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Canadian Home Builders Association Drake Landing Solar Community May 28, 2010

Canadian Home Builders Association Drake Landing Solar Community May 28, 2010. Drake Landing Solar Community Okotoks, Alberta. Presentation Outline: Technology Concept Implementation Challenges Latest Performance Update Replication Discussions. Purpose of Project:

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Canadian Home Builders Association Drake Landing Solar Community May 28, 2010

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  1. Canadian Home Builders Association Drake Landing Solar Community May 28, 2010

  2. Drake Landing Solar Community Okotoks, Alberta • Presentation Outline: • Technology Concept • Implementation Challenges • Latest Performance Update • Replication Discussions • Purpose of Project: • Technology demonstration • Model development

  3. The Changing of Seasons

  4. Solar Energy – a Locally Available Renewable Energy May – September 100% April – September 96%

  5. Underground Thermal Energy Storage Systems Borehole-based system Borehole thermal energy storage (BTES) Aquifer-based system Aquifer thermal energy storage (ATES)

  6. Drake Landing Solar Community (BTES) • First solar seasonal storage community in North America • First in world greater than 90 percent solar fraction • Reduction of 5 tonnes greenhouse gas per home per year • Energy efficient single family homes (52 homes) Okotoks, Alberta, Canada

  7. Simplified System Schematic

  8. Solar Thermal Collectors • 798 single-glazed solar thermal collectors • 2,300 m2 collector area • Mounted at 45 pitch • 1.6 megawatts thermal power • Glycol / water heat transfer fluid • Separate solar domestic hot water (DHW) supply system

  9. BTES Field Top View Energy Centre BTES Field BTES = borehole thermal energy storage

  10. Energy Distribution

  11. Energy Delivery (Air Handler Unit) Electronically commutated motors High-efficiency fan coils Integrated heat recovery ventilators (HRV)

  12. Drake Landing Project Status Fully operational since July 1, 2007; Energy system is working well and meeting expectations. Newsletter issued Sept 2009 Live performance report web site May 2010 www.dlsc.ca Calls from all different countries for site tours and visits; People constantly asking if there are more homes for sell; Homebuyers chose Okotoks over Calgary because of DLSC project; Homebuilders continuing the green building path (Sterling Homes, Lifestyle Homes); Residents live in a close-knit community (BBQs, summer solstice party) - Dawn Heffernan, Environment and Sustainability Coordinator

  13. Technical and Construction Challenges • Roof space for solar collectors • Need large roof area for solar collectors; • Concerns in changing the house roof line; • Separation of DHW and space heating collectors. • Garage design and construction • Ground settlement; • Roof truss tolerances; • Roof angle for solar collection. • Collector installation • Tight space between collectors; • Schedule; • Steep slope.

  14. Technical and Construction Challenges • District energy service line connection • District loop piping has to be in before homes are built; • Service line access; • House foundation design. • Shallow and deep utility services • Limited space available; • Need for 4-party trench; • District line compatibility w other services. • Air handler design • Low temperature distribution; • Integrated air handler and HRV.

  15. Project Non-Technical Challenges Market structural Institutional Legal Human resources and knowledge Perceived risk

  16. Performance Monitoring – Good Data is Key • Daily download • Automated process with alert / error messaging • Window environment common programming elements (eg. CYGWIN) • Data stored in Microsoft SQL Server

  17. Performance Monitoring – Monthly Plots (example, Feb 2010)

  18. Solar CollectorsMonthly Totals

  19. Borehole Thermal Energy Storage

  20. Drake Landing Project Status – Solar Fraction

  21. Drake Landing Project Status – House Heating Load

  22. Live Performance Update (www.dlsc.ca)

  23. Drake Landing Solar Community – July 2007

  24. Drake Landing Solar Community – January 2010

  25. Replication Discussions Economies of Scale 250 – 500 units or larger Integrated Energy Systems for Communities Integration with heat pump? Requires less collectors, larger borehole spacing, larger borehole field area, requires heat pump, operating at lower storage temperature GHG impact may be higher or lower depending on local generation mix Development Density and Land Use Better opportunities for higher density and mixed development

  26. Replication Discussions Buildings with cooling loads – even better opportunity Further reduce the number of collectors May work well with unglazed collectors, roof membrane or asphalt collectors (lower cost than glazed collectors) Key is to maintain energy balance in the underground thermal energy exchange medium Several studies with ATES with solar or waste heat from biogas CHP

  27. Questions and Discussion Bill Wong, P.Eng. Assistant Vice-President – Technical Lead Renewable Energy and Climate Change SAIC Canada Ottawa, ON Canada bill.wong@saiccanada.com Tel: (613) 683-3281

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