The new version of "public buildings energy-efficient (green building) design standards" (hereinafter referred to as the new "standard" “ ”) new mandatory provisions on the West outside the window, not for building self shading, green shading measures such as buildings toward the west window (including transparent curtain wall), window wall area ratio is greater than 30% the activities of external sunshade system should be set up. The director of the urban and Rural Construction Committee said that the activities outside the sun shading system include many measures, such as blinds shading, hollow louver shading, aluminum alloy grating shading, fabric shading and aluminum alloy wing shading. The transparent part of the roof is not more than 20% of the total area
As a mandatory provision in the new standard, the area of the transparent part of the public building is also clearly stipulated: it should not be greater than 20% of the total area of the building roof, and appropriate sunshade measures should be taken. “ the solar radiation intensity of the roof level is the largest, and the sun shading measures are very important. &rdquo, urban and rural construction commission people say, encourage the use of internal shading, external sun shading, active sun shading and other additional shading measures for transparent roofs. Urban heat island effect relief shading area of more than 50%
For outdoor activities such as walkways, courtyards, squares, recreation grounds and parking lots, the new standard requires that the area with shading measures should be better than 50%.
“ green shade, shade structures, buildings are self occlusion shading measures. ” urban and Rural Construction Committee official explained that the green shade area calculated in accordance with the crown projection area of adult trees; building shading area is calculated according to the projected area of building structures; self occlusion area in accordance with the summer solstice 8 points to 16 points within 4 hours in the shadow area venues area calculation. Public buildings within 500 meters bus station 800 meters railway station
The reporter learned that public transport has also been included in the green building design requirements. Among them, the distance between the public building site entrance and the bus station is no more than 500m, or the walking distance to the rail transit station is no more than 800m. At the same time, there are 2 or more than 2 bus (rail transit) lines in the 500m area.
In addition, there is a need for convenient pedestrian passageway to connect with public transport stations. The pedestrian passageway in the site should be accessible and accessible to the pedestrian passageway outside the building site.