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New experimental investigation of the circumferential temperature uniformity for a PTC absorber

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  • Halimi, Mohammed
  • El Amrani, Aumeur
  • Messaoudi, Choukri

Abstract

In this work, an experimental investigation of non-uniform circumferential temperature distribution (CTD) of a PTC absorber is done. Indeed, to evaluate the absorber CTD, a new method is reported by using real IR thermography profiles. The effects of focal length, absorber diameter, and outer glass cover (OGC) on the CTD are investigated. Moreover, a data visualization and statistical analysis are carried out. The most uniform and profitable flux distribution is found for a diameter of 0.042 m and a focal distance of 0.19 m. For this configuration, the highest ηO obtained in the cases with and without OGC is of about 57.16% and 60.87%, respectively. We notice that the temperature gradients and peaks increase gradually with the distance; a maximum temperature gap (ΔTmax) of 72 °C is reached for the distance of 0.26 m. In the case of OGC, the ΔTmax is only of about 63.6 °C (i.e., a difference of 8.4 °C). Thus, in the case of non-OGC, the highest mean and median temperatures of about 73.15 °C and 70.20 °C, respectively, are reported for a distance of 0.19 m. However, for the OGC case, the highest temperature values of about 80.8 °C and 76.8 °C, respectively, are reported for a distance of 0.22 m. In addition, the highest CTD uniformity is reported for a distance of 0.19 m, where an increase in the uniformity of about 2% is observed for the OGC use.

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  • Halimi, Mohammed & El Amrani, Aumeur & Messaoudi, Choukri, 2021. "New experimental investigation of the circumferential temperature uniformity for a PTC absorber," Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:energy:v:234:y:2021:i:c:s036054422101536x
    DOI: 10.1016/j.energy.2021.121288
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    2. Stanek, Bartosz & Węcel, Daniel & Bartela, Łukasz & Rulik, Sebastian, 2022. "Solar tracker error impact on linear absorbers efficiency in parabolic trough collector – Optical and thermodynamic study," Renewable Energy, Elsevier, vol. 196(C), pages 598-609.

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