熱電除濕器(Thermoelectric dehumidifier)，由於具有無噪音、適用於小空間且對環境無污染等優點，最近幾年漸被廣泛地應用。
　　但是一般市售之熱電除濕器效率甚低，為了增進其效能係數，吾人首先將除濕所得之冷凝水利用毛細原理將其導至除濕器熱端作蒸發散熱，然後再針對熱電除濕器的冷端吸熱部份作改善，藉由進行鰭片間距最佳化，減小熱阻等熱傳原理來增進冷端之熱傳效率。
　　在實驗中我們試著改變各種參數：輸入能量、鰭片間距、散熱片材質、在散熱片表面批覆上有機物質、鰭片放置方向，以期找出能增大除濕速率的最佳方法，並且和理論進行驗證。
　　經由實驗結果得知將冷凝水擴散至熱端作蒸發散熱，幾乎可以取代風散之強制對流散熱，而將冷端散熱鰭片間距最佳化，可使散熱片的熱交換量最大，也使熱電除濕器得到最大的性能係數。

　　Thermoelectric dehumidifier has the advantage of quietness, being used in small space, and no contamination, it has thus gradually gained more market shares.
　　In order to improve the COP, the water condensate obtained from indoor humidification was sucked by a cotton cloth. Since the wetted cotton sheet was spread over the hot end surface, over which the condensate will eventually evaporate into the outdoor environment. With evaporation cooling on the hot end surface, the focus is then concentrated on the heat transfer enhancement of cold-end side.
　　The optimization of fin-to-fin spacing and the decrease on the overall thermal resistance were analyzed and assured by experimental tests. In experiments we try to change various parameters including the fin-to-fin spacing, the material of fin, the coating of finned surface, and the direction of fin-array.
　　The experimental results indicated that the cooling effect due to the evaporation on hot-end surface is strong enough to replace the fan cooling, and the optimization of fin-to-fin spacing is the most effective way to improve the heat transfer coefficient of cold-end side.

[1] R.K. Al-Dadah, T.G. Karayiannis, Passive enhancement of condensation heat transfer, Applied Thermal Engineering, Vol 18, 1998, pp. 895~909.

[2] A. Bar-Cohen and W. M. Rohsenow, Thermally optimum spacing of vertical, natural convection cooled, parallel
plates, J. Heat Transfer, Vol. 106, 1984, pp. 116-123.

[3] A. Bejan, G. Tsatsaronis, M. Moran, Thermal Design & Optimization, Wiley, 1996, pp. 247-251.

[4] J.P. Fleurial, A. Borshchevsky, T. Caillat, and R. Ewell, New Materials and Devices for Thermoelectric Application, Applied Thermal Engineering, Vol. 22, 2002, pp. 407-422.

[5] B.J. Huang, C.J. Chin, C.L. Duang, A Design of thermoelectric cooler, Int. J. of refrigeration, Vol.23, 2000, pp.208-218.

[6] G. Koch, K. Kraft, A. Leipertz, Parameter study on the performance of dropwise condensation, Rev. Gen. Therm, Vol. 37, 1998, pp. 539- 548.

[7] Kwang J. Kim, Arne M. Lefsaker, Arsalan Razani, Arron Stone, The effective use of heat transfer additives for steam condensation, Applied Thermal Engineering, Vol. 21, 2001, pp. 1863-1874.

[8] G. Ledezma and A. Bejan, Heat sinks with sloped plate fins in natural and forced convection, Int. J. Heat Mass Transfer, Vol. 39, 1996, pp. 1773-1783.

[9] Andrea de Lieto Vollaro, Stefano Grignaffini and Franco. Gugliermetti, Optimum design of vertical rectangular fin arrays. Int. J. Therm. Sci, Vol 38, 1999, pp. 525-529.

[10] X. Ma, J. W. Rose, D Xu, J. Lin, B. Wang, Advances in dropwise condensation heat transfer: Chinese research, Chemical Engineering Journal, Vol. 78, 2000, pp. 87-93.

[11] G.S. Nolas, G.A. Slack, J.L. Cohn, and S.B. Schujman, The Next Generation of Thermoelectric Materials, Proceeding of the 17th International Conference on Thermoelectrics, 1998, pp. 294~297.

[12] S.B. Rifft, S.A. Omer, Xiaoli Ma, A novel thermoelectric refrigeration system employing heat pipes and a phase change material: an experimental investigation, Renewable Energy, Vol. 23, 2001, pp. 313-323.

[13] R.E. Simons and R.C. Chu, Application of thermoelectric Cooling to Electronic Equipment: A Review and Analysis, Sixteenth IEEE SEMI-THERM Symposium, 2000, pp. 1~9.

[14] V. Srinivasan and R. K. Shah, Fin efficiency of extended surfaces in two-phase flow, Int. J. Heat and Fluid Flow, Vol. 18, 1997, pp. 419-429

[15] J.G. Vian, D. Astrain, M. Dominguez, Numerical modeling and a design of a thermoelectric dehumidifier, Applied Thermal Engineering, Vol. 22, 2002, pp.407-422.

[16] Frank P. Incropera, David P. DeWitt, Introduction to Heat Transfer, Wiley, 1996, pp. 114-118.

[17] Frank P. Incropera, David P. DeWitt, Introduction to Heat Transfer, Wiley, 1996, pp. 126-128.

[18] Yunus A. Cengel, Heat Transfer-A Practical Approach, McGraw-Hill, 1998, pp.654-656.

[19] Yunus A. Cengel, Heat Transfer-A Practical Approach, McGraw-Hill, 1998, pp.660-664.

[20]王啟川，多成分混合物的冷凝器與蒸發器的熱流設計(上)，冷凍與空調，2001年12月，pp. 53-64.

[21]周德九, “簡介熱電”, 能源季刊, (1990.04), 85-97

[22]鄭超元，冷凍空調，文笙總經銷，1994年6月，pp. 230.

[23]中華名國專利第113157號，電子除濕機，林繁青

[24]中央氣象局網站：www.cwb.gov.tw/v3.0/index.htm