石蠟基復(fù)合相變材料的研究及在熱泵系統(tǒng)中的應(yīng)用
發(fā)布時間：2018-09-04 10:00
【摘要】：本文的主要目的是開發(fā)一種新型復(fù)合蓄冷材料和蓄熱材料應(yīng)用于空氣源-太陽能雙熱源熱泵。通過理論分析、實驗研究和數(shù)值模擬相結(jié)合的方法對石蠟基復(fù)合材料進行了研究。制備了分別作為蓄冷材料和蓄熱材料的不同質(zhì)量分數(shù)的石蠟基碳納米管復(fù)合材料和石蠟基納米鋁粉復(fù)合材料,用DSC差熱分析儀表征復(fù)合材料的相變特性,導熱系數(shù)儀測試材料的導熱系數(shù),經(jīng)過20次熔化凝固循環(huán)判斷復(fù)合材料的熱穩(wěn)定性。實驗表明采取濃硝酸酸化碳納米管,超聲震蕩10min并且添加分散劑十二烷基苯磺酸鈉的分散方法,碳納米管質(zhì)量分數(shù)為0.1%的石蠟(RT6)基復(fù)合材料穩(wěn)定性很好,導熱系數(shù)為0.487W/(m·K)(固態(tài))和0.262W/(m·K)(液態(tài)),較純石蠟(RT6)提高了21.1%和29.1%。質(zhì)量分數(shù)為0.5%的穩(wěn)定性較好的石蠟基(RT6)納米鋁粉復(fù)合材料,導熱系數(shù)可以增加到0.513W/(m·K)(固態(tài))和0.277W/(m·K)(液態(tài)),相變溫度為5~8℃,相變焓為155.3~161.6kJ/kg,是一種較好的蓄冷材料。作為蓄熱材料的質(zhì)量分數(shù)為0.5%的石蠟基碳納米管復(fù)合材料和石蠟基納米鋁粉復(fù)合材料的導熱系數(shù)值分別為0.341W/(m·K)和0.359W/(m·K),相比純石蠟提高了26.1%和32.2%,相變溫度和相變焓的變化很小。將研究的新型復(fù)合材料在雙熱源熱泵蓄能換熱器里的熔化和凝固過程進行了數(shù)值模擬,對比純石蠟的熔化凝固過程,導熱系數(shù)較大的復(fù)合材料使得蓄能箱內(nèi)蓄冷、釋冷和釋熱時間都有減少。
[Abstract]:The main purpose of this paper is to develop a new composite heat storage material and heat storage material for air source solar dual heat source heat pump. Paraffin-based composites were studied by theoretical analysis, experimental study and numerical simulation. Paraffin based carbon nanotube composites and paraffin based aluminum nanocomposites were prepared as thermal storage materials and thermal storage materials, respectively. The phase transition characteristics of the composites were characterized by DSC differential thermal analyzer. The thermal conductivity of the composites was measured by a thermal conductivity meter, and the thermal stability of the composites was evaluated after 20 cycles of melting and solidification. The results showed that the stability of paraffin (RT6) matrix composites with 0.1% mass fraction of carbon nanotubes was very good by using the dispersion method of concentrated nitric acid acidified carbon nanotubes (CNTs), ultrasonic oscillating 10min and adding sodium dodecylbenzene sulfonate as dispersant. The thermal conductivity is 0.487W/ (m K) (solid) and 0.262W/ (m K) (liquid), which is higher than that of pure paraffin (RT6) by 21. 1% and 29. 1%. The paraffin-based (RT6) nano-aluminum powder composites with 0.5% mass fraction have better thermal conductivity to 0.513W/ (m K) (solid) and liquid (0.277W/ (m K) (). The phase transition temperature is 5 ~ 8 鈩，
本文編號：2221755
[Abstract]:The main purpose of this paper is to develop a new composite heat storage material and heat storage material for air source solar dual heat source heat pump. Paraffin-based composites were studied by theoretical analysis, experimental study and numerical simulation. Paraffin based carbon nanotube composites and paraffin based aluminum nanocomposites were prepared as thermal storage materials and thermal storage materials, respectively. The phase transition characteristics of the composites were characterized by DSC differential thermal analyzer. The thermal conductivity of the composites was measured by a thermal conductivity meter, and the thermal stability of the composites was evaluated after 20 cycles of melting and solidification. The results showed that the stability of paraffin (RT6) matrix composites with 0.1% mass fraction of carbon nanotubes was very good by using the dispersion method of concentrated nitric acid acidified carbon nanotubes (CNTs), ultrasonic oscillating 10min and adding sodium dodecylbenzene sulfonate as dispersant. The thermal conductivity is 0.487W/ (m K) (solid) and 0.262W/ (m K) (liquid), which is higher than that of pure paraffin (RT6) by 21. 1% and 29. 1%. The paraffin-based (RT6) nano-aluminum powder composites with 0.5% mass fraction have better thermal conductivity to 0.513W/ (m K) (solid) and liquid (0.277W/ (m K) (). The phase transition temperature is 5 ~ 8 鈩，
本文編號：2221755
本文鏈接：http://sikaile.net/kejilunwen/cailiaohuaxuelunwen/2221755.html
最近更新
教材專著
