Fluid and borehole wall temperature profiles in vertical geothermal boreholes with multiple U-tubes

Cimmino, Massimo

doi:10.1016/j.renene.2016.04.067

Cited by 22 publications

(18 citation statements)

References 31 publications

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“…Assuming steady-state heat transfer between the fluid circulating in a borehole and its borehole wall, the fluid temperature variations in the borehole are given by the following system of differential equations (Cimmino, 2016):…”

Section: Figurementioning

confidence: 99%

“…In Cimmino (2015), g-functions were calculated for single U-tube boreholes connected in parallel. In Cimmino (2016), fluid and borehole wall temperature profiles were calculated for a single borehole with multiple U-tubes. In the present work, g-functions are calculated for boreholes -with potentially multiple U-tubes -in any configuration of parallel and series connections between boreholes.…”

Section: Introductionmentioning

confidence: 99%

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G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

Cimmino¹

2018

Proceedings of the IGSHPA Research Track 2018

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

Cimmino¹

2018

Proceedings of the IGSHPA Research Track 2018

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“…An analytical method was recently proposed by Cimmino (2016) for boreholes with any number of U-tubes and varying borehole wall temperatures. The solution is adapted here for single U-tube boreholes.…”

Section: Borehole Modelmentioning

confidence: 99%

Examination of Ambient Temperature Variations Effects on Predicted Fluid Temperatures in Vertical Boreholes

Cimmino¹

2017

Proceedings of the IGSHPA Technical/Research Conference and Expo 2017

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“…Mensah et al [16] proposed a numerical simulation on the optimal design of boreholes based on the building load and validated the simulation analysis with the experimental data. Cimmino [17] presented an analytical model by using Laplace transform method to calculate fluid temperature in boreholes. Their proposed model had a good agreement with finite difference method.…”

Section: Introductionmentioning

confidence: 99%

A simplified analytical model to predict heating performance of single U-tube ground heat exchangers

et al. 2020

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In underground U-tube heat exchangers (boreholes) it is important to predict its heating performance to design and select the proper parameters such as length, diameter, material etc. to have an optimized borehole from the point of view of heat capacity and economical aspects. For this reason, having trusty equations is vital to foresee borehole heating performance and applying it in design issues. In this study a single vertical U-tube borehole with constant wall temperature is considered and analytical equations for temperature distribution in the surrounding ground around the borehole is evaluated based on one and two dimensional heat conduction respectively. The analytical equation is compared to experimental data for a borehole with 50 m depth in which warm water of 40 C is pumped into it a time period of 120 hours and the heat transfer rate per unit length is recorded. The comparison between analytical expression and experimental data shows a good agreement between them. Also the borehole entropy generation number is studied and the optimized parameters are evaluated to minimize it. It is concluded that for the considered borehole, entropy generation number is decreased by increasing its length and by decreasing the borehole radius and pipe outer radius.

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Fluid and borehole wall temperature profiles in vertical geothermal boreholes with multiple U-tubes

Cited by 22 publications

References 31 publications

G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

G-functions for bore fields with mixed parallel and series connections considering axial fluid temperature variations

Examination of Ambient Temperature Variations Effects on Predicted Fluid Temperatures in Vertical Boreholes

A simplified analytical model to predict heating performance of single U-tube ground heat exchangers

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