碩士 / 國立勤益科技大學 / 冷凍空調系 / 105 / In this thesis, an experimental study on solid desiccant dehumidification is carried out to investigate dehumidification performance of three different composite solid desiccant coated on fin-tube heat exchangers. Each heat exchanger set used in the experiment is consisted of three pieces of 300 × 300 × 160 mm fin-tube heat exchangers which is assembled to one package in series. The first set is coated on 538.5 g silica gel mixed with graphene, and the second set is coated on 667.71 g silica gel mixed with sodium polyacrylate and polyacrylic acid, and the third set is coated on 444.36 g silica gel mixed with calcium chloride.
Then any two of three heat exchangers set are tested simultaneously using a dual duct constant temperature and humidity apparatus. By utilizing dual duct switchover to provide the heat exchanger cold and hot water alternately, the 24℃ cooling water for one 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. The dual duct air inlet conditions are set at 25℃ dry bulb temperature and 70% relative humidity (humidity ratio ω=0.01392 kgH2O/kg da) to test composite solid desiccant dehumidification effect at three different air velocity (1 m/s, 1.5 m/s, 2 m/s) and four different cycle time (3,4,5,6 min). Then the cycle time and air velocity correspond to the optimum dehumidification effect are found out from above experiment data. Furthermore, the dehumidification performance of each kinds of composite solid desiccant is analyzed and compared each other.
The results showed that the total adsorption capacity of every kind of composite solid desiccant increases as cycle time increases when air velocity is fixed. The maximun average adsorption rate per second per gram of composite solid desiccant Sil-Gra's, Sil-PA's and Sil-CA’s are 0.2089 mgH2O, 0.1896 mgH2O and 0.4342 mgH2O respectively, which increase by 44%, 30% and 179% comparing with that of silicone.
| Identifer | oai:union.ndltd.org:TW/105NCIT5680028 |
| Date | January 2017 |
| Creators | KAI SIANG LIN, 林楷翔 |
| Contributors | Lu Chi Wun, 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 | 113 |
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