實驗平台製作與落塵影響光源之分析

Experimental platform setup and analysis on light irradiance due to dustfall

余冠億(Guan-Yi Yu)

指導教授 ： 陳建霖

義守大學/理工學院/機械與自動化工程學系/碩士(2016年)

摘要

南台灣空污較為嚴重，本研究以數值方法模擬太陽光源，並選定特定區域收集落塵量，探討其影響熱能之實驗與數值模擬。本文藉計算流體力學技術模擬燈泡之輻射熱投射於觀察面，並調整模擬玻璃上之數值漫射率來代表落塵量；實驗部分是製作一實驗平台，以PLC控制光源投射所須位置與角度，再結合人造光源模擬燈架進行實驗，此室內實驗是將附著落塵之玻璃放置於平台中，量測其影響觀察面之溫度與輻照度，並以微量天秤量出玻璃上之落塵量；室外實驗則是太陽光照射為主要光源。本研究記錄2016年5、6、7、8月個別二十天數之特定區落塵量，實驗與模擬結果顯示落塵量是影響輻照度與溫度的很大因素，其中6月份的輻照度衰減率到達10.47%，輻照度平均下59.5W/m2，經模擬調整數值漫射率後，數值溫度之最高溫與最低溫分別為54˚C、39˚C，且與實驗中熱像儀所拍攝的溫度圖有一致的趨勢。

關鍵字

太陽熱能 ； 落塵實驗 ； 數值模擬

並列摘要

Air pollution become worse in southern Taiwan. In this study, the numerical method was used to simulate solar beam and the falling dust was collected at the specific place to investigate solar thermal energy experimentally and numerically. By the CFD technique, solar thermal beam was simulated on the observation plane, and the numerical diffuse fraction was adjusted to represent the dustfall quantity. In the experiment, the platform with specific position and angle of the light source adjusted by the PLC controllers and the frame including the light source has been set up and conducted. Under this indoor experiment, the glasses with dustfall were installed inside the platform, and the temperature and irradiance on the observation plane have been measured. The dust quantity was weighted by a micro scale. Dustfall was recorded during 20 days in each month from May to August in 2016. We found that dust amount is critical to temperature and irradiance. Moreover, irradiance attenuation was as high as 10.47% in June and it decreased by the amount of 59.5W/m2. The numerical diffuse factions have been tuned to fit the experimental data the simulated maximal and minimal temperatures at 54˚C and 39˚C respectively, and numerical temperature contours compared with the thermal imager’s results have the similar trends.

並列關鍵字

Solar thermal energy ； dustfall experiment ； numerical simulation

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