State-of-the-art review on crystallization control technologies for water/LiBr absorption heat pumps |
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Authors: | Kai Wang Omar AbdelazizPadmaja Kisari Edward A Vineyard |
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Affiliation: | Building Equipment Research Group, Energy & Transportation Science Division, Oak Ridge National Laboratory, One Bethel Valley Road, P.O. Box 2008, MS-6067, Oak Ridge, TN 37831-6067, USA |
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Abstract: | The key technical barrier to using water/lithium bromide (LiBr) as the working fluid in air-cooled absorption chillers and absorption heat-pump systems is the risk of crystallization when the absorber temperature rises at fixed evaporating pressure. This article reviews various crystallization control technologies available to resolve this problem: chemical inhibitors, heat and mass transfer enhancement methods, thermodynamic cycle modifications, and absorption system-control strategies. Other approaches, such as boosting absorber pressure and J-tube technology, are reviewed as well. This review can help guide future efforts to develop water/LiBr air-cooled absorption chillers and absorption heat-pump systems. |
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Keywords: | Absorption system Heat pump Lithium bromide Crystallization Control |
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