1. Department of Refrigeration and Cryogenic Engineering, College of Environmental and Energy EngineeringBeijing University of Technology 100 Pingleyuan Road, Chaoyang Beijing 100124 China
2. China Household Electric Appliance Research Institute 6 Yuetan beixiao Str, Xicheng Beijing 100037 China
3. Key Laboratory of Urban Security and Disaster Engineering of Ministry of EducationBeijing University of Technology Beijing 100124 China