奈米流體應用於太陽能熱水器性能之研究

Research on the performance of solar water heaters using nanofluids

蕭智文(Chih-Wen Hsiao)

指導教授 ： 翁輝竹

中原大學/工學院/機械工程研究所/碩士(2013年)

https://doi.org/10.6840/cycu201301052

摘要

本論文完成奈米流體應用於太陽能熱水器性能之分析。主要目的在藉由奈米流體極佳之吸、放熱特性，經過太陽曝曬後吸收輻射熱，並透過傳導方式加熱市用水，而在低熱源下亦可達儲能之效果。首先，我們以平板式集熱器為主體架構，設計一承載奈米流體之槽體。接著，於該槽體內設置循環管路並通以市用水，再以模擬太陽熱源之鹵素燈泡照射其中，同時量測循環管路出口之暫態溫度。最後，透過數理演算獲得流體所吸收之總太陽輻射熱及其占比。研究結果顯示，奈米流體在經過類太陽全譜光輻射熱之鹵素燈泡照射吸收後，流體所吸收之總太陽輻射熱及其占比有明顯提升現象，致使循環管路出口溫度較高、升溫較快，並具有明顯儲能效果。因此，分析結果可證明若將奈米流體應用於太陽能熱水器，對熱水器性能有顯著之提升效果。

關鍵字

奈米流體 ； 太陽能熱水器 ； 集熱器 ； 儲能槽

並列摘要

This study conducts the analysis of the performance of solar water heaters using nanofluids. The main purpose is to use a nanofluid as the absorbing medium, so that the nanofluid can absorb radiative heat and then transfer to the city water through conduction; moreover, it can storage energy well at low heat sources. First, we design a flat-plate solar collector that includes a tank, so as to fill with a nanofluid. Then, we set up a circulation line of city water in the tank, use a halogen bulb to model a heat source of solar energy, and measure the transient temperature. Finally, we obtain the net absorbed solar radiative heat of a fluid and its proportion through mathematical calculations. Results reveal that, after a halogen bulb illumination of full-spectrum light, the net heat absorption of a nanofluid and its proportion have improved significantly. It leads to a higher outlet temperature, a rapid heating, and a significant effect of energy storage of the circulation line. Such an analysis can therefore prove that if nanofluids are used in solar water heaters, the performance is then enhanced significantly.

並列關鍵字

energy storage tanks ； heat collectors ； solar water heaters ； nanofluids

參考文獻

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