复合相变材料空心砌块的研制及热性能实验分析

Development of Composite Phase Change Material Hollow Block and Experimental Analysis of Its Thermal Performance

本文选用1种典型结构的混凝土空心砌块以及常用的相变材料(PCM),提出1种复合PCM空心砌块的制作方法,将PCM放入空心砌块内的不同厚度位置制成多种形式的复合砌块,采用变温热箱法对不含PCM及含有PCM的空心砌块墙体进行了多组不同温度条件下的实验测试,分析了各墙体热工性能差异的原因。研究结果表明:含PCM空心砌块墙体的温度衰减量、衰减倍数与延迟时间均较不含PCM、相同结构的空心砌块墙体显著增加;若能保持墙体中PCM的温度始终没有超越其相变温度区间,则可使复合PCM空心砌块墙体达到较好的非稳态热工性能。

A type of concrete hollow block with typical structure and a common phase change material （PCM） was adopted, a manufacture method for composite PCM hollow blocks was proposed, and the PCM was put into different thickness positions of the hollow blocks, by which multiform composite PCM hollow blocks were developed. The temperature-changing hot chamber method was adopted to test the thermal performance of the hollow block walls with or without PCM under different temperature conditions. The causes of the difference of the thermal performance of each hollow block wall were analyzed. The results show that the temperature decrement, decrement factor and time lag of the wall with PCM all increased apparently, compared with the hollow block wall with the same structure and without PCM. Therefore, it can reach high unsteady-state thermal performance of the composite PCM hollow block wall by keeping the PCM temperature in the wall within its phase transition range.