The new CHARIER headquarters in Coueron, was developed to bring the location of business decisions closer to the main partners and customers of the company.
The main features of the building, designed by Paumier Architectes, aims to represent the company specificities and strengths. In fact, the composition of the construction is around a courtyard that highlights the know-how of the company adjoining the building's exhibition hall.
Moreover, the entrance present a long facade made by wood and stones from from Péaule (one of the group's quarries) and the materials represents the images of the company's values.
The building, finalized in 2019, presented an overall building surface of 2270 m2, distributed on three floors.
The construction presents a concrete structure with a wooden external layer for finishing.
In particular, the external wall has a concrete layer f 20 cm as structural element and it is insulated with 24 cm of rockwool, for a final thermal transmittance of 0.16 W/(m2 K).
The structure of the roof is similar, with a concrete layer insulated, in this case, with a layer of 18 cm of polystyrene, for an overall u-value of 0.115 W/(m2 K).
The windows have a frame with a U-value of 0.84 W/(m2 K) and a high performance glasses (in total, according to the different orientations and window dimensions, there are 18 glasses) with an average U-value of 0.53 W/(m2 K) and solar transmittance of 31%, with the aim of reducing the cooling loads due to solar gains.
The HVAC system is based on the production from a reversible heat pump, supplying hot and cold water and it is integrated with radiant panels.
The domestic hot water is supplied by a thermodynamic water tank (250L) which supply the loop water network for (showers, lockers rooms and cafeteria). In addition, the system is integrated with small direct electricity water tanks for sanitary rooms (handwashing)
The design allows to both the energy demand and consumption, with annual heating demand of 10 kWh/m2 for year and 9 W/m2 of heat load, as calculated with PHPP evaluation.
Concerning primary energy, it is lower than the requirement (105 kWh/m2 year by the Passive House standard) and accounts for 49 kWh/m2 year, considering heating, domestic hot water, household electricity and auxiliary electricity calculated according to PHPP.
The design also allows to minimize the cooling needs, with 6 W/m2 of loads ad 1 kWh/m2 of cooling and dehumidification demand.