Publication

Heat recovery potential from ventilated passive and active facades

Dolaana Khovalyg, Mohammad Rahiminejad
2022
Conference Papers

Résumé

A ventilated air-space behind external claddings can potentially affect the thermal performance of the entire building structure. In particular, in the Building Integrated Photovoltaic (BIPV) facades, ventilated cavities are typically present between the PV panels and the walls of the building. The airflow in the cavity can remove the generated heat behind the active external cladding, which could be eventually used as an additional source for heat recovery. In this study, the heat recovery from a ventilated air-space behind passive (wood) and active (BIPV) facades are investigated using transient simulations. The numerical model used in this study is validated against experimental measurements carried out in a building prototype located in the Smart Living Lab in Fribourg (Switzerland). The original façade is made of wooden cladding that is separated from the wall core incorporating a ventilated cavity. To study the impact of façade type on the results, the external cladding is virtually replaced with typical polycrystalline PV panels. The analyses are performed for representative days in the winter and summer of 2021 using recorded weather data on the test building. The results are examined in terms of the temperature distribution of the layers in the wall assembly, heat flux through the indoor space, airspeed in the cavity, and heat flow in the air gap. The potentials for heat recovery per day of interest are also calculated and compared. It was shown that the heat recovery from the cavity behind the BIPV façade could become equal to 5341 kWh on a representative summer day, which is considerably higher compared to the value obtained for a passive cladding. The results highlight the potential for harvesting heat from the ventilated air gaps behind passive and active facades. The outcome of this study highlights the need for the integrated vision for energy-savings at the building scale. CLIMA 2022 conference, 2022: CLIMA 2022 The 14th REHVA HVAC World Congress

Source officielle

https://infoscience.epfl.ch/entities/publication/c8ea614d-dc30-47b7-9da2-a9a04b9d3c58

Dolaana Khovalyg, Mohammad Rahiminejad
2022
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/c8ea614d-dc30-47b7-9da2-a9a04b9d3c58

Proximité ontologique

Génie énergétique

Solar power: Topics in solar power

Concepts associés (32)

Installation photovoltaïque intégrée au bâti

thumb|Habitations avec des panneaux solaires intégrés au bâti à Fribourg-en-Brisgau. Les installations photovoltaïques intégrées au bâti sont des installations photovoltaïques se substituant aux éléments de construction traditionnels des maisons et immeubles. La filière est souvent désignée par son acronyme anglais BIPV (). L’intégration du photovoltaïque au bâti apparait dans les années 1980 aux États-Unis, ces systèmes installés sur des bâtiments connectés au réseau ne sont pas montés en surimposition mais intégrés esthétiquement car le photovoltaïque arrive en ville et ne se limite plus au site isolé.

Échangeur de chaleur

Un échangeur de chaleur est un dispositif permettant de transférer de l'énergie thermique d'un fluide vers un autre sans les mélanger. Le flux thermique y traverse la surface d'échange qui sépare les fluides. L'intérêt du dispositif réside dans la séparation des deux circuits et dans l'absence d'autres échanges que la chaleur, qui maintient les caractéristiques physico-chimiques (pression, concentration en éléments chimiques...) de chaque fluide inchangées hormis leur température ou leur état.

Ventilative cooling

Ventilative cooling is the use of natural or mechanical ventilation to cool indoor spaces. The use of outside air reduces the cooling load and the energy consumption of these systems, while maintaining high quality indoor conditions; passive ventilative cooling may eliminate energy consumption. Ventilative cooling strategies are applied in a wide range of buildings and may even be critical to realize renovated or new high efficient buildings and zero-energy buildings (ZEBs).

Afficher plus

Publications associées (28)

Correlating long-term performance and aging behaviour of building integrated PV modules

Christophe Ballif, Alessandro Francesco Aldo Virtuani, Ebrar Özkalay

Because building-integrated photovoltaic (BIPV) modules are fully integrated into a building envelope, the back of the module can be exposed to little or no ventilation, resulting in increased operating temperatures. As the temperature increases, the perfo ...

Elsevier Science Sa2024

Advanced Manufacturing and Characterization of Building-Integrated Photovoltaic Modules

Alejandro Borja Block

Photovoltaic (PV) technology is necessary for global decarbonization. However, one of the challenges of the technology is that its land use may conflict with other space demands. Building-integrated photovoltaic (BIPV) is a solution to efficiently use the ...

EPFL2024

Network time series forecasting in photovoltaics power production

Jelena Simeunovic

Accurate forecasting of photovoltaic (PV) power production is crucial for the integration of more renewable energy sources into the power grid. PV power production is highly intermittent, due to the stochastic cloud behaviour and cloud dynamics. Previous w ...

EPFL2024

Afficher plus