Slide 12) Wet-Bulb Globe TemperatureHSISlide 4Slide 5FinalSlide 7Slide 8Review Questions for FinalSlide 10Slide 11IE 5531IE 553 Engineering of Human WorkDr. Andris FreivaldsClass #35IE 55322) Wet-Bulb Globe TemperatureWBGTout = 0.7 WB + 0.1 DB + 0.2 GTIE 5533HSI•Radiation - heat gain/loss, absolute temperatureR (kcal/hr) = 4.375 (TW - TSk)TW = [(TG + 460)4 + 1.03×108V0.5(TG - TDB)]0.25–460•Convection - heat gain/loss, air movement (ft/min)C (kcal/hr) = 0.189 V0.6 (TDB - TSk)•Evaporation - heat loss (only), evaporation of water (1 l = 580 kcal)Emax (kcal/hr) = 2.575V0.6 (PSk - PA)Psk = 42 mm Hg at 37°CIE 5534HSI•S = M ± R ± C ± Cd - E - W•If S = 0, then Ereq = M ± R ± C •HSI = Ereq/Emax •S (kcal) = BW (kg) × 0.83 × ↑TC•S (kcal) = (Ereq - Emax) x TimeIE 5535TotalFrequency100969288848076723.02.52.01.51.00.50.0Histogram of TotalIE 5536Final•Final Exam–Monday (12/18) 2:30-4:20 PM–307 Hammond–Closed book/notes–Bring 3x5” formula card–Similar to HW and Labs•Extra office hours: Mon 10:00-11:50 AM•Material covered: mostly since midterm, emphasis on work physiology not biomechanicsIE 5537 Sample Final Exam Question You have been hired as a consultant/ergonomist by the Bureau of Mines (research agency for mining, now consolidated under NIOSH) in order to evaluate the working conditions of bratticemen. Building brattices or stoppings for 8 hours is one of the more difficult jobs in coal mining. Typically, a bratticeman builds the wall from cinder blocks weighing 35 lbs each at a rate of 6 blocks/min. The wall is typically 3 blocks high and 15 blocks wide. NOTE that each row height is 12 inches to give a 36 inch wall. Assume an average coal miner is a male, 5 foot 9 inch tall and weighing 180 lbs. Because of water sprayed at the cutting coal face to keep down the coal dust, the relative humidity is 100% and globe temperature=dry bulb temperature = 80°F.IE 5538 a) Evaluate the work based on: metabolic energy expenditure, lifting criteria, and heat stress criteria. For each of the three criteria, calculate whether the conditions are acceptable. b) If they are not acceptable, calculate how much rest would be needed to make that an acceptable job and how much work they can safely perform (i.e either number of lifts/min or number of brattices/day) given that rest. If they are acceptable, calculate how many more brattices the bratticeman could complete in a day. c) What would you recommend to improve this job for all three aspects? Support your answers ergonomically.IE 5539Review Questions for Final 1) What factors affect the flow of blood through the circulatory system?2) Describe the peripheral vasculature.3) What extrinsic factors affect peripheral circulation?4) What intrinsic factors affect peripheral circulation?5) Describe how peripheral circulation change during exercise?6) How are respiration, ventilation, metabolism related?7) What factors affect the amount of oxygen delivered to the periphery?8) How is oxygen consumption related to work intensity?IE 553109) What factors affect O2 carrying capacity of blood?10) Why is aerobic metabolism so important for sustained work?11) What limits the amount of sustained work?12) Why are frequent short breaks more effective than long breaks?13) What is the primary method of O2 transport? Of CO2 transport?14) What are the various components of lung volume?15) What happens to the circulatory system during static contractions?16) What is the recommended 8-hr physical work capacity (RPWC)? How was it determined?IE 5531117) What factors change the RPWC?18) How is aerobic capacity found?19) How does aerobic capacity vary between individuals?20) How can a job energy requirement be found? What are the pros and cons of each approach?21) What symptoms may result from excessive heat?22) What methods are used to estimate the environmental heat load? What are the pros and cons of each approach?23) What physiological changes occur during heat
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