单排管直接空冷换热元件性能试验  

Experimental investigation on performance of single-row-tube direct air-cooling heat exchanger elements

作　　者：陈胜利[1] 吕凯[1] 荆涛[1] 李高潮[1] 万超[1] 

机构地区：[1]西安热工研究院有限公司,陕西西安710032

出　　处：《热力发电》2014年第11期83-86,共4页Thermal Power Generation

基　　金：国家科技支撑计划项目(2011BAA04B02)

摘　　要：为了探究结构参数对空冷元件流动传热特性的影响规律,为空冷凝汽器优化选型提供参考,通过实验室性能试验,研究不同结构尺寸的单排管直接空冷换热元件的热动力性能。结果表明:迎面风速增加,单排管空冷元件传热系数增大,空气阻力亦随之增大;在元件结构参数基本相同的前提下,迎面风速一定,随着翅片厚度减小,空气阻力降低,换热效果增强。据此,将单排管空冷元件与双排管空冷元件的流动换热特性进行技术对比,发现在工程设计常用的迎面风速下,单排管空冷元件与双排管空冷元件的换热系数相当,而单排管空冷元件的阻力明显小于双排管。This paper aimed to explore the emphasis law of structure parameter on flow and heat transfer characteristics of the direct air-cooling heat exchanger elements and put forward guiding references for op-timization design for air-cooling condensers.The thermodynamic performance of single-row-tube direct air-cooling heat exchanger elements with different structural parameters was experimentally studied in labora-tory scale.The results show that,the heat transfer coefficient and the air resistance increased with the fa-cing velocity.On the premise of the elements structural parameters were basically the same,with a constant facing velocity,the air resistance decreased and the heat transfer coefficient increased with the decreasing fin thickness.Thus,the flow and heat transfer characteristics of the air-cooling elements of single-row-tube and double-row tube were compared.It finds that,within the range of facing velocity that engineering de-sign commonly used,the heat transfer coefficient of the above two types of elements was almost equiva-lent,while the air resistance of the single-row-tube air-cooling elements was significantly smaller than that of the double-row-tube air-cooling elements.

关 键 词：直接空冷凝汽器 换热元件 单排管 空气阻力 换热系数 

分 类 号：TK264.11[动力工程及工程热物理—动力机械及工程]