Can there be a truly Green Building or Eco-city without a Data-based approach?

1. 3rd US-China Green Energy Conference 20100622, Suzhou, China Can there be a truly Green Building or Eco-city without a Data-based approach? QINGPENG WEI, Ph.D. Building Energy Research Center Tsinghua University, China

2. General Information Mission Devote to develop energy efficient and environmentally responsible buildings and cities in accordance with national and international energy and environmental targets through innovation. BERCBuilding Energy Research Center Established in March, 2005; Sprouted from Institute of Built Environment, THU

3. Solar thermal panel Plant roof Insulated wall and window Light well and Ventilation chimney PV panel Green house Double-skin façade, External ventilation Self cleaning glass Double-skin façade, internal ventilation Vacuum glazing Sunlight Collect system PCM risen floor Double-skin facade, natural ventilation Vertical Exterior Shading Low-E Triple Glazing Horizontal Exterior Shading Man-made Wet land Controllable aperture Low Energy Demo Building: An Integrated Platform

5. Can there be a truly Green Building or Eco-city without a Data-based approach?

6. Owens (USGBC), Frankel, Turner (NBI), 2008

7. Typical Multi Family Bldg. in Beijing C. 26 floors, 2003 Split unit • 5 floors, 1981 • Split unit E. 26 floors, 2005, Centralized AC system B.18 floors, 1996, Split unit D. 26 floors, 2004, Unitary AC

8. Measured Electricity Use for AC kWh/m2.year

9. Case2: AC in Summer in Res. Bldg. • Measured Electricity Use of Air-Conditioners in Each Household in a multi family apartment in Beijing

10. Case study：Campus Buildings B A

11. Observations on A Campus in Beijing Average: 82 Average: 64 Average: 30 Electricity of Campus Buildings (A), kWh/m2.a Buildings with Fan Only Buildings with Split AC Units Buildings with Centralized AC System

12. Observations in Campus in Philadelphia Electricity of Campus Buildings (B), kWh/m2.a Excluding District Cooling Plant Served with District Heating / Cooling (DHC) System

13. Metered Cooling Consumption Data Cooling Consumption in Buildings in a summer week W/m2 1 2 Buildings in US Buildings in BJ

14. Reheat Fighting with Cooling • A typical Air Handling Process in a US bldg: VAV + Reheat

15. Think of it…

16. Weather Operation & Maintenance Building Envelop Occupant Behavior Indoor Environment Conditions Building Equipment Influencing Factors on Total Energy Use in Buildings Building Performance Energy Use By Prof. Yoshino

17. EUI per capita vs. EUI per GFA million tce Source: International Energy Outlook 2008, EIA DOE, 2008

18. Evolution of Energy Use in Bldg. Per GFA Per capita Source: International Energy Outlook 2008, EIA DOE, 2008

19. Global Ecological Footprint Source: A Living Planet, WWF Report, 2005

20. Data-based Approach • Goal Setting • Maintaining the real energy use in urban consumption sector within a certain figure • Policy Making • Designed and conducted based on analyzing and understanding the real energy use data • Evaluated after implementation through measured or surveyed real energy use data on which the policy is supposed to influence

21. Thank you! qpwei@tsinghua.edu.cn