| spelling |
Willian Moreira Duartehttp://lattes.cnpq.br/0182036855915957Tiago de Freitas PaulinoRafael Augusto Magalhaes FerreiraCleison Henrique de Paulahttp://lattes.cnpq.br/3970552018154103Jéssica Cristina Campos Miranda Silva2023-10-02T17:21:46Z2023-10-02T17:21:46Z2023-08-03http://hdl.handle.net/1843/59052A utilização de bombas de calor para aquecer água em vez de aquecedores elétricos é uma forma de reduzir o consumo de energia e consequentemente as emissões de gases do efeito estufa. Nesse contexto, o dióxido de carbono (CO2 ou R744) como fluido refrigerante tem chamado a atenção de diversos pesquisadores da área de refrigeração. Vários trabalhos na literatura avaliaram o desempenho da bomba de calor, desempenho econômico, desempenho energético, desempenho exergético, influência da geometria no evaporador solar, mas não foram encontrados trabalhos que apresentassem o comportamento da pressão no evaporador de uma bomba de calor à R744 no ciclo transcrítico. Nesse contexto, este trabalho apresenta um modelo matemático para o evaporador da bomba de calor (DX-SAHP) que avalia o comportamento da pressão no evaporador quando este não está operando, mas exposto ao sol, e os impactos dessas pressões na integridade estrutural dos componentes, considerando uma quantidade de massa de R744 aprisionada dentro do evaporador variando entre 8% e 12%. Os dados meteorológicos para resolução do modelo matemático foram retirados do site do INMET estudando dados de Belo Horizonte desde 2012 e nas outras quatro regiões do Brasil, com foco no ano de 2022. A pressão máxima do R744 para 12% de massa dentro do evaporador foi de cerca de 12,2 MPa enquanto a pressão máxima de trabalho no evaporador recomendada pelo fabricante do tubo é de 13,2MPa.The use of heat pumps to heat water instead of electric heaters is a way to reduce energy consumption and consequently greenhouse gas emissions. In this context, carbon dioxide (CO2 or R744) as a refrigerant has drawn the attention of several researchers in the field of refrigeration. Several works in the literature evaluated the performance of the heat pump, economic performance, energy performance, exergy performance, influence of the geometry in the solar evaporator, but no works were found that presented the behavior of the pressure in the evaporator of a heat pump at R744 in the cycle transcritical. In this context, this work presents a mathematical model for the heat pump evaporator (DX-SAHP) that evaluates the behavior of the pressure in the evaporator when it is not operating, but exposed to the sun, and the impacts of these pressures on the structural integrity of the components, considering a mass amount of R744 trapped inside the evaporator varying between 8% and 12%. The meteorological data for solving the mathematical model were taken from the INMET website, studying data from Belo Horizonte since 2012 and in the other four regions of Brazil, focusing on the year 2022. The maximum pressure of R744 for 12% of mass inside the evaporator was of about 12.2 MPa while the maximum working pressure in the evaporator recommended by the tube manufacturer is 13.2 MPa.CNPq - Conselho Nacional de Desenvolvimento Científico e TecnológicoFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas GeraisCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorporUniversidade Federal de Minas GeraisPrograma de Pós-Graduação em Engenharia MecanicaUFMGBrasilENG - DEPARTAMENTO DE ENGENHARIA MECÂNICAhttp://creativecommons.org/licenses/by/3.0/pt/info:eu-repo/semantics/openAccessEngenharia mecânicaEnergia - ConsumoSustentabilidadeEvaporadoresBombas de calorDióxido de carbonoEnergia solarModelos matemáticosEfeito estufa (Atmosfera)Modelo numéricoDX-SAHPPressão no evaporadorBomba de calor solar assistidaR744 (CO2)Estudo das pressões máximas no evaporador de uma bomba de calor de expansão direta à R744 assistida por energia solarinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGORIGINALDISSERTAÇÃO_JESSICA SILVA.pdfDISSERTAÇÃO_JESSICA SILVA.pdfapplication/pdf2475744https://repositorio.ufmg.br/bitstream/1843/59052/1/DISSERTA%c3%87%c3%83O_JESSICA%20SILVA.pdf561f25edb4c3a51df61c1070b7c3bac8MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8914https://repositorio.ufmg.br/bitstream/1843/59052/2/license_rdff9944a358a0c32770bd9bed185bb5395MD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82118https://repositorio.ufmg.br/bitstream/1843/59052/3/license.txtcda590c95a0b51b4d15f60c9642ca272MD531843/590522023-10-02 14:21:47.085oai:repositorio.ufmg.br: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ório InstitucionalPUBhttps://repositorio.ufmg.br/oaiopendoar:2023-10-02T17:21:47Repositório Institucional da UFMG - Universidade Federal de Minas Gerais (UFMG)false
|