Abstract
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.
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Abbreviations
- WBT:
-
Wet bulb temperature
- DBT:
-
Dry bulb temperature
- dWBT:
-
Wet bulb depression
- CDH:
-
Cooling degree hours
- ext:
-
External
- int:
-
Internal
- Tset:
-
Set-point temperature
- Tc,a:
-
Temperature of comfort for adaptive model
- Text,a:
-
External running mean temperature
- φ:
-
Humidity rate [%]
- X:
-
Water vapour in mass unit of dry air [kg/kg]
- PDEC:
-
Passive direct (downdraught) evaporative cooling
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Chiesa, G., Acquiletti, F., Grosso, M. (2017). Geo-Climatic Applicability of Direct Evaporative Cooling in Italy. In: Sayigh, A. (eds) Mediterranean Green Buildings & Renewable Energy. Springer, Cham. https://doi.org/10.1007/978-3-319-30746-6_22
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DOI: https://doi.org/10.1007/978-3-319-30746-6_22
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