An experimental investigation was conducted into the heat transfer characteristics during in-tube condensation of horizontal smooth, micro-fin, and herringbone tubes. The study focused on the heat transfer coefficients of refrigerants R-22, R-134a, and R-407C inside a series of typical horizontal smooth, micro-fin, and herringbone tubes at a representative average saturation temperature of . Mass fluxes ranged from 300 to , and vapor qualities ranged from 0.85 to 0.95 at condenser inlet, to 0.05 to 0.15 at condenser outlet. The herringbone tube results were compared with the smooth and micro-fin tube results. The average increase in the heat transfer coefficient of the herringbone tube, when compared with the smooth tube at comparable conditions, was found to be 322%, with maximum values reaching 336%. When compared with the micro-fin tube, the average increase in heat transfer coefficient was found to be 196%, with maximum values reaching 215%. Moreover, a new correlation was developed to predict the heat transfer coefficients in a herringbone and micro-fin tube. Semi-local heat transfer coefficients were calculated from the modified Wilson plot technique, using measurements of condenser subsection inlets and outlets, and from knowledge of the temperature gradient on the annulus side. The correlation predicted the semi-local heat transfer coefficients accurately, with 96% and 89% of the data points falling in the region for the herringbone tube and the micro-fin tube, respectively. The average heat transfer coefficients were accurately predicted, too, with all the data points for the herringbone tube and 83% of the data points for the micro-fin tube falling in the region. The derived heat transfer correlations can be used for design, especially for reversible heat pumps. This research proves that predicting the flow pattern during intermittent and annular flow is not a prerequisite for predicting the heat transfer accurately to within 20% of the measurements.
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Heat Transfer Performance During Condensation Inside Horizontal Smooth, Micro-Fin and Herringbone Tubes
Adriaan Lambrechts,
Adriaan Lambrechts
Master’s Degree Student
University of Johannesburg
, South Africa
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Leon Liebenberg,
Leon Liebenberg
Associate Professor
Department of Mechanical and Aeronautical Engineering,
e-mail: lieb@up.ac.za
University of Pretoria
, Pretoria 0002, South Africa
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Arthur E. Bergles,
Arthur E. Bergles
Glenn L. Martin Institute Professor
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Josua P. Meyer
Josua P. Meyer
Professor and Head
Department of Mechanical and Aeronautical Engineering,
e-mail: jmeyer@up.ac.za
University of Pretoria
, Pretoria 0002, South Africa
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Adriaan Lambrechts
Master’s Degree Student
University of Johannesburg
, South Africa
Leon Liebenberg
Associate Professor
Department of Mechanical and Aeronautical Engineering,
University of Pretoria
, Pretoria 0002, South Africae-mail: lieb@up.ac.za
Arthur E. Bergles
Glenn L. Martin Institute Professor
Josua P. Meyer
Professor and Head
Department of Mechanical and Aeronautical Engineering,
University of Pretoria
, Pretoria 0002, South Africae-mail: jmeyer@up.ac.za
J. Heat Transfer. Jul 2006, 128(7): 691-700 (10 pages)
Published Online: March 10, 2006
Article history
Received:
May 16, 2005
Revised:
March 10, 2006
Citation
Lambrechts, A., Liebenberg, L., Bergles, A. E., and Meyer, J. P. (March 10, 2006). "Heat Transfer Performance During Condensation Inside Horizontal Smooth, Micro-Fin and Herringbone Tubes." ASME. J. Heat Transfer. July 2006; 128(7): 691–700. https://doi.org/10.1115/1.2194038
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