PAGE 1 / 2 résidEncE lA sAuvEnièrE - 24/04/09

RéSIDENCE LA SAUVENIèRE

rEnEwAblE hEAt for 350 APArtmEntsChemin des deux maisons 71 - 1200 Brussels owner : Managimm sa (www.managimm.com)

Project managers : Modulo architects (www.modulo-architects.be) / Cogengreen (www.cogengreen.com) / ESE (www.ese-solar.com/ese)

La Sauvenière is an estate of buildings that was built in the late 1970’s. Since its construction, the residence has generated its heat in a centralised fashion for all the accommodation and communes it contains. Over the past few years, a green revolution has taken place in the re-sidence. Innovative installations, which have proven to be as beneficial financially as they are environmentally, have been installed.

What triggered this ecological initiative? Monthly heating bills, which skyrocketed in the winter of 2006, as a result of the high price of fuel oil and an extended cold season. The building’s admi-nistration resolved to tackle the problem and proposed to the residents that the energy sources for the residence be diversified. By the following winter, a cogeneration system combined with thermal solar panels were in operation. In the years to come, a rainwater recovery system and a system of photovoltaic solar panels could follow.

lA sAuvEnièrE in fiGurEsRealisation of the ‘green energy’ project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . November 2007Potential energetic power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 kWePotential thermal power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 kWthProject cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €490,000Running cost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .€88,500Aid with investment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €130,000Aid with production . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .€103,500/yearAnnual profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .€187,810/yearReturn on investment for project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 years

coGEnErAtion

Faced with such high heating costs, the solution that was finally adopted consis-ted of installing two 44 kW cogenerators in April 2007, to replace the two conven-tional 1,100 kW boilers. Fitted at a time when energy was cheap, these two boi-lers were of a size considerably surplus to requirements when they were installed.

To complete the system, a 750 kW condensation boiler was installed. This means that any heating requirements not covered by cogeneration can be met, by continuing to use the conventional urban gas supply.

The 44 kW cogenerator produces 25 kW of electric power. Run on biofuels (rapeseed oil) for over 7,000 hours per year, the two cogenerators can produce a total of 350 MWh. This energy is used to power the communal parts of the building (lifts, smoke extractors, car park lighting, etc.).

The fact that they produce both heat and electricity simultaneously means that massive savings can be achieved, since the amount of energy produced is very high. This is especially true in light of the aid for green electricity production granted by the Region of Bruxelles-Capitale, via the green certificate system.

thErmAl solAr PAnEls In November 2007, the co-owners’ association decided to invest in solar energy and thereby to optimise the currently unused roofs of the residence. The next step in the environmental project at La Sauvenière was thus to install 250 m² of thermal solar panels. These panels power 4 tanks of 2,000 litres of hot water, which residents now use to meet their needs on a daily basis.

The following hydraulic diagram illustrates the current status of the entire installation. The rapeseed oil tank is situated near the cogenerators, buried underground next to the heating facility.

intErEstinG fActRelighting the communal areas with higher-performance lamps has resulted in a 17% reduction in their electricity consumption. This simple measure, which operates at a more basic level than green energy production, has rapidly proven to be profitable for the co-owners’ association and beneficial for the environment.

PAGE 2 / 2 résidEncE lA sAuvEnièrE - 24/04/09

PAGE 1 / 2 “bâtimEnt ExEmPlAirE ”

AéroPolis ii - 24/04/09

“bâtImENt ExEmpLAIRE” : AéROpOLIS II

Can the additional cost associated with sustainable construction be curbed? The Aéropolis II office building has taken up the challenge. Where traditional constructions use multiple devices (and investors) to provide heating or air conditioning, the passive standard prevents heat loss and structural overheating. Aéropolis II will not feature cooling units, kilometres of lagging or false ceilings. The heating will be provided by a space heater (140 kW). On the other hand, Aé-ropolis II has the envelope of a passive building: airtight façade, triple glazing, solar protection and reinforced insulation. Financially, these measures are expected to increase the total budget by only 3% (including design costs) and result in energy savings of €32,000 per year. Overall, designing a building in this manner should pay for itself over a period of five years, and after that generate a gross profit of 3€/m² per year compared with the same building designed in the traditional manner.

