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Energies 2017, 10(11), 1777; doi:10.3390/en10111777

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

1
Department of Nuclear and Energy Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea
2
School of Energy Systems Engineering, Chung-Ang University, Seoul 156-756, Korea
3
Department of Mechanical Engineering, Jeju National University, 66 Jejudaehakno, Jeju-si, Jeju 63243, Korea
*
Author to whom correspondence should be addressed.
Received: 12 August 2017 / Revised: 31 October 2017 / Accepted: 2 November 2017 / Published: 4 November 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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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. View Full-Text
Keywords: condensation; passive condenser system; vertical tube; annular fin condensation; passive condenser system; vertical tube; annular fin
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MDPI and ACS Style

Jang, Y.-J.; Choi, D.-J.; Kim, S.; Hyun, M.-T.; Lee, Y.-G. Enhancement of Condensation Heat Transfer Rate of the Air-Steam Mixture on a Passive Condenser System Using Annular Fins. Energies 2017, 10, 1777.

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