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Frossard Mija

Chargé de Ra&D HES

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Chargé de Ra&D HES

Desktop: S128a

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

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Ongoing

S-DSM - Sustainable Demand Side Management for a low Carbon Footprint operation of Buildings

AGP

Role: Collaborator

Financement: Office Fédéral de l'Energie (OFEN); iE

Description du projet : With technologies to achieve the Energy Strategy 2050, the energy demand profile of buildings is changing. However, we are still dependent on electrical energy from the grid. The carbon footprint of this grid not only fluctuates seasonally, but also strongly within a day. Here, this carbon footprint is applied to a predictive controller at the DSO and energy contractor level into the building operation of two buildings; the K3 complex in Wallisellen and the NEST demonstrator at Empa.

Research team within HES-SO: Citherlet Stéphane , Lasvaux Sébastien , Jobard Xavier , Goulouti Kyriaki , Frossard Mija

Durée du projet: 01.01.2021 - 31.12.2024

Montant global du projet: 32'000 CHF

Publications liées:

EcoDynElec : Open Python package to create historical profiles of environmental impacts from regional electricity mixes

Statut: Ongoing

Identification of the potential to reduce the environmental impacts through the reuse of materials for Swiss buildings (Reuse-LCA)

AGP

Role: Collaborator

Requérant(e)s: iE, Lasvaux Sébastien, iE

Financement: ETHZ; SIG; Socle HEIG-VD Ra&D; Auto fin. IGT; OFEN; Baubüro in situ AG; Architekturbüro K. Pfäffli; Ville de Zürich; Primeo Energie

Description du projet : The main focus of the Reuse-LCA project is to analyze the potential environmental gains (non-renewable energy and GHG emissions) that the reuse of materials entails, in buildings. Several design alternatives of pilot buildings (new constructions and energy-related refurbishments) situated in different regions in Switzerland are studied in detail. Thus, along with the financial costs of the reuse, the potential environmental gains of reuse, combined with other low-carbon strategies are, also, evaluated.

Research team within HES-SO: Périsset Blaise , Citherlet Stéphane , Favre Didier , Lasvaux Sébastien , Goulouti Kyriaki , Frossard Mija , Demonchy Gauthier

Partenaires académiques: iE; Lasvaux Sébastien, iE

Partenaires professionnels: CPEG; DGIP Direction générale immeubles et du patrimoine; Immobilien Basel-Stadt; Axa Investment Managers ; Losinger Marazzi AG; SBB AG

Durée du projet: 01.01.2021 - 31.01.2025

Montant global du projet: 220'786 CHF

Statut: Ongoing

Completed

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

AGP

Role: Collaborator

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.

Research team within 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: Completed

OPTIM-EASE - Optimisation de la gestion énergétique d'ensemble de bâtiments incluant les impacts environnementaux et le couplage sectoriel

AGP

Role: Collaborator

Financement: Fachhochschule Ostschweiz; Romande Energie SA; Office Fédéral de l'Energie (OFEN); Energie 360° AG ; St.Galler Stadtwerke - SGSW; Provision 2022; iE

Research team within HES-SO: Wagner Guy , Duret Alexis , Loperetti Murielle , Lasvaux Sébastien , Pham Stéphanie , Capezzali Massimiliano , Fesefeldt Marten , Jobard Xavier , Clot Nathalie , Goulouti Kyriaki , Pauletta Stefano , Frossard Mija , Demonchy Gauthier

Partenaires professionnels: Helion Solar Ouest SA; Swissolar; VSG Verband der Schweiz. Gasindustrie; Powerloop - Schweizerischer Fachverband

Durée du projet: 01.02.2021 - 31.10.2023

Montant global du projet: 141'614 CHF

Statut: Completed

OPTIM-EASE - Optimisation de la gestion énergétique d'ensemble de bâtiments incluant les impacts environnementaux et le couplage sectoriel, financement FOGA

AGP

Role: Collaborator

Requérant(e)s: iE

Financement: FOGA; Provision 2022

Description du projet : Le concept énergétique optimal d'un groupe de bâtiments est différent de la somme des concepts optimaux des bâtiments considérés séparément. Le projet OPTIM-EASE développe un cadre méthodologique permettant l'optimisation énergétique de groupes de bâtiments en utilisant leurs synergies. En comparant la solution optimale d'un groupe de bâtiments avec la somme des solutions optimales des bâtiments individuels, les gains économiques et environnementaux de l'agrégation de bâtiments sont caractérisés. il s'agit, ici du financement accordé par le FOGA pour étudier spécifiquement dans le cadre du projet OPTIM-EASE, les aspect liés au gaz renouvelable: - Quantifier la contribution du gaz renouvelable au virage énergétique suisse en réduisant l'impact environnemental de la demande énergétique des groupes de bâtiments (thermique et électrique) - Développement de systèmes multi-énergie décentralisés pour des groupes de bâtiments comprenant des appareils fonctionnant au gaz renouvelable (cogénération, chaudière à gaz à haut rendement, petit réseau de chauffage urbain, etc.) - Identification des options les plus appropriées pour l'intégration du gaz renouvelable dans le concept énergétique via des méthodes d'optimisation multi-objectif, y compris la minimisation des coûts et de l'impact environnemental

