Methods for calculating the pressure loss of the air flow and energy consumed by the fan of the cotton harvesterRafik Matchanov, Anvar Rizaev, A Yuldashev, Davronbek Kuldoshev and M MirzaevaE3S Web Conf., 264 (2021) 04011DOI: https://doi.org/10.1051/e3sconf/202126404011