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Mr. Pablo Martínez-Filgueira
CS Centro Stirling S. Coop.

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0 Cooling System
0 Flow Visualization
0 Heat Transfer
0 Thermodynamics
0 impingement

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Heat Transfer
impingement

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Journal article
Published: 10 July 2020 in Sustainability
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The photovoltaic cell temperature is a key factor in solar energy harvesting. Solar radiation raises temperature on the cell, lowering its peak efficiency. Air jet impingement is a high heat transfer rate system and has been previously used to cool the back surface of photovoltaic modules and cells. In this work, an experimental comparison of the cooling performance of two different air jet impingement crossflow schemes was performed. Crossflow is defined as the air mass interacting with a certain jet modifying its movement. This leads to a change in its heat exchange capabilities and is related with the inlet-outlet arrangement of the fluid. In this work, zero and minimum crossflow schemes were compared. The main contribution of this work considered the consumption of the flow supplying devices to determine the most suitable system. The best configuration increased the net power output of the cell by 6.60%. These results show that air impingement cooling can play a role in increasing photovoltaic profitability. In terms of uniformity, on small impingement plates with a low number of nozzles, the advantages expected from the zero crossflow configuration did not stand out.

ACS Style

Pablo Martínez-Filgueira; Ekaitz Zulueta; Ander Sánchez-Chica; Gustavo García; Unai Fernandez-Gamiz; Josu Soriano. Experimental Air Impingement Crossflow Comparison and Theoretical Application to Photovoltaic Efficiency Improvement. Sustainability 2020, 12, 5577 .

AMA Style

Pablo Martínez-Filgueira, Ekaitz Zulueta, Ander Sánchez-Chica, Gustavo García, Unai Fernandez-Gamiz, Josu Soriano. Experimental Air Impingement Crossflow Comparison and Theoretical Application to Photovoltaic Efficiency Improvement. Sustainability. 2020; 12 (14):5577.

Chicago/Turabian Style

Pablo Martínez-Filgueira; Ekaitz Zulueta; Ander Sánchez-Chica; Gustavo García; Unai Fernandez-Gamiz; Josu Soriano. 2020. "Experimental Air Impingement Crossflow Comparison and Theoretical Application to Photovoltaic Efficiency Improvement." Sustainability 12, no. 14: 5577.

Journal article
Published: 12 May 2020 in Energies
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The increased demand for wind power is related to changes in the sizes of wind turbines and the development of flow control devices, such as vortex generators (VGs). In the present study, an analysis of the vortices generated by a vane-type VG is performed. To that end, the aerodynamic performance of a DU97W300 airfoil with and without VG is evaluated. The jBAY source term model was implemented for simulation of a triangular-shaped VG and the resolution of the fully meshed computational fluid dynamics (CFD) model. Reynolds-averaged Navier–Stokes (RANS) based simulations were used to calculate the effect of VGs in steady state, and the detached eddy simulation (DES) method was used for angles of attack (AoAs) around the stall situation. All jBAY based numerical simulations were carried out with a Reynolds number of Re = 2 × 106 to analyze the influence of VGs with AoAs between 0 and 20° and were validated versus experimental wind tunnel results. The results show that setting up a VG device on an airfoil benefits its aerodynamic performance and that the use of the jBAY model for simulation is accurate and efficient.

ACS Style

Sergio Chillon; Antxon Uriarte-Uriarte; Iñigo Aramendia; Pablo Martínez-Filgueira; Unai Fernandez-Gamiz; Iosu Ibarra-Udaeta. jBAY Modeling of Vane-Type Vortex Generators and Study on Airfoil Aerodynamic Performance. Energies 2020, 13, 2423 .

AMA Style

Sergio Chillon, Antxon Uriarte-Uriarte, Iñigo Aramendia, Pablo Martínez-Filgueira, Unai Fernandez-Gamiz, Iosu Ibarra-Udaeta. jBAY Modeling of Vane-Type Vortex Generators and Study on Airfoil Aerodynamic Performance. Energies. 2020; 13 (10):2423.

Chicago/Turabian Style

Sergio Chillon; Antxon Uriarte-Uriarte; Iñigo Aramendia; Pablo Martínez-Filgueira; Unai Fernandez-Gamiz; Iosu Ibarra-Udaeta. 2020. "jBAY Modeling of Vane-Type Vortex Generators and Study on Airfoil Aerodynamic Performance." Energies 13, no. 10: 2423.

