This book is the thesis of my PhD work which consists of analysis of shell and tube heat exchangers with different optimization techniques.This book is used a reference to scholars for their research work for comparison of results like heat transfer rate, enhancement factor, output temperature etc. This book consists of comparison of results with a real power plant data and the research work got better results.In this work the shell and tube heat exchanger used KGMO method, modified KGMO method and TLBO methods are used for analysis.The geothermal fluid is used for heat transfer with the refrigerants for heat generation.