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Ann. occup. Hyg., Vol. 17, No. 2, pp. 111-121, 1974
© 1974 British Occupational Hygiene Society
Published by Oxford University Press

research-article

AN ASSESSMENT OF A DYNAMICALLY-INSULATED HEAT-PROTECTIVE CLOTHING ASSEMBLY

G. W. CROCKFORD and M. A. AWAD EL KARIM

TUC Centenary Institute of Occupational Health, London School of Hygiene and Tropical Medicine London WC1E 7HT
Department of Social and Preventive Medicine, Faculty of Medicine, University of Khartoum Sudan

Experiments were conducted to evaluate the establishment of dynamic insulation in an air-ventilated heat-protective clothing assembly. A model of the fabric assembly used in the inner garment was also set up to enable a study to be made of the dynamic insulation characteristics of the fabrics. The experiments with the clothing assembly proved the establishment of dynamic insulation and these findings were confirmed by the results of the model experiments. Modifications made to the clothing assembly by sealing ankles and wrists and replacing the original outer garment with a more permeable one, showed that the dynamic insulation and the performance of the garment could be improved. Air flows in excess of 25 cfm (0·82 m3/min) are required to operate the assembly effectively in ambient temperatures of 50°C. The dynamic conductance values for the garment were lower than those predicted by the dynamic insulation equation.


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