Browsing by Author "Blanco, Jesús María"
Now showing 1 - 3 of 3
Results Per Page
Sort Options
Item NEW CONCEPT OF SOLAR COLLECTOR INTEGRATED INTO A SANDWICH PANEL AS AN ACTIVE FAÇADE; CFD BASED PARAMETRIC ASSESSMENT AND CASE STUDY(2019-11) ELGUEZABAL ESNARRIZAGA, PERU; LOPEZ DOMINGUEZ, ALEX; BLANCO ILZARBE, JESUS MARIA; Chica Páez, José Antonio; Lopez, Alex; Blanco, Jesús María; Tecnalia Research & Innovation; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; SGThe use of renewable energy sources is a clear commitment in the process of developing alternatives to reduce the high energy consumption in buildings. Although with intermittent production, renewable energies are unlimited and have a demonstrated potential to be integrated within buildings. The facade is a key element in a strategic position for harnessing renewable solar energy by means of the Active Solar Façade concept. Through a CFD model, a parametric study has been developed to evaluate different alternatives in the design of an Active Solar Facade, composed by a sandwich panel as unglazed solar collector. The high influence of the conductivity together with the absorptivity has been demonstrated. Directly linked to the material selection for solving the absorber and the hydraulic circuit, the advantage of metals compared with plastics, has been verified. The minor effect of the insulation has also been analyzed, although the necessity of a minimum quantity has been stated looking to avoid significant heat losses. Additionally, the performance of the system has been evaluated in order to determine the potentially achievable energy. The result of the extensive campaign monitored in KUBIK® and developed in different days in a period of 12 months, has resulted in an average daily production of 320Wh / m2. This study highlights the potential benefits of this type of solutions and the necessity to properly dimension and design them. In such way it is aimed to contribute to a greater use of renewable energy in buildings, and consequently for reducing the use of fossil fuels, by means of alternatives that enable the mitigation of the climate change.Item Parametric assessment of a building active façade by means of a combined metallic sandwich panel with an unglazed solar collector(2019-09) Elguezabal, Peru; Lopez, Alex; Blanco, Jesús María; Chica, José Antonio; ECOEFICIENCIA DE PRODUCTOS DE CONSTRUCCIÓN; SGThe building sector has a poor performance in terms of energy efficiency and is looking for alternatives to reduce the use of fossil fuels on building use stage. Renewables are unlimited and solar thermal energy is a technology with a demonstrated potential. The façade is a key element able to harness renewable energy coming from the sun becoming in an Active Solar Thermal Façade (ASTF). The main purpose of this study is the development of a parametric study using a numerical model to analyze the behavior of an unglazed solar collector. Thus, evaluating different design and meteorological parameters to show their influence on the heat transfer and the efficiency. The study shows that solar irradiation and mass flow are the most influential on thermal difference. However, for the efficiency ambient temperature and inlet temperature both are the most influencing ones. In brief, a set of parameters have a significant influence on the behavior of the ASTF that are fully governed by environmental conditions. Nevertheless, there are some other parameters that can be controlled during the operation. The challenge is to make a continuous configuration of this adaptable values depending on the external situation to achieve a higher performance for the ASTF.Item Performance Assessment of Three Turbulence Models Validated through an Experimental Wave Flume under Different Scenarios of Wave Generation(2020-11-05) Galera-Calero, Lander; Blanco, Jesús María; Izquierdo, Urko; Esteban, Gustavo Adolfo; Tecnalia Research & InnovationThis study aimed to adjust the turbulence models to the real behavior of the numerical wave flume (NWF) and the future research that will be carried out on it, according to the turbulence model that best adjusts to each particular case study. The k-", k-! and large-eddy simulation (LES) models, using the volume of fluid (VOF) method, were analyzed and compared respectively. The wavemaker theory was followed to faithfully reproduce the waves, which were measured in an experimental wave flume (EWF) and compared with the theory to validate each turbulence model. Besides, reflection was measured with the Mansard and Funke method, which has shown promising results when studying one of the most critical turbulent behaviors in the wave flume, called the breaking of the waves. The free surface displacement obtained with each turbulence model was compared with the recorded signals located at three points of the experimental wave flume, in the time domain of each run, respectively. Finally, the calculated reflection coefficients and the amplitudes of the reflected waves were compared, aiming to have a better understanding of the wave reflection process at the extinction zone. The research showed good agreement between all the experimental signals and the numerical outcomes for all the turbulence models analyzed.