Natural ventilation and thermal comfort

air movement acceptability inside naturally ventilated buildings in Brazilian hot humid zone

Christhina Cândido*, Richard De Dear, Roberto Lamberts, Leonardo Bittencourt

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

8 Citations (Scopus)

Abstract

The literature on thermal comfort indicates that acceptable indoor air speed in warm climates should range from 0.2 to 1.50 m/s; yet 0.2 m/s has been deemed in ASHRAE Standard 55 to be the threshold of draft perception (i.e. not acceptable) inside air-conditioned buildings where occupants have no direct control over their environment. However, these air velocity ranges have not explicitly addressed air movement acceptability, but have focused mainly on overall thermal sensation and comfort. A large percentage of Brazil is classified as having a hot and humid climate. In such regions, natural ventilation combined with solar protection, is the most efficient building design strategy to achieve thermal comfort without resorting to mechanical cooling. The present research project aims to investigate the relation between air movement acceptability and thermal comfort inside buildings in the north-east of Brazil. The investigation has been developed using university buildings in Maceio city. Questionnaires relating to thermal acceptability were given whilst measurements (air velocity, air temperature, radiant air temperature and humidity), were simultaneously taken inside classrooms. Results indicated that at operative temperatures above 24°C, building occupants preferred mean air speeds up to 1m/s. It was also observed that complaints of draft did not occur in significant numbers until air speeds exceeded 1m/s.

Original languageEnglish
Title of host publicationProceedings of Conference: Air Conditioning and the Low Carbon Cooling Challenge - Windsor 2008 Conference
Publication statusPublished - 2008
EventConference on Air Conditioning and the Low Carbon Cooling Challenge - Windsor 2008 Conference - Windsor, United Kingdom
Duration: 27 Jul 200829 Jul 2008

Other

OtherConference on Air Conditioning and the Low Carbon Cooling Challenge - Windsor 2008 Conference
CountryUnited Kingdom
CityWindsor
Period27/07/0829/07/08

Keywords

  • Air movement acceptability
  • Air velocity
  • Hot humid climate
  • Natural ventilation
  • Thermal comfort

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