Editors-in-ChiefMaria Hadjinicolaou,ProfessorSchool of Science and TechnologyHellenic Open UniversityEmail: hadjinicolaou@eap.grGeorge Hatzigeorgiou,ProfessorSchool of Science and TechnologyHellenic Open UniversityEmail: hatzigeorgiou@eap.gr Contents – Περιεχόμενα A multi-objective optimization approach for improving energy efficiency…