Geo-Climatic Applicability of Direct Evaporative Cooling in Italy
This chapter focuses on the climatic applicability of passive direct (downdraught) evaporative cooling (PDEC) techniques in the provincial capital cities of Italy. First, a PDEC potentiality map was produced using a previously developed method based on three variables: wet bulb depression, summer comfort air temperature threshold (25 °C) and cooling degree hours (CDHs). Second, an applicability map was produced by comparing the PDEC potentiality map to the local cooling energy demand. Third, a new method is presented including a calculation of the residual local cooling energy demand, i.e. residual CDH, related to air treatment by direct evaporative cooling. These residual CDH values were calculated considering different step-wise increasing outlet temperatures (WBT; WBT + 1 °C; …; WBT + 5 °C) as a function of the covered amount of wet bulb depression. Finally, three cities chosen as being representative of their respective Italian climatic macro-zones were selected in order to assess in greater detail the yearly variation of CDH aimed at supporting specific design strategies for ventilative passive cooling solutions.
KeywordsClimatic applicability Direct evaporative cooling Passive cooling GIS analysis
Wet bulb temperature
Dry bulb temperature
Wet bulb depression
Cooling degree hours
Temperature of comfort for adaptive model
External running mean temperature
Humidity rate [%]
Water vapour in mass unit of dry air [kg/kg]
Passive direct (downdraught) evaporative cooling
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