本研究是要探討利用太陽熱能來提升空氣中取水的能力，方法是把空氣溫度提高，並增加空氣中絕對濕度。實驗的過程可分四個部分，空氣加熱、加濕、降溫、減濕四個步驟，加熱部分由空氣加熱器完成，加濕部分由除濕輪負責，鋁箔軟管和冷凝鰭片則為降溫的部分，減濕部分則由冷凝鰭片達成。太陽能是設計一組4m2的平板式空氣加熱器，利用電熱絲模擬不同太陽日照瓦數，在加熱空氣出口溫度和除濕輪以及冷凍循環搭配下，所取的水量和單純只有冷凍循環的除濕機做比較，加熱瓦數共分成5組，800w、1600w、2400w、3200w、4000w，另外選取兩種環境條件做比較，分別是案例(一)，條件在23℃、相對濕度60％，以及案例(二)，條件在27℃、相對濕度70％，以比較不同加熱瓦數、不同環境下，取水量提升率的變化。實驗結果顯示當太陽能瓦數越高時，離開除濕輪的空氣絕對濕度就越高，水量提升率也愈高，水量提升率可達58％。

This research is to discuss how to use solar energy to increase the amount of water extraction from air. The method is to increase air temperature and absolute humidity in the air. The experimental process can be divided into four parts: air heating, humidification, cooling, and dehumidification. In this study air heater is used to increase the air temperature and desiccant rotor is used to increase the air humidity. Aluminum pipe and condensate fins are used to reduce the air temperature. Condensate fins are used to extract water. This research designs a flat air heater of 4m2 for air heating. To simulate different wattage of sunshine a heated wire has been used. The experiment between the modified system and the original system is done at the same time to compare the difference of water extraction quantity. The heater is divided into 5 groups: 800w, 1600w, 2400w, 3200w and 4000w. Two different environmental conditions are selected. In case 1 condition, air at 23℃ and 60% relative humidity is considered whereas in case 2 condition air at 27℃ and 70% relative humidity is considered and then the two results from the two conditions are compared. It is proved that the quantity of water extraction in modified system is better. The results show that when the solar wattage is higher, the air leaving the desiccant rotor has the higher absolute humidity and has more water in quantity. The water extraction rate is increased by 58%.

[1] Atmospheric Water Systems, I., http://www.aws-h2o.com/.
[2] Nikolayev, V. S., Beysens, D., Gioda, A., Milimouka, I., Katiushin, E., and Morel, J. P., 1996, "Water recovery from dew," Journal of Hydrology, 182(1-4), pp. 19-35.
[3] Wahlgren, R. V., 2001, "Atmospheric water vapour processor designs for potable water production: a review," Water Research, 35(1), pp. 1-22.
[4] Habeebullah, B. A., 2009, "Potential use of evaporator coils for water extraction in hot and humid areas," Desalination, 237(1-3), pp. 330-345.
[5] Scrivani, A., and Bardi, U., 2008, "A study of the use of solar concentrating plants for the atmospheric water vapour extraction from ambient air in the Middle East and Northern Africa region," Desalination, 220(1-3), pp. 592-599.
[6] Muselli, M., Beysens, D., Marcillat, J., Milimouk, I., Nilsson, T., and Louche, A., 2002, "Dew water collector for potable water in Ajaccio (Corsica Island, France)," Atmospheric Research, 64(1-4), pp. 297-312.
[7] Beysens, D., Milimouk, I., Nikolayev, V., Muselli, M., and Marcillat, J., 2003, "Using radiative cooling to condense atmospheric vapor: a study to improve water yield," Journal of Hydrology, 276(1-4), pp. 1-11.
[8] Gandhidasan, P., and Abualhamayel, H. I., 2005, "Modeling and testing of a dew collection system," Desalination, 180(1-3), pp. 47-51.
[9] Alnaser, W. E., and Barakat, A., 2000, "Use of condensed water vapour from the atmosphere for irrigation in Bahrain," Applied Energy, 65(1-4), pp. 3-18.
[10] Gandhidasan, P., and Abualhamayel, H. I., 1996, "Water recovery from the atmosphere," Renewable Energy, 9(1-4), pp. 745-748.
[11] Abualhamayel, H. I., and Gandhidasan, P., 1997, "A method of obtaining fresh water from the humid atmosphere," Desalination, 113(1), pp. 51-63.
[12] Ji, J. G., Wang, R. Z., and Li, L. X., 2007, "New composite adsorbent for solar-driven fresh water production from the atmosphere," Desalination, 212(1-3), pp. 176-182.
[13] Hamed, A. M., 2000, "Absorption-regeneration cycle for production of water from air-theoretical approach," Renewable Energy, 19(4), pp. 625-635.
[14] Aristov, Y. I., Tokarev, M. M., Gordeeva, L. G., Snytnikov, V. N., and Parmon, V. N., 1999, "New Composite sorbents for solar-driven technology of fresh water production from the atmosphere," Solar Energy, 66(2), pp. 165-168.
[15] Gordeeva, L., Tokarev, M., Parmon, V., and Aristov, Y., 1998, "Selective water sorbents for multiple application, 6. Freshwater production from the atmosphere," Reaction Kinetics and Catalysis Letters, 65(1), pp. 153-159.
[16] Karmare, S. V., and Tikekar, A. N., 2009, "Experimental investigation of optimum thermohydraulic performance of solar air heaters with metal rib grits roughness," Solar Energy, 83(1), pp. 6-13.
[17] Mittal, M. K., and Varshney, L., 2006, "Optimal thermohydraulic performance of a wire mesh packed solar air heater," Solar Energy, 80(9), pp. 1112-1120.
[18] Mohamad, A. A., 1997, "High efficiency solar air heater," Solar Energy, 60(2), pp. 71-76.
[19] Wahlgren, R. V., 2001, "Atmospheric water vapour processor designs for potable water production: a review," Water Research, 35(1), pp. 1-22.
[20] Gould, J., 1997, "Catching up — upgrading Botswana's rainwater catchment systems " waterlines, 15(8), pp. pp. 13-20.
[21] 蔡尤溪, 1988, "固體除濕冷卻計畫," No. 778W4, 工業技術研究院能源與礦業研究所, 中華民國.
[22] 吳威毅, 1997, "太陽能除濕空調技術介紹," 中國冷凍空調雜誌, pp. 106-115.
[23] 許菁珊, 2006, "沸石對於光電產業揮發性有機化合物之吸/脫附研究," 碩士, 中山大學, 高雄.
[24] 丁冠堡, 2010, "利用太陽熱能提升空調機性能的研究," 碩士, 成功大學, 台南.
[25] 陳進成, 2004, "由雲、雨、霧的形成談日常生活中的成核現象," 科學發展, 行政院國家科學委員會, pp. 26-33.
[26] 王啟川, 2003, 熱交換器設計, 五南, 台北市.