双排管直接空冷换热元件性能试验研究Experimental investigation on performance of direct air-cooled heat exchanger elements of double-row tubes
万超,陈胜利,吕凯,吴润华
摘要(Abstract)：
空冷凝汽器散热器的结构是影响其性能的关键。对此,以2个不同结构尺寸的双排管直接空冷换热元件(换热元件)为例,对其热力性能进行试验研究。结果表明:随着迎面风速的增加,换热元件的传热系数及空气阻力均逐渐增大,其中传热系数的增加幅度逐渐减小,空气阻力的增加幅度逐渐增大;当迎面风速小于2m/s时,2个换热元件的换热系数基本相同;当迎面风速大于2m/s时,翅片尺寸较小的换热元件的传热系数明显大于翅片尺寸较大的换热元件,且随着迎面风速的增大,两者的差别逐渐增大;实际工程中,应对迎面风速、翅片尺寸及翅化比进行优化,以提高空冷凝汽器的热力性能。
关键词(KeyWords)： 空冷凝汽器;换热元件;传热系数;空气阻力;迎面风速;翅化比
基金项目(Foundation): 国家科技支撑计划项目(2011BAA04B02)
作者(Author): 万超,陈胜利,吕凯,吴润华
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