Emilio Navarro

Emilio Navarro
Universidad Politécnica de Madrid | UPM · Departamento de Motopropulsión y Termofluidodinámica

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39
Publications
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Introduction
Skills and Expertise

Publications

Publications (39)
Article
Full-text available
Alkaline electrolysis is already a proven technology on land, with a high maturity level and good economic performance. However, at sea, little is known about its economic performance toward hydrogen production. Alkaline electrolysis units operate with purified water to split its molecules into hydrogen and oxygen. Purified water, and especially th...
Preprint
Full-text available
Successful implementation of active learning strategies in the engineering classroom -- and in particular in certain subjects which are highly technological in nature such as, for instance, rocket engines and space propulsion -- means overcoming certain challenges that arise from the fact that these are extremely complex systems to analyze. In this...
Article
Full-text available
The use nanotechnology along with the consideration of a functionalization and stabilization approach to the poly(vinyl alcohol) (PVA) was considered useful for the preparation of cost‐effective polyelectrolyte membranes. A set of nanocomposite and crosslinked membranes based in PVA/SSA/GO were prepared and analyzed as polyelectrolytes in direct me...
Article
Full-text available
In the current context of demand for reliable, low cost and low environmental impact energy sources, many countries and companies are mostly focused on fuel cells (FCs) in fields as transportation, stationary power generation and portable devices. Lately, FCs have begun to be applied in naval and aeronautical systems due to their high efficiency, l...
Preprint
Full-text available
Membranes commonly used in direct methanol fuel cell (DMFC) are expensive and show a great permeability to methanol which reduces fuel utilization and leads to mixed potential at the cathode. In this work, sulfonated styrene-ethylene-butylene-styrene (sSEBS) modified membranes with zirconia silica phosphate sol-gel phase are developed and studied i...
Conference Paper
In this work, a natural gas boiler is compared with a system based on the combination of a solid oxide fuel cell with a heat pump from an exergetic point of view. The objective of both systems is to achieve the same effect: heating a home. The results of the analysis strongly favor the alternative based on the fuel cell and heat pump.
Article
Full-text available
The use of polymers in direct methanol fuel cells (DMFCs) would reduce their density and cost, thereby enhancing their commercialization. This work aims to select the most appropriate materials among seven thermoplastic polymers (ABS, CPE, CPE+, Nylon, PC, PLA and TPU 95A) for use as bipolar plates (BPs) for different applications of DMFCs. For tha...
Article
This work presents a computer-aided automated design system to quickly optimize the constructive parameters of direct methanol fuel cells (DMFCs) by minimizing a multicriteria design function that includes mass, volume and fuel consumption. In this regard, this work addresses the absence of procedures for DMFC stack design. Four main tasks were per...
Conference Paper
This article illustrates a novel method to produce hydrogen at sea with no carbon footprint, based on alkaline electrolysis, which is the cheapest electrolysis method for in-land hydrogen production, coupled to offshore renewable farms. The novelty of the method presented in this work is the solution to cope with the logistic problem of periodical...
Article
Recently, there has been growing interest in fuel cell implementation on aircraft, particularly for Unmanned Aerial Vehicle (UAV) propulsion. The performance of both fuel cell types, cathode air-breathing H2 Proton Exchange Membrane Fuel Cells (PEMFC/H2) and passive Direct Methanol Fuel Cells (DMFCs), is dependent on atmospheric conditions such as...
Article
NOTE: Share Link – a personalized URL providing 50 days' free access to this article. Anyone clicking on this link before April 11, 2018 will be taken directly to the final version of your article on ScienceDirect. https://authors.elsevier.com/a/1WbMj6nh6ooFG ABSTRACT: Current commercial Autonomous Underwater Vehicles (AUVs) are powered by conve...
Article
Abiotically catalysed glucose fuel cells (AGFC) can take two different forms, external and implantable. They can be used to power computers, mobile phones and other portable low-power devices, and to power implantable medical devices such as pacemakers or devices for electrical stimulation. At present, the maximum power density of implantable AGFC...
Article
Full-text available
span style="line-height: 120%; font-family: 'Times New Roman','serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-ansi-language: ES; mso-bidi-language: AR-SA;">Normalmente, en el aula se resuelven problemas con modelos sobre-simplificados que permiten obtener la solución manualmente. Sin embargo, esto...
Article
A set of mathematical expressions is presented to allow the determination of the water content in a PEMFC membrane, and facilitate the calculation of the water balance under variable conditions of hydration on both sides of it. The study is based on a cooperative model of water diffusion through the membrane, which avoids discontinuities in the cal...
