Experimental study on condensation heat transfer characteristics of special heat transfer tubes = 응축용 특수 전열관의 열전달 특성에 관한 연구

다국어 초록 (Multilingual Abstract)

In this study, condensation heat transfer characteristics were conducted with special heat transfer tubes of SH-C type. Experiments were carried out the saturated vapor temperature of 334K and the wall subcooling of 1.5-4.5K. The refrigerant was R-113 and the enhanced tubes used in the present study were SH-CDR, SH-CYR and SH-CHR. The experimental results showed that the condensation heat transfer coefficients of SH-C type tubes were about 23-66% higher than those of a low integral-fin tube. It was visualized that the condensed liquid on the outer surface of SH-C type tubes flowed continuously down unlike a low integral-fin tube and a plain tube, due to a 3-D extending fin on the outer surface of SH-C type tubes. As a result, the thermal resistance of the condensed liquid decreased and the heat transfer coefficient increased. Also, the enhancement ratio of SH-CDR tube was the highest, and it was about 9-11 times as compared to that of a plain tube.

목차 (Table of Contents)

• 1. 서론
• 2. 실험장치 및 방법
• 2.1 실험장치
• 2.2 실험방법
• 2.3 실험데이터 계산
• 3. 실험결과 및 고찰
• 4. 결론
• 참고문헌