Transport Analysis of an Air Gap Membrane Distillation (AGMD) Process
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 60℃,coolant temperature of 10℃ 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.
Membrane Distillation (MD) Air gap Membrane Distillation (AGMD) Hydrophobic membrane Polyvinyl dene Fluoride (PVDF) membrane Mass transport through membrane Global mass transfer coefficient
M.N.A. Hawlader Rubina Bahar K.C. Ng Loh Jian Wei Stanley
Department of Mechanical Engineering, International Islamic University Malaysia, Jalan Gombak, 53100 Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1,Singap
国内会议
青岛
英文
409-425
2011-06-01（万方平台首次上网日期，不代表论文的发表时间）