TY - JOUR

T1 - Thermofluids analysis of four novel anchor-shaped turbulator and eco-friendly nanofluid (GAGNPs /H2O) in a parabolic trough solar collector

T2 - A CFD modeling approach

AU - Gholinia, M.

AU - Ghobadi, A. H.

AU - Shahcheraghi, E.

AU - Armin, M.

N1 - Publisher Copyright: © 2024

PY - 2025/1

Y1 - 2025/1

N2 - In this paper, four new turbulator models are implemented inside the absorber tube of the Parabolic Trough Solar Collector (PTSC) in a linear arrangement (anchored shape) to regulate and standardize its surface temperature. The study analyzes the impact of parameters such as heat transfer coefficient (h), friction factor (f), Nusselt number (Nu), and outlet temperature (Tout). Moreover, a new type of nanofluid (GAGNPs/H2O) has been utilized, consisting of gallic acid combined with graphene nanoplatelets (GNPs), known for its environmental friendliness. The solar heat flux (SHF) in the environment is calculated using the Monte Carlo Radiation Transfer Method (MCRT) with C++ code. The key findings indicate that at Reynolds number 25,000, replacing the simple absorber tube with the DEA, DEA-f, FEA, and FEA-f models increases the Nusselt number by ∼3.99 %, ∼5.40 %, ∼14.08 %, and ∼16.20 %, respectively. Additionally, increasing fin height from 34 mm to 58 mm at this Reynolds number results in ∼ 18.26 % increase in the Nusselt number, while increasing the outlet temperature by ∼0.08 %. Increasing the top height from 34 mm to 58 mm can increase efficiency by up to 8.20 %. The efficiency of the PTSC decreased by approximately ∼3.04 % when the inlet temperature was increased from 300 K to 345 K in FEA-f turbulator (H: 58 mm). Furthermore, increasing the concentration of GAGNPs/H2O nanofluid from 0.025 % to 0.1 % in the same FEA-f turbulator (H: 58 mm) resulted in ∼ 4.50 % increase in efficiency.

AB - In this paper, four new turbulator models are implemented inside the absorber tube of the Parabolic Trough Solar Collector (PTSC) in a linear arrangement (anchored shape) to regulate and standardize its surface temperature. The study analyzes the impact of parameters such as heat transfer coefficient (h), friction factor (f), Nusselt number (Nu), and outlet temperature (Tout). Moreover, a new type of nanofluid (GAGNPs/H2O) has been utilized, consisting of gallic acid combined with graphene nanoplatelets (GNPs), known for its environmental friendliness. The solar heat flux (SHF) in the environment is calculated using the Monte Carlo Radiation Transfer Method (MCRT) with C++ code. The key findings indicate that at Reynolds number 25,000, replacing the simple absorber tube with the DEA, DEA-f, FEA, and FEA-f models increases the Nusselt number by ∼3.99 %, ∼5.40 %, ∼14.08 %, and ∼16.20 %, respectively. Additionally, increasing fin height from 34 mm to 58 mm at this Reynolds number results in ∼ 18.26 % increase in the Nusselt number, while increasing the outlet temperature by ∼0.08 %. Increasing the top height from 34 mm to 58 mm can increase efficiency by up to 8.20 %. The efficiency of the PTSC decreased by approximately ∼3.04 % when the inlet temperature was increased from 300 K to 345 K in FEA-f turbulator (H: 58 mm). Furthermore, increasing the concentration of GAGNPs/H2O nanofluid from 0.025 % to 0.1 % in the same FEA-f turbulator (H: 58 mm) resulted in ∼ 4.50 % increase in efficiency.

KW - Anchor-shaped turbulator

KW - Eco-friendly nanofluid

KW - friction factor

KW - Nusselt number

KW - Parabolic trough solar collector (PTSC)

UR - http://www.scopus.com/inward/record.url?scp=85212927437&partnerID=8YFLogxK

U2 - 10.1016/j.ijft.2024.101028

DO - 10.1016/j.ijft.2024.101028

M3 - Article

AN - SCOPUS:85212927437

VL - 25

JO - International Journal of Thermofluids

JF - International Journal of Thermofluids

M1 - 101028

ER -