Effet radiatif : pourquoi votre toit se refroidit la nuit même en canicule

A little-known phenomenon is nonetheless essential for understanding summer comfort in homes: the radiative effect. Why can a roof cool down at night, even when the outside air remains very hot? What role does the sky play in heat exchange? Why is thermal lag so important in roof insulation? Through simple demonstrations and concrete measurements, I explain how radiant heat exchange directly influences the thermal comfort of our homes, both in summer and winter. You will discover, in particular: what the radiative effect actually is the role of the celestial vault (not in a hesoteric sense, but as a space that includes both the upper and very upper atmosphere, as well as even more distant celestial bodies…) how thermal phase shift works why roofs cool down despite warm nights Our mission: to raise awareness, inform, and train individuals and professionals for relevant, sustainable, and environmentally friendly renovations and constructions. Recommended video to see the invisible, infrared radiation:    • Le confort thermique grâce aux parements… ...   Co-authored article: https://www.soigner-l-habitat.com/con... ==== ⏱️ Chapters 00:00 What is the radiative effect? 02:02 The celestial vault and infrared exchanges 04:10 How thermal comfort works 05:36 Radiation: the main mode of heat exchange 06:55 Why roofs overheat in summer 08:20 Thermal phase shift and roof insulation 09:55 Why a roof cools down at night, even during a heatwave 11:28 Dew point and radiative cooling 12:40 How to use the radiative effect to improve summer comfort 13:18 Conclusion and additional resources ▬▬▬▬▬▬▬▬▬▬▬▬▬ 🏡 To go further 🏡 ▬▬▬▬▬▬▬▬▬▬▬▬ // My fundamentals for effective renovations: 👉 https://formation.soigner-l-habitat.c... // 150 reference articles: Soigner l’habitat: https://www.soigner-l-habitat.com/yd // My two books published by Terre Vivante Maison écologique : construire ou rénover ? https://www.terrevivante.org/boutique... The Keys to Ecological Thermal Comfort: https://www.terrevivante.org/boutique... // My Social Media LinkedIn:   / claude-lefrancois-a93047114   Instagram:   / soigner.lhabitat   Facebook:   / soignerlhabitat   ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 🏡 Habitologist 🏡 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ // How to become a Habitologist? 👉 https://formation.soigner-l-habitat.c... // Find a Habitologist near you? https://www.habitologue.com/yd: The directory of habitologists // What is a Habitologist? A Habitologist is an independent professional who guides clients to make their homes more comfortable, energy-efficient, healthy, and sustainable. They identify the factors that influence their comfort and provide the tools to make informed decisions based on a thorough understanding of their living space. Their impartial and objective approach ensures advice focused on their needs, free from commercial influence, thus preventing often unnecessary renovations. They help clients reduce the environmental impact of their homes and save energy. Finally, he offers solutions for preserving their homes and heritage in the long term. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ 🏡 Who am I? 🏡 ▬▬▬▬▬▬▬▬▬▬▬▬▬▬ // Claude Lefrançois, aka Papy Claude After 40 years in the building industry, including 20 years dedicated to sustainable building, I felt the need to share the knowledge and experience I had accumulated. As an author with Terre Vivante and host of the YouTube channel “Papy Claude,” I now devote myself to this sharing by building a network of professionals: the habitologists. The goal of this network is to help residents achieve their objectives: to attain comfort while significantly and genuinely reducing their environmental footprint (greenhouse gas emissions, resource use, etc.), and to respect the relationship between residents and their homes (housing sustainability, budget, etc.). Former craftsman, former project manager, former timber frame builder, trainer in ecological construction and insulation, author of articles... My favorite word? Relevance!