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Effects of different re-injection systems on the thermal affected zone (TAZ) modelling for open-loop groundwater heat pumps (GWHPs)

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Abstract

Open-loop groundwater heat pump (GWHP) technology has experienced increased implementation throughout several parts of the world. Water is discharged into an aquifer for cooling and heating buildings, which has the potential to cause, even in the short term, significant environmental impacts associated with groundwater thermal interference, particularly in shallow aquifers. The objectives of this study were to investigate alternatives to traditional drilled wells for re-injection and dispersion of water in aquifers downstream of GWHP systems. In particular, we evaluated the potential for reverse use of commercial gabion draining in various types of ground configuration, geometry, and interconnection with prefabricated vertical drain systems. Results showed the use of gabiondrains instead of re-injection wells tended to develop a thermal affected zone (TAZ), which primarily affected the surficial portion of the aquifer. TAZ development served an important role in decreasing thermal feedback risks, and reduced the relative distance between abstraction and re-injection in well-doublet schemes, in cases where the abstraction occurred in deeper portions of the aquifer.

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Authors and Affiliations

  1. Department of Environment, Land and Infrastructure Engineering (DIATI), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Turin, Italy

    Stefano Lo Russo, Glenda Taddia & Elena Cerino Abdin

  2. Department of Energy (DENERG), Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Turin, Italy

    Vittorio Verda

Authors
  1. Stefano Lo Russo
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  2. Glenda Taddia
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  3. Elena Cerino Abdin
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  4. Vittorio Verda
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Correspondence to Stefano Lo Russo.

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Lo Russo, S., Taddia, G., Cerino Abdin, E. et al. Effects of different re-injection systems on the thermal affected zone (TAZ) modelling for open-loop groundwater heat pumps (GWHPs). Environ Earth Sci 75, 48 (2016). https://doi.org/10.1007/s12665-015-4822-8

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