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Heat exchangers between body and environment.

J A Stolwijk

    Bibliotheca Radiologica
    |January 1, 1975
    PubMed
    Summary

    Human body heat exchange with the environment involves radiation, convection, conduction, and evaporation. Clothing properties and environmental factors significantly influence these heat exchange processes.

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    Area of Science:

    • Environmental physiology
    • Human thermoregulation

    Background:

    • The human body continuously exchanges heat with its surroundings through four primary mechanisms: radiation, convection, conduction, and evaporation.
    • Understanding these heat exchange processes is crucial for assessing thermal comfort and safety in various environments.

    Purpose of the Study:

    • To detail the components of the human body's heat balance equation.
    • To analyze how environmental conditions and clothing affect heat exchange.
    • To recommend appropriate modeling approaches for dynamic or localized heat exchange scenarios.

    Main Methods:

    • Detailed description of each heat exchange term (S = M-E-(+/- W)-C-R).
    • Consideration of environmental factors: air velocity, mean radiant temperature, water vapor pressure.
    • Evaluation of clothing properties: thermal insulation, vapor permeability.

    Main Results:

    • Environmental conditions and clothing significantly modify radiation, convection, conduction, and evaporation.
    • Specific factors like air velocity and clothing insulation directly impact heat loss or gain.
    • The heat balance equation provides a framework for quantifying human thermal exchange.

    Conclusions:

    • Accurate assessment of human heat exchange requires considering both environmental parameters and clothing characteristics.
    • For dynamic situations or localized body area analysis, dynamic mathematical models are recommended.
    • This study provides a foundation for understanding human thermal regulation in diverse conditions.

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