Xu Weiqiang Born in 1981, he got B.E. degree from Beijing University of Aeronautics and Astronautics in 2003, and then was recommended to be a Ph.D. candidate there. His main research interests are phase change thermal storage, heatand mass-transfer. E-mail: xwq@ase.buaa.edu.cn Corresponding author. Tel: +86-10-82317514. E-mail address. yuanxg@buaa.edu.cnYuan Xiugan Born in 1934, he got Ph.D. degree from RWTH Aachen University in 1988, and now he is a professor at Beijing University of Aeronautics and Astronautics. His main research interests are environmental control of aircraft, human-machine ergonomics and solar dynamic power generation. E-mail: yuanxg@buaa.edu.cn