Abstract: “In recent century due to technological advances and population have increased energy demand. Energy save and energy use efficiency has become important topic. Energy production, transmission process is related to heat transfer. When the heat transfer is enhancing at energy process, energy efficiency will increase. The heat transfer enhancement techniques are widely used in many applications in the heating process. These techniques are classified as active and passive techniques. The objective of this study is to increase heat transfer efficiencies in tube with passive techniques. For this purpose, various apparatus will place into inner tubes which increase the heat transfer surfaces. The experiments were performed with 3 different type apparatus. It was compare and analyzed efficiency of apparatus types.”

Keywords: Heat Transfer, Heat Exchanger, Energy Efficiency