自动除污型污水-水换热器的数值模拟

Analysis of Sewage-water Heat Exchanger with the Function of Auto-de-fouling

针对污水源热泵污水侧除污问题,提出并设计了一种具有自动除污功能的壳管式换热器。基于分布参数法对其建立了稳态数学模型。采用矩阵控制的方法求解模型,并对其除污前后不同的污水、循环水流量,不同的换热面积下两侧流体的温度分布进行了研究。结果表明,当换热器面积设计偏大时会出现局部热量反交换现象,并指出了多发区。将除污功能应用于壳管式换热器,相应地减小换热器的体积,可使壳管式污水-水换热器在最佳工况下运行。

A sewage-water shell-tube heat exchanger with the function of de-fouling was proposed and designed for sewage-source heat pump.Its new simulation program which relies on a distribution parameter computational method was set up.Then the model was solved with the method of Matrix Control.Based on the model,the distribution of bilateral fluid temperature were studied,under the conditions of different flow rates and heat exchange area before and after the de-fouling.Results showed that there will be heat anti-transfer phenomenon if the heat exchanger area is bigger than need and the region of this phenomenon was point out.Setting the function of auto-de-fouling in shell-tube heat exchanger and reducing the equipment＇s volume accordingly can make the sewage-water heat exchanger run in the best conditions.