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Canadian Home Builders Association Drake Landing Solar CommunityMay 28, 2010 PowerPoint PPT Presentation


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Canadian Home Builders Association Drake Landing Solar CommunityMay 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 CommunityMay 28, 2010

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Canadian home builders association drake landing solar community may 28 2010

Canadian Home Builders Association

Drake Landing Solar CommunityMay 28, 2010


Drake landing solar community okotoks alberta

Drake Landing Solar CommunityOkotoks, Alberta

  • Presentation Outline:

  • Technology Concept

  • Implementation Challenges

  • Latest Performance Update

  • Replication Discussions

  • Purpose of Project:

  • Technology demonstration

  • Model development


The changing of seasons

The Changing of Seasons


Solar energy a locally available renewable energy

Solar Energy – a Locally Available Renewable Energy

May – September 100%

April – September96%


Underground thermal energy storage systems

Underground Thermal Energy Storage Systems

Borehole-based system

Borehole thermal energy storage (BTES)

Aquifer-based system

Aquifer thermal energy storage (ATES)


Drake landing solar community btes

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


Simplified system schematic

Simplified System Schematic


Canadian home builders association drake landing solar community may 28 2010

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


Btes field top view

BTES Field Top View

Energy Centre

BTES Field

BTES = borehole thermal energy storage


Energy distribution

Energy Distribution


Energy delivery air handler unit

Energy Delivery (Air Handler Unit)

Electronically commutated motors

High-efficiency fan coils

Integrated heat recovery ventilators (HRV)


Drake landing project status

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


Canadian home builders association drake landing solar community may 28 2010

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.


Canadian home builders association drake landing solar community may 28 2010

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.


Project non technical challenges

Project Non-Technical Challenges

Market structural

Institutional

Legal

Human resources and knowledge

Perceived risk


Performance monitoring good data is key

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


Performance monitoring monthly plots example feb 2010

Performance Monitoring – Monthly Plots (example, Feb 2010)


Solar collectors monthly totals

Solar CollectorsMonthly Totals


Borehole thermal energy storage

Borehole Thermal Energy Storage


Drake landing project status solar fraction

Drake Landing Project Status – Solar Fraction


Drake landing project status house heating load

Drake Landing Project Status – House Heating Load


Live performance update www dlsc ca

Live Performance Update (www.dlsc.ca)


Canadian home builders association drake landing solar community may 28 2010

Drake Landing Solar Community – July 2007


Drake landing solar community january 2010

Drake Landing Solar Community – January 2010


Replication discussions

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


Replication discussions1

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


Questions and discussion

Questions and Discussion

Bill Wong, P.Eng.

Assistant Vice-President – Technical Lead

Renewable Energy and Climate Change

SAIC Canada

Ottawa, ON Canada

[email protected] Tel: (613) 683-3281


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