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Rey Joan Frédéric

Collaborateur scientifique HES - Doctorant

Hauptkompetenzen

Collaborateur scientifique HES - Doctorant

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

Institut
Transform - Institut d'architecture : patrimoine, construction et usagers

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Laufend

Horizon H2020 RadoNorm - Towards effective radiation protection based on improved scientific evidence and social considerations - focus on radon and NORM

Rolle: Mitarbeiter

Financement: EU

Description du projet :

RadoNorm is designed to initiate and perform research and technical development in support of European Union Member
States, Associated Countries and the European Commission in their efforts to implement the European radiation protection
Basic Safety Standards. The proposed multidisciplinary and inclusive research project will target all relevant steps of the
radiation risk management cycle for radon and NORM exposure situations. RadoNorm aims to reduce scientific, technical
and societal uncertainties by (i) initiating and performing research and technical developments, (ii) integrating education and
training in all research and development activities, (iii) and disseminating the project achievements through targeted actions
to the public, stakeholders and regulators.
This will strengthen the scientific and technical basis for all key steps of the radiation risk management cycle for radon and
NORM. The inclusive character of RadoNorm is given at different levels, by (i) targeting research and development on all
steps of the management cycle, (ii) combining biomedical, and ecological research with mitigation development and social
science research, (iii) integration of researchers from national radiation protection institutions, research centres, universities,
and SME, (iv) incorporation of E&T activities in all undertakings, and (v) linking dissemination efforts directly to knowledge
achievements and new recommendations.
Steps addressed are the (a)characterization of radon and NORM exposures, (b)improving dosimetry, (c)assessing effects
and risks for humans and the environment, (d)refining mitigation technologies, (e)raising the understanding for societal
aspects, and (f)disseminating achievements. Further, an ambitious pan European E&T programme, will contribute to
competence building and sustainability of the project findings.
The project includes 56 partners from 22 EU member states and associated countries and collaboration with groups in the
US and Canada.

Forschungsteam innerhalb von HES-SO: Goyette Pernot Joëlle , Rey Joan Frédéric

Durée du projet: 01.09.2020 - 31.08.2025

Url des Projektstandortes: https://cordis.europa.eu/project/id/900009/fr

Statut: Laufend

Abgeschlossen

MACADAM - MitigAtion of ClimAte change by Design, Adaptation and Monitoring

Rolle: Mitarbeiter

Financement: HES-SO

Description du projet :

La finalité du projet consiste à contribuer à l'enrichissement des connaissances objectives sur les déterminants du microclimat urbain, afin que les collectivités, urbanistes, aménagistes, architectes du paysage puissent mettre en oeuvre des mesures qui conditionnent positivement le bien-être des usagers de la ville, à partir de connaissances solides et de références appropriées. La contribution de la nature est un élément fort de ces stratégies et ne sera efficace que si des conditions propices à son épanouissement sont rencontrées.

L'environnement urbain influence le bien-être physique, social et mental des habitants. En Suisse comme ailleurs, les principaux centres urbains sont soumis à une forte pression de densification aussi bien pour des raisons économiques (attraits des centres, concentration des activités) qu'en lien avec la loi sur l'aménagement du territoire (LAT).

Les perspectives climatiques montrent que les évolutions seront exacerbées dans l'environnement urbain. Les arbres urbains sur lesquels les politiques misent pour tempérer le climat sont déjà fortement impactés. Les fortes contraintes à venir doivent être comprises et anticipées dès maintenant, au vu de la durée de vie des aménagements et plantations.

Les mesures obtenues sur le terrain avec le microclimatmètre développé par hepia dans plusieurs grandes villes suisses ont permis de mettre en évidence des situations que l'état des connaissance ou de modélisation ne sont pas en mesure d'expliquer. Par exemple:

a) Pourquoi l'arbre ne contribue-t-il pas toujours au rafraîchissement de la ville?

b) Pourquoi les plans d'eau n'apportent-ils que rarement la fraîcheur escomptée?

c) Comment s'assurer du bon usage des surfaces urbaines comme composante de la régulation climatique?

d) Quelle contribution climatique attendre de la nature en ville?

