ESTIA

Bidart, France
Bidart, France
SEARCH FILTERS
Time filter
Source Type

Hamwi M.,ESTIA | Lizarralde I.,IMS
Procedia CIRP | Year: 2017

One of the main interest of product-service system (PSS) is its potentiality to minimize the environmental impact of both consumption and production. In the energy sector, Product-Service System has been discussed in the literature as a concept associated with energy efficiency. However, the liberalization of the energy markets and the increasing market share of distributed renewable energy allow ventures and new actors to employ Product-Service System in both decentralized renewable energy generation and demand-side management. This paper is a review paper exploring different business models (BMs) for energy transition. It outlines three major business models: Customer-owned product centered BMs, where the customer owns the product related to the electricity generation or management; Third-party service centered BMs, where a third party offers energy services to the customer; and finally Energy community BMs, where resources are pooled and shared between community members. © 2017 The Authors.


Tabart Q.,École Supérieure des Technologies Industrielles Avancées | Vechiu I.,ESTIA Institute of Technology | Etxeberria A.,ESTIA | Bacha S.,Grenoble Institute of Technology
IEEE Transactions on Industrial Electronics | Year: 2017

Rising demand for distributed generation based on Renewable Energy Sources (RES) has led to several issues in the operation of utility grids. The microgrid is a promising solution to solve these problems. A dedicated energy storage system could contribute to a better integration of RES into the microgrid by smoothing the renewable resource's intermittency, improving the quality of the injected power and enabling additional services like voltage and frequency regulation. However, due to energy/power technological limitations, it is often necessary to use Hybrid Energy Storage Systems (HESS). In this paper, a second order sliding mode controller is proposed for the power flow control of a HESS, using a Four Leg Three Level Neutral Point Clamped (4-Leg 3L-NPC) inverter as the only interface between the RES/HESS and the microgrid. A three-dimensional space vector modulation and a sequence decomposition based AC side control allows the inverter to work in unbalanced load conditions while maintaining a balanced AC voltage at the point of common coupling. DC current harmonics caused by unbalanced load and the NPC floating middle point voltage, together with the power division limits are carefully addressed in this paper. The effectiveness of the proposed technique for the HESS power flow control is compared to a classical PI control scheme and is proven through simulations and experimentally using a 4 Leg 3LNPC prototype on a test bench. IEEE


Tyl B.,APESA | Lizarralde I.,ESTIA
Procedia CIRP | Year: 2017

Nowadays, energy transition is a crucial issue to achieve sustainability. Emergent works emphasize the need to shift from a centralized energy production, based on large-scale production unit, to a more distributed one, based on small-scale and flexible production units. Therefore, energy projects cannot be longer dissociated from territories in order to better fit with local specificities. Moreover, such projects do not only focus on energy supply but also provide a variety of services, being closer to the end-user/citizen than traditional energy companies. The implementation of these territorial energy projects addresses a triple technical, legal and financial challenge, in order to create sustainable value on territories. Indeed, as Product/Service-Systems (PSS), these projects require high investments and the involvement of the future end-user as much as possible. An efficient way to involve the end-user is to allow its participation as a finance provider. This paper focuses on financial challenges and on alternative models to finance renewable energy projects through citizen funding. To do so, we analysed five alternative funding models both on an economic and "end-user/citizen" points of view. Our study underlines the heterogeneity of models in terms of value proposal, citizen involvement, governance or implantation on the territories, and proposes a new classification of these models. © 2017 The Authors.


Legardeur J.,ESTIA | Legardeur J.,University of Bordeaux 1 | Boujut J.F.,French National Center for Scientific Research | Tiger H.,French National Center for Scientific Research
Research in Engineering Design | Year: 2010

This paper presents the results of an empirical study focused on the observation and analysis of an innovative design process. We have had the opportunity to observe and participate in the early phase of a new innovative project within a design office of a truck manufacturer. Our observations based on the actor-network theory highlight the importance of the various design rationales carried by the actors involved. The results of this study show the weakness and complexity of an innovative process within a highly constrained environment. We particularly show that carrying out innovation requires different viewpoints with regard to the object of the design to evolve along with the network of actors and the organisation involved. The issue of product and process integration involving knowledge transfer between actors throughout the design process is also discussed here. As a result, we highlight the importance of rethinking the interface role played by the material expert (in our case) and, in line with other works, we put forward the "interface actor" as the key network actor involved during the early development phases. To provide the network and the interface actor with a means to share information and co-operate during these informal early design phases we propose some features of a new web-based information system and the basis for a debate on the idea lifecycle management concept as a solution to the issue of innovative idea information structuring. © 2010 Springer-Verlag London Limited.


