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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
TOWARDS EARTH-AIR HEAT EXCHANGERS IN PELOTAS
Submission Author:
Ana Maria Domingues , RS
Co-Authors:
Ana Maria Domingues, Eduardo Nóbrega, Jairo Ramalho, Ruth Brum, Regis Sperotto de Quadros
Presenter: Ana Maria Domingues
doi://10.26678/ABCM.ENCIT2020.CIT20-0270
Abstract
The earth-air heat exchangers (EAHE) are valuable tools for preheating (or pre-cooling) buildings, using little electric power. They work blowing air into buried ducts to exchange heat with the soil. Hence, they take advantage of the thermal energy accumulated in the Earth’s surface layers, which is clean and renewable, helping the efforts to reduce the global warming effects and the depletion of the ozone layer. The article aims to study the feasibility and potential for the installation of EAHE in the south Brazilian city of Pelotas. The EAHE simulations use the analytical model GAEA, showing that it is accurate and computationally efficient, after the initial steps of validation and comparison with experimental data and results from other models available in the literature. This paper analyzes, from a thermal point of view, hypothetical installations at two local addresses, with geotechnical data estimated by Standard Penetration Tests (SPT). The authors evaluate how the depth and diameter of the ducts influence the thermal potential of EAHE. The best results occur by installing them at a depth of 2m and using a diameter of 0.05m.
Keywords
Earth-Air Heat Exchangers (EAHE), GAEA model, Geothermal Energy, Computer models, sustainability
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