Afin de cibler au mieux les politiques climatiques et investissements consécutifs, ainsi que pour obtenir les services écosystémiques escomptés, il est indispensable de bien comprendre les mécanismes qui conditionnent le microclimat sous nos latitudes dans le contexte d'urbanisation en Suisse, et en particulier de mettre en évidence les conditions qui limiteront le développement des arbres en ville.

Pour répondre à cette demande, le projet MACADAM prévoit de:

a) Réaliser des mesures microclimatiques détaillées.

b) Documenter et analyser les contributions de chaque élément qui définit les espaces identifiés, à savoir: le végétal, l'eau, la matérialité et leur organisation spatiale.

c) Etablir des indicateurs utiles pour apprécier le contexte microclimatique des personnes et du végétal.

d) Rédiger un guide-référentiel qui illustre les études de cas et apporte des explications concises et factuelles sur le fonctionnement des éléments dans leur contexte urbain.

Forschungsteam innerhalb von HES-SO: Camponovo Reto , Goyette Pernot Joëlle , Boivin Pascal , Rey Joan Frédéric

Partenaires académiques: Galinelli Peter, HEPIA; Guillot Victor, HEPIA; Fournier Marie, HEPIA; Crémel Laurence, HEPIA; Rey Joan Frédéric, HEIA-FR

Durée du projet: 01.04.2018 - 31.07.2020

Montant global du projet: 175'000 CHF

Statut: Abgeschlossen

Interreg France-Suisse JURAD-BAT - Améliorer la gestion du risque radon dans les bâtiments de l'Arc jurassien: une plateforme transfrontalière au service des usagers et professionnels concernés.

Rolle: Mitarbeiter

Description du projet :

Ce projet a pour objectif de développer une plateforme transfrontalière pour favoriser la mise en commun, le partage d’expériences et de compétences et la formation des professionnels en matière de gestion du risque radon. Ce traitement du risque s’intégrera plus globalement dans une démarche de santé publique au sein des bâtiments de l’arc jurassien en considérant la qualité générale de l’air intérieur et la problématique de l’efficacité énergétique.

https://www.smartlivinglab.ch/fr/projects/jurad-bat/

Forschungsteam innerhalb von HES-SO: Goyette Pernot Joëlle , Rey Joan Frédéric , Perrelet Théo , De Potter Longchamp Céline , Cesari Matias

Partenaires académiques: Gschwind Régine, Université de Franche-Comté

Partenaires professionnels: Gandolla Mauro, ECONS SA; Renaud Pierre, Planair SA; Bujard Martial, EHE SA

Durée du projet: - 10.04.2020

Statut: Abgeschlossen

2024

Evaluation of the impact of ventilation system daily operation on air quality, comfort and well-being in primary schools

Wissenschaftlicher Artikel

Rey Joan Frédéric, Cesari Matias, Christophe Brunner, Yan Muller, Claude-Alain Roulet, Goyette Pernot Joëlle

Journal of Physics: Conference Series, 2024 , vol. 2600, no 102005

Link zur Publikation

Zusammenfassung:

The Scol’air-FR project is issued from the need to establish an inventory of indoor air quality conditions in primary schools of the canton of Fribourg, Switzerland. In Fribourg, the official trend is to promote mechanical ventilation systems in schools to ensure a good air quality. A properly designed, built, commissioned, and operated mechanical ventilation system should be able to deliver the anticipated flow rate, regardless of who uses it - the only person involved being the person responsible for ventilation system operation. In some cases, however, the expected objectives are not achieved. This similar observation applies to natural ventilation. A good ventilation concept, properly implemented and operated, should also achieve the same
objective if the outdoor air quality is good. The aim of this article is to identify differences, in terms of indoor air quality and well-being, between naturally and mechanically ventilated schools. Moreover, we expect to identify if trends are attributable to the operation of ventilation systems or to occupant behaviours. We observed lower carbonic gas levels in building equipped with mechanical ventilation systems. This finding can be extended to VOCs and relative humidity. We also identified different and recurrent issues among the different mechanical ventilation systems. Our results highlight issues measured in buildings equipped by mechanical ventilation systems are mostly related to the balance of the system, while in natural ventilation systems, IAQ related issues are mainly due to the present context and its influences on occupants’behaviour.

