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#1
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R-values of reflective insulation materials
Adapted from "Prediction of the thermal performance of single and
multi-airspace reflective insulation materials" by Andre O. Desjarlais and David W. Yarbrough, from ASTM STP 1116--Insulation Materials, Testing and Applications, Ronald S. Graves and Donald C. Wysocki, editors, 2nd volume, October 1991, pp 24-43: 20 DATA 2.5,5.09,7.5,1.4959,-0.608,6.359e-2,6.5572e-3,2.7129e-4 30 DATA 3.5,4.68,7.82,-1.3771,.2989,5.93e-3,1.2676e-3,8.7056e-2 40 DATA 2.5,4.35,7.2,-2.2234,0.6784,-3.028e-2,1.6481e-3,2.3528e-2 50 DATA 0,0,0,0,0,0,0,0 60 DATA 2.5,3.49,6.8,-.862,.2912,-3.863e-4,.16645,-1.397e-2 70 DATA 2.5,4.14,6.9,-.3,.0381,2.409e-2,1.5679e-2,-3.4369e-2 80 FOR I=0 TO 5 90 READ GR0(I),GR1(I),GR2(I),A(I),B(I),C(I),A2(I),A3(I) 100 NEXT I 110 DIR=0'heatflow direction 120 IF DIR=-1 THEN DIR$="down" 130 IF DIR=0 THEN DIR$="horiz" 140 IF DIR=1 THEN DIR$="up" 150 DIAG=0'0 for up or down, 1 for diagonal heatflow 160 IF DIAG=0 THEN DIAG$="no" ELSE DIAG$="yes" 170 I=2*DIR+DIAG+2'index (0-5, skipping 3) 180 T1=30'surface 1 temp (F) 190 T2=70'surface 2 temp (F) 200 DT=ABS(T2-T1)'temp diff 210 TBAR=(T1+T2)/2'mean temp 220 HR=.00686*((TBAR+460)/100)^3'radiation conductance (Btu/h-F-ft^2) 230 E1=.05'surface 1 emittance 240 E2=.05'surface 2 emittance 250 E=1/(1/E1+1/E2-1)'effective emittance 260 L=3.5'airspace width (inches) 270 LGR=LOG(DT*L^3)/LOG(10)+3.4146-.004359*TBAR+3.6441E-06*TBAR^2'log10 Grashof 280 IF LGRLOG(GR0(I))/LOG(10) THEN LNU=0: GOTO 320 290 IF LGR=LOG(GR1(I))/LOG(10) THEN LNU=A(I)+B(I)*LGR+C(I)*LGR^2:GOTO 320'eq 5 300 LNU=A2(I)*(LGR-LOG(GR0(I))/LOG(10))^2 310 LNU=LNU+A3(I)*(LGR-LOG(GR0(I))/LOG(10))^3'equation 6 320 NU=10^LNU'Nusselt number 330 K=.0003053*TBAR+.1575'air conductivity (Btu-in/F-ft^2-F) 340 HC=K*NU/L'convection conductance 350 R=1/(E*HR+HC)'US R-value (ft^2-F-h/Btu) 360 PRINT "gap (in):",L 370 PRINT "dir:",DIR$,"diag:",DIAG$ 380 PRINT "T1 (F):",T1,"T2 (F):",T2 390 PRINT "Tmean (F):",TBAR,"dT (F):",DT 400 PRINT "E1:",E1,"E2:",E2 410 PRINT "Eeff:",E 420 PRINT "R-value:",R gap (in): 3.5 dir: horiz diag: no T1 (F): 30 T2 (F): 70 Tmean (F): 50 dT (F): 40 E1: .05 E2: .05 Eeff: 2.564103E-02 R-value: 2.461726 Nick |
#2
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R-values of reflective insulation materials
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#3
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R-values of reflective insulation materials
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#4
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R-values of reflective insulation materials
On Apr 28, 11:55*pm, "JoeSpareBedroom" wrote:
