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dc.contributor.authorKim, Youngdeuk
dc.contributor.authorThu, Kyaw
dc.contributor.authorGhaffour, NorEddine
dc.contributor.authorNg, Kim Choon
dc.description.abstractThis paper presents a solar-assisted direct contact membrane distillation (DCMD) system with novel energy recovery concepts for a continuous 24-h-a-day operation. A temperature modulating scheme is introduced to the solar-thermal system that supplies feed seawater to the DCMD modules. This scheme attenuates extreme temperature fluctuations of the feed water by storing the collected energy during solar-peak hours and reutilizing it throughout the day. Thus, the energy savings is realized yet the feed seawater temperature is maintained within the desired range. Additionally, the system employs heat recovery from the permeate and brine streams to the feed seawater. The simulations for such a system with a shell-and-tube type DCMD modules are carried out to examine the spatial property variations and the sensitivity of system performance (i.e., transmembrane pressure, permeate flux and performance ratio) to the operating conditions (inlet temperature and flow rate) and the fiber dimensions (fiber length and packing density). It is found that there are trade-offs between mean permeate flux and performance ratio with respect to permeate inlet temperature and flow rate and between total distillate production and performance ratio with respect to packing density. For the solar-assisted DCMD system having evacuated-tube collectors of 3360m2 with 160m3 seawater storage tanks and 50 DCMD modules, the annual solar fraction and the collector efficiency are found to be 77% and 53%, respectively, whilst the overall permeate production capacity is 31m3/day. The overall specific thermal energy consumption of the DCMD system with heat recovery is found to be 436kWh/m3 and it is about 43% lower as compared to the system without heat recovery. It is observed that the specific thermal energy consumption decreases significantly by 55% with increased collector area from 1983m2 to 3360m2 whereas the specific electrical energy consumption increases slightly by 16%. © 2012 Elsevier B.V.
dc.publisherElsevier BV
dc.rightsThis is the author's accepted manuscript. The final version was published in the Journal of Membrane Science in in 2013 with the DOI: 10.1016/j.memsci.2012.10.008
dc.subjectHeat recovery (HR)
dc.subjectHollow fiber direct contact membrane distillation (DCMD)
dc.subjectSolar-assisted desalination
dc.subjectTemperature modulating (TM)
dc.titlePerformance investigation of a solar-assisted direct contact membrane distillation system
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalJournal of Membrane Science
dc.contributor.institutionDepartment of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 117576, Singapore
kaust.personKim, Youngdeuk
kaust.personThu, Kyaw
kaust.personGhaffour, Noreddine
kaust.personNg, Kim Choon

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