混凝土夹心秸秆砌块墙体热湿耦合传递机制试验研究与分析

发布时间：2018-04-11 00:18

  本文选题：热湿耦合传递 + 混凝土空心砌块　； 参考：《山东农业大学》2017年硕士论文

【摘要】：建筑湿环境不但是评价建筑环境十分重要的指标,也是影响人体健康、舒适度、结构耐久性和建筑能耗等的关键因素。湿组分在建筑材料中的迁移和积累易滋生霉菌,导致室内空气品质下降,对室内空气湿度和空调的负荷特别是潜在冷却负荷有很大影响。围护结构内的湿度过高会导致表面或内部结露,出现凝结水,影响建筑材料的保温性能、寿命与美观。因此,研究围护结构的热湿传递过程具有重要意义。本文采用自行研发的可控式墙体热湿耦合试验台对混凝土夹心秸秆砌块墙体热湿耦合传递性能展开试验研究,根据墙体两侧环境的变化以及热湿传递方向的不同,将试验组分为四个方面16种工况,试验监测了沿厚度方向的两条不同路线上各测点的温度和相对湿度。试验结果显示:(1)小麦秸秆压缩块的填充阻碍了墙体内热量的传递:各试验组的温度变化曲线图显示靠近温度变化一侧墙体内温度变化较大,位于小麦压缩秸秆块中的4#测点处温度曲线变化明显。(2)墙体内湿度场的分布主要受温度梯度的影响,墙体内的热湿传递存在很强的耦合作用:热湿传递方向相同的试验组1相对湿度曲线形态变化较其在热湿传递方向相反的试验组2中明显,且其相对湿度极差、各测点含湿量明显大于试验组2。(3)小麦秸秆压缩块的填充阻碍了湿度的传递:相同热湿传递方向时,环境温度、相对湿度的变化分别对墙体内含湿量、相对湿度的影响较大,环境的变化对靠近该侧的墙体的影响较大,而远离该侧墙体的相对湿度、含湿量变化很小。(4)墙体内的热湿迁移存在着很强的耦合作用:墙体两侧的温差越大墙体内各测点温度达到平衡的时间越长,环境相对湿度对墙体内湿组分分布的影响速度缓慢。采用课题组自行研发的复合墙体热湿耦合传递模拟软件HMCT1.0对试验工况进行了模拟,结果显示各试验组温度与相对湿度试验值与模拟值的变化趋势基本一致,模拟温度与试验温度的平均偏差0.9℃左右,基本吻合;试验组1中模拟相对湿度与试验结果平均偏差6.8%左右,而试验组2中平均偏差11%左右,相对湿度产生偏差的主要原因是墙体内的初始相对湿度较高。
[Abstract]:Building wet environment is not only a very important index to evaluate the building environment, but also a key factor affecting human health, comfort, structural durability and building energy consumption.The migration and accumulation of wet components in building materials can easily breed mold, which leads to the decline of indoor air quality, which has great influence on indoor air humidity and air conditioning load, especially the potential cooling load.The high humidity in the enclosure structure will lead to condensation on the surface or inside, which will affect the thermal insulation, service life and beauty of the building materials.Therefore, it is of great significance to study the heat and moisture transfer process of the envelope structure.In this paper, the heat and humidity coupling transfer performance of the concrete sandwich straw block wall is studied by using the controllable thermal-humidity coupling test bed developed by ourselves. According to the change of the environment on both sides of the wall and the different direction of heat and moisture transfer, the heat and moisture transfer performance of the concrete sandwich straw block wall is studied.The test group was divided into four aspects and 16 working conditions. The temperature and relative humidity of each point along two different routes along the thickness direction were monitored.The results showed that the filling of wheat straw compressing block hindered the heat transfer in the wall.The distribution of humidity field in the wall is mainly affected by the temperature gradient.The heat and humidity transfer in the wall has a strong coupling effect: the relative humidity curve of test group 1 with the same direction of heat and humidity transfer direction is more obvious than that in test group 2 with the opposite direction of heat and humidity transfer direction, and its relative humidity is extremely poor.The moisture content of each measuring point is obviously larger than that of the test group (2. 3) the filling of wheat straw compressing block hinders the transfer of humidity: when the heat and moisture transfer direction is the same, the changes of environment temperature and relative humidity have a great influence on the moisture content and relative humidity in the wall, respectively.The change of environment has a great influence on the wall near this side, but far away from the relative humidity of the wall on the side.There is a strong coupling effect between heat and moisture transfer in the wall. The larger the temperature difference between the two sides of the wall is, the longer the temperature reaches equilibrium, and the slower the influence of relative humidity on the distribution of wet components in the wall is.The experimental conditions are simulated by using the thermal-humidity coupling transfer simulation software HMCT1.0 developed by the research group. The results show that the temperature and relative humidity values of each test group are basically the same as the simulated values.The average deviation between the simulated temperature and the test temperature is about 0.9 鈩，

本文编号：1733587