WEST PLAZA

Stakeholders

Function : Contractor

BRP3 SARL

Function : Assistance to the Contracting Authority

HRO France

Function : Construction Manager

International d'Architecture

Architect

Function : Construction company

Campenon Bernard Construction (Groupe Vinci)

General Contractor

Function : Assistance to the Contracting Authority

GreenAffair

 http://www.greenaffair.com


Assistance environment general contractor

Function : Environmental consultancy

Cabinet Alberto Pinto

interior decorator

Function : Environmental consultancy

Eric Ciborowski

Landscaper

Function : Company

Lefort Francheteau (Groupe Vinci)

CVC

Function : Company

Santernes (Groupe Vinci)

Electricity

Function : Company

SAGA (Groupe Vinci)

Plumbing

Contracting method

Lump-sum turnkey

Energy consumption

• Primary energy need : 86,10 kWhep/m².an
• Primary energy need for standard building : 177,50 kWhep/m².an

Calculation method : RT 2005

Breakdown for energy consumption : Consumption on the floor area of the project:
- Heating: 240062.6 kWh ep
- Cooling: 71873.46 kWh ep
- Hot Water: 159606.5 kWh ep
- Ventilation Auxiliaries: 303837.9 kWh ep
- Generation Auxiliaries: 42297.8 kWh ep
- Distribution Auxiliaries heat/cold: 453.37 kWh ep
- Llighting: 177705.7 kWh ep

Envelope performance

• Envelope U-Value : 0,88 W.m^-2.K^-1
More information :

Strips facade with extrenally insulated concrete aprons

Indicator : I4

Systems

Heating system :
• Heat pump
• Electric floor heating
• Fan coil
• VAV System
Hot water system :
• Individual electric boiler
Cooling system :
• Reversible heat pump
• Fan coil
• Floor cooling
Ventilation system :
• Nocturnal ventilation
• compensated Air Handling Unit
• Double flow heat exchanger
Renewable systems :
• Energy recovery from waste

Smart Building

BMS :

The BMS commissioned on the building is Johnson Controls, and operates under the BACNET LON protocols.

Urban environment

• Land plot area : 5 716,00 m²
• Built-up area : 100,00 %

Within close proximity to the La Défense business district, West Plaza is at the heart of an economic development area. As a modern and attractive economic showcase for the 1st business district in Europe, it seduces reknowned international companies attracted by this new urban trend along the T2 tramway line:
- A high concentration of installed companies
- The 5th HRO international quality project developed in this new business area.
- The renovation and improvement of the Champs Philippe neighborhood, of the Place de Belgique, Mission Marchand and Charles de Gaulle Boulevards.
- Close proximity of La Défense, 1st European business district with 1.500 head offices including 15 of the 50 first international companies.

Product

Central Air Treatment



FLAKTWOODS

4, avenue Laurent Cély 92600 Asnières sur Seine

 http://www.flaktwoods.com/


Product category : HVAC, électricité / ventilation, cooling

Every open space into offices compartment is treated individually by his own central air handling unit with turbofan no recycling and 100% fresh air. These units take air from the outside through the front of technical rooms. The air is heated or cooled by the use of a transfer wheel. The air is discharged through a chimney to the roof to keep out air discharges from air intakes.
Filters are placed upstream of the airducts supplied to an air filtration nine hygienic. All units are equipped with powerful filters. Technical specifications of the central air handling units : Classification: Their construction are self-supporting, without frame, to minimize thermal and acoustic bridges, guaranteeing excellent air tightness. They comply with the new European standards EN 1886, EN 13053, EN 13779 applying to air handling units.
Classes:
- Aluzinc sheet in 0.7 mm thick
- Resistance of the envelope: D2 Class
- Leakage of the envelope: L2 Class (leakage rate: 0.44l / sub s.m² a negative pressure of 400 pa) (leakage rate: 0.63l / s.m² under a positive pressure of 700 pa) -- - Leakage of the filter bypass: F9 Class
- Thermal conductivity: T3 class
- Thermal bridges: TB3 Class
- Thickness of panels: 50mm rockwool
- Density: 70kg / m³
- Corrosivity class (environmental class): standard C4 / C5 version unpainted stainless steel complying with the standards BSK94 / 99, ISO 12944-2 and ISO 9223, the eQ units are recyclable.

No product is ordered without prior acceptance of the client.

Water management

• Consumption from water network : 2 091,00 m³
• Consumption of harvested rainwater : 153,00 m³

Water Self Sufficiency Index : 0.07

Water Consumption/m2 : 0.07

Water Consumption/Work station : 0.94

Rainwater recovery is planned for watering green spaces only. Two watering basins are provided respectively in the basements -2 and -3.
Capacity : 32.52 m3 and 74.49 m3.

