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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 372On the Design of Two EAHE Assemblies with Four...

On the Design of Two EAHE Assemblies with Four Ducts

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Abstract:

This article applies the constructal design method to analyze how to improve the thermal performance of earth-air heat exchangers (EAHE) composed by four ducts. The paper evaluates two types of arrangements for which the centers of the ducts take the shape of rectangles and diamonds. Under volumetric constraints, the vertical S_v and horizontal S_h spacings between the ducts are left free to vary. The objective is to maximize the magnitude of the EAHE instantaneous thermal potential P which is an average of the differences between the temperatures at the ducts outlets and inlets at any instant of time. The temperature fields are computed through numerical simulations, adopting a verified and validated three-dimensional model. Among the results, this work shows how the design can raise by 11% the annual thermal efficiency of the EAHE.

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Periodical:

Defect and Diffusion Forum (Volume 372)

Pages:

31-39

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.372.31

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Online since:

March 2017

Authors:

Ruth da Silva Brum*, M.K. Rodrigues, Jairo Valões de Alencar Ramalho, Luiz Alberto Oliveira Rocha, Liércio André Isoldi, Elizaldo Domingues dos Santos

Keywords:

Constructal Design, Earth-Air Heat Exchangers, Instantaneous Thermal Potential, Thermal Efficiency

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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