摘要
随着计量供热技术在我国的大力推行,低温地面辐射供暖在我国民用建筑中逐渐推广。当系统在正常的运行情况下,其供热优势是显著的,能达到舒适、节能、美观的效果。对于传统的散热器供暖系统,其供热调节已经具备完整的公式体系和调节方法,但由于地面辐射供暖与散热器供暖的末端装置和散热形式不同,二者的供热调节存在差别。
本文将针对地面辐射供暖系统的供热调节进行初步的研究,研究的内容包括对其供热调节公式的推导、系统变动的热力和水力工况分析、调节方法的选择、以及地板的热惰性对调节的影响。
首先,本文建立了地面辐射供暖系统的能量平衡方程,导出了其供热调节的基本公式,由基本公式得出了不同连接方式下不同调节方法的调节公式;由于调节的最终结果是调节地板表面散热量以保持室温恒定,因此本文建立了地板构造层的稳态传热数学模型,利用Flunent软件对其进行了模拟计算,得到了稳态传热时地板构造层的温度场,并计算了地板表面的平均温度和散热量。
其次,根据能量平衡方程式绘制了地板的热特性曲线,分析了供水温度、流量、地板表面材料以及管间距对地面散热量的影响,从而得到了适用于地面辐射供暖系统的集中调节方法。还针对地面辐射供暖的变流量特性进行了水力工况分析,证明了地面辐射供暖系统良好的个体调节性能。
最后,考虑到地板的热惰性,建立了地板构造层的非稳态传热数学模型,计算了地板传热的滞后时间,并和围护结构进行比较,得出地板的热惰性对调节的影响很小。
通过本文的研究可以得出,对于地面辐射供暖系统,采用集中质调节或分阶段改变流量的质调节方法是比较理想的,而量调节作为用户个体调节的方式是比较合理的。
With the energetically implement of heat allocate system, the radiant floor heating techonology popularizes gradually in civil architecture in our country. When system is on normal run, its advantage in heating is notable and it can achieve an effect of comfortable、energysave and beautiful. We knows that the conventional radiator heating already has a complete formula system and regulation method, but because its terminal installation and heat radiation way is different from radiant floor heating system, their heat supply regulation is different also.
A tentative research on regulation method of radiant floor heating system is carried out in this thesis, and the content contains that the deduce of regulation formula, the analysis of themal and hydraulic regime when system vary, the selection of regulation method, and the influence to heat supply regulation method of floor heat storage capacity.
Firstly, the energy balance equation is established, and the basic formula of the heat supply regulation is deduced. Then the regulation formula of different connection way and regulation method is obtained. For the final result is to regulate the heat flow rate of radiant floor and then to keep the room temperature steady, the steady-state heat transfer mathematics model of floor structure is established and the sofeware Fluent are used to simulate the regularity of temperature field. Then the heat flow rate and average temperature of floor surface is calculated.
Secondly, the thermal characteristic curve of heat floor is drawed on the basis of energy balance equation and the influence to heat flow rate of radiant floor surface by water supply, circulation flow, surface material and pipe space is analysed, then the regulation method that is appropriate for radiant floor heating system. The hydraulic regime of is analysed in view of the variable flow heating character of the system, then the good regulating performance of radiant floor heating system is proved.
Finally, unsteady heat transfer mathematics model is established considering the floor heat inertia and the time lag of floor heat transfer is calculated. A
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