Borehole heat exchanger with nanofluids as heat carrier

Hanak, Dawid P.; Roselli, Carlo; Sasso, Maurizio; Channabasappa, Umavathi Jawali

doi:10.1016/j.geothermics.2017.11.005

Cited by 93 publications

(34 citation statements)

References 33 publications

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“…In addition to improvement in heat transfer, using nanofluids can reduce the size of systems. Diglio et al [47] investigated the effect of using nanofluid as heat carrier instead of conventional fluid, mixture of water and ethylene glycol, on a borehole heat exchanger. In this study, various nano particles such as graphite, alumina, aluminium and etc were used in low concentrations.…”

Section: Applications Of Nanofluids In Geothermal Systemsmentioning

confidence: 99%

“…1% concentration [47] In another study carried out by Deneshipour et al [49], two nanofluids including 2 3 /water and CuO/water were used in geothermal borehole heat exchanger as circuit fluids. Numerical simulation by applying Reynolds Averaged Navier-Stokes was performed to analyze the effect of various factors.…”

Section: Figure 5 Borehole Length Reduction For Various Nanofluids Inmentioning

confidence: 99%

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Applications of nanofluids in geothermal: A review

Ahmadi¹,

Ramezanizadeh²,

Nazari³

et al. 2018

MMEP

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Geothermal energy is one of the most suitable sources of energy since it is possible to use it continuously for generating power and providing heat. Firstly, recent trends in geothermal energy are discussed and compared with other types of renewable energies. According to the results of this section, geothermal energy is an attractive choice for future power generation due to its low carbon dioxide emission and levelzied cost of electricity in comparison with other renewable energy sources. Afterwards, applications of nanofluid in geothermal-based energy systems are reviewed and their important results are represented. On the basis of literature review, using nanofluids can result in augment in geothermal systems. The enhancement is dependent on several factors including the type of nanofluid, concentration and system specification. According to the results of a study, the effect of using nanofluid on heat transfer rate became more significant at higher flow rates. In addition, using nanofluids can reduce the size of heat exchangers used in geothermal-based system. The main effects of employing nanofluids is increase in convective heat transfer and pressure loss.

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Section: Applications Of Nanofluids In Geothermal Systemsmentioning

confidence: 99%

Section: Figure 5 Borehole Length Reduction For Various Nanofluids Inmentioning

confidence: 99%

Applications of nanofluids in geothermal: A review

Ahmadi¹,

Ramezanizadeh²,

Nazari³

et al. 2018

MMEP

View full text Add to dashboard Cite

show abstract

“…To boost thermophysical properties such as density, viscosity, precise heat transfer, and thermal conductivity, nanofluids apply to nanoscale particles suspended in traditional heat transfer fluids such as ethylene glycol, oil, and water. Nanofluid applications are now encountered successfully in a wide variety of sectors, including, though not limited to, impingement jets, heat exchangers, clean energy, automobiles, electronic chip cooling, nuclear reactors, heating and tempering, combustion, lubrication, and medication [3][4][5][6][7][8][9]. Patterson and Imberger [10] claimed to have undertaken one of the first studies on the movement of fluid inside enclosures.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal and Entropy Investigation of Ag/MgO/H2O Hybrid Nanofluid Natural Convection in a Novel Shape of Porous Cavity

et al. 2021

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In this study, a new cavity form filled under a constant magnetic field by Ag/MgO/H2O nanofluids and porous media consistent with natural convection and total entropy is examined. The nanofluid flow is considered to be laminar and incompressible, while the advection inertia effect in the porous layer is taken into account by adopting the Darcy–Forchheimer model. The problem is explained in the dimensionless form of the governing equations and solved by the finite element method. The results of the values of Darcy (Da), Hartmann (Ha) and Rayleigh (Ra) numbers, porosity (εp), and the properties of solid volume fraction (ϕ) and flow fields were studied. The findings show that with each improvement in the Ha number, the heat transfer rate becomes more limited, and thus the magnetic field can be used as an outstanding heat transfer controller.

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“…In the recent years, nanofluid has many applications in solar energy systems, nuclear reactors, heat exchangers, and so on [11][12][13][14][15][16][17][18][19]. Bhatti et al [20] discussed the impacts of chemical reaction and nonlinear thermal radiation on unsteady 3D boundary layer flow of a viscous nanofluid having gyrotactic microorganisms through a stretching porous cylinder.…”

Section: Introductionmentioning

confidence: 99%

Double-Diffusive of a Nanofluid in a Rectangle-Shape Mounted on a Cavity Saturated by Heterogeneous Porous Media

Aly

Mahmoud

Ahmad

et al. 2021

Journal of Mathematics

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This study presents numerical simulations on double-diffusive flow of a nanofluid in two cavities connected with four vertical gates. Novel shape of an outer square shape mounted on a square cavity by four gates was used. Heterogeneous porous media and Al 2 O 3 -water nanofluid are filled in an inner cavity. Outer rectangle shape is filled with a nanofluid only, and its left walls carry high temperature T h and high concentration C h . The right walls of a rectangle shape carry low temperature T c and low concentration C c and the other walls are adiabatic. An incompressible smoothed particle hydrodynamics (ISPH) method is applied for solving the governing equations of velocities, temperature, and concentration. Results are introduced for the effects of a buoyancy ratio − 2 ≤ N ≤ 2 , Darcy parameter 10 − 3 ≤ Da ≤ 10 − 5 , solid volume fraction 0 ≤ ϕ ≤ 0.05 , and porous levels. Main results are indicated in which the buoyancy ratio parameter adjusts the directions of double-diffusive convection flow in an outer shape and inner cavity. Adding more concentration of nanoparticles reduces the flow speed and maximum of the velocity field. Due to the presence of a porous medium layer in an inner cavity, the Darcy parameter has slight changes inside the rectangle shape.

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Borehole heat exchanger with nanofluids as heat carrier

Cited by 93 publications

References 33 publications

Applications of nanofluids in geothermal: A review

Applications of nanofluids in geothermal: A review

Hydrothermal and Entropy Investigation of Ag/MgO/H2O Hybrid Nanofluid Natural Convection in a Novel Shape of Porous Cavity

Double-Diffusive of a Nanofluid in a Rectangle-Shape Mounted on a Cavity Saturated by Heterogeneous Porous Media

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