The book presents select proceedings of the International Conference on Mechanical Engineering (INCOME 2021). It presents the topics related to thermal and fluid mechanics including various sources of energy. The topics covered include theoretical and practical aspects of thermal and fluid systems and thermal design of the related equipment. The book also includes latest topics such as solar energy, computational techniques, enhancement of energy storage capacity, fluid solid interaction, and hybrid energy systems. The book will be a valuable reference for beginners, researchers, and professionals interested in research, design and development in thermal and fluid sciences.