About Us +
Researchers in the Building Technology & Urban Systems Division (BTUS) at Lawrence Berkeley National Laboratory develop data and technologies that increase energy efficiency and improve the health, safety and comfort of building occupants, in the United States and worldwide.

We work closely with industry partners, academics and government officials to achieve these goals, and share our research widely
Research +
We are at the forefront of cutting-edge research that redefines building technology and explores all areas of urban systems.

We have been leaders for decades in developing energy-efficient windows, improving indoor air quality, coming up with new ideas to fix the nation's electricity grid, and so much more.

Visit our research areas at the right to find out more.
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Publications +
Enjoy presentations from Building Technology & Urban systems research experts on a wide variety of topics in the areas of building energy efficiency, the electricity grid and how it relates to buildings and much more.
- Presentations
News
Tools & Guides +
Explore our tools, guidebooks and software and download for free.

We offer a variety of technologies designed to simulate and model real-world circumstances to assist in energy-saving programs and help building owners build better buildings. These tools can help calculate performance of building systems like windows and shades, help consumers and builders pick the best windows for a variety of applications and much more.

Publications

Publications By Research Area

2022

Ward, Gregory J., David Geisler-Moroder, Eleanor S. Lee, Jacob C. Jonsson, and Taoning Wang."Daylight Simulation Workflows Incorporating Measured Bidirectional Scattering Distribution Functions."Energy and Building 259 (2022).

2021

Gao, Yuan, Qiye Zheng, Jacob C. Jonsson, Sean D. Lubner, Dragan C. Curcija, Luis L. Fernandes, Sumanjeet Kaur, and Christian Kohler."Parametric study of solid-solid translucent phase change materials in building windows."Applied Energy 301 (2021) 117467. DOI

Apian-Bennewitz, Peter, Jan de Boer, Bruno Bueno, Bertrand Deroisy, Yuan Fang, David Geisler-Moroder, David Geisler-Moroder, Lars O. Grobe, Jacob C. Jonsson, Eleanor S. Lee, Zhen Tian, Taoning Wang, Gregory J. Ward, Helen Rose Wilson, and Yujie Wu."Analysis and evaluation of BSDF characterization of daylighting systems." (2021). DOI

2017

McNeil, Andrew, Eleanor S. Lee, and Jacob C. Jonsson."Daylight performance of a microstructured prismatic window film in deep open plan offices."Building and Environment 113 (2017) 280–297. DOI

2014

Fernandes, Luis L., Eleanor S. Lee, Andrew McNeil, Jacob C. Jonsson, Thierry Stephane Nouidui, Xiufeng Pang, and Sabine Hoffmann."Angular selective window systems: Assessment of technical potential for energy saving." (2014) 36.

2013

McNeil, Andrew, Jacob C. Jonsson, David Appelfeld, Gregory J. Ward, and Eleanor S. Lee."A validation of a ray-tracing tool used to generate bi-directional scattering distribution functions for complex fenestration systems."Solar Energy 98.C (2013) 404-414. DOI

Lee, Eleanor S., Luis L. Fernandes, Howdy Goudey, Jacob C. Jonsson, Dragan C. Curcija, Xiufeng Pang, Dennis L. DiBartolomeo, and Sabine Hoffmann."A Pilot Demonstration of Electrochromic and Thermochromic Windows in the Denver Federal Center, Building 41, Denver, Colorado." (2013).

2011

Ward, Gregory J., Richard G. Mistrick, Eleanor S. Lee, Andrew McNeil, and Jacob C. Jonsson."Simulating the Daylight Performance of Complex Fenestration Systems Using Bidirectional Scattering Distribution Functions within Radiance."Leukos, The Journal of the Illuminating Engineering Society 7.4 (2011). DOI

2010

Nilsson, Annica M., and Jacob C. Jonsson."Light-scattering properties of a Venetian blind slat used for daylighting applications."Solar Energy 84.12 (2010) 2103 - 2111. DOI

2009

Konstantoglou, Maria, Jacob C. Jonsson, and Eleanor S. Lee."Simulating Complex Window Systems Using BSDF Data."26th Conference on Passive and Low Energy Architecture (PLEA), June-22-24 (2009).

Jonsson, Jacob C., Michael D. Rubin, Annica M. Nilsson, Andreas Jonsson, and Arne Roos."Optical characterization of fritted glass for architectural applications."Optical Materials 31.6 (2009) 949 - 958. DOI

2008

Jonsson, Jacob C., Eleanor S. Lee, and Michael D. Rubin."Light-scattering properties of a woven shade-screen material used for daylighting and solar heat-gain control."SPIE Optics+Photonics (2008).

2007

Jonsson, Jacob C., and Michael D. Rubin."NFRC Interlaboratory Comparison on Optical Properties."NFRC Conference (2007).

Jonsson, Jacob C., and Henrik Branden."Obtaining the Bidirectional Transfer Distribution Function of Isotropically Scattering Materials Using an Integrating Sphere."Optics Communications 277 (2007) 228-236.