"Red Green" wrote in message ... wrote in : Adapted from "Prediction of the thermal performance of single and multi-airspace reflective insulation materials" by Andre O. Desjarlais and David W. Yarbrough, from ASTM STP 1116--Insulation Materials, Testing and Applications, Ronald S. Graves and Donald C. Wysocki, editors, 2nd volume, October 1991, pp 24-43: 20 DATA 2.5,5.09,7.5,1.4959,-0.608,6.359e-2,6.5572e-3,2.7129e-4 30 DATA 3.5,4.68,7.82,-1.3771,.2989,5.93e-3,1.2676e-3,8.7056e-2 40 DATA 2.5,4.35,7.2,-2.2234,0.6784,-3.028e-2,1.6481e-3,2.3528e-2 50 DATA 0,0,0,0,0,0,0,0 60 DATA 2.5,3.49,6.8,-.862,.2912,-3.863e-4,.16645,-1.397e-2 70 DATA 2.5,4.14,6.9,-.3,.0381,2.409e-2,1.5679e-2,-3.4369e-2 80 FOR I=0 TO 5 90 READ GR0(I),GR1(I),GR2(I),A(I),B(I),C(I),A2(I),A3(I) 100 NEXT I 110 DIR=0'heatflow direction 120 IF DIR=-1 THEN DIR$="down" 130 IF DIR=0 THEN DIR$="horiz" 140 IF DIR=1 THEN DIR$="up" 150 DIAG=0'0 for up or down, 1 for diagonal heatflow 160 IF DIAG=0 THEN DIAG$="no" ELSE DIAG$="yes" 170 I=2*DIR+DIAG+2'index (0-5, skipping 3) 180 T1=30'surface 1 temp (F) 190 T2=70'surface 2 temp (F) 200 DT=ABS(T2-T1)'temp diff 210 TBAR=(T1+T2)/2'mean temp 220 HR=.00686*((TBAR+460)/100)^3'radiation conductance (Btu/h-F-ft^2) 230 E1=.05'surface 1 emittance 240 E2=.05'surface 2 emittance 250 E=1/(1/E1+1/E2-1)'effective emittance 260 L=3.5'airspace width (inches) 270 LGR=LOG(DT*L^3)/LOG(10)+3.4146-.004359*TBAR+3.6441E-06*TBAR^2'log10 Grashof 280 IF LGRLOG(GR0(I))/LOG(10) THEN LNU=0: GOTO 320 290 IF LGR=LOG(GR1(I))/LOG(10) THEN LNU=A(I)+B(I)*LGR+C(I)*LGR^2:GOTO 320'eq 5 300 LNU=A2(I)*(LGR-LOG(GR0(I))/LOG(10))^2 310 LNU=LNU+A3(I)*(LGR-LOG(GR0(I))/LOG(10))^3'equation 6 320 NU=10^LNU'Nusselt number 330 K=.0003053*TBAR+.1575'air conductivity (Btu-in/F-ft^2-F) 340 HC=K*NU/L'convection conductance 350 R=1/(E*HR+HC)'US R-value (ft^2-F-h/Btu) 360 PRINT "gap (in):",L 370 PRINT "dir:",DIR$,"diag:",DIAG$ 380 PRINT "T1 (F):",T1,"T2 (F):",T2 390 PRINT "Tmean (F):",TBAR,"dT (F):",DT 400 PRINT "E1:",E1,"E2:",E2 410 PRINT "Eeff:",E 420 PRINT "R-value:",R gap (in): * * *3.5 dir: * * * * * horiz * * * *diag: * * * * *no T1 (F): * * * *30 * * * * * T2 (F): * * * *70 Tmean (F): * * 50 * * * * * dT (F): * * * *40 E1: * * * * * .05 * * * * * E2: * * * * * .05 Eeff: * * * * *2.564103E-02 R-value: * * * 2.461726 Nick Another rap tune? In Basic....- Hide quoted text - - Show quoted text - Can anyone understand what he posted, will it actualy help themselves ! No..its nickys numbers, again. |
#5
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
wrote in
: Adapted from "Prediction of the thermal performance of single and multi-airspace reflective insulation materials" by Andre O. Desjarlais and David W. Yarbrough, from ASTM STP 1116--Insulation Materials, Testing and Applications, Ronald S. Graves and Donald C. Wysocki, editors, 2nd volume, October 1991, pp 24-43: 20 DATA 2.5,5.09,7.5,1.4959,-0.608,6.359e-2,6.5572e-3,2.7129e-4 30 DATA 3.5,4.68,7.82,-1.3771,.2989,5.93e-3,1.2676e-3,8.7056e-2 40 DATA 2.5,4.35,7.2,-2.2234,0.6784,-3.028e-2,1.6481e-3,2.3528e-2 50 DATA 0,0,0,0,0,0,0,0 60 DATA 2.5,3.49,6.8,-.862,.2912,-3.863e-4,.16645,-1.397e-2 