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Optimization of a seasonal storage solar system using Genetic Algorithms

Seasonal storage solar systems are capable of storing thermal energy, from one season to another (typically a few months). In the present paper solar thermal energy generated during summer time, is stored for use in winter time (typically 120 days). The analyzed system consists of solar thermal collectors and a sensible heat storage device using water as storing media. The area of solar collector and the capaci...

PV system with maximum power point tracking: modeling, simulation and experimen...

This paper focuses on the five parameters modeling, consisting on a current controlled generator, single-diode, a shunt and series resistances. Also, a simulation, identification of the parameters for a photovoltaic system and the maximum power point tracking based on VP„g„g is presented. The identification of parameters and the performance of the equivalent circuit model for a solar module simulation are valid...

Working Group 5: Information and training

CA-RES report - The Concerted Action to support the implementation of the RES Directive 2009/28/EC (CA-RES)

As tecnologias fotovoltaicas

Muito se tem escrito e dito sobre a conversão directa (sem passar pelo calor) da Energia Solar em Electricidade, nomeadamente sobre a conversão Fotovoltaica, baseada no Efeito Fotovoltaico descoberto pelo físico francês Edmond Becquerel em 1839. Trata-se basicamente de um processo quântico em que fotões associados à radiação incidente (Solar ou outra) são absorvidos num material semicondutor e possibilitam a ex...

A PV/T and Heat Pump based trigeneration system model for residential applications

A solar trigeneration system, based on photovoltaic-thermal (PV/T) collectors, photovoltaic (PV) modules and a heat pump unit for heating and cooling, is modelled to forecast the thermal and electric yields of the system. The aim of the trigeneration system is to provide enough electricity, domestic hot water (DHW), heating and cooling power to meet the typical demand of an urban single family dwelling with lim...

O Solar Fotovoltaico de Concentração

Os sistemas fotovoltaicos de concentração (CPV) utilizam espelhos ou lentes para concentrar a radiação solar em células fotovoltaicas. O objectivo é baixar o custo da produção de electricidade destes sistemas ao substituir área de células ou de módulos fotovoltaicos, em geral de custo elevado, por ópticas de concentração de menor custo.São sistemas que podem atingir eficiências superiores a 25% na produção de e...

Armazenamento de Energia Solar Térmica

Com 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...

Potencial da energia solar térmica e fotovoltaica

Autonomous hydrogen systems: control strategy

This paper describes the control strategy for a Stand-Alone Energy System Supported by Totally Renewable Hydrogen Production. The basic control strategy considers the pressurized hydrogen gas storage as the energy buffer. The basic logic is that the exceeding renewable energy (solar and wind) is used to accumulate hydrogen, while the fuel cell uses this hydrogen to produce electrical energy within insufficient ...

Solar XXI building PV systems: performance during the first two yeras of operation

The purpose of this paper is to present the results obtained in the first two years of operation of the grid-connected photovoltaic (PV) systems installed in the named “Solar XXI” building. One PV system, made with multicrystalline silicon modules, has a peak power of 12 kW and was installed on the façade; another system made with amorphous silicon modules has a peak power of 6 kW and was installed in the surro...