Performance investigation on a thermal energy storage integrated solar collector system using nanofluid

Afolabi, Lukmon Owolabi; Al-Kayiem, Hussain H.; Baheta, Aklilu Tesfamichael

doi:10.1002/er.3657

Cited by 33 publications

(17 citation statements)

References 15 publications

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“…In the past years, nanofluids as working fluids were widely utilized in direct absorption solar collector 16 . Generally, nanofluids are prepared by dispersing nanoparticles into base fluid, which is regarded as an effective way to enhance light absorption and heat transfer characteristics of base fluid 14,17 . In all kinds of nanoparticles, carbon‐based nanomaterials have advantages of high thermal conductivity and low spectral transmittance, and thus they possess better application prospect 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

et al. 2020

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Summary The development of high‐efficient working fluids with excellent photo‐thermal conversion and heat storage properties is an important factor to solar thermal utilization. In this work, magnetic phase change microcapsules (MPCMs) were prepared via in situ polymerization, where melamine‐formaldehyde (MF) resin and octadecane containing oleic acid‐coated magnetic nanoparticles (OA‐MNs) were used as the shell and core, respectively. The microstructure, magnetic and thermal properties of MPCMs were investigated, and the photo‐thermal conversion and heat storage properties of slurries prepared by dispersing MPCMs into multi‐walled carbon nanotubes (MWCNTs) nanofluids were explored. The encapsulation efficiency of MPCMs with superparamagnetic nature achieved 63.51%, while the thermal conductivity of MPCMs was slightly increased with regard to phase change microcapsules (PCMs) and the thermal stability of octadecane was enhanced after being encapsulated. Moreover, the slurry with 0.01 wt% MWCNTs and 15 wt% MPCMs had the optimal photo‐thermal conversion properties and thermal storage capacity. Beyond that, the recycled MPCMs represented excellent recyclability. Our research demonstrated that the MWCNTs‐dispersed MPCMs slurry is one of ideal working fluids with excellent photo‐thermal conversion and heat storage characteristics for direct absorption solar collector.

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Section: Introductionmentioning

confidence: 99%

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

et al. 2020

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“…The intermittent sustainable energy can be effectively stored in the thermal energy storage materials. Therefore, the thermal energy storage (TES) technologies can effectively bridge the energy gap between demand and supply . There have been a number of sensible thermal energy storage media, for example, molten salts, water, soil, rock, oil.…”

Section: Introductionmentioning

confidence: 99%

Optimal research of annular baffle for heat‐discharging performance of single thermal storage tank with molten salt

Zhang

Shi

et al. 2020

Int J Energy Res

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The single thermal energy storage tank (STEST) has been extensively investigated because of the advantage of cost and efficiency. This research presents heat discharging performance of STEST using coil heat exchanger (CHE) with annular baffle at different working conditions. The heat discharging performance, flow field and temperature distribution of different parameters of the annular baffle are presented and discussed. The results show that the heat discharging time decreases with an increase inlet air velocity of the CHE. The heat discharging efficiency is up to 95.7% in this study, and the heat discharging time can reach to 18.7 hours. In addition, optimal dimensionless diameters of annular baffle are D b /D t = 0.6, H s /H t = 0.075 and H x /H t = 0.050 (H s is the height from the top of baffle to the top of tank. H t is the height of the tank. H x is the height from bottom of the baffle to the bottom of the tank). The efficiency of heat discharging process can be enhanced with optimal dimensions of the annular baffle. This study presents a direct practicable guide to design the STEST. K E Y W O R D S annular baffle, coil heat exchanger, heat discharging, single thermal energy storage tank

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“…The Buongiorno model therefore while it ignores volume fraction effects does compensate for this by a discrete equation for the nano-particle concentration diffusion and is more comprehensive therefore for complex flow simulations where Brownian motion can be modelled. Many recent studies have been communicated on nanofluid solar pumps and collector systems including Shamshirgaran et al [15] (on energy dynamics of copper nanofluid flat plate collectors), Owlabi et al [16] (on integrated silver oxide doped nano-solar cells),…”

Section: Introductionmentioning

confidence: 99%

Peristaltic pumping of magnetic nanofluids with thermal radiation and temperature-dependent viscosity effects: Modelling a solar magneto-biomimetic nanopump

et al. 2019

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Nanofluids have shown significant promise in the thermal enhancement of many industrial systems. They have been developed extensively in energy applications in recent years. Solar energy systems are one of the most promising renewables available to humanity and these are increasingly being redesigned to benefit from nanofluids. Most designs of solar collectors involve fixed (rigid) geometries which may be cylindrical, parabolic, tubular or flat-plate types. Modern developments in biomimetics have identified that deformable conduit structures may be beneficial for sustainable energy systems. Motivated by these aspects, in the current work we present a novel model for simulating a biomimetic peristaltic solar magnetohydrodynamic nanofluid-based pump. The working fluid is a magnetized nanofluid which comprises a base fluid containing suspended magnetic nano-particles. The novelty of the present work is the amalgamation of biomimetics (peristaltic propulsion), magnetohydrodynamics and nanofluid dynamics to produce a hybrid solar pump system model. Heat is transferred via distensibility of the conduit in the form of peristaltic thermal waves and buoyancy effects. An externally applied magnetic field achieves the necessary circuit design for generating Lorentzian magnetic body force in the fluid. A variable viscosity modification of the Buongiorno nanofluid model is employed which features thermophoretic body force and Brownian dynamic effects. To simulate solar loading conditions a thermal radiative flux model is also deployed. An asymmetric porous channel is investigated with multiple amplitudes and phases for the wall wavy motion. The channel also contains a homogenous, isotropic porous medium which is simulated with a modified Darcy model. Heat generation/absorption effects are also examined. The electrically-conducting nature of the nanofluid invokes magnetohydrodynamic effects. The moving boundary value problem is normalized and linearized using the lubrication approach. Analytical solutions are derived for axial velocity, temperature and nanoparticle volume fraction. Validation is conducted with Maple numerical quadrature. Furthermore, the salient features of pumping and trapping phenomena discourse briefly. The observations demonstrate promising features of the solar magnetohydrodynamic peristaltic nanofluid pump which may also be exploited in spacecraft applications, biological smart drug delivery etc.

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Performance investigation on a thermal energy storage integrated solar collector system using nanofluid

Cited by 33 publications

References 15 publications

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

Optimal research of annular baffle for heat‐discharging performance of single thermal storage tank with molten salt

Peristaltic pumping of magnetic nanofluids with thermal radiation and temperature-dependent viscosity effects: Modelling a solar magneto-biomimetic nanopump

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