Water is provided to the sprinkler system from the rainwater collecting tank; if low, the system automatically switches to main water grid.
Lack of space on the project does not allow to recycle treated wastewater on site. The re-use of treated water is more suitable for high water use (eg for bathing water). In addition, the ground surface does not allow to integrate a waste water recycling system.

Indoor Air quality

An audit of the air quality was done with sampling points chosen to reflect the different sources of influence on parameters including the quality of the indoor air, CTA and the influence of materials and products used in the building. The following results of VOCs and formaldehyde are below the standard recommended values: - Inter entreprise restaurant, dining room: 64.56μg / m³ VOC including 3.45 g / m³ Formaldehydes
- Auditorium: 89,56μg / m³ VOC including 4.90 g / m³ Formaldehydes
- Salon 1: 55,39 g / m³ VOC including 1.73 g / m³ Formaldehydes

Office spaces are treated only with renewed air, thus ensuring hygienic air flows way above the regulatory hygienic air flows. The building has a mechanical ventilation in all rooms.
- Flow of fresh air toilet on office space = 250 111 m3 / h
- Maximum occupancy is 2,214 occupants.
- Flow of fresh air per occupant = hygienic minimum of 25m³ / h / occupier and up to 113 m³ / h / occupant
The CO2 sensors are installed in the lounges club and the auditorium (areas relevant for slaved airflows ).

Comfort

Health & comfort : One of the main concerns of the contractor is to promote the comfort and well being of users. For West Plaza, the contractor rethought the way office building is heated and cooled. The air conditioning system is an "All Air" type, meaning there is no air recycling in spaces and provides only 100% new air, thus ensuring hygienic air flows well above the regulatory hygienic air flows (optimized according to occupation). Each rental has its own central air handling unit. Through a reasoned ventilation, and a long thought positioning of heating and cooling emitters, the sensation of cold or warm air currents is suppressed. CO2 sensors are installed in the meeting rooms and the auditorium (relevant areas for slaved air flows).
The temperatures are maintained based on occupancy hours and presence detection. Users can also vary according to a comfort temperature range with remote controls. The mechanical ventilation vents are auto-adjustable.
An acoustic ambience quality is adapted to different spaces:
- Optimizing the level of sound insulation between the plates,
- Installation of high acoustic performance facades (against outside noises),
- Selection of equipments based also on low acoustic nuisance.
The building offers access to daylight and views through large window bays. All office spaces are located along the sides of the building and therefore have access to natural light and views. Cafeteria, Inter Enterprise restaurant, gym, kitchen and VIP rooms on the ground floor overlook the façades and thus also have access to natural light. All windows of office space are provided with sunscreens (inner fabric blinds over the entire periphery of the building). Wooden Venetian blinds are installed in VIP lounges, the restaurant and the gym, and aluminum blinds in the kitchen and cafeteria. The office floors have an optimal artificial lighting comfort providing superior illumination uniformity 0.6. The lighting level of 300 lux on the working plan for every office space. The selected office lights come from DEBBAS with very low luminance and 94% efficiency (2x14W) and used to validate a color temperature of 4000 K and a color rendering index (CRI) of 85. The UGR values (Unified Glaring Ratio) of less than 19 to ensure comfortable conditions for glare.
Remote controls are installed in the office floors and configured on the GTB. Presence sensors help provide sufficient lighting according to the kind of occupation.
Spaces that could emit odors are located in specifically positioned areas of the building (toilets, Inter Enterprise Restaurant, Waste) and have an efficient air treatment (pressure reduction) and an optimal air circulation.
Specific hygiene conditions are created to facilitate the maintenance of ponds by the choice of materials (wall tiles is quite high). The floors are provided with two local maintenance rooms per office space, sized for storing products.
Prevention of pollution risks and preservation of water quality to ensure water at 55 ° C in all parts of the loop network. The temperature of the loop system is monitored by the BMS, which will alert when temperatures go below 53 ° C. The cold water pipes are insulated with a vapor barrier to prevent condensation. Sampling taps are implemented near the users outlets to control the efficiency of the water treatment.

Measured indoor CO2 concentration :

RIE, salle de restaurant : 482 ppm ; Auditorium : 455ppm ; Salon N°1 : 562 ppm

Acoustic comfort : Acoustic measurements were performed on site to determine the minimum requirements in terms Sleeving facade and analyze more precisely what are the main sources of external noise to the site: the railway lines to 10 m (cat.1), traffic Road to the Charles de Gaulle Boulevard (cat.3) 100 m, traffic on the street Landing, air traffic, production or ventilation equipment businesses surrounding the site of the project. The results of acoustic measurements are:
- Facade Insulation
Acoustic insulation goals for office spaces on facades concerning the outside :
- Façade Nord :35 DnTA,tr ;
- Façade Est : 39 DnTA,tr ,
- Façade Sud : 42 DnTA,tr ,
- Façade Ouest : 39 DnTA,tr
Measured facade insulation performances in DnTA,tr (dB):
- Office space on 2nd floor Northern Facade: 38 DnTA,tr ;
- Office space on 2nd floor Northern Facade : 44 DnTA,tr ;
- Office space on 2nd floor Eastern Facade: 41 DnTA,tr ;
- Office space on 2nd floor Southern Facade: 42 DnTA,tr ;
- Office space on 3rd floor Southern Facade: 43 DnTA,tr ;
- Office space on 3rd floor Southern Facade: 45 DnTA,tr

