NDLI: Estimation of respiratory heat flows in prediction of heat strain among Taiwanese steel workers

Content Provider	Springer Nature Link
Author	Chen, Wang Yi Juang, Yow Jer Hsieh, Jung Yu Tsai, Perng Jy Chen, Chen Peng
Copyright Year	2016
Abstract	International Organization for Standardization 7933 standard provides evaluation of required sweat rate (RSR) and predicted heat strain (PHS). This study examined and validated the approximations in these models estimating respiratory heat flows (RHFs) via convection (C res) and evaporation (E res) for application to Taiwanese foundry workers. The influence of change in RHF approximation to the validity of heat strain prediction in these models was also evaluated. The metabolic energy consumption and physiological quantities of these workers performing at different workloads under elevated wet-bulb globe temperature (30.3 ± 2.5 °C) were measured on-site and used in the calculation of RHFs and indices of heat strain. As the results show, the RSR model overestimated the C res for Taiwanese workers by approximately 3 % and underestimated the E res by 8 %. The C res approximation in the PHS model closely predicted the convective RHF, while the E res approximation over-predicted by 11 %. Linear regressions provided better fit in C res approximation (R 2 = 0.96) than in E res approximation (R 2 ≤ 0.85) in both models. The predicted C res deviated increasingly from the observed value when the WBGT reached 35 °C. The deviations of RHFs observed for the workers from those predicted using the RSR or PHS models did not significantly alter the heat loss via the skin, as the RHFs were in general of a level less than 5 % of the metabolic heat consumption. Validation of these approximations considering thermo-physiological responses of local workers is necessary for application in scenarios of significant heat exposure.
Starting Page	115
Ending Page	125
Page Count	11
File Format	PDF
ISSN	00207128
Journal	International Journal of Biometeorology
Volume Number	61
Issue Number	1
e-ISSN	14321254
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-06-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Iron and steel casting Required sweat rate Predicted heat strain Respiratory heat flow Metabolic rate Environment Biological and Medical Physics, Biophysics Meteorology Animal Physiology Plant Physiology Environmental Health
Content Type	Text
Resource Type	Article
Subject	Ecology Health, Toxicology and Mutagenesis Atmospheric Science

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