本文選題：相變儲熱 + 鋁合金��； 參考：《華北電力大學》2015年碩士論文

【摘要】：利用太陽能發(fā)電可以有效緩解傳統(tǒng)熱力發(fā)電帶來的能源短缺、資源枯竭、環(huán)境污染等問題。太陽能集中式熱發(fā)電系統(tǒng)效率高,易于大型化,發(fā)展?jié)摿薮?然而太陽能的獲取與實際能量的需求之間常常是不匹配的,因此需要配備儲熱子系統(tǒng)來實現能量的連續(xù)供應。儲熱系統(tǒng)工作效率的高低很大程度上取決于所采用的儲熱介質,相變儲熱材料可實現在基本恒定的溫度下儲存大量的相變潛熱,具有很大的應用前景。而在高溫相變儲熱材料中,鋁基合金因其優(yōu)良的性能表現出了極大的發(fā)展?jié)摿�。本文主要針對鋁基合金相變儲熱材料開展相關的熱物性及其儲熱特性研究。論文在對鋁基合金相變儲熱材料進行成分設計的基礎上,經高溫熔煉制備了多種鋁基二元和三元相變儲熱材料。采用滴定法、重量法和電感耦合等離子體發(fā)射光譜法相結合測試了相變儲熱材料的成分,采用差示掃描量熱法測定了鋁基合金材料的相變溫度、相變潛熱及比熱,采用激光脈沖法在不同溫度下測量了鋁基合金相變材料的熱擴散率,并計算得到了相應的導熱系數,得到了元素種類和添加量對鋁基合金材料主要熱物性的影響規(guī)律,結合實驗研究結果分別推薦了計算不同溫度下鋁基合金相變儲熱材料的比熱計算公式和導熱系數計算公式,對試樣在400～800℃內的總儲熱量進行了計算分析,得到了合金元素種類和添加量對鋁基合金單位質量材料儲熱量和單位體積儲熱量的影響規(guī)律。綜合衡量了所制備的各合金材料的相變溫度、相變潛熱、單位質量和單位體積儲熱量及導熱系數,得到了具有最優(yōu)儲熱性能的鋁合金相變儲熱材料,為相關儲熱系統(tǒng)設計提供了基本的物性參數及參考依據。
[Abstract]:Solar power generation can effectively alleviate the problems of energy shortage, resource exhaustion and environmental pollution caused by traditional thermal power generation. The solar centralized thermal power generation system is highly efficient, easy to be large, and has great potential for development. However, solar energy is often not matched with the actual energy demand, so it is required to be equipped with a thermal storage system. The efficiency of the heat storage system depends largely on the heat storage medium used. The phase change heat storage material can actually store a large amount of latent heat of phase change under the basic constant temperature, and it has a great application prospect. In the high temperature phase change heat storage material, the aluminum base alloy is characterized by its excellent performance. In this paper, the thermal properties and heat storage characteristics of aluminum based alloy phase change materials are mainly studied in this paper. On the basis of the composition design of the aluminum based alloy phase change materials, a variety of aluminum based two and three phase thermal storage materials have been prepared by high temperature melting. The phase change temperature, latent heat and specific heat were measured by differential scanning calorimetry (differential scanning calorimetry). The thermal diffusivity of Al based alloy phase change materials was measured at different temperatures by laser pulse calorimetry. The corresponding thermal conductivity system was calculated. The effect of element type and addition amount on the main thermal properties of aluminum based alloy materials is obtained. The calculation formula for calculating the specific heat and thermal conductivity of the phase change heat storage materials at different temperatures are recommended respectively. The total heat storage of the sample at 400~800 C is calculated and analyzed. The effect of the type and amount of alloying elements on the heat storage and unit volume heat storage of the aluminum base alloy per unit mass material is studied. The phase change temperature, latent heat of phase change, unit mass and unit volume heat storage and thermal conductivity are synthetically measured, and the phase change heat storage material with the best heat storage property is obtained. The material provides basic physical parameters and references for the design of the relevant heat storage system.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB34

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本文編號：2016412