Article
Full-text available
Se ha utilizado en una misma clase presencial recursos docentes convencionales, como son la clase magistral y las presentaciones en pantalla, junto con un laboratorio remoto para impartir docencia de practicas de laboratorio de Motores Alternativos de Combustion Interna. En ambos casos se ha hecho uso de camaras de video para visualizar las instala...
Conference Paper
Full-text available
In the current context of demand for reliable, low cost and low environmental impact energy sources, many countries and companies are mostly focused on fuel cells (FC) in fields as transportation and stationary power generation and portable devices. Lately, FCs have begun to be applied in naval and aeronautical systems due to its high efficiency, l...
Article
Full-text available
A study on the electrochemical response and on essays in a single direct methanol fuel cell with electrodes consisting in Pt films deposited on carbon is presented here. Two commercial electrodes with different catalyst loading and two electrodes prepared by electron beam evaporation of Platinum have been studied under the same conditions. An incre...
Article
Platinum is the most used catalyst in electrodes for fuel cells due to its high catalytic activity. Polymer electrolyte and direct methanol fuel cells usually include Pt as catalyst in their electrodes. In order to diminish the cost of such electrodes, different Pt deposition methods that permit lowering the metal load whilst maintaining their elec...
Article
Full-text available
The possibility of implementing fuel cell technology in Unmanned Aerial Vehicle (UAV) propulsion systems is considered. Potential advantages of the Proton Exchange Membrane or Polymer Electrolyte Membrane (PEMFC) and Direct Methanol Fuel Cells (DMFC), their fuels (hydrogen and methanol), and their storage systems are revised from technical and envi...
Article
The addition of hydrogen to natural gas could be a short-term alternative to today’s fossil fuels, as greenhouse gas emissions may be reduced. The aim of this study is to evaluate the emissions and performance of a spark ignition engine fuelled by pure natural gas, pure hydrogen, and different blends of hydrogen and natural gas (HCNG). Increasing t...
Article
Full-text available
The use of alcohol blends in direct alcohol fuel cells may be a more environmentally friendly and less toxic alternative to the use of methanol alone in direct methanol fuel cells. This paper assesses the behaviour of a direct methanol fuel cell fed with aqueous methanol, aqueous ethanol and aqueous methanol/ethanol blends in a long term experiment...
Article
a b s t r a c t Within the last years there has been increasing interest in direct liquid fuel cells as power sources for portable devices and, in the future, power plants for electric vehicles and other transport media as ships will join those applications. Methanol is considerably more convenient and easy to use than gaseous hydrogen and a consid...
Article
Methanol and ethanol have recently received much attention as liquid fuels particularly as alternative ‘energy-vectors’ for the future. In this sense, to find a direct alcohol fuel cell that able to interchange the fuel without losing performances in an appreciable way would represent an evident advantage in the field of portable applications. In t...
Article
Fuel cells have a promising potential use in stationary and mobile power generation systems, as well as in automotive, aerospace or marine industries. At present, the main field of marine applications of fuel cells is submarines. Hydrogen/oxygen polymer electrolyte membrane (PEM) fuel cells are commonly used in this field. Storage of oxygen in liqu...
Article
Full-text available
RESUMEN La experiencia docente que se presenta gira en torno a una asignatura impartida en la metodología e-learning (completamente a distancia) que forma parte de la oferta global de libre elección de la Universidad Politécnica de Madrid. Ello permite el acceso a una disciplina desde diversos centros de la misma universidad no próximos físicamente...
Article
Full-text available
En esta comunicación se presenta una experiencia conjunta llevada a cabo por varios profesores de la Universidad Politécnica de Madrid, que ha consistido en el rediseño de asignaturas para adaptar su impartición de forma progresiva a formato semi-presencial o completamente a distancia, utilizando una metodología basada en el uso de objetos de apren...
Article
Durante el curso 2007/08 un grupo de profesores de distintas Escuelas de la UPM ha participado en un proyecto coordinado cuyo objetivo principal el la generación y adaptación de materiales didácticos para transformar de forma progresiva la docencia a formato semi-presencial o completamente a distancia. Como recursos educativos se han utilizado los...
Article
Full-text available
Esta comunicación presenta un conjunto de proyectos coordinados de innovación educativa cuyo objetivo principal es la generación y adaptación de materiales didácticos con el fin de implantar una docencia con seguimiento mixto por parte de los alumnos, sustituyendo gran parte de las clases en aula convencionales, o aplicar modelos completamente a di...

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