Gen AI in Business - Global Trends Report 2024.pdf
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2. 2 Air changes per hour as the unoccupied minimumLaboratories often operate with large amounts of bypass air added at the roof level to increase the volume of the exhaust plume based on standard practice rather than engineering analysis. Typical UCI lab operating at 4/2 with brief calls for additional ventilation only when required Increasing exhaust stack height allows for the reduction of plume velocity, this reduces the amount of bypass air required, saving fan energy. Bypass Air Stack Height Reduced air change rates and CFM delivered to the labs results in fan, and chilled water savings of 50% and reduces the need for reheat to near zero. Stack heights are extended 4-10 feet providing the maximum possible reduction in bypass air. At the same time VFD drives and control software is added to exhaust motors (if not already present)