The purpose of this book is go to through the main topics address a number of experimental studies on Design and Improvement of Cross-Flow Heat Exchanger Using Integral Fins with Nanofluid as well as this book included many of studies which used Cross Flow Heat Exchanger Using Integral Fins, moreover used nanofluids in this experimental study as well as Preparation of Nanofluids with Ultrasonic Cleaner Device and Agitated Device as well as the theoretical and experimental part for presented work by authors for this book.