Examinando por Autor "Teixeira, Senhorinha"

Mostrando 1 - 3 de 3
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    Publicación
    Assessment of PMV accuracy for different geographic locations using the ASHRAE Thermal Comfort Database II
    (Universidad Nacional de Educación a Distancia (España), Universidad Politécnica de Madrid. Departamento de Ingeniería Mecánica, 2022) Figueira, Leonor; Teixeira, Inês; Rodrigues, Nelson; Magalhaes Ferreira, Ana Cristina; Rodrigues, Cristina; Teixeira, Senhorinha
    Energy use minimization and cost reduction are common goals when talking about indoor climates. However, it is also necessary to assure indoor air quality and thermal comfort. The Predicted Mean Vote (PMV), as presented in the International Standard ISO 7730, is the most widely used thermal comfort index for assessing indoor thermal environments. This index takes into account indoor environmental parameters, including air temperature, radiant heat, relative humidity, air velocity, and personal parameters such as metabolism rate as well as clothing. Despite its wide application, this index was developed for a particular group of people in a specific region, not taking into account personal preferences, and, for these reasons, the accuracy of this model has been questioned. A solution proposed to overcome this discrepancy consists in applying a regional factor that generalizes the PMV to a specific region. Consequently, several studies have been carried out to verify the deviations between the index prediction and the actual thermal comfort. ASHRAE took the initiative to create a database with several studies that included thermal comfort and predictive indices. Thus, the study aims to access the database and to find patterns between the Predicted Mean Vote and the Actual Mean Vote, evaluate the accuracy of the index for different regions, comparing countries with different climatic conditions and characteristics to check for inconsistencies. In this way, it is intended to map European Countries in clutches according to their climatic zone and evaluate the PMV differences. This approach allows performing a correlation for specific climatic zones and obtaining an adjustment factor to apply in future calculations of the PMV index. The results show that the accuracy of the thermal comfort models decreases for regions further from comfort, pointing the need for adjustment of the model.
  • Miniatura
    Publicación
    Influence of temperature on air runoff in the propagation of a forest fire
    (Universidad Nacional de Educación a Distancia (España), Universidad Politécnica de Madrid. Departamento de Ingeniería Mecánica, 2022) Gonçalves, Inês; Marquer, João; Silva, João; Teixeira, José; Alvelos, Filipe; Teixeira, Senhorinha
    Wildfires are a worldwide phenomenon that endangers the ecosystems and all its surroundings. Because forest fires are unpredictable phenomena, it is critical to maximize the instruments employed to mitigate their harmful effects. The main purpose of this work is the development of a model that allows to perform numerical simulations of atmospheric flows over a complex terrain through a CFD model considering the momentum and energy equations, through the use of the commercial software Ansys Fluent. It was concluded that the presence of the forest causes a modification in the velocity profile due to the drag produced by its presence, and the values could be used in a mathematical model to obtain the fire rate of spread and fire line intensity. Through the combustion simulations it was also possible to verify that high temperatures can result in convection currents with high speeds.
  • Miniatura
    Publicación
    Preservando a Tradição: Revitalização de uma Oficina de Tecelagem Artesanal no Conceito de Património Industrial
    (Universidad Nacional de Educación a Distancia (España), Universidad de Concepción - Chile. Departamento de Ingeniería Mecánica, 2024-10-22) Galvão, Manuel; Silva, João; Sousa, Rui; Rodrigues, Cristina; Teixeira, José; Alves, Wellington; Teixeira, Senhorinha
    A defesa do património industrial surge do reconhecimento do papel da indústria no desenvolvimento tecnológico, económico e social. Os elementos tangíveis como edifícios, máquinas, centrais elétricas, linhas de comboio, em conjunto com os elementos intangíveis de “como se fazia” (testemunhos, técnicas, tradições e saberes, etc.) assumem um valor identitário em diversas comunidades, constituindo a memória de um tempo de formação de uma região ou país. O presente trabalho apresenta as principais tarefas levadas a cabo para preparar a reabertura da Oficina de Tecelagem do Instituto Monsenhor Airosa (IMA) em Braga, Portugal. Esta oficina goza de um magnífico espólio de teares Jacquard, alguns com mais de um século. A revitalização desta oficina de tecelagem artesanal compreendeu o levantamento dos requisitos e procedimentos a respeitar para que este espaço fosse certificado como Património Industrial e o cálculo do desempenho energético do edifício com vista ao futuro acolhimento de visitantes.