1. Building Energy Research Group Department of Building and Real Estate The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China
2. The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen Guangdong 518057 P. R. China
3. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun Jilin 130022 P. R. China
4. School of Energy and Environment City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong 999077 P. R. China