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An Approximate Relation of a Regenerative Heat Exchanger Effectiveness in Off-Design Conditions

机译：非设计条件下蓄热式换热器效率的近似关系

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摘要

A regenerative heat exchanger is an important component of a thermal system in power units, it is crucial to know the performance of the regenerative heat exchanger in off-design conditions during its design and operation. Advanced regenerative heat exchanger simulators have been developed for many years to describe the performance in off-design conditions. The simulators involve the use of equations for mass, momentum, and energy balances and criteria relations for heat transfer coefficients; the geometrical data of the heat exchanger are also required. Due to high complexity, the calculations are performed iteratively. For this paper, a different approach was taken: The heat exchanger was considered as a "black box."Based on the data obtained from the simulator, the effect of input variables on the output ones was investigated, so as to propose a relation describing the regenerative heat exchanger performance. To assess this performance, heat transfer effectiveness was proposed, and its two variants were considered. Since two heat transfer effectiveness definitions were assumed, two approximate relations concerning the regenerative heat exchanger were determined. The relations were verified against data obtained from a simulator of a high-pressure regenerative heat exchanger in a medium-power steam condensing unit. A satisfactory accuracy of the proposed relations was obtained.
机译：蓄热式换热器是动力装置中热力系统的重要组成部分，了解蓄热式换热器在设计和运行过程中处于非设计状态时的性能至关重要。先进的蓄热式换热器模拟器已经开发了很多年，以描述非设计条件下的性能。仿真器涉及质量，动量和能量平衡方程的使用以及传热系数的标准关系。还需要热交换器的几何数据。由于复杂度高，因此需要反复进行计算。在本文中，采用了另一种方法：将热交换器视为“黑匣子”。基于从模拟器获得的数据，研究了输入变量对输出变量的影响，从而提出了一种描述关系的描述。再生热交换器的性能。为了评估该性能，提出了传热效率，并考虑了其两个变体。由于假定了两个传热效率定义，因此确定了与再生式热交换器有关的两个近似关系。根据从中功率蒸汽冷凝单元中的高压蓄热式换热器的模拟器获得的数据验证了这种关系。所建议关系的准确性令人满意。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|37-46|共10页
  • 作者

    Rafat Laskowski; Adam Smyk;

  • 作者单位

    Institute of Heat Engineering, Warsaw University of Technology, Warsaw, Poland;

    Institute of Heat Engineering, Warsaw University of Technology, Warsaw, Poland;

  • 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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