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Previous issue date: 2016-12-19 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Um sistema de arrefecimento ? usado para manter a temperatura ideal de funcionamento e evitar sobreaquecimento, atrav?s de um fluido t?rmico tamb?m chamado fluido de arrefecimento e um trocador de calor. Os fluidos de arrefecimento s?o normalmente compostos por uma solu??o de ?gua e um aditivo, al?m de aditivos inibidores de corros?o e corantes. O etilenoglicol ? um tipo de ?lcool amplamente utilizado como aditivo por ser totalmente sol?vel, com baixa ou nenhuma atividade corrosiva e quimicamente est?vel, al?m de reduzir a press?o de vapor da ?gua. A redu??o da press?o de vapor da solu??o garante aumento do ponto de ebuli??o (ebulioscopia), permitindo uma maior efici?ncia de troca t?rmica do fluido em temperaturas mais elevadas sem mudan?a de fase, tamb?m ? obtida uma diminui??o do ponto de congelamento da ?gua (crioscopia). Por ser t?xico, o etilenoglicol sofre atualmente concorr?ncia de aditivos org?nicos polim?ricos de alta condutividade t?rmica, desenvolvidos para ter um comportamento t?rmico semelhante ao etilenoglicol, com a vantagem de ser at?xicos e biodegrad?veis. Este trabalho desenvolveu an?lises experimentais para caracteriza??o energ?tica de dois fluidos comerciais de arrefecimento, um a base de etilenoglicol e outro a base de pol?mero, foram realizadas an?lises que estimaram suas propriedades termof?sicas a fim de verificar a efici?ncia energ?tica do processo de transfer?ncia de calor no aparato experimental, desenvolvido como parte integrante deste trabalho. / A cooling system is used to maintain the ideal operating temperature and prevent overheating, through a thermal fluid also called cooling fluid and a heat exchanger. Cooling fluids are usually composed of a solution of water and an additive, as well as corrosion inhibiting additives and colorants. Ethylene glycol is a type of alcohol widely used as an additive because it is completely soluble, with little or no corrosive and chemically stable activity, and also reduces the water vapor pressure. The reduction of the vapor pressure of the solution guarantees boiling point increase (ebullioscopy), allowing a higher thermal exchange efficiency of the fluid at higher temperatures without phase change, also a decrease in the freezing point of the water (cryoscopy) . Because it is toxic, ethylene glycol currently undergoes competition from organic additives with high thermal conductivity, developed to have a thermal behavior similar to ethylene glycol, with the advantage of being non-toxic and biodegradable. This work developed experimental analyzes for the energy characterization of two commercial cooling fluids, one based on ethylene glycol and another based on polymer. Analyzes were carried out to estimate its thermophysical properties in order to verify the energy efficiency of the heat transfer process in the apparatus Developed as an integral part of this work.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22571 |
| Date | 19 December 2016 |
| Creators | Santana, Rony Oliveira de |
| Contributors | 22174443449, http://lattes.cnpq.br/8673332414572221, Fontes, Francisco de Assis Oliveira, 20300190468, http://lattes.cnpq.br/9043538628554844, Fontes, L?cio Angelo de Oliveira, 09443703491, http://lattes.cnpq.br/6626062514308083, Almeida, Igor Marcel Gomes, 07039406438, http://lattes.cnpq.br/2914541046309057, Barbosa, Cleiton Rubens Formiga |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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