梯级相变地暖系统传热特性仿真分析  

Simulation analysis of heat transfer characteristics of cascade phase change floor heating system

作　　者：马颖[1] 石柳 何晓祥 左青松 陈莹 杨姮 魏荣荣 MA Ying;SHI Liu;HE Xiaoxiang;ZUO Qingsong;CHEN Ying;YANG Heng;WEI Rongrong(School of mechanical engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105

出　　处：《中南大学学报（自然科学版）》2022年第12期4741-4748,共8页Journal of Central South University:Science and Technology

基　　金：湖南省自然科学基金资助项目(2020JJ5539,2021JJ40536)。

摘　　要：针对相变地暖地板表面温度不均匀问题,以蓄热过程相变材料发生固-液相变时的温度场分布特征为依据,提出一种新型梯级相变地暖系统,相变蓄热层的远热源区域采用相变温度较低的相变材料,近热源区域采用相变温度较高的相变材料。建立传热分析模型,比较采用单一相变材料作为相变蓄热层的普通相变地暖与梯级相变地暖的热性能,分析相界面、温度场的演化过程。研究结果表明:相对于普通相变地暖,梯级相变地暖兼具温度均匀与保温时间长的优点,能提供稳定的热流密度,地板表面的最大温差降低了61.73%,保温时间延长了48.15%。In order to solve the problem of uneven surface temperature of PCM floor, a new type of cascade PCM floor heating system was proposed based on the temperature field distribution characteristics of solid-liquid phase change materials during heat storage process. The PCM with lower phase transition temperature was used in the area away from heat sources of phase change heat storage layer, and the PCM with higher phase transition temperature was used in the area close to heat source. A heat transfer analysis model was established, and the thermal performance of ordinary phase change floor heating using a single phase change material as a phase change heat storage layer was compared with that of cascade phase change floor heating, and the evolution process of phase interface and temperature field was analyzed. The results show that, compared with the ordinary phase change floor heating, the cascade phase change floor heating has the advantages of uniform temperature and long holding time, which can provide stable heat flux. The maximum surface temperature difference of the floor surface is reduced by 61.73%, and the holding time is extended by 48.15%.

关 键 词：相变地暖 梯级 温度均匀性 保温时间 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]