Encontrados 5 documentos, a visualizar página 1 de 1
Numerical modeling of solar ponds
Giestas, Margarida Canedo; Milhazes, Jorge P.; Pina, H.L.A SGSP is a basin of water where solar energy is trapped due to an artificially imposed salinity gradient. In a SGSP three zones can be identified: the surface and bottom zones that are both convective and an intermediate zone in between which is intended to be non-convective. This zone acts as a transparent insulation and allows the storage of solar energy at the bottom where it is available for use. A numeric...
Modeling in TRNSYS of a single effect evaporation system powered by a Rankine c...
Casimiro, Sergio; Ioakimidis, C.; Mendes, J. Farinha; Giestas, Margarida CanedoThe paper presents an analysis of a Single Effect Evaporation (SEE) system as a pre-study to the feasibility of concentrated solar power plants (CSP) powering desalination units for cogeneration of water and electricity. An algorithm to model a SEE system in steady-state operation was made and is described in this work. This algorithm was implemented in TRNSYS environment, and a simple analysis was conducted of...
Symbolic computation and the Rayleigh-Bénard stability problem
Giestas, Margarida Canedo; Pina, H.L.This paper analyzes the linear stability of an horizontal layer of fluid consisting of a mixture of water and salt. The layer is hotter at the bottom and cooler at the top thus having a tendency to destabilize. To counteract this a salt concentration gradient (denser at the bottom and lighter at the top) is sometimes present, either naturally as in the ocean or created artificially as in solar ponds. The releva...
Armazenamento de Energia Solar Térmica
Mendes, J. Farinha; Joyce, António; Giestas, Margarida Canedo; Horta, Pedro; Brites, Maria JoãoCom o objectivo de recolher informação sobre os trabalhos mais recentes de I&D na área do armazenamento solar térmico houve uma participação na “4th International Renewable Energy Storage Conference” IRES 2009, que decorreu nas instalações da Representation of the Federal State of North Rhine Westphalia em Berlim, de 24 a 25 de Novembro e que reuniu cerca de 400 participantes de 22 países. Neste evento que se r...
Thermal energy production by a dual solar pound
Giestas, Margarida Canedo; Joyce, António; Milhazes, Jorge P.; Loureiro, DavidA Salt Gradient Solar Pond (SGSP) is a salt water basin that collects and stores solar energy. These devices rely on the existence of a non-convective zone (NCZ) that functions as a transparent thermal insulation zone, created by a salt gradient. Salinity and temperature gradients in this zone can give rise to double diffusive problems that can decrease the insulation properties of this zone. The stability of t...
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