AA SED 2006 2007-autonomous sustainable island

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Building a Sustainable Island

Building a Sustainable Island

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  • 1. 53Figure 71: Abu Dhabi yearly temperature fluctuations.Source:YannasFigure 70: May, dry and wet bulb and Rh relationshipSource:YannasEvaporative CoolingpotentialsPrincipally, evaporative cooling can be aneffective passive cooling strategy when the wetbulb temperature is below 24ºC and the dry bulbtemperature is below 44ºC( Yannas.)temperature drop of 3-4Krelative to the outdoor dry-bulb.Based on the weather data analysis, in AbuDhabi indirect evaporative systems have a limitingpotential due to high dry bulb and wet bulbtemperature during the hot period when theoutside temperature is between 30 -35ºC. It mighthave limited applicability during the mild period(December to March ) when the daily averageoutdoor 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 inEvaporative cooling range due to high RH value65% and above, evaporative cooling will not ebaffective.Based on all the principles Evaporative coolingmight have some passive cooling potential andcan be sued on the outdoor and semi outdoorspaces of the islet, during the mild period Jan toMarch, November , December. This hypothesisneeds to be explored further.Givoni givesthe limits for applicability at wet-bulb of 25ºC anddry-bulb of 46ºC, with(Givoni 1994:14)Figure 69:Indirect passive Cooling with Water in the Gulf.Source: Farah Naz14.3 Evaporative Cooling Potential:14. Passive Cooling Strategies: