Experimental determination of the g-functions of a small-scale geothermal borehole

Cimmino, Massimo; Bernier, Michel

doi:10.1016/j.geothermics.2015.03.006

Cited by 27 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As previously noted, the top BC appears to have been left uncontrolled in Cimmino and Bernier (2015), entailing natural convection on the surface. In those conditions, one may expect values between 1 to 6 W·m -2 ·K -1 .…”

Section: Influence Of the Top Convective Bcmentioning

confidence: 57%

“…In the reviewed literature, this is the only attempt to validate ground heat transfer models on the long-term. A discrepancy between the experimental TRF and the analytical one was observed, although the difference is comprised within the measurement uncertainty at a 95% confidence level (Cimmino & Bernier, 2015). The authors proposed an explanation for this observed difference based on the air temperature variation above the tank, though the proposed correction did not fully succeed in reproducing the observations.…”

Section: Introduction and Literature Reviewmentioning

confidence: 83%

“…However, due to the slow transitory nature of heat transfer phenomena in long boreholes, long-term experimental and monitoring studies have been scarce. This has been emphasized in the literature (Cimmino & Bernier, 2015;Cullin et al, 2015;Montagud et al, 2011;Spitler & Bernier, 2011, 2016. Spitler & Bernier (2016) identified the relevance and usefulness of long-term monitoring of thermally unbalanced borehole fields.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…Such laboratory apparatuses are attractive because the time scale is reduced and the tests can be performed in a controlled environment. A lab-scale apparatus was successfully built by Cimmino and Bernier (2015) based on a previous work (Salim Shirazi & Bernier, 2014). The authors obtained an experimental TRF that could be compared to a semi-analytical method.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

See 3 more Smart Citations

Design of a laboratory borehole storage model

Mazzotti¹,

Jiang²,

Monzó³

et al. 2018

Proceedings of the IGSHPA Research Track 2018

View full text Add to dashboard Cite

This paper presents the design process of a 4x4 Laboratory Borehole Storage (LABS) model through analytical and numerical analyses. This LABS is intended to generate reference Thermal Response Functions (TRFs) as well as to be a validation tool for borehole heat transfer models. The objective of this design process is to determine suitable geometrical and physical parameters for the LABS. An analytical scaling analysis is first performed and important scaling constraints are derived. In particular, it is shown that the downscaling process leads to significantly higher values for Neumann and convective boundary conditions whereas the Fourier number is invariant. A numerical model is then used to verify the scaling laws, determine the size of the LABS, as well as to evaluate the influence of top surface convection and borehole radius on generated TRFs. An adequate shape for the LABS is found to be a quarter cylinder of radius and height 1.0 m, weighing around 1.2 tonnes. Natural convection on the top boundary proves to have a significant effect on the generated TRF with deviations of at least 15%. This convection effect is proposed as an explanation for the difference observed between experimental and analytical results in Cimmino and Bernier (2015). A numerical reproduction of their test leads to a relative difference of 1.1% at the last reported time. As small borehole radii are challenging to reproduce in a LABS, the effect of the borehole radius on TRFs is investigated. It is found that Eskilson's radius correction (1987) is not fully satisfactory and a new correction method must be undertaken.

show abstract

Section: Influence Of the Top Convective Bcmentioning

confidence: 57%

Section: Introduction and Literature Reviewmentioning

confidence: 83%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Section: Introduction and Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Design of a laboratory borehole storage model

Mazzotti¹,

Jiang²,

Monzó³

et al. 2018

Proceedings of the IGSHPA Research Track 2018

View full text Add to dashboard Cite

show abstract

“…where , Information on the use of numerical Laplace transforms for the calculation of borehole wall temperatures is given in (Cimmino, et al 2013;Cimmino and Bernier 2014;Cimmino 2015;Cimmino and Bernier 2015). Segment-to-segment response factor increments are given by the finite line source solution (Claesson and Javed 2011;Cimmino and Bernier 2014).…”

Section: Ground Modelmentioning

confidence: 99%