LBNL update on diffuse glazing work and IGSDB

developmentJacob C. Jonsson

Lawrence Berkeley National Laboratory

as of DATE #NFRCMeetings 1

Diffuse Glazing ILC• By March 3 only three laboratories had submitted data• Those data sets were incomplete, i.e. only reporting some of

the properties requested• Participants have had different issues preventing them from

reporting data

2#NFRCMeetingsas of DATE

Preliminary results makes sense

as of DATE #NFRCMeetings 3

• Diffuse interlayer. Blue line is more correct value measured with large sphere, red line same property measured poorly

• More scattering at shorter wavelengths matches the results

Preliminary results makes sense

as of DATE #NFRCMeetings 4

• Fritted glass with low-e coating, scattering surface closest to sphere in the graph to the right, smooth surface closest to the sphere in the left

• Larger error when there is longer distance from the scattering to the port

WINDOW 7.7.Diffuse• Update to WINDOW 7.7.10 where spectral

direct-diffuse data measured according to NFRC 300 can be imported

• Calculation of single scattering layer is getting close, WINDOW is preventing people from trying to calculate e.g. a single layer of venetian blind

as of DATE #NFRCMeetings 5

WINDOW 7.7.Diffuse

as of DATE #NFRCMeetings 6

• The interim CGDB text file format containing information about 3 pairs of properties, reflectance, transmittance, direct, diffuse, front, and back is imported as a shade material (not using optics)

• WINDOW generates a shade layer which can be used in a glazing system

WINDOW 7.7.Diffuse

as of DATE #NFRCMeetings 7

• Disagreement between specular calcand matrix calcaccurate at 3rd

decimal• Scattering layer

can be anywhere in the system (first, middle, last)

WINDOW 7.7.Diffuse plan for public release• Built on 7.7.10, only addition compared to

NFRC approved version is import of direct-diffuse data

• Will get a proper version number rather than 7.7.Diffuse (probably 7.7.12).

as of DATE #NFRCMeetings 8

IGSDB• International Glazing and Shading Database,

the future replacement of IGDB and CGDB• Life improvements for data submitters where

data is uploaded through a web interface and you get automated checking and can see the data in peer review mode

as of DATE #NFRCMeetings 9

IGDSB compare mode (fictitious review)

as of DATE #NFRCMeetings 10

IGSDB peer review files (fictitious review)

• Similar look to current table and graphs

• Will roll this out for IGDB peer review before we switch to IGSDB

as of DATE #NFRCMeetings 11

Thank you from all of theLBNL WINDOW team

Questions/comments

#NFRCMeetings 12as of DATE