热管与墙体结合的散热装置热工性能研究

发布时间：2019-01-05 00:11

【摘要】：低温供暖技术是近年来逐渐推广的供暖新趋势，与传统的高温供暖方式相比,具有低能耗、高舒适性的特点。随着供回水温度的降低，供暖末端装置势必要有相应的变化，需具备更优的传热特性。因此，可将重力式热管这种高效传热元件应用于建筑一体化供暖系统中，达到以低耗能取得较为满意的室内热环境的效果。 本课题对重力式热管与墙体结合的散热装置展开研究。首先对重力式热管的传热模式进行分析，分别建立其与户内内墙、户间隔墙及外墙相结合的重力式热管散热装置的物理模型和数学模型。其次使用Matlab对不同供回水平均温度下各形式传热模型的壁面温度分布及散热量进行模拟计算。最后通过实验，分别测得散热器明装、混凝土覆盖、模拟内墙及同热流密度外墙的单位面积散热量，用实验结果验证模拟计算方法的可靠性及准确性。 通过调整与户内内墙结合的重力式热管散热装置双侧粉饰层的厚度比，可灵活实现内墙对不同负荷的双侧房间同时供暖；与外墙结合的重力式热管散热装置随着供回水平均温度升高，散热损失百分下降；在外墙加设内保温层时，散热损失量明显减少。实验表明：当过余温度为64.5℃、供回水温差为13℃时，安装每平米重力式热管散热器的散热量为1419.2W。相同过余温度下，，该散热装置可不考虑流量对散热量的影响。保证与热管结合的墙体的各个构造层厚度一致，墙体表面就会有很好的温度均匀性。最后通过对实验数据的整理归纳，结合模拟计算给出溴锂-碳钢重力式热管散热装置的使用推荐表，为其工程应用提供参考依据。 本论文为“十二五”国家科技支撑计划课题“严寒地区供热系统节能降耗关键技术研究与工程示范”（2011BAJ05B04）的部分研究内容。
[Abstract]:Low temperature heating technology is a new trend of heating which is gradually popularized in recent years. Compared with the traditional high temperature heating method, it has the characteristics of low energy consumption and high comfort. With the decrease of the temperature of water supply and return water, the heating terminal equipment must have corresponding changes, and it needs to have better heat transfer characteristics. Therefore, gravity heat pipe, which is an efficient heat transfer element, can be applied to the integrated building heating system to achieve a satisfactory indoor thermal environment with low energy consumption. In this paper, the heat dissipation device of gravity heat pipe combined with wall is studied. Firstly, the heat transfer model of gravity heat pipe is analyzed, and the physical model and mathematical model of gravity heat pipe heat dissipation device are established, which are combined with interior wall, indoor wall and external wall respectively. Secondly, Matlab is used to simulate the wall temperature distribution and heat dissipation of various heat transfer models under different average temperature of water supply and return water. Finally, the unit area heat emission of radiator, concrete covering, simulating inner wall and external wall with same heat flux are measured by experiments, and the reliability and accuracy of the simulation calculation method are verified by the experimental results. By adjusting the thickness ratio of the double side whitewash layer of the gravity heat pipe heat dissipation device combined with the interior wall, it can flexibly realize the simultaneous heating of the inner wall to the bilateral rooms with different loads. The heat dissipation loss of gravity heat pipe combined with external wall decreases with the increase of the average temperature of water supply and backwater, and the heat loss decreases obviously when the inner insulation layer is added to the external wall. The experimental results show that when the excess temperature is 64.5 鈩

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