쉘-튜브 열교환기의 배플 경사각과 압력 및 열교환 효율의 상관성에 관한 수치해석적 연구

Abstract

The shell-and-tube heat exchanger is a heat exchanger that is widely used throughout the industry because it has the advantage of being easy to manufacture and install. The baffle installed inside the heat exchanger serves to improve heat transfer by supporting the tube and generating a vortex. In the case of a general segmental baffle, the heat transfer efficiency is high, but there is a problem that the pressure drop increases. In this study, numerical analysis was conducted to increase the heat transfer efficiency and reduce the pressure drop by locally changing the angle of the segmental baffle. The angle variables of the baffle were 0°, 15°, and 30°, and the research was conducted by setting the direction variables to FD (Forward direction) and BD (Backward direction). When the angle of the baffle is changed, the pressure drop inside the shell is reduced because the main flow flows along the curved surface of the baffle, and the pressure drop is reduced by up to 14.1%. In addition, the heat transfer efficiency is increased by increasing the strength of the eddy current. The overall performance of the heat exchanger was analyzed through thermal enhancement factor (TEF), and the efficiency was highest at BD 30°.