The PL Maître site accommodates 70 employees, all working in the study and production of metal structures for renovation, or involved in the design of the buildings of tomorrow. Today, in operation for a good number of years, the Vosges site itself is subject to compliance. In October 2019, it was also with a view to renovating the roofing devices that Bluetek's services were called upon, via our client and partner; the works agency Soprema Nancy.
The products today
The devices installed for the first phase of the work, now finalized, are:
- 4 Bluevault Therm, 3 m X 12 m, 16 mm thick polycarbonate filling incorporating Pearl Inside glass microbead technology.
- 17 Bluevault identical dimensions 3 m X 9 m.
These continuous skylights are fitted with 30 Exuplus Pneu smoke extraction modules, ie pneumatic SHEVs, each unit of which is associated with an electric cylinder stroke 500 mm allowing daily ventilation of the building. The devices replace old polyester vaults.
Even if the fact of using the existing hoppers was not enough to homogenize the interior natural lighting in an optimal way, and therefore to meet 100% the various criteria of the standard EN 17037, today the skylights provide safety and working comfort for users. Note that a new construction would have allowed another choice in device dimensions and a different layout.
In the meantime, the result is there and consistent. The installation, as it is carried out today, provides 300 lux for 50% of the working time (8/18 hour time slot), that is to say a quality lighting over the entire occupation time of the building.
Respect for standards and common sense
This renovation therefore meets compliance with smoke extraction in the event of a building fire through the compliance of the SHEWs with standard EN 12101-2 (continuous skylights comply with standard NF EN 14963).
Common sense was used in the choice of polycarbonate used in the composition of continuous skylights. Indeed, the vaults are all equipped with a 16 mm Pearl Inside alveolar PCA. This filling improves the sound and thermal insulation, the solar factor and a uniform diffusion of daylight inside the building. It also allows better visual comfort for users because it limits the risk of dazzling.
This choice therefore also matches the RE2020 standard in 3 of its performance requirements, i.e.
- Limiting primary energy consumption.
- Limiting the impact on climate change associated with this consumption.
- The limitation of situations of discomfort in the building during the summer summer period.
At the heart of the matter: the natural light tool
Beyond a regulatory observation, this building renovation was a very good subject of study for the Bluetek Technical Department. The service was able to confirm the effectiveness of its natural light calculation tool.
The result with the FLJ-meter
Daniele Mariotti, Bluetek Research and Innovation Engineer, was asked to carry out various tests in order to ensure the consistency of the Bluetek natural light tool with the reality on the ground. It was therefore in the office and on site that he carried out this study.
He carried out the FLJ (Daylight Factor) measurements according to the prerogatives of the EN 17037 standard. On a surface of 360 m², 40 points of light were measured 3 x 3 m.
After renovation work, the result is an average FLJ of 1,4%.
The Archiwizard "before / after" simulation
Let us start by specifying that the standard simulations do not take into account the bulkiness of the volume (frame, overhead crane, workstation, screens, this section, etc.).
On the PL Maître site, the calculations were carried out taking into account the reflection factors that are as close as possible to the reality of the land (i.e. gray cladding on the roof and on the facade), namely 0,4 for the roof and 0,4 , 0,7 for the facade. Normally, this ratio is 0,5 and 0,2 respectively. In the field or normatively, it is XNUMX for soils.
The result of this simulation is an average FLJ of 0,6%.
(Archiwizard simulation result before renovation)
The result of this simulation is an average FLJ of 1,5%.
(Archiwizard simulation result after renovation)
En conclusion
From 0,6% to 1,4% in actual results, the Daylight Factor more than doubled.
With a result of 1,5%, the Archiwizard simulation, or our natural light tool, is consistent.
Even if it remains of course perfectible, this method, thanks to our simulation tool, is therefore a precious help in the context of studies for all projects, whether new or for renovation.
Here, the Bluetek / Soprema synergy once again made it possible to materialize the results of the simulations in the field.
PL Maître: a sequel to come
This work in natural light was carried out on the first phase of this renovation. The actions to be followed are the optimization of the combination of natural and artificial light, ventilation and the possibility of cooling buildings by Bluetek adiabatic solution.