Browsing by Author "Lu, D. C."

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Experimental study of forced convective boiling for non-azeotropic refrigerant mixtures R-22/R-124 in horizontal smooth tube
(2009-06-01)
Chiou, C. B.
;
Lu, D. C.
;
Liao, C. Y.
;
Su, Y. Y.
;
機械工程學系
In this article, the experiment is carried out with four stages of test section and new experimental data of non-azeotropic refrigerant mixtures R-22/R-124 are presented. Existing correlations are analysed and new ones are proposed for pure refrigerants. The nucleate boiling correlation of the refrigerant mixtures is modified so as to obtain the evaporation heat transfer coefficient of the refrigerant mixtures in a smooth tube. The result shows that the majority of the predictions fall within +/- 30% of the experiments. (c) 2008 Elsevier Ltd. All rights reserved.
Heat transfer correlations of forced convective boiling for pure refrigerants in micro-fin tubes
(2011-04-01)
Chiou, C. B.
;
Lu, D. C.
;
Chen, C. C.
;
Chu, C. M.
;
機械工程學系
The evaporation heat transfer coefficient of pure refrigerants R-22 and R-124 in micro-fin tubes were measured at the reduced pressure of 0.15, the mass flux from 100 to 400 kg/m(2) s, the flow quality from 0.1 to 0.9, and the heat flux from 5 to 20 kW/m(2). The evaporation heat transfer coefficient of pure refrigerant in micro-fin tube is 1.5-3.0 times higher than that of smooth tube. In this article, the single phase forced convection heat transfer coefficient of micro-fin tube is introduced to predict the evaporation heat transfer coefficient of pure refrigerant in micro-fin tubes. The present correlations provide reasonable agreement with the experimental data. The prediction values mostly fall within +/- 30%. (C) 2010 Elsevier Ltd. All rights reserved.