Geothermal 101 and Heat Recovery for Breweries · HLT Boiler therms 13,140 $11,826 Glycol Chiller...
Transcript of Geothermal 101 and Heat Recovery for Breweries · HLT Boiler therms 13,140 $11,826 Glycol Chiller...
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Geothermal 101 and Heat Recovery for Breweries
Rob Olden, CEM Element Energy Consulting
312-620-0092 [email protected] www.element-co.com
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ElementEnergyBio
• Involvedinover65geothermalprojectsoverthepast13years– WalgreensNetZero– WintrustHQretrofit– FrankLloydWright’sUnityTemple
• Expertiseingeothermalheatrecovery• Expertiseincraftbreweries/distilleries
• Eris • Metropolitan • Alarmist • Rite Bee
• Middlebrow • Ike and Oak • Wild Onion • Englewood
• Banging Gavel • Obscurity • 28 Mile
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Summary
• GeothermalBasics• TaxCredits• BreweryDesign• ErisBrewery(ASHRAETechAwardWinner)• RealWorlddatacomparedtoprojected
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EarthisaVastSolarCollector
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U.S.UndergroundTemperatures
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72°F
62°F Geothermalheatpumpstransferundergroundheatintothebuildingtoprovideheating
The Earth is a Source of Heat in Winter…
Outdoor air temperature: 5°F
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Outdoor air temperature: 100°F
72°F
62°F
Geothermalheatpumpstransferheatfromthebuildingtotheearthtoprovidecooling
… and an Efficient Place to Reject Heat in the Summer…
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Geothermalheatpumpscirculatewaterthroughasealedundergroundpipingloopwhereitisnaturallywarmed(orcooled)bytheearth
…using Heat Pump Technology
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Geothermal is not new technology
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Geothermal is not new technology
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FreeEnergy
• GeothermalHeatPumpsuseonlyasmallamountofenergytocapturealargeamountofFREEenergyfromtheearth.
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Residential Site Energy Conventional System
Over 70% of the energy consumed by a typical home is used for heating, cooling, and water heating
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Residential Site Energy Geothermal Heat Pump System
Total site energy consumption is cut in half
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GeothermalPerformanceComparison
0
5
10
15
20
25
30
Cooling Efficiency (EER)
New Geothermal Unit
Previous Geothermal Unit
High Efficiency AC or HeatPump
Ordinary Air Conditioner orHeat Pump
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GeothermalPerformanceComparison
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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Loop Types • Closed Loop
– Horizontal – Vertical – Pond
• Open Loop – Well Water
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Well Water (Open Loop) Uses existing well
Requires 1.5 gpm/ton
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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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Horizontal4&6PipeLoops
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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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HorizontalSlinkyLoops
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HorizontalBoreLoops
Typically 3-4 bores, 200 feet long each
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Directional Bore System
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Vertical Loop
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10 – 15 feet
5- 6 feet
Side View
120 – 150 feet
Vertical Loop
Typically 3 to 5 bore holes, 400 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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CraftBrewery
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TheBaseline
Systems
Units
Baseline
$31,924
RTU CLG kWh 33,645 $3,701 RTU HTG therms 4,559 $4,103 RTU Fan kWh 9,071 $998 CLG Cap Tons 41 HTG Cap Mbh 767 HLT Boiler therms 13,140 $11,826 Glycol Chiller kWh 102,696 $11,297
Allenergycostsarebasedonflat$/kWhof$.11and$/thermof$.90
Systems
Baseline
RTUs $42,500 ERVs $0 Interior Scope $170,050 Geothermal Field Scope $0 Fluid Cooler $0 Glycol Chiller $20,000
Total $232,550
• 2x20tonpackageRTU’s• G&D7x7HGlycolChiller• 30BBLHotLiquorTank• 960MBHSteamBoiler• 398MBHDHW
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TheProposed
• RTU’sremain,fullyredundant• Steamboilerremains,fullyredundant• FermenterandHLTareun-changed• Hybridgeosystemis20Ton’s• 8Boreholeat500’deep
controls
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ErisGeothermalPlan
8BHEs
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SummaryofResults Systems
Baseline
Geothermal + Process
+ DCV
Δ from Baseline
RTUs $42,500 $42,500 $0 ERVs $0 $0 $0 Interior Scope $170,050 $290,050 $100,000 Geothermal Field Scope $0 $93,000 $93,000 Fluid Cooler $0 $0 $0 Glycol Chiller $20,000 $0
Total $232,550 $425,550 $193,000
Systems
Units
Baseline
$31,924 Hybrid Geo + Process
$22,453 RTU CLG kWh 33,645 $3,701 29,375 $3,231 RTU HTG therms 4,559 $4,103 1,222 $1,100 RTU Fan kWh 9,071 $998 7,890 $868 Pump Energy kWh 767 3,224 $355 HLT Boiler therms 13,140 $11,826 5,302 $4,772 Glycol Chiller kWh 102,696 $11,297 110,255 $12,128
• $9,471AnnualSavings[30%]
• 49%oftotalenergysavings
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EconomicResults
CAPITAL COSTS
Baseline System
Geothermal + Process
+ DCV
Baseline HVAC ($16.35/PSF) $212,550 $212,550 Interior HVAC increment $120,000 Geothermal Field Contract $93,000 Glycol Chiller $20,000 Total initial cost outlay $227,550 $425,550 Incremental cost $193,000
Geothermal Energy Property Value $383,050
INCENTIVES Geothermal Tax Credit (ITC) ($38,305) NPV Straight Line depreciation (39 years) ($28,332)
NPV MACRS depreciation (5 years) ($118,096)
NPV after tax incentives $204,218 $269,191 Year one energy savings $9,471 Pay back after incentives and energy escalation
4.1
Internal rate of return 17.30% NPV of 25-year savings $99,277 Cumulative 25-year savings $389,873
• Processintegrationaloneisa9.4yearpaybackon$59,500upfrontcost
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5-yearGeo-Temps11010510095908580757065605550454035302520151050
1 8761 17521 26281 35041 43801
FluidTemps
Hours
GeothermalFluidTempsOver5Years
L W T _ H P ° FE W T _ H P ° FLWT_GHX°F
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ProcessIntegration
-1000
-800
-600
-400
-200
0
200
400
600
800
-1000
-800
-600
-400
-200
0
200
400
600
800
477647774778477947804781478247834784478547864787478847894790479147924793479447954796479747984799
Houroftheyear
SystemPowerProfile:DesignCoolingDay(July18)
CLGLoadsProcessHTGLoadsContinuedGasBoileruse
GeoProcessCLGLoadsProcessCLGLoadsCLGHeatRecoveryTankTemp
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TheFinalDesign
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MeasuredData
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GeoHeatRecovery
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MeasuredSavings
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Conclusions
• Sofarthesystemhasachieved$4,767ofthe$7,054projectedgasenergysavings.– Thisisrightontrackwithbasedon8monthsworthofdata.
• Heatrecoverysystemsdonothavetocostafortune– Experiencehydronicsandgeothermalcontractors
• Controlscanbesimplified• Taxcreditscanstillmakegeothermalfinanciallyfeasible