| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 100 === Membrane distillation (MD) allows the transfer of water vapor across a porous hydrophobic membrane by providing temperature difference on both sides of the the membrane. MD can be applied for water purification or solution concentration. For the vacuum membrane distillation (VMD), this thesis experimentally investigates pure water, salt water and glucose aqueous solution, in other words, for the applications of desalination and solution concentration, using two types of commercial hollow fiber type membrane distillation modules. A mathematical model is developed for VMD. Experimental and simulation results are very close. The effects of operating conditions are studied by experiments and the model. The significance of the heat and mass transfer resistances inside the modules have been analyzed using the model.
Given that MD requires hot and cold fluids and heat pump can provide hot and cold energies, this thesis proposes the integrated systems of MD and heat pump. Two flowsheets investigated are the air gap MD (AGMD)-heat pump and AGMD+VMD-heat pump. The superstructure concept is employed for developing the configurations, i.e. the split flow alternatives, of the two flowsheets. Using the mathematical models developed on Aspen Custom ModelerÒ platform, the configuration and operating variables are optimized. For both desalination and glucose aqueous solution concentration applications, the performance of AGMD-heat pump flowsheet is better than AGMD+VMD-heat pump flowsheet.
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