Stéphane Gibout

Stéphane Gibout
Université de Pau et des Pays de l'Adour | UPPA · Laboratory Thermal Energy Processes

Associate Professor

About

76
Publications
23,538
Reads
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934
Citations
Citations since 2016
34 Research Items
766 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Additional affiliations
September 2000 - present
Université de Pau et des Pays de l'Adour
Position
  • Professor (Assistant)

Publications

Publications (76)
Preprint
With increasing constraints on energy and resource markets and the non-decreasing trend in energy demand, the need for relevant clean energy generation and storage solutions is growing and is gradually reaching the individual home. But small-scale energy storage is still an expensive investment in 2022 and the risk/reward ratio is not yet attractiv...
Article
This paper presents the PEACEFULNESS software platform (Platform for transvErse evAluation of Control stratEgies For mULti-eNErgy Smart gridS), an open framework dedicated to multi-energy smart-grids, based on a techno-economic model that integrates economic considerations (contracts). As such, it is mainly oriented towards the evaluation of multi-...
Article
Full-text available
Hydrogen has been identified as a very promising vector for energy storage, especially for heavy mobility applications. For this reason, France is making significant investments in this field, and use cases need to be evaluated as they are sprouting. In this paper, the relevance of H2 in two storage applications is studied: a domestic renewable ele...
Article
Greenhouse cultivation is a form of modern agriculture in which crops are grown under a controlled environment to obtain higher yields and better crop quality. Implementing solar technologies in a greenhouse application would help to enhance its performance sustainably. This study presents a survey and evaluation of photovoltaic (PV), solar thermal...
Article
Full-text available
This study presents an experimental comparison of three characterization methods for phase change materials (PCM). Two methods were carried out with a calorimeter, the first with direct scanning (DSC) and the second with step scanning (STEP). The third method is a fluxmetric (FM) characterization performed using a fluxmeter bench. For the three met...
Article
Demand-side management and load-shifting strategies can reduce peak loads as well as temporal production/consumption mismatch, two classic issues in district energy networks that integrate solar sources. Nevertheless, the classic current sizing methods for such networks only consider the total demand, and not the possible loads after use of such te...
Conference Paper
Nowadays, the optimized operation of District Heating Networks (DHN) by means of Demand-Side Management (DSM) has begun to be considered. However, it is rarely considered for the initial design or the possible extension of a DHN, though it could reduce the sizing of production units due to shifts or curtailments of some consumptions (specifically d...
Conference Paper
In the struggle for more sustainable energy generation, several approaches are currently explored. Among them, combined heat and power (CHP) appears as an interesting candidate. First because it obviously permits to produce simultaneously heat and electricity. And, second, because it allows the use of gas, natural gas or more interestingly syngas,...
Article
This research focuses on the potential of greenhouse cultivation in circumpolar territories. It begins with a survey that encompasses most of the northern greenhouses in North America. This review emphasizes the need for appropriate data and for the right energy system design. Next, the paper focuses on a case study located in Nunavik, which is the...
Conference Paper
When dealing with energy networks, the current trends are oriented towards the smart grids. Basically, they introduce more flexibility in order to soften the transition from fossil or nuclear plants to renewable ones. Moreover, and whatever the type of production (renewable or not), smart grids also aim at decreasing the peak consumption to avoid t...
Conference Paper
In traditional models of energy production, producers have to adapt in real-time to the demand. Mean- while, more and more renewable plants are installed, yet most of them are intermittent and diffuse. This creates an additional burden, first, for the Transmission and Distribution System Operators (TSO & DSO), and second, for the efficient use of t...
Conference Paper
Nowadays, sizing of renewable decentralized thermal and electrical production units/systems does not take into account the current opportunities offered by demand-side management strategies. This latter one, by reducing peak loads and the mismatch between production and consumption, questions the classic design methods. Such possibilities lead to a...
Article
This paper shows, for the first time, the optimisation of the electrical supply in off-grid systems by means of hybrid renewable systems (photovoltaic + wind + battery + fossil fuel) including thermoelectric generator (which source of heat is the exhaust gas of a stove used for cooking or heating). The objective is to minimise the net present cost....
Article
Full-text available
The determination of both the thermal and thermodynamical properties of a composite material containing phase change material is done thanks to an inverse method, which combines experimental measurements and numerical computations. Given first an in-house experiment, which allows us to test samples at a macroscopic scale (i.e., close to the real co...
Article
The main challenge of working with thermoelectric generators lies in their low efficiency, so finding the optimal design to achieve the best thermoelectric generator (TEG) performance under the working conditions becomes a strong problematic. In this study, a numerical transient simulation tool was developed using different modelling techniques to...
Conference Paper
