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Geo-Climatic Applicability of Direct Evaporative Cooling in Italy

  • Giacomo Chiesa
  • Fabio Acquiletti
  • Mario Grosso
Conference paper

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.

Keywords

Climatic applicability Direct evaporative cooling Passive cooling GIS analysis 

Nomenclature

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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Copyright information

© Springer International Publishing Switzerland 2017

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Authors and Affiliations

  • Giacomo Chiesa
    • 1
  • Fabio Acquiletti
    • 1
  • Mario Grosso
    • 1
  1. 1.Department of Architecture and Design—DADPolitecnico di TorinoTurinItaly

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