HYDRO-ROOF A HYDROPONIC GREEN ROOF SYSTEM IN THE DESERT Green roofs are a popular sustainable strategy among architects and landscape architects. They are being incorporated to help with rainwater runoff mitigation a strategy known to reduce the Urban Heat Island (UHI) Effect. However, in a hot arid climate they exacerbate rather than mitigate the UHI. This is due to the high thermal storage capacity of soil required to sustain the green roof. UHI is a night time, rather then a daytime phenomenon, in such a climate.
Transcript
HYDRO-ROOFA HYDROPONIC GREEN ROOF SYSTEM IN THE DESERT
Green roofs are a popular sustainable strategy among architects and landscape architects. They are being incorporated to help with rainwater runoff mitigation a
strategy known to reduce the Urban Heat Island (UHI) Effect.
However, in a hot arid climate they exacerbate rather than mitigate the UHI. This is due to the high thermal storage capacity of soil required to sustain the green roof. UHI is a night time, rather then a daytime phenomenon, in such
a climate.
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Base Case Data_July 8,2011
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Test Cell 1_Saltillo tile_July 14, 2011
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Surface Temp. (deg. F) Ambient Air Temp. (deg. F) Growing Medium Temp. (deg. F) "In-between" Temp. (deg. F) Temp. above growing medium (deg. F) Relative Humidity (%)
THE EXPERIMENTIn order to make green roofs a sustainable strategy in a hot arid climate, the thermal performance of the hydro-roof was evaluated as a possible alternative.
Overnight studies of three test cells have been conducted during the month of July, 2011, in Tempe, Arizona. The results show both alternatives mitigate the UHI and provide additional benefits.
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LLBENEFITSIt improves thermal properties through external temperature regulation. Because the urban temperatures would be reduced the air quality would be affected positively. For example, the reduction of smog and air born particles.
The reduced overnight temperatures could increase the amount of precipitation and reduce the occurrence of dust storms.
It offers the benefit of increased biodiversity. Biodiversity is of great importance as it boosts the overall ecosystem productivity.
BASE CASE
TYPICAL ROOFASSEMBLY
Construction
Sensor placement
TEST CELL 1
Construction
SALTILLO TILE
Sensor placement
TEST CELL 2
Construction
Sensor placement
WITH SHADE STRUCTURE
The Hydro-Roof offers a potential for urban agriculture. By using abandoned space, food can be grown locally which is becoming more desirable due to the lack of space for food production within a city.
Additionally, the rising prices of fuel cause the food prices to increase.
Additional benefits include marketing of green branding a local job creations due to required maintenance and operation.
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