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Team GeoMELT

Team GeoMELT. 05.08.2010. The Team. Outline. Project Introduction Goals Site Assessment Design Norms Final Design Snowmelt Geothermal Pumphouse Model Project Cost Conclusions Acknowledgements Questions. Project Introduction. Michigan receives ≈ 72 inches of snow annually .

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Team GeoMELT

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  1. Team GeoMELT 05.08.2010

  2. The Team

  3. Outline • Project Introduction • Goals • Site Assessment • Design Norms • Final Design • Snowmelt • Geothermal • Pumphouse • Model • Project Cost • Conclusions • Acknowledgements • Questions

  4. Project Introduction Michigan receives ≈ 72 inches of snow annually Lake-effect snow can lead to severe storms, but Calvin never cancels class! http://www.duluthstreams.org/understanding/lake_effect.html

  5. Project Introduction • Problems with the Burton St. Entrance to Calvin • Why not use Geothermal energy to melt snow? http://www.bing.com/maps

  6. Introduction - Goals • Primary Goal: Design a geothermal snowmelt system at Calvin’s Burton Street Entrance • Secondary Goal: Design a small scale model

  7. Introduction - Design Norms • Stewardship • Save on energy and reduce fossil fuel use • Caring • Increase safety for pedestrians and vehicles • Transparency • Honest recommendation

  8. Introduction – Site Analysis http://www.bing.com/maps • Assess the existing site • Where to place the geothermal field? • How much pavement should we melt? • What obstacles do we have to work around? • Large trees? • Pipes? • Fiber Optic Lines?

  9. Introduction – Site Analysis • Existing Infrastructure • Pavement/Curb lines • Watermain • Gas main • Storm Sewer • Fiber Optic Line

  10. Snowmelt 101 How it works Results you get! • Pipes buried in concrete • Slip free surfaces • No need to shovel/plow

  11. Snowmelt 101 • Using the software program EES for Thermodynamics

  12. Snowmelt 101 • Temperature drives heat transfer! • 55 °F water • Ice formation

  13. Snowmelt Design • 4,000 ft2 to melt at 150 BTU/hr- ft2 • 60 tons ≈ 20 times the heat load of a house • 2 Manifolds are used to distribute heat to the snowmelt area http://www.bing.com/maps

  14. Snowmelt Design – Pipe Layout • 1” PEX pipe • 500’ length loops • 9” on center pipe spacing • 3” from concrete surface

  15. Geothermal Energy 101 • Ground temperature over a year at varying depths Kavanaugh, Stephen P., and Kevin Rafferty. Ground-Source Heat Pumps. Atlanta: ASHRAE, 1997. 125-26. Print.

  16. Geothermal Energy 101 • Pump fluid through buried pipes to extract energy http://focusedthinking.files.wordpress.com/2009/04/geothermal_heat_pump.jpg

  17. Geothermal Energy 101 Heat In Heat Out • Residual Temperature Effects • Balanced systems

  18. Geothermal Design • Horizontal vs. Vertical

  19. Geothermal Design • Calculated the total bore length required: 9375 ft • Which is approximately 1.75 miles • Limit each bore depth to 390 ft • Pipe diameter – 1 ¼” http://img.directindustry.com/images_di/photo-g/well-drilling-rig-354735.jpg

  20. Geothermal Design • 24 Well Locations • Adequate well spacing • 3 rectangular manifolds • Design avoids tree removal! • Pumphouse hidden from view

  21. Heat Pumps 101 To Snowmelt Loops Condenser Q Valve Compressor Evaporator Q From Geothermal Loops

  22. Heat Pumps • Entering temperature of 105 °F • Exiting temperature of 90 °F

  23. Pump House Design Plan View Isometric View

  24. Model Design • Concrete with installed piping and moisture sensor • Insulation • Sand Sub-base • Soil with installed vertical geothermal loop

  25. Model Control System

  26. Project Cost • Geothermal Snowmelt System Cost Breakdown

  27. Project Cost Comparison • Payback Period: 55 years

  28. Conclusions • Payback Period: 55 years • Our recommendation: Don’t do it!

  29. Conclusions • What else did we learn? • Teamwork on a multidisciplinary project • Defining project goals early on is important • Have Fun!

  30. Acknowledgements • Trent DeBoer, GMB Engineering • Steve Schultz, GMB Engineering • Charles Huizinga, Calvin College Physical Plant • Marc Huizinga, Calvin College Physical Plant • Professor Nielsen, Team Advisor • RenTubergen, Gumbo Product Development, Inc. • Bob Bruggink, Moore & Bruggink, Inc.

  31. Questions… Please ask !

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