Multipole method to calculate borehole thermal resistances in a borehole heat exchanger
(2011) In HVAC&R Research 17(6). p.895911 Abstract
 Groundsource heat pump systems use borehole heat exchangers to transfer heat to and from the ground. An important feature is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. The counterflow heat exchange between the pipes is also important, particularly for the axial temperature variation. These resistances can be represented by a thermal network between the pipes and the ground. The borehole thermal resistance is readily obtained from the network. A fairly intricate mathematical algorithm, the multipole method, to compute the temperature fields and, in particular, the thermal resistances is presented. This article focuses on the application of the model, leaving the... (More)
 Groundsource heat pump systems use borehole heat exchangers to transfer heat to and from the ground. An important feature is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. The counterflow heat exchange between the pipes is also important, particularly for the axial temperature variation. These resistances can be represented by a thermal network between the pipes and the ground. The borehole thermal resistance is readily obtained from the network. A fairly intricate mathematical algorithm, the multipole method, to compute the temperature fields and, in particular, the thermal resistances is presented. This article focuses on the application of the model, leaving the detailed mathematics to a background report. The formulas and methodology required for any particular case are presented in detail. The multipole method gives a solution with very high, and easily verified, accuracy for the steadystate heat conduction in a region perpendicular to the borehole axis. It is fairly straightforward to implement the algorithm in any design software. The computational time requirements are negligible. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/2494235
 author
 Claesson, Johan ^{LU} and Hellström, Göran ^{LU}
 organization
 publishing date
 2011
 type
 Contribution to journal
 publication status
 published
 subject
 in
 HVAC&R Research
 volume
 17
 issue
 6
 pages
 895  911
 publisher
 Taylor & Francis
 external identifiers

 wos:000299958700002
 scopus:84861622508
 ISSN
 10789669
 DOI
 10.1080/10789669.2011.609927
 language
 English
 LU publication?
 yes
 id
 9c14001fe5774801b2035d0aef74a160 (old id 2494235)
 date added to LUP
 20120604 14:15:23
 date last changed
 20170702 04:08:27
@article{9c14001fe5774801b2035d0aef74a160, abstract = {Groundsource heat pump systems use borehole heat exchangers to transfer heat to and from the ground. An important feature is the local thermal resistances between the heat carrier flow channels in the borehole and the surrounding ground. The counterflow heat exchange between the pipes is also important, particularly for the axial temperature variation. These resistances can be represented by a thermal network between the pipes and the ground. The borehole thermal resistance is readily obtained from the network. A fairly intricate mathematical algorithm, the multipole method, to compute the temperature fields and, in particular, the thermal resistances is presented. This article focuses on the application of the model, leaving the detailed mathematics to a background report. The formulas and methodology required for any particular case are presented in detail. The multipole method gives a solution with very high, and easily verified, accuracy for the steadystate heat conduction in a region perpendicular to the borehole axis. It is fairly straightforward to implement the algorithm in any design software. The computational time requirements are negligible.}, author = {Claesson, Johan and Hellström, Göran}, issn = {10789669}, language = {eng}, number = {6}, pages = {895911}, publisher = {Taylor & Francis}, series = {HVAC&R Research}, title = {Multipole method to calculate borehole thermal resistances in a borehole heat exchanger}, url = {http://dx.doi.org/10.1080/10789669.2011.609927}, volume = {17}, year = {2011}, }