[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Use of radiant barrier systems in walls/roofs


I am doing analysis on a steel-roofed building in Guatemala.  Typical
construction there is just a simple corrugated steel roof, with no other
insulation, etc.  Ventilation only, no air conditioning.

I am investigating whether using a radiant barrier (aluminum foil facing on
a 4mm thick plastic bubble sheet) is appropriate.  Sources have recommended
a 25mm gap between the roof and the radiant barrier.

Can EnergyPlus correctly model the effect of the radiant barrier on the roof
heat transfer?  I dug around the documentation quite a bit and couldn't find
the answer.  For now, I have created a construction containing:
1.  Steel roof (Material:Regular)
2.  Air gap (Material:Air)
3.  Radiant barrier (Material:Regular-R)

Will radiation cross the air gap, or is the air gap just acting as a thermal
resistance (conductivity only)?  If there is a better way to do this, I
would appreciate any pointers!


The primary EnergyPlus web site is found at:

The group web site is:

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
Yahoo! Groups Links

<*> To visit your group on the web, go to:

<*> To unsubscribe from this group, send an email to:

<*> Your use of Yahoo! Groups is subject to: