1. Toshiba Energy Systems & Solutions Corporation, Energy Systems Research & Development Center, 4-1 Ukishima-cho, Kawasaki-ku, Kawasaki 210-0862, Japan
2. Toshiba Energy Systems & Solutions Corporation, Isogo Engineering Center, 8 Shinsugita-cho, Isogo-ku, Yokohama 235-0032, Japan
3. Osaka University, Division of Sustainable Energy and Environmental Engineering, 2-1 Yamada-oka, Suita-shi, Osaka 565-0871, Japan