Efficiency evaluation of borehole heat exchangers in Nunavik, Québec, Canada.

Giordano, Nicolò; Riggi, Luca; Valentina, Simone Della

doi:10.18462/iir.icr.2019.0547

Cited by 2 publications

(4 citation statements)

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“…This is a very important topic to be addressed when deciding on a geothermal solution as well as when facing the environmental recovery of abandoned quarry lakes in defined hydrogeological contexts. In addition, this confirms the better performance of using a GWHP than a GSHP system, especially when a great heat exchange occurs, and the COP stands at around 4.00 at the end of the heating season [30][31][32][33], providing a total power of 2.410 MW. This also fits with the temperature profile inside quarry lakes, testifying to a well-defined stratification during summertime according to [33], where a higher temperature at the top (about 30 • C) and a lower temperature at the bottom (around 14 • C) occur.…”

Section: Discussionsupporting

confidence: 61%

“…According to [28], Ground Source Heat Pumps (GSHP) are more performant than Air Source Heat Pumps (ASHP), so that the Coefficient of Performance (COP) associated with heat pump systems is expected to be variable and low if fed with air, even if cheaper units can be installed [29]. On the other hand, among GSHP systems, it is possible to distinguish closed-loop systems (i.e., Borehole Heat Exchangers) and open-loop ones (i.e., groundwater, lake, river, and sea), of which the latter has the highest efficiency [30,31], also reaching a COP higher than 5.…”

Section: Discussionmentioning

confidence: 99%

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Alternative Use of Artificial Quarry Lakes as a Source of Thermal Energy for Greenhouses

Chicco

Comeau

Casasso

et al. 2021

Water

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In northern Italy, most greenhouses rely on gas or oil heaters which are sometimes subject to high operating costs. Several greenhouses are nearby quarry lakes, which are the legacy of the expansion of cities in the last decades, including Turin (NW Italy). About 20 quarry lakes were excavated close to the Po riverbed in the southern part of this urban area, along a belt of more than 30 km in length, with an overall volume exceeding 10 million m3 water. The study addresses these artificial lakes as a low enthalpy thermal energy source, potentially providing heat to surrounding agri-business buildings. Detailed temperature monitoring of a large lake quarry was conducted over two years at different depths, measuring the surrounding groundwater level as well. Two different behaviors of the lake during the winter and summer seasons enabled the definition of a quite low water mixing process between the surrounding aquifers and the lake (in the range of 2–4 °C). An evaluation of the heat extraction potential using the lake as a heat source, depending on water temperature and its volume, and a qualitative comparison with groundwater systems are proposed. This study contributes to increasing knowledge on an overlooked resource for sustainable heating.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Alternative Use of Artificial Quarry Lakes as a Source of Thermal Energy for Greenhouses

Chicco

Comeau

Casasso

et al. 2021

Water

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“…To date, several studies have assessed the geothermal potential and the economic viability of GCHP in Nunavik mostly focusing on the ground heat transfer aspects (see, for example, Refs. [5] to [9] introduced in the introduction). However, the present paper provides a new perspective by exploring more thoroughly the interactions between heat exchanges in the ground, electrical energy production and storage, and the behavior of the different components of the system during each simulation time step of a ten-year operation.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

“…Giordano et al simulated vertical ground heat exchangers (GHE) for ten years. They showed that it was possible to extract 35 W/m from the ground for nine months of each year with 30 m-deep boreholes, when considering a minimum ground heat exchanger temperature of -10 °C [9]. Gunawan et al assessed the geothermal potential in the community of Kuujjuaq and performed an economic analysis of several energy scenarios [3].…”

mentioning

confidence: 99%