Paris COP21: Cooling A Hot City | Page 6

TYPICAL: Paris 2003 HEAT WAVE: Paris - Highly directional constant winds - Night breezes might be useful for cooling the city - Lower speed variable winds - Non- directional Paris is usually humid Psychrometric chart Wind Rose 12 AM Air Temperature. < 30 C O 12 AM 6 PM 6 PM 6 PM 12 AM 12 AM 5 AM Aug Psychrometric chart 12 AM 12 AM 12 AM Wind Rose 12 AM 12 AM 6 PM - Heat wave was very dry - Water bodies / Vegetation are important 5 AM 5 AM 5 AM 12 AM 12 AM 12 AM Solar Radiation Aug Aug - Cloudless and high sun intensity - Shading is important Solar Radiation Aug - Temperature was very hot - Cool surfaces are needed to reduce the high air temperature Air Temperature. > 30 C O