IE_Lecture13-ed

IE_Lecture13-ed - Globe temp (GT) = black body absorbs...

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Lecture 13 Industrial Ergonomics (ENGR 3460U) Work Environment Design emperature Temperature structor: Dr Ahmad Barari Instructor: Dr. Ahmad Barari Barari- ENGR 3460U 1
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Ch. 6 – Heat • Heat stress a problem in industry man modeled as c linder ith • Human modeled as cylinder with: – core = trunk and head – Shell = skin Barari- ENGR 3460U 2
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• Heat exchange equation M S = M + C + R – E • Want S =0 – If S > 0 heat stress – If S < 0 hypothermia Barari- ENGR 3460U 3
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Comfort zone Psychometric Chart (DB vs WB vs Humidity) Barari- ENGR 3460U 4
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eat Stress Measurement Heat Stress Measurement BGT ( t lb be mperature monitor WBGT ( W et B ulb G lobe T emperature ) monitor – Dry bulb (DB) = normal temperature et bulb (WB) = evaporation from wick cools – Wet bulb (WB) = evaporation from wick, cools
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Unformatted text preview: Globe temp (GT) = black body absorbs radiation WBGT out = 0.7 WB + 0.1 DB + 0.2 GT W B G T in = 0.7 WB + 0.3 GT Barari- ENGR 3460U 5 Recommended WBGT Levels Barari- ENGR 3460U 6 nergy Energy Costs (kcal/min) Barari- ENGR 3460U 7 Control of Heat Stress Modify environment ventilation (fans) radiation (shielding) evaporation (AC ?? dehumidifier) evaporation (AC ??, dehumidifier) temperature (AC ??) odify work schedule workload Modify work schedule, Use work/rest cycles otation of workers (selection?) Rotation of workers (selection?) Cooling vests Barari- ENGR 3460U 8 Cold Stress Wind Chill index Barari- ENGR 3460U 9...
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IE_Lecture13-ed - Globe temp (GT) = black body absorbs...

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