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Article: Computer simulation of borehole ground heat exchangers for geothermal heat pump systems

TitleComputer simulation of borehole ground heat exchangers for geothermal heat pump systems
Authors
KeywordsBorefield
Borehole
Ground Heat Exchanger
Ground Source Heat Pump
Thermal Resistance
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/renene
Citation
Renewable Energy, 2008, v. 33 n. 6, p. 1286-1296 How to Cite?
AbstractComputer simulation of borehole ground heat exchangers used in geothermal heat pump systems was conducted using three-dimensional implicit finite difference method with rectangular coordinate system. Each borehole was approximated by a square column circumscribed by the borehole radius. Borehole loading profile calculated numerically based on the prescribed borehole temperature profile under quasi-steady state conditions was used to determine the ground temperature and the borehole temperature profile. The two coupled solutions were solved iteratively at each time step. The simulated ground temperature was calibrated using a cylindrical source model by adjusting the grid spacing and adopting a load factor of 1.047 in the difference equation. With constant load applied to a single borehole, neither the borehole temperature nor the borehole loading was constant along the borehole. The ground temperature profiles were not similar at different distances from the borehole. This meant that a single finite difference scheme was not sufficient to estimate the performance of a borefield by superposition. The entire borefield should be discretized simultaneously. Comparison was made between the present method and the finite line source model with superposition. The discrepancies between the results from the two methods increased with the scale of borefield. The introduction of time schedule revealed a discrepancy between the load applied to the ground heat exchanger and that transferred from the borehole to the ground, which was usually assumed to be the same when using analytical models. Hence, in designing a large borefield, the present method should give more precise results in dynamic simulation. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/156940
ISSN
2015 Impact Factor: 3.404
2015 SCImago Journal Rankings: 1.961
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLee, CKen_US
dc.contributor.authorLam, HNen_US
dc.date.accessioned2012-08-08T08:44:38Z-
dc.date.available2012-08-08T08:44:38Z-
dc.date.issued2008en_US
dc.identifier.citationRenewable Energy, 2008, v. 33 n. 6, p. 1286-1296en_US
dc.identifier.issn0960-1481en_US
dc.identifier.urihttp://hdl.handle.net/10722/156940-
dc.description.abstractComputer simulation of borehole ground heat exchangers used in geothermal heat pump systems was conducted using three-dimensional implicit finite difference method with rectangular coordinate system. Each borehole was approximated by a square column circumscribed by the borehole radius. Borehole loading profile calculated numerically based on the prescribed borehole temperature profile under quasi-steady state conditions was used to determine the ground temperature and the borehole temperature profile. The two coupled solutions were solved iteratively at each time step. The simulated ground temperature was calibrated using a cylindrical source model by adjusting the grid spacing and adopting a load factor of 1.047 in the difference equation. With constant load applied to a single borehole, neither the borehole temperature nor the borehole loading was constant along the borehole. The ground temperature profiles were not similar at different distances from the borehole. This meant that a single finite difference scheme was not sufficient to estimate the performance of a borefield by superposition. The entire borefield should be discretized simultaneously. Comparison was made between the present method and the finite line source model with superposition. The discrepancies between the results from the two methods increased with the scale of borefield. The introduction of time schedule revealed a discrepancy between the load applied to the ground heat exchanger and that transferred from the borehole to the ground, which was usually assumed to be the same when using analytical models. Hence, in designing a large borefield, the present method should give more precise results in dynamic simulation. © 2007 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/reneneen_US
dc.relation.ispartofRenewable Energyen_US
dc.subjectBorefielden_US
dc.subjectBoreholeen_US
dc.subjectGround Heat Exchangeren_US
dc.subjectGround Source Heat Pumpen_US
dc.subjectThermal Resistanceen_US
dc.titleComputer simulation of borehole ground heat exchangers for geothermal heat pump systemsen_US
dc.typeArticleen_US
dc.identifier.emailLam, HN:hremlhn@hkucc.hku.hken_US
dc.identifier.authorityLam, HN=rp00132en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.renene.2007.07.006en_US
dc.identifier.scopuseid_2-s2.0-39349108931en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-39349108931&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume33en_US
dc.identifier.issue6en_US
dc.identifier.spage1286en_US
dc.identifier.epage1296en_US
dc.identifier.isiWOS:000254678100015-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLee, CK=36882471800en_US
dc.identifier.scopusauthoridLam, HN=7202774923en_US
dc.identifier.citeulike9387672-

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