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Pablo Cabrejas Benito

SUSTAINABLE ARQUITECTURE

NATIONAL ASSEMBLY FOR WALES Richard Rogers


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THE PROJECT

In 1998 a design competition wasopenness and democracy itself; ope

is situated in the Cardiff Bay areaMillennium Centre. This area wascomplete the puzzle of developmeto meet the following stipulations.

Complete accessibility. Sustainability and renewable sour A minimum 100-year life span. Using Welsh materials.

The architect developed an idea for

had to be a transparent envelope,Assembly and encouraging the pudemocracy: Openness, transparenc

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held for building the National Assembly for Wales. The bnness for the surroundings and citizens themselves. It was

, close to the Victorian Grade I listed Pier head Buildinone the center of the coal exporting trade and the net in the immediate vicinity. According to the competition,

ces of energy.

a building that would connect with Cardiff Bay, Wales and

looking outwards to Cardiff Bay, providing visibility to theblic to engage with it. Again the main issue was to hiand participation.

Architecturally this is achieved byassembly members under the public,public part is elevated on a slate-clareinforces their importance in the demoDebating Chamber its not only situated

public, but its also in the physical andthe building. The roof, undulated, fallsDebating Chamber, creating a special snatural way of ventilation. The opennefor is represented in the transparencythat surrounds all the building. Theyissues, but without forgetting moreproject, as a public project, needed to h

This is the reason prefabricationoptimized. In addition, they used manarea, such us timber and slate sandston

challenging marine environment for a rleast 100 years.

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ilding had to expressfinished in 2006 and

and the new Walesconstruction had tothe building also had

beyond. The building

inner workings of theghlight the values of

placing the electedthe electorate. Thisplinth. This way it

cratic system. But thein a level below the

etaphorical center oflike a bell over theource of light and ass they were lookingrovided by the glasstook care of designphysical things. Theve a controlled price.as maximized and

materials from the, that could resist the

asonable price for at


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The design studied sustainabilityreasonable design answers to prconditioning is supplied in the debaare naturally ventilated. Heat exch

while the thermal mass of the plint

The Assembly program is quite cooffices for the principal officers of t

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part from the installation of technological devices. Itblems that do not imply higher costs, the design itsing chamber by the wind cowl over it, and all the other spngers use the potential of the ground to save energy in thtempers fluctuations in the internal environment.

mplex, and includes education spaces, a caf, meeting re Assembly, a members lounge and much more we can c

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orks because It haslf solves them. Air-

aces (the public ones)e cooling mechanism,

ooms, press facilities,eck in the sections.


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SUSTAINABILITY

The building was awarded the BRenergy demand; applying renewa

residual energy demand. So that,light and ventilation among other r

ILLUMINATION

The same philosophy for the whole

1. Maximum use of natural light2. Use energy saving light sources3. Using control systems to the inte

Roof lights and customized roof veinto the space, assisting daylightlantern has been installed on the da series of concentric aluminum rin

A conical mirror suspended under tinto the chamber. The mirrored conto the need of daylight levels and r

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EAM excellent rating for its environmental strategy bble energy sources and using energy efficient sources

he Assembly includes boreholes, greywater recycling, extsources we will classify and study in detail.

building was applied to enlightenment, based on three prin

ration of natural and artificial lighting.

ntilators serving the committee rooms / offices reflect lopenetration. To permit natural daylight into the debatinomed roof beneath the wind cowl. Daylight is reflected ints which make up the debating chamber funnel.

e wind cowl has been installed to reflect daylight from lowcan be manually raised and lowered into the throat of th

duce the possibility of glare.

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ased on reducing thend systems to cover

ensive use of natural

ciples:

-level winter daylightg chamber, a glazedo the space below via

altitude winter sunfunnel to respond


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Regarding the artificial lighting, e

Therefore, and as close as possible

chosen CDM metal halide lamps wit

4200 K. the result is a chamber il

projectors introduced at the base oring immediately above. Also oth

above, between the tubes to illumi

In addition, in the perimeter of

fluorescent lamps. We can observe

rings of lamps in the image.

With this combination of natura

workspace is enhanced, while it gi

broadcasting.

VENTILATION

The whole building is naturally vendebating chamber, committee roomventilation to the debating chamballowing air to be drawn out of thSHUNT. The inspiration comes frothrough the hop-drying kilns. With

from all offices and functional area

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bedding luminaries were chosen.

to the color of natural light, have

h a color temperature higher than

luminated by a single ring of 80

the vent pipe; with an aluminumr projectors have been installed

nate the surface of the vent pipe.

he chamber have been installed

his zenithal light and the different

l and artificial light, the public

ves facilities for TV recording and

tilated, although a mixed mode system can be used to as and public galleries its required. A six-meters-high rotatir. It rotates to produce a negative pressure on the leechamber, as it is explained in the drawing, working astraditional oast houses, which used self-orientating wi

this design complementing the global one, air conditionin

.

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sist ventilation in theng wind cowl providesard side of the cowl,some kind of perfectnd cowls to draw air

has been eliminated


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HEATING / COOLING SYSTEM

There are two remarkable heatingcolor, absorbs solar radiation andallows the entrance of solar light

entrance of light if necessary.

Furthermore, the Assembly countsstability to reduce primary energconventional chillers. This system isand low grade heat, which is requir

To reduce CO2 emissions even mo

green energy can maintain high grwithin air-handling units.

WATER

Potable water usage is minimized tis storage in a tank. This amount oand maintenance. Other adjustmeand fittings in the everyday consum

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-design points in this building. The clad plinth, with its mregulates thermal fluctuations in the inner space. In addiallowing some greenhouse effect. Nevertheless, this fa

with a ground source heat pump (GSHP) system, that uconsumption The GSHP system increases operation ef

enough to provide cooling for mixed mode spaces and tecd for the under-floor heating system.

re, there is also a biomass boiler processing both wood c

ade heating to heat emitters (low-level natural ventilators

hrough utilization of rainwater. Rainwater collected fromwater is enough for lavatories, irrigation for landscapingts and water reducing are achieved by the application oe.

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assivity and its blackion, the glass faade

ade can regulate the

ses grounds thermalficiency compared tonical computer suites

hips and pellets. This

and heater batteries

he large roof canopyand general cleaningappropriate fixtures

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