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Improvement in Performance of Secondary Heat Exchanger for Gas Water Heater by Using Narrow Tubes

机译：利用窄管提高燃气热水器二次换热器性能

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摘要

A new type of heat exchanger, in which flue gas flows inside narrow tubes and water is on the shell side, was proposed to develop the performance and compactness of the shell-and-tube type heat exchanger for latent heat recovery from flue gas. The effects of tube diameter (1.0-5.0 mm) and heat exchange length (7-100 mm) on the heat transfer characteristics of a single tube were systematically investigated by measuring the gas outlet temperature, the pressure loss of the gas, and the condensation rate for moist air. It was shown that the usage of narrower tubes was remarkably effective in achieving the high performance. A rapid temperature drop occurred near the inlet and a high heat transfer rate were realized for narrower tubes with inner diameters of 1.0 and 2.0 mm than with thicker tubes due to the smaller heat capacity flow rate and higher heat transfer coefficient. In addition, the increase in the heat transfer area per volume in the narrow tube type heat exchanger contributed to the compactness. The heat exchanging volume was successfully downsized by one-twentieth by changing the 5.0-mm inner diameter tubes to smaller tubes with 1.0-mm inner diameters.
机译：提出了一种新型的热交换器，其中烟气在窄管内流动，水在壳侧，以提高用于从烟气中潜热回收的壳管式热交换器的性能和紧凑性。通过测量出气温度，气体的压力损失和冷凝水，系统地研究了管径（1.0-5.0 mm）和热交换长度（7-100 mm）对单管传热特性的影响。潮湿空气的速率。结果表明，使用窄管在实现高性能方面非常有效。由于较小的热容流率和较高的传热系数，与内径分别为1.0和2.0 mm的较细管相比，在入口附近温度迅速下降，并且实现了较高的传热速率。另外，在细管型热交换器中每单位体积的传热面积的增加有助于紧凑性。通过将内径为5.0毫米的管改为内径为1.0毫米的较小管，成功地将热交换体积减小了二十分之一。

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  • 来源
    《Heat Transfer Engineering》 |2015年第15期|1282-1291|共10页
  • 作者

    JUNPEI YAMASHITA; YOSHIO UTAKA;

  • 作者单位

    Graduate School of Engineering, Yokohama National University, Yokohama-shi, Kanagawa, Japan;

    Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama-shi, Kanagawa 240-8501, Japan;

  • 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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