AéroPolis ii in fiGurEsDelivery of work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .End of 2009Surface area of building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,539 m²Construction costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,260 €/m²Average subsidy for building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 €/m²Added cost of the initiative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 €/m²Annual profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.25 €/m²/yearSimple return on investment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 yearsHeating requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 kWh/m²/yearAir renewal rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6 vol/h

7,000m² of PAssivE officEs for An AdditionAl cost of undEr 3%

Avenue Urbain Britsier - 1030 Brussels owner : Huis van de Arbeid vzw / La maison du travail asbl

Project manager : Architectes Associés (www.architectesassocies.be) /Cénergie (www.cenergie.be)

vIEW OF THE FINAL PROjECT

EArth coolinG tubE And hEAt ExchAnGE The approach developed by the designers initially concentrated on eliminating air infiltrations and other heat bridges. Once the energy performance had been successfully improved, efforts were shifted to the energy supply itself.

In winter, the air is preheated by an earth cooling tube, which reheats cool air using the heat stored in the ground during summer. Inside the building, a heat exchanger stores the calories from the fouled air expelled. In summer, the air entering the building is cooled via the same earth cooling tube. The heat consumption is 6 kWh/m²/year.

thE chAllEnGE: KEEPinG coolOffices are densely populated and are packed with heat-generating equipment (artificial lighting, electronics), and thus face different challenges to residential buildings. Here, the task is not to keep warm – on the contrary, it is to keep from being warm.

Here, the passive standard has meant that the use of active air conditioning has been avoided. The cooling problem was solved using a series of structural systems. High-performance lighting coupled with regulating sensors and motion detectors reduce consumption and avoid any un-controlled power usage. Combined with powerful solar protection, the limited surface area of the windows reduces the thermal contribution from sunlight. Finally, a passive cooling system referred to as ‘free cooling’ was designed, to be used in conjunction with the earth cooling tube. Nighttime ventilation is carried out by sucking cool evening air into the offices via the motorised vents situated on the façade. The only actual active cooling element in the building is the system overseeing the cooling of the computer server.

intErEstinG fActTo keep energy losses to a minimum, the façade contractor Kyotech lent its research teams to the contracting authorities. Their aim was to perfect an airtight, prefabricated wooden fa-çade module, motivated by a desire to combine aesthetic appeal, reduced installation time and lower materials consumption.

PAGE 2 / 2 “bâtimEnt ExEmPlAirE ”

AéroPolis ii - 24/04/09

thE rEnovAtion of thE townhousE in fiGurEsDelivery of work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Avril 2009Surface area of building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.147 m²Construction costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420 €/m²Average subsidy for building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 €/m²Other aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 €/m²Added cost of the initiative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 €/m²Annual profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24 €/m²/yearSimple return on investment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 yearsHeating requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 kWh/m²/yearAir renewal rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 vol/h

“bâtImENt ExEmpLAIRE” : ARt DECO tOwNhOUSE

PAGE 1 / 2 “bâtimEnt ExEmPlAirE ”

Art dEco townhousE - 24/04/09

Located on the outskirts of the Forest Park on a bourgeois avenue rich in history, this grand townhouse was built by the Gillion family in 1932. This family of Brussels entrepreneurs were to live in the hotel until the end of the 1980s. At this point the building was put to a different use, becoming the premises of the Forest justice of the Peace.

The building then remained unoccupied for around ten years before it was repurchased. Since then, the building has been undergoing renovation with the aim of restoring it to its former glory. The goal is to preserve its authentic heritage whilst improving its energy performance. To tackle this thorny problem, the decision was made to use cutting-edge insulation and ventilation tech-niques. The results are very conclusive – the building is soon to acquire listed status, as well as being an excellent example of sustainable renovation.

This renovation also provided an opportunity to change the intended purpose of the building. Today, the building is mixed-use, with its floors being divided between accommodation and office space.

