Chongqing University, Chongqing University - MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, University of Electronic Science and Technology of China (UESTC), Chongqing University, Chongqing University, Chongqing University, Chongqing University, affiliation not provided to SSRN, University of Electronic Science and Technology of China (UESTC) and Chongqing University - MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems