Qingyan Chen is the Vincent P. Reilly Professor of Mechanical Engineering at Purdue University, USA. He also serves as the Editor-in-Chief of the international journal Building and Environment. Zhiqiang Zhai is a Professor of Architectural Engineering at the University of Colorado at Boulder, USA. Xueyi You is a Professor of Environmental Engineering at Tianjin University, China. Tengfei Zhang is a Professor of HVAC at Dalian University of Technology, China.