1. Research Assistant, Dept. of Civil Engineering, Univ. of Thessaly, 383 34 Volos, Greece (corresponding author).
2. Professor, Dept. of Mechanical Engineering, Univ. of Thessaly, 383 34 Volos, Greece; and Professor, International Institute for Carbon Neutral Energy Research (WPI-I2CNER) Kyushu Univ., 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
3. Professor, Dept. of Civil Engineering, Univ. of Thessaly, 383 34 Volos, Greece.