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Title: Should electric fans be used during a heat wave?
Authors: Jay, Oliver E.
Cramer, Matthew N.
Ravanelli, Nicholas M.
Hodder, S.G.
Keywords: Extreme heat events
Air flow
Issue Date: 2015
Publisher: Elsevier Science Ltd.
Citation: JAY, O.E. ... et al, 2015. Should electric fans be used during a heat wave? Applied Ergonomics, 46, pp.137-143.
Abstract: Heat waves continue to claim lives, with the elderly and poor at greatest risk. A simple and cost-effective intervention is an electric fan, but public health agencies warn against their use despite no evidence refuting their efficacy in heat waves. A conceptual human heat balance model can be used to estimate the evaporative requirement for heat balance, the potential for evaporative heat loss from the skin, and the predicted sweat rate, with and without an electrical fan during heat wave conditions. Using criteria defined by the literature, it is clear that fans increase the predicted critical environmental limits for both the physiological compensation of endogenous/exogenous heat, and the onset of cardiovascular strain by an air temperature of ~3-4°C, irrespective of relative humidity (RH) for the young and elderly. Even above these critical limits, fans would apparently still provide marginal benefits at air temperatures as high as 51.1°C at 10%RH for young adults and 48.1°C at 10%RH for the elderly. Previous concerns that dehydration would be exacerbated with fan use do not seem likely, except under very hot (>40°C) and dry (<10%RH) conditions, when predicted sweat losses are only greater with fans by a minor amount (~20-30 mL/hour). Relative to the peak outdoor environmental conditions reported during ten of the most severe heat waves in recent history, fan use would be advisable in all of these situations, even when reducing the predicted maximum sweat output for the elderly. The protective benefit of fans appears to be underestimated by current guidelines.
Description: This paper was accepted for publication in the journal Applied Ergonomics and the definitive published version can be found at: http://dx.doi.org/10.1016/j.apergo.2014.07.013
Version: Accepted for publication
DOI: 10.1016/j.apergo.2014.07.013
URI: https://dspace.lboro.ac.uk/2134/18684
Publisher Link: http://dx.doi.org/10.1016/j.apergo.2014.07.013
ISSN: 0003-6870
Appears in Collections:Published Articles (Design School)

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