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finned tube bundles
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  finned tube bundles
Investigation of the total energy (heat and power) performance of finned tube bundles in crossflow of air
      
The authors presented results of experimental investigations of heat transfer with film condensation of practically motionless vapor in finned tube bundles of different geometry.
      
Influence of irrigation density on heat transfer during condensation in finned tube bundles
      


The overall heat transfer around a set of horizontal finned tube bundle exposed to an upstream crossflow of a water-in air mist spray has been determined experimentally. Results indicate that with increasing water spray capacity, the heat transfer coefficients of the two components mist spray could be two times as high as those of single component (air) flow. An Mechanismic modle of simultaneous heat and mass transfer considering wetness factor is also proposed.

本文进行了在干式空冷器上直接由下方喷雾强化翅片管外侧散热的实验研究。讨论了喷水强度,风速,热流体温度,翅管排列结构等参数的影响。结果表明,随喷水强度增大,管外侧传热系数可增加100%以上。

The concept of separated flow and numerical calculation of two-dimensional unsteady heat transfer were used to develop a model of the temperature change of flue gas flowing out of finned tube bundles. A method for comparison was designed to improve the separated flow model and the transient experiment method. The heat transfer coefficient of air flowing transversly through crossed finned tube bundles was established in this way and experimental study on the coefficient was made with the constant...

The concept of separated flow and numerical calculation of two-dimensional unsteady heat transfer were used to develop a model of the temperature change of flue gas flowing out of finned tube bundles. A method for comparison was designed to improve the separated flow model and the transient experiment method. The heat transfer coefficient of air flowing transversly through crossed finned tube bundles was established in this way and experimental study on the coefficient was made with the constant wall temperature method. The result was satisfactory.

利用离散流动的概念和二维非稳态传热的数值计算方法,建立了流体从翅片管束换热器流出时温度变化的计算模型,并设计了配比方法,使离散流动瞬态法有了较大的改善.本文用该方法确定了空气横掠大管径错排翅片管束的换热系数,同时还用恒壁温法对该管束的换热系数进行了试验研究,二者结果符合很好.

The service life of a low pressure waste heat boiler for H2SO4 plant was prolonged by improving quality of feed water, regular blowdown, use of thick-wall finned tube bundle with wearing ring at elbows for vapourizer, and operating fluidized bed roaster under dark brown-cinder condition.

提高软水的制作质量并定时排污,采用厚壁铜管的蒸发管束,且弯头处加焊防磨环,直管处焊翅片,另一方面,严格保持硫酸沸腾炉矿灰颜色为深棕色,从而延长低压废热锅炉蒸发管束的使用周期,使低压废热利用获得良好的经济效益。

 
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