小型金屬平板集熱器之集熱性能研究

The Study of the Thermo Performance of Small Metal Plate Collector

蘇茂源(Mau-Yuan Su)

指導教授 ： 陳長仁

崑山科技大學/工程學院/機械工程研究所/碩士(2010年)

https://doi.org/10.6828/KSU.2010.00096

摘要

本研究之目的是評估小型金屬平板式集熱器，集熱性能與效率。針對單層強化玻璃、單層優白玻璃、雙層優白玻璃等不同面蓋玻璃，單一量測可見光透射率。使用相同條件之集熱器量測整體反射率，反射率越小則太陽輻射可入射越多。
針對單一元件的熱傳特性實驗，將單層強化玻璃、單層優白玻璃、雙層優白玻璃、不鏽鋼外殼。以模擬單邊自然對流與單邊絕熱實驗，得知玻璃與不鏽鋼外殼表面，溫度上升過程中，每度(攝氏)之熱對流係數h與放射率ε不同，用於熱對流與熱輻射的計算會比單一平均值準確性高。
將三種玻璃搭配集熱器，實驗六小時，紀錄集熱器溫升情形，實驗發現隨著時間越長，集熱器溫度越高效率就越低。由溫升曲線中得到最高溫度，利用最高溫度96％時之最佳熱效率區段，可有效提升集熱器之熱效率，使用單層強化玻璃之熱效率為15.6％、單層優白玻璃之熱效率為16.6％、雙層優白玻璃之熱效率為17.4％。

關鍵字

金屬平板式集熱器 ； 集熱性能 ； 熱對流係數 ； 放射率

並列摘要

This research aims to evaluate collecting ability and efficiency of small metallic flat plate collector. Luminous transmittance of visible light penetrating through various types of cover glasses, such as single-layer, super clear single-layer, and super clear double-layer glasses were measured. Collectors with same conditions were used to measure overall reflectivity, the smaller reflectivity the more solar radiation penetrating through.
Single-layer, super clear single-layer, super clear double-layer glasses, and stainless shell as single element were experimented for heat-transfer characteristic. The result of the experiment simulating single-sided natural convection and heat insulation showed that the surfaces of glass and stainless shells had different h (heat convection coefficient) and ε (reflectivity) at each ℃ point during temperature raising, thus its heat convection and radiation calculated had higher accuracy than single average value.
In the 6-hour experiment of these three glasses combining collectors respectively, temperature raise of the collectors recorded displayed that efficiency of the collectors were lowering with time due to increasing of temperature. The best heat efficiency section, 96% of the highest temperature of the temperature raising curve, increased heat efficiency of the collectors to 15.6% on the single-layer glass, 16.6% on the super clear single-layer glass, and 17.4% on the super clear double-layer glass.

並列關鍵字

metal plate collector ； thermo correcting performance ； heat convection coefficient ； emissivity

參考文獻

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