期刊
RENEWABLE ENERGY
卷 187, 期 -, 页码 109-122出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2022.01.052
关键词
Absorption refrigeration system; Membrane-based absorber; Heat and mass transfer; Enhancement structure; Absorption rate; Pressure drop
资金
- Shenzhen Science and Tech-nology Innovation Committee [JSGG20191129144405934]
- Research Grants Council of Hong Kong [CityU 11212620, CityU 21201119, CityU 11215621]
- Key Laboratory of Renewable Energy, Chinese Academy of Sciences [E029kf0701]
- City University of Hong Kong [9610408]
This study proposes novel enhancement structures to improve the absorption characteristics of flat membrane-based absorbers. Through parameter studies and comparative analysis, it is recommended to use inclined groove (IG) and herringbone groove (HG) structures for enhanced absorption performance.
Novel and simple enhancement structures are proposed to improve the absorption characteristics of flat membrane-based absorbers. Firstly, a parametric study is conducted to elucidate the effect of membrane parameters on the absorption process using a two-dimensional CFD model. Results indicate that the most critical membrane parameter affecting the absorption rate is the membrane porosity compared with the membrane thickness and pore diameter. The recommended membrane porosity, pore diameter, and thickness are 0.8, 1 mu m, and 60 mu m, respectively. Then, a comparative study on the proposed enhancement structures is carried out. Results demonstrate that inclined groove induces solution swirling while increasing the effective heat transfer areas, and thus the absorption performance is significantly improved at lower solution pressure drops. Flow visualization shows that two counter rotating vortices are generated inside HG (herringbone groove) and SHG (staggered herringbone grove) structures, and the longitudinal swirling flows are induced inside IG (inclined groove) and SIG (staggered inclined groove) structures. Comparisons indicate that the HG structure improves the absorption rate by 1.62 times, reducing the solution pressure drop by 19.01%. These changes from the IG structure are 1.56 and 20.77%, respectively. Therefore, the IG and HG structures are recommended. (c) 2022 Elsevier Ltd. All rights reserved.
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