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首页> 外文期刊>International Journal of Heat Exchangers >Effective Heat Transfer Enhancement in Tubular Heat Exchangers under Single-Phase Flow, Boiling, Condensation and Fouling Conditions
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Effective Heat Transfer Enhancement in Tubular Heat Exchangers under Single-Phase Flow, Boiling, Condensation and Fouling Conditions

机译：在单相流，沸腾，冷凝和积垢条件下，有效提高管式换热器的传热

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摘要

For heat transfer enhancement to be used effectively, it is important to possess a simple and reliable method to evaluate the efficiency of heat transfer enhancement. Presently there is no adequate approach to evaluating heat transfer enhancement efficiency. Therefore, there exists a problem with how to choose optimal parameters of heat exchangers when heat transfer enhancement is used. By using any method for heat transfer enhancement, not only increase in heat transfer coefficients but also in hydraulic resistance coefficients and pumping pressure losses is obtained. Therefore, there is a need to provide a means for thermal and hydraulic evaluation of any method without detailed design of heat exchangers. A method of evaluating the efficiency of heat transfer enhancement in channels of heat exchangers is introduced. The method is the simplest and allows estimating one or another procedure of heat transfer enhancement without detailed design of exchangers. This method has been developed both for tubular heat exchangers with longitudinal flow in tube bundles and for plate-and-fin heat exchangers. The method for calculation of heat transfer enhancement efficiency can be used at any heat transfer coefficient ratio on hot and cold sides of heat exchangers. Compared channels may have different geometry, different perimeters, and different cross-section areas. Various methods of heat transfer enhancement are analyzed in the paper describing tubular heat exchangers with single-phase liquid and gas flow, at boiling and condensation of heat carriers as well as heat exchangers operating under fouling conditions. As a result, practical recommendations on an optimal choice of heat transfer enhancement parameters are obtained.
机译：为了有效地利用传热，重要的是拥有一种简单可靠的方法来评估传热的效率。当前，没有足够的方法来评估传热增强效率。因此，在使用传热增强时如何选择热交换器的最佳参数存在问题。通过使用任何增强传热的方法，不仅传热系数增加，而且水力阻力系数增加，并且获得泵送压力损失。因此，需要提供一种在没有详细设计热交换器的情况下对任何方法进行热力和水力评估的装置。介绍了一种评估热交换器通道传热效率的方法。该方法是最简单的，并且无需对交换器进行详细设计即可估算出一个或另一个增强传热的过程。已经针对在管束中具有纵向流动的管状热交换器以及板翅式热交换器开发了该方法。换热增强效率的计算方法可以在热交换器的热侧和冷侧的任何传热系数比下使用。比较的通道可能具有不同的几何形状，不同的周长和不同的横截面积。本文分析了各种强化传热的方法，这些方法描述了在热载体沸腾和冷凝时具有单相液体和气体流动的管式热交换器以及在结垢条件下运行的热交换器。结果，获得了关于最佳选择传热增强参数的实用建议。

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