As awareness of environmentally sound architecture increases and government regulations surrounding the energy efficiency of buildings become increasingly tight, many architectural features such as the brise soleil and external louvres have become commonplace, even if many people are unaware of their function. Many may assume that the aluminium curtains, glass louvres and sails which are increasingly an element of modern buildings, are just a design feature whereas their impact is far more than just decorative.
Given the popularity of programmes such as Grand Designs, the concept of passive solar heating and the use of better insulation to reduce heating costs is now fairly familiar. However, the opposite effect, passive cooling, is rarely considered, even though it is a technique which was used by the Ancient Egyptians! Less thought is also given, outside design circles at least, to maximising the use of natural light in new buildings, thus reducing electrical costs. Solutions that work with the sun to provide maximum natural lighting without glare and overheating are also still a fairly new concept.
However, the weird metal protrusions that stick out of many new buildings these days looking for all the world like an over-sized set of IKEA kitchen shelves can help with both cooling and lighting issues and many other more discreet design features, such as glass louvres, are also providing more than just a decorative function.
The term ‘brise soleil’ which, roughly translated from the French means ‘sun break’, refers in architectural circles to any permanent external structure which helps to stop the sun shining directly into a building. Some avant-garde architects have even built such a function into the main fabric of the building, such as Le Corbusier who created distinctive simply patterned concrete walls. More commonly, a structure made of a different material is used, such as steel or aluminium louvres. These can be angled to allow a building with a large glass façade to be protected from overheating during the summer when the sun is at a higher angle while maximising the intake of light and warmth from the sun during the winter months when the light comes in from a much lower angle.
The best firms are able to create detailed analyses of either existing buildings or the plans for new projects. These map out the angle of the sun during different seasons of the year and make proposals based on these calculations for appropriate sun-shading. Maple Sunscreening, for example, is a company which regularly advises architects and engineers on how to use features such as brise soleils and glass louvres to meet standards for CO2 emissions and combines advice on internal sun-screening with suggestions for outdoor screening such as external louvres to create an overall scheme which maximises long term reductions in the final building’s energy costs.
Please visit http://www.maplesunscreening.co.uk/ for further information about this topic.
http://www.maplesunscreening.co.uk/
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