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Feasibility Study of Feasibility Study of Geothermal Geothermal
Heating SystemsHeating Systemsat Ithaca Collegeat Ithaca College
Sanya LeviSanya LeviProf. Beth Ellen ClarkProf. Beth Ellen Clark
April 6, 2005 Whalen April 6, 2005 Whalen SymposiumSymposium
The Adam Joseph Lewis Center for The Adam Joseph Lewis Center for Environmental StudiesEnvironmental Studies
Example of a campus building that uses geothermal heat pumps
Requirements for LEED certificationRequirements for LEED certification Minimum Energy Performance Minimum Energy Performance CFC Reduction in HVAC EquipmentCFC Reduction in HVAC Equipment
Geothermal Heat Pumps
Energy Efficient Environmentally Friendly
Greenhouse reduction is equal to planting 1 acre of trees or taking 2 cars off the road
Geothermal SystemsGeothermal Systems
RefrigeratorRefrigerator
Geothermal Heat Geothermal Heat PumpPump
Comparison between conventional Comparison between conventional system and geothermal heat pump system and geothermal heat pump
Q=mcQ=mcΔΔTT
average winter day average winter day 22F or 268K 22F or 268K average room temperature average room temperature 74F or 298K 74F or 298K energy required energy required Q1=mc(30K)Q1=mc(30K)
average annual temperatureaverage annual temperature 60F or 291K 60F or 291K average desired room average desired room 74F or 298K74F or 298Kenergy required energy required Q2=mc(7K)Q2=mc(7K)
Q1/Q2 = mc(30K)/mc(7K) = 4Q1/Q2 = mc(30K)/mc(7K) = 4
Geothermal is 4 times more efficientGeothermal is 4 times more efficient
Why geothermalWhy geothermal
Stable Heat Source - Energy EfficientStable Heat Source - Energy Efficient Indoor unitIndoor unit
• Reduced noiseReduced noise• Low maintenanceLow maintenance• No vandalism or weatheringNo vandalism or weathering
No back up heat source requiredNo back up heat source required• Greatly reduces the greenhouse gas emissionsGreatly reduces the greenhouse gas emissions• Does not burn fuelDoes not burn fuel
How much can we save by using How much can we save by using geothermal heat pumps at IC?geothermal heat pumps at IC?
AssumptionsAssumptions Fuel prices increase at about 2%Fuel prices increase at about 2% Payback time 25 yearsPayback time 25 years
FactorsFactors Current use of natural gas and electricityCurrent use of natural gas and electricity Installation costInstallation cost Incentives from the stateIncentives from the state Electricity use is lower with heat pumpsElectricity use is lower with heat pumps Fuel is unnecessary with heat pumpsFuel is unnecessary with heat pumps
Center of Natural SciencesCenter of Natural SciencesYearly Operating and Maintenance Cost Yearly Cumulative Savings
Gannet CenterGannet CenterYearly Operating and Maintenance Cost Cumulative Yearly Savings
Muller HallMuller HallYearly Operating and Maintenance Cost Cumulative Yearly Savings
ConclusionConclusion
Our study indicates that GHPs are Our study indicates that GHPs are economically feasibleeconomically feasible
Savings Savings $25,000-112,000 per building per year$25,000-112,000 per building per year 85 million ft85 million ft33 fuel per year (CNS) fuel per year (CNS) 10,200,000 lbs of CO10,200,000 lbs of CO22 per building per year per building per year
(CNS)(CNS) GHPs are an important option that IC needs GHPs are an important option that IC needs
to consider to make existing buildings more to consider to make existing buildings more sustainablesustainable