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PEOPLE@HES-SO – Annuaire et Répertoire des compétences
PEOPLE@HES-SO – Annuaire et Répertoire des compétences

PEOPLE@HES-SO
Annuaire et Répertoire des compétences

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Pauletta Stefano

Pauletta Stefano

Chargé de Ra&D

Compétences principales

Python

Data-Driven Modeling

Numerical analysis and optimization

Solaire thermique

Gestion de projets

Mesure

Prototypage

  • Contact

  • Enseignement

  • Recherche

  • Publications

  • Conférences

Contrat principal

Chargé de Ra&D

Bureau: S05a

Haute école d'Ingénierie et de Gestion du Canton de Vaud
Route de Cheseaux 1, 1400 Yverdon-les-Bains, CH
HEIG-VD

EXPÉRIENCE PROFESSIONNELLE

2021 

Haute Ecole d'Ingénierie et de Gestion du Canton de Vaud (VD,CH); Chargé de Ra&D HES 

2018

 

Services Industriels de Genève (GE, CH) ; Ingénieur de Développement - Projets Thermiques (maitre d'ouvrage delegué et chef de projet du SolarCADII [~2MCHF] et de la refection de l'alimentation en mazout pour une chaufferie de 120MW [~1MCHF])

2007

SRB Energy Research Sarl (c/o CERN, CH) ; Chef de projet (Ingénieur d’affaires ; responsable ingénierie) ; Ingénieur R&D (responsable des applications et du laboratoire solaire).

2005

CERN ; CERN Fellow (procédures de calibration ; mesures magnétiques et laser ; suivi mesures sur aimants du LHC).

2004

Synopsis Consulting (TO, IT) ; Consultant junior (R&D produits ménagères, spectrométrie appliquée ; modèles FEM d’échange de chaleur).

2004

Modulo UNO Spa (TO, IT) ; Ingénieur (certification ATEX et CE).

2001

CERN ; Analyste de données (thèse de MoS en Ingénierie Nucléaire ; monitorage de la production industrielle d’aimants supraconducteurs).

Formation

2002

Ingénierie Nucléaire ; 110/110 ; Ecole polytechnique de Turin, IT.

1994

Bac scientifique ; 60/60 ; Liceo Scientifico Galileo Galilei, Cirié, (TO – IT).

Formation continue

PMI Project Management Basics (2021); Directive ATEX (2004, IT); Ecole de radioprotection (2003, IT); UC USPAS (2003, USA); CERN CAS (2002, IT).

BSc HES-SO en Energie et techniques environnementales - Haute école d'Ingénierie et de Gestion du Canton de Vaud
  • Energie solaire

En cours

TES4DH - Stockage de chaleur pour des réseaux thermiques plus efficaces
AGP

Rôle: Collaborateur/trice

Financement: OFEN; Planair SA; Urbaplan; SIL Services industriels Lausanne; iE; iE

Description du projet : Le projet TES4DH propose d'étudier les applications des stockages de chaleur avec de l'eau pour les réseaux thermiques en Suisse. Trois applications prometteuses ont été identifiées : 1) Couplage sectoriel avec PAC ou centrale de cogénération pour flexibiliser la production/consommation d'électricité, 2) Stockages décentralisés pour soutenir l'extension des réseaux et augmenter les preneurs de chaleur, 3) Stockages de chaleur centralisés pour augmenter la capacité de la chaufferie et éliminer l'utilisation de chaleur fossile lors des pointes de consommation. TES4DH quantifiera les bénéfices énergétiques, économiques et environnementaux des applications proposées et optimisera leur dimensionnement et fonctionnement. Enfin, une analyse des conditions cadres et modèles d'affaires identifiera les freins et les leviers à la mise en ouvre de projets concrets.

Equipe de recherche au sein de la HES-SO: Duret Alexis , Dupont Gabriel , Jobard Xavier , Pauletta Stefano

Partenaires académiques: Solites

Durée du projet: 08.01.2024 - 30.06.2026

Montant global du projet: 199'520 CHF

Statut: En cours

OptiCADSol - Comparaison et optimisation des chaufferies pour des chauffages à distance solaire
AGP

Rôle: Collaborateur/trice

Financement: OFEN (Office fédéral de l'énergie); iE

Description du projet : Comme cela a déjà été montré dans des projets précédents, le couplage d'une installation solaire thermique avec une production de chaleur à bois sur un réseau de chauffage à distance (CAD) permet de réduire la consommation de bois de manière significative. Le but du projet proposé est d'établir les règles de dimensionnement ainsi que les schémas hydrauliques et de régulation permet-tant de réaliser le couplage solaire/bois sans que le fonctionnement de l'installation à bois soit péjo-ré (hausse des émissions de polluants, baisse de rendement, etc.), et sans péjorer la rentabilité du CAD. Ces règles de dimensionnement aideront les planificateurs à dimensionner leurs installations de manière optimale. Enfin une étude sera menée afin de comparer une solution solaire thermique avec une solution photovoltaïque combiné à une pompe à chaleur.

