毛细管地板辐射供暖特性研究

发布时间：2018-04-02 13:27

本文选题：毛细管辐射采暖系统　切入点：供热参数　出处：《南京理工大学》2014年硕士论文

【摘要】：随着社会现代化进程的加快,能源消耗呈指数增长。而建筑能耗中,北方集中供暖约占总能耗的1/4,东北、西北、华北地区属严寒和寒冷地区,办公建筑、商用建筑、居住建筑等必须设计室内供暖系统,在城镇住宅能耗(除北方集中供暖)中夏热冬冷地区供暖能耗也呈现成倍增长的趋势。因此,响应国家“节能减排”政策的号召,发展新型节能供暖方式,对缓解我国能源紧缺有重要意义。毛细管地板辐射供暖作为一种新型供暖方式,供水温度低,热源端节能优势明显,目前,对毛细管辐射供暖的研究并不多,本文主要工作为毛细管地板辐射供暖的敷设结构优化及系统的节能分析。首先对毛细管在地板层下的传热过程作出适当假设,将三维传热模型简化为二维传热模型,同时假设系统连续运行,地板内部的温度场为稳态,根据稳态导热方程及边界条件,建立控制方程组。再将计算区域划分为有限个小单元体,根据元体热平衡法法计算出每个网格节点的节点方程,建立节点方程组。采用高斯迭代法,以MATLAB软件编制计算程序。由上述程序计算当供回水平均温度、管间距、埋深厚度、管径及面层等供热参数在一定范围内变化时,地板表面的温度分布及平均热流密度。根据建立的各供热参数与地板表面温度、平均热流密度的关系图,得到满足室内要求的最优结构。最后,以上海市某住宅小区为例,BIN表为依据,计算室外空气温度及负荷率变化时,机组的制热系数(COP)及能耗。同样以BIN表为依据,计算负荷率变化时,变流量水泵的功耗。由上述计算方法分别得到三种运行方案的总能耗,选择合适的供水温度使得毛细管地板辐射采暖系统能耗达到最低,并进一步将该系统与普通低温热水地板辐射供暖系统进行比较分析其节能性。
[Abstract]:With the accelerated process of social modernization, energy consumption grows exponentially. The building energy consumption, the north central heating accounts for about 1/4 of the total energy consumption, the northeast, northwest, North China is cold and the cold area, office buildings, commercial buildings, residential buildings and other indoor heating system design must supply in urban residential energy consumption (except in north central heating) heating energy consumption in summer and cold winter region also showed exponential growth trend. Therefore, in response to the national "energy-saving emission reduction" policy on the development of new energy saving heating mode, to ease China's energy shortage has important significance.
Capillary floor radiant heating, as a new heating mode, has low water supply temperature and obvious advantages of energy saving at the end of heat source. At present, there are not many researches on capillary radiant heating. The main work of this paper is the optimization of laying structure and energy saving analysis of capillary floor radiant heating system.
First, make appropriate assumptions on the heat transfer process of capillary in the floor of the three-dimensional heat transfer model was simplified to a two-dimensional heat transfer model, the assumption of continuous operation of the system, the temperature field inside the floor for the steady, according to the steady-state heat conduction equation and boundary conditions, establish the control equations. Then the calculation area is divided into small finite element calculation a node equation of each grid node according to the element heat balance method, set up the node equations. Using Gauss iterative method, using MATLAB software program.
When the average temperature of supply and return water pipe spacing, by the calculation, buried depth, diameter and surface heating parameter changes within a certain range, the temperature distribution of the floor surface and the average heat flux density. Based on the different heating parameters and the floor surface temperature, the average heat flux density diagram, get optimal the interior structure requirements.
Finally, a residential area in Shanghai city as an example, the BIN table based on the calculation of the outdoor air temperature and load rate changes, the heating coefficient of the unit (COP) and energy consumption. Similarly to the BIN table according to the calculated load change rate, power consumption of variable flow pump. By the above method respectively to obtain the total the energy consumption of three kinds of running the program, select the appropriate water temperature makes the energy consumption of floor radiant heating system capillary reached the lowest level, and further comparative analysis of the energy saving of the system and the general system. Low temperature hot water floor radiant heating

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU832

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