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Robadey Jacques

Professeur HES ordinaire

Main skills

Architecture des réseaux de télécom

Professeur HES ordinaire

Desktop: HEIA_C10.11

Haute école d'ingénierie et d'architecture de Fribourg
Boulevard de Pérolles 80, 1700 Fribourg, CH

BA HES-SO en Architecture - Haute école d'ingénierie et d'architecture de Fribourg

Téléinformatique
Technique des télécommunications
Nouvelles architectures de réseaux
Conception de réseaux

Ongoing

Ionic Liquid PCM for smart building applications

Role: Collaborator

Financement: Smart Living Lab

Description du projet :

Smart buildings and the energy strategy 2050 are at the origin of an important demand for compact and demand-oriented thermal storage. One solution to meet these requirements is the use of new PCMs with on-demand activation and intelligent control of the heat&cold storage, charge and discharge processes. This means that new PCM must be developed together with a measurement system of their capacity and storage level.
In this project, we prepare novel sustainable phase change materials (PCM) based on ionic liquids (IL) from natural & renewable sources. These IL-PCMs are tested to the stage of an initial demonstrator and are designed to store & manage heat in smart buildings.

Research team within HES-SO: Robadey Jacques

Durée du projet: 01.07.2019 - 30.04.2021

Montant global du projet: 90'850 CHF

Statut: Ongoing

Réseau LORA pour les villes de Fribourg et Bulle

AGP

Role: Main Applicant

Financement: Ville de Fribourg; Groupe e; FR - EIA - Institut iSIS; Morphean SA; Ville de Bulle; NPR; Ville de Fribourg; FRANIC SA; Gruyère Energie; WiFX; FR - EIA - Institut iSIS

Description du projet : Les services de mobilité ont besoin d'une visibilité en direct du trafic routier et de ces effets néfastes au niveau des pollutions atmosphérique et sonore.

Research team within HES-SO: Montet Frédéric , Robatel Vincent , Torche Pamela , Ayer Serge , Jourdan Matthieu , Robadey Jacques , Helfer Florian , Rime Simon , Huber Jan , Bapst Nicolas , Rapin Quentin , Camuglia Lucien , Vuilleumier Sylvain , Baeriswyl Ivan , Siow Ryan

Durée du projet: 01.05.2019 - 31.12.2025

Montant global du projet: 245'300 CHF

Statut: Ongoing

PCM-based Solutions for building heating & Cooling INNOSUISSE N° 32485.1 IP-EE

Role: Main Applicant

Financement: Innosuisse

Description du projet :

The real estate heating/cooling consuming 34% of the Swiss energy must be improved. The main issue is the refurbishment of old buildings. We propose to replace their heating with low-cost PCM heat exchangers that store heat and cold with available renewable energy and restore it when required.

Research team within HES-SO: Robadey Jacques

Durée du projet: 01.01.2019 - 31.08.2021

Montant global du projet: 553'784 CHF

Statut: Ongoing

Completed

Symposium Energieinnovation, TU Graz, 2018

AGP

Role: Main Applicant

Financement: FR - EIA - Institut ENERGY

Description du projet : Ce projet correspond au travail nécessaire pour l'écriture de la publication / proceedings de la conférence Energieinnovation à Graz, Autriche en 2018 ainsi que pour la participation à cette conférence et la mise en valeur ultérieure des résultats obtenus par le projet « Smart PCM Walls ». La mise en valeur de la publication peut être accompagné d'achat de matériel pour démontrer, visualiser les résultats pour des présentations des activités réalisées au sein de l'institut Energie avec des buts promotionnels.

Research team within HES-SO: Gutknecht Esther , Selçukoglu Eyüp , Robadey Jacques , Bourrier Hervé

Durée du projet: 01.01.2018 - 31.12.2018

Montant global du projet: 3'000 CHF

Statut: Completed

2022

THERMAL STORAGE AND HEAT DISCHARGE EFFICIENCY OF AN AIR-PCM-WATER HEAT EXCHANGER

Scientific paper

Robadey Jacques, Ruben Richard

Proceedings of EnInnov2022, 17. Symposium Energieinnovation, 16-18 Februar 2022, Graz, Austria, 2022 , pp. 1-2

Link to the publication

Summary:

Reducing the use of fossil fuels is one of the biggest challenges of the current energy transition. Since thermal needs correspond to up to 80% of the building energy consumption, using solar energy to heat buildings could provide key improvements in energy efficiency. However, while PhotoVoltaic (PV) panels can provide a high average power, their power is too low during high thermal demands, which makes energy storage essential. We propose to use Phase Change Materials (PCM) [1, 2, 3, 4] to store thermal energy during periods of high solar power and reuse it when the renewable power becomes insufficient. As heat pumps have a high Coefficient of Performances (COP) for low temperature heating, the use of PCMs with a low fusion temperature is preferred. In that respect, we built new air-water heat exchangers containing PCM layers between both circuits, with fusion temperature between 23 and 25°C. In this document we report the measured storage capacity as well as the charge and discharge powers of such a PCM heat exchanger with dimensions of 0.8 x 0.5 x 0.25m.

2021

A LoRa Network for traffic monitoring in the cities of Fribourg and Bulle

Scientific paper

Eddy Mariéthoz, Robadey Jacques

FTAL 2021 Proceedings, 2021 , pp. 1-5

Link to the publication

Summary:

The document describes a smart city project based on a LoRa communication network to
monitor road traffic, noise and air quality in the cities of Fribourg and Bulle. The network
planning and deployment and the first measurement results are presented.

