Generated heat through metabolism human skin continuously radiates approximately 1000 watts

Generated heat through metabolism human skin continuously radiates approximately 1000 watts

 
In a practical situation and room-temperature setting, humans lose considerable energy due to thermal radiation. The energy lost by emitting infrared radiation is partially regained by absorbing the heat flow due to conduction from surrounding objects, and the remainder resulting from generated heat through metabolism. Human skin has an emissivity of very close to 1.0, shows a human, having roughly 2 squares meter in surface area, and a temperature of about 307 K, continuously radiates approximately 1000 watts. If people are indoors, surrounded by surfaces at 296 K, they receive back about 900 watts from the wall, ceiling, and other surroundings, so the net loss is only about 100 watts. These heat transfer estimates are highly dependent on extrinsic variables, such as wearing clothes, i.e. decreasing total thermal circuit conductivity, therefore reducing total output heat flux. Only truly gray systems (relative equivalent emissivity/absorptivity and no directional transmissivity dependence in all control volume bodies considered) can achieve reasonable steady-state heat flux.

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