Research needs informal exchanges
- Indoor Street as main public distribution and contact place
- Side greenhouses as place to rest and discuss
- Terraces are places to work

Astronomical research needs relations to our own earth and immediate environment
- Needs relation to the materiality of our environment: each work place has a contact with a garden or greenhouse spaces.
- Relation to natural material such as wood, stone and vegetation.

- Preservation of natural resources: using natural ventilation and catching solar energy through solar Pv cells
- Using local resources with wood coming from regional forest.

Connection to the existing building
- Round gallery in connection to the existing cafeteria terraces
- Cafeteria, council room, auditorium as new meeting place next to the main entrance
- Cafeteria as new focus point at one side of the street and

connecting the existing cafeteria. Outdoor cafeteria terrace is connecting place.

Landmark
- south façade/roof gently sloping to the preserve landscape
- conic cafeteria stands up from the (mythic) south as a “telescope” to the universe
- south outdoors parking are integrated in the shape of the building behind an underground level

1. perspective du hall d'entrée
de l'extension et rampe
de liaison avec l'existant
2. plan de rez-de-chaussée
organisation en peigne

SUMMER

1. Fresh air is taken in on the roof and chilled by evapotranspiration processes on the green roof
2. Recovered rainwater is vaporized on the green roof
3. PV cellsas solar protections on the glass roof of the atrium and feed the water pumps which supply rainwater and spray
4. Natural extraction by Venturi effect, chimney effect created by suction forces drawing the air from the circulations inside the buildings 5. Fresh air is sucked in, due to the chimney effect and due to the higher density of the refreshed air and then, flowing down to the different floors. Fresh air wich was pre-cooled by evapotranspiration on the green roof, enters the building to maintain its air pressure equilibrium and is then distributed on the different floors.
6. Fresh air distribution in false floor
7. Evacuation of exhausted air towards interior circulations (by means of natural ventilation)
8. Acoustic insulation in circulations’ false ceilings
9. Interior circulations acting as a natural ventilation pathway towards to the wind tower
10. Leisure terrace to hold meetings
11. Air distribution and natural ventilation underneath the glass roof of the green house
12. Evapotranspiration of the plants and gardens in the hall and in the vicinity of the façades
13. Solar protection by movable blades
14. Retention basins at the foot of the façades for collecting rain water, cooling of the courtyards and gardens by means of prevailing winds
15. Solar protections of the southern façades by light-racks to diffuse natural indirect light
16. Concrete ceiling for high thermal mass, dephasing day and night temperature thus driving night ventilation. Air-conditioning in particular buildings (server rooms, etc.), releasing recoverable heat energy
17. Opening façades and windows on courtyards and gardens for ventilation during mid-season.

WINTER

1. Fresh air is taken in on the roof and chilled by evapotranspiration processes on the green roof
2. Solar panels for domestic hot water production
3. PV cells to feed water pumps and provide electricity for appliances
4. Natural extraction by Venturi effect. Chimney effect drawgs exhaust air from the circulations of the buildings
5. Fresh air is sucked in, due to the chimney effect and due to the higher density of the refreshed air and then, flowing down to the different floors. Fresh air wich was pre-cooled by evapotranspiration on the green roof, enters the building to maintain its air pressure equilibrium and is then distributed on the different floors.
6. Fresh air is distribution in false floor and pre-heated by the concrete floor by the hot water heat exchanger and due to the domestic hot water distribution network.
7. Evacuation of exhausted air towards interior circulations (by means of natural ventilation)
8. Acoustic insulation in circulations' false ceilings
9. Interior circulation acting as a natural ventilation pathway towards to the wind tower
10. Leisure terraces for meetings in the green house
11. Green roof providing thermal mass and acoustic comfort
12. Highly insulated roof
13. Low-e glazing
14. Recreation and retention basins at the foot of the façades for green house
15. Adapted solar protections on the southern façades to diffuse natural indirect light and solar gains when desired
16. Concrete ceiling for high thermal mass, air-conditioning in particular buildings (server rooms, etc.), releasing recoverable heat energy
17. Curtains or night protection