1. Professor, Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Chongqing Univ., Ministry of Education, Chongqing 400030, P.R. China (corresponding author).
2. Graduate Student, Dept. of Thermal Engineering, Chongqing Univ., Chongqing 400030, P.R. China.
3. Professor, Director, Institute for Energy and Environmental Research, Dept. of Thermal Engineering, Chongqing Univ., Chongqing 400030, P.R. China.
4. Professor, Deputy Director, Institute for Energy and Environmental Research, Dept. of Thermal Engineering, Chongqing Univ., Chongqing 400030, P.R. China.
5. Professor, Dept. of Thermal Engineering, Chongqing Univ., Chongqing 400030, P.R. China.