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Team GeoMELT

Team GeoMELT. 05.08.2010. The Team. Outline. Project Overview Major Design Decisions Design Snowmelt Geothermal Site Development Model Conclusions Questions. Project Overview. Problems with the Burton St. Entrance to Calvin Why not use Geothermal energy? . Overview - Goals.

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Team GeoMELT

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  1. Team GeoMELT 05.08.2010

  2. The Team

  3. Outline • Project Overview • Major Design Decisions • Design • Snowmelt • Geothermal • Site Development • Model • Conclusions • Questions

  4. Project Overview • Problems with the Burton St. Entrance to Calvin • Why not use Geothermal energy?

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

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

  7. Major Design Decisions • Snowmelt • What surfaces to melt • Is a heat pump required? • Geothermal • Horizontal vs. Vertical • Site Design • Pumphouse location • Piping and manifold layout • Model • Component selection

  8. Snowmelt Design - Overview • 4,000 ft2 to melt at 150 BTU/hr- ft2 • 60 tons – About 20 times that of a house • Manifolds are used to distribute heat to the snowmelt area

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

  10. To Snowmelt Loops Condenser Q Compressor Evaporator Q From Geothermal Loops

  11. Snowmelt Design – Heat Pump • Entering temperature of 105 °F • Exiting temperature of 90 °F

  12. Geothermal Design • First Major Step in the Geothermal Design: • Pipe layout: Horizontal or Vertical • Advantage/Disadvantage Analysis • Design Choice: Vertical Loop • Cooling ground over time?

  13. Geothermal Design • Calculated the total bore length required: 9375 ft • Limit Bore Depth to 390 ft • Pipe diameter – 1 ¼” http://img.directindustry.com/images_di/photo-g/well-drilling-rig-354735.jpg

  14. Geothermal Design • 24 Well Locations • Adequate spacing • 2” HDPE pipe to pump house • 3 rectangular manifolds • Design avoids tree removal! • Pumphouse hidden from view

  15. Site Design - Pumphouse Plan View Isometric View

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

  17. Model Control System

  18. Conclusions - Cost Analysis • Payback Period: 55 years • Our recommendation: Don’t do it!

  19. Conclusions • Why is this not economically feasible? • We had three false assumptions: • Snow can be melted with ground temperature water • The entrance being isolated is a problem for traditional snowmelt systems • The ground can be an unending heat source

  20. Acknowledgements • Trent DeBoer, GMB Engineering • Steve Schultz, GMB Engineering • Scott Post, Prein&Newhof • Charles Huizinga, Calvin College Physical Plant • Marc Huizinga, Calvin College Physical Plant • Professor Nielsen, Team Advisor • RenTubergen, Gumbo Product Development, Inc. • Gary Slykhouse, City of GR Engineering Dept. • Bob Bruggink, Moore & Bruggink, Inc.

  21. Questions

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