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Compagnon Raphaël

Compagnon Raphaël

Professeur HES associé


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Physique du bâtiment

Développement durable

Energétique du bâtiment

Energie solaire passive

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Professeur HES associé

Phone: +41 26 429 66 66

Desktop: B40.11

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

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




2018

Sky view factor as predictor of solar availability on building façades ArODES Scientifique

Chatzipoulka Christina, Compagnon Raphaël, Kaempf Jérôme, Nikolopoulou Marialena

Solar Energy, 2018, vol. 170, pp. 1026-1038

Link to the publication

Summary:

Solar availability on urban façades varies significantly, affected by obstructions by nearby buildings as well as orientation. A convenient way to evaluate their solar energy potential is deemed to facilitate the task of architects in increasing the use of photovoltaic systems and, thus solar energy generation in the urban environment. This study explores to what extent the sky view factor (SVF), a measure of the openness of a point to the sky, can be employed for evaluating solar irradiation of façades in complex urban scenes. For this purpose, extensive statistical analysis was performed testing the correlation of SVF with solar irradiances for 30 orientations, considering three European climates (i.e. Athens, London and Helsinki), and three periods (i.e. year, January and July). Special emphasis is put on global irradiance, which expresses the sum of three solar components, i.e. direct, diffuse and reflected. The study uses 24 urban forms - of 500 × 500 m area - in London for which SVF and solar irradiance simulations were performed for nine sky models (three locations by three periods). The results reveal a strong linear relationship (R2 > 0.8) between SVF and annual global irradiance in all orientations, at all three locations. In fact, as SVF was found to correlate well with both major solar components, direct and diffuse, it can be presumably used for predicting façades' annual solar irradiation at any location within the tested range of latitudes. With respect to monthly global irradiance, the relationship appears less consistent, affected by the increased sensitivity of the relationship of SVF with monthly direct irradiance to façade orientation and location's latitude, associated with the variations of solar altitude.behaviors, in the current and future climatic scenario.




2018

A simple tool for assessing solar and daylight access in urban canyons ArODES Conference

Raphaël Compagnon

Proceedings of EuroSun 2018 : 12th International Conference on Solar Energy and Buildings, 10 - 13 September 2018, Rapperswil, Switzerland

Link to the publication

Summary:

A new online tool to assess solar and daylight access over the surfaces enclosing an urban canyon (i.e. building façades and street) is presented. From a limited series of parameters, users can easily describe the orientation and geometry of an urban canyon and precisely define an area of interest for which the calculations have to be performed. By implementing an original calculation method based on stereographic pictures, this tool aims both to demonstrate its capabilities and to serve for architectural and urban planning educational purposes. Its main advantage is that, beside providing numerical indicators (e.g. solar exposure, solar irradiation, sky view factor, daylight sky component) that can take inter-reflections into account, it also allows to visually interpret the results in a rather intuitive manner. The calculation method is available as an open source software package. It can serve to assess solar and daylight access in more complex urban forms.


An image-based method to evaluate solar and daylight potential in urban areas ArODES Conference

Raphaël Compagnon

Proceedings of the Symposium on Simulation for Architecture and Urban Design, 4-7 june 2018, Delft, The Netherlands

Link to the publication

Summary:

Solar irradiance and illuminance are important renewable resources that can significantly increase buildings’ energy efficiency, associated to solar passive and active techniques and use of daylighting. In addition, it is widely acknowledged that the presence of natural light and some sunlight indoors is essential for inhabitants’ well-being. This paper presents a new method to assess solar and daylight availability in the built environment at different scales. The method is based on two types of images where the mutual obstruction between neighbouring buildings is represented over stereographic projections of the sky vault. The images can be used in two ways, either for the visual assessment of the examined surface(s) or, to be processed as to obtain a series of numeric performance indicators. In both ways, they can be combined with similar projections of the sun path or sky radiance/luminance distributions, for considering locations’ latitude and climate, respectively. To exemplify the use and relevance of the tools, especially at the early-design stages, the method is applied to compare the proposals submitted in a masterplan competition. The five finalists are examined in relation to the performance of their fac¸ades and roofs, as well as their impact on an existing fac¸ade. Last, a targeted analysis showed a good correlation between performance indicators, readily computed by the method, and predicted annual energy demands.


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