碩士 / 淡江大學 / 化學工程與材料工程學系碩士班 / 102 / Small-scale solar membrane distillation desalination system (s-SMDDS) is a sustainable technology for resolving the water resource problem in remote arid areas. However, the optimal design of the system has not been systematically investigated. This study developed the mathematical models and experimental systems of the membrane distillation modules, including air gap, direct contact and vacuum types, as well as the overall systems. For the membrane distillation modules, the relative deviation of the simulation results relative to the experimental results is about 10%. The trends of the simulated values and experimental values are similar, and the main reason of the deviation is that the efficiency of solar collector is smaller than the simulate setpoint. The equipment sizes and operation conditions for the water producton with minimum unit costs were determined by a systematic method. The optimization analysis employed the mathematical models, a pseudo steady state approach and the dynamic optiomization. The minimum unit costs of the systems utilizing air gap, direct contact and vacuum membrane distillation modules are $5.16/m3, $9.37/m3 and $9.44/m3 for the production rates of 1000 kg/day, 800 kg/day and 800 kg/day, respectively. For all the systems, the cold side heat recovery for the membrane distillation module should be adopted.
For the membranes employed in this study, the enhancement of membrane mass transfer coefficient up to two times is beneficial for cost reduction. The 50% reduction of the thermal conductivity of the membrane can reduce the unit cost by 20% for the system using direct contact membrane distillation.
| Identifer | oai:union.ndltd.org:TW/102TKU05063020 |
| Date | January 2014 |
| Creators | Chen-Yu Hung, 洪承佑 |
| Contributors | Cheng-Liang Chang, 張正良 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 155 |
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