The main challenge of working with thermoelectric generators lies in their low efficiency, so finding the optimal design to achieve the best thermoelectric generator (TEG) performance under the working conditions becomes a strong problematic. In this study, a numerical transient simulation tool was developed using different modelling techniques to...
Article
Full-text available
Adjusting to global climate and socio-environmental changes has become a major issue for many societies, especially in the Arctic. Many Inuit wish to better understand the changes taking place. In 2013, an international Observatory of Human–Environment Interactions (OHMi) was established in Nunavik to identify these changes, study their cumulative...
Article
Differential scanning calorimetry is a classic tool used to characterize materials, and in particular to estimate the energies involved during phase transitions. This determination of latent heat is difficult because the exploitable signal (i.e. the power absorbed/released by the sample over time) reflects the overall behavior of the sample subject...
Article
Disruptions in the way of life of indigenous peoples from the Far North have greatly affected their ability to meet their food needs. The implementation of community greenhouse and gardening projects is one of the initiatives taken to address this issue in Nunavik. Through a mixed-method approach, we analyze social benefits and challenges, as well...
Article
Full-text available
Modeling the thermal behavior of a plant or devices using Phase Change Materials (PCM) requires to know their thermophysical properties. The Differential Scanning Calorimetry (DSC) is a technic largely used to investigate them. However, under the pretext to experiment with small samples, some authors consider the DSC curves as directly representing...
Article
Solar thermal energy storage is used in many applications, from building to concentrating solar power plants and industry. The temperature levels encountered range from ambient temperature to more than 1000 °C, and operating times range from a few hours to several months. This paper reviews different types of solar thermal energy storage (sensible...
Article
Dendritic growth is one of the most common microstructures in metal and solution solidification. The subject of dendritic growth has received much attention from both scientific and industrial points of view. On the one hand, dendritic growth has become a deeply investigated subject in non-linear dynamics field. On the other hand, its understanding...
Conference Paper
En raison de l’utilisation de plus en plus répandue des outils de simulation, la question de la valeur des paramètres thermodynamiques devient prégnante; par exemple, l’enthalpie d’un matériau à changement de phase (MCP). Pour l’obtenir, la méthode STEP a une certaine popularité : l’enthalpie est construite en intégrant la réponse thermique du maté...
Conference Paper
Full-text available
A two dimensional front-tracking method is developed in order to model dendritic growth during solidification processes of pure substances. The method uses a sequential set of moving marker points to describe and track the liquid-solid interface which evolves over a fixed background mesh describing the whole medium. The code behaviour is first chec...
Article
Recent studies concerning phase change material (PCM) characterization show that important errors occur if differential scanning calorimetry (DSC) experiments are misinterpreted. Therefore, it is important to know the influence of such misinterpretation on system modeling. The present work deals with phase change materials integrated in building st...
Technical Report
Benchmarking of multicomponent fluids undergoing liquid/vapor phase changes
Article
Full-text available
The support of this study is a cement mortar containing a micro-encapsulated phase change material (PCM). The aim of this article is to identify by an inverse method the thermophysical properties of this composite material and all the parameters that are needed to build a physical model able to simulate the thermal behavior of a material containing...
Article
Abstract When dealing with high-pressure releases, be it needed by some operating conditions or due to an emergency protocol or even to the occurrence of an accident, one has to consider the relevant risks associated to this leakage. Indeed, in addition to the mechanical and blast effects, the dispersion of the released fluid is of primary importan...
Article
The objective of this study is to evaluate three different phase change models used to predict the energy behaviour of a PCM cement mortar sample. Reference data are measured on large samples of composite material using a special experimental set-up. The phase change models tested are: the apparent specific capacity method, the enthalpy method assu...
Article
Full-text available
In this paper, a model is developed in order to determine the melting thermogram of a binary mixture, presenting a solid solution. Considering the case of an ideal solution, whose enthalpy function is analytically derived, we highlight the large differences existing between the thermogram and the derivative of the enthalpy function. The influence o...
Article
The use of phase change materials (PCMs) to increase solar domestic hot water (SDHW) system efficiency has been already studied by different ways. Some studies place the storage material in the water tank, others directly in the solar thermal collector. However both of them show that the effectiveness of such a use is not relevant. This paper is de...
Article
Full-text available
The aim of this paper is to present an inverse identification method to determine specific enthalpy of PCM from calorimetry experiments. We will focus on the cases of pure substances and ideal binary solutions including the eutectic equilibrium. The corresponding direct model, based on energy balance, is first presented. A classical enthalpy method...
Article
Thermal energy storage is now a key parameter to overcome the delay between energy supply and demand in many applications. To address this issue, the use of phase change materials (PCM) tends to be more and more common. Given the attempted objectives of such applications, performances of the PCM are a cornerstone of the whole system. Therefore, a c...