Autodigit-RAD: Towards an automation of the radon’s concentration dataflow in a new and innovative building

Wissenschaftlicher Artikel

Rey Joan Frédéric, Cesari Matias, Schoenenweid Marion, Montet Frédéric, Mauro Gandolla, Leevan Bonvin, Bourquin Vincent, Claude-Alain Jaccot, Justine Roman, Sebastian Duque Mahecha, Sergi Aguacil Moreno, Hennebert Jean, Goyette Pernot Joëlle

Journal of Physics: Conference Series, 2024 , vol. 2600, no 102008

Link zur Publikation

Zusammenfassung:

Radon is a noble, natural, and radioactive gas coming mainly from the ground which might accumulate indoors and lead each year to 200-300 deaths from lung cancer in Switzerland. A brand new and innovative living lab will be built as of 2023 in Fribourg (Switzerland) which will allow to tackle the built environment and the relationship with its occupants. Among a large panel of environmental parameters, radon gas will be continuously monitored under and around the building as well as in the building envelope. This paper aims to present the overall process of the radon dataflow: 1) design of the sensor probes, 2) implementation of the radon sensor probes in the ground and 3) go-live with the data sharing platform with the building users. Such an infrastructure will bring the opportunity to researchers to lead new and innovative radon-related research.

Performance evaluation of radon active sensors and passive dosimeters at low and high radon concentrations

Wissenschaftlicher Artikel

Rey Joan Frédéric, Nicolas Meisser, Dusan Licina, Goyette Pernot Joëlle

Building and Environment, 2024 , vol. 250, no 111154

Link zur Publikation

Zusammenfassung:

Radon is a naturally occurring radioactive gas that has the potential to accumulate in buildings and over time, causes lung cancer in humans. Present methods for radon measurements are disparate, which pose challenges to benchmark radon concentrations and to accurately assess the population's received dose. This paper presents a comprehensive performance evaluation of radon dosimeters and three grades of active radon sensors: consumer-, medium- and research-grade. The measurements were performed at relatively low (300 Bq/m3) and high (2′000–3′000 Bq/m3) radon levels. Tests were conducted in an atomic shelter, with stable temperature and humidity conditions. The active sensors differed in absolute accuracy and dynamic performance (time-dependent correlations) according to their grade. Research-grade sensors performed marginally better than medium-grade sensors, and significantly better than consumer-grade sensors. Relative to the reference, the error (percentage difference between the reference and the sensors) was below 5 % for research- and medium-grade sensors, and nearly 10 % for consumer-grade sensors at high radon levels. Performance of sensors diminished at low radon levels, except for research-grade sensors. Passive dosimeters generally performed better at high radon levels than at low ones. Their longer exposure time was associated with increased measurement reliability. These results highlight the need for understanding the purpose of measurements in order to select an adequate radon detector, and ultimately, reduce measurement and interpretation errors. This study raises awareness among researchers, radon professionals and the general public regarding the performances of different active radon sensors and passive dosimeters. It also sheds light on their respective scope of application.

