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Field synergy analysis for turbulent heat transfer on ribs roughened solar air heater

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  • Hamid, Mohammed O.A.
  • Zhang, Bo

Abstract

Convective turbulent heat transfer field synergy equations for a solar air heater channel with rib turbulators are developed based on the extremum principle of heat transfer potential capacity dissipation. Field synergy equations can be used to increase the field synergy between the velocity vector and temperature gradient fields over the entire heat flow domain to enhance the convective turbulent heat transfer. Solution of the field synergy equations gives the optimal flow field of swirls flow under the ribs and in the cavity area (i.e. between rib to rib), which are followed by a gradual increase of Nusselt number up to following rib, having the best field synergy for a different viscous dissipation. Using optimal velocity patterns as a guide, the design of solid inclined, curved and vertical baffles can be introduced in actual applications, so as to generate the desired swirls flow and enhance the overall coverage of turbulent heat exchange. As illustrative examples, the local field synergy angle analyses for turbulent heat transfer in ribs roughened channel with/without solid baffles are presented. Results show that the solid curved baffles mounted near absorber plate has a best performance evaluation criterion of 0.99.

Suggested Citation

  • Hamid, Mohammed O.A. & Zhang, Bo, 2015. "Field synergy analysis for turbulent heat transfer on ribs roughened solar air heater," Renewable Energy, Elsevier, vol. 83(C), pages 1007-1019.
  • Handle: RePEc:eee:renene:v:83:y:2015:i:c:p:1007-1019
    DOI: 10.1016/j.renene.2015.05.031
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    References listed on IDEAS

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    2. Zhao, Xiaohuan & E, Jiaqiang & Zhang, Zhiqing & Chen, Jingwei & Liao, Gaoliang & Zhang, Feng & Leng, Erwei & Han, Dandan & Hu, Wenyu, 2020. "A review on heat enhancement in thermal energy conversion and management using Field Synergy Principle," Applied Energy, Elsevier, vol. 257(C).
    3. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, vol. 11(11), pages 1-20, November.
    4. Chauhan, Ranchan & Singh, Tej & Thakur, N.S. & Patnaik, Amar, 2016. "Optimization of parameters in solar thermal collector provided with impinging air jets based upon preference selection index method," Renewable Energy, Elsevier, vol. 99(C), pages 118-126.
    5. Strušnik, Dušan & Brandl, Daniel & Schober, Helmut & Ferčec, Janko & Avsec, Jurij, 2020. "A simulation model of the application of the solar STAF panel heat transfer and noise reduction with and without a transparent plate: A renewable energy review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
    6. Mgbemene, Chigbo & Jacobs, Ifeanyi & Okoani, Anthony & Ononiwu, Ndudim, 2022. "Experimental investigation on the performance of aluminium soda can solar air heater," Renewable Energy, Elsevier, vol. 195(C), pages 182-193.

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