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基于相变理论,以石蜡为相变材料、毫米孔径的多孔火山岩为吸附基体,通过真空吸附及环氧包封制备出石蜡/多孔火山岩复合相变材料。对复合相变材料吸附性能、储热性能、导热性能和结晶性能进行表征,并分析多孔火山岩中与石蜡的作用机理。结果表明:多孔火山岩对石蜡的平均吸附率为15.3%;红外光谱分析结果显示二者之间的吸附仅为物理吸附;复合相变材料的相变起始温度为34.2℃,相变焓为35.32J/g,导热系数为0.6972W/(m·K);XRD分析结果表明,石蜡在复合相变材料中仍具有良好的结晶性能。
Based on the phase transition theory, paraffin wax / porous volcanic composite phase change material was prepared by vacuum adsorption and epoxy encapsulation using paraffin wax as phase change material and porous volcanic rock with millimeter diameter as adsorption matrix. The adsorption properties, thermal storage properties, thermal conductivity and crystallization properties of composite phase change materials were characterized, and the mechanism of interaction with paraffin in porous volcanic rocks was analyzed. The results showed that the average adsorption rate of paraffin on porous volcanic rocks was 15.3%. The results of infrared spectroscopy showed that the adsorption between the two was only physical adsorption. The initial phase transition temperature was 34.2 ℃ and the enthalpy of phase transition was 35.32 J / g, the thermal conductivity is 0.6972W / (m · K); XRD results show that the paraffin still has good crystallization performance in the composite phase change material.