Published on February 25, 2014
NREL Parking Garage Performance Review: Achieving 90% Energy Savings in a Parking Structure Shanti Pless NREL Commercial Buildings Research Group March 28, 2013 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.
Design Solution—Metrics for Performance • Parking Spaces o o 1,806 total spaces 90 preferred spaces for carpooling and vanpooling, 90 preferred spaces for low-emitting vehicles, 36 electric vehicle charging stations • Renewable Energy Ready o 1.13 MW PV (net zero energy for RSF complex) o 158 kBtu/space/yr, designed 90% energy reduction versus ASHRAE Standard 90.1-2007 • Energy Performance o • Lighting and Daylighting are the key strategies to ensure successful performance 2
Design Solution—Structure Elevation: Aluminum perforated panels optimized by daylight model • 40% openness • North, east, and west positioning Top floor PV roof, Jennifer Scheib, NREL 3
Design Solution—Structure Interiors: • Light concrete but no paint on ceiling or columns • Slab and beam versus flat slab Interior perspective, Jennifer Scheib, NREL 4
Design Solution—Structure Interiors: Atrium staircase leading to bus shelter Atrium and bus shelter, Dennis Schroeder, NREL 5
Design Solution—Systems • 0.05 W/ft2 LPD CBEA specification was used for reference when reviewing lighting fixture submittals • Lights are only on when needed o Occupancy sensors (OS) o Photocells (PS) LED fixture, Jennifer Scheib, NREL Lighting plan, courtesy ME Group and RNL 6
Design Solution—Systems Light well images, Dennis Schroeder, NREL 7
Design Solution—Systems Light well, Dennis Schroeder, NREL 8
Design Solution—Systems Light well, Dennis Schroeder, NREL 9
Design Solution—Systems Light well, Dennis Schroeder, NREL 10
Design Solution—Systems Light well, Dennis Schroeder, NREL 11
Design Solution—Systems Light well, Dennis Schroeder, NREL 12
Design Solution—Systems Light well, Dennis Schroeder, NREL 13
Energy Performance Predicted versus Measured, Summer 2012 14
Lighting Energy Performance Last 48 Hours 15
EVCS Energy Performance Last 48 Hours 16
Getting it all to work • Ensure photocells are placed appropriately o o Hard to control to 1 FC… A single global photocell with local zone configuration is now our preferred method • Be prepared to fine tune occupancy controls o o 30 seconds to 50%, 2 minutes to off works well Do occupancy sensors sense the right things? – Full coverage? – Sensor shields to minimize false ON 17
Discussion About Innovation and Replication • Process innovation o o Use performance-based procurement (energy goal with performance incentives) Require integrated design with energy modeling, starting in the predesign phase, to maximize efficiency feature early • Design innovation o o o o Focus on structure first (structure type, perimeter configuration to maximize high daylight, bay width, structure depth, finishes, colors, percent fly ash) Achieve a low LPD with good nighttime cutoff Implement a lighting control scheme that improves occupant experience in terms of aesthetics and safety Reduce need or time of use for elevators, heat trace, ventilation, miscellaneous loads • Result: Cost-competitive, energy-efficient, beautiful garage with carefully considered neighborhood interface 18
Resources Available at: www.nrel.gov/sustainable_nrel/buildings_garage.html • Low-Energy Parking Structure Design Guide • DOE High-Efficiency Parking Structure Lighting Specification • Energy-Goal-Based Building Procurement Webinar: Achieving 90% Energy Savings in a Parking Structure • NREL Parking Garage Fact Sheet: • NREL Feature News Story 19
Thank you for your time Questions? And then the tour! Shanti Pless: email@example.com
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