Research team within HES-SO: Wagner Guy , Duret Alexis , Loperetti Murielle , Lasvaux Sébastien , Pham Stéphanie , Capezzali Massimiliano , Bürer Mary Jean , Fesefeldt Marten , Jobard Xavier , Goulouti Kyriaki , Frossard Mija

Partenaires académiques: Fachhochschule Ostschweiz; iE

Durée du projet: 31.10.2023 - 31.10.2023

Montant global du projet: 82'000 CHF

Statut: Completed

NextEarthBuild ' « Une nouvelle génération d'éco-construction en terre d'excavation recyclée »

AGP

Role: Collaborator

Requérant(e)s: FR - EIA - Institut iTEC

Financement: HES-SO Rectorat

Description du projet : Pour rendre possible une densification urbaine durable tout en maintenant une qualité de vie acceptable, il est indispensable de repenser la manière et la matière dont les bâtiments et les aménagements sont conçus et construits. Parmi les déchets de la construction qui ne sont pas valorisés, la terre d'excavation présente le volume le plus important. Ce projet, réalisé en collaboration avec la Haute École d'Ingénierie et de Gestion du canton de Vaud (HEIG-VD), vise à faire de la terre d'excavation une nouvelle matière première qui offre une solution pragmatique et rentable au problème de la construction de bâtiments et des aménagements extérieures, tels que les parkings et les chemins piétons, souvent réalisées en béton ou en mortier silico-calcaire. La terre d'excavation pourrait donc devenir : - le composant incontournable d'une nouvelle technique de construction et de préfabrication appelée shotearth (terre projetée) ; - l'ingrédient qui rend végétalisables et auto-recyclables des nombreux aménagements extérieurs. Ce projet a pour but de développer des nouvelles manières de concevoir et de construire avec la terre d'excavation, grâce à : - l'utilisation de techniques de fabrication innovantes (projection classique, impression 3-D d'élément complexes) ; - l'optimisation des matériaux, alliant performances et éco-compatibilité ; - l'optimisation de la forme et du lien entre forme et fonction.

Research team within HES-SO: Leopold Sebastian , Galé Benjamin Claude , Delaquis Dominique , Redaelli Dario , Lasvaux Sébastien , Murith Noé , Savino Vincenzo , Bourrier Hervé , Schranz Noè , Albertoni Loran , Agustoni Amedeo , Goulouti Kyriaki , Viviani Marco , Frossard Mija

Partenaires académiques: INSIT; IGT; FR - EIA - Institut iTEC; FR - EIA - Institut SeSi

Partenaires professionnels: Pittet

Durée du projet: 01.01.2019 - 30.09.2022

Montant global du projet: 232'000 CHF

Statut: Completed

Open Data Co2 60995.1 INNO-EE

AGP

Role: Collaborator

Requérant(e)s: MEI, Rappo Daniel, MEI

Financement: Innosuisse

Description du projet : Permettre aux entreprises d'estimer leur empreinte CO2 grâce aux outils comptables qu'elles utilisent au jour le jour. Les bilans CO2 sont utiles en créant un moment durant lequel l'entreprise se questionne sur sa pratique et se fixe des objectifs. Entre ces audits, il n'y a pas d'outil simple de suivi des impacts environnementaux des activités. C'est ce problème que notre application de comptabilité CO2 propose de corriger en offrant une solution facile à intégrer qui calcule automatiquement, sur la base de valeurs reconnues, les émissions de gaz à effet de serre des activités d'une entreprise. Notre outil sera intégré comme module à la solution Open Source Odoo, largement utilisée comme ERP et logiciel de comptabilité. Dans toutes les entreprises, la comptabilité enregistre au quotidien toutes les actions, et les converti en unité monétaire, nous proposerons donc une application qui permet d'enregistrer cette comptabilité en double valeur, CHF et KG CO2, en établissant un facteur d'équivalence entre des comptes financiers, ou des articles du stock, et des KG de CO2. Des valeurs d'impact CO2 sont disponibles mais ne sont pas utilisables directement dans un tel outil (trop spécifique, complexe ou non applicable à la Suisse). Le but du projet est de créer une base de données de valeurs moyennes d'impact CO2 pour les différentes catégories les plus habituelles entrant dans un plan comptable suisse.

Research team within HES-SO: Dozot Grégory , Rappo Daniel , Citherlet Stéphane , Lasvaux Sébastien , Lecorney Stéphane , Taylor James , Favre-Lamarine Jonathan , Frossard Mija

Partenaires académiques: MEI; IGT; Rappo Daniel, MEI

Durée du projet: 01.03.2022 - 31.08.2022

Montant global du projet: 14'524 CHF

Statut: Completed

2024

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

Scientific paper ArODES

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

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

Link to the publication

Summary:

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.

