NARAGHI HALL 3 rd FLOOR VENTILATION MANAGEMENT IMPROVEMENT BEST PRACTICE AWARD HVAC DESIGN/RETROFIT 2014 CALIFORNIA HIGHER EDUCATION SUSTAINABILITY CONFERENCE SAN DIEGO STATE UNIVERSITY Geng Liu Energy Manager, CSU Stanislaus Brady Nations Regional Manager, Aircuity

Naraghi Hall of Science, 3 rd floor lab spaces  Occupied 2007  Third floor included special lab spaces  Designed for constant 10 ACH, 24/7

Aircuity retrofit project objectives  Implement demand control ventilation  13 lab areas  Implement new hood minimums based on ANSI Z9.5  Minimum flow when hood closed  Cooling & Heating prevented reaching full Z9.5 min  100 FPM Face velocity maintained in all cases  Convert constant volume EF w/ bypass dampers to VFD

Bringing projects to reality  Identify Energy Saving Opportunities  Perform Feasibility Study  Project Fund Availability  Management successfully implements energy saving projects, and savings are put to work on additional future energy projects

Results Reduced Average airflow from 22,100 to13,900 CFM EF speed reduction from Constant 60 Hz to Avg. ~40 Hz Energy 492,000 kWh 492,000 kWh 14,213 Therms 14,213 Therms All From ~ 16,000 Sq. Ft.

Results: Additional benefits of Project  Reduced Noise Level-Indoor  Reduced Noise Level-Outdoor  Significantly reduced fire damper malfunctions & resulting pressure problems  Widened unoccupied temperature deadband

Project Economics Total Cost $190,000 Annual Cost Savings Achieved ($/yr) $63,413 Simple Payback Before Incentive 3.0

Understanding DCV Traditional approach: 10 ACH 24/7 Just in case there’s something there.

Does this room need 10 ACH?

Principle of DCV Continuously measure for airborne contaminants When present: VENTILATE at design levels When not present: Use energy effective level

Example of contaminant measurement

Lab contaminant event

The Aircuity System Continuously monitors for airborne contaminants TVOCs Airborne Particulate CO 2 CO When presents “requests” additional ventilation Always active Not an override

Typical Lab Design showing OptiNet Fume Hood Supply Air General Exhaust Hood exhaust Ventilation Controls OptiNet Sampling Point OptiNet Sensor Suite

Sensor Suite (SST) Houses the critical instruments Located in an equipment room All service work is done here.

ADR 1ADR 2ADR 3ADR 4ADR NMAC 306 CHEM STOCK Supply Air Measurement West Outside Air measurement 310 Instrument 312 Phys. Chem. Instrument 314 Prep. 316 NMR Centralized Sensing System 323 BAL 325 Group study 334 Biotech W. 329 Env. Cab. Supply Air Measurement East 330 Sci. App. 331 Microbiology 332 Biotech Prep. 334 Biotech. E Located in IDF room Monitored Labs Reference points Sensor Suite ADR (typ) ADR : Air Data Router

Questions?

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