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Technical Briefs

Critical Analysis of the Available Ammonia Horizontal In-Tube Flow Boiling Heat Transfer Correlations for Liquid Overfeed Evaporators

[+] Author and Article Information
N. Ablanque, J. Rigola, C. Oliet, J. Castro

Centre Tecnològic de Transferència de Calor (CTTC), Universitat Politècnica de Catalunya (UPC), Colom 11, 08222 Terrassa (Barcelona), Spain

J. Heat Transfer 130(3), 034502 (Mar 06, 2008) (5 pages) doi:10.1115/1.2804933 History: Received June 16, 2006; Revised June 22, 2007; Published March 06, 2008

The aim of this work is to present a critical examination of both the available experimental data and the performance of the available heat transfer correlations for oil-free ammonia horizontal in-tube boiling at fin-and-tube-type air-to-refrigerant liquid overfeed evaporation conditions. First, a selection and comparison of the experimental database found in the open literature at the mentioned working conditions is presented. Subsequently, after a short description of the most relevant heat transfer correlations, and in accordance with the selected data, a detailed analysis of the performance of each correlation is carried out. Results show an important divergence between the experimental data sets and conclude that the presently available correlations show considerable discrepancies in heat transfer coefficients within the selected conditions.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

Grahic Jump Location
Figure 1

(a) Selected test measurements plotted against heat fluxes and (b) two specific tests plotted against vapor weight fraction

Grahic Jump Location
Figure 2

Comparison of Gungor and Winterton (9) and Thome (12) correlations to experimental data

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