Título :	Caracterização termofísica de bio materiais de mudança de fase por meio da metodologia T-History
Autor :	Monteiro, Mariana Moronari
Orientador(es)::	Brasil Júnior, Antônio César Pinho
Coorientador(es)::	Oliveira, Taygoara Felamingo de
Assunto::	Materiais de mudança de fase Biomaterial Ceras vegetais Propriedades termofísicas Comportamento térmico
Fecha de publicación :	3-sep-2018
Data de defesa::	28-feb-2018
Citación :	MONTEIRO, Mariana Moronari. Caracterização termofísica de bio materiais de mudança de fase por meio da metodologia T-History. 2018. 128 f., il. Dissertação (Mestrado em Ciências Mecânicas)—Universidade de Brasília, Brasília, 2018.
Abstract:	Thermal energy storage has been considered as a viable solution to reduce the problems associated with the intermittent and variable nature of renewable resources. The materials used in the latent heat storage systems are called phase change materials (PCMs), which store and release energy during their phase change. The palm, soybean and carnauba waxes were studied in this work as bio phase change materials and their thermophysical properties were determined using the T-History methodology. An experimental apparatus was developed to obtain the temperature history of the analyzed materials. Eicosano paraffin, because it is a material widely studied in the scientific milieu and has its defined thermophysical properties and reported in the literature, was also characterized in this work to validate both the measurement system and the methodology used. The original and modified T-History method were applied to compare the results obtained by different analysis methodologies. The influence of the cooling rate on the thermal behavior of the materials and on the value of the calculated properties was analyzed through the use of different cooling environments. Based on the presented results, the original T-History method was appropriate for the thermophysical characterization of eicosano and its application generated consistent results, presenting good agreement with the values reported in the literature. In general, the thermal behavior of the studied vegetable waxes was different. Among the vegetable waxes studied in the study, carnauba type 4 wax presented the highest latent heat of fusion and the waxes of carnauba type 3 and soybean had the highest values for thermal conductivity. By means of the tests performed in different cooling environments, it was verified that in fact the increase in the cooling rate influenced the obtained data, resulting in large deviations and low precision in the determination of the thermophysical properties of the PCMs. Due to the lack of data regarding the use of the T-History methodology to determine the properties of vegetable waxes, it was difficult to identify the most appropriate method of analysis for the characterization of waxes. However, because the modified method was specifically developed to analyze materials that did not present their phase change at a well defined level, it became more suitable for the determination of the thermophysical properties of the vegetable wax studied in this work. Although the modified method has limitations, it has made great strides in relation to the original T-History methodology.
metadata.dc.description.unidade:	Faculdade de Tecnologia (FT) Departamento de Engenharia Mecânica (FT ENM)
Descripción :	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2018.
metadata.dc.description.ppg:	Programa de Pós-Graduação em Ciências Mecânicas
Licença::	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) e Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPQ).
Aparece en las colecciones:	Teses, dissertações e produtos pós-doutorado

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