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http://dx.doi.org/10.5762/KAIS.2012.13.4.1440

Effect of the lubrication oil on heat transfer and pressure drop characteristics of supercritical carbon dioxide in a microfin tube  

Ku, Hak-Keun (Department of refrigeration and air-conditioning engineering, Tongmyong University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.13, no.4, 2012 , pp. 1440-1446 More about this Journal
Abstract
This paper presents an experimental study of heat transfer and pressure drop characteristics of supercritical carbon dioxide with PAG inside a horizontal microfin tube. Heat transfer coefficient and pressure drop gradients were measured at 10 MPa in pressure and 520 kg/$m^2s$ in mass flux with variation of PAG mass concentration from 0.06% to 2.26%. The tendencies of both heat transfer and frictional pressure drop characteristics show the same as those of pure $CO_2$ up to 0.3% in PAG mass concentration. In case of 2.26% in PAG mass concentration, measured heat transfer coefficients showed 50% lower than those of pure $CO_2$ near the pseudocritical temperature and measured frictional pressure drop gradients show 1.6 times higher in comparison with those of pure $CO_2$ at $60^{\circ}C$ in $CO_2$ bulk temperature.
Keywords
Carbon dioxide; Heat transfer coefficient; Gas cooler; Supercritical pressure; Microfin tube; Lubrication oil; PAG(Poly Alkylen Glycol);
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