PREDICTION OF SURVIVAL TIME IN COLD AIR

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Authors
  1. Tikuisis, P.
  2. Frim, J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Describes the development of a simple heat conduction model for the prediction of survival time (ST) under sedentary conditions in the cold. Predictions are not made for cold injury nor for the injured individual. The model is based on steady-state heat conduction in a single cylinder comprised of a core and two annular concentric shells representing the fat plus skin and the clothing plus still boundary layer, respectively. The ambient condition can be either air or water; the distinction is made by assigning different values of insulation to the still boundary layer. Metabolic head production (M) is predicted by temperature signals from the core and skin, but is not allowed to exceed heat loss. Where the cold exposure is too severe for M to balance heat loss, ST is largerly determined by the heat conduction characteristics of the model. Where a balance occurs, ST is governed by the depletion time of the energy reserve for shivering. End of survival is marked by the core temperature reaching a value of 30C, although the model is capable of predicting lower body temperatures.
Keywords
SURVIVAL TIME
Report Number
DCIEM-94-29 —
Date of publication
01 Jun 1994
Number of Pages
35
DSTKIM No
95-00231
CANDIS No
144967
Format(s):
Hardcopy;Document Image stored on Optical Disk

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