This book includes selected peer-reviewed articles from the International Conference on Sustainable Energy Technology; ICSET 2023 held at the Industrial University of Ho Chi Minh City, Vietnam, with a focus on the theme “Sustainable Energy Technologies in the Fourth Industrial Revolution.” Topics refer to heat and refrigeration engineering including heat transfer and heat exchanger, energy saving and efficient use of energy, energy safety, sustainable energy development and environmental protection, new energy and renewable energy, techniques for drying and preserving agricultural and food products, boilers and heat network, gasification, pyrolysis technology, air conditioning and ventilation, refrigeration equipment, computational fluid dynamics, computational intelligence in renewable energy, optimization in electrical–electronics systems, advanced manufacturing technologies, robotics and mechatronics, automotive engineering. The book not only provides an awareness on the vital importance of sustainability in technologies, economics, education and countries' development but also highlights the essential roles of technological innovations in attaining sustainable development. It provides an international platform for researchers, practitioners, policymakers and entrepreneurs to present recent advances and to exchange knowledge and experience on various topics related to the theme of sustainable energy technology in the fourth industrial revolution.