Canadian Home Builders Association
Drake Landing Solar Community
May 28, 2010
Drake Landing Solar Community
Okotoks, Alberta
Purpose of Project:
Presentation Outline:
•Technology demonstration
•Model development
•Technology Concept
•Implementation Challenges
•Latest Performance Update
•Replication Discussions
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1-1
The Changing of Seasons
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1-2
Solar Energy – a Locally Available Renewable Energy
Solar Radiation on Slope=Latitude
0.7
Miami
Monthly total solar in GJ
0.6
Toronto
0.5
0.4
0.3
0.2
0.1
0
Jan
Feb
Mar
May – September
April – September
Apr
May
Jun
Jul
Aug Sep
Oct
Nov Dec
100%
96%
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
1-3
Underground Thermal Energy Storage Systems
Aquifer-based system
Borehole-based system
Aquifer thermal energy storage (ATES)
Borehole thermal energy storage (BTES)
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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
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1-5
Simplified System Schematic
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1-6
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
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1-7
BTES Field Top View
Energy Centre
BTES Field
BTES = borehole thermal energy storage
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1-8
Energy Distribution
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Energy Delivery (Air Handler Unit)
Electronically commutated motors
High-efficiency fan coils
Integrated heat recovery ventilators (HRV)
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1-10
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
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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.
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
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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.
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
1-13
Project Non-Technical Challenges
Market structural
Institutional
Legal
Human resources and knowledge
Perceived risk
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1-14
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
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1-15
Performance Monitoring – Monthly Plots (example, Feb 2010)
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1-16
Solar Collectors
Monthly Totals
2000
Incident Solar Energy GJ
1800
Solar Energy Collected GJ
1600
1200
1000
800
600
400
200
Jun-09
May-09
Apr-09
Mar-09
Feb-09
Jan-09
Dec-08
Nov-08
Oct-08
Sep-08
Aug-08
Jul-08
Jun-08
May-08
Apr-08
Mar-08
Feb-08
Jan-08
Dec-07
Nov-07
Oct-07
Sep-07
Aug-07
0
Jul-07
Energy (GJ)
1400
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
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October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
Temperature (°C)
Borehole Thermal Energy Storage
65
BTES Core
No Flow for 4 Hours
60
55
50
45
40
35
30
25
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
1-18
Drake Landing Project Status – Solar Fraction
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1-19
Drake Landing Project Status – House Heating Load
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1-20
Live Performance Update (www.dlsc.ca)
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1-21
Drake Landing Solar Community – July 2007
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1-22
Drake Landing Solar Community – January 2010
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1-23
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
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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
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1-25
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
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal or quotation.
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