a field worker in florida is loading crates of oranges into trucks. it is quite

Question

a field worker in florida is loading crates of oranges into trucks. it is quite hot and humid, with a wet-bulb temperature of 82 degrees F, globe temperature of 87 degrees F, and a dry bulb temperature of 82 degrees F. it is estimated that each lift of the 30 lb requires 0.67 kcal of energy. the worker is expected to load 10 boxes per minute. what is the WBGT? what is the relative humidity ? is this an acceptable workload ? redesign the task, keeping the standard crate size/load the same, so that this would be acceptable work and so that the worker is most productive

Explanation / Answer

Wet bulb temperature, Tw= 82oF

Dry bul temperature, Td= 82oF which is equal to actual atmospheric temperature, Ta.

Globe temperature, Tg = 87oF

WBGT= 0.7Tw+0.2Tg+ 0.1Ta

WBGT = 0.7*82+0.2*87+0.1*82 = 83oF

Relative humidity = 100%, because wet bulb temperature=dry bulb temperature

Heat index, HI =  -42.379 + 2.04901523*T + 10.14333127*RH - .22475541*T*RH - .00683783*T*T - .05481717*RH*RH + .00122874*T*T*RH + .00085282*T*RH*RH - .00000199*T*T*RH*RH

Heat index = 96oF

From Heat Index chart , it is found that how hot it feels is 96oF. It indicates Extream caution. It may lead to heat stroke, heat cramps, or heat exhaustion possible with prolonged exposure and/or physical activity.

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