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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。
In order to strengthen the heat transfer in the closed heat source tower and increase the outlet temperature of the medium, the heat transfer characteristics of the finned coil, which is the key part of the closed heat source tower, are analyzed. The heat transfer equation of heat source tower is established, and the classical 4th order Runge-Kutta method is combined with MATLAB software to solve the equation. Using the solution of the equation, the temperature of the medium and the air temperature changes with the height of the heat source tower, and then change the coil diameter and fin spacing of the finned coil to calculate the medium outlet temperature under different wind speeds. The results show that: 1) Under the down flow, the heat transfer intensity at the bottom of the heat source tower is large and decreases with the height of the heat source tower. In the countercurrent mode, the heat exchange intensity varies with the height of the heat source tower; 2) The fin spacing decreases and decreases with increasing diameter and wind speed, but the decreasing amplitude increases.