冬季干工况下闭式热源塔传热特性分析  

Analysis and study of the heat transfer characteristics of closed heat source tower in winter dry working conditions

作　　者：黄从健[1] 李念平[1] 申小杭[1] 王廷伟[1] 樊晓佳[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《安全与环境学报》2013年第6期96-100,共5页Journal of Safety and Environment

基　　金：国家十二五科技支撑计划项目(2011BAJ03B05-6);长沙市科技计划项目(K1104010-11)

摘　　要：为了强化闭式热源塔内的传热,提高介质出口温度,对闭式热源塔的关键部位——翅片盘管进行传热特性分析。建立了热源塔传热方程,用经典4阶Runge-Kutta方法结合MATLAB软件求解方程。利用方程的解得到介质和空气温度随热源塔高度的变化情况,然后改变翅片盘管的盘管管径和翅片间距,计算不同风速下的介质出口温度。结果表明:1)顺流式下,热源塔底部换热强度大且随热源塔高度升高而减小,逆流式下,随热源塔高度变化换热强度几乎不变;2)介质出口温度随翅片间距减小而减小,随管径和风速增加而增加,但增加幅度逐渐减小。This paper is inclined to bring about an analysis and study of the heat transfer characteristics of sealedtype heat source tower in winter dry working conditions. In this paper, we have analyzed the heat transfer characteristics of the key parts of the closed heat source tower^fin coil in hoping to strengthen the heattransfer intensity of such heat source towers and increase the medium outlet temperature to improve the efficiency of its heating pumps＇ work. It is for this re search purpose that we have established the heat transfer equation of such heat source towers and solved it by using the classical fourthor der RungeKutta method combining the MATLAB software. The heat transfer equation worked out by us is verified with the practical calcu lation results in perfect conformity with the experimental data. We have also arrived at the medium and air temperature curves along with the height of such towers under the parallel flow working conditions and counter flow working condition in accordance with the equation. And now we have determined the medium outlet temperature under the different working conditions in different coil diameters, different fin pitches and different air velocities. The study results of this paper can be shown as follows： （1） The heat transfer intensity is larger at the bottom of the closed heat source tower than that at the top under parallel flow working condition, but under that counterflow, the heat transfer intensity won＇ t change in the direction of the height of the tower. However, the outlet medium temperature counterflow working condition is O. 19 % higher than that under parallel flow working con dition. （2） The medium outlet temperature tends to decrease while the fin pitch decreases. But the medium outlet temperature＇increases as the air velocity increases, though the increase gradually decreases. （3） With the increase of the diameter and air velocity, the medium outlet temperature would increase, too, though the increase gradually decreases. In addition, a bet

关 键 词：市政工程 传热方程 翅片间距 盘管管径 传热特性 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]