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잠열축열시스템의 축열과정에서 핀에 의한 열전달 촉진 특성

Heat Transfer Enhancement by Fins during Heat Storage Stage in a Latent Heat Storage System

HWAHAK KONGHAK, October 1997, 35(5), 755-761(7), NONE
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Abstract

망초와 파라핀왁스를 잠열축열재로 하여 환형 핀이 부착된 전열관을 통한 잠열축열시스템의 축열과정에서의 열전달 특성을 살펴보았다. 실험에 사용된 축열조는 높이가 530 ㎜, 직경이 74 ㎜이고 축열조 중앙부에 삽입된 열전달관은 높이가 480 ㎜, 직경이 13.5 ㎜인 이중관으로 되어 있으며, 열전달 유체로는 물을 사용하였다. 축열재로 열을 저장하는 축열과정에서 파라핀왁스의 경우에는 고체와 액체간의 상 전이에 따른 밀도 차이가 커서 전도 및 자연대류에 의해 열전달이 이루어지는데 반하여 망초의 경우에는 주로 전도에 의하여 열전달이 이루어짐을 알 수 있었다. 핀에 의한 열전달 촉진은 얇은 핀의 경우에는 그다지 효과가 크지 않은데 반하여 두꺼운 핀의 경우에는 뚜렷한 열전달 촉진현상을 볼 수 있었으며 파라핀왁스의 경우에서 핀에 의한 열전달 촉진의 경향이 크게 나타났다. 실험에서 얻어진 축열과정에서의 열전달계수는 망초의 경우에는 80-180 W/㎡K, 파라핀왁스의 경우에는 50-180 W/㎡K 이었다.
Heat transfer characteristics of a low temperature latent heat storage system during the heat storage stage was examined for the circular finned tubes using Na2SO4·10H2O and paraffin wax as phase change materials. The heat storage vessel has the dimension of 530mm height, 74mm inside diameter and inner heat transfer tube is 480mm in height and 13.5mm outside diameter. Hot water was employed as the heat transfer fluid. During the heat storage stage, conduction was the major heat transfer mechanism for the Na2SO4·10H2O, while both conduction and natural convection were the major heat transfer mechanism for the paraffin wax. The heat transfer enhancement by fins over the unfinned heat transfer tube was negligible with the thin finned tube system whereas the enhancement by the thick finned tube was significant. The experimentally determined overall heat transfer coefficients for Na2SO4·10H2O and paraffin wax were in the range of 80-180W/m2K and 50-180W/m2K respectively.

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