Seminar 49 -- Learned from BAS Data: The Most Common Operational Problems in HVAC Systems, and the Energy Savings from Fixing Them

2023 ASHRAE Annual Conference

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Recent large-scale projects have analyzed BAS and fault diagnostic data from over 1,500 buildings in the US, to understand what operational faults are the most commonly occurring, how persistent the faults are, and their impacts on building performance. One study examined monitoring data from over 60,000 unique pieces of equipment (air-handling units, VAV boxes, and rooftop units) over 12-24 months of operation to gather information. Another study looked at 151 buildings, and implemented corrective action in 69 of them, to assess energy saving potential. This seminar presents the summarized results of these landmark studies.