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Human Btu


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Heat. British Thermal Unit.

  1. The quantity of heat required to raise the temperature of one pound of water from 60° to 61°F at a constant pressure of one atmosphere.
  2. The quantity of heat equal to 1/180 of the heat required to raise the temperature of one pound of water from 32° to 212°F at a constant pressure of one atmosphere.

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Du Bois area: The surface area of skin of an "average" adult is 1.8 m2 (1.8 x 10.76 = 19.368 ft2) The total heat production of an "average" person at rest per hour is 58.2 x 1.8 = 104.76 = 105 watts (18.4 x 19.368 = 356.37 = 356 Btu's per hour).

 

The Du Bois area normally varies between 1.3 m2 (14 ft2) and 2.2 m2 (23.7 ft2) and in any setting the heat produced by sedentary adults will vary between about 75.66 watts (271 Btu's) for 1.3 m2 and 128 watts (459 Btu's) for 2.2 m2.

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