http://hdl.handle.net/10174/5275 2026-04-10T16:05:40Z 2026-04-10T16:05:40Z Guerreiro, Luis http://hdl.handle.net/10174/35212 2023-05-22T08:30:06Z 2022-04-01T23:00:00Z

Title: High Temperature Sensible Storage-Molten Salts Authors: Guerreiro, Luis Editors: Cabeza, Luisa Abstract: The technological limitation in the use of solar energy is intermittent generation due to the lack of storage capacity. The impediment that plants do not generate at night and cloudy days makes their massive participation in the energy matrix complex. For this reason, storage systems allow solar thermal power plants a more stable generation of electrical energy independent of the variability of the solar resource. These systems increase the performance and competitiveness of CSP technologies in terms of LCOE (Levelized Cost of Energy) (Stepper, 2014). The main types of thermal energy storage are classified into thermochemical storage, latent heat storage, and sensible heat storage. In the first case, this type of storage involves a reversible chemical reaction where the used medium must have the ability to completely dissociate in the temperature range of the solar field heat. The amount of heat stored will depend on the heat of reaction and the degree of conversion that is achieved in the exothermic and endothermic process. In the case of latent heat storage, the materials used undergo a phase change at a temperature within the upper and lower range of the solar field. The typical phase used is solid-liquid. These systems are governed by the specific heat of the material and by the enthalpy of the phase change, which allows a large amount of energy to be stored in a smaller volume, and thus at a lower cost if compared to sensible heat storage systems (González-Roubaud et al., 2017).

2022-04-01T23:00:00Z Fialho, Luis Melicio, Rui Mendes, Victor Figueiredo, Joao Collares-Pereira, Manuel http://hdl.handle.net/10174/13465 2015-03-31T09:17:28Z 2014-01-01T00:00:00Z

Title: Effect of Shading on Series Solar Modules: Simulation and Experimental Results Authors: Fialho, Luis; Melicio, Rui; Mendes, Victor; Figueiredo, Joao; Collares-Pereira, Manuel Editors: ELSEVIER Abstract: This paper is on the five-parameter modeling for photovoltaic systems. Normally, the technical information for photovoltaic panels is too restricted to identify the five parameters. So, an undemanding heuristic method is adopted in this paper, requiring only information on open circuit, maximum power point and short circuit conditions. The I-V and the P-V curves for a series connected monocrystalline photovoltaic system is obtained from the parameters identification using the heuristic method and validated by comparison with experimental curves. Also, a simulation for partial shading on the photovoltaic system is presented to illustrate a feasible assessment during the design of a PV system for loss of energy conversion due to shading.

2014-01-01T00:00:00Z