Equipe de recherche au sein de la HES-SO: Baillifard Marc-André , Duret Alexis , Da Riva Enrico , Jobard Xavier , Pauletta Stefano

Partenaires académiques: Verenum

Partenaires professionnels: DH-Energy

Durée du projet: 01.12.2022 - 30.06.2025

Statut: En cours

Terminés

Tâche IEA-SHC 68 - Efficient Solar District Heating Systems
AGP

Rôle: Collaborateur/trice

Financement: OFEN; iE

Description du projet : The objective of Task 68 is to promote the use of solar heat in DHN and to support the penetration of solar heat. Task 68 pursue mainly four objectives: 1. Efficiently providing the heat at the desired temperature level of district heating grids either directly through solar technologies or indirectly through a combination with other technologies (e.g. heat pumps) focusing on the system aspect. 2. Increasing the degree of digitalization of SDH systems in order to achieve a more efficient integration into district heating systems and a more efficient processing and use of data for evaluation, advanced controls and automatic fault detection. 3. Reducing costs of solar thermal plants to increase their economic attractiveness and competitiveness, and developing new financing and business models. 4. Disseminating the knowledge and results about the potential, areas of application, different solar technologies and their efficient combination with other technologies

Equipe de recherche au sein de la HES-SO: Duret Alexis , Jobard Xavier , Pauletta Stefano

Durée du projet: 02.10.2022 - 31.03.2025

Montant global du projet: 27'950 CHF

Statut: Terminé

Solar energy neighborhoods ' Optimal design and operation of heat, cold and electricity supply on the neighborhood scale
AGP

Rôle: Collaborateur/trice

Financement: OFEN (Office fédéral de l'énergie); Provision 2022; iE

Description du projet : This project aims to develop smart planning methods and control strategies for high-performance solar neighborhoods. The supply with heat, cold and electricity of such neighborhoods shall make optimal use of solar energy technologies, storage solutions, and the interconnection of the buildings via electrical and thermal grids. A special focus is on the winter heat supply, and the search for effi-cient alternatives to air/water and geothermal heat pump systems. Exploiting synergies and sector coupling at the neighborhood scale will allow to reduce the carbon-intensive winter electricity de-mand and to provide a high load and production flexibility towards the electricity grid. The technical approach is the development of efficient computational models that allow a) to com-pare a large number of system variants in the design phase with regard to different objective func-tions (costs, emissions, grid flexibility) and b) to realize model-predictive control strategies on a neighborhood scale.

Equipe de recherche au sein de la HES-SO: Duret Alexis , Lasvaux Sébastien , Pham Stéphanie , Capezzali Massimiliano , Fesefeldt Marten , Jobard Xavier , Clot Nathalie , Goulouti Kyriaki , Pauletta Stefano , Frossard Mija

Partenaires académiques: SPF Institut für Solartechnik

Partenaires professionnels: ponzio solar SA

Durée du projet: 01.11.2021 - 30.11.2024

Montant global du projet: 142'300 CHF

Statut: Terminé

Fostering increased DHN penetration: maximizing renewable share, decreasing temperature levels, identify synergies and integrate multiple injection points on the territory
AGP

Rôle: Collaborateur/trice

Requérant(e)s: iE, Capezzali Massimiliano, iE

Financement: DIREN; VS - Institut Energie et environnement; Auto-fin IESE; Services Industriels de Lausanne; SFOE; Services Energies Yverdon

Description du projet : District heating networks (DHN) represent a crucial technology to attain significantly lower carbon footprint of the heating sector. Existing grids and their extensions, as well as new projects, are ex-pected to decrease distribution temperature levels decrease, in order to both improve efficiency and integrate a larger share of renewable and waste heat energy sources. The latter need to be quantita-tively characterized in order to be optimally integrated. In parallel, the potential synergies existing among small networks ' e.g. covering a few building blocks or one neighbourhood - need to be exploited, in terms of resources temporal availability and specific demand load profiles, in order to provide dynamic support, including possible storage capacities. FOSTER_DHN aims at developing the corresponding multi-grid and multi-temperatures design and simulation approaches as to gain a systemic understanding of DHN deployment and provide decision-support for local authorities and utilities.

