Enhanced heat transfer in a parabolic trough solar receiver by inserting rods and using molten salt as heat transfer fluid

Chang, Chun; Sciacovelli, Adriano; Wu, Zhiyong; Li, Xin; Li, Yongliang; Zhao, Mingzhi; Deng, Jie; Wang, Zhifeng; Ding, Yulong

doi:10.1016/j.apenergy.2018.03.091

Cited by 95 publications

(27 citation statements)

References 47 publications

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“…Thermal oils have been used in solar energy fields since the 1970s, due to their low cost, low thermal pressure, good thermal stability and long service life when the operating conditions recommended by the manufacturers are met [2]. Thermal oils have some limitations as they are not environmentally clean, have a high fire risk, the operating temperature should be below 400 ºC and in some cases they can cause degradation of the receiver vacuum due to the production of hydrogen [3] Parabolic trough collector (PTC), which works with molten salt technology, has attracted attention in recent years due to its high performance and low-cost aspects [4]. Some authors have shown that Levelized Costs of Electricity (LCOE) is reduced with higher operating temperatures, greater temperature differences, and direct change of the thermal oil system with the molten salt.…”

Section: Introductionmentioning

confidence: 99%

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Arslan

Günerhan

2019

E3S Web Conf.

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In this study energetic and exergetic performances of parabolic trough collector is theoretically investigated by using 120 l/min synthetic ‘’Dowtherm A’’ oil , 1200 l/min Air at 100 bar (10 MPa) and 150 l/min molten salt which is mixture of 60 wt% sodium nitrate (NaNO3) and 40 wt% potassium nitrate (KNO3) which are widely used as heat transfer fluids. Fluids performance comparisons were performed with the LS-2 module, which is used with vacuum in annulus and Cermet as a selective coating. LS-2 module has 7.8 m receiver length and is 39 m2 aperture area. As a result, the maximum exergy efficiency of the molten salt, synthetic oil, Air to be 41.19% at 422 °C, 40.82% at 400 °C, 40.33% at 402 °C, respectively. The maximum exergy of air is higher than other working fluids up to 310 ° C but after about 310 ° C the exergy of the molten salt is higher than the others. The molten salt has the best energy efficiency at its operating temperatures (250 °C to 550 °C) than other working fluids.

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Section: Introductionmentioning

confidence: 99%

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Arslan

Günerhan

2019

E3S Web Conf.

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“…Furthermore, the largest reduction in the entropy generation was about 58.8%. Chang et al investigated numerically a new type of inserts in which they used concentric and eccentric rod tabulators in different positions with molten salt as a base fluid. The normalized Nusselt number resulted from the simulations increased from 1.1 to 7.42 times with respect to the typical solar receiver.…”

Section: The Effect Of Inserting Swirl Generators On the Thermal Perfmentioning

confidence: 99%

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Abed

Afgan

2020

Int J Energy Res

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A wide range of engineering industrial applications require both the thermal and optical efficiencies of the system to be maximized with a reasonable low penalty for the friction factor and subsequently low losses in pressure. Among the family of concentrated solar power systems, parabolic trough collectors (PTCs), which have recently received significant attention, face similar challenges. The current work presents an extensive review of the PTC systems comparing recent and past technologies, which are widely being used to improve and enhance the thermal and optical efficiencies. Furthermore, the techniques used for single and two-phase flow modeling in numerical simulations, design variables, and experimental processes have been discussed in detail. The article also presents different numerical methods and analytical approaches of implementing the nonuniform solar distribution with different design parameters. Four main technologies are comprehensively addressed to effectively enhance the thermal performance of the PTCs; changing working heat transfer fluids, replacing the working fluids by nanofluids (single and hybrid) that have higher thermal-physical properties than those of base working fluids, inserting different tabulators with various design configurations, and finally combining the advantages of nanofluids and swirl generators in the same application. The article also critically summarizes the studies investigating the enhancement of thermal performance: use of novel design of PTCs and passive heat transfer enhancement techniques. Finally, a wide range of numerical and experimental studies are proposed for the future work related to the aforementioned main technologies. K E Y W O R D Sheat transfer enhancements, nanofluids, parabolic trough solar collectors, solar thermal energy, tabulators, thermal and optical performances

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“…As indicated in the results, three fins in the lower part can be considered as the optimal approach. A three‐dimensional model of a parabolic trough collector has been provided by Chang et al for improving the heat transfer in the system by utilizing molten salt as the working fluid and inserting rods. Patil et alpresented novel designs associated with parabolic trough collectors with smaller rim angles.…”

Section: Solar Thermal Power Generation Systems With Various Solar Comentioning

confidence: 99%

Solar power technology for electricity generation: A critical review

Ahmadi

Ghazvini

Sadeghzadeh

et al. 2018

Energy Science & Engineering

317

111

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Negative environmental impact of fossil fuel consumption highlight the role of renewable energy sources and give them a unique opportunity to grow and improve. Among renewable energy sources solar energy attract more attention and many studies have focused on using solar energy for electricity generation. Here, in this study, solar energy technologies are reviewed to find out the best option for electricity generation. Using solar energy to generate electricity can be done either directly and indirectly. In the direct method, PV modules are utilized to convert solar irradiation into electricity. In the indirect method, thermal energy is harnessed employing concentrated solar power (CSP) plants such as Linear Fresnel collectors and parabolic trough collectors. In this paper, solar thermal technologies including soar trough collectors, linear Fresnel collectors, central tower systems, and solar parabolic dishes are comprehensively reviewed and barriers and opportunities are discussed. In addition, a comparison is made between solar thermal power plants and PV power generation plants. Based on published studies, PV‐based systems are more suitable for small‐scale power generation. They are also capable of generating more electricity in a specific area in comparison with CSP‐based systems. However, based on economic considerations, CSP plants are better in economic return.

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Enhanced heat transfer in a parabolic trough solar receiver by inserting rods and using molten salt as heat transfer fluid

Cited by 95 publications

References 47 publications

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

Investigation of energetic and exergetic performances of parabolic trough collector with using different heat transfer fluids

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Solar power technology for electricity generation: A critical review

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