Heat transfer to sub-cooled binary solution in horizontal tube

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dc.contributor.author Orian, G.
dc.contributor.author Jelinek, M.
dc.contributor.author Levy, A.
dc.date.accessioned 2014-12-15T08:32:39Z
dc.date.available 2014-12-15T08:32:39Z
dc.date.issued 2007
dc.description.abstract Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007. en_ZA
dc.description.abstract Predicted heat transfer coefficients (HTC) are widely used for calculations of various heat transfer processes. Various empirical and semi-empirical models of non-dimensional groups are used for calculating the heat transfer coefficients. The common accuracy of the predicted heat transfer coefficient is usually about ±25%; however, the accuracy is failing by the inaccurate predictions of the fluid properties. In the present study the heat transfer coefficient of subcooled organic mixture chlorodifluoromethane (R22) - dimethylacetamide (DMAC) were predicted. While the solution’s pressure-temperature-concentration, densitytemperature- concentration and viscosity-temperatureconcentration relations were previously measured in our laboratory and the heat capacity were calculated from the enthalpy of the solution, the only unknown property that was required for predicting the HTC was the mixture thermal conductivity. Various correlations and mixing rules for the mixture thermal conductivity were adopted for predicting the heat transfer coefficient. In order to validate the predicted heat transfer coefficients, an experimental system was designed, built and successfully operated. The heat transfer coefficient was measured experimentally and compared with the predicted one. Based on this comparison the best fitted thermal conductivity for the working fluid (R22-DMAC) is recommended. As a result, the deviations of the predicted heat transfer coefficients, obtained by the well-known Dittus-Boelter equation, from the experimental values were less than 15%. en_ZA
dc.description.librarian cs2014 en_ZA
dc.format.extent 6 pages en_ZA
dc.format.medium PDF en_ZA
dc.identifier.citation Orian, G, Jelinek, M & Levy, A 2007, Heat transfer to sub-cooled binary solution in horizontal tube, Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007. en_ZA
dc.identifier.isbn 9781868546435
dc.identifier.uri http://hdl.handle.net/2263/43056
dc.language.iso en en_ZA
dc.publisher International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics en_ZA
dc.relation.ispartof HEFAT 2007
dc.rights University of Pretoria en_ZA
dc.rights.uri University of Pretoria en_US
dc.subject Predicted heat transfer coefficients en_ZA
dc.subject Heat transfer processes en_ZA
dc.subject Empirical and semi-empirical models en_ZA
dc.subject Subcooled organic mixture chlorodifluoromethane en_ZA
dc.subject Dimethylacetamide en_ZA
dc.subject Dittus-Boelter equation en_ZA
dc.title Heat transfer to sub-cooled binary solution in horizontal tube en_ZA
dc.type Presentation en_ZA


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