Chapter 12 Radiation Heat Transfer12-87 A car mechanic is working in a shop heated by radiant heaters in winter. The lowest ambient temperature the worker can work in comfortably is to be determined. Assumptions1 The air motion in the room is negligible, and the mechanic is standing. 2 The average clothing and exposed skin temperature of the mechanic is 33°C. PropertiesThe emissivity and absorptivity of the person is given to be 0.95. The convection heat transfer coefficient from a standing body in still air or air moving with a velocity under 0.2 m/s is hconv= 4.0 W/m2⋅°C (Table 12-3). AnalysisThe equivalent thermal resistance of clothing is Rcloth22clom . C / W = 0.1085 m . C / W==×°°0707 0155...Radiation from the heaters incident on the person and the rate of sensible heat generation by the person are
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.