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Heat transfer performance during in-tube condensation in horizontal smooth, micro-fin and herringbone tubes

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dc.contributor.advisor Dr. L. Liebenberg en
dc.contributor.author Lambrechts, Adriaan
dc.date.accessioned 2008-11-27T07:26:46Z
dc.date.available 2008-11-27T07:26:46Z
dc.date.issued 2008-11-27T07:26:46Z
dc.date.submitted 2003-05
dc.identifier.uri http://hdl.handle.net/10210/1753
dc.description M.Ing. en
dc.description.abstract An experimental investigation was conducted into the heat transfer characteristics of horizontal smooth, micro-fin and herringbone tubes during in-tube condensation. The study focused on the heat transfer coefficients of refrigerants R-22, R-134a and R-407C inside the three tubes. The herringbone tube results were compared to the smooth and micro-fin tube results. The average increase in the heat transfer coefficient when compared to the smooth tube was found to be as high as 322% with maximum values reaching 336%. When compared to the micro-fin tube, the average increase in heat transfer coefficient was found to be as high as 196% with maximum values reaching 215%. A new unified correlation was also developed to predict the heat transfer coefficients in a herringbone and micro-fin tube. The correlation predicted the semi-local heat transfer coefficients accurately with 96% and 89% of the data points falling in the ± 20% region for the herringbone and micro-fin tube respectively. The average heat transfer coefficients were also accurately predicted with all the data points for the herringbone tube and 83% of the data points for the micro-fin tube falling in the ± 20% region. The trend of the new correlation also fitted the data accurately and the conclusion was made that the correlation is accurate and could be used successfully in practice. en
dc.language.iso en en
dc.subject Heat transmission en
dc.subject Condensation en
dc.subject Refrigerants en
dc.title Heat transfer performance during in-tube condensation in horizontal smooth, micro-fin and herringbone tubes en
dc.type Thesis en


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