本文關(guān)鍵詞： 碳系材料 局部吸光 集熱特性　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：如何高效捕集太陽光,產(chǎn)生蒸汽,是太陽能光熱應(yīng)用領(lǐng)域的一個關(guān)鍵問題。本文利用碳系微納結(jié)構(gòu)材料局部吸光沸騰的方法,選用石墨烯、膨脹石墨ER300、膨脹石墨ER50等材料,在光照下加熱水產(chǎn)生蒸汽,探究光功率密度、碳材料層厚度、光源對光熱轉(zhuǎn)換過程集熱特性的影響。實驗表明,添加碳材料有利于提高光照過程蒸汽的產(chǎn)量,在使用紅光燈、光功率密度為2.5 W/cm2、碳材料層厚度為1 mm的條件下,添加石墨烯組蒸汽產(chǎn)量最大,較純水組提高了 16.3%。添加石墨烯可縮短升溫過程所需的時間,添加膨脹石墨ER300可提高蒸汽溫度。碳材料層厚度加大會使蒸汽產(chǎn)量下降,蒸汽溫度提高,在使用紅光燈、光功率密度為2.5 W/cm2的條件下,石墨烯層厚度由1mm增至3mm時,蒸汽產(chǎn)量減少17.3%,蒸汽溫度提高11.5%,同時升溫過程明顯縮短。在兩種光源的對比實驗中,使用氙燈進行實驗時,蒸汽溫度最高為59.4℃。使用紅光燈可提高光照過程蒸汽產(chǎn)量,在光功率密度為1 W/cm2、碳材料層厚度為1mm的條件下,使用紅光燈組產(chǎn)生的蒸汽量分別比使用氙燈組、純水組提高了 136.9%和376.0%。本文通過理論計算得知,碳系微納結(jié)構(gòu)材料吸光沸騰過程中,微納尺寸顆粒間隙作為沸騰核心,在較高光功率密度光照下可產(chǎn)生過熱蒸汽。通過建立傳熱分析模型,計算得出碳材料層表面向環(huán)境輻射、與空氣對流是實驗系統(tǒng)主要散熱途徑,二者總散熱量合占系統(tǒng)輸入總能量的19.7%。
[Abstract]:How to capture solar light efficiently and produce steam is a key problem in solar photothermal application field. In this paper, graphene, expanded graphite ER300, expanded graphite ER50 and other materials are selected by means of local absorption boiling method of carbon system micro and nano structure materials, such as graphene, expanded graphite ER300, expanded graphite ER50 and so on. The effects of light power density, thickness of carbon material layer and light source on the heat collecting characteristics of photothermal conversion process are investigated. The experiment shows that adding carbon material is beneficial to increase the steam output in the process of illumination, and the red light lamp is used. When the optical power density is 2.5 W / cm ~ 2 and the thickness of the carbon layer is 1 mm, the steam output of the graphene group is the largest, which is 16. 3% higher than that of the pure water group. The addition of expanded graphite ER300 can increase the steam temperature, the thickness of the carbon layer will decrease the steam production, and the steam temperature will increase. When the red light lamp is used, the thickness of the graphene layer increases from 1 mm to 3 mm when the optical power density is 2.5 W / cm 2. The steam production was reduced by 17.3%, the steam temperature was increased by 11.5%, and the heating process was obviously shortened. In the contrast experiment between the two light sources, the maximum steam temperature was 59.4 鈩，

本文編號：1551557