Defrosting for Air Source Heat Pump - 1st Edition - ISBN: 9780081025178

Defrosting for Air Source Heat Pump

1st Edition

Research, Analysis and Methods

Authors: Song Mengjie Shi-MIng Deng
Paperback ISBN: 9780081025178
Imprint: Woodhead Publishing
Published Date: 1st February 2019
Page Count: 310
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Table of Contents

1. Introduction
2. Frosting and defrosting methods
3. Uneven defrosting
4. Frosting evenness value
5. Refrigerant distribution
6. Indoor thermal comfort during defrosting
7. PCM-TES reverse cycle defrosting
8. Defrosting process control
9. Non-frosting ASHP unit
10. Techno-economic performance
11. Conclusions and future work


Defrosting for Air Source Heat Pumps (ASHP) presents a detailed analysis of the methods, processes and problems faced of defrosting, a necessary requirement to maintain the performance of ASHP units. A series of experimental and numerical studies are presented by Dr. Mengjie and Professor Shiming and their team of expert contributors, to help the reader gain a deep understanding of control strategies and system design optimization methods to improve the performance and reliability of units.

Defrosting for Air Source Heat Pumps discusses the most recent experimental and numerical studies of reverse cycle defrosting; the most widely used defrosting method for ASHP, and includes both frosting and defrosting performance improvement strategies. Techno-economic considerations are also analyzed, as well as a detailed discussion on the outlook for the future.

This book is a valuable resource to research students and academics of thermal energy and mechanical engineering, especially those focusing on defrosting for ASHP, heating and ventilation and energy efficiency, as well as engineers and professionals engaged in the development and management of heat pump machinery.

Key Features

  • Includes MatLab codes to allow the reader to implement the knowledge they have acquired in their own simulations and projects
  • Discusses experimental and numerical studies to provide a well-rounded analysis of technologies, methods and systems available
  • Presents techno-economic considerations and a look to the future


Research students, engineers, academics and researchers of mechanical and thermal energy engineering, especially focusing on defrosting for ASHP, heating, ventilation, air conditioning, energy recovery, energy efficient buildings. The engineers will likely be engaged in heat pump machinery and energy efficiency


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© Woodhead Publishing 2019
Woodhead Publishing
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About the Authors

Song Mengjie Author

Dr. Song is a lecturer at the Department of Energy Engineering at the Guangdong University of Technology (GDUT). He received his Bachelor degree from Hunan University, Master degree from Harbin Institute of Technology, and Ph.D. in Building Services Engineering from the Hong Kong Polytechnic University in 2014, respectively. His research interests include frosting and defrosting for ASHP unit, indoor thermal comfort, thermal characteristic stability of PCMs, and fin surface treatment for heat transfer enhancement. On the topic of frosting and defrosting for ASHP unit, he had nearly 8 years’ research experience, and defined series of phenomenon, such as uneven frosting, even frosting, frosting evenness value, uneven defrosting, even frosting, and defrosting evenness value. As a young scholar, he had published more than 10 SCI papers as first author, and applied more than 10 patents in the heat transfer field.

Affiliations and Expertise

Associate Professor, Department of Energy Engineering, School of Material and Energy, Guangdong University of Technology, China

Shi-MIng Deng Author

Professor Deng Shi-Ming obtained his PhD in 1991 in Air Conditioning and Refrigeration Engineering from South Bank Polytechnic, London, UK, where teaching and research activities in building services engineering were at leading position at that time. He joined The Hong Kong Polytechnic University as a lecturer in 1992 and is now a Professor and an associate head of Department of Building Services Engineering. He is now a fellow of The Hong Kong Institution of Engineers (HKIE), and a member of American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE). Professor Deng's research interests include: direct expansion (DX) air conditioning and refrigeration system simulation and control strategies development; applying air conditioning and thermal comfort in sleeping environment in tropics or subtropics; building energy use performance analysis including building energy audit and benchmarking (in particular for hotel buildings). Professor Deng has published totally over 120 journal and conference papers. In addition, based on extensive research experiences, Professor Deng has carried out a number of high-level consultancy projects related to building energy audits, HVAC systems performance evaluation and optimization, and thermal modeling study of the thermal environment in a computer server room.

Affiliations and Expertise

Professor, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong