Ecoffice
Last modified by the author on 30/06/2015 - 11:37
New Construction
- Building Type : Office building < 28m
- Construction Year : 2013
- Delivery year : 2014
- Address 1 - street : Avenue Robert Schuman, 71 1401 NIVELLES, Belgique
- Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
- Net Floor Area : 3 690 m2
- Construction/refurbishment cost : 4 107 000 €
- Number of Work station : 249 Work station
- Cost/m2 : 1113.01 €/m2
-
Primary energy need
47.9 kWhep/m2.an
(Calculation method : PEB - Wallonie )
The "Ecoffice" results from a research project laréalisation liability and sustainable commercial building DESBUREAUX the same cost as standard. It is certified liabilities and labelisé BREEAM "Very Good" for its sustainable building qualities.
This project is unique because all its parameters were studied and optimized manièresystématique by the partners to make a modèlereproductible, flexible and versatile. The research aimed to determine desoptima between functional requirements, technical choices, critèreséconomiques and principles of sustainable construction.
The parametric analysis focused on constructive energy and environmental aspects, through general themes as varied quel'implantation and building form, structure and choice desmatériaux, the isolation level, performance and choice of system design, lighting issues and natural light, etc.
In addition, a monitoring procedure has been set up by leCSTC: it began with the monitoring of future occupants in their bureauxactuels and will continue for three years after their installation in lesnouveaux offices.
Implantation
Work on the implementation and the shape of the building permisd'optimiser contributions in natural light while reducing déperditionsde heat. The optimization of solar gains, natural lighting and ventilation desbesoins has reduced the heating requirements in winter andthe risks of overheating in summer.
The project was installed in the ground in a north-south orientation; it uses the existing height difference to separate sonparking building. The remarkable trees have been preserved and integrated into the project.
Initially a simple compact rectangle shape in TheLength was divided to form two strips, which were shifted to improve lapénétration of natural light in the heart of the plates. An atrium is encorevenu strengthen this objective. In doing so, the blind nucleus (where rassembléssanitaires and vertical circulations) was reduced in favor of espacepériphérique offices.
Functionality and template
The design process has incorporated from the outset àl'énergétique aspects and lighting. All work spaces and have natural lighting, a guarantee of defonctionnement economy.
The design of the structure, technical installations and desfaçades sought to preserve the greatest possible flexibility in usagede space. The template has been optimized and corresponds to trays of ± 1 000m2, who accommodate as well as landscaping bureauxcellulaires.
The party retained the north-south orientation, reducing faces is etouest (the most difficult to control in terms of overheating). Façadessud the north and correspond to the same frame openings (randomly distributed manièresemi), but the side facing to the north is slightly glazed qu'ausud. In front, a color scheme forms a set of pixels surdimensionnésrépondant accents in the landscape.
Architecture
The parametric analysis focused on the constructive aspects, energy and environmental, through themes as varied as implantationgénérale and building form, structure and material selection, leniveau insulation, performance and choice of technical facilities, issues of lighting and natural light, etc.
In the evolution of the architectural approach, the estnaturellement liabilities associated with the logic of the building life cycle. He drove àinvestir the particular durability of structures, walls and walls, as projet.Réduire space technologies for the benefit of their architectonic A represents paradoxical challenge, which engaged them in a toujoursplus built energy, low tech and less delivered technology. It is also in what cecadre adopted Trias Energetica logic - "less better, otherwise", which control first reduce the need (energy, but also desurface, materials, water, etc. .) by working on the form and matter, before considering the improvement of technical systems and the use has other forms of resources (renewable, etc.).
Work on the implementation and the shape of the building permisd'optimiser contributions in natural light while reducing déperditionsde heat. The optimization of solar gains, natural lighting and ventilation desbesoins has reduced the heating requirements in winter andthe risks of overheating in summer.
In addition, a monitoring procedure has been set up by leCSTC: it began with the monitoring of future occupants in their bureauxactuels and will continue for three years after their installation in lesnouveaux offices.
Material
Several constructional variants were studied. The present variantelourde improved cooling needs combinaisonavec intensive night ventilation and helps mitigate detempérature peak during heat waves.
A typical analysis LCC (Life Cycle Cost) allowed the comparison del'impact environmental m2 of facade on the basis of an LCA for deuxdifférentes life (30 and 60) and considering different scenarios deremplacement.
The building is constructed of concrete frame and closed by a concrete block masonry remplissageen traditionally. External insulation Neopor ENEPS is then reported and coated. The gables are covered with unparement concrete blocks.
The building meets the passive standard with walls having U desvaleurs between 0.17 and 0.23 W / m2K. The windows are fitted detriple glazed north, but double glazing to the south.
Ventilation is dual-stream, of course, and the wheel exchanger permetde regulate humidity. The inertia of the building is utilized by Ades partial false ceilings in the office areas.
Primary energy
Geothermal (natural and nightcooling) = maximum energy saving significant investment maiscoût and need an extra in summer. The solutionsretenues are: backup heating: gas condensing boiler and heater + ventilation: double flow with heat recovery wheel. VMC.surdimensionnée for intensive ventilation in summer
(nightcooling) + extra cold: cold VMC Group.
Comfort
The initial choice of a lightweight construction was abandoned in profitd'une heavy structure for its qualities of inertia and mechanical strength, but also for its cost to comparable environmental impact.
