4TH International Congress on Technology - Engineering & SCIENCE - Kuala Lumpur - Malaysia (2017-08-05)

Numerical Dynamic Simulation Of Vacuum Membrane Distillation Plant
Behavior of the flow regime inside the narrow channels of vacuum membrane distillation is addressed in this work, which is driven by solar linear Fresnel collector. The steady state and dynamic simulation are applied. The simulation methodology employed for modeling the heat and mass transfer processes in flat plate vacuum membrane distillation (VMD) under laminar and turbulent flow regimes. The work will focus on effect of operating conditions and VMD system dimensions on local temperatures, heat transfer coefficients, temperature polarization coefficients, heat & mass fluxes and total thermal efficiency in the lumen of the fibers and the shell in vacuum. Thermal efficiency modeled with feed temperature and feed velocity. Temperature and concentration polarization vs feed temperature and low feed velocity are presented. Mass transfer was controlled by the heat transfer in the feed boundary. Local heat and mass fluxes decreased along the fiber length because of high local heat transfer coefficient in the inlet region and thin thermal boundary. More importantly, total thermal efficiency will be effected dramatically with the module length. Keywords: Vacuum membrane distillation, heat and mass transfer, dynamic model and behavior.
Ashraf Hassan, Hassan Fath