- Project plans
- Project activities
- Legislation and standards
- Industry context
- Specialist wikis
Last edited 09 Dec 2020
Evaluation of cooling effects: outdoor watermist fan
This article summarises a research paper ‘Evaluation of cooling effects: outdoor water mist fan’ by Craig Farnham, Kazuo Emura & Takeo Mizuno published in 2015 in --Building Research & Information, 43:3, 334-345, DOI: 10.1080/09613218.2015.1004844.
Evaporative spray cooling can improve thermal comfort and provide relief from thermal stress, even in a subtropical climate such as Japan. An experiment was carried out that combined a water mist spray with a fan and assessed its impact on the comfort of 141 participants on hot summer days. Participants were visitors to a public event held on 10–11 August 2013 in Osaka, Japan.
It was found that the cooling effect was highly efficient. The forced convection of the fan helped cool the skin and accelerate the evaporation of mist droplets that had adhered to skin and clothing. This produced an almost instant decrease in skin temperature. The mist and fan combination achieved localised cooling rates of more than 200 W/m2. Exposed skin temperatures could drop 2 K within 10 s with light wetting and were 1 K cooler even after leaving the mist. There was no correlation between time spent in the mist and degree of effect.
75% of respondents said the wettedness from the mist was pleasant, while 75% had claimed their state of wettedness before entering the mist (due to their own sweating) was unpleasant.
This technology has the potential to reduce heat stress and discomfort, particularly at large outdoor events and festivals. It could also reduce cooling loads within buildings by providing inhabitants with thermal relief outdoors. Continuing research will measure the effects of misting fans on people engaged in moderately strenuous activity in hot conditions.
 Find out more
 Related articles on Designing Buildings Wiki
- Automatic fire sprinkler systems: A good practice guide.
- Cooling systems for buildings.
- Evaluation of cooling effects: outdoor watermist fan.
- Personal protection watermist systems in the homes of vulnerable people.
- Sprinkler systems explained: A guide to sprinkler installation standards and rules.
- Watermist systems for fire protection in domestic and residential buildings DG 534.
Featured articles and news
Training reflects updated guidance in BSRIA BG 29/2021.
Complete list of 2021 winners now available.
Recognising past and present role models for the future.
So why not write something?
LETI publishes guidance for energy efficient home retrofits.
Predictions about adequate post-pandemic IAQ in non-domestic buildings.
Government publishes plans to 'build back greener'.
The contentious nature of claims associated with cladding, fire safety and EWS1 forms.
ECA comments on low-carbon heating systems initiative and Heat and Buildings Strategy.