研究目的
To predict the thermal behavior of a PV panel and its consequences on the internal mechanical stresses at the interfaces between different layers under nominal operating conditions.
研究成果
The thermo-mechanical model successfully predicted temperature and stress distributions in a PV panel under NOCT conditions, with results validating against manufacturer data and previous simulations. Stresses were found to be low (order of kPa) but could contribute to long-term mechanical fatigue and deterioration, especially in severe conditions. Future work should include simulations under other conditions and study edge effects due to panel framing.
研究不足
The study is limited to 2D simulations under NOCT conditions, which are favorable and may not represent severe operating conditions like those in desert climates. The model neglects anti-reflective coating and copper ribbon wires, assumes isotropic and temperature-independent material properties, and does not consider edge effects or real-time varying conditions. Higher stresses and displacements might occur in harsher environments, and a parametric study or 3D modeling could provide more comprehensive insights.
1：Experimental Design and Method Selection:
Fully coupled thermo-mechanical finite element simulations were performed using the commercial code ABAQUS/CAE. The model was inspired by previous work and takes into account the multilayered nature of the PV panel, with isotropic and temperature-independent material behavior assumed.
2：Sample Selection and Data Sources:
The PV panel geometry is based on the commercial monocrystalline VSMS275 panel manufactured by VOLTEC Solar. Thermo-mechanical properties of materials (front glass, silicon, EVA, PET) were taken from literature sources.
3：List of Experimental Equipment and Materials:
ABAQUS/CAE software for FE simulations; materials include front glass, silicon cells, EVA encapsulant, PET backsheet with specified thicknesses and properties.
4：Experimental Procedures and Operational Workflow:
A 2D model was developed with mesh generated using CPE4T elements. Transient state simulation under NOCT conditions (irradiance=800 W/m2, ambient temperature=20°C, wind speed=1 m/s, open circuit) was performed to reach equilibrium. Heat generation, convective, and radiative fluxes were computed and imposed. Mechanical boundary conditions included symmetry at sides and free boundaries at top and bottom, with an anchor point on the glass.
5：Data Analysis Methods:
Results were compared with previous MATLAB simulations for validation. Temperature, displacement, and stress distributions (e.g., S22, S12) were analyzed to identify stress concentrations and potential failure areas.
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