Introduction to Geothermal Comfort Systems
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Transcript of Introduction to Geothermal Comfort Systems
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Introduction toGeothermal
Comfort Systems
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Defining “Geothermal” Energy• Dictionary definition
– Relating to the internal heat of the earth• The Earth acts as a giant solar collector, absorbing
approximately 50% of the energy emitted by the Sun.• Air temperatures may fluctuate as much as 50F above
and below the annual average. However, only a few feet below the surface, the changes in earth temperatures are much less severe.
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Heat Pumps• Heat pumps “move” energy from one location to
another, instead of creating heat by burning fossil fuels, such as a gas furnace does. -- (like your refrigerator).
• Geothermal Heat Pumps use the earth or well water to provide heating, cooling and hot water for your home.
• A geothermal heat pump “moves” energy to/from the ground, eliminating the outdoor equipment associated with ordinary heat pumps or air conditioners.
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The Basic Ground Source Heat Pump System
• The earth loop is placed in the ground either horizontally or vertically, or it can be placed in a pond.
• Water and anti-freeze is circulated through the pipe, transporting heat to the heat pump during the heating mode and away from the heat pump during the cooling mode.
• The heat transfer takes place inside the heat pump in a water-to-refrigerant heat exchanger.
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Energy Source• During the heating season, the earth serves as a heat
source. (HE - Heat of extraction)
• During the cooling season, the earth serves as a heat sink. (HR - Heat of rejection)
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Heat Pump Operation• Geothermal heat pumps consist of four circuits:
– Distribution circuit• The system that distributes the conditioned air or
water solution throughout the home or building and returns it to the unit.
– Refrigerant circuit• A sealed and pressurized circuit of refrigerant
including compressor, expansion valve, water-to-refrigerant heat exchanger(s), air coil, reversing valve. The refrigerant is either R-22 or R-410A.
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Heat Pump Operation• Geothermal heat pumps consist of four
circuits:– Ground loop circuit
• The piping system buried in the ground has fluid that is circulated by pumps to and from the geothermal unit.
– Hot water circuit• Domestic water can be heated in a geothermal unit
with a device called a desuperheater. A piping connection is made from the geothermal unit to the water heater.
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Heat Pump Operation• Each of these circuits is closed and sealed from the
others—there is no direct mixing.
• However, heat energy does transfer from the refrigeration circuit to the other three circuits.
• The refrigerant flow will change direction when the unit changes modes (heating or cooling).
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Heat Pump Operation• The Four Circuits in a Geothermal Heat Pump
Distribution Circuit
Earth Loop Circuit
Refrigeration Circuit
Hot Water Circuit
= Flow of Energy(Heat)
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Heating Mode Operation
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Cooling Mode Operation
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The Basic Refrigeration CycleCompressor
CondenserEvaporator
TXV
High PressureVapor State
High PressureLiquid State
Low PressureLiquid State
Low PressureVapor State
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The Refrigeration Cycle• Heating Mode Operation
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The Refrigeration Cycle• Cooling Mode Operation
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Free Energy• Geothermal Heat Pumps use only a small amount of
energy to capture a large amount of FREE energy from the earth.
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Equipment Performance Ratings• ARI has designated the efficiency ratings for water-to-air
heat pumps as:– Energy Efficiency Ratio (EER)
• EER = BTU output divided by power watt input• For cooling operation under steady state test
conditions
– Coefficient of Performance (COP)• COP = BTU output divided by BTU input• For heating operation under steady state test
conditions
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Geothermal Performance Comparison
0
5
10
15
20
25
30
Cooling Efficiency (EER)
New Geothermal Unit
Previous Geothermal Unit
High Efficiency AC or HeatPump
Ordinary Air Conditioner or HeatPump
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Geothermal Performance Comparison
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Heating Efficiency (COP)
New Geothermal Unit
Previous Geothermal Unit
Heat Pump
High Efficiency Gas/PropaneFurnace
Ordinary Gas/Propane Furnace
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Operating Cost Comparison
Annual Heating, Cooling & Hot Water costs for typical 2,500 sq. ft. home, local weather, local fuel rates (computer analysis results) Geothermal $ 780 High Efficiency Nat. Gas & A.C. $ 1,497 Air Source Heat Pump $ 1,608 High Efficiency Propane & A.C $ 2,305
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Return on Investment (Due to Energy Savings)
• New Homes: Typically positive cash flow from “day one”. – Added cost in mortgage is offset by
reduced monthly operating cost.
• Existing Homes: Additional cost of geothermal system is usually recovered in about 5 years.
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Loop Types• Closed Loop (w/ antifreeze)
– Horizontal– Vertical– Pond
• Open Loop– Well Water
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Positive & Negatives • Open well systems
+ can be cheaper initial install cost+ constant supply of consistent btuh’s- requires substantial water over life of system- if well fails no heating or cooling- not allowed in some local areas
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Well Water (Open Loop)
Uses existing well
Requires 1.5 gpm/ton
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Open Loop Systems
• Key Considerations– Adequate water supply (5-9 gpm in addition to
household requirements)– Good quality water (low mineral content)– Adequate discharge location (drainage ditch, field tile,
pond, etc.)
