摘要
【目的】建立传热数学模型,模拟探究一种以脂肪酸共晶混合物为相变材料的地采暖用相变储能地板,为新型地采暖储能地板的开发和应用提供理论基础。【方法】利用差示扫描量热法(DSC)和步冷曲线法分析脂肪酸共晶混合物的热性能,应用DSC和傅里叶红外(FTIR)分析其化学性质和热循环稳定性,确定脂肪酸共晶混合物对地采暖地面环境的适用性,选择脂肪酸共晶混合物作为相变储能地板用相变材料。建立并求解铺设脂肪酸相变地板的电加热地采暖系统传热数学模型,分析其节能性能和供热效果。具体过程为:首先,选择常用的典型房间理论模型,分析地采暖运行条件下室内热动态过程,并设定日夜间歇式地采暖运行模式;然后,建立房间传热模型,计算理论房间冬季室内供暖热负荷,确定相变材料用量以及地板表面与室内空气的换热关系;最后,建立地板传热模型,利用ANSYS软件模拟地采暖间歇式运行模式下脂肪酸相变地板的储放热过程,并观察室内空气温度和地板表面温度的变化规律,分析基于脂肪酸相变地板的电加热地采暖系统的节能性能与供热效果。【结果】脂肪酸共晶混合物相变温度在20～30℃之间,满足地采暖地面环境和人体舒适温度要求;脂肪酸共晶混合物熔程仅2～3℃,供热过程室内温度变化小;脂肪酸共晶混合物化学性质稳定,经过1 500次冻熔循环后熔点和潜热变化仅为0.27℃和1.7%,热循环稳定性突出,可满足在地采暖环境中长时间应用。以脂肪酸共晶混合物为相变材料的相变储能地板应用于地采暖环境中,可实现利用夜晚8 h储热、白天16 h放热的稳定供暖模式,将白天的用电负荷转移至夜晚,达到"移峰填谷"式节能用电目的,同时可将室内空气和地板表面温度控制在人体适宜范围内。【结论】脂肪酸相变地板用于电加热地采暖系统中,供暖和节能效果理想�
【Objective】In order to provide theoretical bases for the development and application of a new kind phase change energy storage floor used in ground with heating system, the thermal performance of phase change energy storage floor using fatty acid eutectic mixture as phase change material was investigated by a heat transfer mathematic model of ground with heating system in this study.【Method】 Differential scanning calorimetry（DSC）and step cooling curves were used to analyze the thermal properties of eutectic mixtures of fatty acids. The chemical properties and thermal cycling stability was tested by DSC and Fourier transform infrared（FTIR）. The applicability of fatty acid eutectic mixture to the ground of ground with heating system was confirmed, and the fatty acid eutectic mixture was selected as the phase change material for the phase change energy storage floor. The energy saving performance and heating effect of phase change energy storage floor was analyzed by a heat transfer mathematic model of electric ground with heating system. Firstly, the theoretical model of a typical room was chosen and the thermal dynamic process of ground with heating system was described. The operation of ground with heating system was set to a batch-type. Then, the heat transfer model of the room was established, the heat load was calculated, and the amount of phase change material and the heat transfer relationships between floor surface and indoor were confirmed. The heat transfer model of floor was lastly established, and the heat storage and release process of phase change energy storage floor was analyzed using ANSYS software. The changes of indoor temperature and floor surface temperature were observed, and the energy saving performance and heating effect of the electric floor heating system based on the phase change energy storage floor of fatty acid were analyzed.【Result】 The phase change temperature of the fatty acid eutectic mixture was between 20-30 ℃, which satisfies the temperature requirements o
作者
邢靖晨
周玉成
虞宇翔
李露霏
常建民
Xing Jingchen;Zhou Yucheng;Yu Yuxiang;Li Lufei;Chang Jianmin(College of Material Science and Technology,Beijing Forestry University Beijing 100083;School of Information and Electrical Engineering,Shandong Jianzhu University Jinan 250101)
出处
《林业科学》
EI
CAS
CSCD
北大核心
2018年第11期20-28,共9页
Scientia Silvae Sinicae
基金
泰山学者优势特色学科人才团队(2015162)
关键词
地板采暖
相变储能
脂肪酸
传热模型
ANSYS模拟
floor used for ground with heating system
phase change energy storage
fatty acid
heat transfer model
ANSYS simulation
