一种新型复合相变材料导热性能的实验研究

针对相变材料在实际应用过程中交替存在升温液化和降温固化的复杂传热过程,采用JW-Ⅲ建筑材料热流计式导热仪,分别对升温和降温过程中处于固态、混合态、液态的新型复合相变材料导热性能进行了测试和分析。研究结果表明,复合相变材料在加热和冷却过程中的导热系数随温度的变化存在明显的规律性差异,导热系数在混合态时差值达到20%;升温过程中,复合相变材料在混合态和液态时的导热系数值相差不大,但与固态时相比有明显减小;降温过程中,在液-固相变的过程中导热系数随温度减小而增大,有利于加速相变材料的固化。

Experimental Study on Thermal Properties of one New Type Composite Phase Change Material

For complex heat transfer of heating liquefaction and cooling solidification alternately occurring in phase change material （PCM） practical application process, thermal conductivity of one new type composite PCM at its solid state, mixed state and liquid state of heating and cooling process was tested and analyzed, by means of JW-Ⅲ heat flow meter typeconductometer of building materials. The results show that the thermal conductivity of this composite PCM behaves obvious regular difference with temperature change in its heating and cooling process.Meanwhile, the difference reaches 20% at the mixed state.The difference of its thermal conductivity derived from the mixed state and liquid state is small for heating process, which is much less than that at solid state.In addition, its thermal conductivity increases with decline of the temperature for cooling process of liquid-solid phase change, which is benefit for PCM solidification quickly.