PrEsErvinG hEritAGE without wAstinG EnErGy

Avenue Besme 107-109 - 1190 Brussels owner : Foreign Office & CSI sa

Project manager : A³ Architecture (www.a-cube-architecture.com) / Cénergie (www.cenergie.be)

PAGE 2 / 2 “bâtimEnt ExEmPlAirE ”

Art dEco townhousE - 24/04/09

thE chAllEnGE of insulAtinG A listEd buildinGRenovating a listed building is more complicated than renovating a standard building, especially when the renovation in question is intended to achieve a certain level of energy performance. The issue of heat bridges is thus a particularly tric-ky one to resolve. As opposed to surface losses, which are quantified in W/m², heat bridges refer to losses through joints between surfaces (walls and ceilings, windows and frames, etc.). These lineic losses are quantified in W/m. The simplest and most effective way to eliminate heat bridges is to insulate from the exterior, by ‘wrapping’ every relevant element of the building. This could not be used as a general solution in the present case, however, for reasons including the historical value of the building.

Although exterior insulation was possible on the rear façade, the front façade’s greater richness in architectural heritage meant that the insulation had to be limited to the installation of double glazing. Overall, this process involved numerous difficulties and limitations. It therefore did not meet the passive standard, and was a merely low-energy renovation.

insulAtion mEAns vEntilAtionIn ordinary buildings, the envelope is typically very permeable. Although this means that air can be re-newed relatively quickly, it also causes massive and uncontrolled heat losses.

If a building is to have a good energy performance, exchanges of air with the exterior must be control-led. In order to do this, the envelope must be ren-dered as airtight as possible. And, in order to reco-ver the heat from the fouled air leaving the building, the air exchanges must be centralised. Thus, in the building on avenue Besme, the evacuation of fouled air is centralised into a conduit. This conduit crosses the conduit of fresh air entering the building, without mixing the currents themselves but exchanging the heat. In this way, 85% of the heat typi-cally lost by leaks is recovered. This largely compensates for the electricity consumption required to operate the ventilation system (CMv: controlled mechanical ventilation).

Moreover, an earth cooling tube placed upstream of the ventilation preheats the air entering the building in winter and cools it in summer. This recovers a few additional calories…

intErEstinG fActThe administrative formalities required for obtaining planning permission proved to be complicated. After the project was submitted to the communal and regional authorities, the Royal Belgian Commission for Monuments and Sites (CMRS) decided to submit an appli-cation to have the building listed for its façades and its interior. According to the CMRS, the building has one of the most well-preserved Art Deco façades in Brussels.

PAGE 1 / 2 PAssivE hEAdQuArtErs of cit blAton - 24/04/09

thE blAton PAssivE construction sitE in fiGurEsDelivery of work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . May 2009Surface area of building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,035 m²Construction costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €886/m²Added cost of the initiative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €75/m²Annual profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .€9.5/m²/yearSimple return on investment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 yearsHeating requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 kWh/m²/yearAir renewal rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 vol/h

pASSIVE hEADQUARtERS OF CIt bLAtON

CIT Blaton is a family-owned construction company with a distinguished history; it has been trading for the past 150 years. By renovating its headquarters ecologically, the company sent a powerful signal to the construction sector.

In 2004, CIT Blaton launched an architecture competition for the renovation of its site. This com-petition had two aims: to modernise the company’s image; and to set a proactive example in terms of sustainable development. This project is the first passive building to be built in Brussels.

The strategy of the winner (A2M) was to propose a low-energy renovation of the main building looking out onto the street and a renovation of the rear building to meet the passive standard, with architectural work being carried out where required. The project envisages two buildings, linked by a walkway that spans the truck access ramp. This glass connecting passage means that visitors entering the part of the site facing the street (reception, management and design department) will naturally be drawn to look or walk towards the rear section (boardroom, quoting department, cafeteria and leisure areas).

An EntrEPrEnEur is rEnovAtinG its hEAdQuArtErs to PAssivE stAndArds

Avenue jaurès 50 - 1030 Brussels owner : CIT Blaton SA (www.citblaton.be)

Project manager : A2M (www.a2m.be) / Arcadis-Gedas (www.arcadisbelgium.be)

3D vIEW OF THE BLATON HEADqUARTERS: LOW-ENERGy SECTION LOOKING OUT ONTO THE STREET (LEFT), ANNEx MEETING PASSIvE STANDARDS (RIGHT)

PAGE 2 / 2 PAssivE hEAdQuArtErs of cit blAton - 24/04/09

hot or cold: insulAtion tAKEs cArE of it The building consumes very little in terms of heating, particularly in the rear section. This section consumes 9 kWh/m² per year, and sin-ce this value is lower than 15 kWh/m² per year it means the building is a passive construction. Thanks to its thermal insulation of almost 24 cm of cellulose and its systematic elimination of heat bridges and leaks in the airtight enve-lope, the building does without conventional heating installations. The mechanical ventila-tion system with heat recovery is sufficient. This generates savings of around 90% compared with a conventional building.

