1. Department of Industrial Engineering, University of Florence, 50139 Firenze, Italy
2. RE-CORD (Renewable Energy Consortium for Research and Demonstration), 50038 Scarperia e San Piero, Italy
3. Department of Civil and Environmental Engineering, University of Florence, 50139 Firenze, Italy
4. “Galileo Ferraris” Energy Department, Polytechnic of Turin, 10129 Torino, Italy