Journal article
Published: 19 December 2019 in Energies
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Artificial Neural Networks (ANNs) have proven to be a powerful tool in many fields of knowledge. At the same time, evolutionary algorithms show a very efficient technique in optimization tasks. Historically, ANNs are used in the training process of supervising networks by decreasing the error between the output and the target. However, we propose another approach in order to improve these two techniques together. The ANN is trained with the points obtained during an optimization process by a genetic algorithm and a flower pollination algorithm. The performance of this ANN is used as a stop criterion for the optimization process. This new configuration aims to reduce the number of iterations executed by the genetic optimizer when learning the cost function by an ANN. As a first step, this approach is tested with eight benchmark functions. As a second step, the authors apply it to an air jet impingement design process, optimizing the surface temperature and the fan efficiency. Finally, a comparison between the results of a regular optimization and the results obtained in the present study is presented.

ACS Style

Ander Sánchez-Chica; Ekaitz Zulueta; Daniel Teso-Fz-Betoño; Pablo Martínez-Filgueira; Unai Fernandez-Gamiz. ANN-Based Stop Criteria for a Genetic Algorithm Applied to Air Impingement Design. Energies 2019, 13, 16 .

AMA Style

Ander Sánchez-Chica, Ekaitz Zulueta, Daniel Teso-Fz-Betoño, Pablo Martínez-Filgueira, Unai Fernandez-Gamiz. ANN-Based Stop Criteria for a Genetic Algorithm Applied to Air Impingement Design. Energies. 2019; 13 (1):16.

Chicago/Turabian Style

Ander Sánchez-Chica; Ekaitz Zulueta; Daniel Teso-Fz-Betoño; Pablo Martínez-Filgueira; Unai Fernandez-Gamiz. 2019. "ANN-Based Stop Criteria for a Genetic Algorithm Applied to Air Impingement Design." Energies 13, no. 1: 16.

Conference paper
Published: 21 May 2019 in Journal of Physics: Conference Series
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The aim of the study is to analyse and characterize the primary vortices produced by single low profile vane-type vortex generators (VGs) of different heights positioned on a flat plate with a backward-facing ramp and adverse gradient pressure for an incident angle of 15º. The effect of the vortex generator is implemented by using a source term in the Navier-Stokes equations according to the so-called jBAY source term model. In order to carry out the parametric study of the primary vortex, Computational Fluid Dynamics (CFD) simulations have been performed for different VG heights using the Navier-Stokes equations at a Reynolds number of Reθ = 9100 based on the local boundary layer momentum thickness θ in open-source code OpenFOAM. As a preliminary result, the jBAY model reproduces relatively well the streamwise pressure coefficient distributions on the flat plate floor. Finally, the advantage of using this model over a fully mesh-resolved vortex generator model for certain cases must be remarked because a lower number of cells is needed in the model domain with a saving of computational time and resources.

ACS Style

Iñigo Errasti; Unai Fernández-Gamiz; Pablo Martínez-Filgueira; Jesús María Blanco. Parametric study of vane-type vortex generators under adverse pressure gradient by source term modelling in OpenFOAM. Journal of Physics: Conference Series 2019, 1222, 012031 .

AMA Style

Iñigo Errasti, Unai Fernández-Gamiz, Pablo Martínez-Filgueira, Jesús María Blanco. Parametric study of vane-type vortex generators under adverse pressure gradient by source term modelling in OpenFOAM. Journal of Physics: Conference Series. 2019; 1222 (1):012031.

Chicago/Turabian Style

Iñigo Errasti; Unai Fernández-Gamiz; Pablo Martínez-Filgueira; Jesús María Blanco. 2019. "Parametric study of vane-type vortex generators under adverse pressure gradient by source term modelling in OpenFOAM." Journal of Physics: Conference Series 1222, no. 1: 012031.

Research article
Published: 20 May 2019 in Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
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Vortex generators are passive devices employed to improve the aerodynamic performance of aircraft and wind turbine blades. More concretely, these devices have high potential in improving the power output of wind turbines that are producing less power than expected. Besides, it can improve the aerodynamic performance of the nearest parts to the rotor of turbine blades that usually enter in stall. The main goal of this article is to model the triangular vortex generator effect on a DU97-W-300 airfoil by a source term model. This is aimed by comparing the lift and drag coefficients from experimental studies with the data obtained in the computational fluid dynamics study. Furthermore, the vertical path and the size and strength of the vortex are studied for different angles of attack in order to see how the vortex genertaor behaves in different conditions.

ACS Style

L Galera; P Martinez-Filgueira; U Fernández-Gámiz; E Zulueta; Jm Lopez; Jm Blanco. A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 2019, 233, 635 -645.

