Study of car aerodynamic forces modification with mirror suppression via CFD

This thesis presents a study on the aerodynamic behavior of the flow around race car with and without mirrors using a new Lattice Boltzmann Method (LBM) software. The primary objective is to investigate the impact of mirrors on the flow disturbances and aerodynamic forces experienced by the vehicle, with the aim of obtaining a lap time difference in real life circuits between the two models. The study begins by introducing the importance of Computational Fluid Dynamics (CFD) in the accurate study of fluids and specially in motorsports. Then the main CFD methods are presented and assessed in order to be used in the present project. When the limitations are clear, an introductory insight of the LBM is presented to the reader to understand the basic principles of the theory. Through a series of simulations and analysis, the mesh created by the newly discovered LBM software is assessed. This analysis provides powerful insight on the potential of the LBM in the motorsports industry as the results obtained with a gaming home computer with low VRAM seem to be acceptable. Then the aerodynamic performance of the race car is evaluated under different free stream conditions in order to study the evolution that the parameters have with the free stream velocities. The simulations reveal that the presence of mirrors significantly affects the flow vortices, resulting in increased drag and potential impacts on the car’s stability. The practical implications of this research extend to race car design and optimization in competitive racing. The insights gained from the study highlight the possibility of considering the mirrors as a suppressible part of the overall aerodynamic package. The findings contribute to the broader field of race car aerodynamics and can aid teams and manufacturers. When applied to the practical case of a circuit, although there are some limitations on the hypothesis taken as that the car is going all the time in a straight line, the results offer some insight on the effect of the mirrors on the overall time lap. Finally, an alternative to the mirrors is presented leaving the idea open for further design and analysis on the viability. In conclusion, this thesis offers a comprehensive analysis of the aerodynamic behavior of a race car with and without mirrors using a state-of-the-art LBM software. The study emphasizes the significant impact of mirrors on flow patterns, drag, and handling characteristics. The research findings provide valuable insights for optimizing race car performance, enhancing stability, and ensuring driver safety in the highly competitive world of motorsports

Environmental performance of rainwater harvesting strategies in Mediterranean buildings

Purpose: The rapid urbanization and the constant expansion of urban areas during the last decades have locally led to increasing water shortage. Rainwater harvesting (RWH) systems have the potential to be an important contributor to urban water self-sufficiency. The goal of this study was to select an environmentally optimal RWH strategy in newly constructed residential buildings linked to rainwater demand for laundry under Mediterranean climatic conditions, without accounting for water from the mains. Methods: Different strategies were environmentally assessed for the design and use of RWH infrastructures in residential apartment blocks in Mediterranean climates. The harvested rainwater was used for laundry in all strategies. These strategies accounted for (i) tank location (i.e., tank distributed over the roof and underground tank), (ii) building height considering the number of stories (i.e., 6, 9, 12, and 15), and (iii) distribution strategy (i.e., shared laundry, supply to the nearest apartments, and distribution throughout the building). The RWH systems consisted of the catchment, storage, and distribution stages, and the structural and hydraulic calculations were based on Mediterranean conditions. The quantification of the environmental performance of each strategy (e.g., CO2eq. emissions) was performed in accordance with the life cycle assessment methodology. Results and discussion: According to the environmental assessment, the tank location and distribution strategy chosen were the most important variables in the optimization of RWH systems. Roof tank strategies present fewer impacts than their underground tank equivalents because they enhance energy and material savings, and their reinforcement requirements can be accounted for within the safety factors of the building structure without the tank. Among roof tanks and depending on the height, a distribution strategy that concentrates demand in a laundry room was the preferable option, resulting in reductions from 25 to 54 % in most of the selected impact categories compared to distribution throughout the building. Conclusions: These results may set new urban planning standards for the design and construction of buildings from the perspective of sustainable water management. In this sense, a behavioral change regarding demand should be promoted in compact, dense urban settlements.Peer ReviewedPostprint (author's final draft

Floods and consequential life cycle assessment: integrating flood damage into the environmental assessment of stormwater Best Management Practices

Stormwater management is essential to reducing the occurrence of flooding events in urban areas and to adapting to climate change. The construction of stormwater Best Management Practices (BMPs) entails a series of life cycle environmental impacts but also implies avoided burdens, such as replacing urban infrastructure after flooding. The aim of this paper is to integrate flood damage prevention into the life cycle assessment (LCA) of BMPs for quantifying their net environmental impact (NEI) and environmental payback (EP) from a consequential LCA standpoint. As a case study, the application of a filter, swale and infiltration trench (FST) in a Brazilian neighborhood was assessed considering a high-intensity rainfall event. The potential avoided impacts were related to cars and sidewalks that were not destroyed due to flooding. In terms of CO2eq. emissions, the environmental investment related to the FST was recovered when the destruction of one car or 84 m2 of sidewalk was prevented. The NEI of the FSTs resulted in significant impact reductions (up to 700%) with respect to not accounting for the avoided products. This approach can be implemented to any type of BMP, and more accurate estimations can be made with data for different events and different types of material damage.Peer ReviewedPostprint (author's final draft

