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Cesari Matias

Collaborateur scientifique HES

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Collaborateur scientifique HES

Telefon-Nummer: +41 26 429 66 23

Büro: BFA_22_b

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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Abgeschlossen

RAME - Radon mitigation efficiency - Vérifier l’efficacité à long terme des mesures de remédiation au radon mises en œuvre dans les habitations.

Rolle: Mitarbeiter

Requérant(e)s: Luca Pampuri, SUPSI

Financement: OFSP

Description du projet :

Il s’agit d’un projet de recherche financé par l’Office fédéral de la santé publique (OFSP). Il vise à vérifier l’efficacité à long terme des mesures de remédiation au radon mises en œuvre dans les habitations.

Le projet est géré au niveau national par le centre de compétence radon de la SUPSI avec la collaboration de partenaires nationaux et régionaux compétents, tels que les deux autres centres de compétence radon de Fribourg et de Muttenz, l’Office fédéral de la santé publique et le bureau d’étude ECONS SA Ingénierie de Bioggio au Tessin.

Au cours des dernières décennies, de nombreuses campagnes de mesures du radon ont été réalisées sur l’ensemble du territoire national, dans le but de surveiller la concentration du gaz dans les habitations. Dans de nombreux cas, des interventions ont été menées pour réduire les valeurs enregistrées à l'intérieur des bâtiments et les ramener à des valeurs inférieures au niveau de référence réglementé par l’Ordonnance sur la Radioprotection (ORaP). Néanmoins toutes ces interventions n'ont pas toujours été signalées par les propriétaires et, par conséquent, n’ont pas été systématiquement enregistrées dans la base de données radon de la confédération.

L’un des objectifs de cette étude est de recenser dans une seule base de données, toutes les informations disponibles sur les interventions effectuées en Suisse pour remédier au radon. Pour cela il faut estimer le nombre de bâtiments remédiés sur le territoire national puis évaluer l’efficacité, sur la durée, des installations mises en œuvre pour enfin être en mesure d’élaborer des lignes directrices d’utilité publique relatives aux techniques de remédiation possibles et à leur efficiacité.

Le but est également ensuite de transcrire ces « retours d’expérience » dans la formation des professionnels du radon mais plus largement aussi des professionnels de la construction.

Forschungsteam innerhalb von HES-SO: Goyette Pernot Joëlle , Mertenat Florence , Cesari Matias

Partenaires académiques: Luca Pampuri, SUPSI; Fregnan Franco, FNWZ

Partenaires professionnels: Gandolla Mauro, ECONS SA

Durée du projet: 01.03.2019 - 31.12.2020

Montant global du projet: 145'085 CHF

Url des Projektstandortes: https://radonmitigation.ch/

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

2023

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.

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:

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.

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.

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Cesari Matias

Collaborateur scientifique HES

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Architecture

Radon

Qualité de l'air intérieur

Construction

Construction en terre

Collaborateur scientifique HES