Edwin Chi Yan TSO

City University of Hong Kong

Invited Speaker


Dr. Tso is currently an Assistant Professor of School of Energy and Environment at the City University of Hong Kong (CityU). He received his Bachelor’s degree in Mechanical Engineering (1st class), MPhil degree in Environmental Engineering and PhD degree in Mechanical Engineering from The Hong Kong University of Science and Technology (HKUST) in 2010, 2012 and 2015, respectively. He was awarded the Fulbright – Research Grant Council (RGC) Hong Kong Research Fellowship in 2014, and studied at the University of California, Berkeley (UC Berkeley) in 2015. Upon returning to Hong Kong from UC Berkeley, Dr. Tso worked as a Research Associate at the Department of Mechanical and Aerospace Engineering (MAE), HKUST from 2015 - 2016, before he was promoted to the rank of Research Assistant Professor (2016 - 2018). While at HKUST, Dr. Tso was also a Junior Fellow at the HKUST Jockey Club Institute for Advanced Study (2016 - 2018). In September of 2018, Dr. Tso joined CityU as an Assistant Professor.

Dr. Tso’s research focuses on understanding the fundamentals of heat transfer, energy conversion, and engineered materials. He strives to integrate theory and experiments to create innovative solutions for enhancing thermal management, built environments, space cooling and refrigeration, micro-droplet manipulation, and energy-efficient building technologies, making a great and global impact by addressing the biggest needs and issues in our world. Dr. Tso is also listed among the Top 2% of the world’s most highly cited scientists in his own area (Mechanical Engineering) in 2020 and 2021. Dr. Tso has also filed more than 10 international patents, so he also dedicates a significant effort to promote translational research, targeted at commercialization. Towards this goal, Dr. Tso has established a start-up focusing on the passive radiative cooling technology with an angel fund of >HK$12M for the initial phase. The product of his start-up has been used by different local and international parties, indicating the success of the knowledge transfer from his research to real applications (i.e. creating an impact in society). Last, Dr. Tso is also a Member of The Hong Kong Institution of Engineers (MHKIE) and The American Society of Mechanical Engineers (MASME). 

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Advanced and Smart Building Skin Materials for Carbon Neutrality

Edwin Chi Yan TSO

School of Energy and Environment, City University of Hong Kong

Keywords: passive radiative cooling, thermochromic smart windows, thermal management, energy, and built environment.


With the development of economy, the energy consumption of air conditioning systems has become a major concern. This problem is more serious in Hong Kong, which is located in the subtropical region and has a hot and humid climate. Therefore, the research and development of green building technologies for air conditioning energy-saving plays a vital role in addressing the issues of climate change and energy crisis for both Hong Kong and the world. In this talk, we present a new technology that combines passive radiative cooling and thermochromic smart windows to provide new insights for building energy saving. Specifically, the patented passive radiative cooler is applied to the roof and exterior walls, which can reflect almost all sunlight while emitting mid-infrared thermal radiation to the cold universe, thereby achieving an "electrical-free cooling" effect. In addition, the thermochromic smart windows can automatically change their color subject to the ambient temperature, intelligently tuning the heat gain and loss through the windows, so that the indoor environment can be warm in winter and cool in summer. By combining both the passive radiative cooling and thermochromic smart window technologies, the cooling load of air conditioning can be effectively reduced, achieving significant building energy saving and carbon reduction. The technologies not only will reduce energy consumption and help address the problem of climate change but also bring innovative ideas to the green building industry, promoting economic development and carbon neutrality globally.

Figure 1: Smart and green building “skin” technology: passive radiative cooling and thermochromic smart windows

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