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Response functions and thermal influence for various multiple borehole configurations in ground coupled heat pump systems
Metka Pešl, Darko Goričanec, 2007, original scientific article

Abstract: Ground coupled heat pump (GCHP) utilizes the immense renewable storage capacity of the ground as a heat source or sink to provide space heating, cooling, and domestic hot water. GCHP systems are generally comprised of watersource heat pumps and ground heat exchangers (GHEs). Consisting of closedloop of pipes buried in boreholes, ground heat exchangers (GHEs) are devised for extraction or injection of thermal energy from/into the ground. Despite the low energy and lower maintenance benefits of ground-source heat pump systems, little work has been undertaken in detailed analysis. Many models, either numerical or analytical, have been proposed to analyze the thermal response of vertical heat exchangers that are used in ground coupled heat pump systems (GCHP). In both approaches, most of the models are valid after few hours of operation since they neglect the heat capacity of the borehole. In this paper, we present for three various multiple borehole configurations a comparison between g-functions, which will be calculated after an analytical model of final line source and g-functions, obtain with numerical model derived from the work of Eskilson. A case study is presented to show how the ground temperature changes with time for various multiple borehole configurations.
Keywords: geothermal heat exchanger, heat transfer, heat conduction, thermal influence
Published: 31.05.2012; Views: 1086; Downloads: 24
URL Link to full text

3.
Odzivne funkcije in toplotni vpliv različnih konfiguracij vertikalnih toplotnih prenosnikov v vrtini v sistemih zemeljskih toplotnih črpalk
Metka Pešl, 2016, master's thesis

Abstract: V magistrskem delu je temeljni poudarek na treh različnih konfiguracijah vrtin za katere so prikazane grafične primerjave g-funkcij, ki so izračunane z analitičnim modelom končnega črtnega vira in določene z numeričnim modelom Eskilsona. Rezultati kažejo, da analitična rešitev sledi zelo dobro numeričnim rezultatom. Predstavljena je tudi študija, kako se temperatura zemlje s časom spreminja v primeru različnih konfiguracij vrtin, če toploto odvajamo iz zemlje (ogrevanje) in če toploto dovajamo v zemljo (hlajenje). Rezultati kažejo, da je sprememba temperaturnega polja odvisna od razdalje med vrtinami. Toplotni vpliv med vrtinami je skoraj neopazen v začetku delovanja sistema s toplotno črpalko, vendar pa s časom postaja vse večji, dokler se ne doseže stacionarno stanje. Toplotni vpliv med vrtinami pada z naraščajočo razdaljo med njimi in je zanemarljiv, če je razdalja med vrtinami večja od dolžine vrtine. Na koncu magistrskega dela je za primer enodružinske hiše izvedeno dimenzioniranje toplotne črpalke, ki omogoča ogrevanje, hlajene in pripravo tople sanitarne vode. Vir toplote je zemlja z vertikalnima toplotnima prenosnikoma v vrtini. Vračilna doba naložbe je 13,7 leta.
Keywords: geotermalna energija, toplotna črpalka zemlja/voda, vertikalni toplotni prenosnik v vrtini, temperaturno polje, brezdimenzijske temperaturne odzivne g-funkcije
Published: 25.07.2016; Views: 509; Downloads: 33
.pdf Full text (1,85 MB)

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