Cooling, which is essential in office buildings, is also carried out passively. The inert nature of the concrete structure is also a factor in this regard, and external shutters minimise the level of sunlight entering the building. The adiabatic system (heat exchanger) is responsible for part of the cooling process, aided by natural nocturnal ventilation (rotating windows are opened auto-matically).

oPtimum liGhtinGAdvanced simulations of artificial and natural light levels were carried out to ensure that lighting installations were fitted in the optimum locations. These installations are fitted with light level detectors and favour natural light.

This strategy, coupled with a judicious selection of equipment, also made it possible to reduce overhead expenses linked to cooling the offices.

intErEstinG fActThe computerised false ceiling distributes the ventilated air and allows the space to be divided up flexibly. Each zone has its own heating outlet and air supply is adjusted based on how intensively the area is occupied.

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cAméléon storE - 24/04/09

thE EcoloGicAl invEstmEnt of cAméléon in fiGurEsDelivery of work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . February 2009Surface area of building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17,000 m²Construction costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €912/m²Average subsidy for building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €20/m²Other aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €60/m²Added cost of the initiative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €135/m²Annual profit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .€4.7/m²/yearSimple return on investment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 years

“bâtImENt ExEmpLAIRE” : CAméLéON StORE

Caméléon is a rapidly-growing Brus-sels company. It organises clearance sales of major brand-name clothing at several outlets throughout Bel-gium. In order to continue to grow as successfully as possible, Caméléon needed to extend its sales surface. The decision was taken to erect a new sales building. The contractor saw this construction project as an opportunity to put its environmental

beliefs into practice. 2.5 million euros were invested to do just this, and the result was a building that serves as a flagship of ecological commercial property. Its innovative design, combined with the fact that it produces renewable energy, should enable it to prevent the emission of 7,250 tonnes of CO2 over a period of 30 years.The overall project includes the construction of a building of 17,000 m², designed to house:• a large 8,000 m² specialised store• office and storage space• a crèche for 36 children created in association with the commune.

EcoloGicAl AnGlE of thE ProjEct1 - The building will generate renewable energy: photovoltaic solar panels and wind turbines2 - The building will be cooled and ventilated naturally (free cooling)3 - Natural light will be maximised: lighting wells and intelligent lighting4 - A high level of insulation (target is K26)5 - The materials chosen will be environmentally friendly6 - A green roof of 2,000 m² will be incorporated to maximise rainwater retention7 - Rainwater will be recovered and used8 - Construction elements will be prefabricated1 K = the building’s thermal insulation level. The lower the coefficient, the more effectively the building is insulated. The typical standard for buildings in Brussels is K55-65.

A GrEEn commErciAl buildinG built in An urbAn sEttinG

Avenue Ariane 12 - 1200 Brussels owner : Caméléon private sales (www.cameleon.be)

Project manager : Cwarchitects (www.awaa.biz) / Matriciel (www.matriciel.be)

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cAméléon storE - 24/04/09

frEE coolinG Retail clothing stores generally have high air conditioning requirements. The presence of custo-mers in the stores, together with the lighting needed to showcase the products, generates a signi-ficant degree of heat. The building’s architecture was specially designed to dissipate this heat:- the building’s specific orientation prevents sunlight from heating the parts of the building that

are heated by the business of the store;- the building’s openings are controlled automatically, allowing it to be cooled by the nighttime air;- very high ceilings mean that cool night air can circulate throughout the building;- the building has a high thermal inertia thanks to the use of concrete, which stores the nighttime

cool and redistributes it during the day;- the heat generated by artificial lighting systems is minimised, thanks to the optimisation of na-

tural light and the installation of low-energy artificial lighting systems;- the comfort limits in a commercial area have been revised in terms of the ambient temperature;- cladding and a sunshield have been fitted to the façades to protect them as much as possible

from the sun’s rays.

