Investigation of the Effect of Using Fe + Pure Water Nanofluid on Thermal Performance in a Two Phase Closed Thermosyphon

Heat is a type of energy that is used in many applications and can be easily converted into other types of energy. In this study, a performance analysis was carried out by using Fe + Pure water nanofluid in place of pure water in a two phase closed thermosyphon, which has a wide place in practice due to its simple structure. In the study, a copper thermosyphon with a length of 1 m, diameter of 14 mm and wall thickness of 1 mm was used. Experiments were performed with both pure water and nanofluid to make a comparison. To observe the performance of system in different operating conditions, the experiments were carried out at 3 different heating power (150, 300, 450 W) and 3 different coolant flow rates (3, 6, 9 g/s). In all experimental conditions, Fe + Pure water nanofluid had better results than pure water. The highest efficiency value was found to be 77.9% in the experiment using Fe + Pure water nanofluid, performed at 150 W power and 9 g/s water flow rate. When pure water was used in this experiment, the efficiency value was obtained as 67.7% and the improvement rate was 15%. The highest improvement rate was obtained as 50.3% in the experiment conducted at 450 W heating power and 3 g/s coolant flow rate. The use of nanofluid has also reduced the thermal resistance of the thermosyphon. The highest rate of decrease in thermal resistances was obtained as 56.7% in the experiment performed at 150 W heating power and 3 g/s coolant flow rate. Keywords