Banca de QUALIFICAÇÃO: JOSE AIRTON CUNHA COSTA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JOSE AIRTON CUNHA COSTA
DATA : 28/02/2019
HORA: 14:00
LOCAL: Auditório do Laboratório de Cimentos
TÍTULO:

Formulation of phase change materials by the addition of vermiculite, diatomite and paraffin and application in cemetning mortars. 

PALAVRAS-CHAVES:

Phase change material, vermiculite, diatomite, paraffin, mortars.

PÁGINAS: 162
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

Introduction - In order to guarantee the thermal comfort of its users, residential and commercial buildings consume a large part of energy through the elements of theenvelope, heating and cooling the indoor environments. Consequently, ambient heating and cooling systems emit significant amounts of greenhouse gases in urban agglomerates. Concerns in the current century to reduce energy consumption and emission of gases, therefore, lead to advances in the use of materials capable of storing energy in the phase transition process, with special dedication to PCMs (Phase Change Materials). General objective - The starting point of this research is to contribute to the development of materials for the civil construction industry, aimed at improving the thermal comfort of residential and commercial buildings, aiming at reducing energy consumption and CO₂emissions. Specific objective - Of this concern, an innovative PCM material, consisting of two paraffinic, solid and naphthenic oils, and two minerals that serve as a support matrix, diatomite and vermiculite (PCM1 + 2); to evaluate the synergy of the materials involved, correlating the characterization results with the observed thermal properties.Methods - Initially, varying amounts of paraffins were selected and the mixture was chosen to work in the usual temperature range for residential and commercial buildings, 40 ° C, through DSC and FTIR. The starting minerals are characterized by TG, DTA, FRX, MEV-EDS, BET and FT-IR. With the paraffinic mixture chosen and the minerals, a PCM with diatomite (PCM1), another with vermiculite (PCM2) and, finally, another one with diatomite and vermiculite (PCM1 + 2) is formed. In the proportion of the PCMs, BET, MEV, EDS, MO and FT-IR were promoted, and cement mortars were prepared in volume ratio: 1: 4 cement: sand (control trace), 1: 4: 1 of cement: sand: mineral / minerals and 1: 4: 1 cement: sand: PCM and the thermal properties were evaluated, compared to the control trace. Finally, the same thermal properties of the new PCM were evaluated, in varying substitution to the sand volume, in the proportions of 0%, 25%, 50%, 75% and 100%. Conclusions - It is concluded for the new PCM that the minerals together form microcapsules with internally stagnant air, which potentiate the investigated thermal properties. The naphthenic oil used slows the formation of the first drop, and the conjugated properties of the minerals have greater benefits in the thermal properties observed for PCM1+ 2 than the isolated work of the minerals. The new material is thermally and chemically stable, demonstrating its practical use, applicable to the thermal comfort of residential and commercial buildings, reducing energy consumption and CO₂ emissions.

MEMBROS DA BANCA:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Externo ao Programa - 1235107 - GEORGE SANTOS MARINHO
Interno - 1350249 - RUBENS MARIBONDO DO NASCIMENTO