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Performance optimization of larger-aperture parabolic trough concentrator solar power station using multi-stage heating technology

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  • Jing-hu, Gong
  • Yong, Li
  • Jun, Wang
  • Lund, Peter

Abstract

The large-aperture parabolic trough concentrator (PTC) solar power can reduce the initial investment and increase the outlet temperature. However, the use of a single absorber tube (AT) cannot meet the requirements of maximize efficiency and the outlet temperature of 580 °C. Therefore, a multi-stage heating technology is proposed to improve the efficiency and outlet temperature in this study. The single-loop, consisting of a semi-circular AT with two outer fins, a semi-circular and circular AT, makes the temperature rise from 300 °C to 580 °C. The results show an optical efficiency of 79.1% and a thermal efficiency of 72.8%, for a 1400 m single-loop and a mass flow of 6.1–19.9 kg/s (corresponding to DNI of 400–100 W/m2). The large-aperture multi-stage PTC solar power established in Dunhuang, China (E 94.66, N 40.14) has an annual average solar-to-electric efficiency of 24.50%, higher than 20% at present. At the same time, homogenizing the solar radiation flux at the AT surface at the high-temperature section can reduce the length of the high-temperature region and increase the thermal efficiency, and the solar-to-electric efficiency of a large-aperture multi-stage PTC solar power can be increased by improving the thermal efficiency and the exit temperature.

Suggested Citation

  • Jing-hu, Gong & Yong, Li & Jun, Wang & Lund, Peter, 2023. "Performance optimization of larger-aperture parabolic trough concentrator solar power station using multi-stage heating technology," Energy, Elsevier, vol. 268(C).
    • Handle: RePEc:eee:energy:v:268:y:2023:i:c:s0360544223000348
    DOI: 10.1016/j.energy.2023.126640
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