Why Care About Building Energy Performance?

2. Why Care About Building Energy Performance? • Aside from building energy increasing? • Ignoring performance ratings is choosing to fly fairly blind — staying at the “dumb” end of the “dumb and dumber” scale • Performance ratings are an evaluation, quickly, and not an investigation

6. New Construction has been a problem for 50 years, increasing carbon footprint • 2003 CBECS data with malls, kBtu/sq-ft-yr weighted means, higher source energy EUIs in newer buildings • CBECS data show same pattern with each survey year, life-cycle influences are shown

7. Basic Energy Benchmarking (Performance) Info • Go to TC 7.6 website (shown on title slide previously) • Select Program Activities at bottom • Chicago 2006, Seminar 17, first presentation • Atlantic City 2002, Seminar 41, first two presentations

8. Current ASHRAE High-Performance Protocol Project • “ASHRAE needs to provide guidance regarding the measurement and reporting of the performance of new and existing [commercial] buildings . . . .” • “ . . . to further the development of building energy performance standards.” • “Measuring and Reporting the On-site Performance of Buildings . . .”

9. ASHRAE STANDARD 105 1984 to now • BSR / ANSI / ASHRAE Standard 105-1984 (RA99) covers measurement and expression of building energy performance at a basic level, with suggested optional extensions • Standard 105-[2007?] is a major revision and has been submitted for publication. It extends the coverage of energy performance measurement and expression, and comparison of building energy performance against others • The nature and level of performance comparison requires some performance “standard” and requires or intrinsically offers some evaluation

10. Standards of Comparison • Minimum prescriptions or best practice levels (Stds 90.1, 90.2, 189P, LEED) • Self-reference, e.g., past and future • Ad-hoc building populations • Representative populations, e.g., CBECS, RECS for USA and CEUS for CA

11. 2007 Applications HandbookEnergy Comparisons using CBECS • Chapter 35, energy management, 3 tables on commercial buildings • Based on 2003 CBECS micro-data without malls • About 50 building types • Site energy use indexes for mean and percentiles 10, 25, 50, 75, and 90 • Electricity and cost indexes at same detail

12. Commercial Buildings Energy Consumption Survey, CBECS • Latest survey micro data available = 2003, next is 2007 (released in 2010?) • Publicly available government reports and data on EIA website • Nationally representative sample, with fairly complicated cluster sampling frame • Different versions have been available, ~5,000 records • Not including imputation flags, there are ~350 data parameters • Data seem to get better each time

13. CBECS and CEUS, some important differences

14. Basic EUI Statistics kBtu/sq-ft per yr

15. Floor Area Distributions, Sq Ft

16. Week Schedule, hr/week open

17. Worker Density workers per 1,000 Sq-ft

18. Density of PCs PCs per 1,000 Sq-ft

19. Rough-cut, Incomplete Regression Models, weighted

20. Not done fishing yet