1. Key
Laboratory of Low-grade Energy Utilization Technologies and Systems
(Chongqing University), Ministry of Education, Chongqing 400030, China
2. Institute
of Engineering Thermophysics, Chongqing University, Chongqing 400030, China
3. Department
of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom,
Kowloon, Hong Kong China