156.1529 112.3674 106.7763 .4567723 180 153.6542 110.1876 104.2872 .4601233 200 151.4108 108.3012 102.1281 .4639328 Ah, much better, about 7X faster than a clothesline in humid air, but it looks like there will be condensation inside the R1 glazing, if it's 84 F outside and 166 inside with a 117 F dew point. How does that change the picture? It would probably also help to bring fresh air in through a poly duct surrounded by greenhouse air, with condensation on the outside of the duct. How can we model that? Paul might make a dryer design template. Just click here... :-) Nick |
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