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Positive & Negatives • Closed loop systems
+ low maintenance+ typical one time install, long warranty on pipe- higher up front installation cost- variable supply of btuh’s so sizing is critical- requires dedicated space for wells or trenches
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Horizontal Loop
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10 ft.
3 feet
2 feet 5- 6 feet
2 feet
2- Pipe Horizontal
Typically 3-4 trenches, 250 feet long each
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10 ft.
3 feet
2 feet 5- 6 feet
2 feet
4- Pipe Horizontal
Typically 2 trenches, 180 feet long each
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10 ft.
3 feet
2 feet5- 6 feet
2-3 feet 1 foot
6- Pipe Horizontal
Typically 1 or 2 trenches, 120 feet long each
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Horizontal 4 & 6 Pipe Loops
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Typically 3 or 4 trenches, 100-150 feet long each
10 ft.
5- 6 feet
2-3 feet
Slinky
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Horizontal Slinky Loops
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Horizontal Bore Loops
Typically 3-4 bores, 200 feet long each
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Vertical Loop
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10 – 15 feet
5- 6 feet
Side View
120 – 150 feet
Vertical LoopTypically 3 to 5 bore holes, 130 feet deep each
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Vertical bore without backfill
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Vertical Loop/Grouted
Bentonite Grout backfill
Geothermal pipe
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U-Bend used for Vertical Loops
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Vertical Loop Drilling
Use drilling rig like ones used for water well drilling.
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Pond Loop
Minimum ½ acre, 8 ft. deep
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Spacers allow for more circulation around pipes
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Top View
Side View
Typically 3 to 5 coils, 300 feet long each
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Horizontal Pond/Lake LoopsSlim Jim Lake Plate Heat
Exchanger
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Racked Loops
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Position, Fill & Submerge
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Applications• Forced air heating and cooling• Supplemental water heating• Forced Air Zoned Systems• Dedicated water heating (radiant floor, snow
melt, domestic purposes, pools)• Add-on splits to fossil fuel furnaces
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Limitations
• Water-to-Air units:• Return Air temperatures• Adequate Ductwork• Water-to-Water units: Load-Side Flow• Load-Side Temperature
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Limitations
• All units:• Loop Considerations• Available Space• Installation Costs
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Typical Closed Loop Equipment and Accessories
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Typical Installation
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Water-to-Water Systems• Homes with large hot water
demands, radiant floor heat, snow melt and indoor pools can be ideal for water-water systems.
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RFH with a Fan Coil Cooling System
W 2 W Unit
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Cornerstone Christian AcademyBloomington, IL
51,000 Sq. Ft.
Annual Cost for Heating, AirConditioning, and Hot Water
Conventional System Geothermal System$32,618 $8,519
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Amber Ridge Assisted LivingMoline, IL
Conventional System Geothermal System
$15,199 / year $6,592. / year
First Assisted Living Facility in US to receive Energy Star rating
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Martin-Kroenke ImplementQuincy, IL
29,225 Sq. Ft.
Annual Cost for Heating, AirConditioning, and Hot Water
Conventional System Geothermal System$13,986 $3,581
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Lincoln Towers ApartmentsBloomington, IL
60,000 Sq. Ft.
Annual Cost for Heating, AirConditioning, and Hot Water
Conventional System Geothermal System$38,380 $12,737
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Trinity Lutheran ChurchGolden, IL
16,000 Sq. Ft.
Annual Cost for Heating, AirConditioning, and Hot Water
Conventional System Geothermal System$12,926 $3,984
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Marine Safety StationChicago, IL
Conventional System Geothermal System
$9,650. / yr $3,827. / yr
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Wheaton Christian Grammar SchoolWheaton, IL
86,320 Sq. Ft.
Annual Cost for Heating, AirConditioning, and Hot Water
Conventional System Geothermal System$67,020 $33,340
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Geothermal
• Dubuque Co. Courthouse
• Historics
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30% Tax Credit
• The Energy Credit• In October 2008, geothermal heat pumps were added to
section 25D of the Internal Revenue Code. This created• a 30% tax credit for costs associated with qualified
geothermal equipment.- 30% of total system cost- No limit to credit amount for 2009 and beyond- Can be used in more than one year- Can be combined with solar and wind tax credits- Can be combined with energy efficiency upgrade credits
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What’s Eligible
• Geothermal equipment that uses the stored solar energy from the ground for heating and cooling, and that meets Energy Star requirements at the time of installation is eligible for the tax credit.
• Covered expenditures include labor for onsite preparation, assembly, or original system installation and for piping or wiring to connect a system to the home.
• The structure must be located in the United States and used as a residence by the taxpayer, although primary residency isn’t required. In fact, if geothermal is installed in more than one home, there’s no limitation on the number of times the credit can be claimed
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Questions?
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Geothermal Heating & Cooling…
“Smarter from the Ground Up”