Improving the performances of earth air heat exchangers through Constructal design - Laboratoire Matériaux et Durabilité des Constructions [Toulouse] Access content directly
Journal Articles International Journal of Energy Research Year : 2019

Improving the performances of earth air heat exchangers through Constructal design

Abstract

Earth to Air Heat Exchanger (EAHE) is a well-known technique used to preheat or precool outdoor air before blowing it into a building. However, its geometry is often very simple as it consists in one or multiple straight pipes, while more complex arrangement can be found for heat exchangers. In this paper, we explore the advantage of designing an EAHE as a network by using the Constructal Law point of view. A methodology is first proposed to design a single pipe EAHE when the need is defined in terms of cooling power, overall efficiency and enthalpy difference between the inlet air and the ground. Next, the single pipe EAHE is used as a reference for designing a tree-shaped network under the constraint of identical fluid volume and cooling power. The geometrical features are allowed to change for the different branches of the network. The network coefficient of performance is found to increase significantly with the bifurcation level, illustrating the superior performances of the network. This approach was found to be robust as the improvements were not depending on the cooling demand or the environmental conditions. However, further work is needed to move from this analytical result to practical considerations.
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Dates and versions

hal-02274662 , version 1 (30-08-2019)

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Ruth da Silva Brum, Matthieu Labat, Sylvie Lorente. Improving the performances of earth air heat exchangers through Constructal design. International Journal of Energy Research, 2019, ⟨10.1002/er.4835⟩. ⟨hal-02274662⟩
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