International heat stress standards: a review

Article Abstract:

Inclusion of heat stress indices in international standards yields limits and methodologies for the evaluation, construction and regulation of hot thermal environments. While ISO 7243 evaluates hot environments on the basis of Wet Bulb Globe Temperature index, ISO 7933 is an evaluation system based on the Required Sweat Rate index and human heat balance equation. ISO 7933 predicts that an eight hour shift of work for an unacclimatized worker may not result in undue physiological strain. Two other systems, ISO 8996 and ISO 9920, discuss metabolic heat production and clothing insulation in detail, while ISO 9996 enables the measurement of physiological strain on workers.

Standards, Evaluation, Occupational health and safety, Occupational safety and health, International Organization for Standardization

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Climatic stress in coalmining in Germany: occupational health aspects

Article Abstract:

German coalmining regulations include aspects of heat stress standards and mining safety regulations for mine rescue activities. An additional medical examination, under basic effective temperatures beyond 25 degrees Celsius, is necessary to account for the strain resulting from heat stress while defining the climatic limits for routine mining operations. Climatic stress in mines can be minimized by enhancing the flow of fresh air, cooling of mine air by centralization or decentralization, slow acclimatization to heat and the use of ice-cooled jackets of heat-protective clothing.

Laws, regulations and rules, Germany, Coal industry

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Testing climate indices in the field

Article Abstract:

Results of field tests to assess the efficacy of the climate index, Required Sweat Rate, reveal that this index is the most suitable indicator of measured sweat rate and strain at work in a hot environment. The analytical climate index enables inclusion of new observations on the parameters of the model without influencing its validity. Mean skin temperature calculations with multiple linear regression and evaluation of the evaporative efficiency of sweating improve heat balance calculations and sweat rate measurements.

Measurement, Physiological aspects, Work environment, Perspiration

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