碩士 / 國立勤益科技大學 / 冷凍空調系 / 106 / This study proposed an improved design for the existing sludge drying and dehumidification with the air-source heat pump system. The prosed design changed the internal configuration of the drying cabin, and improved the heat and mass transfer rate of the air in the cabin. This study used the simulation software to simulate various cabin types, and then built the drying cabin in the best type and conducted the actual measurement verification.
Since the heat pump drying system in this study adopts the design of continuous sludge feed, the efficiency of heat and mass transfer between the sludge on the conveyor belt and the hot air sent from the condenser in the drying chamber becomes very important. This study used the simulation analysis of the computational fluid dynamics (CFD) software to understand the flow field and temperature field distribution in the drying chamber and buffer chamber. Moreover, it used the software to simulate the design of several different air deflectors to find the appropriate air duct design, configuration and system operating parameters. On this basis, this study conducted the theoretical analysis of the thermal cycle, and heat and mass transfer performance of the sludge drying dehumidifier. It also carried out the simulation analysis to improve the flow path in the cabin, enhance the heat and mass transfer efficiency between the hot air and the sludge, and increase the temperature difference between the inlet and outlet. By measuring the SMER (ratio of dehumidification and power consumption) to verify the system improvement effect, it is compared with the type without the air deflector, SMER can improve the dehumidification efficiency by 32.44% and make the error rate between the simulated temperature difference and the actually measured temperature difference not higher than 10% and the moisture content of the discharged dry sludge less than 30%. Finally, those study explored the importance of the air deflector in the entire drying system.
| Identifer | oai:union.ndltd.org:TW/106NCIT5680017 |
| Date | January 2018 |
| Creators | Lin,Cheng-Yan, 林呈晏 |
| Contributors | Luo,Wen-Jie, 駱文傑 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 103 |
Page generated in 0.3651 seconds