Review regarding defrosting methods for refrigeration and heat pump systems Jamal Al Douri, Kamel S. Hmood, Valentin Apostol, Horatiu Pop, Saleh J. Alqaisy and Elena Beatrice Ibrean E3S Web Conf., 286 (2021) 01012 Published online: 12 July 2021 DOI: 10.1051/e3sconf/202128601012