Comportamento térmico de um protótipo BIPV combinado com armazenamentode água: análise experimental

CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia SolarRESUMO: Os edifícios desempenham um papel ativo no consumo global de energia, e são obrigados não só a minimizar o seu consumo de energia, mas também a gerar energia de forma sustentável. A integração de energias renováveis nos elementos de construção pode substituir materiais de construção comuns, enquanto que geram energia elétrica e térmica. Este artigo apresenta os resultados de uma campanha experimental de protótipo construído no âmbito do projeto NZEB_LAB. O protótipo consiste num módulo fotovoltaico combinado com um tanque de armazenamento de água, separados por uma cavidade de ar ventilada. O sistema foi integrado e analisando em condições reais de funcionamento na fachada do edifício SolarXXI – um edifício de consumo energético quase nulo (nZEB) em Lisboa, Portugal. Os resultados apresentados neste artigo mostram a capacidade de armazenamento do tanque de água, mantendo a temperatura da água de 23ºC-25ºC por um período de 9 horas durante o um dia de Inverno, depois do pôr-do-sol. A ventilação da cavidade de ar permitiu recuperar o calor para o interior durante o Inverno, e, durante o Verão, libertar o calor para o exterior, evitando o sobreaquecimento do protótipo.ABSTRACT: Buildings play an active role in global energy consumption, and are required not only to minimize their energy consumption, but also to generate energy in a sustainable manner. The integration of renewable energies in the building elements can replace common building materials, while generating electrical and thermal energy. This article presents the results of an experimental campaign of a prototype built within the scope of the project NZEB_LAB. The prototype consists of a photovoltaic module combined with a water storage tank (BIPV-WS), with the layers are separated by a ventilated air cavity. The system was integrated and analyzed under real operating conditions at the façade of Solar XXI - a nearly Zero Energy Building (nZEB) in Lisbon, Portugal.The results of this article demonstrated the thermal storage capacity of the water tank, maintaining the water temperature of 23ºC-25ºC for a period of 9 hours during winter, even after sunset. The ventilation of the air cavity made it possible to recover the heat to the interior during the winter, and, during the summer, to release the heat to the outside, avoiding the overheating of the prototype.info:eu-repo/semantics/publishedVersio

Estudo de modelação numérica de um sistema solar com tanque de água integrado em fachada

RESUMO: Os edifícios desempenham um papel ativo no consumo global de energia, e são obrigados não só a minimizar o seu consumo de energia, mas também a gerar energia de forma sustentável. A integração de energias renováveis nos elementos de construção pode substituir materiais de construção comuns, enquanto que geram energia elétrica e térmica. Este artigo apresenta uma análise numérica de um módulo fotovoltaico integrado no edifício e combinado com um tanque de armazenamento de água (BIPV-WS). Recorrendo a ferramenta MatLab – Simulink, foi possível desenvolver um modelo uni-dimensional que representa o comportamento térmico do protótipo em estudo, analisando duas configurações de operação: fechado e ventilado. Os resultados foram validados, com os dados experimentais recolhidos e apresentados noutra publicação. Este modelo será utilizado como a base para o estudo seguinte de otimização do protótipo.ABSTRACT: Buildings play an active role in global energy consumption, and are required not only to minimize their energy consumption, but also to generate energy in a sustainable manner. The integration of renewable energies in the building elements can replace common building materials, while generating electrical and thermal energy. This article presents the validation of a numerical campaign for a photovoltaic module integrated in the building and combined with a water storage tank (BIPV-WS). Using MatLab - Simulink, it was possible to develop an one-dimensional model that represents the thermal behavior of the prototype, analyzing two different configurations: closed and ventlated. The results were validated, with the experimental data recovered and presented in another publication.This model will be used in future projects to optimize the BIPV-WS prototype.info:eu-repo/semantics/publishedVersio

Gloeothece sp. as a nutraceutical source-an improved method of extraction of carotenoids and fatty acids

The nutraceutical potential of microalgae boomed with the exploitation of new species and sustainable extraction systems of bioactive compounds. Thus, a laboratory-made continuous pressurized solvent extraction system (CPSE) was built to optimize the extraction of antioxidant compounds, such as carotenoids and PUFA, from a scarcely studied prokaryotic microalga, Gloeothece sp. Following "green chemical principles" and using a GRAS solvent (ethanol), biomass amount, solvent flow-rate/pressure, temperature and solvent volume-including solvent recirculation-were sequentially optimized, with the carotenoids and PUFA content and antioxidant capacity being the objective functions. Gloeothece sp. bioactive compounds were best extracted at 60?C and 180 bar. Recirculation of solvent in several cycles (C) led to an 11-fold extraction increase of ß-carotene (3C) and 7.4-fold extraction of C18:2 n6 t (5C) when compared to operation in open systems. To fully validate results CPSE, this system was compared to a conventional extraction method, ultrasound assisted extraction (UAE). CPSE proved superior in extraction yield, increasing total carotenoids extraction up 3-fold and total PUFA extraction by ca. 1.5-fold, with particular extraction increase of 18:3 n3 by 9.6-fold. Thus, CPSE proved to be an efficient and greener extraction method to obtain bioactive extract from Gloeothece sp. for nutraceutical purposes-with low levels of resources spent, while lowering costs of production and environmental impacts. © 2018 by the authors.Funding: This work was financially co-supported by: ZEBRALGRE (PTDC/CVT-WEL/5207/2014), founded by national funds through FCT supported by COMPETE 2020: Programa Operacional Competitividade e Internacionalização (POCI)-01-0145-FEDER-016797; by the Structured Program of R&D&I INNOVMAR—Innovation and Sustainability in the Management and Exploitation of Marine Resources, reference NORTE-01-0145-FEDER-000035, namely within the Research Line NOVELMAR—Novel marine products with biotechnological applications, within the R&D Institution CIIMAR (Interdisciplinary Centre of Marine and Environmental Research), supported by the Northern Regional Operational Programme (NORTE2020), through the ERDF; and by DINOSSAUR—PTDC/BBB-EBB/1374/2014-POCI-01-0145-FEDER-016640, funded by FEDER funds through COMPETE2020—POCI and by national funds through FCT—Fundacão para a Ciência e a Tecnologia, I.P