Post on 05-Apr-2018
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Pathway to Net-Zero EnergyCommercial Buildings
Gregory B. Stark, P.E.National Renewable Energy Laboratory
UNL Net-Zero Energy Workshop
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Introduction Why Net Zero is Important Can We Get to Zero Energy? Commercial Building Initiative
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Why Net Zero is Important Buildings are the Largest Energy Consumer in the U.S.
40% of primary energy, 72% of electricity, 55% of natural gas
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Commercial Sector Trends Energy use increasing 1.6% per year faster
that energy efficiency improvements
5
10
15
20
25
30
1 9 8 5
1 9 9 0
1 9 9 5
2 0 0 0
2 0 0 5
2 0 1 0
2 0 1 5
2 0 2 0
2 0 2 5
S e c t o
r e n e r g y
( q u a
d s
)
0
5
10
15
20
G
D P ( t r i
l l i o n
$ ) Delivered(site) energy
Total (source)energy
GrossDomesticProduct
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Can We Get to Zero Energy?
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Tremendous Potential in Buildings First Database of Net-Zero Energy Buildings:
zeb.buildinggreen.com
Building LocationFloorArea(ft2)
AnnualPurchased
Energy (kBtu/ft 2)
Aldo Leopold Legacy Center Baraboo, WI 11,900 -2.02
Audubon Center at Debs Park Los Angeles, CA 5,020
Challengers Tennis Club Los Angeles, CA 3,500 -0.0955
Environmental Tech. Center,
Sonoma State
Rohnert Park, CA 2,200 -1.47
Hawaii Gateway EnergyCenter
Kailua-Kona, HI 3,600 -3.46
IDeAs Z2 Design Facility San Jose, CA 6,560 -0.00052
Oberlin College Lewis Center Oberlin, OH 13,600 -4.23
Science House St. Paul, MN 1,530 0
http://localhost/var/www/apps/conversion/current/tmp/scratch13024/zeb.buildinggreen.comhttp://localhost/var/www/apps/conversion/current/tmp/scratch13024/zeb.buildinggreen.comhttp://localhost/var/www/apps/conversion/current/tmp/scratch13024/zeb.buildinggreen.com7/31/2019 Stark Presentation
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A Pathway to Net Zero Energy:The Commercial Building Initiative
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Goal Market-ready, net-zero energy commercial buildings no later than 2025
Public-Private Partnerships Drive efficiency gains Promote improved technology Accelerate commercialization of advanced building technologies
Commercial Building Initiative
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CBI: Technology Push vs. Market Pull
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Commercial Building Energy Alliances
Retailer Energy Alliance (February 2008)
32 members representing 2.28B sq. ft. Commercial Real Estate Energy Alliance (April 2009)
39 members representing 5.24B sq. ft. Hospital Energy Alliance (April 2009)
21 members representing 319M sq. ft. Higher Education Energy Alliance (forming Steering
Committee now; launch expected Q1 2010)
State and Municipal Energy Alliance (2010)
Informal associations among building owners and operatorswho want to reduce energy consumption
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Key Alliance Activities Technology Procurement Projects
LED Lighting Rooftop HVAC Parking Garage Lighting
Supplier Summits HVAC, Refrigeration, and Controls, Jan 08 & 09 Lighting and Controls, May 09
Technology Evaluation Building owner directed research
and screening
Efficiency Standardization and Tools Commercial Lighting Solutions HVAC Solutions/Central Commercial Refrigeration Solutions
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An Example
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ZEB involves Prudent Choices Reduce Loads
Envelope and orientation to reduce loads Insulation, air barrier & windows
Envelope and orientation to meet loads Daylighting, passive solar heating, and natural ventilation
Lighting design Daylighting
Plug loads Design vs. owner loads
Match Equipment to Loads Climate-specific HVAC designed for the remaining loads
Make Sure the Building Works Design quality in, and Commissioning Constant Evaluation Keep It Simple Choose Site Specific Renewable Generation Carefully
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Energy & Cost Optimization
Starting Point
Minimum CostPoint
Cost Neutral Point
~3,000 Simulations
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Optimization Result A Building Design that:
Satisfies the owners business criteria (e.g., positive NPV on a 3-year lifecycle cost basis)
Meets or exceeds energy savings objectives
(e.g., uses 50% less energy than a 90.1-2004 compliant building)
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Closing Thoughts Zero is possible Zero takes a coordinated effort with the owner,
architect, and engineering team The little things make the difference in getting to zero
(as you get to zero, small items become significant) The owner needs to set measurable goals and
communicate these goals to the design team The solution is not bigger supplies
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Thanks!Commercial Building Initiativecommercialbuildings.energy.gov
NRELs Commercial Buildings Research Projects www.nrel.gov/buildings/commercial.html
Greg Stark
Team Lead, National Accounts Project Advanced Commercial Buildings ResearchNational Renewable Energy LaboratoryGreg.Stark@nrel.gov
http://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/mailto:Greg.Stark@nrel.govmailto:Greg.Stark@nrel.govmailto:Greg.Stark@nrel.govhttp://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/