Transport analysis of an Air Gap Membrane Distillation (AGMD) process

Hawlader, Mohammad Nurul Alam and Bahar, Rubina and Ng, K. C. and Loh, Jian Wei Stanley (2011) Transport analysis of an Air Gap Membrane Distillation (AGMD) process. In: Qingdao International Conference 2011---on Desalination and Water Reuse, June 20-23, 2011, Qingdao, China. (Unpublished)

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Abstract

Membrane distillation (MD) desalination is an emerging technology for fresh water production. This process incorporates phase change and transport of vapour through a hydrophobic membrane due to difference in vapour pressure across the membrane. The results from experimental studies and the 1 dimensional transport analyses of the heat and mass transfer processes on an air gap MD (AGMD) unit are presented in this paper. The effects of different operating variables including feed and coolant temperatures, air gap, membrane support mesh size, feed concentration and feed and coolant flow rates were investigated. Mass transport through membrane, membrane support, air gap and condensation on the coolant plate has been analysed and expression for global mass transfer coefficient has been derived. The maximum distillate flux achieved was 5.11 kg/m2hr at a feed temperature of 60oC, coolant temperature of 10oC and an air gap of 2.5 mm. Per kW of energy input a 2.32 kg/m2hr flux was obtained. Feed temperature and air gap width were found to have significant influence on the performance of the membranes.

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	6548/4092
Uncontrolled Keywords:	Membrane Distillation (MD), Air gap Membrane Distillation (AGMD), Hydrophobic membrane, Polyvinylidene Fluoride (PVDF) membrane, Mass transport through membrane, Global mass transfer coefficient
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ163.26 Energy conservation
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof Mohammad Nurul Alam / M N A Hawlader
Date Deposited:	17 Oct 2011 12:08
Last Modified:	19 Oct 2011 10:32
URI:	http://irep.iium.edu.my/id/eprint/4092

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