70 DATA 2.5,4.14,6.9,-.3,.0381,2.409e-2,1.5679e-2,-3.4369e-2 80 FOR I=0 TO 5 90 READ GR0(I),GR1(I),GR2(I),A(I),B(I),C(I),A2(I),A3(I) 100 NEXT I 110 DIR=0'heatflow direction 120 IF DIR=-1 THEN DIR$="down" 130 IF DIR=0 THEN DIR$="horiz" 140 IF DIR=1 THEN DIR$="up" 150 DIAG=0'0 for up or down, 1 for diagonal heatflow 160 IF DIAG=0 THEN DIAG$="no" ELSE DIAG$="yes" 170 I=2*DIR+DIAG+2'index (0-5, skipping 3) 180 T1=30'surface 1 temp (F) 190 T2=70'surface 2 temp (F) 200 DT=ABS(T2-T1)'temp diff 210 TBAR=(T1+T2)/2'mean temp 220 HR=.00686*((TBAR+460)/100)^3'radiation conductance (Btu/h-F-ft^2) 230 E1=.05'surface 1 emittance 240 E2=.05'surface 2 emittance 250 E=1/(1/E1+1/E2-1)'effective emittance 260 L=3.5'airspace width (inches) 270 LGR=LOG(DT*L^3)/LOG(10)+3.4146-.004359*TBAR+3.6441E-06*TBAR^2'log10 Grashof 280 IF LGRLOG(GR0(I))/LOG(10) THEN LNU=0: GOTO 320 290 IF LGR=LOG(GR1(I))/LOG(10) THEN LNU=A(I)+B(I)*LGR+C(I)*LGR^2:GOTO 320'eq 5 300 LNU=A2(I)*(LGR-LOG(GR0(I))/LOG(10))^2 310 LNU=LNU+A3(I)*(LGR-LOG(GR0(I))/LOG(10))^3'equation 6 320 NU=10^LNU'Nusselt number 330 K=.0003053*TBAR+.1575'air conductivity (Btu-in/F-ft^2-F) 340 HC=K*NU/L'convection conductance 350 R=1/(E*HR+HC)'US R-value (ft^2-F-h/Btu) 360 PRINT "gap (in):",L 370 PRINT "dir:",DIR$,"diag:",DIAG$ 380 PRINT "T1 (F):",T1,"T2 (F):",T2 390 PRINT "Tmean (F):",TBAR,"dT (F):",DT 400 PRINT "E1:",E1,"E2:",E2 410 PRINT "Eeff:",E 420 PRINT "R-value:",R gap (in): 3.5 dir: horiz diag: no T1 (F): 30 T2 (F): 70 Tmean (F): 50 dT (F): 40 E1: .05 E2: .05 Eeff: 2.564103E-02 R-value: 2.461726 Nick Another rap tune? In Basic....- Hide quoted text - - Show quoted text - Can anyone understand what he posted, will it actualy help themselves ! No..its nickys numbers, again. What version of basic is this, looks like GWBasic or TurboBasic, something I last used about 15 - 20 years ago. Can you still get it. Have been running VB.Net last 8 years, and VB6 before that. If someone could point me in the direction of where to get a suitable windows version to run this, would be cool to try running the code. Cheers Mike (NZ) |
#6
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
"Solar Mike" wrote in message
... wrote in : Adapted from "Prediction of the thermal performance of single and multi-airspace reflective insulation materials" by Andre O. Desjarlais and David W. Yarbrough, from ASTM STP 1116--Insulation Materials, Testing and Applications, Ronald S. Graves and Donald C. Wysocki, editors, 2nd volume, October 1991, pp 24-43: 20 DATA 2.5,5.09,7.5,1.4959,-0.608,6.359e-2,6.5572e-3,2.7129e-4 30 DATA 3.5,4.68,7.82,-1.3771,.2989,5.93e-3,1.2676e-3,8.7056e-2 40 DATA 2.5,4.35,7.2,-2.2234,0.6784,-3.028e-2,1.6481e-3,2.3528e-2 50 DATA 0,0,0,0,0,0,0,0 60 DATA 2.5,3.49,6.8,-.862,.2912,-3.863e-4,.16645,-1.397e-2 70 DATA 2.5,4.14,6.9,-.3,.0381,2.409e-2,1.5679e-2,-3.4369e-2 80 FOR I=0 TO 5 90 READ GR0(I),GR1(I),GR2(I),A(I),B(I),C(I),A2(I),A3(I) 100 NEXT I 110 DIR=0'heatflow direction 