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<p>The main renewable energy source that produces carbon-free electricity is solar energy. Nevertheless, the solar power tower (SPT) technology is associated with a number of irreversibilities that are unavoidable. In order to improve the solar power plant performance, four combinations of combined cycles have been investigated in this work to gather solar heat from the SPT system. The performance of these combined cycles was compared with a standard HBC system that is based on SPT. The basic organic Rankine cycle (ORC), recuperative ORC (RORC), regenerative ORC (RGORC), and regenerative–recuperative ORC (RRORC) were employed as bottoming cycles in these four suggested combined cycles, while the helium Brayton cycle (HBC) was used as the topping cycle. The suggested power generation systems’ energy and exergy analysis was carried out utilising a numerical method. Out of all the power generation systems that were taken into consideration, it was determined that the SPT-HBC-RRORC system performed the best. In comparison with the conventional system (SPT-HBC), the SPT-HBC-RRORC system achieved work output, exergy efficiency, and energy efficiency by 21.69%, 8.09%, and 7.69% greater, respectively. However, compared to the SPT-HBC-basic ORC, the SPT-HBC-RRORC system exhibited greater energy efficiency, exergy efficiency, and work production by 5.44%, 5.08%, and 18.51%, respectively. The configuration SPT-HBC-RRORC is therefore considerably superior to the traditional SPT-HBC configuration.</p>

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A comparative study of a solar power tower-based combined helium Brayton cycle and organic Rankine cycles

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Yunis Khan,
  • Pawan Kumar Singh,
  • Shikha Gupta

摘要

The main renewable energy source that produces carbon-free electricity is solar energy. Nevertheless, the solar power tower (SPT) technology is associated with a number of irreversibilities that are unavoidable. In order to improve the solar power plant performance, four combinations of combined cycles have been investigated in this work to gather solar heat from the SPT system. The performance of these combined cycles was compared with a standard HBC system that is based on SPT. The basic organic Rankine cycle (ORC), recuperative ORC (RORC), regenerative ORC (RGORC), and regenerative–recuperative ORC (RRORC) were employed as bottoming cycles in these four suggested combined cycles, while the helium Brayton cycle (HBC) was used as the topping cycle. The suggested power generation systems’ energy and exergy analysis was carried out utilising a numerical method. Out of all the power generation systems that were taken into consideration, it was determined that the SPT-HBC-RRORC system performed the best. In comparison with the conventional system (SPT-HBC), the SPT-HBC-RRORC system achieved work output, exergy efficiency, and energy efficiency by 21.69%, 8.09%, and 7.69% greater, respectively. However, compared to the SPT-HBC-basic ORC, the SPT-HBC-RRORC system exhibited greater energy efficiency, exergy efficiency, and work production by 5.44%, 5.08%, and 18.51%, respectively. The configuration SPT-HBC-RRORC is therefore considerably superior to the traditional SPT-HBC configuration.