The effect of heat transfer additive and surface roughness of micro-scale hatched tubes on absorption performance |
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Authors: | Chan Woo Park Hyun Churl Cho Yong Tae Kang |
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Affiliation: | a Machinery Research Lab. LG Cable Ltd., Kyung-Gi 431-080, South Korea;b School of Mechanical and Industrial Systems Engineering, Kyung Hee University, Kyung-gi, 449-701, South Korea |
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Abstract: | The objectives of this paper are to investigate the effect of heat transfer additive and surface roughness of micro-scale hatched tubes on the absorption performance and to provide a guideline for the absorber design. Two different micro-scale hatched tubes and a bare tube are tested to quantify the effect of the surface roughness on the absorption performance. The roughness of the micro-scale hatched tubes ranges 0.39–6.97 μm. The working fluid is H2O/LiBr solution with inlet concentration of 55, 58 and 61 wt.% of LiBr. Normal Octanol is used as the heat transfer additive with the concentration of 400 ppm. The absorber heat exchanger consists of 24 horizontal tubes in a column, liquid distributor at the liquid inlet and the liquid reservoir at the bottom of the absorber. The effect of heat transfer additive on the heat transfer rate is found to be more significant in the bare tube than that in the micro-scale hatched tubes. It is found that the absorption performance for the micro-hatched tube with heat transfer additive becomes up to 4.5 times higher than that for the bare tube without heat transfer additive. It is concluded that the heat transfer enhancement by the heat transfer additive is more significant than that by the micro-scale surface treatment. |
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Keywords: | Absorption system Water-lithium bromide Absorber Tube Enhanced surface Additive Roughness Heat transfer Mass transfer ExperimentSystè me à absorption Eau-bromure de lithium Absorbeur Tube Surface augmenté e Additif Rugosité Transfert de chaleur Transfert de masse Expé rimentation |
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