Numerical study of Earth-Air Heat Exchanger considering realistic annual temperature variation of air and soil surface in the region of Federal University of Rio Grande - FURG
DOI:
https://doi.org/10.26512/ripe.v5i1.19216Keywords:
Earth-Air Heat Exchanger (EAHE). Renewable energy. Computational modeling. FLUENT.Abstract
In order to improve the thermal condition inside built environments and consequently to reduce the consumption of electricity, the Earth-Air Heat Exchanger (EAHE) is a device that uses renewable energy from the solar radiation that reaches the soil surface and is deposited in the form of thermal energy. Its operating principle consists of forcing the ambient air to flow inside one or more ducts buried in the ground, which due to its thermal inertia allows the heat exchange with the flowing air. In this way, the soil removes heat from the air in seasons of higher temperatures, and provides heat to the air in seasons of the year when temperatures are lower. Thus, this work has the objective of analyzing numerically the thermal behavior of an EAHE installation, considering the soil of a region of the Federal University of Rio Grande (FURG), as well as the realistic annual temperature variation of air and surface for this region. Through a validated and verified computational model, numerical simulations were performed in Fluent software (based on the Finite Volume Method). The results indicated that the ideal installation depth for the EAHE is 2.00 m, with thermal potential for improving the thermal condition of environments built in both summer and winter.
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