基于空间扫描思想的复杂蒸发冷却式换热器通用模拟方法  

A General Modeling Approach for Complex Evaporative Cooling Heat Exchanger Based on Spatial Scanning

作　　者：李筱[1] 杨明洪[1] 李先庭[1] 石文星[1] 王宝龙[1] 

机构地区：[1]清华大学建筑学院建筑技术科学系,北京100084

出　　处：《制冷学报》2014年第4期46-52,共7页Journal of Refrigeration

基　　金：国家杰出青年基金(51125030)资助项目~~

摘　　要：针对现有蒸发冷却式换热器数值计算模型中存在的不足,提出了基于空间扫描思想的复杂蒸发冷却式换热器的通用模拟方法。该方法将三维复杂蒸发冷换热器按空间划分为若干个节点,每个节点视为独立的微型换热器,利用流体在节点之间的流动建立节点联系,根据稳定流动和稳态换热时节点之间的能量和质量守恒关系,构建迭代更新算法,利用扫描迭代的方法对模型进行求解。将无填料型和有填料两种闭式冷却塔的模拟结果与文献实验数据进行对比,结果表明:所建模型具有良好的精度,可用于复杂结构、复杂流动、多模态蒸发冷却式换热器的仿真。In order to overcome the disadvantages of existing modeling methods of the complex evaporative cooling heat exchangers, a general modeling approach based on spatial scanning theory is proposed. In this approach,the 3-D heat exchanger is divided into calculation nodes according to its spatial location. Each node is regarded as a micro heat exchanger,and connected with each other through air,water/solution, and/or refrigerant. An iterative algorithm is developed based on conservation of energy and mass of nodes in steady flow and steady-state heat transfer. Finally,the model is verified by comparing the simulated results and the experimental results of two closedtype wet cooling towers. Results show that the proposed model is highly accurate and reliable. This model can be used to simulate the performance of the evaporative cooling heat exchanger with complicated configurations and flow under different modes.

关 键 词：蒸发冷却 换热器 模拟仿真 节点 传热传质 

分 类 号：TQ051.5[化学工程] TP391.9[自动化与计算机技术—计算机应用技术]