First Experiences with Coaxial Borehole Heat Exchangers
2011 (English)In: Proceedings of the IIR Conference on Sources/Sinks alternative to the outside Air for HPs and AC techniques, International Institute of Refrigeration, 2011Conference paper (Refereed)
Some experiences with coaxial borehole heat exchanger prototypes are discussed here. Four different designs are described as they have been part of a research project at KTH: two pipe-inpipe annular designs, one multi-pipe and one multi-chamber design. A special focus is given to two of the prototypes, a pipe-in-pipe design with the external flow channel consisting of an annular cross section and partly insulated central pipe, and a multi-pipe design with twelve parallel peripheral pipes and an insulated central channel. The secondary fluid temperature profiles at low volumetric flow rates are presented for these two prototypes, measured with fiber optic cables during thermal response tests and allowing a detailed visualization of what happens along the heat exchanger depth. It is the first time this is carried out in these types of borehole heat exchangers. The measurements indicate good thermal performance and point at potential uses for these heat exchangers in different ground coupled applications.
Place, publisher, year, edition, pages
International Institute of Refrigeration, 2011.
Coaxial Borehole Heat Exchanger
IdentifiersURN: urn:nbn:se:kth:diva-73123ISBN: 978-2-913149-84-7OAI: oai:DiVA.org:kth-73123DiVA: diva2:488555
IIR Conference on Sources/Sinks alternative to the outside Air for HPs and AC techniques. Padua, Italy, April 5-6-7, 2011
QC 201204132012-02-012012-02-012012-04-13Bibliographically approved