Thermal efficiency of a flat-plate solar collector filled with Pentaethylene Glycol-Treated Graphene Nanoplatelets: An experimental analysis

Alawi, Omer A.; Kamar, Haslinda Mohamed; Mallah, Abdul Rahman; Kazi, S. N.; Sidik, Nor Azwadi Che

doi:10.1016/j.solener.2019.09.011

Cited by 48 publications

(18 citation statements)

References 29 publications

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“…Firstly, the theoretical model was verified using experiments with DW [23] and an average error of ±3.53% was obtained (see Figure 1). The analytical approach (theoretical analyses) involved utilizing different base fluids containing f-GNPs for comparative analysis.…”

Section: Methodsmentioning

confidence: 88%

“…Akram et al [22] determined the improvement in the thermal performance of an FPSC to be 78% at a weight percent of 0.1 wt % CGNPs and a mass flow rate of 0.0260 kg s −1 . Alawi et al [23] analyzed the thermo-performance of FPSCs with GNPs as HTFs and reported that relative to the DW, the efficiency of the FPSCs increased by 10.7%, 11.1%, and 13.3% for the PEG-GNPs nanofluid in the case of multiple mass flow rates. In the case of metal oxides, GNPs, and SWCNTs nanofluids, the efficiency was directly proportional to the fraction of NPs, as the improved thermal properties mitigated hydrodynamic losses caused by high viscosity laminar flows [24].…”

Section: Introductionmentioning

confidence: 99%

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Graphene Nanoplatelets Suspended in Different Basefluids Based Solar Collector: An Experimental and Analytical Study

et al. 2021

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A flat plate solar collector (FPSC) was analytically studied, with functionalized graphene nanoplatelets (f-GNPs) as its working fluid. Four samples (wt % nanofluids) were prepared in different base fluids such as ethylene glycol (EG), distilled water (DW):EG (70:30), and DW:EG (50:50). Experimental results (via DW) were used to verify the effectiveness of the analytical model. Some of the operating conditions were taken into account in this research, including temperatures, power, and mass flow rates. Experimental techniques were used to elucidate the modified nanofluids’ physicochemical properties, such as its particle sizes, stability, and morphology, involving electron microscopes (EMs), UV–VIS, and X-ray techniques. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were applied to test the thermal analysis. The findings confirmed that the use of f-GNPs nanofluids enhanced the performance of the FPSC relative to the use of base fluids for all testing conditions. The maximum enhancement of the collector’s effectiveness at a mass flow rate of 1.5 kg min−1 and a weight concentration of 0.1 wt %, increased to 12.69%, 12.60%, and 12.62% in the case of EG, DW:EG (70:30), and DW:EG (50:50), respectively. The results also confirmed an improvement in both the heat gain (FR(τα)) and heat loss (FRUL) coefficients for the f-GNPs nanofluid.

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Section: Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Graphene Nanoplatelets Suspended in Different Basefluids Based Solar Collector: An Experimental and Analytical Study

et al. 2021

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“…In present numerical research, the MPCS was simplified to one single-phase thermal energy transfer medium, and the improvement of thermal energy transfer effect by the micro-convection was equivalent to the enhancement of thermal conductivity. Equation (15) shows the formula to calculate effective thermal conductivity of MPCS 30 : where ω stands for the volume coefficient of the MPCS, e represents the shear rate, d p stands for the diameter of the MPCM, and α f represents the thermal diffusivity. Thermal energy absorbed by the MPCS is calculated as follows:…”

Section: Thermophysical Properties Of Mpcsmentioning

confidence: 99%

Thermal performances evaluation of a flat‐plate solar collector using microencapsulated phase‐change slurry as heat transfer medium

Ran

Zhang

et al. 2022

Intl J of Energy Research

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Microencapsulated phase-change slurry (MPCS) is composed of microencapsulation phase-change materials (MPCM) and carrying medium (water), which can be used for heat transfer and thermal energy storage. Some theoretical and experimental works have been proposed on the thermal energy storage and flow performance of MPCS. However, there are few studies on the performances of MPCS in the thermal energy devices (eg, solar collector). In present work, the numerical model of a flat-plate solar collector with MPCS as the thermal energy storage fluid was established. Then, the effects of mass fraction of MPCS, latent heat and solar radiation on thermal efficiency, and pumping power consumption of the solar collector model were studied. The simulations indicated that the thermal efficiency of the solar collector model was positively correlated with the mass fraction and latent heat, but decreased with the increase of solar radiation. When the inlet flow rate, mass concentration, latent heat and solar radiation of the MPCS were set to 0.01 m/s, 5.90%, 88 kJ/kg and 300 W/m 2 , respectively, thermal efficiency of the solar collector model was the largest, which was 0.711. Moreover, the pumping power consumption was mainly affected by inlet flow rate and mass fraction of MPCS.

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“…The improvement of collector efficiency was estimated based on ISO 9806:2017 standard [55], where the highest instantaneous efficiency obtained was 48.67 % and 36.20 % for the NF and pure water fluid, respectively. Alawi et al [56] experimentally investigated the thermal performance of FPSC using Pentaethylene Glycol treated Graphene nanoplatelets (GNPs)/water as a working fluid at 0.025, 0.05, 0.075, and 0.1 % concentrations. The experiment set with 303, 313, and 323 K collector inlet temperatures and 0.00833, 0.01667, and 0.025 kg/s mass flow rates was exposed to 500, 750, and 1000 W/m 2 heat flux intensities.…”

Section: Application Of Nfs To Enhance Performance Of Fpscsmentioning

confidence: 99%

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

Al-Yasiri

Szabó

Arıcı

2020

Period. Polytech. Mech. Eng.

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Solar energy represents the best alternative for traditional energy sources used in many thermal energy systems. Among solar thermal systems, Flat Plate Solar Collectors (FPSCs) are the most utilized type implemented in low and medium-level thermal domestic applications. Recently, the usage of nanofluids (NFs) to enhance FPSCs is one of the newest technologies that has drawn the attention of researchers to improve the overall thermal efficiency of solar systems. This paper briefly reviews the recent studies carried on thermal performance enhancement of FPSCs by implementing NFs (single and hybrid NFs) considering the main influential parameters such as particle concentration, particle size, and collector area. Finally, the main obstacles reported by the researchers such as the instability, viscosity, concentration limit, corrosion effect and others are identified, which is believed to be useful for interested newcomers in this research area. Based on the studies investigated in this paper, NFs, even under low concentrations, can remarkably improve the energetic and exergetic efficiency of FPSCs.

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Thermal efficiency of a flat-plate solar collector filled with Pentaethylene Glycol-Treated Graphene Nanoplatelets: An experimental analysis

Cited by 48 publications

References 29 publications

Graphene Nanoplatelets Suspended in Different Basefluids Based Solar Collector: An Experimental and Analytical Study

Graphene Nanoplatelets Suspended in Different Basefluids Based Solar Collector: An Experimental and Analytical Study

Thermal performances evaluation of a flat‐plate solar collector using microencapsulated phase‐change slurry as heat transfer medium

Single and Hybrid Nanofluids to Enhance Performance of Flat Plate Solar Collectors: Application and Obstacles

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