Geothermal / Geoexchange Systems


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Vice President Pete Jefferson delivers a presentation at USGBC Colorado's Sustainability Summit.

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Geothermal / Geoexchange Systems

  1. 1. Presented by Pete Jefferson M.E. Group, Inc.
  2. 2. Geothermal Basics Applications Advantages of Geothermal Process for Implementing Geothermal Palmer Ridge High School Case Study Brent’s Place Case Study
  3. 3. Also called “Geoexchange” or ground Geoexchange ground- source. Works for both heating and cooling g g purposes. Takes advantage of relatively stable ground temperatures (50-55 F). Works in any location. Ground ater temperature Gro nd water temperat re maintained between 25 F to 95 F. Moves “heat”, doesn’t move “cool”. heat doesn t cool
  4. 4. Summer Operation •Moves heat from room into refrigerant line. •Refrigerant line moves heat to ground loop water. •Ground loop water moves heat to earth earth. •Ground loop water returns to compressor cooler •Similar t normal A/C Si il to l process conceptually.
  5. 5. Winter Operation •Heat moves from earth into ground water loop •Water loop moves heat to refrigerant line •Refrigerant line moves heat to room •Ground water returns to Ground earth cooler
  6. 6. Horizontal Loop Vertical Loop
  7. 7. Typical schematic:
  8. 8. Other sources for geothermal: • Ponds • Rivers • Aquifers • Volcanic areas • Open loop
  9. 9. Building heating and cooling Hot water heating Process cooling Snowmelt systems
  10. 10. Geothermal can be used on any project type Historically, Historically these projects have used geothermal systems most often: • Schools • Government • Offices • Residences
  11. 11. Energy Efficiency • SEER ratings of up to 27 versus the average 13 SEER cooling unit • Can be 5 times more efficient in heating mode • Takes advantage of simultaneous heating and cooling, rather than wasting energy • Qualifies for rebates in many locations • Payback of 3-10 years without rebates f 3 10
  12. 12. Less maintenance Space savings This manifold system serves a 220-ton, 75,000 square foot facility. There are no boilers chillers or boilers, chillers, cooling tower.
  13. 13. Technology HVAC System Daylighting Building Envelope
  14. 14. 1. 1 Obtain geothermal conductivity test ($6-8 ($6 8 K, well is reusable) 2. 2 Determine type of well field (horizontal vs vs. vertical) 3. 3 Payback analysis 4. Ensure adequate ceiling space (3-4 feet if horizontal heat pumps) 5. Locate units for accessibility , noise control, control and temperature zoning zoning.
  15. 15. 217,000 square feet 217 000 Why did we go with geothermal? Soil profile 200 wells, 400 feet deep, 20 feet on center serves 440 tons of load Rebates/grants • $190 000 from Intermountain Electric / MVEA $190,000 Largest geothermal heat pump project in state of Colorado
  16. 16. Why did we go with geothermal? Soil issues 54 wells 300 feet deep 20 feet on center wells, deep, serves 50 tons of load Rebates/grants • $25K from Xcel Energy • Grants from Kresge Foundation
  17. 17. Geothermal Heat Pump Consortium • Department of Energy •