Ralph T. Muehleisen

Principal Building Scientist
- Decision and Information Sciences

Ralph T. Muehleisen is the Principal Building Scientist and the technical lead of the Building Energy Decision and Technology Research (BEDTR) program.

The BEDTR program focuses on the development of tools and technologies to increase the energy efficiency of the buildings and enable the interaction of smart buildings with the smart grid. Dr. Muehlesien is particularly interested in the modeling of building systems, development of new building science measurement and instrumentation technologies, and on development of tools to monetize building related energy, information, and services.

Dr. Muehleisen is an Adjunct Associate professor at the Illinois Institute of Technology, an associate editor for the Journal of Architectural Engineering and the Proceedings of Meetings on Acoustics, a voting member of several ASTM and ASHRAE Technical Committees, chair to the ASHRAE TC 4.7 Data Driven Modeling subcommittee and the vice-chair of the Chicago Chapter of the International Building Performance Simulation Association.

Prior to joining Argonne in 2011, Dr. Muehleisen was an Associate Professor of Civil and Architectural Engineering at the Illinois Institute of Technology and Director of the Architectural Engineering Programs. Dr. Muehleisen is also an internationally recognized expert in the areas of architectural acoustics, physical acoustics and noise control.


  • Fellow of the Acoustical Society of America
  • Institute of Noise Control Engineering Board Certified Noise Control Engineer
  • Board of Directors, Midwest Energy Efficiency Alliance
  • Licensed Professional Engineer, State of Illinois
  • LEED Accredited Professional, Building Design & Construction (LEED AP, BD+C)
  • Chair of ASHRAE TC 4.7 Data Driven Modeling Subcommittee
  • Vice-Chair, Chicago Chapter of IBPSA-USA
  • Member of ASHRAE, ASTM, IBPSA-USA, IEEE, Acoustical Society of America, Institute of Noise Control Engineers, Society of Building Science Educators, American Institute of Steel Construction


  • Muehleisen, Ralph T. 2013. Photoacoustic Sensor. US: US Patent 8,561,454, filed Oct. 28, 2010, and issued Oct. 22, 2013.
  • R.C. Troxell, P. Panikar, R. Muehleisen, R.E. Greenlees, and J.D. Troxell. Apparatus and Method for Sonic Cleaning of an Air Filter for Wheeled and Tracked Vehicles. US Patent Application 2008/0085018 A1, filed Oct 10, 2006.
  • Heo, Yeonsook, Diane J. Graziano, Leah Guzowski, and Ralph T. Muehleisen. 2014. “Evaluation of Calibration Efficacy under Different Levels of Uncertainty.” To Appear in the Journal of Building Performance Simulation.
  • Muehleisen, Ralph T., Yeonsook Heo, Diane J. Graziano, and Leah B. Guzowski. 2013. “Stochastic Energy Simulation for Risk Analysis of Energy Retrofits.” In Proceedings of the 2013 Architectural Engineering National Conference, 2000:902–911. ASCE.
  • Muehleisen, Ralph T. and Silverio Patrizi. 2013. “A New Parametric Equation for the Wind Pressure Coefficient for Low-Rise Buildings.” Energy and Buildings 57 (February): 245–249.
  • Guzowski, Leah B., Diane J. Graziano, Yeonsook Heo, and Ralph T. Muehleisen. 2012. “Testing a Streamlined Project Evaluation Tool for Risk-Conscious Decision Making: The Chicago Loop Energy Efficiency Retrofit Initiative.” In 2012 ACEEE Summer Study on Energy Efficiency in Buildings, 139–151. ACEEE.
  • Heo, Yeonsook, Fei Zhao, Sang Hoon Lee, Jinsol Kim, Godfried A. Augenbroe, Diane Graziano, Leah B. Guzowski, and Ralph T. Muehleisen. 2012. “Scalable Methodology for Energy Efficiency Retrofit Decision Analysis.” In SimBuild 2012. IBPSA-USA.
  • Muehleisen, Ralph T. 2012. “Analysis of a Pressure Equalized Rainscreen Wall as a Coupled Array of Helmholtz Resonators.” In Proceedings of Meetings on Acoustics, 11:45002–45010. ASA.
  • Muehleisen, Ralph T. 2012. “Simple Design Tools for Earth-Air Heat Exchangers.” In SimBuild 2012. IBPSA-USA.
  • Muehleisen, Ralph T. 2011. “Why We Have Two Ears - Take Two: A Revised Experiment on Sound Localization.” In Proceedings of Meetings on Acoustics, 8:25002–25011. ASA.
  • Muehleisen, Ralph T. 2009. “Review of the Implementation and Recent Changes of Several Acoustic Criteria Used in United States Schools.” In Internoise 2009.
  • Muehleisen, Ralph T. 2009. “Why We Have Two Ears - A Hands-on Experiment Comparing Monaural and Binaural Hearing.” Proceedings of Meetings on Acoustics 6 (1) (May): 25001–25009.
  • Muehleisen, Ralph T. and C. Walter Beamer IV. 2009. “Steady State Acoustic Radiosity for the Prediction of Sound Pressure Levels in Enclosures with Diffuse Surfaces.” Noise Control Engineering Journal 57 (3): 244–262.
  • Muehleisen, Ralph T. 2008. “Sound Recordings from the 2007 Emergence of Brood XIII Cicada.” Proceedings of Meetings on Acoustics 2 (1): 10001–10007.
  • Muehleisen, Ralph T. 2008. “Simplified Radiosity for Predicting Sound Levels in Rectangular Enclosures.” INCE Conference Proceedings 117 (1): 973–981.
  • Muehleisen, Ralph T. 2008. “Six Surface Steady State Acoustic Radiosity.” In AEI 2008, 328:55–65. Denver, Colorado, USA: ASCE.
  • Muehleisen, Ralph T. 2007. “A Comparison of the Acoustic Requirements in LEED for Schools and ANSI S12.60.” In Noise-Con 2007, 116:195–204. Institute of Noise Control Engineers.
  • Muehleisen, Ralph T. and C. Walter Beamer IV. 2006. “Steady-State Diffuse Acoustic Radiosity for Sound Level Prediction in Rooms.” In AEI 2006, 21–28. ASCE.
  • Muehleisen, Ralph T. 2005. “Use of the Monte Carlo Method for Uncertainty Analysis of Acoustic Models and Measurements.” INCE Conference Proceedings 114 (1): 1295–1300.
  • Muehleisen, Ralph T., C. Walter Beamer IV, and Brandon D. Tinianov. 2005. “Measurements and Empirical Model of the Acoustic Properties of Reticulated Vitreous Carbon.” Journal of the Acoustical Society of America 117 (2): 536–544.
  • Muehleisen, Ralph T. 2002. “Effects of Common Indoor Air Pollutants on the Speed of Sound.” Acoustics Research Letters Online 3 (4) (October): 118–123.
  • Muehleisen, Ralph T. and C. Walter Beamer IV. 2002. “Comparison of Errors in the Three- and Four-Microphone Methods Used in the Measurement of the Acoustic Properties of Porous Materials.” Acoustics Research Letters Online 3 (4): 112–117.
  • Muehleisen, Ralph T. and David C. Swanson. 2002. “Modal Coupling in Acoustic Waveguides: Planar Discontinuities.” Applied Acoustics 63 (12) (December): 1375–1392.
  • Muehleisen, Ralph T. and Anthony A. Atchley. 2001. “Fundamental Modes of a Constricted Annular Resonator: Theory and Measurement.” Journal of the Acoustical Society of America 109 (2): 480–487.