ara-anga
13 de jul. de 2013
27 de jun. de 2013
reabilitação em oeiras
De passagem por Oeiras, próximo a Lisboa, deparei-me com esta boa surpresa: a reabilitação e ampliação do Centro Cultural do Palácio do Egito, inaugurado em 2009 e projetado pelo arquiteto Fernando Vaz do Carmo, com a colaboração de Patrícia Fernandes. A intervenção pôs em evidência o edifício setentista com elementos contemporâneos que não o tocam e valorizou o centro histórico, ao criar novos espaços de encontro. enfase
26 de jun. de 2013
80 anos de Alvaro Siza
Para comemorar o aniversário de 80 anos do mestre Alvaro Siza (25 de junho), publico fotos de abril de 2013 das suas três principais obras em Lisboa. As 4 imagens acima mostram o elegante encontro do bloco administrativo com o pórtico que sustenta a famosa "tenda" de concreto protendido, do Pavilhão Português para a Expo'98.
A imagem à esquerda mostra o átrio e a escada rolante do Armazéns do Chiado, projetado junto com Souto de Moura após o incêndio que destruiu esta área da cidade em 1988.
As três fotos acima são da Estacão Baixa-Chiado do metrô de Lisboa, com detalhes da iluminação artificial e do corrimão. Leiam também:http://www.archdaily.com/393446/happy-80th-birthday-alvaro-siza/
Marcadores:
alvaro siza,
atualidades,
portugal
10 de nov. de 2011
skylight
Vistas sobre os telhados de Siena, Italia
VIEWS OVER THE ROOFS OF SIENA, ITALY
Vues sur les toitures de Sienne, Italie
Em cada foto acima podem ser vistas algumas
clarabóias, uma solução
bastante eficaz de iluminação
natural numa malha urbana densa como a da cidade medieval - ou a das grandes
metropóles atuais.
Por definição, uma clarabóia (SKYLIGHT) é uma abertura horizontal - ou levemente inclinada - e
paralela à cobertura, localizada no mesmo plano desta. Existe também o "monitor"
(ROOF MONITOR) que
consiste numa seção elevada da cobertura, com superfícies laterais
inclinadas ou perpendiculares à cobertura e com topo em vidro. Já um átrio é definido atualmente como um vazio
interno a um edifício ou entre vários edifícios, coberto
por grandes clarabóias ou diversos monitores, que tem origem nas casas da Roma e Grécia
antigas e ainda no pátio árabe.
Em comparação com a iluminação lateral (proveniente de aberturas nos
planos verticais do edifício), a iluminação zenital (proveniente de
aberturas nos planos horizontais de cobertura do edifício) promove a uniformidade da distribuição de luz. Por outro lado, ela faz
aumentar os ganhos em energia solar e as perdas térmicas por convecção e condução. Consequentemente, esse tipo de
abertura necessita um isolamento térmico ainda maior do que as janelas
laterais, em função das
características climáticas do local.
Marcadores:
italia,
sistemas controle luz natural
29 de out. de 2011
the importance of daylight 3
DAYLIGHT AND ENERGY EFFICIENCY
ANOTHER ASSET OF DAYLIGHTING IS ITS POTENTIAL FOR MINIMISING THE ENERGY CONSUMPTION OF BUILDINGS. LIGHTING REPRESENTS ROUGHLY ONE QUARTER OF THE ANNUAL ENERGY DEMAND IN A TYPICAL RESIDENTIAL BUILDING AND THREE QUARTERS IN A TYPICAL OFFICE BUILDING (WITH STANDARD INSULATION AND NO ACTIVE COOLING SYSTEM). THE HEAT GENERATED BY LAMPS AND OTHER FIXTURES ALSO RAISES THERMAL LOADS. CONSIDERING THAT BUILDINGS ARE RESPONSIBLE FOR AROUND 47% OF CO2 EMISSIONS WITHIN THE EUROPEAN UNION, ELECTRICAL LIGHTING HAS A DRASTIC IMPACT ON CLIMATE CHANGE.
THE ADVENT OF ELECTRICAL ENERGY AND THE DEVELOPMENT
OF INDUSTRIALIZATION IN THE NINETEENTH AND TWENTIETH CENTURIES, PARTICULARLY
THE VAST USE OF FLUORESCENT TUBE LAMPS IN DEEP PLAN OFFICES, BROUGHT ABOUT
A TYPE OF BUILDINGS EXTREMELY DEPENDENT ON ARTIFICIAL LIGHT. TODAY, DUE TO THE
INCREASING AWARENESS OF THE BENEFITS OF DAYLIGHT, THE TREND OF THE GOOD
ARCHITECTURE IS TOWARDS A SYNERGY OF NATURAL AND ARTIFICIAL LIGHTING. THEY
SHOULD COMPLEMENT EACH OTHER, AS CALDAS AND ROCHA (2001, P. 256) REMARK: “THE
ARTIFICIAL LIGHTING SYSTEM IS SUPPOSED TO BE CONTINUOUSLY DIMMABLE AND TO
PROVIDE JUST ENOUGH LIGHT TO MAKE UP FOR THE DIFFERENCE BETWEEN AVAILABLE
DAYLIGHT AND DESIRED SET POINTS”.
