Case 19

Estimating real-time infiltration for use in residential ventilation control 

[Lisa Ng, Stephen M. Zimmerman, Jeremy Good, Brian Tool, Steven Emmerich, Andrew Persily (2019)]

Minimum outdoor air ventilation rates specified in standards such as ASHRAE Standard 62.2 are generally based on envelope airtightness, building floor area, geographical location, and number of occupants. To meet ventilation requirements in practice, simple on/off controls and operating schedules are most commonly used to maintain the required ventilation rate. Ideally, minimum outdoor ventilation rates should account for unintentional leakage through the building envelope, or "infiltration." ASHRAE Standard 62.2-2016 allows for an infiltration credit, which reduces the required mechanical ventilation. However, infiltration rates vary based on the indoor-outdoor temperature difference, wind, and system operation 

Case Study Data [ZIP 1.5 kBs]

Ng, L. , Zimmerman, S. , Good, J. , Toll, B. , Emmerich, S. and Persily, A. (2019), Estimating real-time infiltration for use in residential ventilation control, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.2046

Ng L., Zimmerman S, Good J, Toll B, Emmerich S., Persily A. Estimating real-time infiltration for use in residential ventilation control. Indoor and Built Environment. 2020;29(4):508-526. doi:10.1177/1420326X19870229