Insulation for aerial noises:
Measured performances (DnTA (dB))
- Emission : 4th floor Office space Building #1 – Reception : 3rd floor office space Building #1: 49
- Emission : 3rd floor Bathrooms Building #1 – Reception: 3rd floor office space Building #1: 49
- Emission : 4th floor Office space Building #2 - Reception : 3rd floor office space Building #2: 50
- Emission : 3rd floor Bathrooms Building #2 – Reception : 3rd floor office space Building #2: 46
- Emission : 10th floor Terrace Building #1 – Reception : 9th floor office space Building #1: 60
- Emission : 10th floor Terrace Building #1 – Reception : 9th floor office space Building #1: 53
- Emission : 1st floor VIP Room - Reception : 2nd floor Office space Building #2 : 55
- Emission : 1st floor Auditorium - Reception : 2nd floor Office space Building #2: 53
- Emission : 1st floor Gym – Reception : 2nd floor Office space Building #2: 60
- Emission : 1st floor Restaurant - Reception : 2nd floor Office space Building #2: 55
- Emission : 1st floor Delivery area Building #1 - Reception: 2nd floor Office space Building #1: 53

Sound reverberation duration and Equivalent Absorption Area
Measured reverberation durations in 3rd floor Office space Building #2 :
Durations per octave bands (Hz):
3rd floor Building #1 bât1: 125: 0.8 / 250: 0.9 / 500: 0.6 / 1000: 0.8 / 2000: 1.4 / 4000: 1.4
R+2 bât2: 125: 0.8 / 250: 0.7 / 500: 0.6 / 1000: 0.8 / 2000: 1.3 / 4000: 1.3
Average sound reverberation duration Tr (500, 1000, et 2000 Hz): R+2 bât1: 0.9 -R+2 bât2: 0.9

Insulation against impact sounds
Measured performances L’nT,w (dB):
Emission : 4th floor office Space Building #1 - Reception : 3rd floor Office Spaces Building #1: 39
Emission : 3rd Floor Bathrooms Building #1 – Reception : 3rd floor Office spaces Building #1: 56
Emission : 4th floor office Space Building #1 - Reception : 3rd floor Office Spaces Building #2: 41
Emission : 3rd Floor Bathrooms Building #1 - Reception : 3rd floor Office Spaces Building #2: 33
Emission : 1st floor VIP Room – Reception : 2nd floor Office space Building #2: 33
Emission : 1st floor Auditorium - Reception : 2nd floor Office space Building #2: 38
Emission : 1st floor Gym – Reception : 2nd floor Office space Building #2: 32
Emission : 1st floor Restaurant - Reception : 2nd floor Office space Building #2: 30
Emission : Cafeteria – Reception : 2nd floor Office space Building #1: 41

Noise level of equipments in spaces to be arranged
Normalized levels with reverberation durations measured in office spaces:
1 GE on 10th floor terrace to 9th floor office spaces Building #1: 31.7
2 GE on 10th floor terrace to 9th floor office spaces Building #1: 32.32
Heat pump on 10th floor terrace to 9th floor office spaces Building #1: 31.1
Central air handling unit on 8th floor Compartment D – Measure 1 to 8th floor Office space Building #2: 36.1
Central air handling unit on 8th floor Compartment D – Measure 2 to 8th floor Office space Building #2: 35.4
Central air handling unit on 8th floor Compartment D – Measure 3 to 8th floor Office space Building #2: 33.0
Central air handling unit on 8th floor Compartment D – Measure 4 to 8th floor Office space Building #2: 30.7
Central air handling unit on 8th floor Compartment D – Measure 5 to 8th floor Office space Building #2: 33.2

GHG emissions

• GHG before use : 22,96 KgCO₂ /m²
• Building lifetime : 50,00 année(s)
• GHG Cradle to Grave : 1 148,00 KgCO₂ /m²

The test was done during the HQE Performance Test in 2012 and led by the HQE association. We used the ELODIE software to get all the necessary data.

Life Cycle Analysis

https://www.construction21.org/france/data/sources/users/813/resultats-west-plaza-50-ans---14112012.xls
Material impact on GHG emissions :

12.13

• Material impact on energy consumption : 42,43 kWhEP