Experimental and numerical investigations on the thermal performance of a modified evacuated tube solar collector: Effect of the bypass tube

Jowzi, Mohammad; Veysi, Farzad; Sadeghi, Gholamabbas

doi:10.1016/j.solener.2019.03.063

Cited by 53 publications

(10 citation statements)

References 28 publications

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“…In detail, nanoparticles are homogenously dispersed into the base uid. The formulations related to the nano uid modeling that are applied in this problem are described by the following equations [32]: Density: (7) Heat capacity: (8) Viscosity: (9) Thermal conductivity: (10) Thermal expansion coe cient: (11) The thermophysical characteristics of CuO nanoparticles were calculated using the above equations, as shown in Table 3. The heat transfer coe cient is obtained to estimate the thermal performance of the system, which is de ned as: (12) Turning to the focus of this study, entropy generation analysis has been carried out in order to assess the functionality of the proposed system.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…Proving the accuracy of the results is an important part of a numerical simulation. Because of this, the experimental and the numerical study conducted by Jowzi et al [31] has been selected to verify the simulation in the present model. As it is depicted in Table 2, the obtained values for the tank's mean temperature over 1 hour of simulation are in good concordance with the numerical and empirical results, with an error of less than 3% in both studies, which shows the authenticity of the current results.…”

Section: Validation and Time Step Independencementioning

confidence: 99%

“…There is a vacuum envelope between the glass tube and absorber, leading to minimization of the heat loss originating from radiation and convection heat transfer [6]. Moreover, the absorbed heat is transferred to the working uid inside the absorber tube by use of various heat extraction methods [7]. ETSCs are assorted into three types in terms of heat extraction techniques: heat-pipe ETSC, U-pipe ETSC, and water-in-glass ETSC [8].…”

Section: Introductionmentioning

confidence: 99%

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Entropy Generation and Thermal Analysis of Nanofluid Flow Inside the Evacuated Tube Solar Collector

Tabarhoseini

Sheikholeslami

2021

Preprint

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In the current investigation, the thermal and thermodynamic behavior of a buoyancy-driven evacuated tube solar collector has undergone precise evaluation, and the efficacy of nanoparticle dispersion in the base fluid has been scrutinized using computational fluid dynamics based on the finite volume method. The natural convection process was analyzed in different vertical sections of the absorber tube. The temperature and velocity distributions of water as the conventional working fluid and the nanofluid were compared at various cutting planes along the tube during the simulation time. In this problem, CuO nanoparticles with optimum thermal properties were suspended in the base fluid. According to the surveyed results, the temperature distribution analysis illustrates that the mean temperature of the tank experiences more enhancement when the nanofluid is used. The comparison of the heat transfer coefficient between two simulated cases shows the competency of utilizing CuO/water nanofluid in the thermal performance improvement of the collector. The results related to entropy generation assessment show that the irreversibility owing to fluid friction rises when the nanofluid is applied during the flow time. In contrast, the entropy generation of pure water owing to heat transfer surpasses the case with nanofluid.

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Section: Mathematical Modellingmentioning

confidence: 99%

Section: Validation and Time Step Independencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Entropy Generation and Thermal Analysis of Nanofluid Flow Inside the Evacuated Tube Solar Collector

Tabarhoseini

Sheikholeslami

2021

Preprint

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“…This energy can be provided either electrically or by use of the solar energy. In order to avoid emission of the greenhouse gases such as carbon dioxide, utilizing the solar energy is by far preferable [7][8][9]. Solar stills (SSs) are reassuring candidates at this point, which are comprised of a sloped glass cover, a basin to hold the brine, insulated side walls, and a frame.…”

Section: Introductionmentioning

confidence: 99%

Retrofitting a thermoelectric-based solar still integrated with an evacuated tube collector utilizing an antibacterial-magnetic hybrid nanofluid

Sadeghi

Nazari

2021

Desalination

Self Cite

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“…Resources of natural energy such as hydropower, solar energy, and wind energy are available for human whole time. Solar energy is used to supply hot water for domestic, and industrial applications [2]. Flat Plate Solar Collectors (FPSCs) is considered a simple device and used widely as space heating, domestic application, and industrial application.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation to Asses and Optimize Performance of Flat Plate Solar Collector by Using Different Working Fluid

Abdula

Salim

Salman

2021

ARFMTS

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Sustainable energy becomes an optimal alternative to overcome environmental pollution economical cost of fossil fuel. One of the most effective means to invest solar radiation is flat plate solar collectors. A study carried out to optimize and assess the performance of flat plate solar collector (FPSC) for domestic and industrial applications in the Iraq climate. A 3D numerical model of FPSC has modeled by ANSYS19, CFD tool has been used to investigate thermal transfer through FPSC based on different working fluid. Water, and nanofluid of water/copper nanomaterials were used as working fluid with three different concentrations levels, 0.011 %, 0.055%, and 0,101 %. The velocity of water was 0.3, and 0.5 m/sec respectively. The result of the numerical model was compared with a literature study to prove the reliability of the current model. The result of the current study indicated that, adding Cu nanoparticular to the working fluid enhanced temperatures outlet of FPSC. Also, maximum temperatures can be achieved by reducing the velocity value.

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Experimental and numerical investigations on the thermal performance of a modified evacuated tube solar collector: Effect of the bypass tube

Cited by 53 publications

References 28 publications

Entropy Generation and Thermal Analysis of Nanofluid Flow Inside the Evacuated Tube Solar Collector

Entropy Generation and Thermal Analysis of Nanofluid Flow Inside the Evacuated Tube Solar Collector

Retrofitting a thermoelectric-based solar still integrated with an evacuated tube collector utilizing an antibacterial-magnetic hybrid nanofluid

Numerical Investigation to Asses and Optimize Performance of Flat Plate Solar Collector by Using Different Working Fluid

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