Special Issue: New Trends in Enhanced, Hybrid and Integrated Geothermal Systems

Nathwani, Jatin

doi:10.3390/app11093765

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The conductor pipe in the casing usually has a high thermal conductivity, thus making its thermal resistance negligible. (5) The cement/grout filled in the casing assumes to have the same order of magnitude as the ground in terms of thermophysical properties, so there is no need to consider the cement separately from the ground. (6) Thermophysical properties of the grout are assumed to be constant, since the temperature variation gives minimal influences on the properties.…”

Section: Methodsmentioning

confidence: 99%

“…Last, the exact solution of θ by the Duhamel's theorem is calculated by substituting Φ into Equation (5). The final expression of θ is…”

Section: Use Of Duhamel's Theoremmentioning

confidence: 99%

“…Unlike other renewable energy sources (e.g., solar, wind, tidal), geothermal energy can be extracted regardless of meteorological conditions, thus rendering it a stable source of energy [2]. Worldwide applications of direct use of geothermal energy was recently reviewed in [3,4]; some of the new trends in various kinds of geothermal systems were listed in [5].…”

Section: Introductionmentioning

confidence: 99%

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An Analytical Model for Transient Heat Transfer with a Time-Dependent Boundary in Solar- and Waste-Heat-Assisted Geothermal Borehole Systems: From Single to Multiple Boreholes

Hefni

Hassani

et al. 2021

Applied Sciences

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With the increasing engineering applications of geothermal borehole heat exchangers (BHEs), accurate and reliable mathematical models can help advance their thermal design and operations. In this study, an analytical model with a time-dependent heat flux boundary condition on the borehole wall is developed, capable of predicting the thermal performance of single, double, and multiple closed-loop BHEs, with an emphasis on solar- and waste-heat-assisted geothermal borehole systems (S-GBS and W-GBS) for energy storage. This analytical framework begins with a one-dimensional transient heat conduction problem subjected to a time-dependent heat flux for a single borehole. The single borehole scenario is then extended to multiple boreholes by exploiting lines of symmetry (or thermal superposition). A final expression of the temperature distribution along the center line is attained for single, double, and multiple boreholes, which is verified with a two-dimensional finite-element numerical model (less than 0.7% mean absolute deviation) and uses much lesser computational power and time. The analytical solution is also validated against a field-scale experiment from the literature regarding the borehole and ground temperatures at different time frames, with an absolute error below 6.3%. Further, the thermal performance of S-GBS and W-GBS is compared for a 3-by-3 borehole configuration using the analytical model to ensure its versatility in thermal energy storage. It is concluded that our proposed analytical framework can rapidly evaluate closed-loop geothermal BHEs, regardless of the numbers of boreholes and the type of the heat flux on the borehole wall.

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Section: Methodsmentioning

confidence: 99%

“…Last, the exact solution of θ by the Duhamel's theorem is calculated by substituting Φ into Equation (5). The final expression of θ is…”

Section: Use Of Duhamel's Theoremmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Analytical Model for Transient Heat Transfer with a Time-Dependent Boundary in Solar- and Waste-Heat-Assisted Geothermal Borehole Systems: From Single to Multiple Boreholes

Hefni

Hassani

et al. 2021

Applied Sciences

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“…To overcome or at least address these challenges, it is essential to explore and implement effective, cost-competitive, and practical solutions or alternatives. The worldwide energy demand is dramatically increasing for a variety of reasons, the two most important being population growth and increasing living standards requiring greater energy inputs [1,3]. Clean, renewable, and eco-friendly energy sources (e.g., solar, wind, geothermal, biofuel, hydro) can not only help us to meet global energy needs, but also reduce the negative consequences of climate change (CC), mitigate the threat of global warming, and achieve sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Special Issue: New Developments and Prospects in Clean and Renewable Energies

Dehghani-Sanij,

Kashkooli

2023

Applied Sciences

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Numerical Analysis of Thermal, Fluid, and Electrical Performance of a Photovoltaic Thermal Collector at New Micro-Channels Geometry

Hoseinzadeh

Garcia

2021

Journal of Energy Resources Technology

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In the present paper, different paths (direct, spiral, and curved) for water flow in a photovoltaic /thermal (PV/T) system are studied and they are compared together. The intensity of radiation to the cell surface is taken 800 W/m2, and the fluid flow is considered to be laminar in the microchannels. The PV cell absorbing radiation is of an aluminum type. The numerical solution of the three geometries is carried out using the finite volume method using ANSYS-Fluent software. The pressure decomposition, momentum and energy discretization, and the solution of the pressure-velocity coupling are performed based on the standard method, second-order upwind method, and the Semi-Implicit Method for Pressure Linked Equations (SIMPLE) method, respectively. The convergence factor is considered to be respected and for continuity and energy equations. The results indicate that the cell surface temperature and the outlet fluid temperature decrease by increasing the Reynolds (Re) number. Moreover, electricity efficiency increases with increased Reynolds number. The curved path has the highest electrical efficiency in compersion to the other two paths. The fluid pressure drop of the curved path in Re = 600 is 4% and 1.3% higher than the direct and spiral paths, respectively.

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Special Issue: New Trends in Enhanced, Hybrid and Integrated Geothermal Systems

Abstract: The most important challenge for the global energy sector is to rapidly transform the entire system to one less dependent on fossil fuels and so reduce the harmful effects on the climate [...]

Cited by 3 publications

References 10 publications

An Analytical Model for Transient Heat Transfer with a Time-Dependent Boundary in Solar- and Waste-Heat-Assisted Geothermal Borehole Systems: From Single to Multiple Boreholes

An Analytical Model for Transient Heat Transfer with a Time-Dependent Boundary in Solar- and Waste-Heat-Assisted Geothermal Borehole Systems: From Single to Multiple Boreholes

Special Issue: New Developments and Prospects in Clean and Renewable Energies

Numerical Analysis of Thermal, Fluid, and Electrical Performance of a Photovoltaic Thermal Collector at New Micro-Channels Geometry

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