Monografias de Graduação
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Bachelor Thesis Simulação da performance do ciclo simples de refrigeração com refrigerantes hidrocarbonetos(Universidade Federal do Rio Grande do Norte, 2025-01-15) Rodrigues, João Lucas Araujo; Barbosa, Cleiton Rubens Formiga; Barbosa Júnior, Cleiton Rubens Formiga; http://lattes.cnpq.br/9160680023711066; http://lattes.cnpq.br/8673332414572221; André, Thiago; http://lattes.cnpq.br/4001624102117533The applicability of the refrigeration cycle in various industrial and commercial systems promotes the need for its improvement to achieve higher energy efficiencies. The study of thermodynamics for the enhancement of these systems is crucial and has a direct contribution to this evolution. Refrigerants are of great interest in the academic field because, in addition to directly impacting system performance, they have a significant influence on environmental issues. In this study, with the help of the Coolpack software and Microsoft Excel, analyses and discussions were conducted on the simple refrigeration cycle using propane (R290), isobutane (R600a), and propylene (R1270) as refrigerants. Through the CoolPack simulation, it was possible to obtain the performance coefficient values for each variation of the analyzed operational parameters. The results revealed that some parameters are more sensitive and can be further explored in order to achieve better performance for the simple refrigeration cycle.Bachelor Thesis Simulação do ciclo de refrigeração funcionando com R410A(Universidade Federal do Rio Grande do Norte, 2023-12-06) Oliveira, Alexandre Gutierry Melo de; Barbosa, Cleiton Rubens Formiga; Barbosa Júnior, Cleiton Rubens Formiga; Lima, Luiz Henrique Pinheiro deNowadays, air conditioning is crucial for the development of activities in the commercial and industrial areas. This work aims to simulate a simple vapor compression refrigeration cycle using R410A refrigerant. The focus of this study involves investigating, by using the software Coolpack, the sensitivity of the coefficient of performance (COP) of a refrigeration cycle in relation to various operating and design parameters: evaporation and condensation temperatures, superheating and subcooling, pressure drops in the evaporator, condenser, suction, discharge, and liquid line, as well as the isentropic efficiency of the compressor. The acquired results show that the coefficient of performance (COP) of the refrigeration cycle operating with R410A is strongly influenced by the variation of the evaporation and condensation temperatures, and the isentropic efficiency of the compressor. Superheating, subcooling, pressure drops in the suction line and the compressor discharge lines influence the COP value, but to a lesser extent, whilst for the loss of pressure in the evaporator and the liquid line, they do not cause variations in the value of the COP.Bachelor Thesis Análise de um ciclo de refrigeração em cascata, de dois estágios para diferentes fluidos refrigerantes(Universidade Federal do Rio Grande do Norte, 2023-07-11) Lopes, Daniel de Araújo; Barbosa Junior, Cleiton Rubens Formiga; Barbosa, Cleiton Rubens Formiga; Guerra, Angelo Roncalli OliveiraThis study presents the use of Equation Engineering Solver software in the development of a refrigeration system capable of meeting a given demand for freezing beef, having analyzed the viability of an ideal and real one-stage cycle, as well as a two-stage cycle. in cascade, with the main objective of evaluating which refrigerant fluids present better economic results, in addition to discussing legislative and normative factors intrinsic to the use of certain fluids. The annual costs of operating the system between the different choices of fluid are presented and since the best choice proved to be R134a in the lower cycle and R600 for the upper cycle, finally improvements are made to this system.Bachelor Thesis Simulação do ciclo de refrigeração com amônia (R717)(Universidade Federal do Rio Grande do Norte, 2022-12-16) Silva Filho, Antônio Carlos da; Barbosa Junior, Cleiton Rubens Formiga; Barbosa, Cleiton Rubens Formiga; Lima, Luiz Henrique Pinheiro deRefrigeration is the process by which thermal energy is transferred from a low-temperature environment to a high-temperature environment through devices operating in refrigeration cycles. The use of refrigeration is diverse, and it is applied in numerous industries and businesses for both thermal comfort and food preservation. The objective of this study is to analyze the influence of operational parameters such as condensing temperature; evaporating temperature; superheating temperature; subcooling temperature; pressure drop in the condenser; pressure drop in the evaporator; pressure drop in the suction lines, liquid line and compressor discharge lines; and the isentropic efficiency in the coefficient of performance of a vapor compression refrigeration cycle operating with ammonia, R717, using CoolPack software. The simulations using CoolPack are performed from a reference cycle varying the operational parameters according to equal and specific increments for each parameter. With the simulations in the software, it was possible to observe that the evaporation temperature, condensing temperature and the isentropic efficiency of the compressor are capable of significantly influencing the coefficient of performance (COP), which can generate an increase of up to 13% of the COP and causing a decrease in the work performed by the compressor of up to 43,112 𝑘𝐽/𝑘𝑔.Bachelor Thesis Análise do ciclo de refrigeração de duplo estágio funcionando com diferentes refrigerantes halogenados(Universidade Federal do Rio Grande do Norte, 2020-10-16) Santos, Wandembergh Diego Dias; Barbosa, Cleiton Rubens Formiga; Guerra, Angelo Roncalli Oliveira; Barbosa Junior, Cleiton Rubens FormigaBachelor Thesis Análise da performance do ciclo de refrigeração por compressão de vapor de simples estágio funcionando com Isobutano (R600a)(Universidade Federal do Rio Grande do Norte, 2019-06-25) Santos, Dominique Maria dos; Barbosa, Cleiton Rubens Formiga; Guerra, Ângelo Roncalli Oliveira; Mattoso, Luiz Henrique Capparelli