Experimental Study on Liquid Desiccant Regeneration in Air Conditioning System by Vacuum Membrane Distillation
To address the issues of lower thermal efficiency, susceptibility to environmental influences, and floating liquid desiccant in traditional liquid desiccant regeneration methods using packed towers, this article proposes a liquid desiccant regeneration method based on vacuum membrane distillation. T...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2021-01-01
|
| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2021.04.091 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | To address the issues of lower thermal efficiency, susceptibility to environmental influences, and floating liquid desiccant in traditional liquid desiccant regeneration methods using packed towers, this article proposes a liquid desiccant regeneration method based on vacuum membrane distillation. The effects of liquid desiccant temperature, flow rate, mass fraction, and the vacuum degree of the system on the membrane flux, thermal efficiency, transmembrane mass transfer coefficient, and rejection rate were studied through experiments and simulations. The results show that the membrane flux increases with an increase in the liquid desiccant temperature, flow rate, and vacuum degree of the system and decreases sharply with an increase in the liquid desiccant mass fraction. The deviation of the experimental membrane flux from the simulated ones are within ±10%. The thermal efficiency increases and tends to be constant with the increase in liquid desiccant temperature and the vacuum degree of the system and decreases with an increase in the liquid desiccant flow rate and mass fraction. The transmembrane mass transfer coefficient increases with the increase in liquid desiccant temperature, flow rate, and system vacuum, and decreases with an increase in the liquid desiccant mass fraction. In the experiment, when the liquid desiccant temperature, the flow rate and the mass fraction are 80 ℃, 1.0 m/s and 20%, respectively, the vacuum degree of the system is 93 kPa, and the membrane flux reaches the maximum, which is 7.18 kg/(m2?h). Even at a high mass fraction of 40%, the membrane flux can still reach 1 kg/(m2?h). The thermal efficiency is generally higher than 80%. When the solution flow rate is 0.6 m/s, all performance parameters can reach a higher level. |
|---|---|
| ISSN: | 0253-4339 |