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首页> 外文期刊>Heat Transfer Engineering >Heat Rejection in Condensers Close to Critical Point-De-Superheating, Condensation in Superheated Region, and Condensation of Two-Phase Fluid
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Heat Rejection in Condensers Close to Critical Point-De-Superheating, Condensation in Superheated Region, and Condensation of Two-Phase Fluid

机译：接近临界点减过热的冷凝器中的排热，过热区域中的冷凝和两相流体的冷凝

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摘要

Conventional modeling of condensers typically assumes three zones: de-superheating, condensation, and subcooling zone, even though it is clear that condensation occurs in the de-superheating zone at some conditions and subcooling occurs during condensation. This article discusses the actual situation and provides experimental validation of the hypothesis. The experimental results show heat transfer coefficients (HTC) of CO_2 and R410A at mass fluxes from 100 to 240 kg m~(-2) s~(-1), heat fluxes from 3 to 25 kW m(-2), and reduced pressures from 0.68 to 1.00 in a horizontal smooth tube of 6.1 mm inner diameter. Data are compared to correlations proposed for other working fluids or other conditions. Results show much higher values of HTC than the correlation proposed for single-phase turbulent flow in the superheat zone. The occurrence of condensation in the superheat zone is evident when tube wall temperature is below saturation temperature. The results suggest that simplified calculations of heat rejection in a superheated zone could oversize condensers. The semi-empirical correlation, which is here proposed as the combination of existing correlations for single-phase turbulent and saturated condensation, satisfactorily predicts HTC of the superheat zone condensation.
机译：冷凝器的常规建模通常假设三个区域：过热，冷凝和过冷区域，即使很明显在某些条件下在过热区域中会发生冷凝，冷凝时也会发生过冷。本文讨论了实际情况，并提供了假设的实验验证。实验结果表明，CO_2和R410A在100至240 kg m〜（-2）s〜（-1）的质量通量，3至25 kW m（-2）的热通量下的传热系数（HTC）减小了。内径为6.1 mm的水平光滑管中压力从0.68到1.00。将数据与为其他工作流体或其他条件建议的相关性进行比较。结果显示，HTC的值比过热区中单相湍流所建议的相关性高得多。当管壁温度低于饱和温度时，就会在过热区出现冷凝现象。结果表明，简化的过热区散热计算可能会使冷凝器过大。在这里提出的半经验相关性是单相湍流和饱和凝结的现有相关性的组合，可以令人满意地预测过热区凝结的HTC。

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  • 来源
    《Heat Transfer Engineering》 |2013年第15期|1180-1190|共11页
  • 作者

    CHIEKO KONDOU; PEGA HRNJAK;

  • 作者单位

    Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka, Japan;

    Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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