- Project plans
- Project activities
- Legislation and standards
- Industry context
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
A look at the Government's strategic approach.
Steps to help reduce the spread of infection inside buildings.
This social media-centred hobby can be both dangerous and illegal.
Millwork wall treatment with a long and illustrious history.
HSE introduces cumulative exposure calculator.
The Edwardians and their houses.
Cut off from civilian life for over 900 years.
Gaining green support from the carbon giants.
Medieval passageways with spiritual, transport and economic purposes.
Organisation receives accreditation from Investors in People.
Click the button to subscribe.
Communicating the right information at the right time.
Materials can take on different properties to control heat and glare.
Challenges in the construction sector and beyond.