Subterranean Heat Storage for Greenhouses · Introduction Why did we build a Subterranean Heat...

Subterranean Heat Storage for GreenhousesThe Invermere ExperienceThe Invermere Experience

““In our every deliberation we must consider the impact of our decIn our every deliberation we must consider the impact of our decisions on the next seven isions on the next seven generationsgenerations””

The Great Law of the Iroquois ConfederacyThe Great Law of the Iroquois Confederacy

Presented byPresented by

Dale Wilker, Dale Wilker, Future FarmerFuture FarmerGroundswellGroundswellInvermere, B.C.Invermere, B.C.

IntroductionIntroduction

Why did we build a Subterranean Heat Storage (SHS) Why did we build a Subterranean Heat Storage (SHS) greenhouse?greenhouse?What is a SHS greenhouse?What is a SHS greenhouse?SHS greenhouse designsSHS greenhouse designsAnnualized GeoAnnualized Geo--Solar heating designSolar heating designGreenhouse constructionGreenhouse constructionMonitoring resultsMonitoring resultsOur community supportOur community supportWhat's next?What's next?

Why did we build a Subterranean Heat Why did we build a Subterranean Heat Storage (SHS) Greenhouse?Storage (SHS) Greenhouse?


Global WarmingGlobal Warming


Food Security - Healthy Food


Peak OilPeak Oil

What is a SHS greenhouse?What is a SHS greenhouse?

• Doesn’t use fossil fuels for heating or cooling

• Focuses on storing excess unwanted heat gain

• Uses the subterranean mass for that heat storage

• Glazing oriented to capture winter sun for heating

• All non-south-facing walls are insulated

• Designed to minimize summer heat gain

• Uses passive methods to exhaust excess heat

What is a SHS greenhouse?What is a SHS greenhouse?

Heat Storage Strategies

Passive Heat Storage •Radiant solar heat transferred to internal mass•Heat re-radiates into greenhouse during cooler periods•Inefficient method of heat transfer

Active Heat Storage•Solar heated air or water used as heat transfer medium•Heat transfer medium actively distributed through pipes or ducts•Pipes or ducts placed in the soil below greenhouse•Heat is then conducted to the surrounding soil•More efficient storage and transfer method

SHS greenhouse designsSHS greenhouse designs

Our Key Design ConsiderationsOur Key Design Considerations

Partner with school boardPartner with school boardGrow people firstGrow people firstGrow healthy organic foodGrow healthy organic foodEncourage community involvementEncourage community involvementDemonstrate alternative energy strategiesDemonstrate alternative energy strategiesDemonstrate rainwater harvestingDemonstrate rainwater harvestingDemonstrate compostingDemonstrate compostingFully accessible facilityFully accessible facilityMultiMulti--function facilityfunction facility


The Victorian GreenhouseThe Victorian Greenhouse


The Bubble GreenhouseThe Bubble Greenhouse


The Underground GreenhouseThe Underground Greenhouse


The Solar Cold Climate GreenhouseThe Solar Cold Climate Greenhouse


The Subterranean Heating & Cooling GreenhouseThe Subterranean Heating & Cooling Greenhouse

SHS greenhouse designsSHS greenhouse designsAnnualized GeoAnnualized Geo--SolarSolar

Annualized GeoAnnualized Geo--Solar heating designSolar heating design

AGS benefitsAGS benefits Captures excess greenhouse heatCaptures excess greenhouse heat Stores Stores moremore excess heat for cooler periodsexcess heat for cooler periods Concrete floors: ease of cleaningConcrete floors: ease of cleaning

fully accessiblefully accessiblewater recapturewater recapture

Demonstrate alternative energy strategiesDemonstrate alternative energy strategies Demonstrate rainwater harvestingDemonstrate rainwater harvesting Low cost distribution and storage systemLow cost distribution and storage system Low maintenance systemsLow maintenance systems

Greenhouse ConstructionGreenhouse Construction

Monitoring ResultsMonitoring ResultsAverage soil temperatures 4 ft below slabAverage soil temperatures 4 ft below slabJuly 2009July 2009 13 C13 CSeptember 2009September 2009 25 C25 CJanuary 2010January 2010 4 C4 CSeptember 2010September 2010 27 C27 CJanuary 2011January 2011 6 C6 C

Average soil temperatures 1 ft below slabAverage soil temperatures 1 ft below slabJuly 2009July 2009 20 C20 CSeptember 2009September 2009 29 C29 CJanuary 2010January 2010 2 C2 CSeptember 2010September 2010 30 C30 CJanuary 2011January 2011 4 C4 C

Indoor tempsIndoor temps LowsLows HighsHighsJuly 2009July 2009 7 C7 C 29 C29 CSeptember 2009September 2009 10 C10 C 63 C63 CJanuary 2010January 2010 --12 C12 C 22 C22 CSeptember 2010September 2010 8 C8 C 42 C42 CJanuary 2011January 2011 --9 C9 C 25 C25 C

Our Community SupportOur Community Support

Google Google ““Invermere Community GreenhouseInvermere Community Greenhouse””

Partnered with SD6 on the projectPartnered with SD6 on the projectAlmost 300 individuals and businesses helpedAlmost 300 individuals and businesses helpedStudents participated in all phases of the projectStudents participated in all phases of the projectKK--12 schools use greenhouse to teach horticulture12 schools use greenhouse to teach horticultureCOTR runs sustainable courses through greenhouseCOTR runs sustainable courses through greenhouseFirst Horticulture 101 course to start this yearFirst Horticulture 101 course to start this year

WhatWhat’’s Nexts Next

Greenhouse ImprovementsGreenhouse ImprovementsSeal up exterior glazing envelopeSeal up exterior glazing envelopeBuild more beds in contact with slab/soilBuild more beds in contact with slab/soilAdd internal retractable shade cloth systemAdd internal retractable shade cloth systemAdd internal retractable insulation blanketAdd internal retractable insulation blanket


What we would do differentWhat we would do different

Create a more air tight envelopeCreate a more air tight envelopeOrient glazing to be perpendicular to winter sunOrient glazing to be perpendicular to winter sunInsulate side wallsInsulate side wallsBuild it for half the costBuild it for half the cost


ResourcesResources

www.greenershelter.orgwww.greenershelter.orgwww.sunnyjohn.com www.sunnyjohn.com (Solar Greenhouses)(Solar Greenhouses)www.gardengoddessenterprises.comwww.gardengoddessenterprises.comGoogle Google -- GroundswellGroundswell

Subterranean Heat Storage for Greenhouses · Introduction Why did we build a Subterranean Heat...

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