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

2023

Maier, Laura, Christoph Nytsch-Geusen, Lucas Westermann, Kushagra Mathur, Michael Wetter, and Dirk Muller."Comparative Study and Validation of Photovoltaic Model Formulations for the IBPSA Modelica Library based on Rooftop Measurement Data." (2023).

2009

Nouidui, Thierry Stephane, Klaus Sedlbauer, Christoph Nytsch-Geusen, and Kurt Kießl."Neue objektorientierte hygrothermische Modell-Bibliothek zur Ermittlung des hygrothermischen und hygienischen Komforts in Räumen."Bauphysik 31 (2009) 271-278. DOI

2008

Nytsch-Geusen, Christoph, and Thierry Stephane Nouidui."Gebäudesimulation mit adaptiven Modellierungsansätzen."BAUSIM 2008 (2008).

Nouidui, Thierry Stephane, Christoph Nytsch-Geusen, Andreas Holm, and Klaus Sedlbauer."Object-oriented hygrothermal building physics library as a tool to predict and to ensure a thermal and hygric indoor comfort in building construction by using a Predicted-Mean-Vote (PMV) control ventilation system."8th Nordic Symposium on Building Physics in the Nordic Countries 2008 2 (2008) pp.825-832.

2006

Nytsch-Geusen, Christoph, Thilo Ernst, Peter Schwarz, Mathias Vetter, Andreas Holm, Juergen Leopold, Alexander Mattes, Andre Nordwig, Peter Schneider, Christoph Wittwer, Thierry Stephane Nouidui, and Gerhardt Schmidt."Advanced modeling and simulation techniques in MOSILAB: A system development case study."5th International Modelica Conference (2006) pp.63-72.

Nytsch-Geusen, Christoph, Andre Nordwig, Mathias Vetter, Christoph Wittwer, Thierry Stephane Nouidui, and Peter Schneider."MOSILAB: Ein Modelica-Simulationswerkzeug zur energetischen Gebäude- und Anlagensimulation."16. Symposium Thermische Solarenergie (2006).

Nouidui, Thierry Stephane, Christoph Nytsch-Geusen, and Andreas Holm."Validierung der eindimensionalen hygrothermischen Wandmodelle der Modelica-Bibliothek "BuildingPhysicsLibrary"."BauSIM 2006 (2006) pp.144-146.

2005

Nytsch-Geusen, Christoph, Thierry Stephane Nouidui, Andreas Holm, and Wolfram Haupt."A hygrothermal building model based on the object-oriented modeling language Modelica."Ninth International IBPSA Conference (2005).

Nytsch-Geusen, Christoph, Thilo Ernst, Peter Schneider, Mathias Vetter, Andreas Holm, Juergen Leopold, Ullrich Doll, Andre Nordwig, Peter Schwarz, Christoph Wittwer, Thierry Stephane Nouidui, Gerhardt Schmidt, and Alexander Mattes."MOSILAB: Development of a modelica based generic simulation tool supporting modal structural dynamics."4th International Modelica Conference (2005) pp.527-534.