横流闭式冷却塔的微分方程及其解法(上)  

Differential equations and solutions of closed cross-flow cooling towers(Part 1)

作　　者：李宁瑾[1] 曹长 

机构地区：[1]中机十院国际工程有限公司深圳分公司 [2]深圳晓清水务有限公司

出　　处：《制冷与空调》2015年第8期28-34,20,共8页Refrigeration and Air-Conditioning

摘　　要：提出横流闭式冷却塔的基本微分方程及其差分解法与分段积分解法,并通过设计计算实例对影响横流闭式冷却塔冷却能力的诸因素进行分析,对横流闭式冷却塔与逆流闭式冷却塔进行比较,也对多层结构型横流闭式冷却塔与双层结构型横流闭式冷却塔进行比较。结果表明:在具有相同的盘管结构与体积、相同的传热与散质能力及相同的运行条件下,双层结构的横流闭式冷却塔具有比逆流闭式冷却塔更大的冷却能力;在同等盘管体积与水膜填料体积及相同的运行条件下,多层结构的横流闭式冷却塔具有比双层结构的横流闭式冷却塔更大的冷却能力。同时也表明这种计算模型与方法具有较高的计算精度,适用于各种设计计算与试验资料整理的实际应用。The basic differential equations of closed cross flow cooling towers are put forward as well as their difference solutions and segmented-integration solutions. Various factors influencing the closed cross-flow cooling towers＇ cooling capacity are analyzed through design calculation examples. The closed cross-flow and closed counter flow cool- ing towers are compared. Besides, multi-layer structure and double-layer structure closed cross-flow cooling towers are compared. The results show that double-layer structure closed cross-flow cooling towers have larger cooling capacity than closed counter-flow type under the same coil structure, volume, heat transfer and bulk transfer capacity, as well as the same operation condition. Under the same coil volume, volume of water film packing and operation condition, multi layer structure closed cross-flow cooling towers have larger cooling capacity than double-layer structure. They also show that the computational model and method has a high accuracy, which can be applied to various practical applications of design calculations and experimental data compilation.

关 键 词：闭式冷却塔 横流式 微分方程 差分解法 分段积分解法 

分 类 号：TQ051.5[化学工程]