Quantifying the shading effects of a small-scale rooftop-installed linear fresnel reflector in cyprus




HIGHLIGHTS
  • What: In order not to overload the main body of the present paper, height configurations of 1.5 m, 2.5 m, and 3.5 m are presented in Appendix B. This study shall be completed with a transient thermal analysis to validate the work conducted in this paper in a purely optical environment, as discussed in the previous section.
  • Who: Alaric Christian Montenon et al. from the (UNIVERSITY) have published the research work: Quantifying the Shading Effects of a Small-Scale Rooftop-Installed Linear Fresnel Reflector in Cyprus, in the Journal: Energies 2024, 17, 3269. of /2024/
  • How: The work was conducted using the Tonatiuh++ ray-tracing software to determine the annual radiation blocking.
SUMMARY

    The structure of a collector itself is a radiation blocker that has an indirect effect on the ground or on the roof where it is installed. This may lead to the attenuation of heating by solar radiation in the summer, but also the loss of the heating benefit granted by solar rays in the winter. No collector 4.0 metres 3.5 metres 3 metres 2.5 metres 2 metres 1.5 metres In summer, the radiation blocked increases as the installation height decreases, i.e., from 456 kWh · m-2 ‘as installed` to 119 kWh · m-2 at 4 m. In the current configuration, ‘as installed`, more than half of the radiation (53%) is beneficially blocked in summer, while the same ratio is blocked in winter. Still, this can be mitigated by establishing a horizontal stow position of the rows to block the radiation in the winter and a vertical position in the summer to increase the view factor towards the sky vault. As Installed 1.5 metres 2 metres 2.5 metres 3 metres 3.5 metres 4 metres As Installed Summer Radiation Blocked (kWh · m-2 ) Ratio Radiation Blocked Winter Radiation Blocked (kWh · m-2 ) Ratio Radiation Blocked Difference Summer vs. Winter (kWh · m-2 ) 0.6 Heat avoided in summer Heat lost in winter Ratio Ratio Installation height (m) Considering activation of cooling at 27 °C and heating at 18 °C, the blocking effect decreases with increasing height of installation, while after 4 m of height, the effect is almost null. Heights in between present a blocking benefit in summer, offsetting the valuable radiation lost in winter by a factor of 7 to 9. @@

LAY DEFINITIONS
  • radiation: Emission or propagation of acoustic waves (SOUND), ELECTROMAGNETIC ENERGY waves (such as LIGHT; RADIO WAVES; GAMMA RAYS; or X-RAYS), or a stream of subatomic particles (such as ELECTRONS; NEUTRONS; PROTONS; or ALPHA PARTICLES).
  • optics: Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light
  • ray-tracing: Ray tracing is a method for calculating the path of waves or particles through a system. The method is practiced in two distinct forms: * Ray tracing (physics), which is used for analyzing optical and other systems; * Ray tracing (graphics), which is used for 3D image generation
  • solar cooling: Solar air conditioning refers to any air conditioning system that uses solar power. This can be done through passive solar, solar thermal energy conversion and photovoltaic conversion

Licence: cc-by

Site reference: https://www.mdpi.com/1996-1073/17/13/3269/pdf?version=1720003328

DOI reference: https://www.doi.org/10.3390/en17133269

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source https://magazine.sciencepod.net/quantifying-the-shading-effects-of-a-small-scale-rooftop-installed-linear-fresnel-reflector-in-cyprus/

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