63 documents found, page 1 of 7
Thermal performance evaluation of pure PDMS and PDMS composites heat exchangers
Souza, Reinaldo; Nobrega, Glauco; Afonso, Inês Santos; Pereira, José; Cardoso, Elaine; Marques, Filipe; Vilarinho, Cândida; Moita, Ana; Lima, Rui A.This study investigates the heat transfer performance of three types of heat exchangers: one made of pure polydimethylsiloxane (PDMS), another incorporating recycled graphite (PDMS + Graphite 30 mass%), and a third using commercial aluminium nanoparticles (PDMS + Aluminium 30 mass%). Thermal performance was evaluated by measuring the thermal conductivity of the materials, analysing experimental convection tests...
Challenges of digital waste marketplace - the upvalue platform
Soares, Margarida; Ribeiro, André; Vasconcelos, Tomás; Barros, Manuel; Castro, Carla; Vilarinho, Cândida; Carvalho, JoanaWaste management is a major challenge for contemporary societies, requiring urgent attention since population growth combined with widespread consumerism and industrialization has led to an alarming increase in waste production. To avoid harmful environmental impacts and the misuse of resources, it is urgent to combat this scourge. A potential solution involves the creation of industrial symbioses, characterize...
Diving into fish valorisation: review opportunities and analyzing azorean fish ...
Valério, Nádia Castanho; Soares, Margarida; Vilarinho, Cândida; Correia, Manuela; Carvalho, JoanaIn response to the exponential growth in world population, there has been a striking surge in the volume of discarded fish worldwide. This surge is particularly evident in the fish processing industry, where a substantial amount of waste is generated, posing significant environmental concerns. Consequently, the repurposing and utilisation of these waste materials have emerged as pivotal processes for the preser...
Experimental thermal behavior of fibrous structures for high-performance heat r...
Cunha, Diogo; Fangueiro, Raúl; Bessa, João; Paiva, Conceição; Ribeiro, Daniel; Silva, Elisabete; Silveira, Dionísio; Soares, Delfim; Vilarinho, CândidaFibrous materials are often used in the manufacturing of fire protection devices such as fire curtains. Their optimization and improved performance is still a topic of interest. The present work aims to develop and test a new combination of fibers arranged in various 2D and 3D patterns with coatings. For this purpose, basalt fibers were added into a glass fiber fabric, and wires of a shape memory material (SMM)...
Influence of temperature in the thermo-chemical decomposition of below-stoichio...
Castro, Carlos Eduardo Rodrigues; Gonçalves, Margarida; Longo, Andrei; Vilarinho, Cândida; Ferreira, Manuel; Ribeiro, André; Pacheco, NunoDue to the energy crisis that some countries are facing nowadays, the gasification process appears to be a good alternative to produce some energy from solid materials. Increasingly, gasification involves using wastes as a solid fuel, making the process green and reusing some materials that otherwise could end up in a landfill. However, the process of finding the best gasification parameters of a sample can be ...
Study of mass loss and elemental analysis of pine wood pellets in a small-scale...
Fraga, Lelis Gonzaga; Silva, João Pedro Vasconcelos; Teixeira, J. Carlos; Ferreira, Manuel Eduardo Cardoso; Teixeira, S. F. C. F.; Vilarinho, CândidaStudying the thermal decomposition of wood pellets is an important subject in order to understand the behavior of wood pellets during the combustion process. In fact, wood pellets have become an important fuel used in boiler combustion. The objective of this study is to investigate the mass loss and elemental analysis of pine wood pellets at various times and temperatures. Commercial pellets with a diameter of ...
Life Cycle Assessment (LCA) of biochar production from a circular economy persp...
Carvalho, Joana; Nascimento, Lucas; Soares, Margarida; Valério, Nádia Castanho; Ribeiro, André; Faria, Luciana; Silva, André; Pacheco, NunoClimate change and environmental sustainability are among the most prominent issues of today. It is increasingly fundamental and urgent to develop a sustainable economy, capable of change the linear paradigm, actively promoting the efficient use of resources, highlighting product, component and material reuse. Among the many approaches to circular economy and zero-waste concepts, biochar is a great example and ...
Turning waste cooking oils into biofuels - valorization technologies: a review
Nascimento, Lucas; Ribeiro, André; Ferreira, Ana; Valério, Nádia; Pinheiro, Vânia; Araújo, Jorge; Vilarinho, Cândida; Carvalho, JoanaIn search of a more sustainable society, humanity has been looking to reduce the environmental impacts caused by its various activities. The energy sector corresponds to one of the most impactful activities since most energies produced come from fossil fuels, such as oil and coal, which are finite resources. Moreover, their inherent processes to convert energy into electricity emit various pollutants, which are...
Characterization of hydrochar and process water from the hydrothermal carboniza...
Nobre, Catarina; Alves, Octávio; Durão, Luís; Sen, Ali; Vilarinho, Cândida; Gonçalves, MargaridaIn this study, hydrothermal carbonization (HTC) was used as a thermochemical conversion process to upgrade Refuse Derived Fuel (RDF). The effect of process temperature (250 °C, 275 °C and 300 °C), residence time (30 min and 120 min), and RDF-to-water ratio (1:15 and 1:5) on the main characteristics of the produced hydrochars and process waters was assessed. The HTC process yielded hydrochars with enhanced fuel ...
A circular approach for landfill leachate treatment: Chemical precipitation wit...
Viegas, Catarina; Nobre, Catarina; Mota, André Manuel Oliveira; Vilarinho, Cândida; Gouveia, Luisa; Gonçalves, MargaridaThe aim of this work was to study an integrated approach for landfill leachate remediation comprising chemical precipitation with biomass bottom ash as a pre-treatment to reduce color and turbidity followed by bioremediation through microalgae treatment for effluent disposal. Optimal pre-treatment conditions were determined through batch experiments and were found to be 160 g L 1 ash dose, 96 h of contact time,...