GB 50189-2015 第3.3.6条
| **** | **Thermal performance limits for exterior windows (including transparent curtain walls) (by climate zone)**: Based on the window-to-wall area ratio and climate zone, the heat transfer coefficient K and solar heat gain coefficient SHGC of exterior windows shall comply with Tables 3.3.6-1 to 3.3.6-5. For example: in cold zones, when the window-to-wall area ratio ≤ 0.20, K ≤ 3.0 W/(m²·K); when the window-to-wall area ratio is 0.20–0.30, K ≤ 2.7 W/(m²·K); when the window-to-wall area ratio is 0.30–0.40, K ≤ 2.4 W/(m²·K); when the window-to-wall area ratio is 0.40–0.50, K ≤ 2.0 W/(m²·K). |