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

Wang Yi Chen, Yow Jer Juang, Jung Yu Hsieh, Peng-Chi Tsai, Chen Peng Chen

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)115-125
Number of pages11
JournalInternational journal of biometeorology
Volume61
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

Fingerprint

Steel
heat flow
Hot Temperature
steel
prediction
Sweat
international organization
physiological response
standardization
skin
evaporation
convection
Convection
rate
Workload
temperature
Linear Models

All Science Journal Classification (ASJC) codes

  • Ecology
  • Atmospheric Science
  • Health, Toxicology and Mutagenesis

Cite this

Chen, Wang Yi ; Juang, Yow Jer ; Hsieh, Jung Yu ; Tsai, Peng-Chi ; Chen, Chen Peng. / Estimation of respiratory heat flows in prediction of heat strain among Taiwanese steel workers. In: International journal of biometeorology. 2017 ; Vol. 61, No. 1. pp. 115-125.
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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.",
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Estimation of respiratory heat flows in prediction of heat strain among Taiwanese steel workers. / Chen, Wang Yi; Juang, Yow Jer; Hsieh, Jung Yu; Tsai, Peng-Chi; Chen, Chen Peng.

In: International journal of biometeorology, Vol. 61, No. 1, 01.01.2017, p. 115-125.

Research output: Contribution to journalArticle

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