Necdet ALTUNTOP1, Mevlut ARSLAN1, Veysel OZCEYHAN1,

1 Dept. of Mechanical Engineering, Erciyes University, 38039 Kayseri, Turkey

Abstract

In this work, the numerical analysis of the effects of using different obstacles into the thermal stratifications in the cylindrical hot water storage tank has been presented. This kind of storage tank is widely used in heating systems by solar energy. The heat transfer is carried out by natural convections in the tank. The water is used as fluid. The Optimal shape and angle of the obstacle has been found to obtain higher thermal stratification as possible as between cold and hot water between 30 different obstacles. The natural convection effect into the temperature distribution inside the tank has also obtained for different obstacle types and angles. The temperatures of the water entering to the collector and from the collector and water exiting form the tank to usage have been presented into the graph. The temperature differences of these waters have also presented to determine thermal stratification according to the obstacle types and angles. The temperature distributions in the tank between with and without obstacle have been analyzed to compare to get high thermal stratification. At the conclusion, It is found that the obstacle type 11 has supplied the highest thermal stratification between all investigated cases.