ES - Relatórios técnicos
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- Development of advanced characterisation tools for the prediction of reburn performance in PF combustors: 3rd annual reportPublication . Carapau, Nuno; Bent, Raquel; Azevedo, Pedro; Gulyurtlu, Ibrahim; Boavida, Dulce
- Working Group 5: Information and trainingPublication . Joyce, A; Maatta, Timo
- NewSOL Project: Thermal calculations for TES tank predesign : EMSP case-studyPublication . Azevedo, PedroABSTRACT: LNEG is one of the partners involved in Task 2.2 “Predesign of tank and module system architectures”. The present document reports work developed by LNEG for partial fulfillment of deliverable D2.1 “Preliminary selection of materials compositions and TES system predesign”. Preliminary data were already published in Azevedo (2017) and on D2.1 “Preliminary selection of materials compositions and TES system predesign”. The present document presents the efficiency approach and the methodology for heat losses and temperature inside the walls calculations. Additionally, the EMSP is hereby described as a case-study and its dimensions, materials, and the aforementioned heat losses and temperature inside the walls, were estimated.
- NewSOL Project: Available CFD models assessmentPublication . Lima, Maria Margarida de Lemos Canedo Giestas; Azevedo, PedroABSTRACT: The partial differential equations that govern fluid flow and heat transfer are not usually amenable to analytical solutions, except for very simple cases. Therefore, in order to analyze fluid flows, flow domains are split into smaller subdomains (made up of geometric primitives like hexahedron and tetrahedron in 3D and quadrilaterals and triangles in 2D). The governing equations are then discretized and solved inside each of these subdomains. In the present situation, a finite volume method will be used to solve the approximate representation of the equations’ system. Care must be taken to ensure proper continuity of solution across the common interfaces between two subdomains, so that the approximate solutions inside various portions can be put together to give a complete picture of fluid flow in the entire domain. The subdomains are often called elements or cells and the collection of all elements or cells is called a mesh or grid. The origin of the term mesh (or grid) goes back to early days of CFD when most analyses were 2D in nature. For 2D analyses, a domain split into elements resembles a wire mesh, hence the name.
- Technical assessment report on solar thermal energy use in cork industry : António Almeida - Cortiças S.A.Publication . Miranda, Miguel; Salema, David; Azevedo, Pedro; Mendes, J. FarinhaABSTRACT: Nowadays, current industrial applications seek, whenever possible, to meet thermal needs on sustainable technologies that are economically viable and environmentally friendly. Despite the high potential, a number of challenges still have to be overcame. Those include maximum attainable temperatures, seasonal and daily transience in solar heat supply and its integration in the industrial processes (among others). For that purpose, the implementation of solar thermal energy into industrial applications has been recognised and addressed by IEA Solar Heating & Cooling Programme (established in 1977), in a number of different research studies, including those ones found in Task 33 and Task 49 (IEA, 2015a; IEA, 2015b; and IEA, 2016) supported by the International Energy Agency (IEA) agenda. In this area, a task called Solar Heat for Industrial Processes (SHIP) emerges, which suggested that solar thermal systems have a significant potential in the sector, even though in an early stage of progress. This activity was led primary by the Commonwealth Science and Industrial Research Organization (Fuller, 2011). General motivations to implement solar systems in cork industry include: i) economics, with respect to worldwide increasing gas prices, and ii) environmental, with respect to the carbon-dioxide footprint associated to this specific industrial sector. The main objective of this report is to assess the technical assessment of solar thermal use in the cork industry, more specifically in the António Almeida - Cortiças S.A., located in the north of Portugal. For that purpose, a close collaboration was establish with this industry through several activities namely: i) energetic audit and ii) different actions of monitoring and implementation of the Energy Consumption Rationalization Agreement (ECRA).
- NewSOL Project : Fluent: Case 0Publication . Azevedo, PedroABSTRACT: This document presents all the described steps in order to set up what is called Case 0. In the following work the inlet mass flow and temperature, the heat losses through walls, the materials themselves and their properties, including, porosity and the turbulence and radiative heat transfer models can also be changed. Everything can change, but the mesh. The only exception to this is to refine the mesh a little bit in particular areas in order to increase detail and mitigate some flow problems and improving the results.
- NewSOL Project : Thermal propertiesPublication . Azevedo, PedroABSTRACT: In order to implement the simulation of as thermal process in a computational fluid dynamics application, it is needed to know the thermal properties of the involved chemical species., namely the density, the specific heat, the dynamic viscosity and the thermal conductivity. The experimental determination of the thermal properties for the molten salts and for the S. Domingos Mines ore were performed by, respectively, Yara and UEvora. In Section 2, the determined thermal properties for both materials are presented; In Section 3, the thermal properties for the molten salts are assessed and adapted to the CFD application package; In Section 4, the same work is performed for the ore slurry; and in Section 5 some conclusions are disclosed.
- NewSOL Project: Implementation and validation tests for Fluent : Case 0Publication . Seram, Victor; Lima, Maria Margarida de Lemos Canedo Giestas; Azevedo, PedroABSTRACT: The present report was made according to the implementation of “Fluent: Case 0”1 of the NewSol Project (Grant nº 720985). The Ansys computational package software was used for the conducted simulations. A 2D geometry symmetrical at the middle axis was constructed. Several meshes were both made and simulated for the minimum computational cost. For simplicity of the problem and at this early stage of development of the model, the ullage space was taken to be filled with HTF (Heat Transfer Fluid). Although HTF fills the ullage space in the tank, this is not in good agreement with the condition described in Case 0 which considers air as the medium. All the simulations were performed with steady state conditions. However, in the future transient state would be used.
- Solar Tower Testing Facility (STTF-100)Publication . Azevedo, Pedro; Cardoso, João P.ABSTRACT: The Concentrated Solar Power (CSP) research field denotes a high degree of multidisciplinarity, gathering several competences with regard to both exact sciences and engineering, such as optics, mechanics, thermodynamics, materials, chemistry, computation, control, instrumentation and so on.