Simulation of Water Vapor Ingress into PV-Modules under Different Climatic Conditions

Table 1

Calculated activation energies 𝐸_𝐴 of the diffusion process of water vapor for the materials used in the FEM simulations. The values of the back sheet-materials are effective 𝐸_𝐴 measured for the layered structure.

Material	Thickness (μm)	𝐸𝐴 of diffusion process [kJ·mol^−1·K^−1]
PET-based (back sheet)	350	39,2
PA-based (back sheet)	350	54,1
EVA (encapsulant)	1000	35,7