Year: 2024
Type: book-chapter
Abstract: In the current study, the performance of a dimple-roughened solar thermal collector (DRSTC) is investigated within a ( $${\text{Re}}_{\text{xx}}$$ Re xx ) range that spans from 3000 to 48,000. Under constant solar intensity ( $${I}_{\text{sr}}$$ I sr =1000 $${\text{Wm}}^{-2}$$ Wm - 2 ), relative roughness height ( $${e}_{\text{d}}/{D}_{\text{h}}$$ e d / D h ) varied from 0.021 to 0.036, relative roughness pitch ( $$p/{e}_{\text{d}}$$ p / e d ) from 10 to 20, arc angle ( $${\alpha }_{\text{a}}$$ α a ) from 45 to 60°, and temperature rise parameter from 0.003 to 0.02, and the proposed model predicts exergy efficiency of the SAH, and the results obtained can be used as reference for the design of new solar thermal systems. The assessment makes use of advanced MATLAB simulations in order to evaluate the exergetic efficiency $${(}\eta_{{{\text{ex}}}} )$$ ( η ex ) of a DRSTC. At lower $${\text{Re}}_{\text{xx}}$$ Re xx values, $${(}\eta_{{{\text{ex}}}} )$$ ( η ex ) increases uniformly; however, stabilization and decline occur at higher $${\text{Re}}_{\text{xx}}$$ Re xx values. The highest $${(}\eta_{{{\text{ex}}}} )$$ ( η ex ) for the DRSTC is 1.47% under a temperature rise parameter $$(\Delta T/I_{{{\text{sr}}}} )$$ ( Δ T / I sr ) of 0.0071 $${\text{Km}}^{2}{\text{W}}^{-1}$$ Km
Language: English
Topic: Heat Transfer Mechanisms
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,590
Funder: Eötvös Loránd Tudományegyetem
OpenAlex ID: W4405424678