The UHI occurs when urban or developed land is hotter than surrounding rural and undeveloped land. Sunlight energy is absorbed by rooftops, pavements, structures, and other surfaces and then converted and released as heat energy into the air. Since the spacing of man-made structures is much more dense in urban areas, more heat is released causing the outside temperature in a city to be sometimes 6-8 degrees (F) hotter than rural areas.
Invisible Structures’ Product Line can help mitigate the effects of Urban Heat Island (UHI). Cool pavements, more trees, green roofs, and unique development options make ISI’s product line a perfect choice to help fight UHI in you site plans. Grasspave2 and Gravelpave2 address many components of Urban Heat Island mitigation including: thermal conductivity, heat storage capacity, density, albedo (see chart to right), and emissivity. Grasspave2 has the added component of “air-conditioning effect.”
SRI and Emissivity
- Cool Pavements – Grasspave2 and Gravelpave2 are some of the coolest pavements available. See the Sasaki Chart
- More Trees, Vegetation and Green Space – Grasspave2, Gravelpave2, Slopetame2 and Rainstore3 can help achieve these goals.
- Green Roofs – Draincore2 is a great solution for green roof drainage. Click here for more green roof information.
|Gravelpave2 Light Gravel*|
*The Lawrence Berkley National Laboratory (LBNL)
|Draincore2 Green Roof|
|Gravelpave2 with Light Gravel||.16|
*Grass has an effective albedo of 0.4, including a reflectance of 0.25 + 0.15 “effective reflectance” to account for evapotranspiration of well-watered grass. **Larger is better1