Navegando por Autor "Nunes, Rafael da Silva"

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Análises termodinâmicas de fluidos refrigerantes em sistemas de refrigeração para conservação de vacinas
(2022-12-14) Nunes, Rafael da Silva; Oliveira Neto, Benjamin Batista de; http://lattes.cnpq.br/0355646329266825; Oliveira Neto, Benjamin Batista de; http://lattes.cnpq.br/0355646329266825; Maciel, Paulo Fernando Figueiredo; http://lattes.cnpq.br/0169675639305530; Lima, Placido Ferreira; http://lattes.cnpq.br/0865439005714077
The thermal load demands of a refrigeration system for storing yellow fever (attenuated) and poliomyelitis 1,2 and 3 (attenuated) vaccines were evaluated, following the Rede de Frios Manual for installation at a state level. The bases for the construction of the mathematical models are in the mass conservation and energy balance equations. Control volume analyzes are in accordance with the properties of working fluids such as enthalpy, entropy, pressure, temperature and thermal exchanges. In addition, the best process efficiency was analyzed in comparison with the coefficient of performance of each particular refrigerant fluid in the refrigeration cycle and the monthly cost of electricity relating the price of the cylinder containing the fluid, with the work of the compressor and the hours cold room operation. Special software is used in order to optimize the organization of information and understanding of results. In view of the data presented, it was observed that the R-134a fluid tended to be the most efficient for the parameters of this thermodynamic cycle, since it has the capacity to carry out the refrigeration process with the lowest compressor effort in relation to other refrigerants. In addition, the cost (R$) of R-134a was the lowest in the cycle, since its COP is higher, while R-404a was the second best evaluated and R-507a was the least viable for the process.