Banca de DEFESA: Charles Pereira Chaves

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : Charles Pereira Chaves
DATE: 24/04/2023
TIME: 09:00
LOCAL: Online-Teams
TITLE:

Laboratory study of energy piles thermal response test in unsaturated tropical soil.

KEY WORDS:

Thermal pile; Thermal conductivity of lateritic soil; Thermal response test; Unsaturated soils; Heat-exchange piles.

PAGES: 278
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Geotécnica
SUMMARY:

The need to develop new energy efficiency technologies in low enthalpy geothermal systems has become increasingly common and necessary in geotechnics. Regarding piles heat exchangers, it is known that the development of the technology is linked to deep studies of several research centers in the world that are contributing to the technological advancement of the application of piles heat exchangers as an alternative to the efficient use of energy in buildings. In this sense, understanding in depth the behavior of the thermal properties of heat exchanging piles in tropical soils, facing geotechnical variations of specific weight and saturation degree becomes very challenging in geotechnical, This thesis aims to evaluate the thermal behavior of prototype heat exchanger piles made in typical tropical soil of the Federal District, in the compacted and unsaturated condition, in the 1m pile full-scale range, submitted to parametric variations of pipe configuration, saturation degree and internal flow in the pipes, all in a controlled laboratory environment, by means of a large-sized thermal chamber developed for this purpose. To achieve this goal, a thermal response machine was developed to perform the tests on the prototypes. Its experimental evaluations were performed, and with that, thermal response tests were compared, from the point of view of thermal gradient in 2D and thermal resistance in 1D. A study of the thermal properties of the typical lateritic soil of the Federal District was also done. In addition, a thermal well was also developed in which the temperature variations of a 12m deep geotechnical profile were monitored throughout 2 months. Finally, with the results of the thermal response tests, thermal response functions (G functions) were developed for each geotechnical situation in question, where the main geometric and geotechnical peculiarities of the prototypes were compared. Furthermore, the results of thermal conductivity were compared with the main models in force in the geotechnical doctrine, in which new parameters of adjustment of the main models of thermal conductivity in the current bibliography were proposed, as well as a new empirical model, quite accurate, of mathematical adjustment of the lateritic soil of Brasilia.

BANKING MEMBERS:
Presidente - 1122864 - RENATO PINTO DA CUNHA
Interno - 1805002 - ANDRE LUIS BRASIL CAVALCANTE
Interno - 404375 - ENNIO MARQUES PALMEIRA
Externo à Instituição - FERNANDO SABOYA ALBUQUERQUE JUNIOR - UENF
Externa à Instituição - CRISTINA DE HOLLANDA CAVALCANTI TSUHA