Spectral Weighting Function Modification
Research Project Monitoring Task Group
CHAIRS
CONTACT INFORMATION
Objective
The intent of this research
project is to provide a recommended spectrum to NFRC by assessing
the impact of a potential change in the reference spectrum that
is used to properly weigh the spectral transmission calculations
through glazing. It is therefore proposed (i) to evaluate the
effect that adopting one of the new possible spectra would have
on the optical properties, SHGC and VT ratings of typical fenestration
systems; (ii) to follow closely the progress of CIE’s standardization
work with the help of a liaison; and (iii) to orient their work
so that NFRC’s needs for a single spectrum (specifically
applicable to fenestration rating) are fully taken into consideration.
Status
- This project is complete.
- The final report has been approved and submitted for peer
review submission.
- Another more final report made at the Spring 08 Membership
meeting. Minor changes were made.
- Final report presentation made at the Fall 08 Membership meeting.
Only peer reviewed submission remians.
- Progress reported at Fall 07 meeting, final report expected
prior to March 08 meeting
- Second progress report delivered @ summer 07 membership meeting
in Denver
- First progress report delivered March 1, 2007 (see below)
- Solar Consulting Services and Sunergy Consulting were awarded
this project at the fall 2006 membership meeting. Expected
completion is December 1, 2007.
Documents:
For those interesting
in investigating potential rating changes this reseach
enables:
The final report and
accompanying spreadsheets for Revision of Standard Spectral
Weighting Function for Calculation of Solar Optical Properties
and Solar Heat Gain are linked here:
Please note that if the membership
considers this report's recommendations (page 28), the modifications
to NFRC 200 and NFRC 300 will generate SHGC and Visible Transmittance
values that may differ from existing ratings. To help the membership
better understand the proposal's ramifications, instructions have
been developed to guide members how to use WINDOW 5.2 to generate
new SHGC and Visible Transmittance values based on this research
project's recommendations. The instructions are linked here:
Contact NFRC staff (Ray
McGowan, rmcgowan@nfrc.org, 240-821-9510) if you have any questions.
Please note, membership has not voted
to include this research in any NFRC documents yet. This
research has been forwarded to the Technical Committee for consideration
in the pending 2009 document cycle.
Meeting Notes
Participants
- Bipin Shah (Chair)
- Ross McCluney
- Jason Theois
- Mahabir Bhandari
- Christian Koehler
- Ray McGowan (staff)
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