蒸发式空冷器低密度翅片管束干工况换热及阻力特性

建立了工业用8排翅片管束空冷实验装置，讨论了翅片管干式空冷代替光管湿式空冷的可行性，研究低进口风温、风量对翅片管干式空冷换热的影响。实验结果表明：低进口风温下，翅片管干式空冷可用来代替光管湿式空冷换热，降低进口风温能有效强化翅片管干式空冷换热，其换热能力亦随着配风量的增加而提高。实验中翅片管管外换热系数和管束压降实验值与国外关联式计算结果有差别，拟合给出本实验翅片管管外传热关联式及管束压降关联式，为工业应用设计提供依据。

Heat Transfer and Resistance Characteristics of Evaporative Air Cooler with Low Density Finned Tube Bundles under Dry Condition

The air-cooled experimental device with 8-row industrial finned tube bundle was established,and the feasibility of using dry air cooling with finned tubes to substitute wet air cooling with smooth tubes was discussed.Meanwhile,the influence of low inlet air temperature and air flow on the dry air-cooled heat transfer performance is studied.The experimental results show that the dry air cooling of the finned tubes can be used to replace the wet air cooling of the smooth tubes under low inlet air temperature condition,reducing the inlet air temperature can effectively enhance the air-cooled heat transfer performance of the finned tubes,and the heat transfer capacity of the finned tubes increases with the increment of air distribution.In the experiment,the external heat transfer coefficient of the finned tubes is different from that of the foreign correlation calculation.The correlations of the heat transfer and the pressure drop of the tube bundles are given,which provide the basis for practical application in industry.