2022

Long-term impacts of weather conditions on indoor radon concentration measurements in Switzerland

Wissenschaftlicher Artikel ArODES

Joan Frédéric Rey, Stéphane Goyette, Mauro Gandolla, Martha Palacios, Fabio Barazza, Joëlle Goyette Pernot

Atmosphere, 2022, vol. 13, no. 1, article no. 92

Link zur Publikation

Zusammenfassung:

Radon is a natural and radioactive gas that can accumulate in indoor environments. Indoor radon concentration (IRC) is influenced, among other factors, by meteorology, which is the subject of this paper. Weather parameters impact indoor radon levels and have already been investigated, but rarely in Switzerland. Moreover, there is a strong need for a better understanding of the radon behaviour inside buildings in Switzerland for public health concerns as Switzerland is a radon prone area. Based on long-term, continuous, and hourly radon measurements, radon distributions classified according to different weather event definitions were investigated and then compared at three different study sites in Western Switzerland. Outdoor temperature influences the most indoor radon, and it is globally anti-correlated. Wind influences indoor radon, but it strongly depends on intensity, direction, and building characteristics. Precipitation influences periodically indoor radon levels relatively to their intensity. Atmospheric pressure and relative humidity do not seem to be huge determinants on IRC. Our results are in line with previous findings and provide a vivid example in Western Switzerland. This paper underlines the different influence complexities of radon, and the need to communicate about it within the broader public and with construction professionals, to raise awareness.

Long-Term Impacts of Weather Conditions on Indoor Radon Concentration Measurements in Switzerland

Wissenschaftlicher Artikel

Rey Joan Frédéric, Goyette Stéphane, Mauro Gandolla, Martha Palacios, Fabio Barazza, Goyette Pernot Joëlle

Atmosphere, 2022 , vol. 13(1)

Link zur Publikation

Zusammenfassung:

2021

Influence of some specific meteorological events on indoor radon dynamic in western Switzerland

Wissenschaftlicher Artikel

Rey Joan Frédéric, Goyette Stéphane, Martha Palacios, Fabio Barazza, Mauro Gandolla, Goyette Pernot Joëlle

Journal of Physics: Conference Series, 2021 , vol. 2042, no 012138

Link zur Publikation

Zusammenfassung:

Radon is a natural radioactive gas that may cumulate in indoor environments. The impacts of weather events on indoor radon concentration had been explored in different places around the world but only marginally in Switzerland. Using basic statistical analysis, this study investigates different meteorological parameters' influence on indoor radon concentrations and shows that outdoor air temperature is the most influential beyond others. Finally, this paper highlights the importance of radon dynamic in buildings, a topic often overlooked by construction professionals and the broader public in Switzerland.

2020

Shifting velocity of temperature extremes under climate change

Wissenschaftlicher Artikel

Rey Joan Frédéric, Guillaume Rohat, Goyette Stéphane, Marjorie Perroud, Jérôme Kasparian

Environmental Research Letters, 2020

Link zur Publikation

Zusammenfassung:

Rapid changes in climatic conditions threaten both socioeconomic and ecological systems, as these might not be able to adapt or to migrate at the same pace as that of global warming. In particular, an increase of weather and climate extremes can lead to increased stress on human and natural systems, and a tendency for serious adverse effects. We rely on the EURO-CORDEX simulations and focus on the the screen-level daily mean temperature (T2m). We compare the shifting velocities of the cold and hot extremes with these of the associated central trends, i.e. the arithmetical mean or median. We define the extremes relative to the T2m distribution as it evolves with time over the period of 1951–2100. We find that temperature extremes shift at a similar velocity compared to that of the central trends. Accordingly, the T2m probability distribution shifts mostly as a whole, as the tails of the distribution increase together with the central trends. Exceptions occur however in specific regions and for the clustering of warm days, which shifts slower than all other extremes investigated in this study.

Human an Building - envelop interaction in open area - Which constructive choises to improve summery comfort?

