window7 / therm7 - cdn.ymaws.com · window/therm history • window4.1 ms-dos based • window5...

WINDOW7 / THERM7

Christian Kohler, Robin Mitchell, Charlie Curcija,

Ling Zhu, Simon Vidanovic, Stephen Czarnecki,

Charlie Huizenga, Dariush Arasteh

Lawrence Berkeley National Laboratory

March 2014

WINDOW/THERM History

• WINDOW4.1 MS-DOS based

• WINDOW5 first MS Windows version, ISO 15099, Optics5

algorithms

• THERM2 released for frames.

• WINDOW6 first version with shading and complex glazing.

• Radically different thermal and optical models

• New Models: – Venetian Blinds

– Woven Shades

– Fritted Glass

– BSDF’s

– EN 673 models

– Multiple shading thermal models (ISO 15099, Waterloo, Scalar)

Which versions of WINDOW have you used?

WINDOW history

• WINDOW 3.1 1988

• WINDOW 4.0 1992

• WINDOW 4.1 1994

• WINDOW 5 2001

• WINDOW 5.2 2003

• WINDOW 6 2005

• WINDOW 6.1 2007

• WINDOW 6.2 2008

• WINDOW 6.3 2011

• WINDOW 7.0 2011

• WINDOW 7.1 2012

• WINDOW 7.2 2013

WINDOW7

• Technical changes – Newer compiler

– More stable thermal solution from EnergyPlus

• New models – Cellular shades

– Perforated screens

– Vertical louvered blinds

– Deflection

– Vacuum glazing

– Chromogenics

• Better IGDB Updater

THERM7

• Minor changes, mostly to stay compatible

with WINDOW

• Added surface potential condensation

IGDB Updater improvements

DEMO

DEFLECTION

VACUUM

Cellular Shades

Chromogenics

RESULTS VERIFICATION – GLAZING

SYSTEMS

Max difference:

U-factor 0.02%

SHGC: 0.08%

RESULTS VERIFICATION - WHOLE

WINDOWS

Max difference:

U-factor 0.08% 0.00147

SHGC: 0.00%

Published in release notes:

http://windows.lbl.gov/software/window/7/7.2.34/w7_releasenotes.htm

SPEED IMPROVEMENTS

0

0.05

0.1

0.15

0.2

0.25

0.3

- 100 200 300 400 500 600 700 800 900 1,000

Ho

urs

Number of windows

Whole Windows with THERM Files

W6.3

W7.2

0

0.5

1

1.5

2

2.5

- 1,000 2,000 3,000 4,000 5,000 6,000 7,000

Ho

urs

Number of windows

Whole Windows with THERM Files

W6.3

W7.2

WINDOW7 SPEED-UP

SUMMARY

• Current changes for NFRC:

– Faster

– Chromogenics display and database structure.

• WINDOW7 new models can be later adopted by

NFRC

• Results are very close

• Available from: http://windows.lbl.gov/software/window/7

THANK YOU

Contact info

Christian Kohler

Windows and Envelope Materials Group

Lawrence Berkeley National Laboratory

CJKohler@lbl.gov

Windows.lbl.gov

510-486-5040

Download all Software from http://windows.lbl.gov/software