Article
Full-text available
Current challenges in the energy storage often involve phase change materials. Therefore, there is a real need for accurate determinations of their intrinsic properties. Regularly, differential scanning calorimetry is used to perform such a goal. Nevertheless, to obtain fair results, one needs to consider the transfer phenomenon inside the sample a...
Conference Paper
Full-text available
In this paper, an exergy cost analysis method based on the structural theory of thermoeconomics is applied to a multifunctional heat pump system, which offers the basic functions of domestic hot water DHW and hydronic heating, together with ventilation. The thermoeconomic model for the system based on the fuel–product concept is defined to quantify...
Article
Among the various ways to simulate compressor behaviour, using efficiency definitions such as volumetric, isentropic or effective is relatively easy to perform and rapid when dynamic simulation is required. Calculating these efficiencies and their dependence on operating pressure, refrigerant type, and temperature is on the contrary relatively diff...
Conference Paper
Full-text available
L’introduction de matériaux à changement de phase dans les systèmes de production d’eau chaude sanitaire est actuellement une voie explorée pour essayer d’en augmenter les performances. Cependant la preuve de l’efficacité d’une telle adaptation n’a pas encore été apportée de façon certaine. Les notions d’efficacité et d’optimum peuvent d’ailleurs r...
Article
This paper presents some results obtained by Differential Scanning Calorimetry (DSC) for characterizing the phase transition within an emulsion. The dispersed substances are either hexadecane, octadecane, water or binary solution. A non-equilibrium model taking into account the inter-phase heat transfer between the emulsifying medium and the dispe...
Conference Paper
Full-text available
Généralement dimensionnés au point nominal, la majorité des systèmes énergétiques fonctionnent pourtant en régime variable. Comprendre leur comportement instationnaire est toutefois primordial tant pour en estimer les performances que pour en optimiser la conception. Nous présentons ici un outil logiciel générique et modulaire permettant la simulat...
Article
We present in this paper a new method of determining the nucleation probability J(T) of a supercooled liquid dispersed within an emulsion, based on the analysis of the thermogram obtained during a regular cooling. The thermal behaviour of the sample during the cooling is modelled in order to calculate the thermogram and so to compare it with the ex...
Conference Paper
Full-text available
When considering thermodynamic conversion of solar energy into electric energy (up to maximum 50 kWe), the coupling of a two stages low cost parabolic trough concentrator with a low technology, middle ΔT reciprocating Joule cycle air engine (i.e. an Ericsson hot air engine in open cycle), is quite promising. A thermodynamic model shows that there i...
Article
We present a new technique to globally optimize stirring and mixing in three-dimensional spatially periodic laminar flows. This technique includes a recently developed mapping method and the use of an optimization method. The method gives the opportunity of the statistics of scalar dissipation for multiple stirring protocols. Exhaustive tests, firs...
Conference Paper
Full-text available
L’utilisation rationnelle de l’énergie représente un enjeu majeur pour les années à venir. Une alternative à l’utilisation de l’électricité à des fins de climatisation réside dans la mise en œuvre de systèmes à absorption consommateur de chaleur. Dans cet article, nous présentons un modèle développé pour l’étude du comportement dynamique d’une mach...
Article
The main objective of this paper is to present a model for the heat transfer in the case of the melting of saline binary solution. This model is applied to calorimetry in order to determine the kinetics of the eutectic melting. The investigated cell containing the solution is a cylinder of a few mm3 in volume. By simulation, we could replicate the...
Conference Paper
Full-text available
Absorption refrigeration has received increased attention in recent years and many kinds of machines are available on the market. As long as steady state conditions are concerned, sizing a unit does not represent a real difficulty. On the contrary, predicting the behaviour of a selected model over time far from these conditions or under unsteady st...
Conference Paper
Full-text available
Le dimensionnement optimal des systèmes thermiques utilisés dans les procédés énergétiques nécessite la maîtrise des échangeurs thermiques mis en jeux dans leur fonctionnement stationnaire mais aussi lors des phases non nominales de changement de régime (phases de démarrage, variation de charge,…). Ces comportements rendent délicat le contrôle de l...
Article
Full-text available
A new method of determination of the nucleation probability of undercooled liquid dispersed within an emulsion is presented. The nucleation probability is a nonlinear function of the temperature depending on two parameters acting very differently. The aim of this paper is to present a method to determine these parameters by an inverse analysis of t...
Article
Full-text available
A new mapping method is presented for studying the mixing dynamics in 3D spatially periodic curved pipe flows. Anisotropic unstructured meshes are used to map the deformation of fluid elements between inlet and outlet pipe cross-sections of a curved pipe element. The chaotic mixing is obtained by the twist in space of different curved pipe elements...
Article
Full-text available
Résumé – Le but de notre travail est de mieux comprendre les phénomènes intervenant lors de la cristallisation de matériaux à changement de phase à l'aide d'un couplage entre la mesure de l'évolution de la température du matériau et la visualisation du mécanisme de cristallisation. La présente étude s'intéresse à l'influence de divers paramètres (v...

