Considerations for the Design and Energy Modeling of New Commercial Buildings with Increased Ventilation Rates

The 30% more ventilation than ASHRAE 62.1 design criterion has been a long-considered option for design teams pursuing LEED certification to attempt improved indoor air quality for occupants. Emerging research is now discussing the potential cognitive benefits of increasing ventilation rates even further above code minimum levels. This paper outlines key design and modeling questions for practitioners to consider when asked to evaluate the impacts of increased ventilation targets. This paper explores setting performance goals, expected indoor carbon dioxide (CO2) values, occupancy patterns, energy use, and system sizing implications. A case study example building in Seattle is used to provide building simulation examples and insights.