Geothermal Heating at the Home of Val Prest
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Transcript of Geothermal Heating at the Home of Val Prest
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Groton Local Energy Seminar Series # 7:
Geothermal Energy to Heat Our New Home
09-Apr-08By Lynwood Valentine Prest, P.E.
Presentation available at: http://grotonlocal.org/seminar.shtml
Email: [email protected]
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Val and Wendy Prest’s New Home in Groton, MA
• Heavily-insulated• Uses Geothermal
Energy for its HVAC• Designed and
decorated by the home owners
• Builder: Shawn Boyd– Boyd Building, LLC,
Jaffrey, NH
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TIGHTNESS & INSULATION• Critical, no matter what fuels & HVAC equipment used• Insulate roof or attic - R=30 or better. Ours is R=50. • Insulate exterior walls, doors and windows - R=20 or better. Ours is
about R=27.• Insulate around penetrations through roofs, attics & exterior walls
with spray-on foam• Around doors, windows, pipes, ducts, electrical items, etc.• NO fireplace so no chimney and flue• Insulate sills atop foundations with spray-on urethane foam• Obtain lowest possible Energy Star Rating. They measure air
leakage rates.• 0 to 100 w/ max at 85 to obtain Energy Star rating• Our house came in at 44
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Other Factors
• VENTILATION– Necessary because house is so tight against
air leaks• LIGHTING & APPLIANCES
– Energy Star to minimize electrical usage and heat generation
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HVAC with Water Filters
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Geothermal Water Piping
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Ven Mar Energy Economizer
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Geothermal Heating System• Design: Water Energy Distributors, Inc., Hampstead, NH
– Uses their standing-well concept, a single water well that serves for both domestic use and geothermal energy.
• Furnished & installed by Bill Wenzel Heating and Air Conditioning, Inc., Merrimack, NH– Tranquility system with a 40-gallon water storage tank and a
separate 80-gallon water heater tank– Ven Mar energy recovery ventilator– 240V ultraviolet germicidal lamp– 2 separate zone-damper panels.
• Installation included:– Ductwork and grilles– Insulation of exposed ductwork.
• COST, including installation: $33,985
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Water Well• Single well for both geothermal energy and domestic use
– Water line splits just inside the house.– One line goes to the heat exchanger of the geothermal system– Other line goes to the domestic water system
• Heat exchanger utilizes 35 gpm of water to obtain heat and cooling energy– Incoming water stays about 49 to 50 degrees F all year
• Well, originally designed for a depth of 700 ft., stopped at 300 ft. upon encountering a 400 gpm aquifer
• COST= $10,505
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Economic Analysis - Installation -
• Cost for geothermal– Cost of system: $33,985– Cost of well: $10,505– Total cost: $44,490
• Cost of conventional alternative:– Cost of water well: $4,500– Cost of oil/gas-fired HVAC system: $19,000– Total cost: $23,500
• Additional cost for geothermal: $20,990
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Other Decision Factors• Entire lot (less than 1/4 acre) is within the 100
foot buffer zone from the lake’s edge.• We did not want oil on the property, and it is
expensive anyway. • We have little to no room for a large propane
gas tank. • Coal and wood fired systems are labor intensive,
messy on cleanup, and needs waste disposal.• Electrical resistance heating is too inefficient and
expensive to operate.
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Actual Operational Costs for Electricity
Month of Bill Amount of Bill *8/2007 23.149/2007 124.09
10/2007 168.2911/2007 155.5212/2007 155.251/2008 258.192/2008 346.383/2008 342.73 TOTAL 1,598.04
Supplier: Groton Electric Light
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Comparison with Operational Cost for Conventional Oil Alternative
• Heating with oil:– Estimated gals. per month:253.3– Est’d $ per month at $3.46/gal: $876
• Non-heating electricity per mo.: $124• Total est’d for oil + electric per mo.: $1,000• Total est’d for oil + electric per yr.: $5,871
• Est’d total electric for geothermal/yr.: $2,278• Net savings per year: $3,593• Time to recover excess capital costs: 6 years