Distributed Temperature Measurements on a Multi-pipe Coaxial Borehole Heat Exchanger
2011 (English)In: IEA Heat Pump Conference, International Energy Agency , 2011, 4.19- p.Conference paper (Refereed)
The first experiences with a multi-pipe borehole heat exchanger prototype consisting of an insulated central pipe and twelve parallel peripheral pipes are described. Secondary fluid distributed temperature measurements along the borehole depth, being the only ones of its kind in this type of heat exchanger, are presented and discussed. The measurements are carried out with fiber optic cables during heat injection into the ground, giving a detailed visualization of what happens both along the central and peripheral flow channels. The heat exchange with the ground mainly occurs along the peripheral channels and an indication of almost no thermal short circuiting, even while having large temperature differences between the down and upwards channels, is observed.
Place, publisher, year, edition, pages
International Energy Agency , 2011. 4.19- p.
ground source heat pumps, borehole heat exchanger, coaxial
IdentifiersURN: urn:nbn:se:kth:diva-73108OAI: oai:DiVA.org:kth-73108DiVA: diva2:488552
10th International Energy Agency Heat Pump Conference. Tokyo, Japan. May 16 – 19, 2011
QC 201204102012-02-012012-02-012012-04-10Bibliographically approved