The Role Of Measurement Accuracy On
The Heat Stress Assessment According To
ISO 7933: 2004
Author(s)
F. R. d’Ambrosio Alfano, B. I. Palella & G. Riccio
Abstract
The thermo-hygrometric risk analysis, regulated by several International
Standards, is one of the more relevant facets of workplace assessment. Based on
the predicted heat strain (PHS) model, the last version of ISO Standard 7933
devoted to the hot stress evaluation requires the measure of four physical (air
temperature, mean radiant temperature, humidity and air velocity) and two
subjective (metabolic rate and thermal clothing insulation) parameters. As far as
the measurement of microclimatic parameters is concerned, ISO 7726 Standard
suggests minimum and maximum accuracy values. On the other hand, for
subjective measurements the situation does not appear so clear since the
metabolic rate accuracy requirements are strictly related to the calculation
method, whereas any accuracy is actually suggested for the clothing insulation
evaluation. In order to evaluate the effect of the measurement accuracy on the
reliability of the hot stress assessment, this work reports a sensitivity analysis of
the PHS model to its independent variables. The results obtained clearly show
that the mean radiant temperature measurement appears a tricky matter since
only an error within the accuracy range can result in a very strong overestimation
(up to 5 hours) of allowable exposure times.
Keywords: heat stress assessment, accuracy, predicted heat strain.
1 Introduction
In the last sixty years several efforts have been devoted by the scientific
community to the formulation of a reliable index/method for the heat stress
Keywords
heat stress assessment, accuracy, predicted heat strain.
Related Book
Other papers in this volume
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