Block Heat Flows by Radiation
 |
|
|
Heat flows by radiation are mainly through the windows but they can also affect heat flows by conduction if the wall overheats because of a dark color. The image of a building that would block solar radiation would be with small or well shaded windows and light colors in walls and roofs.
Some strategies that can be applied to achieve this are:
Appropriate handling of surface-volume relation
Use of shading devices and techniques
Selection of reflective and emissive materials for exterior surfaces
Principles to decrease solar radiation impact on transparent enclosures
Orientation of buildings and openings
Convenient handling of opaque-transparent surfaces relation
Use of shading devices
Glassed-in surface leaning variation
Use of reflective glass
Use of absortive glass
Use of selective glass
Use of photosensitive glass
Use of glass insulation
Zones:
The “block heat flows by radiation” zone begins at 21 C (70F) upwards. The lower portion of this zone is the lower portion of the comfort zone and indicates the point at which we should start blocking heat gains by radiation to avoid overheating of the building. It is also called the shading line. The higher up we go the more critical the need to block heat gains by radiation to the building.
