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Committee presses for data as HVAC tweaks add dehumidification measures, commissioning review underway
Summary
Committee heard detailed updates on HVAC performance: the building was designed without a separate dehumidification system, staff are adding sensors and resequencing controls (including occasional boiler reheating) to control humidity, and the commissioning agent is advising efficiency adjustments; members requested trending reports and engineering justification.
Committee members spent an extended portion of the meeting on HVAC performance, commissioning and warranty questions after contractors and the commissioning agent reported on sensor readings and proposed sequencing changes.
Project representative Scott and the chair explained that the building's original design relied on air conditioning to provide baseline dehumidification rather than a separate dehumidification system. Because some sensor readings have shown elevated humidity during unoccupied periods at duct-mounted sensors, staff plan to add more interior sensors, monitor trending for at least a week and adjust sequencing. The transcript records the team considering limited reheating (using the boilers) as an added layer of dehumidification in specific conditions; project staff said the engineer and commissioning agent have been consulted and will provide formal direction.
Committee member Clark pushed for clearer engineering justification and energy-use analysis of any reheating strategy. "I just wanna see some logic," Clark said, asking the engineer to attend a future meeting or provide documentation. The chair and Scott said commissioning agent Steve Krasinski has suggested tweaks to improve dehumidification efficiency and that additional sensor data and trending reports will be provided for committee review.
Members also discussed warranty timing: staff said warranty periods have already begun and Downs is working on recommendations to extend or otherwise secure coverings through shoulder seasons; staff said they expect to resolve warranty language at a future meeting when recommendations are in writing.
Next steps: project staff will install additional sensors, provide trending reports and written engineering/commissioning guidance for the committee, and return with a recommended warranty approach for formal review.