IMPROVING DAYLIGHT DOES NOT MEAN INCREASING
AS MUCH AS POSSIBLE ITS AMOUNT, MAXIMIZING THE SIZE AND PROPORTION OF GLAZING. TOGETHER
WITH LIGHT, WINDOWS PROVIDE OTHER DESIRABLE ELEMENTS, LIKE SOLAR RADIATION
CONTRIBUTING TO PASSIVE SOLAR DESIGN, VIEWS OUT, VENTILATION AND SOUNDS, BUT
ALSO UNDESIRABLE ELEMENTS, LIKE EXCESSIVE HEAT GAINS OR HEAT LOSSES, GLARE,
NOISE AND AIR POLLUTION, WHICH MUST BE CONTROLLED.
SUCCESSFUL DAYLIGHTING DESIGN MEANS
ACHIEVING A BALANCE POINT BETWEEN SUCH STRENGTHS AND DRAWBACKS, THUS REDUCING THE ENERGY DEMAND OF NOT ONLY ELECTRICAL LIGHTING
BUT ALSO MECHANICAL SYSTEMS FOR COOLING AND HEATING, TO PRODUCE A TRULY ENERGY
EFFICIENT BUILDING WITH LOW ENVIRONMENTAL IMPACT.
ON THE WHOLE, ONE OF THE DESIGNERS’
CHALLENGES IS TO WORK WITH THE INTERDEPENDENCE OF THE EMOTIONAL, PHYSIOLOGICAL,
FUNCTIONAL, AESTHETIC, ECONOMIC AND ENVIRONMENTAL ASPECTS OF DAYLIGHTING.
REFERENCES
Augustesen, Christina et al., Lighting Design:
Principles, Implementation, Case studies, ed. by Nicola Kollmann and
Christina Schulz (Basel: Birkhauser, 2006)
Caldas, Luisa and Joao Rocha, 'A Generative Design
System Applied to Siza's School of Architecture at Oporto', Caadria, 3
(2001) 253-264 <http://wwwfaculty.arch.usyd.edu.au/
kcdc/journal/vol3/caadria/Caldas.pdf> [acessed 06 Nov 2009]
21 de out. de 2011
the importance of daylight 2
DAYLIGHT AND
AESTHETICS
FROM THE NARROW BEAMS OF LIGHT ILLUMINATING THE STATUES IN ANCIENT GREEK TEMPLES, THE DRAMATIC CONTRASTS OF LIGHT AND SHADOWS IN THE BAROQUE CHURCHES, TO THE INFUSION OF LIGHT IN THE RONCHAMP CHAPEL, DAYLIGHT HAS ALWAYS BEEN USED AS A FUNDAMENTAL ELEMENT OF ARCHITECTURE, ACTING AS PLASTIC COMPOSITIONAL MATERIAL. APART FROM SATISFYING OTHER HUMAN NEEDS, BUILDINGS SHOULD SATISFY EMOTIONAL NEEDS, AFFORDING SENSORIAL PLEASURE AND THE SKILFUL PLAY WITH LIGHT IS ONE OF THE MOST EFFECTIVE MEANS BY WHICH SUCH A PURPOSE CAN BE ACHIEVED.
THE ROLE OF DAYLIGHT TRANSCENDS THE FUNCTION OF ILLUMINATION. IT HAS ALSO BEEN A SYMBOL OF “CLEANLINESS, PURITY, KNOWLEDGE AND HEAVEN” (MOORE, 1985). RELIGIOUS BUILDINGS HAVE HISTORICALLY EMPLOYED LIGHT “TO AROUSE FEELINGS OF MYSTICISM AND TO CONVEY THE SACREDNESS OF A PLACE” (PLUMMER, 2009).
MOREOVER, SHADOWS INTENSIFY THE EXPRESSIVENESS OF LIGHT AND THE PLAY OF BOTH CAN BE USED TO EMPHASISE THE COMPLEXITY OF THE SPATIAL COMPOSITION, ARTICULATING SPACES. IT CAN ALSO DEFINE SPACES, PUTTING IN RELIEF A PARTICULAR AREA OR REVEALING A PARTICULAR OBJECT.
PLUMMER (2009) MAKES A BRILLIANT ANALOGY SAYING THAT, FOR A MUSICIAN, THE VALUE OF A VIOLIN OR A PIANO LIES IN THE SOUNDS IT GENERATES AND SIMILARLY, FOR A VIRTUOSO ARCHITECT, A BUILDING IS AN INSTRUMENT WITH WHICH SUBLIME EFFECTS ARE CREATED OUT OF NATURAL LIGHT.
