1. School of Economics, Business Administration & Legal Studies; International Hellenic University, 14th km Thessaloniki - N; Moudania 57001 Thermi Greece
2. Institute for Research and Technology Thessaly; Centre for Research and Technology-Hellas; 38333 Volos Greece
3. Laboratory of Heat Transfer and Environmental Engineering; Aristotle University Thessaloniki; Box 483, 54124 Thessaloniki Greece