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Journal of Enhanced Heat Transfer

Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

Institutional price:	$577.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2004, Volume11

232 pages

DOI: 10.1615/JEnhHeatTransf.v11.i4

Issue price - $138.00

Performance Evaluation of Deep Spirally Corrugated Tubes for Shell-and-Tube Heat Exchangers

Ventsislav D. Zimparov
Gabrovo Technical University, 4, H. Dimitar Str., 5300 Gabrovo, Bulgaria

Plamen J. Penchev
Gabrovo Technical University, 4, H. Dimitar Str., 5300 Gabrovo, Bulgaria

ABSTRACT

Extended performance evaluation criteria have been used to assess the benefit of replacing the smooth tubes with deep corrugated tubes in shell-and-tube heat exchangers. The goal is to assess the influence of characteristic parameters of the corrugated tubes—height-to-diameter ratio e/D_i, relative pitch p/e, and relative helix angle β_*—on the thermodynamic efficiency in the case of condensers with steam condensing on the outside of the vertically or horizontally mounted tubes and water in forced convection (nonboiling) flow through the tubes. The geometrical parameters of the tubes studied were in the range of e/D_i = 0.05÷0.10; p/e = 5.4÷13.9; and β_* = 0.33÷0.63 for vertically mounted tubes and e/D_i = 0.05÷0.07; p/e = 4.6÷18.2; and β_* = 0.40÷0.94 for horizontally established ones. Extended performance evaluation criteria have been used to assess the benefit of tubes. The thermodynamic optimum can be defined by minimizing the entropy generation number compared with the relative increase of the heat transfer rate or relative reduction of the heat transfer area.