Evaluation of finite volume solutions for radiative heat transfer in a closed cavity solar receiver for high temperature solar thermal processes

Martinek, Janna; Weimer, Alan W.

doi:10.1016/j.ijheatmasstransfer.2012.11.065

Cited by 24 publications

(31 citation statements)

References 35 publications

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“…Studies employing the MC method include (Ebner and Lipiń ski, 2011;Jäger et al, 2009;Lapp et al, 2013;Lipiń ski et al, 2006;Martinek and Weimer, 2013a;Zedtwitz et al, 2007;Zedtwitz and Steinfeld, 2005;Z'Graggen and Steinfeld, 2009;. The finite volume method has been analysed for its applicability in STRS simulation in (Martinek and Weimer, 2013b). It was found that a hybrid MC/FV approach, that took the accuracy of the MC method with the easy compatibility of the FV with CFD solvers, was an ''optimal" approach.…”

Section: Radiative 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: Radiative Energy Transfermentioning

confidence: 99%

Modelling of solar thermochemical reaction systems

et al. 2017

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“…Nevertheless, the DO method has two major shortcomings due to its FV nature, namely the "ray effect" and "false scattering", which affect result accuracy (Brunner, 2002;Chai and Patankar, 2006). The former is also known as "ray concentration" (Martinek and Weimer, 2013), and the latter as "numerical scattering" (Li, 2004), "numerical smearing" (Jessee and Fiveland, 1997) or "false diffusion" in CFD communities (Hachicha, 2013). Before using DO as a ray-tracing method in a solar field, the ability of reducing these shortcoming effects must be checked.…”

Section: Overcoming Do Shortcomings In Ray Tracingmentioning

confidence: 99%

“…As shown in Figure 2 above, Hachicha (2013) and later in Figure 11 for a much more complicated 2-D geometry, when a planar 2-D domain is considered, only three angular increments are required for the second ordinate direction. This means that the 25*25 increments used by Martinek and Weimer (2013) were unnecessary and resulted in a computational cost of 4*25*25 versus 4*3*25, an increase by a factor of more than 8. However, the studies of both Hachicha (2013) and Martinek and Weimer (2013) are good examples of the applicability of the DO solution using FV for solar applications.…”

Section: Test Case For Oblique Collimated Radiationmentioning

confidence: 99%

“…This means that the 25*25 increments used by Martinek and Weimer (2013) were unnecessary and resulted in a computational cost of 4*25*25 versus 4*3*25, an increase by a factor of more than 8. However, the studies of both Hachicha (2013) and Martinek and Weimer (2013) are good examples of the applicability of the DO solution using FV for solar applications. Both compared results with the Monte Carlo solution.…”

Section: Test Case For Oblique Collimated Radiationmentioning

confidence: 99%

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A novel computational approach to combine the optical and thermal modelling of Linear Fresnel Collectors using the finite volume method

2015

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A computational approach is presented, which uses the finite volume (FV) method in the Computational Fluid Dynamics (CFD) solver ANSYS Fluent to conduct the ray tracing required to quantify the optical performance of a line concentration Concentrated Solar Power (CSP) receiver, as well as the conjugate heat transfer modelling required to estimate the thermal efficiency of such a receiver. A Linear Fresnel Collector (LFC) implementation is used to illustrate the approach. It is shown that the Discrete Ordinates method can provide an accurate solution to the Radiative Transfer Equation (RTE) if the shortcomings of its solution are resolved appropriately in the FV CFD solver. The shortcomings are due to false scattering and the socalled ray effect inherent in the FV solution. The approach is first evaluated for a 2-D test case involving oblique collimated radiation and then for a more complex 2-D LFC optical domain based on the FRESDEMO project. For the latter, results are compared with and validated against those obtained with the Monte Carlo ray tracer, SolTrace. The outcome of the FV ray tracing in the LFC optical domain is mapped as a non-uniform heat flux distribution in the 3-D cavity receiver domain and this distribution is included in the FV conjugate heat transfer CFD model as a volumetric source. The result of this latter model is the determination of the heat transferred to the heat transfer fluid running in the collector tubes, thereby providing an estimation of the overall thermal efficiency. To evaluate the effectiveness of the phased approach in terms of accuracy and computational cost, the novel 2-D:3-D phased approach is compared with results of a fully integrated, but expensive 3-D optical and thermal model. It is shown that the less expensive model provides similar results and hence a large cost saving. The novel approach also provides the benefit of working in one simulation environment, i.e. ANSYS Workbench, where optimisation studies can be carried out to maximise the performance of linear CSP reflector layout and receiver configurations.

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“…A major part of the research into the use of concentrated solar radiation at very high temperatures has been motivated by the desire to generate high energy density thermochemical energy storage systems, see e.g. Diver et al (1992), Kodama (2003), Wieckert et al (2007), Neises et al (2012), Martinek & Weimer (2013), Tescari et al 2013), and the solar upgrading of carbonaceous materials (Zgraggen et al 2007), (Rodat et al 2010) and (Piatkowski et al 2011). These reaction schemes usually involve solar heating of combinations of gaseous and solid reactants to generate gaseous and solid products such as the two step water and CO2 splitting reactions involving intermediate metal oxides to generate hydrogen and/or synthesis gas (Steinfeld 2005), (Meier et al 2012), (Villasmil et al 2014) and (Neises et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Use of concentrated radiation for solar powered glass melting experiments

2014

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To investigate the feasibility of using concentrated solar radiation to provide process heat for glass production, a high flux solar simulator was used to melt glass forming batches. Initial experiments involved melting various glass forming batches which demonstrated that rapid and full conversion of the crystalline raw materials into an x-ray amorphous vitreous state was possible. A pure silica batch produced an x-ray amorphous product but it was not possible to refine the melt in these exploratory tests. A powdered, ternary soda-lime-silica (SLS) glass forming batch melted vigorously, with rapid gas removal, resulting in a completely transparent glass. Industrial SLS pellets were subsequently used in semi-continuous melting experiments, whereby the batch was intermittently fed into the melting zone while the beam was kept on. Additional secondary heating and insulation around outlet of the melting zone was required to achieve a semi-continuous flow of molten glass to an output crucible.

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Evaluation of finite volume solutions for radiative heat transfer in a closed cavity solar receiver for high temperature solar thermal processes

Cited by 24 publications

References 35 publications

Modelling of solar thermochemical reaction systems

Modelling of solar thermochemical reaction systems

A novel computational approach to combine the optical and thermal modelling of Linear Fresnel Collectors using the finite volume method

Use of concentrated radiation for solar powered glass melting experiments

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