Contribution of wetted clothing to body energy exchange and heat stress

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dc.contributor.author Elson, John
dc.contributor.author Eckels, Steven J.
dc.date.accessioned 2018-12-10T17:48:04Z
dc.date.available 2018-12-10T17:48:04Z
dc.date.issued 2018-12-01
dc.identifier.uri http://hdl.handle.net/2097/39383
dc.description Citation: Elson, J., & Eckels, S. (2018). Contribution of wetted clothing to body energy exchange and heat stress. Journal of Thermal Biology, 78, 343–351. https://doi.org/10.1016/j.jtherbio.2018.09.014
dc.description.abstract Quantifying the impact of clothing thermal and evaporation resistance is essential to providing representative boundary conditions for physiological modeling. In many models, sweat is assumed to drip off the skin surface to the environment and is not captured in clothing. In high metabolic rate and high temperature and humidity conditions the sweat produced by the body has the potential to saturate semipermeable clothing ensembles, changing the assumptions of the model. Workers, athletes and soldiers commonly wear encapsulating versions of such clothing to protect against environmental hazards. A saturated clothing model is proposed based on the ASHRAE two-node model using a saturated spot element in parallel with the existing method to account for sweat absorbed in the clothing. The work uses fundamental heat and mass transfer principles, modifying the existing formula using clothing measurements and basic assumptions. The effectiveness of the model is demonstrated by comparing the predictions of the original and proposed models, to the results of 21 soldiers exercising. The soldiers wore combat pants and shirt, helmet, gloves, shoes, socks, and underwear, and walked in a thermal chamber for 2 h at 42.2 °C dry bulb temperature, 54.4 °C wet bulb temperature, 20% relative humidity, and airspeed of 2 m/s. Core temperature, seven skin temperatures, heart rate, and total sweat loss were measured. The original model provides an average core temperature difference compared with the human subject results of 1.31 °C (SD = 0.557 °C) while the modified model improves the final prediction of core temperature to within an average of 0.15 °C (SD = 0.383 °C). The new model shows an improvement in the prediction of human core temperature under the tested conditions where dripping sweat will saturate clothing. The format can be used in multi-segmented thermal models and can continue to be developed and improved as more information on wetted clothing properties become available.
dc.relation.uri https://doi.org/10.1016/j.jtherbio.2018.09.014
dc.rights © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.uri https://www.elsevier.com/about/policies/sharing
dc.subject Wetted clothing
dc.subject Sweat
dc.subject Saturation
dc.subject Model validation
dc.subject Military ensemble
dc.subject Desert environment
dc.title Contribution of wetted clothing to body energy exchange and heat stress
dc.type Text
dc.date.published 2018
dc.citation.doi 10.1016/j.jtherbio.2018.09.014
dc.citation.epage 351
dc.citation.issn 0306-4565
dc.citation.jtitle Journal of Thermal Biology
dc.citation.spage 343
dc.citation.volume 78
dc.citation Elson, J., & Eckels, S. (2018). Contribution of wetted clothing to body energy exchange and heat stress. Journal of Thermal Biology, 78, 343–351. https://doi.org/10.1016/j.jtherbio.2018.09.014
dc.description.embargo 2019-10-5
dc.description.version Article: Accepted Manuscript


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© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ Except where otherwise noted, the use of this item is bound by the following: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/

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