Performance testing of a cross-flow membrane-based liquid desiccant dehumidification system

Bai, Hongyu; Zhu, Jie; Chen, Ziwei; Ma, Lina; Wang, Ruzhu; Li, Tingxian

Abstract

A membrane-based liquid desiccant dehumidification system is one of high energy efficient dehumidification approaches, which allows heat and moisture transfers between air stream and desiccant solution without carryover problem. The system performance is investigated experimentally with calcium chloride, and the impacts of main operating parameters on dehumidification effectiveness (i.e. sensible, latent and total effectiveness) are evaluated, which include dimensionless parameters (i.e. solution to air mass flow rate ratio m∗ and number of heat transfer units NTU) and solution properties (i.e. concentration Csol and inlet temperature Tsol,in). The sensible, latent and total effectiveness reach the maximum values of 0.49, 0.55, and 0.53 respectively at m∗= 3.5 and NTU = 12, and these effectiveness are not limited by m∗ and NTU when m∗ > 2 and NTU > 10. Both the latent and total effectiveness increase with Csol , while almost no variation is observed in the sensible effectiveness. All effectiveness can be improved by decreasing Tsol,in. The experimental data provide a full map of main design parameters for the membrane-based liquid desiccant air conditioning technology.

Citation

Bai, H., Zhu, J., Chen, Z., Ma, L., Wang, R., & Li, T. (2017). Performance testing of a cross-flow membrane-based liquid desiccant dehumidification system. Applied Thermal Engineering, 119, https://doi.org/10.1016/j.applthermaleng.2017.03.058

• Journal Article Type: Article
• Acceptance Date: Mar 12, 2017
• Online Publication Date: Mar 14, 2017
• Publication Date: Jun 5, 2017
• Deposit Date: Mar 14, 2017
• Publicly Available Date: Mar 14, 2017
• Journal: Applied Thermal Engineering
• Print ISSN: 1359-4311
• Electronic ISSN: 1873-5606
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 119
• DOI: https://doi.org/10.1016/j.applthermaleng.2017.03.058
• Keywords: liquid desiccant; membrane-based; dehumidification; performance testing; effectiveness
• Public URL: https://nottingham-repository.worktribe.com/output/864257
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S1359431116336389
• Contract Date: Mar 14, 2017