Publication detail

Solar Absorber with a Structured Surface – a Way to Increase Efficiency

MRŇA, L. ŘIHÁČEK, J. HORNÍK, P. ŠARBORT, M.

Original Title

Solar Absorber with a Structured Surface – a Way to Increase Efficiency

Type

journal article in Web of Science

Language

English

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.

Keywords

solar absorber, hydroforming, multiple reflections, absorption efficiency, LS-DYNA

Authors

MRŇA, L.; ŘIHÁČEK, J.; HORNÍK, P.; ŠARBORT, M.

Released

30. 4. 2019

Publisher

Czech Technical University in Prague

Location

Praha

ISBN

1805-2363

Periodical

Acta Polytechnica (on-line)

Year of study

59

Number

2

State

Czech Republic

Pages from

134

Pages to

143

Pages count

10

URL

https://ojs.cvut.cz/ojs/index.php/ap/article/view/5191

BibTex

@article{BUT156763,
  author="MRŇA, L. and ŘIHÁČEK, J. and HORNÍK, P. and ŠARBORT, M.",
  title="Solar Absorber with a Structured Surface – a Way to Increase Efficiency",
  journal="Acta Polytechnica (on-line)",
  year="2019",
  volume="59",
  number="2",
  pages="134--143",
  doi="10.14311/AP.2019.59.0134",
  issn="1805-2363",
  url="https://ojs.cvut.cz/ojs/index.php/ap/article/view/5191"
}