Graduate Thesis Or Dissertation
 

Geothermal well downhole heat exchanger design analysis

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/p2676x817

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  • The low temperature geothermal resource at Klamath Falls, Oregon is widely used for heating buildings. A common technique for using this resource consists of a heat exchanger down in the well inside a casing which extends the full length of the well. Slots are cut in the casing to allow circulation of the geothermal water into the casing and past the downhole heat exchanger. This results in thermosyphoning between the inside and outside of the casing. Mathematical models of thermosyphoning through the well casing were developed for both with and without downhole heat exchanger present. Results of the model without heat exchanger present showed that thermosyphoning is sufficient to account for observed flow rates through the casing. Model results with heat exchanger included show the substantial influence of thermosyphoning on heat transfer rates and indicate several promising approaches to maximizing output. Because of the importance of scaling and corrosion on the success of a downhole heat exchanger installation, a study of available literature on scaling and corrosion relevant to downhole heat exchangers in low temperature geothermal systems was made and recommendations for corrosion control were developed. Scaling was not deemed severe enough to justify available control measures.
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