Time filter

Source Type

Bhouri M.,Institute Of Recherche Sur Lhydrogene | Goyette J.,Institute Of Recherche Sur Lhydrogene | Hardy B.J.,Savannah River National Laboratory | Anton D.L.,Savannah River National Laboratory
2010 14th International Heat Transfer Conference, IHTC 14 | Year: 2010

Transport processes in a sodium alanate hydrogen storage system during desorption are presented. The mathematical model, which considers heat conduction and convection, hydrogen flow governed by Blake-Kozeny law and the chemical kinetics, is solved using the COMSOL Multiphysics® finite element software. The numerical simulation is used to present the time-space evolutions of the temperature, pressure and hydride concentration. The results are discussed for two cases: a finned storage system and a finless one. It is shown that the whole process occurring in the bed is governed and controlled by heat transfer from the heating fluid to the storage media and strengthened by axial heat transfer through the fins. The importance of the hydride bed thermal conductivity has also been evaluated. It was observed that the hydrogen discharge rate in a finless system can be improved if we find ways of increasing the thermal conductivity of the storage media. On the other hand, for a reservoir with fins, heat transfer is good enough that the discharge rate is limited by the kinetics. © 2010 by ASME.

Boulon L.,University of Quebec at Trois - Rivieres | Boulon L.,Institute Of Recherche Sur Lhydrogene | Boulon L.,A+ Network | Agbossou K.,University of Quebec at Trois - Rivieres | And 8 more authors.
Renewable Energy | Year: 2012

This paper presents a Proton Exchange Membrane Fuel Cell model suitable for water management analysis. In order to be integrated into a complete fuel cell vehicle simulation for real-time control and energy management designs, Energetic Macroscopic Representation is used. An experimental validation is performed and electric and gaseous behaviors are studied in particular. The integration of the developed model into a vehicle simulation, in which the FC is used as a range extender, demonstrates the use of the model and allows the study of the behavior of this system. © 2012 Elsevier Ltd.

Zuniga M.,University of Quebec at Trois - Rivieres | Zuniga M.,Institute Of Recherche Sur Lhydrogene | Zuniga M.,Laboratorio Of Energia Escuela Colombiana Of Ingenieria Julio Garavito | Jaguemont J.,University of Quebec at Trois - Rivieres | And 5 more authors.
2015 IEEE Vehicle Power and Propulsion Conference, VPPC 2015 - Proceedings | Year: 2015

The poor performance of Lithium-ion batteries in cold climates is a major concern because they suffer a huge loss in capacity and degradation. Thus, this makes battery-powered vehicles challenging to operate in cold environment. However, thermal rising methods exist and typically use a separate heating element which provides the required thermal energy to the pack to be heated. On the other hand, it is possible to internally heat cold batteries via internal RI&x000B2; losses by circulating alternating currents (AC). This papers presents a comparison between these two methods. An electro thermal model is used to obtain the simulation results. With this model as based, a low frequency (0.01 Hz) square current is applied. © 2015 IEEE.

Garcia J.E.,University of Quebec at Trois - Rivieres | Garcia J.E.,Institute Of Recherche Sur Lhydrogene | Herrera D.F.,University of Quebec at Trois - Rivieres | Herrera D.F.,Institute Of Recherche Sur Lhydrogene | And 5 more authors.
IEEE International Symposium on Industrial Electronics | Year: 2014

This paper presents a power splitting algorithm in order to optimize the efficiency of a multi fuel cell system. Versus a single fuel cell, such a system is modular, allows a better efficiency curve and reduces the risk of general failure. The results of the algorithm are easy to implement into a real time controller. This work presents simulation results based on an experimental power vs efficiency curve. © 2014 IEEE.

Jaguemont J.,University of Quebec at Trois - Rivieres | Jaguemont J.,Institute Of Recherche Sur Lhydrogene | Boulon L.,University of Quebec at Trois - Rivieres | Boulon L.,Institute Of Recherche Sur Lhydrogene | And 2 more authors.
Applied Energy | Year: 2016

Because of their numerous advantages, lithium-ion (Li-ion) batteries have recently become a focus of research interest for vehicle applications. Li-ion batteries are suitable for electric vehicles (EVs) and hybrid electric vehicles (HEVs) because of advantages such as their high specific energy, high energy density, and low self-discharge rate in comparison with other secondary batteries. Nevertheless, the commercial availability of Li-ion batteries for vehicle applications has been hindered by issues of safety, cost, charging time, and recycling. One principal limitation of this technology resides in its poor low-temperature performance. Indeed, the effects of low temperature reduce the battery's available energy and increase its internal impedance. In addition, performance-hampering cell degradation also occurs at low temperatures and throughout the entire life of a Li-ion battery. All of these issues pose major difficulties for cold-climate countries. This paper reviews the effects of cold temperatures on the capacity/power fade of Li-ion battery technology. Extensive attention is paid to the aging mechanisms of Li-ion batteries at cold temperatures. This paper also reviews several battery models found in the literature. Finally, thermal strategies are detailed, along with a discussion of the ideal approach to cold-temperature operation. © 2015 Elsevier Ltd.

Discover hidden collaborations