The rising cost of electricity, the limited sources of fossil fuels and the strong need to reduce thermal pollution led to growing interest in heat recovery technology. The further utilization of waste heat will save the available energy sources, help to prevent the environment from thermal pollution and maximize work output. Recently, research efforts based on realizing maximum energy utilization produced combined cycles technology which was accepted worldwide due to high performance. In this book a hybrid thermal system has been introduced as an attempt to improve the combined cycle technology with the object of utilizing effectively the amount of heat energy liberated from a fixed amount of burnt fuel for power production and cooling. The suggested hybrid thermal system has been constructed from Brayton, inverse Brayton and Absorption cycles aiming to augment the power output by taking the expansion process below atmospheric and using the rejected exhaust gases to power an absorption unit to produce cooling. The results reported in this book provide a clear insight into the performance of the proposed hybrid system.