1. University of Santiago de Compostela; EPS, GICEMA, Campus Universitario s/n; 27002 Lugo Spain
2. Department of Energy; University of Oviedo, Energy Building (EDZE); Campus de Viesques s/n 33271 Gijón Spain
3. Department of Energy and Fluid Mechanics Engineering; University of Valladolid; Paseo del Cauce 59 47011 Valladolid Spain
4. School of Marine Science and Engineering; Plymouth University; Plymouth PL4 8AA UK