| Summary: | Energy conversion technologies, where waste heat recovery systems are
included, have received significant attention in recent years due to reasons that include
depletion of fossil fuel, increasing oil prices, changes in climatic conditions, and global
warming. For low temperature applications, there are many sources of thermal waste
heat, and several recovery systems and potential useful applications have been proposed
by researchers [1-4]. In addition, many types of equipment are used to recover waste
thermal energy from different systems at low, medium, and high temperature
applications, such as heat exchangers, waste heat recovery boiler, thermo-electric
generators, and recuperators. In this paper, the focus is on waste heat recovery from air
conditioners, and an efficient application of these energy resources. Integration of solar
energy with heat pump technologies and major factors that affect the feasibility of heat
recovery systems have been studied and reviewed as well.
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