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Thermal enhancement of solar parabolic trough collectors by using nanofluids and converging-diverging absorber tube

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  • Bellos, E.
  • Tzivanidis, C.
  • Antonopoulos, K.A.
  • Gkinis, G.

Abstract

Parabolic trough collectors are the most mature technology for utilizing the solar energy in high temperature applications. The objective of this study is the thermal efficiency enhancement of the commercial parabolic collector IST-PTC by increasing the convective heat transfer coefficient between the working fluid and the absorber. There are two main factors which influence on this parameter, the working fluid type and the absorber geometry. For this reason three working fluids are investigated, thermal oil, thermal oil with nanoparticles and pressurized water. Moreover, a dimpled absorber tube with sine geometry is tested because this shape increases the heat transfer surface and increases the turbulence in the flow. The final results show that these two techniques improve the heat transfer coefficient and the thermal efficiency of the collector. More specifically, the use of nanofluids increases the collector efficiency by 4.25% while the geometry improvement increases the efficiency by 4.55%. Furthermore, collector parameters such as the heat loss coefficient, the exergetic efficiency, the pressure losses and the absorber temperature are presented for all the examined cases. The model is designed with Solidworks and is simulated by its flow simulation studio.

Suggested Citation

  • Bellos, E. & Tzivanidis, C. & Antonopoulos, K.A. & Gkinis, G., 2016. "Thermal enhancement of solar parabolic trough collectors by using nanofluids and converging-diverging absorber tube," Renewable Energy, Elsevier, vol. 94(C), pages 213-222.
    • Handle: RePEc:eee:renene:v:94:y:2016:i:c:p:213-222
    DOI: 10.1016/j.renene.2016.03.062
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    References listed on IDEAS

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