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Geothermal Alliance of Illinois

Geothermal Alliance of Illinois. Getting it Right the First Time. Things I have heard . I don’t know anything about drilling I don’t know were to find a qualified Driller How do I know the driller did it right It takes up too much room It makes a mess of a nice yard.

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Geothermal Alliance of Illinois

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  1. Geothermal Alliance of Illinois Getting it Right the First Time

  2. Things I have heard • I don’t know anything about drilling • I don’t know were to find a qualified Driller • How do I know the driller did it right • It takes up too much room • It makes a mess of a nice yard

  3. The Basic Ground Source Heat Pump System The earth loop is placed in the ground either horizontally or vertically, or it can be placed in a pond. Water and anti-freeze is circulated through the pipe, transporting heat to the heat pump during the heating mode and away from the heat pump during the cooling mode. The heat transfer takes place inside the heat pump in a water-to-refrigerant heat exchanger.

  4. Closed loop systems (Revision:9/15/09)

  5. Ground Loop Options: • Closed Loop Systems (Re-circulated) • Vertical loop configurations • Horizontal loop configurations • Race Track • Slinky • Directional Bore • Pond loop configurations • Open loop – not re-circulated or closed

  6. Ground Heat Exchanger Configurations • Horizontal, Vertical or Pond? • If designed and installed properly, no one system is superior to another. • Criteria involved in decision • Available land and/or body of water • Soil conditions • Excavation & Drilling costs • Local regulations • Fusion & Flushing equipment

  7. Loop System Materials • Ground loop piping (250+ year life) • Plastic pipe – high density polyethylene (HDPE) which is a higher grade than natural gas pipelines • Heat fusion method of joining pipe & fittings – very reliable method which makes one continuous pipe (DR11) • Antifreeze heat transfer solution-Food grade • 50 year Manufacturer warranty on pipe

  8. Vertical Loop Systems

  9. Bullet Style U-bend

  10. Drill and Install Loop

  11. Vertical loop rules of thumb • Minimum of 12-15 foot between bores • Hole depths vary between 300’ and 500’ deep • Typical size is 6” or smaller • Grouted with Bentonite to prevent aquifer contamination and aid in heat transfer • Typically 200 to 400 pounds of sand is added to each bag of bentonite

  12. Grout loop

  13. Why Grout? • It protects the groundwater • It adds in the transfer of heat • It required by code • Grout ranges between .45 – 1.1btu/hr/ft • Permeability of 10 x -7 cm/hr

  14. Horizontal Loop Systems

  15. Typical Horizontal Loop Configurations

  16. Slinky Loop System

  17. Typical earth slinky dimensions(600’ coil)

  18. Directional Bore System

  19. Pond Loop Systems

  20. Typical Pond Loop Configurations

  21. The Present and Future • Geothermal regulation is currently a mess • New regulations are in process • The bill is passed JCAR • Not sure what forms will look like • Can’t regulate pipe or grout • Start Date?????????????

  22. Illinois State Water Well Drilling Code • Defines “Closed Loop Well” • “a sealed, watertight loop of pipe buried outside a building foundation which is intended to reticulate a liquid solution through a heat exchange.” • This is the only definition of a loop in the code • Loops must be grouted from bottom up

  23. Water Well Drilling Code • States that in Section 920.180 • A) Shall be grouted from the bottom up • B) No closer than 200’ from water well • C) If same owner 75’ • D) Liquid must be under pressure • Must be methanol, ethanol, propylene, • Calcium chloride or ethylene glycol • Maximum of 20% solution

  24. States Water Well Code • Defines grout as: • Bentonite Grout: “…mixture of sodium bentonite and water….minimum of 20% solids and water.” • Neat Cement Grout: “…94 pounds of cement to not more than six gallons water. Additives … may be added up to 6% to control shrinkage • Geothermal grout with sand is not addressed

  25. DuPage County • Requires • Permits and a licensed driller • Only allows propylene glycol “food grade” • Submittals on all materials • Fees • Grout inspections • Follows code to the letter

  26. Cook County • Requires • Nothing at this time

  27. Lake County • Requires • Permits by a licensed driller or IGSHP installer • Fees • Site plans • Follows the state for anti-freeze • Does grout inspection on occasion

  28. Winnebago • Requires: • Registration fee • Licensed driller • Construction reports • Does inspect grouting • Submits paperwork to the E.P.A. and considers all geo loops Class 5 injection wells

  29. Will County • A quote for one of the inspectors, “Just do a good job…”

  30. The future • Once the new code takes effect: • All projects except open trench will require permits • Must be done by licensed Companies • Permit drawings showing loops and lateral distances • Anti-freeze type on permit • Fees: $100 for first 10 then $10 each

  31. How to pick driller • Ask for references and licenses • Ask for Certifications, IGSHPA, GAOI • Tell the driller what you want • Require they provide insurance cert • Require that the flush, purge, and test field • Look at the loops • Get a DETAILED contract

  32. Questions?

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