A methodology for the calculation of response functions for geothermal fields with arbitrarily oriented boreholes: Part 1
2016 (English)In: Renewable energy, ISSN 0960-1481, E-ISSN 1879-0682, Vol. 86, 1380-1393 p.Article in journal (Refereed) Published
This article is part of a two paper series presenting a development in the methodology for the calculation of response functions for geothermal fields with arbitrarly oriented boreholes. In the method utilized, boreholes are represented as sets of stacked line sources and the borehole temperatures are calculated by means of a superposition procedure. This particular paper is focused on the efficient computation of the building block of this approach, which is the non dimensional mean temperature response g~(t) along a finite line due to a step heat injection along a second finite line, where the lines are arbitrarily oriented. The speed in computing this function is critical for the applicability of the method. The solution proposed to achieve the required performance is a hybrid approach involving analytical, numerical and implementation aspects: an analytical procedure to simplify the expression of g~(t) was developed, the resulting problem was solved with a tailored numerical method, and the algorithm was implemented using a high-performing programming language. Each of these aspects showed to have a great impact from a performance perspective. The performance achieved in the calculation of g~(t) enables the integration of this method within the scheme utilized for g-functions calculation.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 86, 1380-1393 p.
inclined boreholes, g-functions, computational efficiency
Research subject Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-166216DOI: 10.1016/j.renene.2015.09.056ISI: 000364248300133ScopusID: 2-s2.0-84943614039OAI: oai:DiVA.org:kth-166216DiVA: diva2:809826
Updated from Manuscript to Article. QC 201601262015-05-052015-05-052016-01-26Bibliographically approved