EWRE Seminar Series Presents:
Monday, April 24, 2017, 12:00 – 1:00 pm
“How Much Carbon Dioxide Do People Emit and Who Cares?”
National Institute of Standards and Technology
100 Bureau Drive, MS8600
Gaithersburg, Maryland USA
Bio: Dr. Andrew Persily is the Chief of Building Environment Division at the National Institute of Standards and Technology (NIST). Since receiving his M.A. and Ph.D. degrees from Princeton University in 1979 and 1982, he has performed research into indoor air quality and ventilation. His work has included the development and application of measurement techniques to evaluate airflows and indoor air contaminant levels in a variety of building types. These evaluation procedures include tracer gas techniques for measuring air change rates and air distribution effectiveness, contaminant concentrations measurements, and envelope airtightness. He has contributed to the development and application of multi-zone airflow and contaminant dispersal models. He is currently Chair of Standard on Design of High-Performance Green Buildings of the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). He was also serving as a Vice-President of ASHRAE, Chair of ASTM Subcommittee on Air Leakage and Ventilation Performance, and Vice-Chair of subcommittee on Indoor Air Quality. He was named an ASTM Fellow and an ISIAQ Fellow in 2002, and an ASHRAE Fellow in 2004.
Abstract: Indoor carbon dioxide (CO2) concentrations have been used in the fields of building ventilation and indoor air quality (IAQ) for decades. Specific applications include the estimation of ventilation rates, control of outdoor air ventilation rates based on indoor CO2 as an indicator of occupancy levels, and use of CO2 as an IAQ performance parameter. All of these applications require values for the CO2 generation rates of the occupants of the space or building being considered. Human CO2 generation rates depend on their level of physical activity (described by met rates) as well as their sex, age, and body size. Historically and currently, these rates have been based on formula and data from the literature that are many decades old. In many cases, a single value for an adult on the order of 0.3 L/min is used independent of individual characteristics that are known to impact CO2 generation. The fields of human metabolism and exercise physiology have been studying human energy use, oxygen consumption and CO2 generation for many decades, but that knowledge has not been incorporated by the IAQ community. This talk will describe the known dependencies of CO2 generation rates on occupant characteristics and present a calculation method for estimating these generation rates based on these concepts. This method is more robust and up-to-date than previously established calculation procedures and will support more accurate values of CO2 generation rates for use in ventilation and IAQ analyses.