Uma Prospecção Analítica Do Potencial De Trocadores De Calor Soloar Em Pelotas

Nóbrega, Eduardo de Sá Bueno; Domingues, Ana Maria; Brum, Ruth da Silva; Ramalho, Jairo Valões de Alencar; Quadros, Régis Sperotto de

doi:10.22533/at.ed.24221310824

Cited by 2 publications

(7 citation statements)

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“…In this section, the results obtained with the model are presented: for the experiment by Vaz and the application of the EAHE in Pelotas (Nóbrega, 2021). In both cases, the proposed model was compared with the analytical model by Nóbrega (2021), whose solution is given by the equation: are very similar with a maximum variation of 0.20 ºC, where the small discrepancy between them arises from the fact that the proposed model considers the duct material during the heat transfer process. Thus, the proposed model has an extra thermal resistance, causing the curve to have a small delay when compared to the analytical model by Nóbrega (2021).…”

Section: Resultsmentioning

confidence: 99%

“…where T G is the soil temperature and T i is the air in let temperature in the exchanger, both functions dependent on time (Nóbrega, 2021).…”

Section: Modelmentioning

confidence: 99%

“…1) experimental data from Vaz et al (2011), referring to the installation of a EAHE in the city of Viamão, in the state of Rio Grande do Sul; 2) the application of the EAHE in Pelotas, according to the methodology presented by Nóbrega (2021). Below are the data from 1) and 2).…”

Section: Model Verificationmentioning

confidence: 99%

“…Table2 -Thermo-physical properties of air and soil The dimensions and material of the EAHE were the same as the heat exchanger in Vaz's experiment (2011). The air and soil temperature curves are obtained in the same way as the previous experiment, and can be found in the work of Nóbrega (2021).…”

Section: ) Application Of the Eahe In Pelotas -Case Studymentioning

confidence: 99%

“…Therefore, this work aims to use and verify the model developed by Minaei and Safikhani (2021), which is a very complete model in the sense that the modeling of the problem considers the heat exchange between the soil, the duct and air, considering the physical properties of each. Furthermore, this research proposes to work with air and soil temperature functions that vary with time (Nóbrega, 2021), bringing more complexity to the model.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of EAHE through a coupled mathematical model solved by Laplace transform and Gaver-Stehfest algorithm

Martins,

Weymar,

Furtado

et al. 2023

CeN

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The earth-air heat exchangers (EAHEs) are devices that are shown to be a great alternative to assist in the thermal comfort of buildings, mainly due to their low energy cost. The proposed model considers the heat exchange between the soil, the duct and the air, generating coupled equations. This work seeks to employ and verify EAHE applications in two scenarios, first in a literature experiment and then in a EAHE application in Pelotas. In both scenarios, it is considered that the soil and air temperature functions are time dependent. The solution is obtained by applying the Laplace transform and for the inversion of the integral transform the numerical method known as the Gaver-Stehfest Algorithm was used. The obtained results show that the proposed model follows the behavior of the experimental data. In addition to the experimental data, the proposed model was compared with the analytical model by Nóbrega, where the results had a small variation (of 0.20 ºC between them) by considering the heat transfer process in the duct material, modeling a more close to the real situation.

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Section: Resultsmentioning

confidence: 99%

“…where T G is the soil temperature and T i is the air in let temperature in the exchanger, both functions dependent on time (Nóbrega, 2021).…”

Section: Modelmentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

Section: ) Application Of the Eahe In Pelotas -Case Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of EAHE through a coupled mathematical model solved by Laplace transform and Gaver-Stehfest algorithm

Martins,

Weymar,

Furtado

et al. 2023

CeN

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Study of the Influence of Variable Ambient Temperature on Heat Transfer Inside Different Sized Grain Storage Bins

Rickes

Weymar

Furtado

et al. 2023

DDF

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The following work aims to present the numerical solution for a two-dimensional and transient model for heat transfer on storage bins during the period of one year, in which it was supposed that the structure is exposed to ambient temperature, which depends on time. From this hypothesis, it was executed curve fitting of a relation between those quantities, using meteorological data from the city of Pelotas/RS in the year 2021, and the influence that the outside temperature of a bin has over the process of heat transfer that occurs inside the structure was analyzed. Upon executing simulations of heat transfer inside fictitious bins located in this southern Brazilian city, results show that the boundary condition causes considerable variations in grain temperature, which are more intense in points near the bin's surface. Furthermore, it was concluded that containers of least storage show larger variations in inner temperature during the analyzed period when compared to the behavior of bins containing larger sizes.

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Uma Prospecção Analítica Do Potencial De Trocadores De Calor Soloar Em Pelotas

Cited by 2 publications

References 0 publications

Analysis of EAHE through a coupled mathematical model solved by Laplace transform and Gaver-Stehfest algorithm

Analysis of EAHE through a coupled mathematical model solved by Laplace transform and Gaver-Stehfest algorithm

Study of the Influence of Variable Ambient Temperature on Heat Transfer Inside Different Sized Grain Storage Bins

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