Wissenschaftlicher Artikel

Rey Joan Frédéric, Victor Guillot, Peter Gallinelli, Reto Camponovo

Erneuern! Sanierungstrategien für den Gebäudepark, 2020

Link zur Publikation

Zusammenfassung:

Brenet : Das Status-Seminar wird durch den Verein brenet organisiert. brenet versteht sich als Plattform, an die sich Industrie, Gewerbe, Planende wie auch die Behörde zu den Themen Nachhaltiges Bauen, Quartierentwicklung, Gebäudetechnik und Erneuerbare Energien wenden können.
Im Nationalen Kompetenznetzwerk im Bereich Gebäudetechnik und Erneuerbare Energien (brenet) erforschen seit 2001 Institute von Fachhochschulen, Empa (ETH-Annexanstalt) und unabhängigen privaten Organisationen institutsübergreifend Lösungen für eine nachhaltige Zukunft.
Durch die verschiedenen Kompetenzen der brenet-Mitgliederinstitute ergeben sich dank der Synergien innovative Lösungen für Forschungs- und Entwicklungsvorhaben aber auch für neue Dienstleistungen. brenet-Projekte haben den klaren Schwerpunkt auf der praxisorientierten und wirtschaftlichen Umsetzung. Mit der klaren Mission, die Zukunft aktiv zu gestalten und an Lösungen mit einem langen, nachhaltigen Zeithorizont mitzuwirken.

2023

Autodigit-RAD :

Konferenz ArODES

towards an automation of the radon’s concentration dataflow in a new and innovative building

Joan Frédéric Rey, Matias Cesari, Frédéric Montet, M. Gandolla, Leewan Bonvin, Vincent Bourquin, C. L. Jacot, Justine Roman, Sebastian Duque Mahecha, Sergi Aguacil Moreno, Jean Hennebert, Joëlle Goyette Pernot

Journal of Physics: Conference Series ; Proceedings of cisbat 2023, the built environment in transititon, Hybrid International Scientific Conference, 13-15 September 2023, Lausanne, Switzerland

Link zur Konferenz

Zusammenfassung:

Evaluation of the impact of ventilation system daily operation on air quality, comfort and well-being in primary schools

Konferenz ArODES

Joan Frédéric Rey, Matias Cesari, Christophe Brunner, Y. Muller, Claude-Alain Roulet, Joëlle Goyette Pernot

Journal of Physics: Conference Series ; Proceedings of cisbat 2023, the built environment in transititon, Hybrid International Scientific Conference, 13-15 September 2023, Lausanne, Switzerland

Link zur Konferenz

Zusammenfassung:

The Scol'air-FR project is issued from the need to establish an inventory of indoor air quality conditions in primary schools of the canton of Fribourg, Switzerland. In Fribourg, the official trend is to promote mechanical ventilation systems in schools to ensure a good air quality. A properly designed, built, commissioned, and operated mechanical ventilation system should be able to deliver the anticipated flow rate, regardless of who uses it - the only person involved being the person responsible for ventilation system operation. In some cases, however, the expected objectives are not achieved. This similar observation applies to natural ventilation. A good ventilation concept, properly implemented and operated, should also achieve the same objective if the outdoor air quality is good. The aim of this article is to identify differences, in terms of indoor air quality and well-being, between naturally and mechanically ventilated schools. Moreover, we expect to identify if trends are attributable to the operation of ventilation systems or to occupant behaviours. We observed lower carbonic gas levels in building equipped with mechanical ventilation systems. This finding can be extended to VOCs and relative humidity. We also identified different and recurrent issues among the different mechanical ventilation systems. Our results highlight issues measured in buildings equipped by mechanical ventilation systems are mostly related to the balance of the system, while in natural ventilation systems, IAQ related issues are mainly due to the present context and its influences on occupants' behaviour.

