질량유량 변화에 따른 실물 크기 원통다관식 열교환기의 열전달 성능 평가

Abstract

In this paper, a realizable k-ε turbulence model was used to analyze the mutual heat transfer of a full-scale three-dimensional shell and tube heat exchanger (STHEX) with a heat exchange length of 2,000 ㎜ when the mass flowrate flowing to the shell and the tube is changed into five types. The amount of heat lost from the shell and the amount of heat gained from the tube are almost identical when the mass flowrate of the shell and the tube increases, respectively, and are distributed non-linearly. In addition, the overall heat transfer coefficient increases non-linearly as the mass flowrate of the shell and the tube increases; it shows a value of about 420~670W/㎡·℃ at a given mass flowrate. On the other hand, it is judged that various approximation equations such as heat transfer amount can be important data that provide a lot of information in response to changes in the mass flowrate of the shell and the tube.