An Investigation into Parabolic Trough Solar Thermal Power Generation System with Double-Stage Concentrated Heat Collection

GAI Zhongrui; ZHAO Kai; YANG Tianlong; RAO Qiong; PAN Ying; JIN Hongguang

doi:10.7652/xjtuxb202502004

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An Investigation into Parabolic Trough Solar Thermal Power Generation System with Double-Stage Concentrated Heat Collection

更新时间：2026-01-06

- An Investigation into Parabolic Trough Solar Thermal Power Generation System with Double-Stage Concentrated Heat Collection
- Journal of Xi’an Jiaotong University Vol. 59, Issue 2, Pages: 32-40(2025)
- 作者机构：
  
  1.西安交通大学动力工程多相流国家重点实验室， 710049，西安
  2.中国科学院工程热物理研究所， 100190，北京
  3.郑州大学机械与动力工程学院， 450001，郑州
  4.中国科学院大学， 100049，北京
  5.中国科学院长时规模储能重点实验室， 100190，北京
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202502004
  CLC： TK51
- Received：25 June 2024，
  
  Online First：24 October 2024，
  
  Published：10 February 2025
- 稿件说明：
移动端阅览
GAI Zhongrui, ZHAO Kai, YANG Tianlong, et al. An Investigation into Parabolic Trough Solar Thermal Power Generation System with Double-Stage Concentrated Heat Collection[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 32-40.
DOI：

GAI Zhongrui, ZHAO Kai, YANG Tianlong, et al. An Investigation into Parabolic Trough Solar Thermal Power Generation System with Double-Stage Concentrated Heat Collection[J]. Journal of Xi’an Jiaotong University, 2025, 59(2): 32-40. DOI： 10.7652/xjtuxb202502004.

摘要

为了提高槽式光热发电系统的性能，通过高、低聚光比镜场的耦合布置，辅以两种传热介质的搭配，建立了双级聚光集热的槽式太阳能热发电系统模型，与传统槽式光热发电系统展开对比，得到了双级系统集热、换热性能提升的机理和系统关键过程

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损失减小的原因。对双级系统进行能量分析和

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分析，展示了双级系统中的能量和

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流动情况，揭示了在镜场侧和动力侧的各项能量和

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损失的分布规律。结果表明：双级聚光集热系统中镜场的耦合布置有效地提高了系统的集热性能，两种传热介质的协同搭配改善了系统的换热性能。损失分布方面，光学损失仍是导致系统集热损失的重要因素，同时光热转化过程的不可逆损失在

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损失中占比较大，具有较大的提升潜力。双级系统的热效率可达到27.35%，

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效率达到28.84%，相较于传统单聚光比、单介质的槽式太阳能热发电系统，热效率和

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效率均可提升0.9%~1.5%，相同

发电量下可节省镜场面积4%~6%。研究为槽式太阳能热发电系统提出了改进策略，为进一步优化研究提供了一定的理论依据。

Abstract

To improve the performance of parabolic trough solar thermal power generation systems

a parabolic trough solar thermal power generation system model with double-stage concentrated heat collection (the double-stage system) was developed by coupling mirror fields with both high and low concentration ratios and combining two types of heat transfer fluids. The system was benchmarked against typical solar thermal power generation systems to explore the mechanisms for the improved heat collection and transfer performance

as well as the reasons for reduced exergy losses in critical processes of the double-stage system. Meanwhile

detailed energy and exergy analyses were conducted on the double-stage system

revealing the energy and exergy flow in the double-stage system and the distribution patterns of energy and exergy losses on both the mirror field section and the power generation section. The results show that coupling mirror fields effectively improved heat collection performance

while combining two types of heat transfer fluids improved the heat transfer process. As for the distribution of losses

the optical loss was still a significant factor contributing to heat collection losses in the system

and a large proportion of exergy losses stemmed from the solar-to-heat conversion process

highlighting a significant potential for improvement. The double-stage system could reach a thermal efficiency of 27.35% and an exergy efficiency of 28.84%

with increases of 0.9%—1.5% in both thermal and exergy efficiency over traditional systems using a single concentration ratio and sole heat transfer fluid. Moreover

the double-stage approach reduced the mirror field area by 4%—6% at the same power output. This study proposes an improved strategy for parabolic trough solar thermal power generation systems

providing a theoretical basis for further research and optimization.

关键词

Keywords

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