Abstract
This research investigates the optimization of solar thermionic energy converters (TECs)through a comprehensive study of material properties, geometric configurations, and thermal
dynamics. Using molybdenum as a key material, the study employs COMSOL Multiphysics to
model and simulate various geometries and thermal conditions, building on previous
experimental work by Hanyu Cen. The primary objectives were to enhance understanding of
TEC performance and identify optimal design parameters for improved efficiency.
Key findings include the superior performance of diamond-shaped geometries over
traditional square and rectangular configurations. The diamond shape's higher surface area
to volume ratio enhances heat dissipation which leads to higher temperature outputs and
efficiencies. The study also reveals that smaller geometries (5μm) produce higher
temperatures compared to larger ones, emphasizing the importance of size optimization in
TEC design.
Additionally, the research explores the effects of varying thermal power input, noting a trade-
off between higher temperatures and reduced efficiency. A comparative analysis of
materials—molybdenum, gold, aluminium, and copper—demonstrates gold's superior
temperature output and efficiency, although molybdenum remains a practical and cost-
effective choice.
The study also examines multi-geometry systems and cascade models, illustrating how
geometric arrangements and material combinations can fine-tune thermal output. The
addition of multiple pyramids to a square base show that optimized spacing, and
configuration can significantly enhance performance.
These findings provide valuable insights into the design and optimization of TECs, with
implications for improving solar energy utilization and advancing sustainable energy
technologies. Future research should focus on further refining these models and exploring
additional material and geometric configurations to maximize TEC performance. This work
contributes to the broader goal of developing high-efficiency solar energy converters, offering
a foundation for future innovations in energy technology.
| Date of Award | 10 Dec 2024 |
|---|---|
| Original language | English |
| Awarding Institution |
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| Supervisor | Martin J Cryan (Supervisor) & Judy Rorison (Supervisor) |