基于复合相变材料的梯级相变辐射末端实验研究  

Experimental study of cascade phase change radiation terminal based on composite phase change materials

作　　者：孔祥飞[1] 姜丽娜 任键林 KONG Xiangfei;JIANG Lina;REN Jianlin(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《河北工业大学学报》2022年第3期52-63,共12页Journal of Hebei University of Technology

基　　金：国家自然科学基金(51978231);河北省自然科学基金(E2020202196);中央引导地方科技发展资金项目(216Z4502G);河北工业大学基础研究基金(JBKYTD2003);河北省引进留学人员资助项目(C20190507)。

摘　　要：用以营造室内适宜冷、热环境的暖通设备能耗在建筑能耗中占比巨大,提升建筑供能系统的能源利用效率日趋重要。本研究通过膨胀石墨吸附石蜡,并用相变微胶囊(MPCM)对其进行二次表观吸附,制成2种不同相变点的高导热高焓值的微复合相变材料(M-CPCM1,M-CPCM2)。采用扩散渗出圈法、扫描电子显微镜和差示扫描量热仪对材料进行测试,结果表明复合相变材料吸附率可达89.13%且无泄漏;同时复合相变材料具有很好的热稳定性。将这2种相变点在热舒适区间的M-CPCMs压制成相变蓄能砖,分别构建集成地板和顶板,内嵌冷、热媒盘管,形成可梯级蓄热的辐射蓄供冷、热末端。采用“热媒水先入地板后入顶板,冷媒水先入顶板后入地板”的双主动式梯级利用供能模式,在天津冬夏两季典型气温条件下,对梯级相变辐射末端进行热性能测试。结果表明,这种供能模式可以有效提高能源利用效率,节能效果显著。The energy consumption of HVAC equipment used to create a suitable indoor cold and hot environment ac⁃counts for a large proportion of building energy consumption,so it is increasingly important to improve the energy effi⁃ciency of building energy supply system.In this study,paraffin wax was adsorbed by expanded graphite,and then ad⁃sorbed by microencapsulated phase change material(MPCM)for the second time,so as to prepare two kinds of composite phase change materials(M-CPCM1,M-CPCM2)with high thermal conductivity and enthalpy at different phase change points.The material was tested by diffusion exudation circle method,scanning electron microscope and differential scan⁃ning calorimeter.The results show that the adsorption rate of composite phase change materials can reach 89.13%with⁃out leakage.Composite phase change materials have good thermal stability.These two kinds of material M-CPCMs with phase-change points in the thermal comfort zone were pressed into phase-change energy storage bricks,and the integrat⁃ed floor and ceiling were respectively constructed with cold and hot medium coils embedded in them,thus forming the ra⁃diant energy storage heating/cooling end which can store heat in steps.In this paper,a dual-active cascade utilization en⁃ergy supply mode was adopted,in which heat medium water enters the floor first and then the ceiling,and refrigerant wa⁃ter enters the floor first.Under the typical temperature conditions in winter and summer in Tianjin,the thermal perfor⁃mance of the cascade phase change radiation terminal was tested.The results show that this energy supply mode has ef⁃fectively improved the energy utilization efficiency,and the energy saving effect is remarkable.

关 键 词：梯级相变 相变材料 相变辐射末端 清洁供暖 微胶囊 

分 类 号：TB34[一般工业技术—材料科学与工程]