A CFD-supported dynamic system-level model of a sodium-cooled billboard-type receiver for central tower CSP applications

Cagnoli, Mattia; Calle, Alberto de la; Pye, John; Savoldi, Laura; Zanino, Roberto

doi:10.1016/j.solener.2018.11.031

Cited by 25 publications

(8 citation statements)

References 19 publications

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“…Solar cavity receivers find frequent use in paraboloidal dish and central tower systems and can be subjected to large concentrations of solar flux. Efforts to increase the operating efficiency of this CST system component have included research on optimised receiver geometries (Asselineau, 2018;Pye et al, 2016;Shuai et al, 2008), utilising the natural variation of receiver surface temperature to reduce convection and radiation losses (Hughes et al, 2016), use of air curtains (Fang et al, 2019;Zhang et al, 2015), use of protective cowling as part of receiver structure (Cagnoli et al, 2019), use of partial or full windows on receiver aperture (Flesch, Robert et al, 2015;Maag et al, 2011;Uhlig et al, 2014), a variable aperture opening mechanism (Najafabadi et al, 2019;Van den Langenbergh et al, 2015), finned internal surfaces (Ngo et al, 2015) and cavity rotation (Wu, W. et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The geometric length scales encountered in CSP receivers renders both natural and forced convection effects important in design and performance analysis of these systems (Torres et al, 2018;Torres et al, 2020). Researchers have used laboratory-scale experiments or numerical models to examine how losses and receiver performance are affected by mixed convection (Cagnoli et al, 2019;Lee et al, 2018;Lee et al, 2017;Ma, 1993;Prakash et al, 2009;Siebers and Kraabel, 1984;Torres et al, 2018;Xiao et al, 2012). The observed trends vary depending on parameters such as receiver inclination, geometry and wind conditions (speed, direction, turbulence intensity).…”

Section: Introductionmentioning

confidence: 99%

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Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

et al. 2020

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“…Heat transfer was simulated and analyzed by Navier-Stokes equations, as results was possible to enhanced heat flux, associated to natural convective flow and system reduced around 30% the time needed to charge the heat storage. Furthermore, in [13] is presented a model which solves a heat transfer problem in receiver pipe conduction with a sodium internal flow. In the analysis was studied under different speeds of wind, also convective losses were calculated through empirical correlation based on literature and then evaluated by CFD study.…”

Section: Introductionmentioning

confidence: 99%

Parabolic Trough Collector with Internal Fractal Fins in Receiver to Increase Thermal Performance in Working Fluid

Palacios¹,

Amaya²,

Ramos³

2020

Preprint

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Concentrated solar power technologies have been studied in recent years as a potential solution for energy production industry , however this kind of systems face different challenges in order to increase thermal performance and efficiency. This paper presents the results of a thermal analysis on a parabolic trough collector with different receivers internal fins configurations, systems were studied in CFD Solidworks® flow simulation software and compared with a traditional parabolic collector with cylindrical receiver. Results shows that the lowest thermal performance was achieved with a cylindrical pipe, instead fractal fins receiver with 5 internal fins achieves a temperature increase of 27% and the best pipe configuration was fractal Descartes with 12 internal pipes which e the cylindrical temperature in 29%.

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“…The quantity of models that solve the receiver thermal behaviour is also abundant, they can be classified in detailed and simplified models. The first category is solved using CFD tools [22][23][24][25][26][27][28][29][30];…”

Section: Introductionmentioning

confidence: 99%

Field-receiver model validation against Solar Two tests

Rodríguez-Sánchez

Sánchez-González

2019

Renewable and Sustainable Energy Reviews

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Validation is a crucial aspect in the reliability assessment of models. Validation accuracy is measured with respect to experimental data. In this regard, there is not any experimental technique with sufficient spatial resolution capable of measuring the incident solar flux onto the receiver of solar power tower plants to model validation. Therefore, the individual optical efficiency of the field and the thermal performance of the receiver cannot be accurately obtained experimentally. To calculate these efficiencies, the development of numerical models is mandatory. Although, numerous receiver models can be found in the literature, the accuracy of most of them is not checked because of the scarcity of experimental data to compare with.In this study, the simulations of a model that includes the heliostat field and an external tubular receiver, taking into account all the receiver tubes, have been compared with available experimental data from Solar Two plant, in order to check its accuracy. It was obtained that the model overestimates 1.42% the total mass flow rate and 0.73% the global efficiency of Solar Two, which is almost negligible. Besides, the field-receiver efficiency can be calculated with confidence using Solar Two experimental data, and then it can be taken into account in the validation of the model. The model error, with respect to the experimental data are of 1.1% at full load and 1.4% at 50% partial load.

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A CFD-supported dynamic system-level model of a sodium-cooled billboard-type receiver for central tower CSP applications

Cited by 25 publications

References 19 publications

Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

Parabolic Trough Collector with Internal Fractal Fins in Receiver to Increase Thermal Performance in Working Fluid

Field-receiver model validation against Solar Two tests

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