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Inducing swirl flow inside the pipes of flat-plate solar collector by using multiple nozzles for enhancing thermal performance

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  • Cao, Yan
  • Ayed, Hamdi
  • Hashemian, Mehran
  • Issakhov, Alibek
  • Jarad, Fahd
  • Wae-hayee, Makatar

Abstract

In this numerical study, an attempt has been made to improve the thermal performance of the flat-plate solar collector (FPSC) by inducing the swirl flow inside the tube by the considered nozzles. To this end, the effect of the number of circumferential nozzles and their inclination angles was taken into the account. The considered number of nozzles was "single", ''dual'', ''triple'', and ''quad''. For each of the said cases, the inclination angle of nozzles was taken 30°, 45°, 60°, and 90° (A30, A45, A60, A90). Moreover, the mass flow rate of single-nozzle pipe was considered 0.2 kg/s, 1 kg/s, and 2 kg/s. To analyze all of the cases under identical conditions, the said mass flow rates were distributed equally among all of the nozzles (for ''dual'', ''triple'', and ''quad''). All of the characteristics were defined in a form of "A…-D…-N…-M…'' where ''A…'', "D…", "N…", and "M…" stand for angle of injection, diameter of pipe, nozzle cross-section edge, and mass flow rate, respectively. Numerical simulation (3-dimensional) of the system was performed by Finite Volume Method (FVM). The turbulence nature of flow was simulated by the k-omega SST (shear stress transport) turbulent model. Results showed that the "single-nozzle'' swirl generator had the highest thermal performance factor (TPF) so that for all cases its values were greater than unit. Mass flow rate growth increases Nu, heat extraction rate, and kinetic energy rate (KER) while drops friction factor and outlet temperature. Increment of injection angle increases outlet temperature and friction factor and reduces KER. The maximum and minimum values of TPF are 4.19 and 0.44 which belong to "single; A30-D50-N12.5-M0.2" and "quad; A90-D50-N12.5-M0.5", respectively.

Suggested Citation

  • Cao, Yan & Ayed, Hamdi & Hashemian, Mehran & Issakhov, Alibek & Jarad, Fahd & Wae-hayee, Makatar, 2021. "Inducing swirl flow inside the pipes of flat-plate solar collector by using multiple nozzles for enhancing thermal performance," Renewable Energy, Elsevier, vol. 180(C), pages 1344-1357.
    • Handle: RePEc:eee:renene:v:180:y:2021:i:c:p:1344-1357
    DOI: 10.1016/j.renene.2021.09.018
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    1. Hashemian, Mehran & Jafarmadar, Samad & Khalilarya, Shahram & Faraji, Masoud, 2022. "Energy harvesting feasibility from photovoltaic/thermal (PV/T) hybrid system with Ag/Cr2O3-glycerol nanofluid optical filter," Renewable Energy, Elsevier, vol. 198(C), pages 426-439.
    2. Cao, Yan & Hashemian, Mehran & Ayed, Hamdi & Shawabkeh, Ali & Issakhov, Alibek & Wae-hayee, Makatar, 2022. "Design-eligibility study of solar thermal helically coiled heat exchanging system with annular dimples by irreversibility concept," Renewable Energy, Elsevier, vol. 183(C), pages 369-384.
    3. Gao, Datong & Wu, Lijun & Hao, Yong & Pei, Gang, 2022. "Ultrahigh-efficiency solar energy harvesting via a non-concentrating evacuated aerogel flat-plate solar collector," Renewable Energy, Elsevier, vol. 196(C), pages 1455-1468.

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