Beyond the 2D limit: étendue-squeezing line-focus solar concentrators
Optics Letters
|December 28, 2020
Summary
Researchers developed new line-focus solar concentrators using étendue squeezing, surpassing the 2D limit. These advanced solar concentrators achieve higher concentration ratios for efficient solar power generation.
Area of Science:
- Solar energy
- Optical engineering
- Thermodynamics
Background:
- Line-focus solar concentrators are typically 2D designs extruded into 3D, limiting concentration ratios in air to 212×.
- This 2D limit is significantly lower than the 45000× achievable with 3D solar concentrators.
Purpose of the Study:
- To conceptually demonstrate the possibility of designing line-focus solar concentrators that exceed the conventional 2D concentration limit.
- To achieve high concentration ratios and acceptance angles for line-focus systems suitable for tubular receivers.
Main Methods:
- Utilizing the principle of étendue squeezing to overcome the inherent limitations of 2D designs.
- Simulating two distinct line-focus solar concentrator designs based on étendue squeezing.
Main Results:
- Demonstrated line-focus solar concentrators achieving simulated concentration ratios of 75× and 218×.
- Achieved a ±1° acceptance angle, significantly outperforming the 2D limit of 57× at this angle.
Conclusions:
- Étendue-squeezing offers a pathway to develop advanced line-focus solar concentrators beyond the 2D limit.
- These concentrators, coupled with tracking advancements, could drive a new generation of concentrated solar power systems.
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