Equipe de recherche au sein de la HES-SO: Duret Alexis , Gendre Fabrice , Eicher Sara , Capezzali Massimiliano , Fesefeldt Marten , Jobard Xavier , Pauletta Stefano

Partenaires académiques: iE; Capezzali Massimiliano, iE

Durée du projet: 01.12.2022 - 31.10.2024

Montant global du projet: 262'165 CHF

Statut: Terminé

Couplage direct d'un champ de modules PVT avec un système PAC utilisant des réfrigérants naturels pour le chauffage des bâtiments d'habitation collectif et la production d'eau chaude sanitaire
AGP

Rôle: Collaborateur/trice

Financement: OFEN; Socle HEIG-VD Ra&D; iE; iE

Description du projet : L'objectif du projet TrisSolHP est de développer et d'évaluer les performances énergétiques, financières et environnementales, d'un système modulable de production de chaleur pour les bâtiments collectifs existant combinant en série une installation PVT avec une PAC R744 pour la production d'ECS et une PAC R290 pour le chauffage. L'utilisation de collecteur PVT spécialement optimisé pour maximiser l'échange de chaleur convectif avec l'air, permet de limiter la surface nécessaire. La combinaison de PAC utilisant des réfrigérants naturels permet de conserver de bons COP pour la production d'ECS et pour le chauffage sur une large gamme de température de source froide. Un COP annuel de 3.5 est visé. Le système de chauffage TriSolHP représente une alternative attrayante au PAC Air/Eau et pourrait contribuer à la décabornisation de la production de chaleur des bâtiments collectifs existants. Ce concept permet aussi de maximiser l'utilisation des toitures pour valoriser la ressource solaire.

Equipe de recherche au sein de la HES-SO: Duret Alexis , Dupont Gabriel , Da Riva Enrico , Guillaume Martin , Jobard Xavier , Pauletta Stefano

Partenaires professionnels: Groupe Système Energétique (GSE), UNIGE

Durée du projet: 01.09.2021 - 31.10.2023

Montant global du projet: 167'786 CHF

Statut: Terminé

2024

Dynamic simulation and life cycle analysis of a 784m2 solar thermal plant with evacuated flat plate collectors coupled to a district heating network
Article scientifique ArODES

Alexis Duret, Xavier Jobard, Stefano Pauletta, Sébastien Lasvaux, Mija Frossard, Gauthier Demonchy

Thermal Science,  2024, 28, 5 Part B, 4369-4379

Lien vers la publication

Résumé:

One of the first solar plants in Switzerland to be integrated to a large urban district heating network has been monitored since its commissioning in 2021. Located in Geneva, this 784 m² solar field, equipped with innovative evacuated flat plate collectors, has confirmed the potential of vacuum solar collectors for industrial and district heating network applications. In 2022, the plant achieved a specific annual production of 684 kWh per m², corresponding to a 45% yearly average efficiency. A dynamic numerical model, developed under TRNSYS and validated against measurement data, allowed investigating the impact of several optimization strategies together with their economic viability. Additionally, a life cycle assessment and a life cycle cost analysis were conducted, confirming that incorporating solar heat into district heating network significantly reduces GHG emissions and non-renewable energy consumption at an energy production cost which is competitive with that of current district heating networks. These findings underscore the potential of solar thermal technology in decarbonating the thermal energy sector, notwithstanding its limited role in the current energy production arena.

2023

Performance measurements on WISC collectors under artificial environmental conditions
Article scientifique

Pauletta Stefano, Duret Alexis, Dupont Gabriel, Jobard Xavier

Journal of Physics Conference Series 2600(4):042014, 2023

Résumé:

In the framework of the TriSolHP project, aimed at estimating the impact of improved heat pump technologies for decarbonization of non-retrofitted multifamily buildings in urban districts, a new type of PVT WISC (a photovoltaic-thermal wind and/or infrared sensitive collector) has been extensively tested in a climatic room without light input. The measurement campaign focused on the impact of airflow over the collector heat transfer coefficient for different installation layouts and when covered in ice. Measurement data were compared to TRNSYS simulations to gain an insight over the uncertainties affecting the performance models available in literature for this type of WISC.

2016

A Solar Fresnel Collector Based on an Evacuated Flat Receiver
Article scientifique

Pauletta Stefano

Energy Procedia, 2016

Résumé:

Fresnel solar collectors constitute one of the types of line-focus collector systems which have been adopted worldwide for solar power production: ground-mounted mirror strips follow the sun to concentrate its rays onto a fixed receiver. Its constructive simplicity offers advantages which balance the loss in aperture efficiency and concentration ratio when compared to the Parabolic Trough technology. This article presents the design of a Linear Fresnel concentrator equipped with the flat evacuated solar collector developed at CERN and industrially manufactured in Valencia (Spain). The Flat Receiver Linear Fresnel concentrator has been optically modelled using a ray trace code and optimized trough Taguchi method applied to the annual solar yield of a solar power plant installed in Cairo. Available costing data on the typical CSP electricity generation island and on multi-effect desalination technology has then been adopted for the estimation of the levelized cost of electricity and co-produced fresh water.

