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Author(s):	Eicker, Ursula; Thumm, Felix
Title:
Abstract:	In der Untersuchung wird die Effizienz oberflächennaher Geothermie Anlagen anhand von fünf Bauprojekten analysiert. Die Messergebnisse werden mit Auslegungsdaten der VDI 4640 verglichen, um die verwendeten Dimensionierungsrichtlinien zu überprüfen. Die messtechnischen Auswertungen der Beispielanlagen zeigen, dass die spezifischen Leistungen der Richtlinie nicht erreicht werden und die jährliche Heiz- und Kühlenergie pro Meter Sonde relativ niedrig ist. Um einen wirtschaftlichen Kälte- bzw. Wärmepreis zu erreichen, spielt die exakte Dimensionierung eine große Rolle. Wie in den Wirtschaftlichkeitsuntersuchungen gezeigt wird, sind aufgrund der geringen spezifischen Leistungen nur die Anlagen rentabel, die sehr geringe Investitionskosten haben. Eine Laufzeiterhöhung mit möglichst hohen spezifischen Leistungen ist daher von großer Bedeutung, um die oberflächennahen Geothermie möglichst ökologisch und ökonomisch sinnvoll zu nutzen. Energy efficiency and cost effectiveness of low depth geothermal heating and cooling for non-residential buildings. In the study the performance of low depth geothermal heat exchangers is analyzed for five building projects. The measurement results are compared with the German standard of the VDI 4640. The analysis shows that the specific power given in the standard is not achieved and the annual heating and cooling energy per meter borehole is quite low. In order to achieve an economic cooling or heating price, the exact dimensioning of the geothermal heat exchanger is a major criterion. As it is shown in the economic studies, only the systems with a very low invest are profitable. An increase of operating hours with a preferably high specific power is vitally important for a viable use of low depth geothermal energy in an ecological and economical way.
Source:	Bauphysik 34 (2012), No. 1
Page/s:	11-18
Language of Publication:	German

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