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A novel coaxial BHE: Description and first Distributed Thermal Response Test Measurements
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-3490-1777
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2010 (English)In: Proceedings World Geothermal Congress 2010, 2010, paper 2953- p.Conference paper, Published paper (Refereed)
Abstract [en]

The thermal performance of a Borehole Heat Exchanger plays a significant role when defining the quality of heat exchange with the ground in Ground Source Heat Pumps. Different designs have been discussed and increased interest on innovation within this field has taken place during the last years. This paper presents the first measurement results from a 189 meters deep novel coaxial Borehole Heat Exchanger, consisting of an inner central pipe and an annular channel in direct contact with the surrounding bedrock. The measurements were taken during a distributed thermal response test using fiber optic cables installed in the energy well. Fluid temperature every ten meters along the borehole depth are presented and compared with similar measurements from a common U-pipe heat exchanger. A unique measurement of the borehole wall temperature in the coaxial collector illustrates how effective the heat transfer performance is through the annular channel.

Place, publisher, year, edition, pages
2010. paper 2953- p.
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-73143OAI: oai:DiVA.org:kth-73143DiVA: diva2:488583
Conference
IGA World Geothermal Congress 2010. Bali. 25th - 30th April 2010
Note
QC 20120425Available from: 2012-02-01 Created: 2012-02-01 Last updated: 2012-04-25Bibliographically approved

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Acuña, JoséPalm, Björn

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