Frosting for Air Source Heat Pumps

Mengjie Song is a Professor in the Department of Energy and Power Engineering, as well as a Teli Young Scholar and the Director of the Frost Lab in the School of Mechanical Engineering at the Beijing Institute of Technology, China. He is also the Editor-in-Chief of Recent Patents on Mechanical Engineering (EI, Scopus), Associate Editor of Frontiers in Energy Research (SCI, IF=2.746). He also works as DECRA Research Fellow at the Sustainable Buildings Research Centre (SBRC) in the Faculty of Engineering and Information Sciences at the University of Wollongong, Australia, and as a Guest Professor of Tomas Bata University in the Czech Republic. Prof. Song has worked for over a decade on the mechanism study of heat and mass transfer coupled with flow. On the topic of frosting and defrosting for air source heat pump, he proposed a series of definitions to describe thermophysical phenomena, such as even/uneven frosting/defrosting, and frosting/defrosting evenness value. His current research interests include solidification of water droplets at different scales and (anti-/de)icing for aircraft surface, and frosting and defrosting for a multi-circuit heat exchanger in refrigeration systems. He has published 122 journal articles and participated in projects from China, Hong Kong, Singapore, Japan, and Australia, handling a total of over 17 million yuan in funding, including 12 as PI. Recently, he was selected for the World’s Top 2% Scientists 2021 (Singleyr) list. Long Zhang is a Postdoctoral Fellow in the Department of Energy and Power Engineering at the Beijing Institute of Technology, China. He obtained his Ph.D. degrees from both The Hong Kong Polytechnic University and Harbin Institute of Technology, China. His research interests include frosting mechanisms on cold surfaces, frosting characteristics on finned tube heat exchangers, and frosting and defrosting performances for air source heat pump systems. He has published more than 16 papers as in the heat and mass transfer field, including 10 as the lead/corresponding author.

1. Introduction
2. Freezing of sessile non-deformed water droplet under natural convection at early frosting stage in an ASHP unit
3. Freezing of sessile deformed water droplet under natural convection at early frosting stage in an ASHP unit
4. Frosting on surface of horizontal cold plate under natural convection in an ASHP unit
5. Frosting on surface of non-horizontal cold plate under natural convection in an ASHP unit
6. Frosting on surface of horizontal cold flat plate under forced convection in an ASHP unit
7. Measurement and calculation of frost characteristics on cold surfaces
8. Experimental study of frosting on surface of finned tube heat exchangers in an ASHP unit
9. Numerical study of frosting on surface of finned tube heat exchanger in an ASHP unit
10. Frosting on surface of micro-channel heat exchanger in an ASHP unit
11. Reverse cycle defrosting for multi-circuit outdoor coil in an ASHP unit
12. Conclusions and future work