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R-values of reflective insulation materials - Page 2

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Posted by nicksanspam on April 29, 2008, 1:49 pm
 


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


Posted by Solar Mike on April 29, 2008, 7:42 pm
 


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



Posted by .p.jm on April 29, 2008, 7:50 pm
 On Wed, 30 Apr 2008 07:42:22 +1200, "Solar Mike"


    Isn't that special :-)


    Oh, those radical modern bastards ! :-)

    How's your sliderule ?  Still a slippin' and a slidin' ?


--
Click here every day to feed an animal that needs you today !!!
www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo online at www.pmilligan.net/palm/
Free 'People finder' program now at www.pmilligan.net/finder.htm

Posted by .p.jm on April 30, 2008, 12:29 am
 wrote:


    And, for those hard to reach places .....

    MULTIPLY !!!!!


--
Click here every day to feed an animal that needs you today !!!
www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo online at www.pmilligan.net/palm/
Free 'People finder' program now at www.pmilligan.net/finder.htm

Posted by nicksanspam on April 29, 2008, 11:34 pm
 

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


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