A Cone Concentrator for High-Temperature Solar Cavity-Receivers

Hahm, T.; Schmidt–Traub, H.; Leßmann, B.

doi:10.1016/s0038-092x(98)00119-4

Cited by 26 publications

(12 citation statements)

References 7 publications

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“…Hahm et al [23] compared the performance of a single cavity receiver with solar cavity receiver combined with a fabricated cone concentrator. They observed large amounts of heat rejection with smaller exit aperture size for the cone concentrator.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

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The numerical study and optimization of combined laminar natural convection and surface radiation heat transfer in solar cavity receiver with plate fins is presented in this paper. Minimizing heat loss in cavity receivers is seen as an effective way to enhance the thermal performance and the use of plate fins has been proposed as a low cost means to minimize heat loss. Firstly, the influence of operating temperature, emissivity of the surface, orientation and the geometric parameters on the total heat loss from the receiver was investigated. It was observed that convective heat loss is largely affected by the angle of inclination of the receiver, the presence of fins and the number of fins in the receiver. As for the radiation heat loss it was observed that it is mainly influenced by the properties of the cavity receiver surface. The radiation heat loss was found to be constant at all the angles of the receiver. Significant reduction in natural convection heat loss from the cavity receiver was accomplished by using the plate fins whereas radiation heat loss was marginally reduced by about 5%. Secondly, the optimization was conducted to obtain the optimal fin geometry and lastly, the overall thermal efficiency of the receiver was presented at different operating temperatures. The overall cavity efficiency marginally increased by approximately 2% with the insertion of fin plates although the convective heat loss was suppressed by about 20%. This is due to the fact that radiation heat loss dominates at high operating temperatures compared to convective heat loss.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

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“…Experiments are conducted for different fluid inlet temperatures, inclination angles and aperture sizes. Bairi, [11] developed a two dimensional numerical model applicable for parallelogram shaped cavity and analysation have been made for inclination angles, heat exchange between passive and active walls by using different correlations of Nusselt number.Hahm et al, [12] reported that in a cone cavity receiver, rejection of solar rays will be more if the aperture gap is too small, similarly, more losses from cavity will occurs if there is a larger aperture gap . Singh and Eames, (2011) explains about the convection mode of heat transfer in cavity depends on shape of the cavity, aspect ratio and given boundary condition of wall.…”

Section: Review Of Literaturementioning

confidence: 99%

Experimental and Artificial Neural Network (Ann) Simulation of a Solar Cavity Collector

B*,

et al. 2019

IJEAT

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Solar cavity collector (SCC) is an improvised version of flat plate solar collector (FPC). A SCC of outer radius 16mm positioned concentrically and placed in a 50 mm metal box. Five numbers of such cavities with a provision of inlet and outlet water pipes has been fabricated and experimented for its optimal performance. This experimental gadget is used to heat the water. As the physical dimensions of solar cavity collector influence the performances of the cavity collector, it includes the comparison of 5 numbers of cavities and 7 numbers of cavities, effect of aperture entry have been taken as investigation parameters in the present study. Inclination angle of the collector, water mass flow rates and mode of flow are the other parameters taken for the present study. Experimental data are trained and tested using Artificial Neural Network (ANN) tool of MATLAB software and ANN simulation results have been validated and verified with the available experimental data. Simulations for other set of variables have been predicted with the developed ANN mode

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“…At high solar flux concentration ratios (²1,000 suns), which are defined as the ratios of concentrated irradiation intensity versus the direct normal beam insolation (1 sun is equivalent to the normal beam insolation of 1 kW m ¹2 ), high temperatures exceeding 1,000°C are available. 4), 5) In addition to thermal stability, catalytic materials should have the ability to withstand corrosive chemical substances, for example, strong acids, in some processes. Thus, catalytic materials with high heat and/or corrosion resistance are essential in the fields of environmental protection and clean energy production.…”

Section: Introductionmentioning

confidence: 99%

Heat- and corrosion-resistant catalytic materials for environmental and energy applications

Machida

2021

J. Ceram. Soc. Japan

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A Cone Concentrator for High-Temperature Solar Cavity-Receivers

Cited by 26 publications

References 7 publications

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Experimental and Artificial Neural Network (Ann) Simulation of a Solar Cavity Collector

Heat- and corrosion-resistant catalytic materials for environmental and energy applications

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