通风与相变耦合条件下围护结构最佳蓄热性能

发布时间：2018-07-12 21:29

  本文选题：相变 + 机械送风　； 参考：《化工学报》2017年07期

【摘要】：现阶段用于建筑围护结构的相变构件在蓄热阶段存在蓄热速率较低的问题。为了提高相变构件在蓄热过程中的蓄热速率,将相变构件与机械通风相结合,搭建了相变构件热性能研究实验台,测试了不同送风温度和送风风速工况下相变构件的蓄热性能,采用了有限差分法通过Matlab软件对相变构件蓄热过程进行数值计算以拓展实验送风温度工况,将风机能耗考虑在内,对系统整体的节能效果进行了分析,提出了有效的送风方法。结果表明:提高送风温度或风速可缩短构件相变完成时间,同时可以提高构件表面蓄热热流,当送风风速为1.0 m·s~(-1),送风温度由34℃提高到80℃时,液化过程的平均热流由23 W提高到322 W;同一送风风速工况下,最佳送风时间最终稳定在固定值;在送风温度80℃,送风风速2.0 m·s~(-1)条件下,送风1.6 h时,系统能达到最大节能量,为891.8 k J。
[Abstract]:At present, the phase change components used in building envelope have the problem of low heat storage rate in the stage of heat storage. In order to improve the heat storage rate of phase change components in the process of heat storage, the thermal performance of phase change components was studied by combining phase change components with mechanical ventilation, and the thermal performance of phase change components under different air temperature and wind speed was tested. The finite difference method is used to numerically calculate the thermal storage process of phase change elements by Matlab software to expand the experimental air supply temperature condition. The energy consumption of the fan is taken into account. The energy saving effect of the whole system is analyzed and an effective air supply method is put forward. The results show that increasing the air supply temperature or wind speed can shorten the completion time of phase change and increase the heat flux on the surface of the component. When the air velocity is 1.0 m s ~ (-1), the air supply temperature is increased from 34 鈩，

本文编号：2118519