Mitigating PV cell cracking in solar photovoltaic thermal collectors with a novel H-pattern absorber design

This paper introduces a novel absorber design for a Solar Photovoltaic Thermal (PVT) collector, specifically addressing the persistent issue of cell cracking induced by thermal expansion. Despite considerable research efforts to advance PVT technology, cell cracking remains a critical challenge, contributing to decreased collector efficiency. In contrast to previous studies, this research adopts a unique approach. A novel PVT design is proposed, featuring an aluminium alloy structure with a distinctive 'H'-shaped pattern of expansion cavities posi´┐¢tioned between Photovoltaic (PV) cells and the absorber. This innovative design is engineered to mitigate thermal expansion and optimize the overall performance of the collector. A 3-D Computational Fluid Dynamic model, simulated using ANSYS software, validates the proposed PVT design against experimental data from a reference collector. A parametric study explores various H-pattern cavity dimensions, revealing that the 2 mm H-pattern plate cavity design achieves the lowest directional expansion, minimizing the risk of breakage. Results show that the proposed design outperforms the reference collector by 10 %, 2 %, and 8 % in thermal, electrical, and overall efficiency, respectively. Furthermore, the H-pattern design reduces thermal expansion by 20 %, enhancing structural resilience and minimizing the likelihood of PV cell cracking. This study represents a significant advancement in PVT technology, providing a practical and easily implementable solution to the critical issue of cell cracking and presenting an optimal design for real-world applications.