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.
Colum 1 +
Colum 2 +
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

1991

Wray, Craig P., and G.K. Yuill and Associates Ltd.."Building Materials as a Source of Radon: Computer Simulation of Indoor Radon Concentrations." (1991).

Wray, Craig P., and G.K. Yuill and Associates Ltd.."SMOKESIM: Computer-Aided Analysis of Smoke Control Systems: Multizone Airflow and Smoke Transport Simulation - Source Code Documentation."ASHRAE (1991).

Wray, Craig P.."Computer Simulation of the Transport of Soil Gas, Indoor Air, and Atmospheric Air into Subslab Venting Systems."Report to the Canada Mortgage and Housing Corporation (1991).

Wray, Craig P., and G.K. Yuill and Associates Ltd.."Preliminary Investigation Concerning the Impact of Subslab Ventilation on Radon Entry Rate, Soil Temperature, and Energy Consumption, 1991." (1991).

Yuill, Grenville K., Marc R. Jeanson, and Craig P. Wray."Simulated Performance of Demand-Controlled Ventilation Systems using Carbon Dioxide as an Occupancy Indicator."ASHRAE Transactions 97.Part 2 (1991) 963-968.

1990

Wray, Craig P., and Grenville K. Yuill."Development of Models to Characterize Soil Gas Flow and Radon Entry into Basements."5th International Conference on Indoor Air Quality and Climate 3 (1990) 537-542.

Wray, Craig P., and Grenville K. Yuill."Dynamic Multi-Compartment Modelling: The Transport of Radon and its Decay Products Indoors."International Symposium on Radon and Radon Reduction Technology (1990).

Yuill, Grenville K., and Craig P. Wray."Overview of the ASHRAE TC 4.7 Annotated Guide to Models and Algorithms for Energy Calculations Relating to HVAC Equipment."ASHRAE Transactions Vol. 96.Part 1 (1990).

Wray, Craig P.."Development and Application of a Multizone Airflow and Contaminant Dispersal Analysis Microcomputer Program for Simulating Radon and Radon Progeny Transport and Accumulation in Soils and House with Basements."Department of Mechanical Engineering Master of Science (1990).

Wray, Craig P., and G.K. Yuill and Associates Ltd.."Development of a Microcomputer Program to Simulate the Transport and Accumulation of Radon Gas and Its Progeny in Houses." (1990).

1989

Wray, Craig P., and Grenville K. Yuill."An Annotated Guide to Models and Algorithms for Energy Calculations Relating to HVAC Equipment."Report to the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (1989).

Yuill, Grenville K., and Craig P. Wray."A Microcomputer Program for Evaluating the Performance of Buildings Equipped with Ventilator Window/Baseboard Heating Systems."SESCI Energy Solutions for Today Conference (1989).

Yuill, Grenville K., and Craig P. Wray."Sampling Errors in Short Term Measurements of Average Radon Levels in Houses."SESCI Energy Solutions for Today Conference (1989).

Wray, Craig P., Gordon M. Comeau, Grenville K. Yuill, and G.K. Yuill and Associates Ltd.."Performance Evaluation of a Laminar Airflow Window / Humidity-Controlled Air Inlet / Baseboard Heater Ventilation and Heating System."Report to Willmar Window Industries (1989).

1988

Wray, Craig P., and Grenville K. Yuill."Development of a Microcomputer Program for Predicting Residential Nitrogen Dioxide Concentrations."International Conference on Indoor and Ambient Air Quality (1988).

1987

Yuill, Grenville K., and Craig P. Wray."An Approach to the Verification of Simple Building Energy Analysis Computer Programs."ASHRAE Transactions 93.Part 1 (1987).

Wray, Craig P., and G.K. Yuill and Associates Ltd.."Design of Test Procedures for BESA – Phase 1 – Preliminary Work."Report to the National Research Council (1987).

Wray, Craig P., and G.K. Yuill and Associates Ltd.."Design of Test Procedures for BESA – Test Procedures and Specifications."Report to the National Research Council (1987).