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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
CONSTRUCTAL DESIGN OF A T-SHAPED EARTH-AIR HEAT EXCHANGER INSTALLED AT RIO GRANDE CITY
Submission Author:
Lucas Costa Victoria , RS
Co-Authors:
Lucas Costa Victoria, Igor Vaz, Luiz Alberto Oliveira Rocha, Elizaldo dos Santos, Michel Kepes Rodrigues, Liércio Isoldi
Presenter: Lucas Costa Victoria
doi://10.26678/ABCM.ENCIT2020.CIT20-0313
Abstract
Earth-Air Heat Exchangers (EAHE) are devices used on buildings aiming the improvement of its thermal conditions. It enables a reduction in electrical energy consumption since it reduces the usage of traditional air conditioners. These devices have a simple operating principle: an imposed airflow inside a buried duct leaves it with a milder temperature due to the exchanging heat occurred with the surrounding soil. Given the above, the main goal here is to combine Analytical Solutions, Computational Modelling, Constructal Design method and Exhaustive Search technique for the analysis of a T-shaped EAHE (with one inlet e two outlets), located at the city of Rio Grande, at the south of Brazil. To do so, an EAHE with a straight duct is adopted as a reference, from which different geometric configurations of the T-shaped EAHE are proposed by means of the Constructal Design. The degree of freedom considered is the ratio between the length of bifurcated and the main branch (L1/L0). In addition, three performance parameters were considered: soil volume occupied, pressure drop of the airflow on the duct, and thermal performance of the EAHE. The performances of the proposed geometric configurations were compared to each other; and the configuration with L1/L0 = 5.0 had the best global performance, reaching a thermal potential for heating of +5.78 °C and for cooling of -5.25 °C, with an approximate reduction of 49 % in pressure drop and 12 % in soil occupation.
Keywords
Earth-Air Heat Exchangers (EAHE), Computational modeling, Numerical simulation, Constructal Design
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