利用寒冷空气自然冷量的翅片管式换热器设计与分析

Design and analysis of a finned tube heat exchanger using natural cooling in the cold air

为了充分利用我国西北地区冬季丰富的自然冷量,设计了能够利用冷空气对盐水降温的翅片管式换热器。对换热器进行了结构设计,采用计算流体动力学Fluent软件对换热器空气侧的温度场和速度场进行了模拟,分析了空气流量和盐水流量变化对传热性能的影响。结果表明:当环境温度变化时,换热器空气侧的温度场和速度场整体分布较为均匀;总传热系数随空气流量和盐水流量的增加而增大,但幅度越来越小;实际换热量随空气流量的增加先增大后减小,随盐水流量的增加逐渐增大,但幅度越来越小。

In order to make full use of natural cooling in winter in the northwest region,a finned tube heat exchanger was designed,which could use natural cooling in the cold air to decrease the salt water temperature.The structure of the heat exchanger was designed.The temperature and velocity field of the heat exchanger in air side was simulated by using the FLUENT software of calculation fluid dynamics,and then the effect for heat transfer performance was analyzed with the change of the air or water flow rate.The results showed that as the environmental temperature changed,the temperature and velocity field distribution of the heat exchanger in air side was relatively uniform.With the increase of salt water and air flow rate,the total heat transfer coefficient gradually increased,but the increase rate was getting smaller and smaller.With the increase of air flow rate,the actual heat exchange capacity first increased and then decreased.With the increase of salt water flow rate,the actual heat exchange capacity gradually increased,but the increase rate was getting smaller and smaller.