Comparative study of heat transfer enhancement using different fins in semi-circular absorber tube for large-aperture trough solar concentrator

Gong, Jing hu; Wang, Jun; Lund, Peter; Zhao, Dan; Xu, Jing; Jin, Yi hao

doi:10.1016/j.renene.2020.12.054

Cited by 29 publications

(5 citation statements)

References 45 publications

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“…A 2800 mm aperture width and length of 4000mm of the trough were selected for this study. The reflectivity of the Fibrefrax 140 coated with Al2O3 (reflector) is 96, as reported by Wang et al (2021). The transmittance of the glass cover obtained from the Solidworks flow simulation was 0.96.…”

Section: Fiberfrax 140 Coated With Al2o3 Reflectormentioning

confidence: 68%

“…Maximizing the overall performance of PTCs hinges on achieving efficient heat transfer within the receiver tube. Gong et al (2021) conducted a comparative study on heat transfer enhancement using different fins in a semi-circular absorber tube for large-aperture trough solar concentrators, the finding shows that the introduction of fins to an absorber tube can enhance its thermal efficiency, leading to improvements from 75.7% to 76.9% with short and thick fins and further to 77.3% with long and thin fins within a flow velocity range of 0.4-1.5 m/s. While the long and thin fins exhibit superior heat transfer enhancement, the overall heat transfer performance factor, which considers frictional losses, is higher for short and thick fins.…”

Section: Nomenclaturementioning

confidence: 99%

“…It is capable of withstanding high temperatures and can be used as a lining material for the interior surface of the parabolic trough reflector. (Wang et al, 2021). Table 1 represents the design parameters of the parabolic trough collector.…”

Section: Fiberfrax 140 Coated With Al2o3 Reflectormentioning

confidence: 99%

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Numerical Heat Transfer Enhancement of Solar Receiver Tube of Parabolic Trough Collector Using Fiberfrax 140 Coated With Al 2o 3

Isah,

Abioye,

Fachway

2024

Nigerian Journal of Tropical Engineering

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Parabolic trough collectors (PTCs) play a vital role in solar-thermal energy conversion, with the absorber tube being central to heat collection efficiency. This study investigates the potential for improving heat transfer within the PTC absorber tube using Fiberfrax 140 coated with Al 2O 3 as a novel reflector material. The research is driven by the ongoing pursuit of enhanced PTC performance. A standard modeling approach was employed, utilizing Computational Fluid Dynamics (CFD) analysis with SolidWorks Flow Simulation software, coupled with solar simulations to assess collector performance under varying conditions. Environmental parameters of Bauchi such as temperature, humidity, and wind speed were sourced from the Nigerian Meteorological Agency (NiMet). Optimization techniques were implemented to establish the optimal design configuration. The optimal design parameters were determined as a focal length of 700mm and a rim angle of 90°. Simulations were conducted daily from 8:00 AM to 5:00 PM, encompassing the period of January to June. A mass flow rate of 0.2 kg/s, informed by existing literature, was employed in the simulations. The results indicate improved collector performance throughout the simulated period, with peak thermal efficiency ranging from70%to82%.

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Section: Fiberfrax 140 Coated With Al2o3 Reflectormentioning

confidence: 68%

Section: Nomenclaturementioning

confidence: 99%

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Numerical Heat Transfer Enhancement of Solar Receiver Tube of Parabolic Trough Collector Using Fiberfrax 140 Coated With Al 2o 3

Isah,

Abioye,

Fachway

2024

Nigerian Journal of Tropical Engineering

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“…A pin fin, a ring fin, and a straight fin with constant and variable areas can be mentioned as types of fins. (Borhani et al 2019 , Gong et al 2021 , Izadi et al 2023c , Saedodin et al 2023 ).…”

Section: Methods Of Improving Heat Transfer In Fpscsmentioning

confidence: 98%

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Zaboli,

Saedodin,

Ajarostaghi

et al. 2023

Environ Sci Pollut Res

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This paper reviews the impacts of employing inserts, nanofluids, and their combinations on the thermal performance of flat plate solar collectors. The present work outlines the new studies on this specific kind of solar collector. In particular, the influential factors upon operation of flat plate solar collectors with nanofluids are investigated. These include the type of nanoparticle, kind of base fluid, volume fraction of nanoparticles, and thermal efficiency. According to the reports, most of the employed nanofluids in the flat plate solar collectors include Al2O3, CuO, and TiO2. Moreover, 62.34%, 16.88%, and 11.26% of the utilized nanofluids have volume fractions between 0 and 0.5%, 0.5 and 1%, and 1 and 2%, respectively. The twisted tape is the most widely employed of various inserts, with a share of about one-third. Furthermore, the highest achieved flat plate solar collectors’ thermal efficiency with turbulator is about 86.5%. The review is closed with a discussion about the recent analyses on the simultaneous use of nanofluids and various inserts in flat plate solar collectors. According to the review of works containing nanofluid and turbulator, it has been determined that the maximum efficiency of about 84.85% can be obtained from a flat plate solar collector. It has also been observed that very few works have been done on the combination of two methods of employing nanofluid and turbulator in the flat plate solar collector, and more detailed work can still be done, using more diverse nanofluids (both single and hybrid types) and turbulators with more efficient geometries.

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“…The secondary reflector is used to reflect the sun rays to enhance the factor of interception when a large aperture is used with a small absorber tube [ 37 ]. Additionally, the third method is changing the absorber’s shape; hence, by adding a secondary reflector, the study made by Gong et al [ 38 ] displayed an optical efficiency of less than 75%. Therefore, a semicircular receiver tube with a solar radiation flux distribution is used on the circular receiver tube model to intercept more sun rays.…”

Section: Introductionmentioning

confidence: 99%

Thermal–Optical Evaluation of an Optimized Trough Solar Concentrator for an Advanced Solar-Tracking Application Using Shape Memory Alloy

et al. 2022

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One of the modern methods for enhancing the efficiency of photovoltaic (PV) systems is implementing a solar tracking mechanism in order to redirect PV modules toward the sun throughout the day. However, the use of solar trackers increases the system’s electrical consumption, hindering its net generated energy. In this study, a novel self-tracking solar-driven PV system is proposed. The smart solar-driven thermomechanical actuator takes advantage of a solar heat collector (SHC) device, in the form of a parabolic trough solar concentrator (PTC), and smart shape memory alloy (SMA) to produce effective mechanical energy for solar tracking applications from sun rays. Furthermore, a thermal–optical analysis is presented to evaluate the performance of the solar concentrator for the simulated weather condition of Dammam City, Saudi Arabia. The numerical results of the thermal and optical analyses show the promising feasibility of the proposed system in which SMA springs with an activation temperature between 31.09 °C and 45.15 °C can be utilized for the self-tracking operations. The work presented adds to the body of knowledge an advanced SMA-based SHC device for solar-based self-actuation systems, which enables further expansions within modern and advanced solar thermal applications.

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Comparative study of heat transfer enhancement using different fins in semi-circular absorber tube for large-aperture trough solar concentrator

Cited by 29 publications

References 45 publications

Numerical Heat Transfer Enhancement of Solar Receiver Tube of Parabolic Trough Collector Using Fiberfrax 140 Coated With Al 2o 3

Numerical Heat Transfer Enhancement of Solar Receiver Tube of Parabolic Trough Collector Using Fiberfrax 140 Coated With Al 2o 3

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Thermal–Optical Evaluation of an Optimized Trough Solar Concentrator for an Advanced Solar-Tracking Application Using Shape Memory Alloy

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