Publication detail
Solar Absorber with a Structured Surface – a Way to Increase Efficiency
MRŇA, L. ŘIHÁČEK, J. HORNÍK, P. ŠARBORT, M.
English title
Solar Absorber with a Structured Surface – a Way to Increase Efficiency
Type
journal article in Web of Science
Language
en
Original abstract
The basic idea of solar absorber thermal gain increase is the keyhole effect utilization during which the radiation is absorbed by multiple reflections on cavity walls. The lattice of pyramidal or conical cavities on the solar absorber surface can be formed to create structured surface leading to its overall absorptivity increase and to the reduction of surface absorptivity dependence on the solar radiation incident beam angle changes caused by the daily and annual solar cycles. This contribution concludes the results of simulations of the effect of cavity geometry, geographical position and absorber orientation on its thermal gain with respect to the technological manufacturability of cavities. Furthermore, the real construction of the absorber with structured surface using laser welding and parallel hydroforming is briefly described.
English abstract
The basic idea of solar absorber thermal gain increase is the keyhole effect utilization during which the radiation is absorbed by multiple reflections on cavity walls. The lattice of pyramidal or conical cavities on the solar absorber surface can be formed to create structured surface leading to its overall absorptivity increase and to the reduction of surface absorptivity dependence on the solar radiation incident beam angle changes caused by the daily and annual solar cycles. This contribution concludes the results of simulations of the effect of cavity geometry, geographical position and absorber orientation on its thermal gain with respect to the technological manufacturability of cavities. Furthermore, the real construction of the absorber with structured surface using laser welding and parallel hydroforming is briefly described.
Keywords in English
solar absorber, hydroforming, multiple reflections, absorption efficiency, LS-DYNA
Released
30.04.2019
Publisher
Czech Technical University in Prague
Location
Praha
ISSN
1805-2363
Volume
59
Number
2
Pages from–to
134–143
Pages count
10
BIBTEX
@article{BUT156763,
author="Libor {Mrňa} and Jan {Řiháček} and Petr {Horník},
title="Solar Absorber with a Structured Surface – a Way to Increase Efficiency",
year="2019",
volume="59",
number="2",
month="April",
pages="134--143",
publisher="Czech Technical University in Prague",
address="Praha",
issn="1805-2363"
}