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Influence of power step on the behavior of an Open Natural Circulation Loop as applied to a Parabolic Trough Collector

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  • Jinshah, B.S.
  • Balasubramanian, K.R.
  • Kottala, Ravikumar
  • Divakar, S.

Abstract

This paper investigates the dynamic behaviour of a low pressure open natural circulation loop applied to a parabolic trough collector. An in-house experimental setup is developed to perform the test. The experiments are performed on two distinct modes: H-mode and S-mode, corresponding to single-phase and two-phase flow. Three distinct power amplitude modes viz, 250, 325, and 464.3 W with a power step number of 24, 18 and 12 having a duration of 15, 20 and 30 min are considered. A Fast Fourier Transform analysis revealed that the flow in the loops is stable with a maximum decay ratio of 0.726. Instabilities, including Density Wave Oscillation, geysering and flashing, are observed during the test. Moreover, the thermal inertia of the loop has a significant role in the initial stage of power steps. An increase in the power step size conferred a 9.1%–33.4% increase in the outlet temperature of water in H-mode. In S-mode, an increase in power step size delayed the onset of boiling and reduced the duration of boiling by 2.8–14.32% and 8.03–22.02%. The loop can generate a mass flux of 40–42.5 kgm2s−1 in H-mode and up to 400 kgm2s−1 in S-mode, which is significant.

Suggested Citation

  • Jinshah, B.S. & Balasubramanian, K.R. & Kottala, Ravikumar & Divakar, S., 2022. "Influence of power step on the behavior of an Open Natural Circulation Loop as applied to a Parabolic Trough Collector," Renewable Energy, Elsevier, vol. 181(C), pages 1046-1061.
    • Handle: RePEc:eee:renene:v:181:y:2022:i:c:p:1046-1061
    DOI: 10.1016/j.renene.2021.09.095
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    References listed on IDEAS

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    1. Zhang, Liang & Yu, Zitao & Fan, Liwu & Wang, Wujun & Chen, Huan & Hu, Yacai & Fan, Jianren & Ni, Mingjiang & Cen, Kefa, 2013. "An experimental investigation of the heat losses of a U-type solar heat pipe receiver of a parabolic trough collector-based natural circulation steam generation system," Renewable Energy, Elsevier, vol. 57(C), pages 262-268.
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    1. Dey, Subhashish & Sreenivasulu, Anduri & Veerendra, G.T.N. & Rao, K. Venkateswara & Babu, P.S.S. Anjaneya, 2022. "Renewable energy present status and future potentials in India: An overview," Innovation and Green Development, Elsevier, vol. 1(1).
    2. Ravi Kumar Kottala & Bharat Kumar Chigilipalli & Srinivasnaik Mukuloth & Ragavanantham Shanmugam & Venkata Charan Kantumuchu & Sirisha Bhadrakali Ainapurapu & Muralimohan Cheepu, 2023. "Thermal Degradation Studies and Machine Learning Modelling of Nano-Enhanced Sugar Alcohol-Based Phase Change Materials for Medium Temperature Applications," Energies, MDPI, vol. 16(5), pages 1-24, February.

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