Portrait of Craig Wray

Craig Wray

Commercial Building Systems Group
Lawrence Berkeley National Laboratory
1 Cyclotron Road MS 90R2000
Berkeley CA 94720
Office Location: 90-2024A
(510) 486-4021

Craig Wray, P.Eng. has more than 30 years of experience as a consulting engineer and scientist addressing energy, airflow, pollutant transport, and commissioning issues in buildings. As a Mechanical Engineer at Berkeley Lab, his current efforts focus on air-handling system experiments, modeling these systems and their interactions with other building components, developing related diagnostic methods, and assessing the benefits and risks of improvements. He currently serves as the DOE Better Buildings Alliance Laboratory Technology Team lead.

At ASHRAE, Mr. Wray is the Chair of SPC 215P "Method of Test to Determine Leakage Airflows and Fractional Leakage of Operating Air‐Handling Systems". Recently, he served as Vice-Chair of the "High Performance Air-Handling Systems for Buildings Except Low-Rise Residential Buildings" Multidisciplinary Task Group (MTG.HPAS), which he cofounded in 2012. He has also served on many society-level and technical committees including as Chair of the Technical Activities Committee, Head of the "Load Calculations and Energy Requirements" Section, member of the Standards Committee, and Chair of the "Ventilation Requirements and Infiltration" Technical Committee. He also served as Co-Chair for the American Council for an Energy-Efficient Economy's 2010 Summer Study on Energy Efficiency in Buildings.

Mr. Wray has Master of Science and Bachelor of Science degrees in mechanical engineering from the University of Manitoba in Canada, specializing in heat transfer, fluid flow, and machine design, and is a registered professional engineer in Manitoba and British Columbia. He is a recipient of ASHRAE's Distinguished Service Award and DOE's Outstanding Mentor Award, as well as two Berkeley Lab Outstanding Performance Awards.

In the past, he has carried out a wide variety of multiyear research projects encompassing both residential and commercial building performance, and has published almost 100 reports and papers related to these activities.

Building Energy and Heat Transfer Research

Mr. Wray has directed several field tests and simulation efforts to demonstrate the energy savings potential and thermal performance benefits of air-handling system sealing, duct static pressure control, and the use of "cool" coatings on roofs and ducts for commercial buildings. Some of these efforts have supported enhancements for the U.S. Department of Energy flagship energy simulation tool (EnergyPlus) and new requirements for California's Title 24 energy code. His technical efforts as part of the federal "Green the Capitol Initiative" produced recommendations that could substantially reduce energy use in HVAC and power plant systems.

He has also developed numerous computer models and tools for assessing building performance. Much of his work has supported national-scale energy efficiency and technology transfer activities such as the Canadian R-2000 and Energuide for Houses programs. In particular, he has integrated models into public and proprietary tools that industry has used to generate performance ratings and retrofit plans for roughly 800,000 houses. He has also developed a programmatic guide for the nascent residential commissioning industry, with emphasis on assessing performance impacts of airflow- and refrigerant-related deficiencies on thermal and ventilation distribution systems.

Building Airflow and Contaminant Transport Research

Mr. Wray has developed several computer models for assessing airflow and contaminant transport in buildings. His efforts in the late 1980's to combine complex airflow and contaminant transport simulation tools and to identify a reliable, efficient solution algorithm for multizone simulations have led to models that are now used by industry for fire and smoke control analyses, and by researchers to assess building operation strategies such as the response to unintended chemical and biological material releases. Related work has supported evaluations of building envelope airtightness diagnostics and CO2-based demand-controlled ventilation systems. A simpler model that he developed combines heat and mass transfer models to predict nitrogen dioxide release and transport inside houses.

Mr. Wray's efforts have also resulted in improved metrics and diagnostics for assessing building component leakage, HVAC system flows, ventilation air distribution, and pollutant retention time. He has evaluated diagnostic tool uncertainty using laboratory and field tests, simulations, and statistical analyses. Some of this work directly supported industry standards such as ASHRAE 62 and 136, and CGSB 51.71 and 149.10.

This publications database is an ongoing project, and not all Division publications are represented here yet.



Wray, Craig P.. Computer Simulation of the Transport of Soil Gas, Indoor Air, and Atmospheric Air into Subslab Venting Systems In Report to the Canada Mortgage and Housing Corporation. G.K. Yuill and Associates Ltd., 1991.


Wray, Craig P., and Grenville K. Yuill. Development of Models to Characterize Soil Gas Flow and Radon Entry into Basements In 5th International Conference on Indoor Air Quality and Climate. Vol. 3. Toronto, ON,, 1990.
Wray, Craig P., and Grenville K. Yuill. Dynamic Multi-Compartment Modelling: The Transport of Radon and its Decay Products Indoors In International Symposium on Radon and Radon Reduction Technology. Atlanta, GA, 1990.

Portrait Photos

Portrait photographs are available in various sizes for downloads. Right click on the links and choose "Save Link As..." option from the context menu.