120 IF DIR=-1 THEN DIR$="down" 130 IF DIR=0 THEN DIR$="horiz" 140 IF DIR=1 THEN DIR$="up" 150 DIAG=0'0 for up or down, 1 for diagonal heatflow 160 IF DIAG=0 THEN DIAG$="no" ELSE DIAG$="yes" 170 I=2*DIR+DIAG+2'index (0-5, skipping 3) 180 T1=30'surface 1 temp (F) 190 T2=70'surface 2 temp (F) 200 DT=ABS(T2-T1)'temp diff 210 TBAR=(T1+T2)/2'mean temp 220 HR=.00686*((TBAR+460)/100)^3'radiation conductance (Btu/h-F-ft^2) 230 E1=.05'surface 1 emittance 240 E2=.05'surface 2 emittance 250 E=1/(1/E1+1/E2-1)'effective emittance 260 L=3.5'airspace width (inches) 270 LGR=LOG(DT*L^3)/LOG(10)+3.4146-.004359*TBAR+3.6441E-06*TBAR^2'log10 Grashof 280 IF LGRLOG(GR0(I))/LOG(10) THEN LNU=0: GOTO 320 290 IF LGR=LOG(GR1(I))/LOG(10) THEN LNU=A(I)+B(I)*LGR+C(I)*LGR^2:GOTO 320'eq 5 300 LNU=A2(I)*(LGR-LOG(GR0(I))/LOG(10))^2 310 LNU=LNU+A3(I)*(LGR-LOG(GR0(I))/LOG(10))^3'equation 6 320 NU=10^LNU'Nusselt number 330 K=.0003053*TBAR+.1575'air conductivity (Btu-in/F-ft^2-F) 340 HC=K*NU/L'convection conductance 350 R=1/(E*HR+HC)'US R-value (ft^2-F-h/Btu) 360 PRINT "gap (in):",L 370 PRINT "dir:",DIR$,"diag:",DIAG$ 380 PRINT "T1 (F):",T1,"T2 (F):",T2 390 PRINT "Tmean (F):",TBAR,"dT (F):",DT 400 PRINT "E1:",E1,"E2:",E2 410 PRINT "Eeff:",E 420 PRINT "R-value:",R gap (in): 3.5 dir: horiz diag: no T1 (F): 30 T2 (F): 70 Tmean (F): 50 dT (F): 40 E1: .05 E2: .05 Eeff: 2.564103E-02 R-value: 2.461726 Nick Another rap tune? In Basic....- Hide quoted text - - Show quoted text - Can anyone understand what he posted, will it actualy help themselves ! No..its nickys numbers, again. What version of basic is this, looks like GWBasic or TurboBasic, something I last used about 15 - 20 years ago. Can you still get it. Have been running VB.Net last 8 years, and VB6 before that. If someone could point me in the direction of where to get a suitable windows version to run this, would be cool to try running the code. Cheers Mike (NZ) It would be even cooler to go read a book. |
#7
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
Solar Mike wrote:
What version of basic is this, looks like GWBasic... Yup. IIRC, gwbasic.exe is still available free from a web site and runs from a DOS prompt. BWbasic is almost identical and runs with Ubuntu linux. The new ASHRAE comfort spec also contains a gwbasic program. It's not easy to estimate the US R-value of a reflective insulation system. It varies from about 1 to 10, depending on emissivities, airspace thickness, mean temperature, temperature difference, and the direction of heatflow. The complex table in the ASHRAE HOF rarely matches real situations, but this program can help with that. Nick |
#8
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
