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Field Performance Assessment of Downhole Heat Exchangers in Puna District, Hawaii

Presentation Outline. . Introduction, Motivation, ObjectivesBackgroundPrevious experiences with PEX DHE installationsMethodologyField workTest data analysisResultsPossible DHE use in Puna District, HIConcluding summary. Introduction: What are DHEs?. . Closed-loop immersed in water wellsKnow

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Field Performance Assessment of Downhole Heat Exchangers in Puna District, Hawaii

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    2. Presentation Outline Introduction, Motivation, Objectives Background Previous experiences with PEX DHE installations Methodology Field work Test data analysis Results Possible DHE use in Puna District, HI Concluding summary

    3. Introduction: What are DHEs? Closed-loop immersed in water wells Known installations in U.S., Turkey, and New Zealand Less common/experimental installations in Iceland, Hungary, Russia, Italy, Greece, Japan In U.S., most concentrated uses are in Klamath Falls, OR and Reno, NV Over 500 DHE installations exist in Klamath Falls, OR

    4. Some existing applications include: Space heating of homes Space heating of schools Snow melting Introduction: What are DHEs?

    5. Project Motivation & Objectives Motivation: Okahara & Associates, Inc. (2007) conducted a feasibility study of direct uses of geothermal energy in the Kapoho/Pohoiki area of Puna on the Island of Hawaii Okahara & Associates, Inc. (2007) mentioned use of DHEs in Puna District, but actual performance and heat output of a DHE in Puna was unknown without a specific field test Objectives: Perform a “thermal response test” on an actual well in Puna to estimate long-term performance of a DHE Field-demonstrate practicality of a PEX DHE installation on a remote well

    6. Project Background: DHE Materials

    7. Methodology: Area of Study

    8. Methodology: Field Work Summary

    9. Methodology: Thermal Response Test

    10. Methodology: Thermal Response Test

    11. Results: Thermal Response Test

    12. Results: How Much Heat from the DHE?

    13. Concluding Summary PEX DHEs proved easy to install (and remove) at remote locations No heavy equipment needed No glue or solder required The well tested would not be a good candidate well for a DHE due to a thin water column and relatively low groundwater temperature However, thermal response testing did show good thermal transport properties for DHEs A well closer to the KERZ would presumably be hotter and more suitable for a DHE

    14. Acknowledgements This work was funded by the GeoPowering the West Program through the GeoHeat Center, OIT under Midwest Research Institute, National Renewable Energy Laboratory (NREL) Task Order No. KLDJ-5-55052-06. The authors also acknowledge the efforts of Scott Kieffer (Oregon Institute of Technology) who performed most of the field work.

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