응축형 가스보일러 연소기의 연소특성 및 열교환기의 열전달특성에 관한 수치적 연구

The Numerical Study on the Cobustion Characteristics and the Heat Transfer Characteristics of Heat Exchanger for Condensing Gas Boiler

It was numerically studied that characteristics of fluid flow and heat transfer in a tube with disk and annular baffle for heat exchanger of condensing boiler. Using a finite volume technique and CFD code, STAR-CD, the governing equations were solved and the temperature and flow fields were investigated. The interval between tube and annular baffle, height and diameter of baffle were selected as important design parameters, and the effects of these parameters on heat transfer and fluid flow were studied. As a result, in the case of with interval, the pressure was decreased but heat transfer was increased. Also heat transfer was slowly increased as the size of disk and annular baffle were increased and the distance between baffles were decreased.