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Energy Savings with EnergyEdge

Energy Savings with EnergyEdge

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Energy Savings with EnergyEdge

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  1. Energy Savings with EnergyEdge Brandi McManus, Energy Services Manager – MR&D

  2. Energy Indicators • Simple – from statistics • Benchmarks • Indices • Corrected – for special energy uses • Site Survey • Customized – close look at facility • Manual Calculations • Modeling

  3. Benchmark vs. Indices Benchmark – A standard by which something can be measured or judged Indices – a quantity whose variation over a period of time measures the change in some phenomenon.

  4. Benchmarks/Indices • Historical • Comparative • Process vs Facility • Facility vs Portfolio • Performance Based • Practice Based Meaningful Metrics are Key

  5. Benchmarks can be used to… • Compare Facilities • Set Goals • Communicate to customers

  6. Benchmarks and Indices • Simple goal: Is there an energy opportunity? • Things to ALWAYS remember • Baseline – What happened that year? • Weather – Hotter or cooler? • Data – How complete and reliable?

  7. A Comparison • Sample: Office Building using € 120 000 per year and 9 290 m2 • Other buildings in Area • Building A: office € 210 000 18 580 m2 • Building B: office € 60 000 3 716 m2 • Building C: hospital € 560 000 13 935 m2 • Building D: office € 90 000 9 290 m2 Which buildings do you compare to?

  8. Some Types of Benchmarks and Indices • Energy Cost Index (ECI) – Cost/Area • Energy Utilization Index (EUI)- BTU’s/area • Electric Consumption – kWh/Area • Load Factor – Average Demand/Peak Demand • Energy Intensity – BTU’s/use

  9. Energy Cost Index (ECI) and Energy Utilization Index (EUI) • Low ECI and Low EUI - The building is energy efficient and has normal utility rates • Low ECI and High EUI - The building is energy inefficient and has low utility rates • High ECI and Low EUI - The building is energy efficient and has high utility rates • High ECI and High EUI - The building is energy inefficient and has normal utility rates Sample Building 12,92 €/m2 734 553 BTUs/m2 Building A: office 11,3 €/m2 642 734 BTUs/m2 Building B: office 16,15 €/m2 918 192 BTUs/m2 Building C: hospital 40,19 €/m2 2 203 660 BTUs/m2 Building D: office 9,69 €/m2 550 915 BTUs/m2

  10. Electric Consumption Electric Consumption – kWh/Area Sample Building 215 kWh/m2 Building A: office 188 kWh/m2 Building B: office 269 kWh/m2 Building C: hospital 646 kWh/m2 Building D: office 161 kWh/m2

  11. Load Factor Load Factor = kWh / (time X kW) High – Used during unoccupied periods Example: Annual Consumption: 2 000 000 kWh Annual Demand: 700 kW Load Factor:

  12. Energy Intensity • Energy Intensity: The ratio of energy consumption to a measure of the demand for services • Segment • Number of buildings • Total floor space • Floor space-hours • Number of employees The more factors you incorporate…the more confidence in results

  13. Energy Intensity by Building Type

  14. Why Energy Intensity? • Data available • Trusted sources • Credible • International

  15. Practice Problem: A Comparison • Sample: Office Building using € 120 000per year and 9 290 m2 • Other buildings in Area • Building A: office € 210 000 18 580 m2 • Building B: office € 60 000 3 716 m2 • Building C: hospital € 560 000 13 935 m2 • Building D: office € 90 000 9 290 m2

  16. Problem: Continued

  17. Summary • Types of Energy Efficiency Indicators • Energy Cost Index (ECI) – Cost/Area • Energy Utilization Index (EUI)- BTU’s/area • Electric Consumption – kWh/Area • Load Factor – Average Demand/Peak Demand • Energy Intensity

  18. Key Points • Know what you are comparing • Know where your indices is coming from • Use trusted data • Use more than one index or benchmark if possible • For Energy Intensity, use more than one factor

  19. Now you can • Define energy benchmark and indices • List major types of energy efficiency indicators • Compare a facility to a benchmark to determine if using more or less energy than benchmark • Define Energy Intensity and why it is used

  20. For more information • EUI and ECU – www.energy.gov • Load Factor - http://www.nbpower.com/en/customers/business/energy/load/load.aspx • Energy Intensity – • http://www.iea.org/ • http://www.carbontrust.co.uk/ • http://www.sei.ie/energymap/index.asp?locID=795&docID=-1