1. School of Civil Engineering, Beijing Jiaotong University, 3 Shangyuancun, Beijing 100044, China
2. Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
3. Center for Energy Convergence Research, Green City Research Institute, Korea Institute of Science and Technology (KIST), Hwarangno 14 gil 5, Seongbuk-gu, Seoul 136-791, Republic of Korea
4. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, P. R. China