材料科学
温度循环
光伏系统
有限元法
热的
复合材料
热膨胀
粘弹性
压力(语言学)
弯曲
太阳能电池
结构工程
光电子学
工程类
热力学
电气工程
哲学
物理
语言学
作者
Ulrich Eitner,Sarah Kajari‐Schröder,Marc Köntges,Holm Altenbach
出处
期刊:Advanced structured materials
日期:2011-01-01
卷期号:: 453-468
被引量:48
标识
DOI:10.1007/978-3-642-21855-2_29
摘要
The long-term stability of photovoltaic (PV) modules is largely influenced by the module’s ability to withstand thermal cycling between −40°C and 85°C. Due to different coefficients of thermal expansion (CTE) of the different module materials the change in temperature creates stresses. We quantify these thermomechanical stresses by performing a Finite-Element-analysis of a 60 cell module during thermal cycling. We therefore start by the experimental characterization of each material layer. In particular, the polymeric encapsulant is characterized by three alternative models in order to stepwise consider the time- and temperature-dependence in the simulation. Experiments performed with laminated samples are used to validate the computational model. We find that taking into account the viscoelasticity of the encapsulation layers gives the best agreement with experiments. The Finite-Element-analysis of the complete module shows that the solar cells are under high compressive stress of up to 76 MPa as they are sandwiched between the stiff front glass and the strongly contracting plastic back sheet. The non-symmetrical structure of the 5.55 mm thick module with glass being the thickest component (4 mm) leads to bending during the thermal cycle.
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