1. Department of Agricultural and Forestry Engineering; Higher Technical School of Agricultural Engineering; University of Valladolid. Avenida de Madrid 44, Palencia, 34004; Spain
2. CIEPQPF- Research Centre on Chemical Processes Engineering and Forest Products; Department of Chemical Engineering; University of Coimbra, Pólo II − Rua Sílvio Lima; 3030-790 Coimbra; Portugal