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Silicone oil envelope for enhancing the performance of nanofluid-based direct absorption solar collectors

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  • Bhalla, Vishal
  • Beejawat, Sachin
  • Doshi, Jay
  • Khullar, Vikrant
  • Singh, Harjit
  • Tyagi, Himanshu

Abstract

Nanofluids inherently have high emissivity in the mid-infrared region making them unsuitable for satisfying the conditions of solar selectivity required for direct absorbers. In this study, a layer of silicone oil is located above nanofluid comprising of graphite nanoparticles and deionized water. Silicone oil layer is shown to act as a barrier against the infrared emissions from the nanofluid. High transparency of silicone oil in the visible solar spectrum and high absorptivity in the mid-infrared wavelength range made it an excellent candidate for this study. Solar selectively was achieved by using two different liquid layers (nanofluid and silicone oil) in direct thermal contact. Silicone oil layer on the top of the nanofluid resulted in an approximately 17% higher temperature rise in the nanofluid.

Suggested Citation

  • Bhalla, Vishal & Beejawat, Sachin & Doshi, Jay & Khullar, Vikrant & Singh, Harjit & Tyagi, Himanshu, 2020. "Silicone oil envelope for enhancing the performance of nanofluid-based direct absorption solar collectors," Renewable Energy, Elsevier, vol. 145(C), pages 2733-2740.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:2733-2740
    DOI: 10.1016/j.renene.2019.08.024
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    Cited by:

    1. Vakili, Masoud & Yahyaei, Masood & Ramsay, James & Aghajannezhad, Pouria & Paknezhad, Behnaz, 2021. "Adaptive neuro-fuzzy inference system modeling to predict the performance of graphene nanoplatelets nanofluid-based direct absorption solar collector based on experimental study," Renewable Energy, Elsevier, vol. 163(C), pages 807-824.
    2. Kulkarni, Vismay V. & Bhalla, Vishal & Garg, Kapil & Tyagi, Himanshu, 2021. "Hybrid nanoparticles-laden fluid based spiral solar collector: A proof-of-concept experimental study," Renewable Energy, Elsevier, vol. 179(C), pages 1360-1369.
    3. Joseph, Albin & Sreekumar, Sreehari & Thomas, Shijo, 2020. "Energy and exergy analysis of SiO2/Ag-CuO plasmonic nanofluid on direct absorption parabolic solar collector," Renewable Energy, Elsevier, vol. 162(C), pages 1655-1664.

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