Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.scs.2019.101727
Title: Dry mist systems and its impact on thermal comfort for the tropics
Authors: Zheng, Kai
YUAN CHAO 
Wong Nyuk Hien 
CEN CHAO 
Keywords: Science & Technology
Technology
Construction & Building Technology
Green & Sustainable Science & Technology
Energy & Fuels
Science & Technology - Other Topics
Dry mist
Evaporative cooling
Water droplet
Thermal comfort
Tropics
SKIN TEMPERATURE
URBAN SPACES
PERFORMANCE
ENVIRONMENTS
EVAPORATION
Issue Date: 1-Nov-2019
Publisher: ELSEVIER
Citation: Zheng, Kai, YUAN CHAO, Wong Nyuk Hien, CEN CHAO (2019-11-01). Dry mist systems and its impact on thermal comfort for the tropics. SUSTAINABLE CITIES AND SOCIETY 51. ScholarBank@NUS Repository. https://doi.org/10.1016/j.scs.2019.101727
Abstract: Tropical countries, like Singapore, are hot and humid throughout the year. Coupled with the Urban Heat Island effect from rapid urbanisation, Singapore has seen a long-term increase in annual average temperatures over the years. One solution is the use of misting systems that tap on the principle of latent heat of vaporisation to provide cooling. This paper specifically addresses the use of air-assisted “Dry Mist” systems, where the sprays are of ultra-fine droplet size, measured using PIV system in this study, and do not cause a wet sensation upon contact. This study has found that suitable operation conditions are during hot afternoons where Relative Humidity is lower, between 50–65%. Through both objective and subjective measurements, it was found that wind velocities above 0.58 m/s and Solar Irradiances above 571 W/m2 are the limits for operation. The subjective measurements also found majority of the participants feeling colder from the system, and despite a slight increase in skin wetness, there is also increase in wet feeling pleasantness. A statistical analysis also found that changes in Thermal Sensation Vote (TSV) is most significantly captured by changes in skin temperatures and wet feeling pleasantness vote, while changes in Thermal Comfort Vote (TCV) is most significantly captured by changes in Tmrt and Air Humidity Vote.
Source Title: SUSTAINABLE CITIES AND SOCIETY
URI: https://scholarbank.nus.edu.sg/handle/10635/193614
ISSN: 2210-6707
2210-6715
DOI: 10.1016/j.scs.2019.101727
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