二种低温固液相变储能材料的制备及其性能研究

发布时间：2018-02-17 00:00

  本文关键词： 相变材料 十水硫酸钠 石蜡微胶囊 相变温度 相变潜热　出处：《北京石油化工学院》2015年硕士论文　论文类型：学位论文

【摘要】：相变材料(PCM)作为储能材料具有相变潜热巨大、性能稳定等优点,相变材料在相变过程中,可以从周围环境中吸收热(冷)量,并在需要时放出热(冷)量,该过程中材料自身的温度不发生变化,从而达到控制周围环境温度的目的。相变储能材料作为储能载体,可缓解能源紧张的难题。与其它同类型相变材料相比,十水硫酸钠和石蜡具有相变潜热高,性能稳定,无毒无污染,廉价易得等优点。但是十水硫酸钠在结晶过程中容易出现过冷、相分离和结块问题,而石蜡在固相变为液相过程中液相容易泄漏,且易其它材料混合而发生副作用,这限制了它们的应用。本文制备出了性能优良、相变温度为室温的以十水硫酸钠为主体成分的相变储热体系,较好地解决了十水硫酸钠相变材料体系的过冷、相分离和结块问题。该体系的相变焓为107.5J·g-1、相变温度为27.0℃。最佳配方为十水硫酸钠75.4%、水12.0%、硼砂3.0%、羧甲基纤维素钠2.0%、十二烷基苯磺酸钠0.23%、十二烷基硫酸钠0.12%、十二水硫酸铝钾0.40%、乙二胺四乙酸二钠盐0.75%、六偏磷酸钠0.15%、NaCl 6.0%。采用原位聚合法制备了以石蜡为囊芯,蜜胺树脂为囊壁的石蜡微胶囊相变材料。通过考察,确定其最佳配方为:三聚氰胺7g,甲醛13mL,乳化剂TA5g,乳化水150mL。最佳实验条件为搅拌速度1500r/min,石蜡微胶囊芯壁比为5.6:1。本文分别对二种相变材料的相变特性进行了研究。利用傅里叶变换红外光谱仪、差示扫描量热仪、扫描电镜等设备对制备的相变材料进行了测试和表征。
[Abstract]:PCM) as a kind of energy storage material has the advantages of large latent heat and stable performance. In the process of phase transformation, PCM can absorb heat (cold) from the surrounding environment and release heat (cold) when needed. In this process, the temperature of the material itself does not change, thus achieving the purpose of controlling the ambient temperature. As a carrier of energy storage, the phase change energy storage material can alleviate the problem of energy shortage. Sodium sulfate decahydrate and paraffin have the advantages of high latent heat of phase change, stable performance, non-toxic and pollution-free, cheap and easy to obtain. However, sodium sulfate decahydrate is prone to supercooling, phase separation and caking during crystallization. In the process of changing paraffin into liquid phase, the liquid phase is easy to leak, and the side effects of other materials are easy to be mixed, which limits their application. The phase change thermal storage system with sodium sulfate decahydrate as the main component at room temperature can better solve the supercooling of phase change material system with sodium sulfate decahydrate. Phase separation and caking. The enthalpy of phase transition is 107.5 J 路g-1, phase transition temperature is 27.0 鈩，

本文编号：1516738