AMA Style

L Galera, P Martinez-Filgueira, U Fernández-Gámiz, E Zulueta, Jm Lopez, Jm Blanco. A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy. 2019; 233 (5):635-645.

Chicago/Turabian Style

L Galera; P Martinez-Filgueira; U Fernández-Gámiz; E Zulueta; Jm Lopez; Jm Blanco. 2019. "A triangular vortex generator modeling on a DU97-W-300 airfoil by a source term model." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 5: 635-645.

Journal article
Published: 29 April 2019 in Energies
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Air jet impingement systems have proven to be a very efficient way of heat transfer in single phase flows, which has allowed them to be applied in several industries. However, the complexity of the physical phenomena that take place in the cooling or heating processes makes the task of designing and sizing a system of this type very difficult. The objective of this work is to develop a methodology for the optimization of the impingement plate for electronic components cooling systems. The component chosen to exemplify this work is an insulated gate bipolar transistor (IGBT) such as those employed in photovoltaic inverters. The proposed methodology is divided into the thermo-hydraulic calculation process and the optimization of the system. This optimization is carried out using a multi-objective particle swarm optimization (PSO) algorithm that seeks the best compromise between two variables: Component temperature and manufacturing time of the impingement plate. The result is a calculation tool that can quickly find the solution that meets the requirements of the designer without the need to evaluate all possible solutions.

ACS Style

Pablo Martínez-Filgueira; Ekaitz Zulueta; Ander Sánchez-Chica; Unai Fernández-Gámiz; Josu Soriano. Multi-Objective Particle Swarm Based Optimization of an Air Jet Impingement System. Energies 2019, 12, 1627 .

AMA Style

Pablo Martínez-Filgueira, Ekaitz Zulueta, Ander Sánchez-Chica, Unai Fernández-Gámiz, Josu Soriano. Multi-Objective Particle Swarm Based Optimization of an Air Jet Impingement System. Energies. 2019; 12 (9):1627.

Chicago/Turabian Style

Pablo Martínez-Filgueira; Ekaitz Zulueta; Ander Sánchez-Chica; Unai Fernández-Gámiz; Josu Soriano. 2019. "Multi-Objective Particle Swarm Based Optimization of an Air Jet Impingement System." Energies 12, no. 9: 1627.

Journal article
Published: 14 February 2019 in Energies
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An analysis of the generation of vortices and their effects by vane-type vortex generators (VGs) positioned on a three-dimensional flat plate with a backward-facing ramp and adverse gradient pressure is carried out. The effects of a conventional vortex generator and a sub-boundary layer vortex generator are implemented by using a source term in the corresponding Navier-Stokes equations of momentum and energy according to the so-called jBAY Source Term Model. The influence of the vortex generator onto the computational domain flow is modelled through this source term in the Computational Fluid Dynamics (CFD) simulations using the open-source code OpenFOAM. The Source Term Model seems to simulate relatively well the streamwise pressure coefficient distributions all along the flat plate floor as well as certain parameters studied for vortex characterization such as vortex path, decay and size for the two vane-type vortex generators of different heights studied. Consequently, the implementation of the Source Term Model represents an advantage over a fully Mesh-Resolved Vortex Generator Model for certain applications as a result of a meaningful decrease in the cell number of the computational domain which implies saving computational time and resources.

ACS Style

Iñigo Errasti; Unai Fernández-Gamiz; Pablo Martínez-Filgueira; Jesús María Blanco. Source Term Modelling of Vane-Type Vortex Generators under Adverse Pressure Gradient in OpenFOAM. Energies 2019, 12, 605 .

AMA Style

Iñigo Errasti, Unai Fernández-Gamiz, Pablo Martínez-Filgueira, Jesús María Blanco. Source Term Modelling of Vane-Type Vortex Generators under Adverse Pressure Gradient in OpenFOAM. Energies. 2019; 12 (4):605.

Chicago/Turabian Style

Iñigo Errasti; Unai Fernández-Gamiz; Pablo Martínez-Filgueira; Jesús María Blanco. 2019. "Source Term Modelling of Vane-Type Vortex Generators under Adverse Pressure Gradient in OpenFOAM." Energies 12, no. 4: 605.

