Article (Scientific journals)
Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment
Radioti, Georgia; Sartor, Kevin; Charlier, Robert et al.
2017In Applied Energy
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Keywords :
Undisturbed ground temperature; TRT rig insulation; Numerical modelling; Urbanisation effect; Design
Abstract :
[en] This paper presents temperature measurements in four Borehole Heat Exchangers (BHEs), equipped with fiber optics and located in a semi-urban environment (campus of the University of Liege, Belgium). A 3D numerical model is also presented to simulate the heat loss from the surrounding structures into the subsurface. The mean undisturbed ground temperature was estimated from data during the preliminary phase of a thermal response test (water circulation in the pipe loops), as well as from borehole logging measurements. The measurements during water circulation can significantly overestimate the ground temperature (up to 1.7 C in this case study) for high ambient air temperature during the test, resulting in an overestimation of the maximum extracted power and of the heat pump coefficient of performance (COP). To limit the error in the COP and the extracted power to less than 5%, the error in the undisturbed temperature estimation should not exceed ±1.5 °C and ±0.6 °C respectively. In urbanised areas, configurations of short BHEs (length < 40 m) could be economically advantageous (decreased installation and operation costs) compared to long BHEs, especially for temperature gradient lower than 0.05 °C/m.
Disciplines :
Energy
Geological, petroleum & mining engineering
Author, co-author :
Radioti, Georgia ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Sartor, Kevin ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
Charlier, Robert ;  Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Dewallef, Pierre ;  Université de Liège > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
Nguyen, Frédéric ;  Université de Liège > Département ArGEnCo > Géophysique appliquée
Language :
English
Title :
Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment
Publication date :
2017
Journal title :
Applied Energy
ISSN :
0306-2619
eISSN :
1872-9118
Publisher :
Elsevier Science
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
https://authors.elsevier.com/a/1V1ae15eieoWid
Available on ORBi :
since 15 May 2017

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