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Energy and Environment Directorate

Chitra Nambiar

Chitra Nambiar

(509) 371-6267


Chitra joined PNNL in October 2018. She has over 12 years of experience working in the building energy analysis, sustainability and building architecture industries. Prior to PNNL she provided technical support for the development and maintenance of the California building energy code- Title 24, performed other code readiness and support activities for the California Energy Commission and public utilities in California. She has also performed whole building energy modeling analysis for various clients and has supported the development testing and training of the compliance software- CBECC-Com. Her areas of interest include building energy analysis, building energy code development, research and analysis for zero energy building code, lighting and daylighting design and data analysis of building energy data. Chitra lives with her family in the San Francisco Bay area and works out of her home office.

Research Interests

  • Whole Building Energy Analysis
  • Large- Scale simulation for Building codes and standards
  • Research and analysis for Net Zero Building Energy Code Lighting and Daylighting Analysis.

Education and Credentials

  • M.S - Sustainable Architecture, New Jersey Institute of Technology
  • B Arch - College of Engineering, Trivandrum, India.

Affiliations and Professional Service

  • Member - IBPSA
  • Member - ASHRAE
  • Registered Architect - Indian Council of Architecture.

Awards and Recognitions

  • Best Energy Performance award, LowDown Showdown Competition at ASHRAE-IBPSA SimBuild 2016 conference.

PNNL Publications


  • Hart R., J. McNeill, M.M. Tillou, C. Cejudo, C. Chandrasekharan Nambiar, H. Nagda, and D.E. Maddox, et al. 2021. Expanded Energy Credits in Energy Codes: Technical Brief. PNNL-31572. Richland, WA: Pacific Northwest National Laboratory. Expanded Energy Credits in Energy Codes: Technical Brief


  • Chandrasekharan Nambiar C., and R. Hart. 2020. "Simple Building Calculator." In 2020 Building Performance Analysis Conference and SimBuild, September 29-October 1, 2020, (Virtual), 423-430. Atlanta, Georgia:ASHRAE. PNNL-SA-150212.
  • Franconi E.M., J. Lerond, C. Chandrasekharan Nambiar, D. Kim, M.I. Rosenberg, and J. Williams. 2020. "Opening the Door to Grid-Interactive Efficient Buildings with Energy Codes." In ACEEE 2020 Summer Study on Energy Efficiency in Buildings, August 17-21, 2020, Virtual, Online, 10-117 - 10-130. Washington Dc:American Council for an Energy-Efficient Economy. PNNL-SA-151838.
  • Hart R., C. Chandrasekharan Nambiar, J. Williams, and M. Reiner. 2020. "An Energy Calculator for Simple Commercial Buildings." In ACEEE Summer Study on Energy Efficiency in Buildings, August 17- 21, 2020. Virtual, Online, 5-207 - 5-218. Washington Dc:American Council for an Energy-Efficient Economy. PNNL-SA-152109.

Energy and Environment

Core Research Areas