Thermal energy autonomy study for a reference house equipped with PV panels, a heat pump and PCM storage elements

Scientific paper

Robadey Jacques

Journal of Physics: Conference Series, 2021 , vol. 2042, no 012147, pp. 1-6

Link to the publication

Summary:

Despite their rapid growth, renewable energies cannot provide energy on demand, which is an essential requirement for heating buildings. To this end, we developed heat exchangers with Phase Change Materials that allow the on-demand charge, storage and discharge of thermal energy. In this paper we evaluate the storage capacities needed to achieve thermal energy autonomy. An existing reference house, meteorological data from MeteoSwiss and solar radiation intensity were used to evaluate the thermal needs and the solar power production for the year 2019. To heat the building an air-water heat pump is preferably powered by solar energy. The calculations have been performed from October to March. Using 1200 litres of PCM, a
thermal autonomy of 100% was achieved for March and October. In February, November and December, 24 days could not reach a thermal autonomy. For the month of January that was studied in detail 15 days are self-sufficient. By increasing the PCM volume to 2’600 litres 5 more days become self-sufficient. To achieve total building heating autonomy, seasonal storage is necessary.

2020

Le film de recherche comme modalité de production d’un discours scientifique en anthropologie de la santé

Scientific paper

Robadey Jacques, Démolis Rachel

Anthropologie et santé, 2020 , no 21

Link to the publication

Summary:

Dans le cadre d’une recherche socio-anthropologique portant sur les usages médicamenteux des personnes âgées polymédiquées en Suisse, une anthropologue et une réalisatrice élaborent un film de recherche interrogeant le statut scientifique qu’il est possible d’attribuer aux films de recherche et engagent une réflexivité à deux voix sur les divers défis épistémologiques, techniques et déontologiques rencontrés. Cette démarche leur permet d’interroger l’apport d’une production filmique de recherche au champ anthropologique. La mise en présence des données audiovisuelles donne à voir le terrain dans toute son épaisseur, et permet également aux acteurs de l’étude de développer une nouvelle mise en récit, qui montre leur expertise. Elle est particulièrement significative pour l’analyse anthropologique dont la réflexion se façonne, lors de la réalisation de terrains, grâce à la mobilisation de l’intuition et de l’imagination ethnographique du/de la chercheur.e et ouvre l’échange entre pairs.

2018

Lower between-limb asymmetry during running on treadmill compared to overground in subjects with laterally pronounced knee osteoarthritis

Scientific paper ArODES

Jacques Robadey, Didier Staudenmann, Raphael Schween, Dominic Gehring, Albert Gollhofer, Wolfgang Taube

PLoS ONE,

Link to the publication

Summary:

Subjects with knees osteoarthritis (KOA) show gait asymmetries evidenced by lower knee flexion and shorter contact times for the affected leg. Interestingly, running on a treadmill compared to running overground is also associated with lower knee flexion and shorter contact times. Thus, it is of particular interest how gait patterns are influenced by the type of ground in subjects with KOA. The aim of the current study was therefore to measure the overground asymmetry of kinematic parameters in KOA subjects while running and to investigate wether this asymmetry is altered on a treadmill. Nine patients diagnosed with KOA underwent overground and treadmill running with 3D-motion analysis. The symmetry analysis was performed using Symmetry Angles for five selected gait parameters: contact and step time, heel-toe delay, maximal knee flexion during stance and vertical speed variance. For all parameters, the values were significantly lower for the affected compared to the non-affected leg (p≤0.023). Post-hoc analyses revealed significant differences between legs only overground and not on the treadmill. The asymmetry was lower on the treadmill, as indicated by significant Symmetry Angle reductions for contact time (p=0.033), knee flexion (p=0.001) and vertical speed variance (p=0.002). The symmetry increase on the treadmill was mainly due to changes of the non-affected leg towards the affected leg values leading to smaller steps and less impact load in general. The present results suggest therfore taht a) an assessement of symmetry may differ depending on the ground type (treadmill versus overground) and b) treadmill running may be more suitable for patients with KOA gait asymmetries.

2024

Simulation and measurements of a new PCM storage system using night cold air for daytime free cooling of buildings

Conference

Robadey Jacques, Lalou Moncef Justin, Reiss Hans

JITH 2024 - 20th Edition | Eco-design of building and city for climate resilience, 29.10.2024 - 31.10.2024, Paris

Summary:

A PCM cold storage battery has been built with 2 small PCM cells integrated in an air-flow heat-exchanger. The idea is to use it as a portable device that can be brought outside in summer night to store the cold and discharge inside on the following day. The prototype realization is described with its major issues in low power ventilation of the heat exchanger and efficient heat transfer between the air flow and the PCM with thermal conductivity < 0.2 W/(m K). A parallel and a serial setup of the two cells have been built and the charge, storage and discharge properties have been compared. Cooling powers of 87W and 160W were obtained with flows of 32m3/h and 60m3/h, respectively for a total storage potential between 15°C and 30°C of 176Wh. The thermal profile of the PCM battery has been investigated along the air-flow channel and the neighboring PCM zone for charge/discharge and storage processes and was compared with finite element simulations. A critical analysis of the measurement and simulation results is presented together with the usage perspectives of such batteries in residential building environments.

A cold storage PCM heat exchanger for daily summer free cooling with cold night air

Conference ArODES

Jacques Robadey, Sylvain Villeumier, Justin Lalou Moncef

Proceedings of 18. Symposium Energieinnovation (EnInnov) 2024, 14-16. Februar 2024, Graz, Austria

PEOPLE@HES-SO Directory and Skills inventory

Robadey Jacques

Professeur HES ordinaire

Main skills

Réseaux de capteurs

Architecture des réseaux de télécom

Energétique du bâtiment

Internet des objets

Smart City

Biomécanique du sport

Professeur HES ordinaire

PEOPLE@HES-SO
Directory and Skills inventory