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Pathway to Net-Zero Energy Commercial Buildings Gregory B. Stark, P. E. National Renewable Energy Pathway to Net-Zero Energy Commercial Buildings Gregory B. Stark, P. E. National Renewable Energy Laboratory UNL Net-Zero Energy Workshop

Introduction • Why Net Zero is Important • Can We Get to Zero Energy? Introduction • Why Net Zero is Important • Can We Get to Zero Energy? • Commercial Building Initiative

Why Net Zero is Important • Buildings are the Largest Energy Consumer in the 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

Commercial Sector Trends • Energy use increasing 1. 6% per year – faster that Commercial Sector Trends • Energy use increasing 1. 6% per year – faster that energy efficiency improvements

Can We Get to Zero Energy? Can We Get to Zero Energy?

Tremendous Potential in Buildings • First Database of Net-Zero Energy Buildings: zeb. buildinggreen. com Tremendous Potential in Buildings • First Database of Net-Zero Energy Buildings: zeb. buildinggreen. com Location Floor Area (ft 2) Annual Purchased Energy (k. Btu/ft 2) 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 Energy Center Kailua-Kona, HI 3, 600 -3. 46 IDe. As Z 2 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 Building Aldo Leopold Legacy Center

A Pathway to Net Zero Energy: The Commercial Building Initiative A Pathway to Net Zero Energy: The Commercial Building Initiative

Commercial Building Initiative • Goal – Market-ready, net-zero energy commercial buildings no later than Commercial Building Initiative • 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

CBI: Technology Push vs. Market Pull CBI: Technology Push vs. Market Pull

Commercial Building Energy Alliances Informal associations among building owners and operators who want to Commercial Building Energy Alliances Informal associations among building owners and operators who want to reduce energy consumption • Retailer Energy Alliance (February 2008) – 32 members representing 2. 28 B sq. ft. • Commercial Real Estate Energy Alliance (April 2009) – 39 members representing 5. 24 B sq. ft. • Hospital Energy Alliance (April 2009) – 21 members representing 319 M sq. ft. • Higher Education Energy Alliance (forming Steering Committee now; launch expected Q 1 2010) • State and Municipal Energy Alliance (2010)

Key Alliance Activities • Technology Procurement Projects – LED Lighting – Rooftop HVAC – 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

National Accounts Companies from the private sector working with national laboratories to achieve significant, National Accounts Companies from the private sector working with national laboratories to achieve significant, unprecedented building energy savings. • DOE national labs teamed with 23 companies to: – Build one new building at 50% less energy than Standard 90. 1 – Retrofit at least one existing building at 30% less energy • Labs provide technical assistance to biggest names in retail, commercial real estate, and financial sectors

An Example An Example

ZEB involves Prudent Choices… • Reduce Loads – – • • • Lighting design ZEB involves Prudent Choices… • Reduce Loads – – • • • Lighting design – • Envelope and orientation to meet loads – • Envelope and orientation to reduce loads Plug loads » Insulation, air barrier & windows » Daylighting, passive solar heating, and natural ventilation » Daylighting » Design vs. owner loads Match Equipment to Loads – Climate-specific HVAC designed for the remaining loads – Design quality in, and Commissioning Make Sure the Building Works Constant Evaluation Keep It Simple Choose Site Specific Renewable Generation Carefully

Energy & Cost Optimization Starting Point Cost Neutral Point Minimum Cost Point ~3, 000 Energy & Cost Optimization Starting Point Cost Neutral Point Minimum Cost Point ~3, 000 Simulations

Optimization Result • A Building Design that: – Satisfies the owner’s business criteria • Optimization Result • A Building Design that: – Satisfies the owner’s 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)

Closing Thoughts • Zero is possible • Zero takes a coordinated effort with the 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

Thanks! Commercial Building Initiative commercialbuildings. energy. gov NREL’s Commercial Buildings Research Projects www. nrel. Thanks! Commercial Building Initiative commercialbuildings. energy. gov NREL’s Commercial Buildings Research Projects www. nrel. gov/buildings/commercial. html Greg Stark Team Lead, National Accounts Project Advanced Commercial Buildings Research National Renewable Energy Laboratory Greg. Stark@nrel. gov