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Related Concept Videos

Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

500
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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Conduction, Convection and Radiation: Problem Solving01:20

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Body Temperature01:25

Body Temperature

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The body's temperature, measured in degrees, is determined by the balance between heat production and dissipation to the surrounding environment. For instance, if exercising vigorously, the body will produce more heat, causing sweat and dissipating that heat. Despite extreme environmental conditions and physical exertion, the human temperature-control system maintains a constant core body temperature (the temperature of deep tissues, which are the tissues located beneath the skin and other...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
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Using a Thermal Camera to Measure Heat Loss Through Bird Feather Coats
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Heat Loss in Humans Warmed with Various Full-body Forced-air Heating Systems.

Fabio A Rodriguez-Patarroyo1, Lu Wang2, Berry Teunissen3

  • 1Outcomes Research Consortium, Department of Anesthesiology, Cleveland Clinic, Cleveland, Ohio; Oregon Health and Science University, Portland, Oregon.

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Forced-air warming systems effectively prevent hypothermia by significantly increasing skin temperature and heat flux. All tested systems demonstrated comparable efficacy in heat transfer and patient comfort.

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Area of Science:

  • Anesthesiology
  • Perioperative Medicine
  • Thermoregulation

Background:

  • Perioperative hypothermia is a common complication.
  • Forced-air warming systems are standard but comparative effectiveness data are limited.

Purpose of the Study:

  • To evaluate heat flux, mean skin temperature, and thermal comfort.
  • To compare five full-body forced-air warming systems.

Main Methods:

  • Randomized cross-over trial with 20 healthy volunteers.
  • Each participant used five different forced-air warming systems for 30 minutes with 45-minute washout periods.
  • Measured cutaneous heat flux, mean skin temperature, and thermal comfort.

Main Results:

  • All systems significantly improved heat flux and increased skin temperature within 15 minutes.
  • Average heat flux shifted from loss to gain within 5 minutes.
  • Skin temperature stabilized around 35.5°C.

Conclusions:

  • All tested forced-air warming systems effectively transfer heat.
  • No significant differences in heat transfer, skin temperature, or comfort were found between systems.
  • All systems are suitable for preventing hypothermia in surgical patients.