foil

If there is a culture shock that we Spaniards suffer when crossing the Pyrenees, it is not the meal times or the language, but the painful absence of blinds and even air conditioners. Under normal conditions, it is a simple architectural anecdote, but during a sustained heat wave like the ones we are experiencing, it becomes a public health issue. A new remedy. During the last weeks of June and the beginning of this July, France and Germany have seen thermometers exceed the dangerous barrier of 40 ° C. Temperatures for which these countries were not prepared, and that is why they are resorting to different home remediessuch as cover the glass with aluminum foil kitchen towels or thermal blankets. Two measures that respond to the desperation of seeing how their houses heat up and do not have a barrier like we can have in Spain to block the impact of the direct sun. But in addition, we are also seeing how the heat It is becoming a political weaponwith different parties promising million-dollar aid funds so that citizens can install air conditioners. It has logic. Both private homes and some hospitals in Paris have joined this initiative due to the lack of air conditioning systems, and it is not a simple TikTok eccentricity, but rather it makes a lot of sense. The reason is that aluminum has a very high reflectance, being able to bounce between 95% and 98% of solar radiation. Normally, when sunlight passes through bare glass, the energy is converted to heat as it hits the floor and interior furniture, creating the dreaded “greenhouse effect.” By placing aluminum foil or thermal blankets on the windows, the radiation rebounds before heating the room. A simple gesture that can reduce the interior temperature between 5 and 7 ºCwhich is an abysmal difference that greatly reduces the discomfort caused by such high temperatures. It is not infallible. Turning the living room into a kind of spaceship is not an architectural panacea nor is it free of problems. Here Vicent Parasie, French architect, in statements collected by La Vanguardia point that this is an “emergency, economical and superficial solution, since it does not alter the home.” The architect warns that these patches can never replace adequate sun protection elements or good insulation. In fact, he points out that if the aluminum is placed inside and without adequate space, the thermal radiation rebounds and is trapped in the glass itself. This causes extreme overheating of the glass which, in cases of severe thermal stress, can fracture or burst. On the other hand, if placed outside, domestic aluminum deteriorates quickly due to the elements. The Spanish solution. All this phenomenon has revealed the enormous structural advantage of southern Europe in the face of new climate scenarios. And the difference between Spain and France in the face of this type of extreme heat episodes lies mainly in our better response to an architectural and cultural adaptation that we already have as standard. Our Mallorcan blinds or awnings are top-of-the-line technology against heat. As we have seen, the simple gesture of lowering an awning or a blind is capable of lowering the interior temperature by 4 or 5 ºC in a safe and long-lasting way. In Xataka | Popular wisdom is not always right: the great heat myths that we should avoid in summer