Erratum to: Numerical modelling of phase-change material used for PV panels coolingAssia Sellami, Rabie Elotmani, Khalid Kandoussi, Mohamed Eljouad, Abdelowahed Hajjaji and M’Hamed BoutaousEur. Phys. J. Plus, 133 7 (2018) 255DOI: https://doi.org/10.1140/epjp/i2018-12115-x