aa sed 2006 2007-autonomous sustainable island
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Building a Sustainable IslandTRANSCRIPT
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Figure 71: Abu Dhabi yearly temperature fluctuations.Source: Yannas
Figure 70: May, dry and wet bulb and Rh relationship
Source:Yannas
Evaporative Cooling potentials
Principally, evaporative cooling can be an effective passive cooling strategy when the wet bulb temperature is below 24ºC and the dry bulb temperature is below 44ºC( Yannas.)
temperature drop of 3-4K relative to the outdoor dry-bulb.
Based on the weather data analysis, in Abu Dhabi indirect evaporative systems have a limiting potential due to high dry bulb and wet bulb temperature during the hot period when the outside temperature is between 30 -35ºC. It might have limited applicability during the mild period (December to March ) when the daily average outdoor air temperatures is between 20-23ºC.Figure 71.
From Figure 70, It is understood that In May, though dry and wet bulb temperaturse are with in Evaporative cooling range due to high RH value 65% and above, evaporative cooling will not eb affective.
Based on all the principles Evaporative cooling might have some passive cooling potential and can be sued on the outdoor and semi outdoor spaces of the islet, during the mild period Jan to March, November , December. This hypothesis needs to be explored further.
Givoni gives the limits for applicability at wet-bulb of 25ºC and dry-bulb of 46ºC, with
(Givoni 1994:14)
Figure 69: Indirect passive Cooling with Water in the Gulf.
Source: Farah Naz
14.3 Evaporative Cooling Potential:
14. Passive Cooling Strategies:
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