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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

THERMODYNAMIC ANALYSIS OF A MEMBRANE-BASED LIQUID DESICCANT SYSTEM WITH A RANDOMLY PACKED HOLLOW FIBER MEMBRANE MODULE AND DIFFERENT DESICCANT SOLUTION

Si-Tao Li
Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Li-Zhi Zhang
Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China; State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Abstract

This study is a step forward from previous researches involving hollow fiber membrane contactors for air dehumidification. A compression heat pump driven Membrane-based liquid desiccant system is investigated using a randomly packed cross-flow hollow fiber module. Simultaneous heating and cooling of the desiccant solution are realized with a heat pump system to improve energy efficiency. The novelty is that the desiccant solution used in this system are LiCl-H2O solution, LiBr-H2O solution, CaCl2-H2O solution and their mixture in various proportions. The hollow fiber membrane module used in this system is a randomly packed one. Using the mixture of different kinds of salt solution, though the dehumidifying effects a bit worse than using a single salt solution, the running cost of this system is decreased, because the price of CaCl2 is much lower than LiCl and LiBr. The randomly packed modules are quite different from the tradition modules of aligned arrangement and staggered arrangement. They can be used to reduce the production costs without much adverse affects on the performance of dehumidification.

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