Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 775
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4,946
Default 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?
  #3   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 2,901
Default R-values of reflective insulation materials

"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....


  #4   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4,926
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 2,901
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 775
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 2,387
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 775
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 42
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4
Default R-values of reflective insulation materials


wrote
Under what kind of glazing? Warm water vapor quickly degrades
polycarbonate.

Yes I know, talking to people in the local plastic shop it aborbs water
vapour over time and goes brittle. I wanted them to heat bend some sheets of
it with folded right angle edges; cannot readily be done because of this.

Trickle panels a
3m high x 1m width galv iron sheets, matt black powder coated on the sun
side, water channels made by vertically running silicon beading spaced every
5cm down the metal sheet, laying 75u clear mylar on top of the silicon,
lightly pressing before it sets to form a vapour shield. The water runs
between the metal and the mylar. Each panel then sits in a wood frame with
an overall cover of 1mm flat clear thick polycarbonate with uv protection.

Time will tell how long the mylar will last. The poly glazing will block the
uv entering the box and hopefully stop the plastic header/bottom water pipes
from falling to bits..

Was going to run multiple air spaced layers of foil faced building
insulation paper (the stuff without bitumen) behind the metal panels finally
the wooden ply bottom. Figured some water vapour will escape into the box ,
so there will be vent holes.


Multiple relfective airspaces require iteration to determine intermediate
surface temps, as described in ASTM STP 1116. Adding individual airspace
resistances does not work.


May make a small test panel and do some measurements with foil then non
water absorbent insulation material.


Cheers
Mike (NZ)


  #13   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 4
Default 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   Report Post  
Posted to alt.solar.thermal,alt.home.repair,sci.engr.heat-vent-ac
external usenet poster
 
Posts: 336
Default R-values of reflective insulation materials

On 29 Apr 2008 09:49:46 -0400, wrote:

It's not easy to estimate the US R-value of a reflective insulation system.
It varies from about 1 to 10


.....and most of the time it can be completely ignored (assuming you
are not working on an off the planet application)


--
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Loft insulation U values. Where to find a chart? Mike Barnard UK diy 8 December 31st 07 12:48 PM
Home SALES values -vs- ASSESSED values? chaz Home Ownership 11 December 14th 05 09:50 PM
Slab Insulation 'R' values for tonight. Liz UK diy 7 December 13th 05 04:28 PM
Followup: Roof insulation materials Anna Kettle UK diy 23 July 6th 05 12:53 PM
u values, insulation. legin UK diy 2 May 19th 04 04:18 PM


All times are GMT +1. The time now is 09:00 AM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 DIYbanter.
The comments are property of their posters.
 

About Us

"It's about DIY & home improvement"