噴霧冷卻結合淺層溫能應用於太陽能光電板散熱

隨著科技發展，能源議題漸漸受到重視。煤炭的使用不只使溫室氣體急遽增加也使能源短缺的問題越來越明顯，各國開始重視再生能源的開發如：太陽能、風力、水力、潮汐、地熱能…等，其中淺層溫能被視為能有效達節能的目標。以太陽能光電板為例，目前市面上太陽能光電板效率約為10%~20%，也就是說在發電過程中會有七成的能量轉成熱能，如此大量的廢熱如不進行處理會使原本低效率的太陽能光電板工作效率更低進而降低發電量。目前降溫方式大多在背面貼冷板(cold plate)或在太陽能光電板正面噴水做散熱，在正面噴水會降低板子吸收陽光的量，冷板則是維修不易、笨重。隨著再生能源興起，淺層溫能的應用被視為能降溫且節能的有效方式，利用地埋管熱交換器攫取淺層溫能。因此，本研究將針對太陽能光電板背面做噴霧冷卻並結合淺層溫能對冷卻水作降溫，運行整個系統做冷卻測試。在一般應用上，太陽能光電板對地面傾斜23.5˚且在發電過程中將產生大量廢熱，本研究在背板架設噴嘴並以液態水進行噴霧，而地埋管熱交換器則以液態水為工作流體，流經噴嘴打到背板將熱能帶入地埋管與土壤進行熱交換。本地埋管熱交換器採用螺旋管，以塊狀系統來簡化螺旋管的熱傳模式建立數學模型，並以實驗和數學理論模式相互結合。結果顯示以淺層溫能作為太陽能光電板的散熱系統能有效的降溫，而理論與實驗結果也將有一致性，提供未來研究後續的基礎。

關鍵字

淺層溫能；地埋管熱交換器；太陽能光電板散熱；噴霧冷卻

並列摘要

Energy issues are getting more and more attention along with the development of technology. The use of Fossil fuels not only produces a great amount of greenhouse gas, but also causes the shortage of energy. Many countries begin to enhance the development of renewable energy such as solar energy, wind energy, hydraulic energy, tidal energy, geothermal energy, and so on. Besides, Sallow geothermal energy is regard as the effective one. For instance, PV panels on market have the efficiency about 10%~20%. And that is to say 70 percent of the generated energy is transferred into heat during the electricity generating process. If we do not deal with this great amount of waste heat, it will make the efficiency much lower. At the present, most of the ways to lower the temperature of PV panels are pasting cold plates on the back of PV panels or spray water on them. Spraying water on the PV panels will reduce the amount of absorbed solar energy. Besides, cold plates are heavy and difficult to repair. Along with the rise of renewable energy, shallow geothermal energy absorbed through borehole exchangers is viewed as an effective way on energy conservation. Therefore, this thesis is mainly about lowering the temperature of the sprayed water on the back of PV panels with borehole exchangers in experiments. In this experiment, PV panels are tilted with 23.5˚ angle, and they produce a great amount waste heat. Besides, nozzles are set on the back of PV panels to spray water. Furthermore, the borehole exchangers lower the temperature of the sprayed water. Bolehole exchangers in this experiment adopt spiral pipes and use lump system to simplified the heat transfer model. And this thesis combines the theory and experiment. The results show that using borehole exchangers as the method of cooling is very effective. And the theory consists with the experiment also, which becomes the foundation of later researches.

並列關鍵字

geothermal energy ； borehole heat exchanger ； PV cooling ； spray cooling

參考文獻

[1] 台灣電力公司http://www.taipower.com.tw/

Google Scholar

[2] 張子文,”太陽電池應用於建築上之研究”,國立成功大學建築系碩士論文,2001。

Google Scholar

[3] H.G. Teo, P.S. Lee b, and M.N.A. Hawlader,” An active cooling system for photovoltaic modules,” Applied Energy 90 (2012) 309–315

Google Scholar

[4] Decebal Bl ,”Cooling System for Photovoltaic Module,” Recent Researches in Environmental and Geological Sciences

Google Scholar

[5] Loredana DOROBANŢU,and Mihai Octavian POPESCU2,”Increasing the efficiency of photovolatic panels through cooling water film,” U.P.B. Sci. Bull., Series C, Vol. 75, Iss. 4, 2013

Google Scholar

國際替代計量

噴霧冷卻結合淺層溫能應用於太陽能光電板散熱

全文下載

主題瀏覽