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- 1. Tom Hootman, AIA, LEED AP BD+C David Okada, PE, LEED AP Shanti Pless, LEED APRNL, Director of Sustainability Mechanical Engineer NREL, Commercial Buildings Research Group
- 2. 1. Review trends for achieving net zero energy buildings2. Adopt key practices in delivering net zero energy projects3. Overcome cost, technology, and perception barriers4. Transform the delivery process to mainstream net zero energy buildings
- 3. Introduce net zero energy approach6 best practices for net zero energy 1. Performance-based procurement 2. Predicting energy use 3. Passive architecture and load reduction 4. Low energy active systems 5. Integrated renewable energy 6. Zero energy operation
- 4. “In five years, anyone would be crazy to design abuilding that isn’t green. But I’ll bet you that ... in fiveyears [it] won’t just be about green buildings. It willbe about zero net energy buildings, and abouttechnologies to increase the amount of excess energybuilding owners can sell on the grid.”- Former President Bill Clinton, Greenbuild Keynote Address, November 2007
- 5. WHO IS WORKING ONNET ZERO ENERGY?
- 6. HOW IS NET ZEROENERGY DEFINED?
- 7. Net Zero Site Energy BuildingNet Zero Source Energy BuildingNet Zero Energy Emissions BuildingNet Zero Energy Cost Building
- 8. WHAT TYPE OFPROJECTS CANACHIEVE NET ZEROENERGY?
- 9. WHAT TYPE OFPROJECTS CAN’TACHIEVE NET ZEROENERGY?
- 10. A: Within the Building FootprintB: (A +) Within the SiteC: (A /B +) Imported RenewablesD: (A/B/C +) Off-Site or Purchased RECs
- 11. HOW MANY NETZERO ENERGYBUILDINGS ARETHERE?
- 12. 1 1 1 1 2 1 1 16 1 1 1 1 New Buildings Institute Getting to Zero 2012 Status Update: A First Look at the Costs and Features of Zero 2 Energy Commercial Buildings (March 2012)
- 13. 13 11 1K-5K 5K-10K 10K-25K 19 5 25K-50K 8 50K-100K 4 >100KNew Buildings InstituteGetting to Zero 2012 Status Update: A FirstLook at the Costs and Features of ZeroEnergy Commercial Buildings(March 2012)
- 14. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 15. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 16. I want a green buildingDesign a LEED <rating> buildingDesign a building to use 30% lessenergy than ASHRAE 90.1-2004Design a building to use less than25,000 BTU/sqftDesign a net zero energy building
- 17. Project-Centered Delivery
- 18. 1. Mission Critical Safety LEED Platinum Energy Star2. Highly Desirable 800 staff Capacity 25kBTU/ft2/year Substantial Completion by 20103. If Possible Net zero design approach Visual displays of current energy efficiency National and global recognition and awards
- 19. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 20. New Buildings InstituteEnergy Performance of LEED for NewConstruction Buildings (March 2008)
- 21. “G1.2.2. Neither the proposed building performance nor thebaseline building performance are predictions of actualenergy consumption or costs for the proposed design afterconstruction. Actual experience will differ from thesecalculations due to variations such as occupancy, buildingoperation and maintenance, weather, energy use notcovered by this procedure, changes in energy rates betweendesign of the building and occupancy, and the precision ofthe calculation tool.”– ASHRAE Standard 90.1
- 22. PREDICTIVE MODELING (Absolute energy target) VERSUSCOMPLIANCE MODELING (Percent better than ASHRAE 90.1)
- 23. CONCEPT DESIGN CONSTRUCTION OPERATIONSCHARRETTE MODEL AS-DESIGNED MODEL LEED MODEL + BASELINE AS-BUILT MODEL OPERATIONS MODEL
- 24. Monthly EUI (kBtu/ft2) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.5 4.0 Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Model RSF PV Cooling Heating Lighting Plug Loads Data Centerare demand side values Mechanical SystemsNote: The annual EUI values
- 25. 4.5 4.0 3.5 3.0 PV Data Center Mechanical Systems 2.5Monthly EUI (kBtu/ft2) Plug Loads Lighting 2.0 Heating Cooling 1.5 1.0 0.5 0.0 RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV Model Model Model Model Model Model Model Model Model Model Model Model Note: The annual EUI values are demand side values
- 26. 4.5 36 The PV system is sized 4.0 32 for an annual EUI of 35.1 kBtu/ft2. 3.5 28 3.0 24 PV Data Center Annual EUI (kBtu/ft2) 2.5 20 Mechanical Systems Plug LoadsMonthly EUI (kBtu/ft2) Lighting 2.0 16 Heating Cooling 1.5 12 Model Annual EUI RSF Annual EUI 1.0 8 0.5 4 0.0 0 RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV Model Model Model Model Model Model Model Model Model Model Model Model October November December January February March April May June July August September Note: The annual EUI values 2010 2010 2010 2011 2011 2011 2011 2011 2011 2011 2011 2011 are demand side values
- 27. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 28. Passive Design Efficient Systems Renewable Energy Integrated Delivery
- 29. 1 60 ft. Wide Office Wings2 Interior Thermal Mass 13 Thermal Labyrinth4 Daylighting5 Natural Ventilation6 Low Window to Wall Ratio7 Transpired Solar Collectors8 Open Workplace 4 5 8 2 7 6 3
- 30. Energy driven form Conventional form 115,000 SF 65,000 SF
- 31. <30% >70%Window to Wall Ratio Window to Wall Ratio
- 32. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 33. Ambient lighting with daylight sensors for 25 fc 6 watt task lightAmbient daylight 50 fc
- 34. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 35. 5% 10% 15% 20%4.6 9.3 13.9 18.6 watt/ft 2
- 36. <75 <37 kBtu/ft2/yr kBtu/ft2/yr <25 <18 kBtu/ft2/yr kBtu/ft2/yrBased on Boulder, Colorado solar data.
- 37. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 38. Operators Occupants Executives IT ManagersFood Service HR Managers
- 39. Coordinate with Commissioning Coordinate with O&M PlanPlan Energy Information SystemAnalyze and Report Energy Data
- 40. Manage Plug and Process Loads Educate and Train Occupants Plan for Future Changes Celebrate Success!
- 41. 4.5 4.0 3.5 3.0 PV Data Center Mechanical Systems 2.5Monthly EUI (kBtu/ft2) Plug Loads Lighting 2.0 Heating Cooling 1.5 1.0 0.5 0.0 RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV RSF PV Model Model Model Model Model Model Model Model Model Model Model Model Note: The annual EUI values are demand side values
- 42. SAVE A SEAT FOR YOUR DESIGN- BUILD TEAM?
- 43. 1 Performance-based 4 Low energy active procurement systems2 Predicting energy use 5 Integrated renewable energy3 Passive architecture 6 Zero energy operation and load reduction
- 44. Tom Hootman, AIA, LEED AP BD+CRNL, Director of Sustainabilitytom.hootman@rnldesign.comDavid Okada, PE, LEED AP BD+Cdaveokada@gmail.comShanti Pless, LEED APNREL, Commercial Buildings Research Groupshanti.pless@nrel.gov www.facebook.com/NetZeroEnergyDesign www.nrel.gov/rsf

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