Geothermal heat pump systems use the earth as a heat source and heat sink. They work by transferring heat from the building to the ground in the summer and from the ground to the building in the winter. This allows geothermal systems to lower energy costs by 30-60% and reduce greenhouse gas emissions by 40-70% compared to traditional HVAC systems. Geothermal systems have higher upfront installation costs but paybacks of 5-12 years due to long term energy savings and tax credits.

1. Geothermal Heat Pump Systems Being Green by using the Ground Presented by : Warren (Trey) Austin, PE, CEM, CGD, LEED-AP Geo-Energy Services, LLC

2. Geothermal 101 Terminology Geothermal/Ground Source Heat Pump / GeoExchange General term that groups all aspects of the technology and industry together COP - Coefficient of Performance; Rating for Heating Mode- DHW Heating Only for our case EER - Energy Efficiency Ratio; Rating for Cooling Mode

3. Geothermal 101 Terminology Continued Borehole HDPE Grout Ground Thermal Conductivity

4. Vertical Loop Installation Equipment Flushing Fusion Equipment Grout Pipe Drill Rig Vertical Ground Loop

5. Ground Loop Temperature Profile T fluid = 9600’ T ideal = 32,960’

6. The earth is like a solar battery absorbing nearly half of the sun’s energy. The ground stays a relatively constant temperature through the seasons. 45% absorbed by ground Space Atmosphere Earth U.S. Dept. of Energy Passive geothermal gradient

7. It’s a Heat Source in Winter… 0  F  in winter 70  F A Geothermal System cools the ground in winter & transfers the heat into the building… 40-60  F Insulating layer of earth 2. How Does It Work? It’s a Heat Source in Winter 0°F in Winter Sinusoidal temperature layer of earth Heats the building in winter by absorbing heat from the ground 40 °F -60°F Ground Temperature 70°F Space Temperature

8. It’s A Cool Place to Dump Heat in Summer 95  F in summer 70  F 40-60  F … and cool the building in summer by rejecting heat to the ground Insulating layer of earth 2. How Does It Work? 98°F in Summer Cools the building in summer by rejecting heat to the ground It’s a Source to Reject Heat in Summer 40°F-60°F Ground Temperature 70°F Space Temperature Sinusoidal temperature layer of earth

9. Geothermal Heat Pump – Heating Mode

10. Geothermal Heat Pump – Cooling Mode

11. 30%-60% Lower Operating / Energy Cost 40%-70% reduction in Green House Emissions 100% Site Reduction Longer life span Greater Comfort Less Maintenance, Simplified Controls Better Aesthetics (no exposed outdoor equipment) LEED/Green Building solutions Benefits of GSHP System

12. Cost and Paybacks Installation cost ranges $18.00 to $22.00 / ft 2 Operating costs $0.45 to $0.85 /ft 2 -yr Paybacks can be immediate to 5 years Average: 5-8 years Some systems can be 8-12 years Rebates/Tax Credits Depend on local utilities Federal Tax Credits

13. Heat Rejection/Absorption Synergies Space Cooling Refrigeration Rejection Hot Water Heating Load Shallow Heat Rejection Slab Greywater Reclaim Fluid Cooler Rainwater Reclaim Ground Loop Heat Exchanger Space Heating

14. Internal Component of GeoExchange Systems Air Units Horizontal HP Vertical Console Rooftop Vertical Stack Split Hydronic Units WW

15. Vertical Loop Field

16. Vault

17. Horizontal Slinky (Pit) Loop

18. Special Application

19. Commercial Heat Pump Installation

20. Pond/Lake Loop

21. Pond/Lake Loop

22. Pond Loop- Plate Heat Exchanger

23. Geo-Energy Services www.geoenergyservices.com Rocky Mountain Geothermal www.rockymountaingeothermal.com International Ground Source Heat Pump Association www.igshpa.okstate.org Geothermal Heat Pump Consortium www.geoexchange.org Internet and Literature Resources

27. Questions?