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Cooling Efficiency of Different Air Velocities in Hot Environments.

PB297675

Publication Date	1979
Personal Author	Kamon, E.; Goldfuss, A.; Hodgson, J. L.; Loomis, J. L.; Dukes-Dobos, F. N.
Page Count	106
Abstract	Four heat acclimated college student volunteers were exposed for 90 minutes at each of the following combinations of work-heat conditions: (1) metabolic level (M) of 200 kcal.hr -1, and Wet Bulb Globe Temperature (WBGT) of 28.9 C, 31.1 C, 32.8 C and 34.4 C. Each of these had 32 exposures to the combinations of the above two M levels, four WBGT conditions and wind velocities of: 0.5m.s -1 (100 ft.min -1), 1 m.s -1 (200 ft. min -1), 2 m.s -1(400 ft.min -1) and 4 m.s -1 (800 ft.min -1). (2) M of 300 kcal.hr -1, and WBGT of 27.2 C, 28.9 C, 31.1 C and 32. C. Two additional heat acclimated college student volunteers were exposed for 120 minutes to the second combination of work-heat conditions. These two volunteers were exposed for 120 minutes to 16 of the combinations at M of 300 kcal.hr -1 only. This study was used to examine the effectiveness of increased wind velocity in reducing strain at each of the conditions described. The criteria for strain were the following physiological responses: rectal temperature, mean skin temperature, heart rate, evaporation and sweating rates. The physiological responses were measured at intervals throughout each exposure. There were differences in the physiological responses during the different WBGT conditions, there were no significant differences due to increased wind velocities under these conditions.
Keywords	Wind velocity Heat stress Stress(Physiology) Physiological effects Humans Exposure Responses Experimental data Effectiveness Skin(Anatomy) Temperature Metabolism Heart rate Evaporation Sweat cooling Maximum permissible exposure
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57W - Stress Physiology
Corporate Authors	Pennsylvania State Univ., University Park. Lab. for Human Performance Research.; National Inst. for Occupational Safety and Health, Cincinnati, OH. Div.
Document Type	Technical Report
Title Note	Research rept.
NTIS Issue Number	197920
Contract Number	PHS-NIOSH-210-75-0002

Cooling Efficiency of Different Air Velocities in Hot Environments.

Cooling Efficiency of Different Air Velocities in Hot Environments.
PB297675

Publication Date	1979
Personal Author	Kamon, E.; Goldfuss, A.; Hodgson, J. L.; Loomis, J. L.; Dukes-Dobos, F. N.
Page Count	106
Abstract	Four heat acclimated college student volunteers were exposed for 90 minutes at each of the following combinations of work-heat conditions: (1) metabolic level (M) of 200 kcal.hr -1, and Wet Bulb Globe Temperature (WBGT) of 28.9 C, 31.1 C, 32.8 C and 34.4 C. Each of these had 32 exposures to the combinations of the above two M levels, four WBGT conditions and wind velocities of: 0.5m.s -1 (100 ft.min -1), 1 m.s -1 (200 ft. min -1), 2 m.s -1(400 ft.min -1) and 4 m.s -1 (800 ft.min -1). (2) M of 300 kcal.hr -1, and WBGT of 27.2 C, 28.9 C, 31.1 C and 32. C. Two additional heat acclimated college student volunteers were exposed for 120 minutes to the second combination of work-heat conditions. These two volunteers were exposed for 120 minutes to 16 of the combinations at M of 300 kcal.hr -1 only. This study was used to examine the effectiveness of increased wind velocity in reducing strain at each of the conditions described. The criteria for strain were the following physiological responses: rectal temperature, mean skin temperature, heart rate, evaporation and sweating rates. The physiological responses were measured at intervals throughout each exposure. There were differences in the physiological responses during the different WBGT conditions, there were no significant differences due to increased wind velocities under these conditions.
Keywords	Wind velocity Heat stress Stress(Physiology) Physiological effects Humans Exposure Responses Experimental data Effectiveness Skin(Anatomy) Temperature Metabolism Heart rate Evaporation Sweat cooling Maximum permissible exposure
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57W - Stress Physiology
Corporate Authors	Pennsylvania State Univ., University Park. Lab. for Human Performance Research.; National Inst. for Occupational Safety and Health, Cincinnati, OH. Div.
Document Type	Technical Report
Title Note	Research rept.
NTIS Issue Number	197920
Contract Number	PHS-NIOSH-210-75-0002