대칭 사다리꼴 핀과 비대칭 사다리꼴 핀의 성능 비교

Abstract

Abstract : Heat loss and fin efficiency of symmetric and asymmetric trapezoidal fins with variable slope of fin's top surface are obtained by using a two-dimensional analytic method. Shapes of symmetric and asymmetric fins are changed from rectangular through trapezoidal to triangular by adjusting the fin shape factor. The ratio of symmetric trapezoidal fin length to asymmetric trapezoidal fin length is presented as a function of fin base height and convection characteristic number. The ratio of symmetric trapezoidal fin efficiency to asymmetric trapezoidal fin efficiency is presented as a function of the fin base height and fin shape factor. One of results shows that asymmetric trapezoidal fin length is shorter than symmetric trapezoidal fin length (i.e., asymmetric trapezoidal fin volume is smaller than symmetric trapezoidal fin volume) for the same heat loss when the fin base height and fin shape factor are the same. Key words : Symmetric trapezoidal fin(대칭 사다리꼴 핀), Asymmetric trapezoidal fin(비대칭 사다리꼴 핀), Convection characteristic number(대류특성계수), Fin shape factor(핀 형상계수), Fin efficiency(핀 효율)