Comprehensive Guide to Understanding Passive Cooling and Testing

Passive cooling is a vital strategy for reducing energy consumption in buildings, improving thermal comfort and decreasing dependence on air conditioning systems. This comprehensive guide focuses on understanding how passive cooling works, the relationship between solar reflectance, emissivity and the Solar Reflectance Index (SRI), and how these metrics relate to the effectiveness of cooling systems. A particular focus will be on Passive Daytime Radiative Cooling (PDRC), which is gaining attention for its potential to cool surfaces below ambient temperatures.