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Projects

Projects (6)
Project
Combined legal, physical and economical analysis of mixed smart grids, coupling electrical and heat/cold networks, together with high integration of renewables and use of combined heat and electrical storages
Project
The industrial sector is responsible for large releases of low temperature heat (between 0 and 150°C). Indeed, considering all the French industrial processes, the amount of energy lost in this temperature range is estimated at 75 TWh / year. Recovering this waste heat is complicated because in a large number of industrial processes, there is time delay between the process step in which the energy is lost and the (process step) one in which this energy could be recovered. A thermal storage system could then be integrated in the process to match the energy demand and its production. This would lead to a reduction in the consumption of primary energy. The solution of thermal energy storage using Phase Change Material, also known as PCM, appears particularly attractive to value fatal heat. Indeed it combines significant volume and mass storage capacities and the possibility of releasing energy at a constant temperature. These two criteria are particularly suited for the heat recovery of batch processes, also called batch methods. However the implementation of these storage systems is fraught with scientific and technological barriers, in the thermal characteristics of the storage material as well as the system, or its command and control of its insertion in industrial processes. In industrial research framework, the objective of Thermal Storage project for Eco-Efficient Process (STEEP) is to develop a storage system using solid-liquid PCM in a temperature range between 80 and 140°C.
Project
The study of energy systems integrating PCMs requires a detailed knowledge of the phase transition process. It is therefore essential to determine with precision the thermo physical characteristics of the materials. However, calorimetric methods are not always accurate enough, especially for characterizing mixtures. This is why we are working on characterizing PCMs using identification methods (reverse methods or genetic algorithms) that give results that are more consistent with the physics of phase changes.