Identification of the needs of informal caregivers: an exploratory study

[ES] Introducción: El envejecimiento de la población es uno de los principales retos de la salud pública en los países desarrollados. Los cuidadores informales emergen como uno de los principales actores en este escenario, y esto puede afectarlos de forma negativa. Objetivo: El presente estudio tiene como objetivo identificar las necesidades de los cuidadores informales relacionadas con el cuidado de una persona dependiente de una zona básica de salud. Método: Estudio cualitativo y fenomenológico. Participaron en él cuatro cuidadores informales de pacientes no institucionalizados, a quienes se le realizó una entrevista semiestructurada. Posteriormente se realizó un análisis deductivo del discurso. Resultados: El análisis mostró tres temas clave: efecto del cuidar (cuidar tiene efectos negativos en la salud global de los cuidadores), dificultades relacionadas con el cuidado (relacionadas con las adaptaciones en el domicilio, la prevención de heridas, accidentes y movilizaciones) y estrategias de aprendizaje del cuidar (por lógica, observación y formación). Conclusiones: Cuidar tiene un efecto negativo sobre la salud global de los cuidadores. Estos presentan dificultades a la hora de cuidar, y manifiestan utilizar diferentes metodologías para el aprendizaje de los cuidados. Las intervenciones dirigidas a los cuidadores informales deberían incluir aspectos relacionados con la mejoría de su salud y su formación en cuidados. [EN] Introduction: Population aging is one of the main issues in public health within developed countries. Informal caregivers play a central role in this scenario, which can affect them negatively. Objective: The aim of this study is to identify the needs of informal caregivers related to the care of dependent persons of a Basic Health Area. Method: Qualitative and phenomenological study. Four informal caregivers in charge of non-institutionalized patients took part. These patients expressed their opinions in a semi-structured interview, that was deductively analyzed afterwards. Results: The analysis showed three key subjects: the effects of caregiving (how this task negatively affects the global health of the caregivers); difficulties related to care (related to the process of adaptation once at home, prevention of wounds, accidents and mobility issues), and caregiving learning strategies (by deductive reasoning, observation and formation). Conclusions: Caregiving has a negative effect on the caregivers' global health. They show some difficulties in the execution of their tasks, and they declare that they are using various caregiving learning methods. Interventions directed at informal caregivers should include aspects related to health improvement and caregiving training.S

Hypokalemia as a sensitive biomarker of disease severity and the requirement for invasive mechanical ventilation requirement in COVID-19 pneumonia: A case series of 306 Mediterranean patients

Objectives: Serum levels of potassium (K+) appear to be significantly lower in severe cases of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and the clinical significance of this is unknown. The objective was to investigate whether hypokalemia acts as a biomarker of severity in coronavirus disease 2019 (COVID-19) pneumonia and is associated with major clinical outcomes.Methods: A retrospective cohort study of inpatients with COVID-19 pneumonia (March 3 to May 2, 2020) was performed. Patients were categorized according to nadir levels of K+ in the first 72 h of admission: hypokalemia (K+ ≤3.5 mmol/l) and normokalemia (K+ >3.5 mmol/l). The main outcomes were all-cause mortality and the need for invasive mechanical ventilation (IMV); these were analyzed by multiple logistic regression (odds ratio (OR), 95% confidence interval (CI)).Results: Three hundred and six patients were enrolled. Ninety-four patients (30.7%) had hypokalemia and these patients showed significantly higher comorbidity (Charlson comorbidity index ≥3, 30.0% vs 16.3%; p = 0.02) and CURB65 scores (median (interquartile range): 1.5 (0.0-3.0) vs 1.0 (0.0-2.0); p = 0.04), as well as higher levels of some inflammatory parameters at baseline. After adjustment for confounders, hypokalemia was independently associated with requiring IMV during the admission (OR 8.98, 95% CI 2.54-31.74). Mortality was 15.0% (n = 46) and was not influenced by low K+. Hypokalemia was associated with longer hospital and ICU stays.Conclusions: Hypokalemia is prevalent in patients with COVID-19 pneumonia. Hypokalemia is an independent predictor of IMV requirement and seems to be a sensitive biomarker of severe progression of COVID-19

