Effect of seawater-coolant feed arrangement in a waste heat driven multi-stage vacuum membrane distillation system

Jung Gil Lee, Chul u. Bak, Thu Kyaw, Noreddine Ghaffour, Young Deuk Kim

Research output: Contribution to journalArticle

Abstract

This paper proposes two types of seawater-coolant feed arrangements of a heat recovery unit (HRU) for improving the performance of a multi-stage vacuum membrane distillation (VMD) system: backward feed (BF) and parallel feed (PF). Theoretical studies were performed to assess the effect of the BF and PF feed arrangements on the system performance. In addition, to comprehensively understand the thermochemical phenomena in both the BF and PF arrangements, spatial variations in the temperature, permeate pressure, permeate flux, and salinity were investigated using a rigorous simulation model that considered the heat and mass transfer across the hollow fibers coupled with the transport behavior on the feed side. To determine the superior HRU configuration between BF and PF, the water production, recovery ratio, and specific energy consumption of the multi-stage VMD system were investigated. It was found that the total water production in the PF arrangement was approximately 2.94 m3/d, which was approximately 6% higher than in the BF arrangement; however, the BF arrangement was more efficient for the production of freshwater than the PF arrangement when a smaller number of module stages was employed. Furthermore, the optimum number of HRUs in the BF arrangement was determined based on this theoretical study.

LanguageEnglish
Pages12-20
Number of pages9
JournalSeparation and Purification Technology
Volume212
DOIs
Publication statusPublished - Apr 1 2019

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Waste heat
Seawater
Distillation
Coolants
Vacuum
Waste heat utilization
Heat transfer
Membranes
Optical fiber coupling
Water
Energy utilization
Mass transfer
Fluxes
Recovery
Temperature

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Effect of seawater-coolant feed arrangement in a waste heat driven multi-stage vacuum membrane distillation system. / Lee, Jung Gil; Bak, Chul u.; Kyaw, Thu; Ghaffour, Noreddine; Kim, Young Deuk.

In: Separation and Purification Technology, Vol. 212, 01.04.2019, p. 12-20.

Research output: Contribution to journalArticle

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