碩士 / 國立勤益科技大學 / 冷凍空調系 / 104 / In recent years, the air-conditioning equipment development towards a new concept of "wet and dry separation", namely, the dehumidification and cooling are processed separately. For the high energy consuming dehumidification, if water vapor in air flow can be absorbed by solid desiccant which is kept at normal temperature, then the energy efficiency of cooling equipment can be improved. This study investigates the dehumidification process experimentally, discusses the dehumidification characteristic of solid desiccant (silica gel, sodium polyacrylate) coated on the fin-tube heat exchanger.
In this study, coating two groups fin-tube heat exchangers that one group uses silica gel 1006 g, other group uses sodium polyacrylate 277.5 g. Two group of the desiccant coated on the heat exchangers are mounted at the each air duct respectively. By using dual duct switchover to provide the heat exchanger cold and hot water alternately, the 24℃ cooling water for an air duct heat exchanger adsorption process while the 66℃ hot water for another air duct desorption(or regeneration) process are supplied from a heat pump water heater simultaneously. This study uses the 25℃ dry bulb temperature and 65% relative humidity (humidity ratio ω = 0.013 kgH2O/kg da) for the air inlet conditions. The dehumidification performance of solid desiccant coated on the fin-tube heat exchanger is tested at each air velocity (1 m/s, 1.5 m/s, 2 m/s) and each cycle time (3,4,5,6 min). We are expecting to find the best dehumidification performance by the experiment. Using the data above, the dehumidification performance of solid desiccant coated on the fin-tube heat exchanger is analyzed, and different desiccants are compared.
The experimental results shows that both of solid desiccant coated on the fin-tube heat exchanger has the best dehumidification when the air velocity is increase. The silica gel has the stable adsorption effect than sodium polyacrylate. When the air velocity is 2 m/s and the cycle time is 4 minute, both the solid desiccant coated on fin-tube heat exchanger have the maximum adsorption rate per gram, 0.4740 mgH2O and 0.1474 mgH2O respectively.
| Identifer | oai:union.ndltd.org:TW/104NCIT5680021 |
| Date | January 2016 |
| Creators | Geng-Wei Lin, 林耕瑋 |
| Contributors | Chi-wen Lu, 陸紀文 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 112 |
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