ProducinG GrEEn EnErGyThe overall target for renewable energy production is 65 MWh/year. This target is based partly on harvesting solar energy and partly on harvesting wind energy.

The site will be equipped with 78 photovoltaic modules of 230 watt-peaks (Wp) each. The total power of the photovoltaic field will thus be 17.9 kWp. The modules will be distributed partially across the upper roof area and partially across the pergolas installed on the green roof of the building. The two photovoltaic fields represent a total of 128 m² of solar panels. They are expec-ted to provide slightly over 14 MWh of power per year.

A study is currently being carried out to evaluate the site’s potential for wind turbines, with the idea being to install a wind turbine with an installed power of 25 kW and an annual production of 50 MWh. If this comes to fruition, it will be the first wind turbine of this size in Brussels.

intErEstinG fAct In association with the commune of Woluwe-Saint-Lambert (the Brussels commune in which the new building is to be constructed), Caméléon is opening a crèche with capacity for 36 children. It is intended for the residents of the quarters, employees of Caméléon and employees of the commune. This crèche will be the first in Brussels to be founded under a public-private partnership.

PAGE 1 / 2 l’oréAl buildinG - 24/04/09

thE low-EnErGy rEnovAtion of thE formEr l’orEAl officEs in fiGurEsDelivery of work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . May 2009Surface area of building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4,771 m²Construction costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . €891/m²Added cost of the initiative. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0Heating requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 kWh/m²/yearAir renewal rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 vol/h

The two hôtels de maître (1857 and 1858) on rue du Peuplier and the Union de Crédit building (1865) on rue du Rouleau typify the Béguina-ge quarter in which they are located. Their sober, balanced neoclassical architecture is centred around an interior courtyard. The site was until recently used by L’Oréal as offices, and is currently being converted for use for a different purpose. Once renovated, the building on rue du Rouleau will contain 28 apartments, accessible from the interior of the complex, and an underground car park of 18 spaces.

The renovation will heighten the contrast between the exterior façades, which will remain traditio-nal and unchanged, and the interior space, which is to be extensively renovated. The materials chosen were wood for the passageways, certain façades and window frames, and plaster for certain sections of existing walls. The renovation created accommodation with very low energy consumption. The apartments have been insulated thermally, on the outside for the walls looking out onto the interior of the complex and on the inside for the façades. The apartments are also to be fitted with a double-flow ventilation system including heat recovery. The rainwater recovered from the roof of the building on rue du Rouleau will be used for the toilets and washing machines and for cleaning the building.

This energy approach has been taken for all the apartments and will permit energy consumption to be reduced by 75% compared with a building meeting traditional standards. This represents a saving of 42,500 m³ of heating gas per year, or 105 tonnes of CO2 emissions that will be avoided.

officEs convErtEd to low-EnErGy AccommodAtion in A historic QuArtEr

Rue du Peuplier / rue du Rouleau - 1000 Brussels owner : City of Brussels, Urban Development Authority (www.bruxelles.be)

Project manager : A2M (www.a2m.be)

L’ORéAL bUILDINg

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hEAt-ExchAnGinG windows The Belgian climate means that accommodation more often needs to be heated than cooled.

The design of a building’s windows play a crucial role in this regard. In terms of heat, windows act in two opposing ways: (1) they produce heat from the sun’s rays, via the greenhouse effect; and (2) they represent a large surface area for heat exchange with the exterior, thus leading to heat loss. Well-de-signed windows can contribute to

achieving a positive energy balance, by ensuring that the energy provided by sunlight outweighs the energy lost through conduction.

As part of this renovation project, the windows facing south have been designed to be twice as large as the windows facing north. This will enable more heat to be received from the sun in winter. To prevent the building overheating during summer, the overhanging sections of the roof have been designed appropriately: taking advantage of the difference between the angles of incidence of the sun’s rays in summer and in winter, the overhanging sections of the roof block the sun’s rays in the summer but allow them to penetrate in winter.

Rolling shutters also enable the amount of heat produced by sunlight to be regulated during the summer. Thanks to these shutters, the degree of shade of the façade can be controlled.

