石膏基脂肪酸相变储能墙板制备及传热性能研究
发布时间：2019-02-16 22:34
【摘要】：石膏基相变储能材料是一种具有较高储热量的新型建筑节能材料。其节能方式主要是通过热量在时空上的转移,减少空调使用频率来实现。本文主要研究了相变储能石膏墙板的制备技术,并对其力学、传储热等性能进行了表征测试。研究内容如下:癸酸与棕榈酸按照85:15的质量比复配形成的低共熔脂肪酸“合金”,相变潜热较高,相变温度适宜;采用膨胀珍珠岩封装后,可制得复合相变储能材料。DSC测得其相变温度在25.7-34℃范围内,相变潜热为88.39J/g。IR结果显示其稳定性良好,适合用于建筑储能。相变储能石膏板的力学强度随复合相变材料体积掺量的增大快速降低。当柠檬酸掺量在0.01%wt、聚丙烯纤维掺量为0.4%-0.8%wt、萘系减水剂掺量0.6%wt时,复合相变材料体积掺量为30%的相变石膏板力学强度满足规定的强度指标要求;传热性能测试结果表明,相同外界热条件作用下,通过相变储能石膏板的热通量要比普通石膏板少,相变储能石膏板内表面温度和装置空间温度均相对较低;相变储能石膏板具有较高的蓄热能力,用作建筑围护结构,可以有效提高围护建筑的储热能力,降低温度波动幅度。常压45℃物理浸渗条件下制备的石膏基相变储能材料性能较佳;板厚度与最短浸渗时长满足拟合公式y=14.101x1.489,其中x为石膏板的厚度,cm;y为达到最大吸附量时所需的最短浸渗时长,min;吸附量小于20%wt,石膏基相变储能材料渗出稳定性较好;控温性能测试结果表明,石膏基相变储能材料具有较大的储热量,能够将温度长时间控制在人体舒适温度范围;DSC测试表明,相变材料的热性能未受影响,石膏基相变储能材料的潜热值与理论值相当,相变温度范围呈微弱变化;经250次相变循环,石膏基相变材料储能质量损失率仅为2.5%。增加相变夹层的厚度有利于提高夹层相变石膏板的热惰性;掺入10%膨胀石墨,复合相变材料的热响应速度明显提高,即固-液相变进程得到明显提升,同时也在一定程度上提高了夹层相变储能石膏板的蓄热速率,增强了其热交换速度;直掺法和夹层法传热过程对比结果表明:夹层相变石膏板隔热性能更佳,升温结束节点上,其内表面温度以及装置空间温度比直掺法相变石膏板分别要低2.5℃和6℃。
[Abstract]:Gypsum-based phase change energy storage material is a new building energy-saving material with high heat storage. Its energy-saving way is mainly through heat transfer in time-space, reduce the frequency of air-conditioning to achieve. In this paper, the preparation technology of phase change energy storage gypsum wall board is studied, and its mechanical, heat transfer and storage properties are characterized and tested. The research contents are as follows: the low eutectic fatty acid "alloy" formed by the blending of sebacic acid and palmitic acid at 85:15 mass ratio has high latent heat of phase transformation and appropriate transformation temperature; The composite phase change energy storage material can be prepared by using expanded perlite package. The phase transition temperature measured by DSC is in the range of 25.7-34 鈩，
本文编号：2424908
[Abstract]:Gypsum-based phase change energy storage material is a new building energy-saving material with high heat storage. Its energy-saving way is mainly through heat transfer in time-space, reduce the frequency of air-conditioning to achieve. In this paper, the preparation technology of phase change energy storage gypsum wall board is studied, and its mechanical, heat transfer and storage properties are characterized and tested. The research contents are as follows: the low eutectic fatty acid "alloy" formed by the blending of sebacic acid and palmitic acid at 85:15 mass ratio has high latent heat of phase transformation and appropriate transformation temperature; The composite phase change energy storage material can be prepared by using expanded perlite package. The phase transition temperature measured by DSC is in the range of 25.7-34 鈩，
本文编号：2424908
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