Evaluation of a coaxial borehole heat exchanger prototype
2010 (English)In: Proceedings of the 14th ASME International Heat Transfer Conference, ASME Press, 2010Conference paper (Refereed)
Different borehole heat exchanger designs have been discussed for many years. However, the U-pipe design has dominated the market, and the introduction of new designs has been practically lacking. The interest for innovation within this field is rapidly increasing and other designs are being introduced on the market. This paper presents a general state of the art summary of the borehole heat exchanger research in the last years. A first study of a prototype coaxial borehole heat exchanger consisting of one central pipe and five external channels is also presented. The particular geometry of the heat exchanger is analyzed thermally in 2-D with a FEM software. An experimental evaluation consisting of two in situ thermal response tests and measurements of the pressure drop at different flow rates is also presented. The latter tests are carried out at two different flow directions with an extra temperature measurement point at the borehole bottom that shows the different heat flow distribution along the heat exchanger for the two flow cases. The borehole thermal resistance of the coaxial design is calculated both based on experimental data and theoretically.
Place, publisher, year, edition, pages
ASME Press, 2010.
Coaxial Borehole Heat Exchanger
IdentifiersURN: urn:nbn:se:kth:diva-73125DOI: 10.1115/IHTC14-22374ISI: 000307206500042ScopusID: 2-s2.0-84860503838ISBN: 978-0-7918-2879-2OAI: oai:DiVA.org:kth-73125DiVA: diva2:488564
14th ASME International Heat Transfer Conference. Washington, DC, USA. August 8–13, 2010
QC 201204252012-02-012012-02-012013-06-11Bibliographically approved