不同铺设材料和铺设方式对毛细管辐射系统热舒适性的影响研究

发布时间：2018-02-13 17:00

  本文关键词： 毛细管辐射系统 地面铺设材料 传热分析 数值模拟 热舒适性　出处：《东华大学》2017年硕士论文　论文类型：学位论文

【摘要】：近几年来,能源紧张不断加剧,节能问题日益成为焦点话题。建筑能耗所占总能耗的比例较大,而毛细管辐射系统温湿度独立控制的技术能够解决传统空调能源浪费的问题,毛细管辐射系统引入国内后得到了一定程度的发展,毛细管网的铺设方式和其末端所用地面铺设材料直接影响毛细管系统的使用效果,且市场上可用地面铺设材料种类众多,本文研究了地面铺设材料对毛细管末端换热的影响,并在此基础上研究了毛细管网铺设方式对房间热舒适性的影响。在研究中首先对家居装修和建材市场进行调研,选取主流地面铺设材料收集样材,主要有瓷砖、石材和木地板三大类,用第三代C-Therm TCi热导率分析仪对样材的热物性参数进行测试。利用测试数据采用Fluent模拟的方法建立地面传热模型,模拟了分别用普通型水泥砂浆和节能型水泥砂浆铺设样材时毛细管末端向地面的传热情况,得出在相同供水温度下,地面铺设材料的导热系数越高,换热能力越强,石材的换热能力最强,瓷砖次之,木地板最低。以木地板为基础,使用普通型水泥砂浆(导热系数0.75W/(m?K))时,铺设石材的地板表面温度比木地板高出8.9%~9.6%,铺设瓷砖时比木地板高出7.9%;使用节能型水泥砂浆(导热系数6W/(m?K))时,铺设石材的地板表面温度比木地板高出10%~11.78%,铺设瓷砖时比木地板高出8.59%等结论。在模拟毛细管-地面传热的基础上,再次运用Fluent模拟房间采用地面辐射采暖、墙壁辐射采暖、墙壁辐射供冷和顶板辐射供冷时室内的热环境,并利用Matlab编制PMV-PPD方程,计算室内的PMV值,评价不同铺设方式时房间的热舒适性,并得出:(1)同等采暖工况下,地板辐射采暖工况时房间的平均温度比墙壁辐射采暖时高出3℃,地板辐射采暖更容易满足室内温度要求,有利于节能。(2)用Matlab对PMV-PPD公式进行编程,计算得出地板辐射采暖时房间的PMV值为-0.1~0,墙壁辐射采暖时房间的PMV值为0~0.3,因此两种采暖房间相比条件下,地板辐射采暖的热舒适度优于墙壁辐射采暖。(3)建立房间毛细管网辐射供冷模型得出同等供冷工况下,墙壁辐射制冷时房间的温度为27~28℃,顶板辐射制冷的温度为25.5~30℃,温度梯度大,相比之下,墙壁辐射制冷房间温度分布更加均匀。(4)同等供冷工况下,墙壁辐射制冷PMV值都处于0~0.3之间,顶板辐射制冷PMV值处于0.1~0.5之间,墙壁辐射制冷能够获得更好的热舒适性。本文的研究将地面铺设材料对毛细管末端换热的影响具体化,清晰了铺设方式对室内热环境的影响,对行业设计、家居选材以及工程施工具有一定的指导意义,毛细管辐射系统整体热舒适性高,满足节能要求,能源紧张的大背景下拥有很好的发展前景。
[Abstract]:In recent years, energy tension has been increasing, and energy conservation has become a hot topic. Building energy consumption accounts for a large proportion of total energy consumption, while the capillary radiation system temperature and humidity independent control technology can solve the problem of traditional air-conditioning energy waste. The capillary radiation system has been developed to a certain extent since it was introduced into China. The laying mode of capillary net and the ground laying material used at the end of the capillary net directly affect the use effect of the capillary system, and there are many kinds of floor laying materials available in the market. In this paper, the influence of ground laying materials on the heat transfer at the end of the capillary tube is studied, and the influence of the laying mode of the capillary net on the thermal comfort of the room is studied. In the first step of the study, the domestic decoration and the building materials market are investigated. Select the mainstream floor laying materials to collect sample materials, mainly ceramic tile, stone and wood flooring three categories, The third generation C-Therm TCi thermal conductivity analyzer was used to test the thermal properties of the sample. The ground heat transfer model was established by Fluent simulation. The heat transfer from the end of the capillary tube to the ground is simulated when the common cement mortar and the energy saving cement mortar are used respectively. It is concluded that the higher the thermal conductivity of the ground laying material is, the stronger the heat transfer capacity is at the same water supply temperature. The heat transfer ability of stone is strongest, ceramic tile is the second, wood floor is the lowest. Based on wood floor, common cement mortar is used (thermal conductivity is 0.75 W / m? When laying stone, the surface temperature of stone floor is 8.9% higher than that of wood floor, and that of ceramic tile is 7.9% higher than that of wood floor. On the basis of simulating the heat transfer between capillary and ground, the surface temperature of stone floor is 10 ~ 11.78 higher than that of wood floor, and that of ceramic tile is 8.59% higher than that of wood floor. On the basis of simulating capillary-ground heat transfer, Fluent is used to simulate the floor radiation heating in the room again. The indoor thermal environment of wall radiation heating, wall radiation cooling and roof radiation cooling, and using Matlab to compile the PMV-PPD equation, calculate the indoor PMV value, evaluate the thermal comfort of the room under different laying modes, and get the same heating condition under the same heating condition. The average room temperature under floor radiation heating condition is 3 鈩，

本文编号：1508651