基于相变材料的电加热地板辐射采暖系统实验及模拟研究
发布时间：2018-08-26 16:24
【摘要】：相变材料在建筑节能方面的应用已成为建筑材料应用领域的重大课题。将相变材料应用于地板辐射采暖系统，是降低建筑采暖能耗和成本的创新途径。与传统的热水地板辐射采暖方式相比，电加热地板辐射采暖方式具有空间占用率低、前期投入较低、取暖快捷、温度控制灵活以及系统维护简单等优点，逐渐成为未来建筑供暖的发展方向。但是电是高品位能源，，电能转化为热能无论是从能源利用效率还是经济性两方面来评估都是不划算的。因此，纯电加热地板辐射采暖方式并未得到广泛的推广使用。然而，相变材料的应用完全可以解决这一矛盾，利用相变材料在夜间将“谷电”转化的热能储存起来供于建筑的采暖，以实现电力“削峰填谷”，达到经济节能和清洁取暖的目标。这将在更大程度的范围内实现节约电力能源，大范围推广清洁取暖这一目标。 本文以我国南方气候的实验条件为基础，建立基于相变材料的电加热地板辐射采暖系统的模拟试验房，并对试验房的传热过程进行合理简化，提出了模拟试验房采暖过程的二维非稳态传热模型，采用Fluent软件对该过程进行模拟计算。通过实验研究与数值模拟相结合的方式，研究了不同相变材料物性参数及操作条件对电加热地板辐射采暖系统的性能影响及规律。 研究结果表明：与无相变材料层的电加热地板辐射采暖系统相比，具有相变材料层的电加热地板辐射采暖系统不仅可以延长电热膜寿命，并且还可以实现建筑供暖热舒适及经济节能效果。实验通过比较加热时间为10000s和11800s时系统的采暖效果，得到加热时间为11800时峰值温度较高且供暖时间较长；比较加热功率为200W和220W时系统的采暖效果，得到加热功率越大升温速率越大、峰值温度越高、供暖时间越长且达到峰值温度所需的时间并不受加热功率的影响。在数值模拟研究中，通过研究不同相变材料的相变温度及相变温度区间、相变潜热值、相变材料的厚度、加热功率、环境温度及围护结构传热系数等因素对地板辐射采暖系统的影响，得出加热功率的数值模拟结果与实验结果基本一致的结论。
[Abstract]:The application of phase change materials in building energy conservation has become an important subject in the field of building materials application. The application of phase change material in floor radiant heating system is an innovative way to reduce energy consumption and cost of building heating. Compared with the traditional hot water floor radiation heating mode, the electric heating floor radiation heating mode has the advantages of low space occupancy, low early investment, quick heating, flexible temperature control and simple system maintenance. Gradually become the future direction of building heating development. However, electricity is a high grade energy, and it is not cost-effective to convert it into heat energy in terms of energy efficiency and economy. Therefore, pure electric heating floor radiation heating method has not been widely used. However, the application of phase change materials can completely solve this contradiction. The thermal energy converted from "valley electricity" can be stored by phase change materials at night for building heating, so as to realize "cutting peak and filling valley" of electric power. To achieve the goal of economic energy saving and clean heating. This will achieve the goal of saving electricity and promoting clean heating to a greater extent. In this paper, based on the experimental conditions of climate in southern China, the simulated test room of electric heating floor radiant heating system based on phase change material is established, and the heat transfer process of the test room is reasonably simplified. A two-dimensional unsteady heat transfer model is proposed to simulate the heating process in a test room. Fluent software is used to simulate the process. Through the combination of experimental research and numerical simulation, the effects of physical parameters and operating conditions of different phase change materials on the performance of radiant heating system with electric heating floor are studied. The results show that compared with the radiant heating system without phase change material layer, the radiant heating system with phase change material layer can not only prolong the life of electric heating film. And also can realize the building heating thermal comfort and economic energy-saving effect. By comparing the heating effect of the system with heating time of 1000 s and 11800 s, the results show that the heating time is 11800, the peak temperature is higher and the heating time is longer, and the heating effect is compared when the heating power is 200W and 220W, respectively. The larger the heating power, the higher the heating rate, the higher the peak temperature, the longer the heating time and the time needed to reach the peak temperature is not affected by heating power. In the numerical simulation, the phase change temperature and temperature range, the latent heat value, the thickness of phase change material, the heating power of phase change material are studied. The influence of environmental temperature and heat transfer coefficient of enclosure on the floor radiation heating system is discussed. The numerical simulation results of heating power are in good agreement with the experimental results.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU832.16