Vechiu I.,ESTIA | Gurguiatu G.,University of Galati | Rosu E.,University of Galati
2010 9th International Power and Energy Conference, IPEC 2010 | Year: 2010

This paper presents a three-phase Active Power Conditioner to improve power quality in microgrids based on renewable energy. A microgrid is a weak electrical grid which can be easily subject to disturbances. The Active Power Conditioner (APC) presented in this paper acts as an interface between renewable energy sources and the AC bus of a microgrid and uses an improved control strategy, which makes possible to inject energy in the microgrid, compensate the current harmonics and correct the power factor. Moreover, the proposed control strategy allows the line current at the point of common coupling (PCC) to be balanced and sinusoidal even when the load is unbalanced. Consequently, the voltage at the PPC becomes balanced. Simulation results show the validity of the innovative control strategy. ©2010 IEEE.


Lartigau J.,ESTIA | Coureau J.-L.,University of Bordeaux 1 | Morel S.,University of Bordeaux 1 | Galimard P.,University of Bordeaux 1 | Maurin E.,CNRS Research Laboratory for Historical Monuments
International Journal of Fracture | Year: 2015

Glued-in-rods in timber structures lead to overcome the use of traditional bolted connections, preserve a large part of the original timber and offer aesthetic benefits. Several research programs were achieved to improve the mechanical knowledge of this technique, exhibiting experimentally the influence of materials and the effect of the geometric configuration. From these experimental results, some design rules predicting the axial strength are available, but a common criterion is still lacking. This paper relates to experimental investigations and finite element computations on glued-in rods, with the aim of providing a better knowledge about their mechanical behavior until failure. An experimental campaign is carried out on single glued-in rod connections. The finite element modeling reproduces the experimental configuration: it exhibits significant normal stress (to the interface) at the onset of the bonding, in comparison with shear stress. Within the framework of equivalent linear elastic fracture mechanics, resistance curves in mode I and mode II are established for each specimen. Finally, a mixed mode fracture criterion (I/II) is used to describe the fracture process zone development at the wood-adhesive interface (failure zone). An analytical formulation is then proposed allowing the evaluation of peak load of each specimen, which highlights a new approach for the design of such connections. © 2014, Springer Science+Business Media Dordrecht.


Latortue X.,ESTIA | Minel S.,ESTIA
Green Design, Materials and Manufacturing Processes - Proceedings of the 2nd International Conference on Sustainable Intelligent Manufacturing, SIM 2013 | Year: 2013

French construction industry is facing radical changes: the new 2012 Thermal Regulations as well as an increasing tendency from decision-makers to select the lowest tender force the constructors to change their practices. Those constraints have a deep impact on the industry. Reconsidering constructors behaviour appears to be essential. Current efforts focus on the adoption of manufacturing concepts including Concurrent Engineering (CE). Implementation of CE fosters a more efficient collaboration and increases the users needs consideration. Using 4D CAD or Building Information Modeling can also be a great contribution. Practices changes should succeed through CE trainings and it is crucial to develop procedures that will be followed by the construction actors. As a conclusion, case studies are rare and studying the implementation conditions of concurrent methodologies in the construction industry appears as a relevant approach to investigate. © 2013 Taylor & Francis Group.


Ghouaiel N.,ESTIA IRIT | Cieutat J.-M.,ESTIA | Jessel J.-P.,CNRS Toulouse Institute in Information Technology
ACM International Conference Proceeding Series | Year: 2014

An augmented reality system is used to complete the real world with virtual objects (computer generated) so they seem to coexist in the same space as the real world. The concept of plasticity [4][5] was first introduced for Human Computer Interaction (HCI). It denotes the ability of an HCI interface to fit the context of use defined by the user, the environment and the platform. We believe that plasticity is a very important notion in the domain of augmented reality. Therefore, we rely on it in order to introduce the concept of adaptive augmented reality. This concept is based on the triplet (user, environment and platform) constituting the context of use. Adaptive augmented reality can foster functional ability, ease of use and portability of new augmented reality applications. Thus, we describe in this paper three applications showing the adaptation of augmentation based on three variables: the scene illumination, the distance to the target and the ambient noise.


Takouachet N.,ESTIA | Legardeur J.,IMS | Lizarralde I.,ESTIA
ACM International Conference Proceeding Series | Year: 2014

Facilitation is proved to improve group problem-solving effectiveness, research new concepts and innovative solutions. This paper addresses facilitation role during a creative session in the digital environment. We evaluate existing collaborative software based on the metaphor of the sticky note and we show that they are designed for use without necessarily taking into account the presence of a facilitator. They offer however, a set of functions that are relevant to the group and its individuals. According to our findings, we suggest a set of principal features to fully integrate the role of the facilitator into digital creativity sessions. Copyright 2014 ACM.


Kreckelbergh S.,ESTIA | Vechiu I.,ESTIA
2012 16th International Conference on System Theory, Control and Computing, ICSTCC 2012 - Joint Conference Proceedings | Year: 2012

This paper presents the first results of the OptimaGRID project which focuses on the design of a micro-grid used for industrial area, namely the Tarnos area of the Bayonne harbor. The objective is to size the electrical sources of the micro-grid according with the harbor needs and test its dynamic operation. For these analyses, HOMER® and EUROSTAG® software have been used. © 2012 Dunarea de Jos University.

Loading ESTIA collaborators
Loading ESTIA collaborators