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Thermal performance of solar water heater using velocity enhancer

Author

Listed:
  • Balaji, K.
  • Iniyan, S.
  • Goic, Ranko

Abstract

This paper theoretically analyses the thermal performance of extended surface of absorber tubing in a flat plate solar collector by using a passive technique to reduce the thermal barrier in a conventional flat plate solar collector. This technique changes the geometry of the flow path of the fluid. The objective is to increase the convective heat transfer coefficient with minimum pressure drop while enhancing the effective heat transfer area between the absorber fluid and the surface it is in contact with. The two types of velocity enhancers used and compared in the work are rod and tube. The velocity enhancers are kept frictionally engaged within the inner side of the absorber tube wall, with the tubes and rod being parallel to fluid flow path. It was found that, while increasing pumping power minimally, the rod velocity enhancer provides greater heat transfer rate than the tube velocity enhancer configuration. Compared to the plain tube, the increase in efficiency of the rod and tube velocity enhancers are 15% and 10%, respectively.

Suggested Citation

  • Balaji, K. & Iniyan, S. & Goic, Ranko, 2018. "Thermal performance of solar water heater using velocity enhancer," Renewable Energy, Elsevier, vol. 115(C), pages 887-895.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:887-895
    DOI: 10.1016/j.renene.2017.09.014
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    References listed on IDEAS

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    1. Ananth, J. & Jaisankar, S., 2014. "Investigation on heat transfer and friction factor characteristics of thermosiphon solar water heating system with left-right twist regularly spaced with rod and spacer," Energy, Elsevier, vol. 65(C), pages 357-363.
    2. Naphon, Paisarn & Wongwises, Somchai, 2006. "A review of flow and heat transfer characteristics in curved tubes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 10(5), pages 463-490, October.
    3. Ho, C.D. & Chen, T.C., 2006. "The recycle effect on the collector efficiency improvement of double-pass sheet-and-tube solar water heaters with external recycle," Renewable Energy, Elsevier, vol. 31(7), pages 953-970.
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    1. Poongavanam, Ganesh Kumar & Panchabikesan, Karthik & Leo, Anto Joseph Deeyoko & Ramalingam, Velraj, 2018. "Experimental investigation on heat transfer augmentation of solar air heater using shot blasted V-corrugated absorber plate," Renewable Energy, Elsevier, vol. 127(C), pages 213-229.
    2. Balaji, K. & Ganesh Kumar, P. & Sakthivadivel, D. & Vigneswaran, V.S. & Iniyan, S., 2019. "Experimental investigation on flat plate solar collector using frictionally engaged thermal performance enhancer in the absorber tube," Renewable Energy, Elsevier, vol. 142(C), pages 62-72.
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    5. Zhu, Weiyu & Xu, Yuanming & Du, Huafei & Li, Jun, 2019. "Thermal performance of high-altitude solar powered scientific balloon," Renewable Energy, Elsevier, vol. 135(C), pages 1078-1096.

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