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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 Transfer01:14

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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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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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Body temperature reflects the equilibrium between heat production and heat loss within the body. Most heat is generated by metabolically active tissues, particularly the liver, heart, brain, kidneys, and endocrine organs. At rest, skeletal muscles contribute 20–30% of total heat production, but during vigorous exercise, this can increase up to 30–40 times.
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Thermoregulation01:26

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The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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Personal Thermoregulation by Heat-Conducting Engineered Materials.

Xiaofeng Jiang1, Zhuhua Zhang1, Wanlin Guo1

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Personal thermal management (PTM) textiles offer controlled heat exchange for optimal comfort. This study reviews advanced heat-conducting textiles, addressing current limitations and future potential in PTM applications.

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Area of Science:

  • Materials Science
  • Textile Engineering
  • Human-Environment Interaction

Background:

  • Personal thermal management (PTM) utilizes advanced textiles to regulate body-environment heat exchange for thermal comfort.
  • Heat conductivity is crucial for thermal transfer in PTM textiles, with engineered materials aiming to enhance warming and cooling.
  • Current PTM textiles face challenges in performance, wearability, and stability for daily use.

Purpose of the Study:

  • To introduce mechanistic models for predicting textile thermal conductivity.
  • To review advancements in single-function and bifunctional PTM textiles.
  • To analyze challenges and future outlook for heat-conducting textiles in PTM.

Main Methods:

  • Development of mechanistic models for thermal conductivity prediction in textiles.
  • Comprehensive review of stimuli-responsive materials and mechanical force-based designs for PTM textiles.
  • Analysis of scientific and technological challenges in PTM textile applications.

Main Results:

  • Mechanistic models for predicting textile thermal conductivity are presented.
  • Advancements in single-function (warming/cooling) and bifunctional (switchable) textiles are detailed.
  • Key challenges and future directions for PTM textile development are identified.

Conclusions:

  • Engineered heat-conducting textiles show promise for PTM, but performance and stability need improvement.
  • Stimuli-responsive materials and mechanical designs are advancing PTM textile capabilities.
  • Further research is needed to overcome challenges and realize the full potential of PTM technology.