Parametric study for the long term energetic performance of geothermal energy piles

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

1 Sitaatiot (Scopus)
62 Lataukset (Pure)

Abstrakti

Geothermal energy constitutes an important renewable resource that will become increasingly prominent in future constructions. A common method of extraction and usage consists of installing, inside the foundation piles of buildings, U-shaped heat exchangers called "energy piles". In this paper such installations are addressed by means of a full parametric study, performed for a hall-type commercial building in a cold climate. By computing the transient heat transfer between energy piles and ground for a period of 20 years, guidelines for a preliminary sizing of the geothermal system as a whole are provided. These are valid for this specific building and climate, for a clay-type soil and without assuming thermal storage. A highly nonlinear behaviour of the expected yield in relation to pile separation and evaporator extraction power is observed. Furthermore, 15m-long piles are found to be more efficient than those with double length, a smaller extraction power seems to be more favourable and differences in the pile diameter have little impact for heat transfer. A geothermal system sizing guide, which is useful for a preliminary quantitative test prior to any installation, is introduced. Even though our specific results are valid only for a commercial hall-type building in Finland, our procedure is qualitatively general and can be utilized for any given building type and climate zone.

AlkuperäiskieliEnglanti
Otsikko1st Nordic conference on Zero Emission and Plus Energy Buildings, 6-7 November 2019, Trondheim, Norway
KustantajaInstitute of Physics Publishing
DOI - pysyväislinkit
TilaJulkaistu - 1 tammik. 2019
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
TapahtumaNordic Conference on Zero Emission and Plus Energy Buildings - Trondheim, Norja
Kesto: 6 marrask. 20197 marrask. 2019
Konferenssinumero: 1

Julkaisusarja

NimiIOP Conference Series: Earth and Environmental Science
KustantajaInstitute of Physics Publishing
Numero1
Vuosikerta352
ISSN (painettu)1755-1307

Conference

ConferenceNordic Conference on Zero Emission and Plus Energy Buildings
LyhennettäZEB+
Maa/AlueNorja
KaupunkiTrondheim
Ajanjakso06/11/201907/11/2019

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