碩士 / 淡江大學 / 化學工程與材料工程學系碩士班 / 100 / In this work, we propose a systematic method to study the interaction between design and operability of solar heated membrane distillation seawater desalination systems. Direct contact membrane distillation (DCMD) and air gap membrane distillation (AGMD) modules were explored. Aspen Custom Molder (ACM) platform was used to model and simulate each unit of the system and establish the cost function for counting total annual cost (TAC). From Design degree of freedom (DOF) analysis, design parameters were investigated and used as optimization variables to find the minimum TAC with fixed distillate water production rate by varying the solar energy density. The steady-state simulation result shows the solar driven AGMD desalination systems give the cheaper TAC compared to DCMD ones because of the need for larger size solar collectors for DCMD systems. A secondary hot water storage tank was used and a control structure was proposed to overcome day and night operation. The optimal design for DCMD and AGMD gave a very small operating range due to temperature constrain in effluent stream of solar collectors. In order to widen the operability range of two different plants, the effluent temperature constrains changed from 95 ℃ to 75 ℃. It enlarged the operability range but gave a higher TAC. Finally, the dynamic control results show and verify that the pure water production can be maintained at a very stable level in sunny or cloudy weather by two systems.
| Identifer | oai:union.ndltd.org:TW/100TKU05063075 |
| Date | January 2012 |
| Creators | Shun-Chieh Chang, 張舜傑 |
| Contributors | 何啟東 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 138 |
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