wrote Yup. IIRC, gwbasic.exe is still available free from a web site and runs from a DOS prompt. BWbasic is almost identical and runs with Ubuntu linux. The new ASHRAE comfort spec also contains a gwbasic program. It's not easy to estimate the US R-value of a reflective insulation system. It varies from about 1 to 10, depending on emissivities, airspace thickness, mean temperature, temperature difference, and the direction of heatflow. The complex table in the ASHRAE HOF rarely matches real situations, but this program can help with that. Thanks for that Nick I will google somewhere to download it from. Was going to use 3 reflective air spaced layers behind a trickle solar panel array system. Mike |
#9
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
Solar Mike wrote:
What version of basic is this, looks like GWBasic or TurboBasic, something I last used about 15 - 20 years ago. Can you still get it. Have been running VB.Net last 8 years, and VB6 before that. If someone could point me in the direction of where to get a suitable windows version to run this, would be cool to try running the code. Cheers Mike (NZ) Try http://www.geocities.com/KindlyRat/GWBASIC.html. I think that's where I got my copy a while back. I think you'll need to run it in a DOS or CMD window (depending on which version of Windows you're running). -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/ |
#10
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
Solar Mike wrote:
Thanks for that Nick I will google somewhere to download it from. Was going to use 3 reflective air spaced layers behind a trickle solar panel array system. Under what kind of glazing? Warm water vapor quickly degrades polycarbonate. Multiple relfective airspaces require iteration to determine intermediate surface temps, as described in ASTM STP 1116. Adding individual airspace resistances does not work. Nick |
#11
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R-values of reflective insulation materials
wrote:
On Wed, 30 Apr 2008 07:42:22 +1200, "Solar Mike" wrote: wrote Yup. IIRC, gwbasic.exe is still available free from a web site and runs from a DOS prompt. BWbasic is almost identical and runs with Ubuntu linux. The Isn't that special :-) new ASHRAE comfort spec also contains a gwbasic program. Oh, those radical modern *******s ! :-) How's your sliderule ? Still a slippin' and a slidin' ? I made mine into a really fine backscratcher. ;-p |
#12
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R-values of reflective insulation materials
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#13
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
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R-values of reflective insulation materials
"Morris Dovey" wrote in message Try http://www.geocities.com/KindlyRat/GWBASIC.html. I think that's where I got my copy a while back. I think you'll need to run it in a DOS or CMD window (depending on which version of Windows you're running). Thanks have just gone and downloaded it from the above link. Cheers Mike |
#14
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R-values of reflective insulation materials
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