In this article, Lorentz forces impact on Nano enhanced PCM heat transfer during discharging process is simulated in a storage porous unit by means of computational method namely FEM. Lorentz forces and nanoparticles are utilized to accelerate this unsteady phenomenon. Impacts of volume fraction of NEPCM, Hartmann and Rayleigh numbers on discharging process were illustrated. Results reveal that employing Lorentz forces can augment the discharging rate. Discharging time decreases by dispersing nanoparticles. (C) 2018 Elsevier Ltd. All rights reserved.