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Thermal tests of large recirculation cooling installations for nuclear power plants

机译：核电站大型再循环冷却装置的热测试

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摘要

The article presents the results from thermal tests of some recirculation installations for cooling air in nuclear power plant premises, including the volume under the containment. The cooling effect in such installations is produced by pumping water through their heat-transfer tubes. Air from the cooled room is blown by a fan through a bundle of transversely finned tubes and is removed to the same room after having been cooled. The finning of tubes used in the tested installations was made of Grade 08Kh18N10T and Grade 08Kh18N10 stainless steels or Grade AD1 aluminum. Steel fins were attached to the tube over their entire length by means of high-frequency welding. Aluminum fins were extruded on a lathe from the external tube sheath into which a steel tube had preliminarily been placed. Although the fin extrusion operation was accompanied by pressing the sheath inner part to the steel tube, tight contact between them over the entire surface was not fully achieved. In view of this, the air gap’s thermal resistance coefficient was introduced in calculating the heat transfer between the heat-transferring media. The air gap average thickness was determined from the test results taking into account the gap variation with temperature due to different linear expansion coefficients of steel and aluminum. These tests, which are part of the acceptance tests of the considered installations, were carried out at the NPO TsKTI test facility and were mainly aimed at checking if the obtained thermal characteristics were consistent with the values calculated according to the standard recommendations with introduction, if necessary, of modifications to those recommendations.
机译：本文介绍了一些用于核电站场所冷却空气的再循环装置的热测试结果，包括安全壳下的容积。在此类设备中，通过将水泵送通过其传热管来产生冷却效果。来自冷却室的空气被风扇吹过一束横向翅片管，冷却后被排出到同一房间。在测试安装中使用的管的翅片由08Kh18N10T级和08Kh18N10级不锈钢或AD1级铝制成。钢鳍通过高频焊接在管的整个长度上固定。将铝翅片从预先放置有钢管的外管护套挤出到车床上。尽管翅片挤压操作伴随着将护套内部部分压向钢管，但是它们之间在整个表面上的紧密接触仍未完全实现。有鉴于此，在计算传热介质之间的传热时引入了气隙的热阻系数。空气间隙的平均厚度是根据试验结果确定的，其中考虑到由于钢和铝的线性膨胀系数不同而导致的间隙随温度的变化。这些测试是所考虑装置的验收测试的一部分，它们是在NPO TsKTI测试设施上进行的，主要目的在于检查所获得的热特性是否与根据介绍中的标准建议计算出的值一致，如果对这些建议进行必要的修改。

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  • 来源
    《Thermal engineering》 |2017年第11期|856-863|共8页
  • 作者

    Balunov Boris F.; Lychakov V. D.; Il’in V. A.; Shcheglov A. A.; Maslov O. P.; Rasskazova N. A.; Rakhimov R. Z.; Boyarov R. A.;

  • 作者单位

    Polzunov Research and Production Association for Investigation and Design of Power Generating Equipment (NPO TsKTI), St. Petersburg, Russian Federation;

    Polzunov Research and Production Association for Investigation and Design of Power Generating Equipment (NPO TsKTI), St. Petersburg, Russian Federation;

    Polzunov Research and Production Association for Investigation and Design of Power Generating Equipment (NPO TsKTI), St. Petersburg, Russian Federation;

    Polzunov Research and Production Association for Investigation and Design of Power Generating Equipment (NPO TsKTI), St. Petersburg, Russian Federation;

    EnergomashKapital, Moscow, Russian Federation;

    EnergomashKapital, Moscow, Russian Federation;

    BASET Research and Production Enterprise, Tuimazy, Bashkortostan, Russian Federation;

    BASET Research and Production Enterprise, Tuimazy, Bashkortostan, Russian Federation;

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  • 正文语种 eng
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  • 关键词

    finned tubes; heat transfer from the finned tube external surface; recirculation cooling installation; thermal contact resistance;

    机译：翅片管;从翅片管外表面传热;循环冷却安装;热接触电阻;

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