This book, titled Advances in Energy Recovery and Efficiency Technologies, presents and covers unique and interesting topics related to advances and innovations in energy recovery and energy efficiency technologies. It is the result of contributions from a number of researchers and experts worldwide. Energy recovery and efficiency technologies and methods aim to decrease energy wasted or unutilized in various energy conversion processes, ultimately reducing the required energy input (fuel) and improving the overall energy efficiency of systems and energy conservation of natural energy resources. These technologies, once efficiently designed and their performances are optimized, will potentially improve the economics and sustainability of systems, as well as reduce their emissions, air pollution, and thermal energy waste discharged to the environment. It is hoped that the book will become a valuable source of information and a basis for extended research for researchers, academicians, policymakers, and practitioners in the area of energy recovery and energy efficiency technologies.