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Communication Dans Un Congrès Année : 2017

Optical performance analysis of a porous open volumetric air receiver in a solar power tower

Résumé

A comprehensive optical model for a solar power tower with an open volumetric air receiver (OVAR) was developed and validated in this work. Based on the model, the optical characteristics of the OVAR were studied. Firstly, the detailed distributions of the non-uniform solar flux (q sr) on the aperture and the solar source (S sr) in the OVAR were studied. The incident flux was found to be relatively uniform across the aperture for a single OVAR. However the incident angle of the rays varies between 0° and 42° , which indicates that the parallel assumption of the rays is not appropriate at this condition. Furthermore, the S sr in the absorber decreases from the inlet to the outlet, and the maximum source (S sr,max) of 2.414×10 8 W· m-3 appears at the inlet. Moreover, the S sr,max was found to appear at the region near the wall rather than the center of the receiver as usual for the combined effect of the non-parallel incident rays and the diffuse reflection on the wall. The revelation of this phenomenon could offer help to the heat transfer analysis and safe operation of the OVAR. In addition, study on the effects of the porous parameters indicates that the solid emissivity influences both the S sr distribution and the receiver efficiency significantly. However, the pore diameter and the porosity influence S sr distribution importantly, but have negligible effect on the efficiency. Finally, the optical efficiency of 86.70%, reflection loss of 13.20% and transmission loss of 0.10% were found to be achieved by the OVAR.
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Dates et versions

hal-01344363 , version 1 (11-07-2016)
hal-01344363 , version 2 (01-11-2016)
hal-01344363 , version 3 (10-04-2017)

Identifiants

  • HAL Id : hal-01344363 , version 2

Citer

Yu Qiu, Ming-Jia Li, Ya-Ling He, Ze-Dong Cheng. Optical performance analysis of a porous open volumetric air receiver in a solar power tower. Proceedings of the 2nd Thermal and Fluid Engineering Conference(TFEC2017) and 4th International Workshop on Heat Transfer(IWHT2017), Apr 2017, Las Vegas, United States. ⟨hal-01344363v2⟩
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