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Benchmarking to Improve Building Performance

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  1. Benchmarking to Improve Building Performance Kristin Heinemeier, Ph.D., P.E. Technical Director Brooks Energy & Sustainability Lab Presentation to the Texas Energy Partnership September 8, 2004

  2. What is Benchmarking? • Question: • How well is my building performing? • Answer: 42 • Next question: • Compared to what? • Next question: • What should I do about it?

  3. What is Benchmarking? • A tool to help support decisions. • Is my building using too much energy? • How “good” are my buildings? • Where are my energy costs going? • How am I doing on reaching my goals? • Which of my buildings need improved maintenance? • Does my building need retrofits? • How much should I be willing to spend to do a retrofit?

  4. What is Benchmarking? • Defining Building Performance • Comparing it to… • Past performance • Trending • Expectations • Target setting and trending • Diagnostics • Other buildings • Internal benchmarks • External benchmarks

  5. Building Performance Metrics • kWh/month • Ccf/day • kBtu/year • dollars • kBtu/sqft • normalized for: • number of days in reading • weather • operating hours • segregated for other drivers: • electric heating, data centers, kitchens

  6. Benchmarking on Past Performance • Collect and Calculate metrics • Trend them over time

  7. Benchmarking on Expectations • Setting targets

  8. Comparing to Other Buildings: the Ideal Benchmark • Comparing to comparable buildings: • climate/location • size • building type • activities • end uses • occupancy • operation and maintenance • vintage • Normalized for anything you don’t have control over.

  9. Comparing to Other Buildings: Internal Benchmarks • Annual Energy Use

  10. Comparing to Other Buildings: Internal Benchmarks • Annual Energy Intensity

  11. Comparing to Other Buildings:External Benchmarks (CBECS) • DOE Commercial Building Energy Use Compilation and Survey • Southern Census Region, Annual kBtu / sqft: • Education 67.8 • Food Sales 204.9 • Health Care 174.2 • Outpatient Health Care 80.7 • Lodging 101.9 • Mercantile 65.4 • Retail 71.1 • Enclosed and Strip Malls 61.8 • Office 90.7 • Public Assembly 68.2 • Religious Worship 28.9 • Service 157 • Warehouse and Storage 32.9 • Other 105.3 • (www.eia.doe.gov/emeu/cbecs)

  12. Comparing to Other Buildings:External Benchmarks (CBECS)

  13. Comparing to Other Buildings:Energy Star Labeled Buildings • Recognition for “good” buildings • Separate rankings for different types of spaces: • offices, K-12 schools, hospitals, hotels, supermarkets • Describe simple building characteristics • zip code, sqft, occupants, computers, op. hours • Enter energy use • Receive a “score” based on percentile • www.energystar.gov

  14. Comparing to Other Buildings:Energy Star Labeled Buildings

  15. Energy Star Portfolio Manager • Track energy use and costs • Benchmark with other similar bldgs. (calculate score) • Benchmark with your other bldgs. • Set and track baselines and targets • Track improvements • www.energystar.gov

  16. How to do Benchmarking • Collect energy data. • Calculate and chart metrics for individual buildings. • Chart trends in individual buildings and groups of buildings. • Define baselines and targets for individual buildings or groups of buildings. • Periodically evaluate your performance and goals.

  17. Thank you! • Questions? • source: www.nisd.net