ExtEnsion in thE stylE of thE QuArtEr The conversion of the building from offices to accommo-dation was accompanied by fitting an extension. Alongside this one-storey extension, the decision was taken that the building’s exterior would be white. This was to ensure the construction blended in as well as possible with the sur-rounding urban environment, which is largely composed of three-storey white buildings. The extension furthermore ad-vantageously converts the flats on what was formerly the top floor into duplex apartments.

The increase in volume was achieved using a structure made of wood, a durable and lightweight material. In addition, the thickness of the rafters in the framework made fitting the cellulose used for insulation an easy task.

intErEstinG fActThe renovation promotes pedestrian traffic between the exterior and the interior of the com-plex. It provides residents with a feeling of moving forward into a personal space: from the street into the lush interior courtyard, then to the passageway of their floor, and finally to their apartment, an oasis of peace and tranquillity in the heart of the city.

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“wAutErs” rEsidEncEs - 24/04/09

“bâtImENt ExEmpLAIRE” : “wAUtERS” RESIDENCES

“wAutErs” rEsidEncEs in fiGurEsAcceptance of works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .September 2008Area of the building . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313 m²Construction costs (excluding design) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279,000 € vAT excl.Total subsidy “Exemplary building” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31,325 €Cost overrun of initiative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55,000 € vAT excl.Heating requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 kWh/m²/yearAir renewal rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.57 vol/h

PAssivE construction, hiGh-QuAlity ArchitEcturE with Eco-construction!

Rue joseph Wauters 61 - 1030 Schaerbeek owners : Inès Camacho & Anita Biondo

Project managers : Architect : Inès CamachoEngineering design: Bart Humbeek

To affirm that a high-quality passive residence can be built for the price of a standard construc-tion, the developers-architect have developed a very restrained contemporary project with good spatial quality and comfort arising principally from the judicious choice of materials from the point of view of the environment and of health. The simplicity of the design and the standard utilisation of recognised and proven materials illustrate this approach.

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“wAutErs” rEsidEncEs - 24/04/09

The high quality of this project rests among other things on an architectural approach allowing flexible occupation (few or no heavy dividing walls). The plans have been drawn up to ensure an omnipresent natural luminosity by means of the large picture windows on the south and the skylight to the north, as well as a feeling of spaciousness, not to mention the attention given to heat loss, the pro-portions of openings in the spaces and the privacy of the occupants. There are a number of private exterior spa-ces, with a patio and a balcony for each of the 2 residen-ces. The utilities are located near the bathrooms, offering maximum space savings and a systematic location at each stage of construction.

The choice of “dry” construction (wooden frame), the utilisation of little energy during construction works, the use, as far as possible, of materials of organic origin and limited grey energy, the installation of exterior joinery all made of “passive” certified triple glazing, are all elements which, taken together, make this an exemplary project in the Brussels-Capital Region.

EnErGyThe two duplexes – the first to be constructed to the passive standard in the Brussels-Capital Re-gion – comply with the requirements for passive buildings, with a net heating energy requirement of 12 and 14 kWh/m²-year, and a measured airtightness of 0.57 vol/h (n50 value), in spite of a very large non-constructed shared wall. The energy necessary for supplemental heating is sup-plied by a heat pump linked to a vertical geothermal probe, coupled with mechanical ventilation.

wAtErTaps and showers with flow restrictors and water-saving flushes ensure rational use of water, while the layout of a garden, in place of a concrete slab impermeable to water, limits the runoff into the sewage system. A 7.500-litre tank gathering the rainwater collected on the roof supplies, among other things, the toilet flush.

mAtEriAlsThe building is almost entirely constructed of ecological materials. The two façades, the interme-diate flooring and the roofing are constructed of FSC wood frame with cellulose flakes, plaster on wood fibre insulation and fibro-plaster panels from the interior side. For reasons related to insulation thickness, the end wall on the other hand is insulated with expanded polystyrene, and covered by a sealant. The flat roof is covered by an EPDM membrane.

comfort And hEAlthParticular attention has been paid to the comfort and health of the inhabitants by use of natural paints and lacquers. The controlled mechanical ventilation, individual for each apartment, ensures a constant good air quality while recovering the heat from the extracted air.

intErEstinG fActThe Developer has provided a utility shaft to accommodate a pipe for a possible wood-bur-ning stove.