A cavity-receiver containing a tubular absorber for high-temperature thermochemical processing using concentrated solar energy

Melchior, Tom; Perkins, Christopher; Weimer, Alan W.; Steinfeld, Aldo

doi:10.1016/j.ijthermalsci.2007.12.003

Cited by 104 publications

(38 citation statements)

References 23 publications

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“…In dilute fluidised systems, non-radiative energy transfer may be represented quite simply by a single energy equation when the particles are small and dilute enough to take on the local temperature of the surrounding fluid. This assumption allows a single-temperature heat equation to be solved with effective properties and a source term due to enthalpy of reaction as used in the works of Haussener et al (2009) and Melchior et al (2008Melchior et al ( , 2009). …”

Section: Energy Transfermentioning

confidence: 99%

Modelling of solar thermochemical reaction systems

et al. 2017

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a b s t r a c tThis article reviews the progress, challenges and opportunities in numerical modelling of thermal transport, thermochemical reactions and thermomechanics in high-temperature solar thermochemical systems. Continuum-scale models are presented in mathematical detail while highlighting the literature that uses them. The discussion is enhanced by selected examples of numerical studies of solar thermochemical systems for solar fuels and commodity material production. Property predictions necessary for the modelling of solar thermochemical reaction systems are covered.

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Section: Energy Transfermentioning

confidence: 99%

Modelling of solar thermochemical reaction systems

et al. 2017

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“…The indirectly irradiated entrained-flow solar reactor, Fig. 12(c), was modeled using MC and radiosity methods to determine the radiation distribution within the cavity, which in turn was coupled to 2D conductive heat transfer through the reactor tube that drove convective and radiative heat transfer to the entrained reactive flow of shrinking particles [97,98].…”

Section: Heat and Mass Transfer Modeling Of Solar Thermochemical Systemsmentioning

confidence: 99%

Review of Heat Transfer Research for Solar Thermochemical Applications

Lipiński¹,

Davidson

Haussener

et al. 2013

Journal of Thermal Science and Engineering Applications

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This article reviews the progress, challenges and opportunities in heat transfer research as applied to high-temperature thermochemical systems that use high-flux solar irradiation as the source of process heat. Selected pertinent areas such as radiative spectroscopy and tomography-based heat and mass characterization of heterogeneous media, kinetics of high-temperature heterogeneous reactions, heat and mass transfer modeling of solar thermochemical systems, and thermal measurements in high-temperature systems are presented, with brief discussions of their methods and example results from selected applications.

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“…The solar receiver is a key component in these applications converting solar energy efficiently into thermal energy. Numerical models offer an effective pathway for the characterization and quantification of the optical, thermal, and fluid flow behavior of receivers [12][13][14][15][16][17][18]. When steam is used as the working fluid (CSP application) or as the reactant in high-temperature systems (STEP and SHTE applications), the understanding of the complex two-phase flow boiling process inside the absorber tubes of the direct steam generation receiver is important for identifying local hot spots, and designing and predicting receiver performance.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design guidelines for direct steam generation solar receivers

et al. 2018

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• A computational model for solar receiver for direct steam generation is developed.• Experiments are conducted and used to validate the model.• Practical designs, operational conditions and material choices are investigated.• Model provides design tool for direct steam generation solar cavity receivers. A R T I C L E I N F OKeyword: Solar energy Multi-mode heat transfer modeling Two-phase flow modeling Solar receiver Steam generator Concentrated solar A B S T R A C T Concentrated solar energy is an ideal energy source for high-temperature energy conversion processes such as concentrated solar power generation, solar thermochemical fuel production, and solar driven high-temperature electrolysis. Indirectly irradiated solar receiver designs utilizing tubular absorbers enclosed by a cavity are possible candidates for direct steam generation, allowing for design flexibility and high efficiency. We developed a coupled heat and mass transfer model of cavity receivers with tubular absorbers to guide the design of solardriven direct steam generation. The numerical model consisted of a detailed 1D two-phase flow model of the absorber tubes coupled to a 3D heat transfer model of the cavity receiver. The absorber tube model simulated the flow boiling phenomena inside the tubes by solving 1D continuity, momentum, and energy conservation equations based on a control volume formulation. The Thome-El Hajal flow pattern maps were used to predict liquid-gas distributions in the tubular cross-sections, and heat transfer coefficients and pressure drop along the tubes. The heat transfer coefficient and fluid temperature of the absorber tubes' inner surfaces were then extrapolated to the circumferential of the tube and used in the 3D cavity receiver model. The 3D steady state model of the cavity receiver coupled radiative, convective, and conductive heat transfer. The complete model was validated with experimental data and used to analyze different receiver types and designs made of different materials and exposed to various operational conditions. The proposed numerical model and the obtained results provide an engineering design tool for cavity receivers with tubular absorbers (in terms of tube shapes, tube diameter, and water-cooled front), support the choice of best-performant operation (in terms of radiative flux, mass flow rate, and pressure), and aid in the choice of the component materials. The model allows for an indepth understanding of the coupled heat and mass transfer in the solar receiver for direct steam generation and can be exploited to quantify the optimization potential of such solar receivers.

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A cavity-receiver containing a tubular absorber for high-temperature thermochemical processing using concentrated solar energy

Cited by 104 publications

References 23 publications

Modelling of solar thermochemical reaction systems

Modelling of solar thermochemical reaction systems

Review of Heat Transfer Research for Solar Thermochemical Applications

Modeling and design guidelines for direct steam generation solar receivers

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