Enhancement of Condensation Heat Transfer Rate of the Air-Steam Mixture on a Passive Condenser System Using Annular Fins

Yeong-Jun Jang, Dong-Jae Choi, Sin Kim, Myung-Taek Hyun and Yeon-Gun Lee
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Yeong-Jun Jang: Department of Nuclear and Energy Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea
Dong-Jae Choi: Department of Nuclear and Energy Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea
Sin Kim: School of Energy Systems Engineering, Chung-Ang University, Seoul 156-756, Korea
Myung-Taek Hyun: Department of Mechanical Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea
Yeon-Gun Lee: Department of Nuclear and Energy Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea

Energies, 2017, vol. 10, issue 11, 1-15

Abstract: This paper presents an experimental investigation on the enhancement of the heat transfer rate of steam condensation on the external surfaces of a vertical tube with annular fins. A cylindrical condenser tube, which is 40 mm in outer diameter and 1000 mm in length, with annular disks of uniform cross-sectional area is fabricated in the manner of ensuring perfect contact between the base surface and fins. A total of 13 annular fins of 80 mm diameter were installed along the tube height in order to increase the effective heat transfer area by 85%. Through a series of condensation tests for the air-steam mixture under natural convection conditions, the heat transfer data was measured in the pressure range of between 2 and 5 bar, and the air mass fraction from 0.3 to 0.7. The rates of heat transfer of the finned tube are compared to those that are measured on a bare tube to demonstrate the enhanced performance by extended surfaces. In addition, based on the experimental results and the characteristics of steam condensation, the applicability of finned tubes to a large condenser system with a bundle layout is evaluated.

Keywords: condensation; passive condenser system; vertical tube; annular fin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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