REFERENCES
Moore, Fuller, Concepts and Practice of Architectural Daylighting (New York: Van Nostrand Reinhold Company, 1985)
Plummer, Henry, The Architecture of Natural Light (London: Thames & Hudson, 2009)
20 de out. de 2011
the importance of daylight 1
DAYLIGHT AND HEALTH
NATURAL
LIGHT IS UNDOUBTEDLY MORE PLEASANT AND DESIRABLE THAN ARTIFICIAL LIGHT. THIS
FIRST SECTION OF THE SERIES OF POSTS "THE IMPORTANCE OF DAYLIGHT"
OUTLINES THE PHYSIOLOGICAL, PHYSICAL AND PSYCHOLOGICAL POSITIVE EFFECTS OF THE
ADEQUATE AND COMFORTABLE USE OF DAYLIGHT IN ARCHITECTURE.
TO
START WITH, THE CYCLICAL VARIETY OF LIGHT CONDITIONS (ALTERNATION OF DAY AND NIGHT)
GIVES A SENSE OF TIME AND ORIENTATION TO HUMAN BEINGS, STIMULATING AND
REGULATING THEIR BIORHYTHM AND HORMONAL DISTRIBUTION. FOR INSTANCE, THE
ILLUMINATION LEVEL, THE EXTENT OF EXPOSURE AND THE SPECTRAL COMPOSITION OF THE
LIGHT STRIKING THE RETINA, ALL OF WHICH CHANGE THROUGHOUT THE DAY, DETERMINE
THE SECRETION OF MELATONIN (SLEEP HORMONE). ANOTHER BENEFIT FOR HUMAN
PHYSIOLOGY IS THAT ULTRAVIOLET SUNLIGHT ACTIVATES THE SKIN’S PRODUCTION OF
VITAMIN D.
EXPOSURE
TO NATURAL LIGHT INCREASES HUMAN PHYSICAL ACTIVITY AND HENCE CONTRIBUTES TO
IMPROVE PERFORMANCE, MOTIVATION AND PRODUCTIVITY, CRUCIAL IN WORK AND STUDY
ENVIRONMENTS. BOTH POORLY LIT AND EXCESSIVELY LIT SPACES, ON THE OTHER HAND,
LEAD TO FATIGUE OF THE EYES AND BRAIN, CAUSING FREQUENT ACCIDENTS AND ERRORS.
NOT
ONLY THE AMOUNT OF LIGHT, BUT ALSO ITS QUALITY, AFFECTS VISUAL AND GENERAL
PERFORMANCE, AND HERE LIES ONE OF THE GREATEST ADVANTAGES OF DAYLIGHT IN
RELATION TO ELECTRICAL LIGHT. THE LATTER’S CONSTANCY AND UNIFORMITY CAN ALSO
RESULT IN TIREDNESS AND LACK OF ATTENTION. IT IS VERY HARD TO REPRODUCE THE
QUALITY OF DAYLIGHT WITH ARTIFICIAL SOURCES, MAINLY ITS WIDE SPECTRAL
COMPOSITION AND VARYING COLOUR TEMPERATURES.
LAST
BUT NOT LEAST, NATURAL LIGHT HAS THERAPEUTIC PROPERTIES, REDUCING STRESS AND
FEAR. SPECIALLY IF ASSOCIATED WITH VIEWS OUT, ALLOWING PEOPLE TO KEEP IN TOUCH
WITH NATURE AND THE CITYSCAPE, THE OPTIMIZED PROVISION OF DAYLIGHT INTO
BUILDINGS IS A POWERFUL STRATEGY TO HELP HEALING PATIENTS IN HOSPITALS OR, IN
GENERAL BUILDINGS, JUST MAINTAIN A HEALTHY PSYCHOLOGICAL STATE OF THE
OCCUPANTS.
THE
IMPORTANCE OF SUNLIGHT FOR GENERAL WELL-BEING BECOMES EVIDENT WHERE PEOPLE ARE
DEPRIVED OF IT. IN CONTRAST TO TROPICAL COUNTRIES, IN HIGHER LATITUDES
APPROXIMATELY 70% OF THE POPULATION ARE AFFECTED BY MINOR DEPRESSIVE MOOD
VARIATIONS AND AROUND 3% OF THE POPULATION SUFFER FROM SEASONAL AFFECTIVE
DISORDER - SAD, A CHRONIC DEPRESSION, DURING WINTER. REGARDLESS OF THE
LATITUDE, SPACES WITH INSUFFICIENT NATURAL LIGHT HAVE BROUGHT CONSEQUENCES FOR
PUBLIC HEALTH: FOR EXAMPLE, LACK OF DAYLIGHT IS THE SECOND MAIN CAUSE OF SICK
BUILDING SYNDROME - SBS.
REFERENCES
ANDER,
GREGG D, DAYLIGHTING PERFORMANCE AND DESIGN (NEW YORK: VAN NOSTRAND
REINHOLD, 1995)
AUGUSTESEN,
CHRISTINA ET AL., LIGHTING DESIGN: PRINCIPLES, IMPLEMENTATION, CASE STUDIES,
ED. BY NICOLA KOLLMANN AND CHRISTINA SCHULZ (BASEL: BIRKHAUSER, 2006)
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