本文件提供了与冷却材料相关的术语，以及建筑围护结构冷却表面的实施指南，以减轻城市过热影响。它专注于屋顶的应用。 该文件将侧重于地方当局和建筑/施工业主的城市地区。 CWA 17890:2022的用户将是地方当局、城市规划师，包括建筑、基础设施和景观设计师。 此外，冷材料的术语和特性将作为其他应用的参考，在这些应用中，冷材料的使用将对适应气候变化以及生活质量做出重大贡献，例如道路和路面。 虽然反射表面可能非常有益，但它们不适合或不适用于所有建筑物或建筑结构的所有气候，并提供了一些指导。

The document provides the terminology relating to cool materials and a guide to the implementation of cool surfaces for building envelopes to mitigate the urban overheating effects. It concentrates on the application to roofs. The document will focus on urban areas for local authorities and building/construction owners. The users of CWA 17890:2022 will be local authorities, urban planners for cities including construction, infrastructures and landscape architects. In addition, the terminology and characteristics of cool materials will serve as a reference for other applications where the use of cool materials will have a significant contribution to adaptation to climate change as well as quality of life, such as for roads and pavements. Whilst reflective surfaces can be very beneficial, they are not appropriate or effective in all climates for all buildings or building constructions and some guidance is provided.