Evaluation of the impact of ventilation system daily operation on air quality, comfort and well-being in primary schools

Konferenz

Goyette Pernot Joëlle, Rey Joan Frédéric, Cesari Matias, Claude-Alain Roulet, Christophe Brunner, Yan Muller

CISBAT 2023, 13.09.2023 - 15.09.2023, Lausanne

Link zur Konferenz

Zusammenfassung:

Indoor air quality (IAQ) in educational facilities is a major concern for children’s health and development and, consequently, for the authorities in charge of the school buildings. For instance, it has been shown that children’s cognitive performances are affected at high levels of CO2 in classrooms. The Scol’air-FR project is issued from the need to establish an inventory of indoor air quality conditions in primary schools of the canton of Fribourg. It is the first project undertaken by the recently formed association ORTQAI (www.ortqai.ch), which aims to aggregate and spread IAQ-related knowledge.
The main research question addressed by the Scol’ar-FR project is:
Can IAQ and well-being differences be identified among naturally and mechanically ventilated schools? Moreover, are these trends attributable to the operation of the ventilation systems or to the occupant’s behaviors?
Over an 18-month period, three different measurement campaigns were carried out in three different seasons: Autumn 2021, Winter 2022, Summer 2022. A second Winter campaign is planned between January and March 2023. In total, 24 schools were each monitored over one full week periods across the canton. The selected schools were chosen to be representative of the linguistic context, the ventilation system’s type, and area’s type (rural, suburban, urban). The sample comprises 13 naturally ventilated schools (passive ventilation), and 11 with mechanical ventilation systems (mostly double flux systems. In each school, two classrooms and one outdoor nearby location were systematically investigated with CO2, particulate matter, VOCs, radon, air temperature and relative humidity. Qualitative surveys were addressed to teachers to assess users’ comfort and activities in their classrooms.
Autumn 2021 campaign’s results are presented below. Results for Winter 2022 and Summer 2022 campaigns will also be available for the CISBAT conference. CO2 averaged mean and maximum levels during class hours were respectively 725 ppm and 1202 ppm for mechanically ventilated classroom and 840 ppm and 1796 ppm for naturally ventilated classroom. With regard to total VOCs, a large difference appeared between mechanically and naturally ventilated classrooms with respectively a 75-percentile located at 150 μg/m3 and 350 μg/m3 equivalent in toluene. These findings are similar for
PM and radon, which depicts a lower IAQ in naturally ventilated classrooms. As expected, all monitored pollutants are recorded with lower concentrations at the outdoor measurement points.
These preliminary results reveal an IAQ difference between naturally and mechanically ventilated classrooms, emphasizing disparities within the canton. Besides, Winter 2021 campaign was carried out while COVID-19 protection measures were in force, which indirectly implies a better IAQ than before the pandemic. Results also support a strong need to increase knowledge on ventilation systems’ real operation modes in schools. Four schools equipped with mechanical ventilation systems will be further analyzed to clearly identify their deficiencies and to optimize their operation. On the long-term, these results will be useful to address a list of recommendations for both ventilation system installers, maintenance staff and building owners.

2021

Does aerosols affect radon active measurements ?

Konferenz

Intercomparing high-grade and low cost radon sensors under typical indoor aerosol

Rey Joan Frédéric

ROOMS 2021, 13.10.2021 - 15.10.2021, Fribourg, Suisse

Link zur Konferenz

Influence of some specific meteorological events on indoor radon dynamic in western Switzerland

Konferenz

Rey Joan Frédéric, Goyette Stéphane, Mauro Gandolla, Fabio Barazza, Martha Palacios, Goyette Pernot Joëlle

CISBAT 2021, 08.09.2021 - 10.09.2021, Lausanne

Link zur Konferenz

Errungenschaften

PEOPLE@HES-SO
Verzeichnis der Mitarbeitenden und Kompetenzen

Rey Joan Frédéric

Collaborateur scientifique HES - Doctorant

Hauptkompetenzen

Data Analysis

Radon

Collaborateur scientifique HES - Doctorant

PEOPLE@HES-SO Verzeichnis der Mitarbeitenden und Kompetenzen

Rey Joan Frédéric

Collaborateur scientifique HES - Doctorant

Hauptkompetenzen

Data Analysis

Radon

Collaborateur scientifique HES - Doctorant

PEOPLE@HES-SO
Verzeichnis der Mitarbeitenden und Kompetenzen