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Geothermal Heat PumpsGeothermal 101Understanding the MysteryECONAR Energy Systems1

Geothermal Topics• Geothermal Concepts• System Components• Moving Heat with Geothermal• Residential Case StudyECONAR Energy Systems2

The Basic ConceptGeothermal Moves HeatNaturallyECONAR Energy Systems3

Geothermal ConceptsHeat moves:From WarmTo CoolECONAR Energy Systems4

Geothermal Concepts•Geothermal uses the Earth’snatural heat as a renewablereliable energy source•It uses refrigeration technology•There is one system for heatingand coolingECONAR Energy Systems5

Geothermal Concepts• Earth’s surface temperature @ 8 feetremains constant at about 50°• Geothermal moves heat naturally• Fossil fuel systems create heatECONAR Energy Systems6

Your Solar CollectorECONAR Energy Systems7

Geothermal ConceptsPurpose of the Heat Pump:• To provide a temperature difference• The temperature difference moves Btu’sECONAR Energy Systems8

Geothermal ConceptWinter - Heating:Geothermal moves heat out of the EarthSummer - CoolingGeothermal moves heat into the EarthECONAR Energy Systems9

Three Basic Components• 1) The Earth• 2) Geothermal Heat Pump• 3) HVAC Distribution SystemsECONAR Energy Systems10

Moving Heat - The Geothermal ConceptKey ComponentsGeothermal Heat PumpAir Distribution SystemGeothermal Loop FieldWarm AirIntensifyHeatRemovingHeat fromthe EarthECONAR Energy SystemsRefrigerant to AirHeat ExchangerWater to RefrigerantHeat Exchanger11

The EarthThe 1 st ComponentECONAR Energy Systems12

Your Solar CollectorECONAR Energy Systems13

The Earth• Excellent solar collector• Natural renewal heat source• Easy to use as heat exchangerECONAR Energy Systems14

Earth Heat ExchangersTwo types:• Earth Loop / Pond Loop (closed)• Open Loop (well water)ECONAR Energy Systems15

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Earth Heat Exchanger:Horizontal Closed Loop FieldTypical 6-Ton Horizontal SystemECONAR Energy Systems19

Vertical Closed LoopECONAR Energy Systems20

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Types of Heat Pumps• Forced Air Heating & Cooling• Hydronic• Combination Forced Air &HydronicECONAR Energy Systems22

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Inside the Heat Pump• Compressor• Refrigerant• Water Coil• Expansion Valve• Air Coil• Electronic Sensors & ControlsECONAR Energy Systems24

Moving Heat Naturally50° Groundwarms 32° Waterwarms 25° RefrigerantCompressorRefrigerant enters @ 25°Refrigerant leaves @ 160°160° Refrigerantwarms 70° Return Airto 100° Supply AirECONAR Energy Systems25

Moving Heat - The Geothermal ConceptKey ComponentsGeothermal Heat PumpAir Distribution SystemGeothermal Loop FieldWarm AirIntensifyHeatRemovingHeat fromthe EarthECONAR Energy SystemsRefrigerant to AirHeat ExchangerWater to RefrigerantHeat Exchanger26

A Review:The 3 Geothermal Components• Earth Heat Exchanger• Geothermal Heat Pump• HVAC Distribution SystemECONAR Energy Systems27

Geothermal Advantages• Economical:• Renewable50 % savings vs. Natural Gas75 % savings vs. PropaneEarth’s Surface – Solar Heated• Comfortable: Not a Drying Heat & Better A/C• Single Unit:Heat & Cooling• No Fossil Fuel: No Combustion, Safe• Low Maint.ECONAR Energy SystemsLocated Inside, uses Ref. System28

Geo 101 Summary• Moving the Earth’s renewable heat• Heat will always move from Warm to Cool• Geothermal Heat Pumps:- create the needed temperature difference tomove Btu’s• Single system for heating & coolingECONAR Energy Systems29

Your Solar CollectorECONAR Energy Systems30

Case Study - Residential• Typical Minnesota Home• 3,000 SF• Annual Heating @ 100 MBTUECONAR Energy Systems31

Residential Heating CostsType of System CostGeothermal $ 651 ( using $.080 per Kwh)85% Nat. Gas $ 1,588 (using $1.35 / therm)85% Propane $ 3,343 (using $ 2.60 / gal.)Electric $ 2,345 ( using $ .080 per Kwh)Annual Heating Usage @ 100 MbtuECONAR Energy Systems32

Case Study – Residential Clg.Annual Cooling Cost:Traditional A/C $ 200Geothermal Cooling $ 140Geo Savings $ 60ECONAR Energy Systems33

Case Study – ResidentialAnnual Savings SummaryAnnual Geothermal SavingsCompared to: Htg + Clg = TotalNatural Gas $ 937 + $ 60 = $ 997Propane $ 2,694 + $ 60 =$ 2,754Electric $ 1,694 + $ 60 = $ 1,754ECONAR Energy Systems34

Your Solar CollectorECONAR Energy Systems35