| 1. |
- Bogerd, Cornelis P., et al.
(författare)
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A review on ergonomics of headgear: Thermal effects
- 2015
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Ingår i: International Journal of Industrial Ergonomics. - : Elsevier BV. - 0169-8141. ; 45:February, s. 1-12
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Forskningsöversikt (refereegranskat)abstract
- The thermal effects related to wearing headgear are complex and different studies have investigated single parts of this topic. This review aims at summarizing the different findings to give a complete overview on this topic as well as to suggest new perspectives. Headgear increases head insulation and therefore is mainly problematic under warm conditions, which is the focus of this review. Helmets do not affect physiological parameters other than the local skin temperature and sweat rate. However, the head is among the most sensitive body parts related to thermal comfort, thereby directly affecting the willingness to wear headgear. Several methods have been used to study thermal aspects of headgear, which could be categorized as (i) numerical, (ii) biophysical, (iii) combined numerical and biophysical, and (iv) user trials. The application of these methods established that heat transfer mainly takes place through radiation and convection. Headgear parameters relevant to these heat transfer pathways, are reviewed and suggestions are provided for improving existing headgear concepts and developing new concepts, ultimately leading to more accepted headgear. Relevance to industry: This review provides a sound basis for improving existing headgear concepts. Firstly, a concise overview of headgear research related to thermal effects is given, leading to empirically based improvement suggestions and identification of research fields with a high potential. Finally, relevant research methods are described facilitating evaluation in R&D processes.
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| 2. |
- Broede, Peter, et al.
(författare)
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The Universal Thermal Climate Index UTCI Compared to Ergonomics Standards for Assessing the Thermal Environment
- 2013
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Ingår i: Industrial Health. - 1880-8026. ; 51:1, s. 16-24
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Forskningsöversikt (refereegranskat)abstract
- The growing need for valid assessment procedures of the outdoor thermal environment in the fields of public weather services, public health systems, urban planning, tourism & recreation and climate impact research raised the idea to develop the Universal Thermal Climate Index UTCI based on the most recent scientific progress both in thermo-physiology and in heat exchange theory. Following extensive validation of accessible models of human thermoregulation, the advanced multi-node 'Fiala' model was selected to form the basis of UTCI. This model was coupled with an adaptive clothing model which considers clothing habits by the general urban population and behavioral changes in clothing insulation related to actual environmental temperature. UTCI was developed conceptually as an equivalent temperature. Thus, for any combination of air temperature, wind, radiation, and humidity, UTCI is defined as the air temperature in the reference condition which would elicit the same dynamic response of the physiological model. This review analyses the sensitivity of UTCI to humidity and radiation in the heat and to wind in the cold and compares the results with observational studies and internationally standardized assessment procedures. The capabilities, restrictions and potential future extensions of UTCI are discussed.
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| 3. |
- Kuklane, Kalev
(författare)
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Protection of feet in cold exposure
- 2009
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Ingår i: Industrial Health. - 1880-8026. ; 47:3, s. 242-253
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Forskningsöversikt (refereegranskat)abstract
- The paper summarizes the research on cold protection of feet. There exist several conflicting requirements for the choice of the best suited footwear for cold exposure. These conflicts are related to various environmental factors, protection needs and user comfort issues. In order to reduce such conflicts and simplify the choice of proper footwear the paper suggests dividing the cold into specific ranges that are related to properties and state of water and its possibility to penetrate into, evaporate from or condensate in footwear. The thermo-physiological background and reactions in foot are briefly explained, and main problems and risks related to cold injuries, mechanical injuries and slipping discussed. Footwear thermal insulation is the most important factor for protection against cold. The issues related to measuring the insulation and the practical use of measured values are described, but also the effect of socks, and footwear size. Other means for reducing heat losses, such as PCM and electrical heating are touched. The most important variable that affects footwear thermal insulation and foot comfort is moisture in footwear. In combination with motion they may reduce insulation and thus protection against cold by 45 %. The paper includes recommendations for better foot comfort in cold.
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| 4. |
- Kuklane, Kalev, et al.
(författare)
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Systematisk kunskapsöversikt 10. Occupational Heat Stress
- 2017
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Ingår i: Arbete och hälsa. - 0346-7821. ; 51:7
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Forskningsöversikt (refereegranskat)abstract
- The present review covers a wide scope of occupational heat stress related issues. The problematics related to climate change have placed heat exposure on the agenda. As a result, the research on heat effects has increased in recent years and a considerable amount of new material has become available. The literature includes general and specific reviews that focus on various heat-related aspects in detail. The aim of the current review is to compile the most relevant information, both past and present, that primarily covers knowledge on how one can carry out simple evaluations of heat stress in occupational settings. Very specialised information is described in full in the specific papers. The present review covers basic information on exposure to heat, descriptions of climatic factors and how they are measured. The review takes up human thermoregulation, heat exchange with the environment, and responses to heat. Several common hot environment evaluation methods along with heat assessment and management strategies are discussed. Sample industries are described.
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