05.1 - Graduação (UACSA)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2909
Navegar
4 resultados
Resultados da Pesquisa
Item Dimensionamento do grupo moto-propulsor de um aeromodelo(2024-02-19) Batista, Leonardo Henrique Tavares; Simões, Thiago Araujo; http://lattes.cnpq.br/7903824177570749; https://lattes.cnpq.br/1898774956397470Aviation stands out as one of the essential pillars in modern society, offering individuals mobility, convenience, and comfort. In this aspect, aeromodels, representing the first step in the aviation journey, are the subject of study in this work. A crucial aspect in the construction of these aeromodels is the powerplant assembly, formed by the engine and the propeller. This study explores the process of determining the performance of this assembly for aircraft development. Using software such as Excel and Propeller Selector, data were obtained for the elaboration of aircraft performance analyses. These data, along with others provided by different aircraft areas, included coefficients of lift, drag, among other parameters. Through detailed calculations, a comprehensive analysis of the aircraft's performance was conducted in different flight phases, from takeoff to landing, always in compliance with FAR-Part 23 regulations. The motor selected for the project was the electric model D3542, while the chosen propeller had a diameter of 13 inches and a pitch of 7 inches. With these specifications defined, it was possible to evaluate the vehicle's performance to operate with a total weight of 12 kg. This analysis was essential to ensure efficient and safe flight operations, contributing to the continuous advancement of aviation and aerospace technology.Item Método de dimensionamento e seleção de baterias para o sistema de armazenamento de energia de um veículo elétrico(2022-07-14) Lira Júnior, Mário Henrique de Oliveira; Gomes, Flávio da Silva Vitorino; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/3701230748191590; http://lattes.cnpq.br/9895111503369969The design of a battery bank that satisfies the specific demands and range requirements of electric vehicles is a complex project and requires a lot of attention. For this sizing, requirements are used that encompass the characteristics of the batteries and provide which type of battery cell is most indicated, as well as the best arrangement for them. In this context, this work attempts to develop a battery sizing and selection method for the energy storage system of a pure electric vehicle based on the analysis of the vehicle energy demand information and the specificity of the battery technologies. The results demonstrate that the method assists in the decision making process, indicating the most appropriate type of battery cell, as well as the arrangement form and main characteristics of the battery energy storage system.Item Projeto de dimensionamento e seleção de equipamentos para uma câmara frigorífica de congelamento de carnes e resfriamento de laticínios(2021-01-21) Costa, Mateus de Albuquerque Souza; Marques, Adriano da Silva; http://lattes.cnpq.br/0104058705628000; http://lattes.cnpq.br/4446185927194653The food industry condenses one of the biggest applications of industrial refrigeration, be it in the development, storage or distribution of food. Applying knowledge of refrigeration and heat transfer, the present paper has as objective describe the steps of dimensioning a cold store for a supermarket located in the city of Corumbá - MS, with a freezing demand of 15 T/day of beef and cooling of 5000 L/day of curd. In order for the project to be developed, the storage characteristics of the food under study, such as temperature and storage volume, were initially collected. With this information, the dimensioning of the thermal load of the beef and curd chambers was carried out taking into account the product loads, infiltration, heat transmission, people, lighting and equipment. The entire calculation was developed according to the ASHRAE refrigeration manual and using the Engineering Equation Solver (EES) software. For the meat chamber a total thermal load of 269,562 kcal/h was obtained, while for the curd chamber the calculated load was 32,674 kcal/h. In addition, the product storage shelves and cold rooms were dimensioned and designed in CAD, with 58.86 m2 and 54.94 m2 areas for the meat and curd chambers, respectively. Using the thermal load data, refrigeration equipment was selected by consulting supplier catalogs. To meet the demand of the chambers, 5 evaporator units with a nominal capacity of 61,946 kcal/h were selected to freeze the meat and 1 evaporator with a capacity of 42,009 kcal/h to cool the curds. For the stages of compression and condensation, 9 condensing units were chosen with a cooling power of 32,719 kcal/h for meat and only 1 condensing unit with a capacity of 32,854 kcal/h for curds. The equipment operates with R-404A refrigerant. The costs of the project were estimated at around half a million reais, not including freight and installation, with electrical refrigeration equipment comprising approximately 82% of the total value of the project (511,007.00 reals).Item Estudo dos principais aspectos de manutenção em sistema fotovoltaicos on-grid(2021-03-04) Conrado, Deyvison Muniz; Araújo, Marcel Ayres de; http://lattes.cnpq.br/0669410110930611; http://lattes.cnpq.br/8030937685280342The diversification of the Brazilian electric matrix represents a gain in reliability and availability of electricity. In this context, renewable energies have played an increasingly important role in the Brazilian energy sector. Photovoltaic solar energy, in particular, has grown considerably in recent years. One of the factors that contribute to the growth in the use of solar energy is the energy compensation system, which allows grid-connected photovoltaic plants to generate energy credits used for decreasing the bills of plant owners. Along with the increase of installations, there is also a growing demand for preventive and corrective maintenance for these systems. However, few professionals and integrating companies provide consistent maintenance plans for photovoltaic systems, or even know best practices for performing the proper procedures, which represents a problem of reliability, safety and profitability of these systems. In this sense, this work aims to discuss the maintenance of small grid-connected photovoltaic systems, commenting from the project up to the installation of the system, highlighting the relationship of these steps with some aspects of maintenance. Good preventive maintenance practices are described, as well as the relationship between plant maintenance and productivity. Finally, case studies are carried out, in which the importance of implementing appropriate procedures in the installation, operation and maintenance of photovoltaic systems can be assessed.