Environmental assessment of sewer construction in small to medium sized cities using life cycle assessment

In a world with an increasing urban population, analysing the construction impacts of sanitation infrastructures through Life Cycle Assessment (LCA) is necessary for defining the best environmental management strategies. In this study, the environmental impacts of one linear meter of sewer constructive solution were analysed for different pipe materials and diameters used in Southern Europe; a unit of different sewer appurtenances (pump, manhole and inspection chamber) was also considered. The impacts of the pipe materials were compared considering different lifespan periods and high-density polyethylene (HDPE) turned out to be the worst option, being polyvinyl chloride (PVC) and concrete the most favourable ones. Few data are available on the material and energy flows in the installation stage; therefore, a comparative analysis of trenches with sand and concrete bedding was conducted. The results show that the installation stage represents up to 80% of the total life-cycle impact of the constructive solutions. Concrete pipes with half-concrete/half-sand bedding are the best option and produce 20-30% of the impact of HDPE pipes with concrete bedding. Hence, designers should focus not only on the pipe but also on the trench model. A methodology was presented to enable the impact aggregation of the different sewer elements, and Betanzos (Spain) was selected to conduct a pilot study in small cities. In the future, studies will need to incorporate the use and maintenance stage, as it is not standard and varies according to the physical features of the cities. Finally, this study provides basic concepts for developing eco-efficiency indicators

Assessing the energetic and environmental impacts of the operation and maintenance of spanish sewer networks from a life-cycle perspective

The final publication is available at Springer via http://dx.doi.org/10.1007/s11269-015-0958-2The environmental impacts resulting from sewer networks are best analysed from a life-cycle perspective to integrate the energy requirements into the infrastructure design. The energy requirements for pumping wastewater depend on the configuration of the city (e.g., climate, population, length of the sewer, topography, etc.). This study analyses and models the effect of such site-specific features on energy consumption and related effects in a sample of Spanish cities. The results show that the average annual energy used by sewers (6.4 kWh/capita and 0.014 kWh/m3 of water flow) must not be underestimated because they may require up to 50 % of the electricity needs of a typical treatment plant in terms of consumption per capita. In terms of Global Warming Potential, pumping results in an average of 2.3 kg CO2eq./capita. A significant positive relationship was demonstrated between the kWh consumed and the length of the sewer and between other factors such as the population and wastewater production. In addition, Atlantic cities can consume 5 times as much energy as Mediterranean or Subtropical regions. A similar trend was shown in coastal cities. Finally, a simple predictive model of the electricity consumption was presented that considers the analysed parameters.Peer ReviewedPostprint (author's final draft

TFG 2013/2014

Amb aquesta publicació, EINA, Centre universitari de Disseny i Art adscrit a la Universitat Autònoma de Barcelona, dóna a conèixer el recull dels Treballs de Fi de Grau presentats durant el curs 2013-2014. Voldríem que un recull com aquest donés una idea més precisa de la tasca que es realitza a EINA per tal de formar nous dissenyadors amb capacitat de respondre professionalment i intel·lectualment a les necessitats i exigències de la nostra societat. El treball formatiu s’orienta a oferir resultats que responguin tant a paràmetres de rigor acadèmic i capacitat d’anàlisi del context com a l’experimentació i la creació de nous llenguatges, tot fomentant el potencial innovador del disseny.Con esta publicación, EINA, Centro universitario de diseño y arte adscrito a la Universidad Autónoma de Barcelona, da a conocer la recopilación de los Trabajos de Fin de Grado presentados durante el curso 2013-2014. Querríamos que una recopilación como ésta diera una idea más precisa del trabajo que se realiza en EINA para formar nuevos diseñadores con capacidad de responder profesional e intelectualmente a las necesidades y exigencias de nuestra sociedad. El trabajo formativo se orienta a ofrecer resultados que respondan tanto a parámetros de rigor académico y capacidad de análisis, como a la experimentación y la creación de nuevos lenguajes, al tiempo que se fomenta el potencial innovador del diseño.With this publication, EINA, University School of Design and Art, affiliated to the Autonomous University of Barcelona, brings to the public eye the Final Degree Projects presented during the 2013-2014 academic year. Our hope is that this volume might offer a more precise idea of the task performed by EINA in training new designers, able to speak both professionally and intellectually to the needs and demands of our society. The educational task is oriented towards results that might respond to the parameters of academic rigour and the capacity for contextual analysis, as well as to considerations of experimentation and the creation of new languages, all the while reinforcing design’s innovative potential