月桂酸-癸酸/十四醇-十二烷复合相变储能材料的制备与性能研究

Preparation and Properties of Lauric Acid-decanoic/Tetradecyl Alcohol-dodecane Composite as PCMs for Thermal Energy Storage

本文研制了一种用于相变温度为5-15℃的储能系统的相变储能材料,该材料由月桂酸（LA）、癸酸（DA）、十四醇（TA）与十二烷（DD）按比例混合经超声波振荡后制得,质量配比为27.1∶28.5∶29.6∶14.8。相变储能材料的性质通过步冷曲线法、差示扫描量热法（DSC）以及热稳定循环测试法等方法来研究。实验结果表明,本相变储能材料的过冷度接近0℃,可忽略不计;在流速为10 m L/min的液氮氛围以及5℃/min的温度变化速率下,相变温度为5.13℃,相变潜热为154 J/g;本材料循环600次后偏离了共融状态,但无分层,具有较好的循环稳定性;通过一系列性能测试,得到了本材料的基本物理性质及热性能。由此可得,本相变复合材料具有较高的潜热、合适的相变温度、较好的热稳定性以及较低的成本,在储能系统尤其是空调系统中表现出了极大的潜力。

The composite phase change material （PCMs） used in thermal energy storage with phase change temperature of 5 - 15℃ are proposed in this paper. The material consists of laurie acid （LA） , decanoic acid （DA） , tetradeeyl alcohol （TA） and dodeeane （DD） , and the mass ratio of its ingredients is 27. 1： 28.5： 29.6： 14.8, respectively. The composite was prepared by ultrasonic oscillations. The properties of the composite were characterized by cooling process, DSC （differential scanning calorimety） , thermal cycling test and so on. The results show that degree of superheat of the composite is close to zero so that it can be ignored; phase change temperature and latent heat of the composite are 5.13 ℃ and 154 J/g at 5℃/min under a constant and steady stream of nitrogen atmosphere at a flow rate of 10 mL/min, respectively; the composite after 600 cycles deviates the eutectic point without phase separation, so it has better thermal stability ; basic physical properties and thermal properties of the composite were gained by a series of property test. Hereby, the composite shows large potential in thermal energy storage, especially in air-conditioning systems, because of high latent heat, suitable phase change temperature, good thermal stability and low cost.