Building Energy Performance Index (BEPIs)

Transcription

1 Education Sector Energy Manager Strategic Planning Session Building Energy Performance Index (BEPIs) September 19, 2012 Robert Greenwald, P.Eng., MBA SD44 (North Vancouver) Energy Manager

2 Agenda 25 min presentation Purpose Value Frustrations Solutions 15 min discussion Applications 2

3 Purpose 3

4 What is a Building Energy Performance Index (BEPIs) Combines all fuel types into common units (overall energy use) Adjusts for size for buildings by using area to create an index Could bring in additional variables, for example, occupancy (GJ/m2/hour occupancy) 4

5 Why Use a Building Energy Performance Index (BEPIs) Big picture performance How are we doing? Benchmarking How do we compare? Performance monitoring Are we getting better? 5

6 Value 6

7 Internal Benchmarking Identify highest energy using schools (by category) to target further investigation Good application for a review of multiple schools in the same year 7

8 Carbon Neutral Capital Plan (CNCP) Guess which 3 boiler plants were targeted for CNCP funding? 8

9 Total Energy Intensity (egj/m2) 0.80 NVSD Total Energy Intensity - Elementary Schools Avg. Lower Mainland Total BEPI 0.57 egj/m2 Avg. NVSD Total BEPI 0.52 egj/m Electrical - Consumption - egj / m² Fuel Consumption - GJ / m² Average BEPI (egj/m2) Avg. Lower Mainland Total BEPI GJ/m2

10 NVSD Elementary Schools: Energy Benchmarking 2011 Indicates above average

11 Saanich SD Choice of using combined energy vs. by energy type tells you different stories. Have kept things combined for simpler comparison for most people. However, having separate BEPI s by energy type could well lead to better allocated money and effort, within a given school. 11

12 Saanich SD 12

13 External Benchmarking Compare against peers and references How are we doing overall? 13

14 NRCan Benchmarking Equivalent to 0.88 GJ/m2; higher than most BC SD Published in

15 NRCan Energy Survey

16 NRCan Energy Survey

17 Benchmarking with Energy Star Portfolio Manager is a free software NRCan is paying for French translation of the software Scale of 1 to 100 helps energy managers get point across to senior management in a simple number. Canadian Version via NRCan to be launched in 2013 Local experience via LEED EBOM submissions This is mainly a benchmarking tool With 86 primary function property types They track floor area and temperature They do building level regression analysis (not meter level) They don t have capability of BEPIs with other drivers (only floor area) Website: energystar.gov/pmupgrade Source:

18 BEPI (GJ/m2) Area (m2) Comparison to Other School Districts (same year) Lower Mainland School District Benchmarking All Schools - Total Enery Intensity (GJ/m2) Average Total Energy BEPI 0.60 GJ/m2 800, , , , , , , , SD34 Abbotsford SD37 Delta SD41 Burnaby SD44 North Van SD75 Maple Ridge SD39 Vancouver SD35 Langley SD38 Richmond SD36 Surrey Energy Intensity GJ/m2 Avg. BEPI Area (m2)

19 Target Setting Potential target (EMA) HDD 100% HDD 105% HDD 98% HDD 82% Based on Energy Management Assessment (EMA), there is potential for 10-14% savings. Using 13% as a target Equivalent to 0.06 egj/m 2 reduction compared to 4 year average. If this applies equally to Electricity and Fuel, equivalent to savings of 1,250,000 ekwh/yr on a base of 10,500,000 kwh and 9,200 GJ on a base of 77,000 GJ

20 Target Setting - New Schools Judge performance of new schools vs. existing Sutherland Secondary 20

21 NVSD Secondary Schools: Energy Benchmarking 2011

22 2030 Challenge for Energy Performance Challenge: create design strategies for new hospitals that result in 60% less than standard operational energy use. Target 100: in Pacific Northwest, 60% less = 108 KBtu/SF year. (Equivalent to 31.7 kwh/sf) Source:

23 Frustrations 23

24 The Impact of Weather HDD 100% HDD 105% HDD 98% HDD 82% Can 2010 BEPI be used to compare performance going forward?

25 Area Calculation What area to use? Gross area Heated area Source of area value (ministry value?) Portables Other temporary structures Workshops/ garages 25

26 Variability of Use in Schools Other factors make school unstable vs. downtown office. Vs. 26

27 Impact of Community Use # of operating hours not included: Summer school Leased out gym Saturday clubs Sunday church use Daycare 27

28 Renovations May increase ventilation rate 28

29 Propane and Portables Hard to map delivery to use 29

30 Quality of Data Data sources suspect What is most relevant? 30

31 Solutions 31

32 Grouping really helps! Type Elementary Secondary HVAC System Ventilated Unventilated 32

33 Normalized Weather Carry out a regression each year Apply standard HDD ie. Based on a 10 year average ie. Based on a chosen year Developed in PUMA in 2012 and in testing 33

34 Compare Each School vs. Itself Use CUSUM to compare multiple years 34

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38 Compare Each School vs. Itself BEPI Multi Year vs Total CUSUM overall for district 38

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40 Estimate of 10-year cost avoidance Elect $1.5 M Fuel $1.6 M 40

41 Target BEPI for new and existing schools in BC By Region By type of school Our own Target

42 Discussion 1. How have you used your BEPI? 2. How have BEPIs helped you secure senior management support? 3. What challenges have you had creating or using BEPIs? 42

43 Thank you! Robert Greenwald, P.Eng., MBA, President Gilmore Way, Burnaby, BC V5G 4X