<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The primary goal of this paper is to assess the thermal behaviour of Earth-to-Air Heat Exchanger (EAHE) under continuous operation mode during the cooling period in warm climatic conditions. An experimental setup was conducted in Biskra University (Algeria) to test the ability to use EAHE as an alternative solution to conventional air conditioning systems. Besides, a transient numerical approach for the flowing air within the EAHE was developed using energy balance equations, discretised by the implicit finite differences method and solved by Thomas method. Furthermore, the transient temperature profile of the soil around the EAHE was investigated in order to determine the adiabatic radius of the soil as a function of the duration of operation. In this context, a transient semi-analytical model was integrated to the air model to estimate the transient EAHE’s performance deterioration. This deterioration is produced by the thermal saturation of the soil, which is influenced by the heat released from the air inside the pipe. Results showed that continuous operation for a duration of four days has minimal impact on the outlet air temperatures due to the implementation of night purging. Furthermore, the design and thermal efficiency of the EAHE are impacted by factors such as higher air velocity and reduced soil thermal conductivity.</p>
</abstract>

The primary goal of this paper is to assess the thermal behaviour of Earth-to-Air Heat Exchanger (EAHE) under continuous operation mode during the cooling period in warm climatic conditions. An experimental setup was conducted in Biskra University (Algeria) to test the ability to use EAHE as an alternative solution to conventional air conditioning systems. Besides, a transient numerical approach for the flowing air within the EAHE was developed using energy balance equations, discretised by the implicit finite differences method and solved by Thomas method. Furthermore, the transient temperature profile of the soil around the EAHE was investigated in order to determine the adiabatic radius of the soil as a function of the duration of operation. In this context, a transient semi-analytical model was integrated to the air model to estimate the transient EAHE’s performance deterioration. This deterioration is produced by the thermal saturation of the soil, which is influenced by the heat released from the air inside the pipe. Results showed that continuous operation for a duration of four days has minimal impact on the outlet air temperatures due to the implementation of night purging. Furthermore, the design and thermal efficiency of the EAHE are impacted by factors such as higher air velocity and reduced soil thermal conductivity.

Experimental and Hybrid Numerical Analytical Approach of an Earth-to-Air Heat Exchanger

Université de Ghardaia, Faculté des sciences et de la technologie

Département d’Automatique et Electromécanique

Université Kasdi Merbah Ouargla, Faculté des Hydrocarbures, des Energies Renouvelables, des Sciences de la Terre et de l’Univers

Laboratoire de Génie Energétique et Matériaux (LGEM)

Département de Forage et Mécanique des Chantiers Pétroliers

Université Mostefa Ben Boulaïd Batna 2, Faculté de Technologie

Département de Socle Commun Science et Technique

Annals of West University of Timisoara - Physics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The primary goal of this paper is to assess the thermal behaviour of Earth-to-Air Heat Exchanger (EAHE) under continuous operation mode during the cooling...

Experimental and Hybrid Numerical Analytical Approach of an Earth-to-Air Heat Exchanger

Publicado en línea: 06 dic 2023

Páginas: 97 - 115

Recibido: 21 ago 2023

Aceptado: 21 oct 2023

DOI: https://doi.org/10.2478/awutp-2023-0008

Palabras clave
Shallow geothermal heat exchangers, Earth-to-Air Heat Exchanger, Soil radius, hybrid numerical analytical approach, Continuous operation

© 2023 Faris Aissaoui et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Experimental and Hybrid Numerical Analytical Approach of an Earth-to-Air Heat Exchanger

Publicado en línea: 06 dic 2023

Páginas: 97 - 115

Recibido: 21 ago 2023

Aceptado: 21 oct 2023

DOI: https://doi.org/10.2478/awutp-2023-0008

Palabras claveShallow geothermal heat exchangers, Earth-to-Air Heat Exchanger, Soil radius, hybrid numerical analytical approach, Continuous operation

© 2023 Faris Aissaoui et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Palabras clave
Shallow geothermal heat exchangers, Earth-to-Air Heat Exchanger, Soil radius, hybrid numerical analytical approach, Continuous operation