Journal article
Published: 23 January 2019 in Journal of Electronic Materials
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Unileg-type thermoelectric generators have proven to be a good choice for high-temperature applications, because their composition from a single thermoelectric material avoids different thermal expansion coefficients, giving the structure good mechanical strength and increased lifespan during thermal cycling. These structures are usually composed of a thermoelectric pellet with metallic electrical conductors joining the hot and cold ends of consecutive pellets. The novel unileg structure described herein is designed to deal with one of the main issues with traditional devices, viz. the physical and chemical stability of the solder between the pellet and the conductor at the hot side. The material for which this structure is proposed is a p-type Ca3Co4O9 semiconductor oxide, due to its chemical stability at high temperature and good machinability. This final requirement is related to the main innovation of the structure, viz. a partial cut that divides the pellet longitudinally, leaving two legs joined by an uncut section, forming a section similar to the letter Π. The metallic conductor stripe usually employed in unileg thermoelectric generator manufacturing is replaced by a coating of conductive material, in this case silver, on one of the legs resulting from the cut. Due to these operations, one of the legs is practically short-circuited and acts as an electrical conductor for the unileg structure, eliminating the need for soldering at the hot end of the pellet.

ACS Style

Gustavo García; Pablo Martínez-Filgueira; Marta Cordon; Idoia Urrutibeascoa; Andrés Sotelo; Juan Carlos Diez; Miguel Angel Torres; María A. Madre. Π Unileg Thermoelectric Structure for Cycling Robustness at High Temperature and Low Manufacturing Cost. Journal of Electronic Materials 2019, 48, 2010 -2017.

AMA Style

Gustavo García, Pablo Martínez-Filgueira, Marta Cordon, Idoia Urrutibeascoa, Andrés Sotelo, Juan Carlos Diez, Miguel Angel Torres, María A. Madre. Π Unileg Thermoelectric Structure for Cycling Robustness at High Temperature and Low Manufacturing Cost. Journal of Electronic Materials. 2019; 48 (4):2010-2017.

Chicago/Turabian Style

Gustavo García; Pablo Martínez-Filgueira; Marta Cordon; Idoia Urrutibeascoa; Andrés Sotelo; Juan Carlos Diez; Miguel Angel Torres; María A. Madre. 2019. "Π Unileg Thermoelectric Structure for Cycling Robustness at High Temperature and Low Manufacturing Cost." Journal of Electronic Materials 48, no. 4: 2010-2017.

Journal article
Published: 19 December 2018 in Journal of Electronic Materials
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Conventional heating systems are based either on radiators or on fan coils and the heat transfer process is carried out by convection phenomena in both cases, but with some fundamental differences. Traditional radiators can be considered less efficient compared to fancoils due to the fact that their performance relies on natural convection, a less efficient heat transfer process than forced convection. However, in contrast to fan coils, conventional radiators can operate without the need for mains supply. In this paper, a new heating device based on thermoelectricity, that combines the advantages of both radiators and fancoils, is presented. This new system exploits the heat coming from the heating system to generate electricity, which is consumed in situ to power a fan, eliminating the need for a nearby wall outlet. For this purpose, a laboratory prototype has been built and experimental characterization has been carried out.

ACS Style

G. García; M. Cordon; P. Martínez-Filgueira; I. Garay; J. Aranceta; K. Martin. Development and Experimental Validation of a New Off-Grid Thermoelectric Fancoil for Domestic Heating. Journal of Electronic Materials 2018, 48, 1785 -1794.

AMA Style

G. García, M. Cordon, P. Martínez-Filgueira, I. Garay, J. Aranceta, K. Martin. Development and Experimental Validation of a New Off-Grid Thermoelectric Fancoil for Domestic Heating. Journal of Electronic Materials. 2018; 48 (4):1785-1794.

Chicago/Turabian Style

G. García; M. Cordon; P. Martínez-Filgueira; I. Garay; J. Aranceta; K. Martin. 2018. "Development and Experimental Validation of a New Off-Grid Thermoelectric Fancoil for Domestic Heating." Journal of Electronic Materials 48, no. 4: 1785-1794.

Journal article
Published: 01 July 2017 in International Journal of Hydrogen Energy
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ACS Style

Pablo Martínez-Filgueira; U. Fernandez-Gamiz; E. Zulueta; I. Errasti; Borja Fernandez-Gauna. Parametric study of low-profile vortex generators. International Journal of Hydrogen Energy 2017, 42, 17700 -17712.

AMA Style

Pablo Martínez-Filgueira, U. Fernandez-Gamiz, E. Zulueta, I. Errasti, Borja Fernandez-Gauna. Parametric study of low-profile vortex generators. International Journal of Hydrogen Energy. 2017; 42 (28):17700-17712.

Chicago/Turabian Style

Pablo Martínez-Filgueira; U. Fernandez-Gamiz; E. Zulueta; I. Errasti; Borja Fernandez-Gauna. 2017. "Parametric study of low-profile vortex generators." International Journal of Hydrogen Energy 42, no. 28: 17700-17712.