Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México

Rodríguez-Vázquez, Martín; Xamán, J.; Chávez, Y.; Hernández-Pérez, I.; Sima, Elena

doi:10.1051/meca/2020016

Cited by 16 publications

(9 citation statements)

References 47 publications

(54 reference statements)

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“…It has been found that the thermal conductivity of soil decreases as the salinity of soil increases due to groundwater entering the soil through capillary (Rodríguez-Vázquez, 2020).…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Various Process Parameters on the Performance of Earth-Air Heat Exchanger (Eahe): A Review

GOYAL¹,

ASATI²,

ARORA³

2022

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The current study reports the systematic review of various parameters on the performance of Earth- Air Heat Exchanger. Various modeling and experimental studies were explored, revealing that EAHE is more suitable for the dry climate than the humid. Moreover, it is also geographically specific as there are many temperature variations globally. It is best suited for semi-arid and the worst for humid climates. The moisture has a significant effect on the cooling performance of EAHE. It is found that the sand proportion in soil significantly improves the density and conductivity of soil concerning the performance of EAHE. It was observed that the increase in salinity of the soil decreases the performance of EAHE because the thermal conductivity of the soil is decreased. Many numeric models like finite volume method, computational model, finite element model, CFD with finite volume, etc., were studied at various geographical conditions with various types of soil varying from very sandy clay, moist clay, and fully saturated clay to dry sand to saturated sand. The findings were also supported through experimental studies, and the performance of EAHE is found better at higher conductivity of the soil. The moisture content of the soil ranged from 0.37 to 0.43 g/cm3 which resulted in a temperature decrease of 1.6 oC. A maximum temperature of 14 oC with a cooling potential of 8972 W was reported. EAHE is very much suitable for urban buildings where space is a constraint, and these have the potential for decreasing the carbon load on the environment as they can provide air conditioning using renewable resources.

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“…It has been found that the thermal conductivity of soil decreases as the salinity of soil increases due to groundwater entering the soil through capillary (Rodríguez-Vázquez, 2020).…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of Various Process Parameters on the Performance of Earth-Air Heat Exchanger (Eahe): A Review

GOYAL¹,

ASATI²,

ARORA³

2022

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“…The authors found several relations among the geometric displacements of the ducts and the EAHE performance. As for the humidity, the reduction of its levels increases significantly the ventilation potential for EAHE, from the results in different cities of México given in (RODRÍGUEZ-VÁZQUEZ et al, 2020). Moreover, it is also worth to mention that EAHE can be coupled with other technologies, forming hybrid systems, such as the photovoltaic/thermal ones presented in (LI et al, 2019), just to cite a recent example.…”

Section: Introductionmentioning

confidence: 99%

A first study on earth-air heat exchanger in Pelotas

et al. 2020

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Earth-air heat exchangers (EAHE) represent a promising option to reduce theheating/cooling load of buildings. Unlike traditional air conditioning systems, the EAHE employ a renewable source of energy and they can work using low electric power. Basically, EAHE employ underground ducts where the air is blown to exchange heat with the ground. Since the superficial layers of the Earth are warmer than outside air in winter and cooler than it in summer, the soil canbe used as a heat source or sink. Therefore, the air leaves the ducts at milder temperatures. Recent research has shown that the Brazilian south region, where prevails a subtropical climate, has a high potential for the use of EAHE. However, such references are still very limited. Hence, this work aims to analyze the thermal performance of EAHE considering the city of Pelotas, located in the south Brazilian state of Rio Grande do Sul. As a case study, we used in situ data, covering thesoil geotechnical profiles from a site in the city, which were obtained by a standard penetration test (SPT). To make the computer simulations, we used an analytical model, which was previously tested and validated. The results point out good prospects for the installation of these devices in the city of Pelotas, taking advantage of its geological potential

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“…Much research has been done on coupled systems where the EAHE is coupled with other devices 15–20 to improve its efficiency or utility. Some researchers have studied the effect of the soil composition 21–25 and climatic conditions 26–31, particularly an arid climate 30, 31, on the performance of EAHE. The studies highlight the potential of EAHE systems in providing thermal comfort in arid regions 30, 31.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

Goyal¹,

Asati²,

Arora³

2023

Chem Eng & Technol

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The airflow in earth‐air heat exchangers with different types of flow was examined at various inlet velocities. The results show that there is a significant variation in the mass flow rate of air through the holes for both induced and forced flow. The mass flow rate ranges from 0.013 to 0.119 kg s−1 for forced flow and from 0.018 to 0.128 kg s−1 for induced flow at a velocity of 4.1 m s−1. In contrast, the variation in the mass flow rate through the pipes is significant only for forced flow and almost negligible for induced flow. The mass flow rate ranges from 0.029 to 0.054 kg s−1 for forced flow and from 0.043 to 0.045 kg s−1 for induced flow at the same velocity, indicating that induced flow may be a valuable method for optimizing the earth‐air heat exchanger performance.

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Thermal potential of a geothermal earth-to-air heat exchanger in six climatic conditions of México

Cited by 16 publications

References 47 publications

Effect of Various Process Parameters on the Performance of Earth-Air Heat Exchanger (Eahe): A Review

Effect of Various Process Parameters on the Performance of Earth-Air Heat Exchanger (Eahe): A Review

A first study on earth-air heat exchanger in Pelotas

Experimental Investigation of Flow Uniformity in a Bank‐Type Earth‐Air Heat Exchanger

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