Experimental correlation of falling film absorption heat transfer on micro-scale hatched tubes |
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Authors: | Chan Woo Park Sung Soo Kim 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 surface roughness of micro-hatching tubes on the absorption performance and to develop an experimental correlation of Nusselt number as a function of the roughness. 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 0.386–11.359 μm. The working fluid is H2O/LiBr solution with inlet concentration of 55, 58 and 61 wt.% of LiBr. 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. It was found that absorption performance of micro-hatching tubes was improved up to two times compared with the bare tube. An experimental correlation of Nusselt number was developed as a function of the film Reynolds number and the roughness with an error band of ±25%. |
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Keywords: | Absorption Heat transfer falling film Hatched tube ExperimentAbsorption Transfert de chaleur Film tombant Tube à nervures Expé rimentation |
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