내부핀이 부착된 관내 응축열전달 특성에 관한 연구

An experiment was carried out to evaluate the heat transfer and pressure drop performance of a smooth tube and an internally-finned tube using R-113 under horizontal condensation conditions. The test tube is 13.88(㎜) in diameter and 3.2(m) long. Five different inlet pressures of 0.13. 0.16, 0.18, 0.21 and 0.23 (㎫) were employed and the mass flux was varied from 82 to 256(㎏/㎡s). The results showed that the heat transfer coefficient for the internally-finned tube were enhanced by approximately 130~180(%) over that for the smooth tube. The increase in pressure drop for the internally-finned tube were reached up to 1100~1600(%) over that for the smooth tube.