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Evaporative heat transfer characteristics of industrial safety helmets
Luleå University of Technology.
1995 (English)In: Applied Ergonomics, ISSN 0003-6870, E-ISSN 1872-9126, Vol. 26, no 2, p. 135-140Article in journal (Refereed) Published
Abstract [en]

Thermal discomfort is one of the major complaints from the wearers of industrial safety helmets. While studies have been reported on dry heat transfer (conduction, convection and radiation) in safety helmets, the investigation of wet heat dissipating (evaporation) properties has not been found in the literature. To evaluate experimentally the evaporative heat transfer characteristics of industrial safety helmets, a method was developed to simulate sweating of a human head on a thermal head manikin, and to use this manikin to assess the wet heat transfer of five industrial safety helmets. A thermal head manikin was covered with a form-fitting cotton stocking to simulate 'skin'. The skin was wetted with distilled water to simulate 'sweating'. A form-fitting perforated polyethylene film was used to cover the wetted stocking to control the skin wettedness at two levels, 0.64 and 1.0. Experiments were conducted in a climatic chamber, under the following conditions: the ambient temperature = head manikin surface temperature = 34 +/- 0.5-degrees-C; ambient relative humidity 30% and 60%. Also, the effects of wind and a simulated solar heat load were investigated. The five helmets showed statistically significant difference in evaporative heat transfer under the experimental conditions. Skin wettedness, ambient humidity, wind and solar heat showed significant effects on evaporative heat transfer. These effects were different for the different helmets.

Place, publisher, year, edition, pages
1995. Vol. 26, no 2, p. 135-140
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
Industrial Work Environment
Identifiers
URN: urn:nbn:se:ltu:diva-2586DOI: 10.1016/0003-6870(95)00010-AISI: A1995RB13900008PubMedID: 15677011Scopus ID: 2-s2.0-0029278604Local ID: 03852940-d4b1-11db-8550-000ea68e967bOAI: oai:DiVA.org:ltu-2586DiVA, id: diva2:975439
Note
Godkänd; 1995; 20070317 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2021-12-13Bibliographically approved

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