Particular attention was paid to occupant comfort, a guarantee of good use of the building. To allow bureaupar office regulation, the heat is distributed by a circuit traditionnelet the extra hot water is provided by a condensing gas boiler. The system of ventilation is oversized to provide the necessary flow enventilation night intensive summer and a cold group is expected in réservepour possible heatwaves. Lighting installations are optimiséesgrâce choice of low-energy appliances and well positioned unerégulation by dimmers and motion sensors.
Passive and BREEAM certification label "Very Good" attest del'efficacité of the solutions and sustainability of the building.
One of the standard criteria tertiary liability is checking duconfort according to EN 13 251.
We must encode the building in a dynamic simulation program endécoupant trays by zones. This encoding also assess, Surle long term performance in naturally ventilated buildings. Cecritère is based on the comfort of theory of adaptive T °.
This model takes into account the adaptability of a building (and occupation) to external conditions. The passive building into the mind of an "adaptive" building, which allows interaction between the occupant and interior leconfort (opening windows, clothes fit for unepériode hot ...)
Natural lighting
The lighting consumption are one of the commercial buildings plusimportants positions.
Daylighting simulations encoding the building in lelogiciel radiance and 3D models in the lab tests CSEC réaliséssous an artificial sky (mirror-box) were used to investigate the influence of light on puitsde daylighting .
More? : Http://a2m.be/eco_office.html
Building users opinion
Below are reported the opinions of office occupants from a series of interview: - Not really a priori but positive surprise; - The work environment has improved; - The heat is correct, we have not got cold despite the harsh winter; - Automatic blinds are well regulated; - The space is very well thought out, everyone has enough space; - It feels good, it's good to live; - It is gratifying to work in a nice building, beautiful, representing the image of the company. Link to interview: http://www.ecoffice-building.be/
See more details about this project
http://a2m.be/eco_office.htmlhttp://a2m.be/2013_publication_febelcem_sur_ecoffice_et_haren.pdf
Data reliability
3rd part certified
Stakeholders
Designer
A2M
http://a2m.beMission complete
Other consultancy agency
CSTC
-
http://www.cstc.beMonitoring, control and project studies
Other consultancy agency
IMTECH
M.Hoebeke ; [email protected]
Special Technical Bureau
Contractor
Thomas & Piron et Holcim
Contracting method
Other methods
Owner approach of sustainability
As part of assisting innovative companies in the Walloon Marshall Plan 2.0 Green, the company Thomas & Piron has managed to bring together a consortium of architects, engineers, researchers and companies to study "in vitro "and detailed optimization of all parameters of a passive tertiary project. This pilot project has led to the construction of a passive and sustainable office building achieved at the same price as a standard desktop. It is occupied by the company Holcim. This project of "liability for all" is detailed on the www.ecoffice-building.be site. This project is certified Passive (certificate of a third party) and BREEAM assessed.
Architectural description
Concept of "design facade" The facade is designed based on a module of 1.20 m The volume set is accentuated by the inclinations of the parapets. Finally, dressing plays with an impression of the site before work. The image has been pixelated to reach a resolution to the size of the building frame. The result illustrates the work done on the report of nature and architecture which is inscribed.
Energy consumption
- 47,90 kWhep/m2.an
- 250,00 kWhep/m2.an
- 25,88 kWhef/m2.an
Envelope performance
- 0,33 W.m-2.K-1
- 3,32
- 0,30
Systems
- Condensing gas boiler
- Condensing gas boiler
- Others
- Nocturnal Over ventilation
- Double flow heat exchanger
- No renewable energy systems
Smart Building
Urban environment
- 10 000,00 m2
- 10,00 %
- 8 842,00
Product
Steelroc
HOLCIM
-
http://www.holcim.beGros œuvre / Structure, maçonnerie, façade
Metal fiber-reinforced concrete
Neopor
BASF
-
http://www.basf.be/
EPS graphite insulation
Easy application
Dual flow ventilation unit
Swegon
http://www.swegon.com/Génie climatique, électricité / Ventilation, rafraîchissement
CTA including a comfort ventilation High efficiency with low energy consumption (85% and 0.45 Wh / m³ certified by PHI) despite significant usage rates (up to 9000 m³ / h). This type of group is very suitable for passive tertiary buildings.
Validated
Gas condensing boiler
Remeha
http://www.remeha.beGénie climatique, électricité / Chauffage, eau chaude
Gas condensing boiler
Validated
Insulation for thermal breaks
Foamglas
http://be.foamglas.comSecond œuvre / Cloisons, isolation
This product is used to achieve the thermal breaks junction walls (wall / roof, wall / floor slab; lambda value about 0.05 W / mK)
Validated
Chassis (frame)
Salamander
http://www.sip-windows.comSecond œuvre / Menuiseries extérieures
Performance PVC frame (Uf = 0.89 W / m².K)
Validated
Triple glazing
Sprimoglass
-
http://www.sprimoglass.beSecond œuvre / Menuiseries extérieures
Triple glazing with high energy efficiency (Ug = 0.6, g = 0.61)
Validated
Construction and exploitation costs
- 4 107 000 €
Water management
- 550,00 m3
Indoor Air quality
Comfort
GHG emissions
- 12,86 KgCO2/m2/an