Numerical modelling of phase-change material used for PV panels cooling Assia Sellami, Rabie Elotmani, Khalid Kandoussi, Mohamed Eljouad, Abdelowahed Hajjaji and M’Hamed Boutaous Eur. Phys. J. Plus, 132 12 (2017) 553 Published online: 29 December 2017 DOI: 10.1140/epjp/i2017-11817-9