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A novel dual-diameter closed-loop pulsating heat pipe for a flat plate solar collector

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  • Aref, Latif
  • Fallahzadeh, Rasoul
  • Shabanian, Seyed Reza
  • Hosseinzadeh, Mojtaba

Abstract

The main idea of this investigation is to increase the thermal efficiency of a flat plate closed-loop pulsating heat pipe solar collector by introducing a novel closed-loop pulsating heat pipe (CLPHP) with a dual-diameter structure. The CLPHP with dual-diameter configuration is made of copper with two diameters; larger in the condensation section (inner diameter of 3.5 mm) and smaller in the evaporation and adiabatic sections (inner diameter of 2 mm). The thermal performance of this type of CLPHP was investigated at different filling ratios and inclination angles. Results showed that the thermal performance of the dual-diameter configuration is considerably better than the single-diameter in the vertical and non-vertical orientations. Moreover, in this study, the performance of a flat plate solar collector coupled with the proposed dual-diameter CLPHP (DD-CLPHPSC) is investigated experimentally in outdoor and indoor modes during July and August of 2020, under local weather conditions of Mashhad, Iran. The effects of the filling ratio, inclination angle, and solar intensity were assessed. Under sunny weather conditions, when the direct normal irradiance was 1030 W/m2, the thermal efficiency of the DD-CLPHPSC with a filling ratio of 60% reached 72.4%.

Suggested Citation

  • Aref, Latif & Fallahzadeh, Rasoul & Shabanian, Seyed Reza & Hosseinzadeh, Mojtaba, 2021. "A novel dual-diameter closed-loop pulsating heat pipe for a flat plate solar collector," Energy, Elsevier, vol. 230(C).
    • Handle: RePEc:eee:energy:v:230:y:2021:i:c:s0360544221009993
    DOI: 10.1016/j.energy.2021.120751
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    4. Chen, Tingsen & Liu, Shuli & Zhang, Shaoliang & Shen, Yongliang & Ji, Wenjie & Wang, Zhihao & Li, Wuyan, 2024. "Experimental study on solar wall by considering parametric sensitivity analysis to enhance heat transfer and energy grade using compound parabolic concentrator and pulsating heat pipe," Renewable Energy, Elsevier, vol. 229(C).
    5. Zhai, Chaoqun & Sun, Zhilin & Yang, Yang, 2024. "Experimental and mechanism analysis of a tandem solar thermal system with staged water level reduction," Energy, Elsevier, vol. 313(C).
    6. Xu, Yanrong & Zou, Tingting & Yang, Xudong & Chen, Fei & Luo, Huilong & Li, Ruolin, 2025. "Enhancement strategies and engineering applications of photothermal conversion for evacuated tube solar collectors coupling heat pipes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 220(C).
    7. Dong Zhang & Haixia Li & Jianghao Wu & Qingliang Li & Baorui Xu & Zhoujian An, 2022. "Experimental Study on the Effect of Inclination Angle on the Heat Transfer Characteristics of Pulsating Heat Pipe under Variable Heat Flux," Energies, MDPI, vol. 15(21), pages 1-17, November.

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