Environmental savings from concrete reuse :

Scientific paper ArODES

examining the limitations and optimal practices for cutting thresholds of concrete building components for reuse

Shuyan Xiong, Mija Frossard, Sébastien Lasvaux, Edwin Zea Escamilla, Guillaume Habert

Environmental Research: Infrastructure and Sustainability, 2024, 4, 3, 035016

Link to the publication

Summary:

Concrete, a widely used construction material, presents both opportunities and challenges for promoting environmentally responsible practices. This research focuses on the concept of concrete reuse as a sustainable strategy, examining the limitations of cutting dimensions. To investigate the greenhouse gas (GHG) emissions associated with preparing concrete for reuse, a mathematical model was developed considering several factors, such as transportation emissions, energy used in cutting, and the effects of varying cutting performance and energy sources. By incorporating real-life data and connecting with industrial practices, this study establishes a screening standard to determine the minimum cutting size for concrete reuse. The results indicate that the ratio of transportation distances for the reuse case versus the new production of concrete case has an influence on the minimum cutting size for concrete reuse. Moreover, the cutting size itself significantly impacts the overall GHG emissions of the reuse strategy. We offer practical insights for industry stakeholders to optimize concrete reuse practices and effectively reduce GHG emissions. As further research explores cost-effectiveness and on-site case studies, the potential for large-scale implementation of concrete reuse has become increasingly promising. Thus, concrete reuse has emerged as a viable and effective approach to sustainable construction, provided that the minimum cutting dimensions are carefully considered.

2023

Reuse practices in building construction :

Conference ArODES

proposition of a life cycle assessment methodology and application to a case study in Switzerland

Mija Frossard, Sébastien Lasvaux, Florence Petetin, L. Gross

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

Link to the conference

Summary:

This paper presents a life cycle assessment (LCA) methodology for evaluating the environmental impacts of reuse in building projects and apply it to a case study in Switzerland with 11% of reused components in its total mass. The results show that the life cycle GHG emissions on the construction domain that includes modules A1 to A4, B4, and C1-C4, are 487 kg CO2-eq./m2. In the other hand, the indirect effect of reuse lead to avoided GHG emissions of 76 kg CO2-eq./m2. At the level of a product's supply chain, the analysis demonstrates a significant reduction in the embodied impacts of the reused components compared to newly manufactured ones. The potential benefits from avoided manufacturing and waste management depend on the type of material that is reused.

Economic and environmental benefits of decentralized multi-energy systems for energy communities

Conference ArODES

Xavier Jobard, Massimiliano Capezzali, Neha Dimri, Alexis Duret, Marten Fesefeldt, Mija Frossard, Vincent Jacquot, Sébastien Lasvaux

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

Link to the conference

Summary:

In the context of growing interest in decentralised multi energy systems, this work aims at quantifying the benefit of optimized energy concepts for energy communities at the neighbourhood scale compared to individually optimized solution. To tackle this question a multi-objective optimization framework was developed and applied to a case study of 6 buildings consisting of 85% of residential dwellings and 15% to retail shop and food stores. Grouped buildings have decreased costs and greenhouse gases emissions (GHGE) respectively by 18% and 12% in the cost optimum compared to individual buildings. In the environmental optimum, costs have decreased by 11%, while GHGE remains in the same range. This decrease is at both optimum driven by electricity prices favourable to large consumers since exchanges on the electrical microgrid for this neighbourhood is very small. Optimal decrease of GHGE is obtained with greater use of HPs and smaller natural gas consumption. This work illustrates the interest of multi-objective approaches to identify optimal energy solutions for groups of buildings.

Life cycle assessment of the new solar thermal power plant SolarCAD II connected to a district heating network in Geneva, Switzerland

Conference ArODES

J. Solano, Mija Frossard, Sébastien Lasvaux, Alexis Duret

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

Link to the conference

Summary:

This paper presents a life cycle assessment (LCA) of the solar heat injected in a District Heating Network (DHN) by a new solar thermal power plant in Geneva. An environmental Life Cycle Assessment (LCA) is conducted according to ISO 14040, ISO 14044 and SN EN 15804+A2:2019. The scope of the study includes the complete life cycle of the solar power plant heat generation system. The baseline GHG emissions results show that the solar heat injected is responsible of about 15 to 18 gCO2-eq per kWh depending on whether we account for the environmental impacts of the steel gratings or not. This value is mostly determined by the manufacturing and use stages. Different sensitivity analyses are then performed in order to test the robustness of the main influential parameters (e.g., lifetime, efficiency, electricity mix) and better quantify the variability of the GHG emissions. Finally, this LCA study of a solar thermal plant connected to a Swiss DHN provides a first value of the solar heat in comparison with other heat production routes for DHN already provided in LCA databases such as the Swiss KBOB 2009/1:2022 platform for LCA in the construction sector.

Achievements

PEOPLE@HES-SO Directory and Skills inventory

Frossard Mija

Chargé de Ra&D HES

Chargé de Ra&D HES

PEOPLE@HES-SO
Directory and Skills inventory