Further realistic annual simulations of earth-air heat exchangers installations in a coastal city

Hermes, V.F.; Ramalho, Jairo Valões de Alencar; Rocha, Luíz Alberto Oliveira; Santos, Elizaldo Domingues dos; Marques, Wiliam Correa; Costi, Juliana; Rodrigues, Michel Kepes; Isoldi, Liércio André

doi:10.1016/j.seta.2019.100603

Cited by 30 publications

(12 citation statements)

References 38 publications

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“…To analyze the use of EAHE in the city of Pelotas, is first assessed the properties of the local soil, as done in (RODRIGUES et al, 2018;HERMES et al, 2020). To make a Revista Mundi, Engenharia e Gestão, Paranaguá, PR, v. 5, n. 6, p. 286-01, 286-15, 2020 DOI: 10.21575/25254782rmetg2020vol5n61336 case study, is used data from a site called Trevo do Contorno, whose geographical coordinates are (31 o 45 24.8 S and 52 o 26 2.6 W).…”

Section: Results and Discussion In Pelotasmentioning

confidence: 99%

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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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Section: Results and Discussion In Pelotasmentioning

confidence: 99%

“…As done in the references like (BRUM et al, 2019;RAMALHO et al, 2018;HERMES et al, 2020;, all numerical and experimental results were fitted by sine based functions using the least squares method. Thus, the following temporal functions (t in days):…”

Section: Verification Of the Analytical Modelmentioning

confidence: 99%

A first study on earth-air heat exchanger in Pelotas

et al. 2020

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“…Badescu [42] noticed that for depths greater than 4 m, the performance of the system remains unchanged, so a depth value of 2 m is indicated as a good compromise between the excavation costs (which increase with increasing depths) and the annual variation of the temperature (which decreases with increasing depths). Hermes et al [43] conducted a research on the soil of Rio Grande, Brazil and underlined how problematic the installation of a heat exchanger can be in a coastal city, where the aquifer can be very close to the ground surface. They estimated that below the depth of 2 m the temperature remains constant both in the warm months and in the cold ones.…”

Section: General Concepts and Contextmentioning

confidence: 99%

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Greco

Masselli

2020

Energies

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The aim of this paper is to research the parameters that optimize the thermal performances of a horizontal single-duct Earth to Air Heat eXchanger (EAHX). In this analysis, the EAHX is intended to be installed in the city of Naples (Italy). The study is conducted by varying the most crucial parameters influencing the heat exchange between the air flowing in the duct and the ground. The effect of the geometrical characteristics of the duct (pipe length, diameter, burial depth), and the thermal and flow parameter of humid air (inlet temperature and velocity) has been studied in order to optimize the operation of this geothermal system. The results reveal that the thermal performance increases with length until the saturation distance is reached. Moreover, if the pipe is designed with smaller diameters and slower air flows, if other conditions remain equal, the outlet temperatures come closer to the ground temperature. The combination that optimizes the performance of the system, carried out by forcing the EAHX with the design conditions for cooling and heating, is: D = 0.1 m s−1; v = 1.5 m s−1; L = 50 m. This solution could also be extended to horizontal multi-tube EAHX systems.

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“…However, despite these different applications found in literature, the ERA-Interim data have not been used yet in EAHE applications. The unique exception is the work of Hermes et al, [27], where the proposed methodology was already adopted for the numerical study of an EAHE in Rio Grande City. However, in Hermes et al, [27], no validation of this methodology was showed.…”

Section: Introductionmentioning

confidence: 99%

“…The unique exception is the work of Hermes et al, [27], where the proposed methodology was already adopted for the numerical study of an EAHE in Rio Grande City. However, in Hermes et al, [27], no validation of this methodology was showed. For this reason, in the present work the validation of the proposed methodology is performed together with its complete explanation and with a more comprehensive analysis, justifying the scientific contribution of the article.…”

Section: Introductionmentioning

confidence: 99%

Methodology Allying Standard Penetration Test and Era-Interim Data Set for Numerical Simulations of Earth-Air Heat Exchangers

Victoria

Hermes

Vaz

et al. 2020

ARFMTS

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Earth-Air Heat Exchangers are devices installed on buildings to reduce electrical energy consumption with air conditioner systems. They consist of buried ducts where the air is blown and induces heat exchange with the surrounding soil. Aiming to develop a consistent numerical simulation approach to study its behavior, this research allies the usage of Standard Penetration Test (SPT) and Era-Interim as part of the computational methodology. The results indicate that the proposed methodology can be adequately adopted, allowing the soil properties assignment from SPT reports, the prescription of inlet air temperature, and soil surface temperature from ERA/Interim data.

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Further realistic annual simulations of earth-air heat exchangers installations in a coastal city

Cited by 30 publications

References 38 publications

A first study on earth-air heat exchanger in Pelotas

A first study on earth-air heat exchanger in Pelotas

The Optimization of the Thermal Performances of an Earth to Air Heat Exchanger for an Air Conditioning System: A Numerical Study

Methodology Allying Standard Penetration Test and Era-Interim Data Set for Numerical Simulations of Earth-Air Heat Exchangers

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