Stark Presentation

7/31/2019 Stark Presentation

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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

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2 0 1 5

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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

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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.com


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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 [email protected]
http://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/mailto:[email protected]:[email protected]:[email protected]://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/http://commercialbuildings.energy.gov/

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