本文编号：2205477
[Abstract]:The application of phase change materials in building energy conservation has become an important subject in the field of building materials application. The application of phase change material in floor radiant heating system is an innovative way to reduce energy consumption and cost of building heating. Compared with the traditional hot water floor radiation heating mode, the electric heating floor radiation heating mode has the advantages of low space occupancy, low early investment, quick heating, flexible temperature control and simple system maintenance. Gradually become the future direction of building heating development. However, electricity is a high grade energy, and it is not cost-effective to convert it into heat energy in terms of energy efficiency and economy. Therefore, pure electric heating floor radiation heating method has not been widely used. However, the application of phase change materials can completely solve this contradiction. The thermal energy converted from "valley electricity" can be stored by phase change materials at night for building heating, so as to realize "cutting peak and filling valley" of electric power. To achieve the goal of economic energy saving and clean heating. This will achieve the goal of saving electricity and promoting clean heating to a greater extent. In this paper, based on the experimental conditions of climate in southern China, the simulated test room of electric heating floor radiant heating system based on phase change material is established, and the heat transfer process of the test room is reasonably simplified. A two-dimensional unsteady heat transfer model is proposed to simulate the heating process in a test room. Fluent software is used to simulate the process. Through the combination of experimental research and numerical simulation, the effects of physical parameters and operating conditions of different phase change materials on the performance of radiant heating system with electric heating floor are studied. The results show that compared with the radiant heating system without phase change material layer, the radiant heating system with phase change material layer can not only prolong the life of electric heating film. And also can realize the building heating thermal comfort and economic energy-saving effect. By comparing the heating effect of the system with heating time of 1000 s and 11800 s, the results show that the heating time is 11800, the peak temperature is higher and the heating time is longer, and the heating effect is compared when the heating power is 200W and 220W, respectively. The larger the heating power, the higher the heating rate, the higher the peak temperature, the longer the heating time and the time needed to reach the peak temperature is not affected by heating power. In the numerical simulation, the phase change temperature and temperature range, the latent heat value, the thickness of phase change material, the heating power of phase change material are studied. The influence of environmental temperature and heat transfer coefficient of enclosure on the floor radiation heating system is discussed. The numerical simulation results of heating power are in good agreement with the experimental results.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU832.16
【参考文献】
相关期刊论文 前9条
1 刘星;李福鹏;郭东友;;能源危机引发对电力发展的思考[J];山东电力高等专科学校学报;2010年02期
2 李国建;冯国会;朱能;胡艳军;;新型相变储能电热地板采暖系统[J];沈阳建筑大学学报(自然科学版);2006年02期
3 李峥嵘;蓄能结构传热过程的分析[J];同济大学学报(自然科学版);2001年03期
4 陈文振，程尚模，罗臻;水平椭圆管内相变材料接触熔化的分析[J];太阳能学报;1995年01期
5 仇影;吴其胜;黎水平;刘学军;荀和生;;墙体相变储能材料的研究[J];墙材革新与建筑节能;2011年11期
6 管建春,朱华,阿迪尔Ｍ．Ｓ,屠传经;储冰球相变传热数值计算及分析[J];浙江大学学报(自然科学版);1999年01期
7 吴海涛;刘秋新;;地板辐射采暖相变蓄热材料及系统形式的研究[J];制冷与空调;2010年01期
8 杨晓明;吴杲;石海军;龚毅;;我国低温热水地板辐射采暖系统的现状与发展[J];郑州轻工业学院学报;2006年04期
9 黄世斌;我国冬季室内取暖设备的现状与发展趋势[J];中国住宅设施;2003年08期
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