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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal Performance Of A Multi-block Heat Exchanger Designed On The Basis Of Bejan's Constructal Theory
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Thermal Performance Of A Multi-block Heat Exchanger Designed On The Basis Of Bejan's Constructal Theory

机译：基于Bejan构造理论设计的多段换热器的热性能

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摘要

In the present work, the design and analysis of a multi-block heat exchanger has been carried out by applying the concept of constructal theory proposed by Bejan. The heat exchanger works on the principle of developing laminar flow in each block carefully designed to avoid fully developed heat transfer coefficient. The additional thermal interaction is provided by the special design allowing heat transfer in ports as well as collecting and distributing channels. Numerical simulations were carried out for different values of heat capacity rate ratios on finned and unfinned constructal heat exchangers and four cross flow heat exchangers (two finned and two unfinned). In all the heat exchangers the heat transfer area is kept the same. To validate the numerical results, experiments were conducted keeping the heat transfer area and boundary conditions same as that of the numerical simulations. The results show that the effectiveness of the constructal heat exchangers, both finned and unfinned, are higher by around 20% compared to that of the conventional cross flow heat exchangers under similar conditions. The experimental result confirms this enhancement and brings out the immense potential of this new type of heat exchanger.
机译：在本工作中，通过应用Bejan提出的构造理论的概念，对多段式换热器进行了设计和分析。换热器的工作原理是在每个模块中仔细设计层流，以免产生充分的传热系数。特殊的设计提供了额外的热相互作用，从而允许端口中的热量传递以及收集和分配通道。对翅片式和非翅式建筑换热器以及四个错流式换热器（两个翅片式和两个未翅片式）的不同热容量率比值进行了数值模拟。在所有热交换器中，传热面积保持相同。为了验证数值结果，进行了保持传热面积和边界条件与数值模拟相同的实验。结果表明，在相似条件下，带翅片和不带翅片的结构式热交换器的效率比传统的错流式热交换器高约20％。实验结果证实了这种增强，并展现了这种新型热交换器的巨大潜力。

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