2024

Optimizing energy and economic performance of solar-biomass systems for rural district heating :
Conférence ArODES
a technical and financial analysis

Xavier Jobard, Stefano Pauletta, Alexis Duret, Quentin François

EuroSun 2024 Proceedings

Lien vers la conférence

Résumé:

This article investigates the integration of large-scale solar thermal fields with biomass boilers for district heating (DH) in rural areas, aligning with the principles of 4th Generation DH. Using TRNSYS 17 software, the technical and economic aspects of this integration were analyzed. The technical assessment revealed high specific solar productivities over 850 kWh.m-2 for small solar fractions and a corresponding optimum specific volume of the Thermal Energy Storage (TES). The economic analysis demonstrated the viability of solar installations in various scenarios, with the potential for levelized costs of heat (LCOH) to be under 100 CHF/MWh. Overall, the study concludes that integrating solar thermal systems with wood chip boilers is technically feasible and financially advantageous. However, careful consideration of system configuration and financing is necessary for sustainable and high-performance solutions, ensuring optimal resource utilization and economic viability.

SunPeek open-source software for ISO 24194 performance assessment and monitoring of large-scale solar thermal plants
Conférence ArODES

Daniel Tschopp, Philip Ohnewein, Marnoch Hamilton-Jnes, Peter Zauner, Lukas Feierl, Maria Moser, Michael Zellinger, Christian Kloibhofer, Martin Koren, Stefan Mehnert, Alexis Duret, Xavier Jobard, Stefano Pauletta, Frederico Giovannetti, Bert Schiebler

International Sustainable Energy Conference (ISEC 2024) - Proceedings

Lien vers la conférence

Résumé:

ISO 24194:2022, the first standard specifically designed to assess the operational performance of solar thermal collector arrays, is likely to have substantial impact on the entire solar thermal industry. This standard introduces the Power Check, a method that can be used for monitoring ongoing plant operation and for checking performance guarantees. However, its practical use is presently limited, as initial applications indicate a need for clarification, and it exists as a mere paper description, rendering it less accessible for plant designers and operators. Furthermore, any implementation necessitates practical decisions regarding data handling and algorithm implementation. Closed-source implementations, lacking a traceable and transparent framework, could lead to inconsistent results. To address these issues, this paper introduces SunPeek, an open-source software that provides a reference implementation of the ISO 24194 Power Check. SunPeek is freely accessible for both scientific and commercial purposes. This paper also discusses existing limitations of ISO 24194 and showcases five examples of SunPeek applied to real-life solar thermal plants. This underscores potential practical challenges, such as handling stagnation events, and highlights methodological progress, such as improved data filtering for performance analyses. The findings and applications indicate SunPeek’s usability and the high potential for ISO 24194-based performance monitoring of solar thermal plants.

2023

Performance measurements on WISC collectors under artificial environmental conditions
Conférence ArODES

Stefano Pauletta, Alexis Duret, Gabriel Dupont, Xavier Jobard

Journal of Physics: Conference Series ; Proceedings of cisbat 2023, the built environment in transititon, Hybrid International Scientific Conference

Lien vers la conférence

Résumé:

In the framework of the TriSolHP project, aimed at estimating the impact of improved heat pump technologies for decarbonization of non-retrofitted multifamily buildings in urban districts, a new type of PVT WISC (a photovoltaic-thermal wind and/or infrared sensitive collector) has been extensively tested in a climatic room without light input. The measurement campaign focused on the impact of airflow over the collector heat transfer coefficient for different installation layouts and when covered in ice. Measurement data were compared to TRNSYS simulations to gain an insight over the uncertainties affecting the performance models available in literature for this type of WISC.

2022

Performance monitoring of an 800m2 solar thermal plant with evacuated flat plate collectors coupled to a DHN
Conférence ArODES

Alexis Duret, Xavier Jobard, Gauthier Demonchy, Stefano Pauletta

Proceedings of EuroSun 2022

Lien vers la conférence

Résumé:

The performances of a 800 m2 solar thermal plant coupled to a large District Heating in Geneva has been monitored for more than one year. The solar field is composed of 400 high performance evacuated flat plate collectors manufactured by TVP Solar. It has an average operating temperature above 80°C. This plant has been equipped with sensors to monitor and follow its performances over time. In 2021, the solar plant has injected 536 MWh in the DHN which corresponds to a specific yearly productivity of 684 kWh/m2 /y or 45 % of average efficiency. Performances were compared between 2021 and the first half of 2022, with no observed performance degradation. The monitoring will be pursued at least until the end of 2024.

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