Variable Exhaust Flow ControlsProcess
Codes and Standards Enhancement (CASE) Report
The Statewide CASE Team is requesting feedback on the 2019 Title 24, Part 6 Draft CASE Reports. The CASE Report presents pertinent information that supports the code change proposal. Please email feedback to email@example.com. You may also submit written comments to the Energy Commission. See the agenda for Energy Commission pre-rulemaking workshop (available here) for instructions on how to submit comments to the Energy Commission’s docket.
Laboratories and process facilities require specially designed exhaust systems that allow for safe release and dispersion of harmful chemicals into the ambient outdoor environment. The performance of laboratory and process facility exhaust is highly dependent on exhaust stack design and fan specification. The type of exhaust system will impact how well the “re-entrainment into the building air intakes and contamination of building entrances, exits, and adjacent buildings” are avoided (McIntosh, Dorgan, & Dorgan, 2001). Presently, there are no requirements for performing dispersion analysis during the design of lab exhaust systems. This raises concerns for the safety of lab occupants and occupants of nearby buildings. There are numerous existing standards that address this concern, which gives the opportunity for the state of California to mandate accordance with one of these standards to ensure occupant safety.
In addition, there are currently no requirements for the power demand of laboratory and process facility discharge exhaust systems in California. Furthermore, there is no existing baseline for laboratory or process facility exhaust power, as these are currently listed as exempt process loads. Because there are no existing requirements, some exhaust systems currently being specified in the state of California are consuming more energy than necessary. This means that adding requirements for exhaust power will result in these systems being more efficient than they would have been otherwise, therefore creating significant savings opportunities for laboratory and process facility exhaust systems.
This measure is proposed to ensure that laboratories meet the discharge requirements in ANSI Z9.5 and to limit the power consumption of laboratory and process facility exhaust systems. The measure will revise the existing prescriptive fan power equation requirements to include a limited allowance for process discharge exhaust fan power. If the prescriptive fan power limit cannot be met, numerous pathways towards compliance will be provided including control by a rooftop anemometer or control by a contaminant sensor. This code change will affect prescriptive requirements for covered processes for new construction, additions and alterations. In practice, the proposed measure will impact the selection and implementation of laboratory exhaust systems.
Request for Feedback
The Statewide Utility Team encourages participation in the CASE Report development process through the submission of data—both primary sources and references to existing data. We are requesting data on areas such as energy savings, costs, market impacts, industry practices, barriers to code compliance, etc. from stakeholders. The data will inform the energy savings estimates, cost-effectiveness analysis, compliance and enforcement, and market impacts that will be presented in CASE Reports.
Do you have feedback or data to share? Send us an email at firstname.lastname@example.org.
California Statewide Utility Codes and Standards Program
This program is funded by California utility customers and administered by Pacific Gas and Electric Company, Southern California Edison, San Diego Gas and Electric Company, Southern California Gas Company, Sacramento Municipal District, and Los Angeles Department of Water and Power in preparation for the California Energy Commission’s Codes and Standards Buildings Advocacy.