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Related Concept Videos

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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 heat.
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanism of heat transfer01:19

Mechanism of heat transfer

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...
Thermodynamic Systems01:06

Thermodynamic Systems

A thermodynamic system is a set of objects whose thermodynamic properties are of interest. The system is considered to be embedded in its surroundings or the environment. The system and its environment can exchange heat and do work on each other through a boundary that separates them. However, the immediate surroundings of the system interact with it directly and therefore have a much stronger influence on its behavior and properties.
Consider an example of  tea boiling in a kettle. The tea and...
Thermodynamics: Activity Coefficient01:24

Thermodynamics: Activity Coefficient

Activity is the measure of the effective concentration of the species in solution. It can be expressed as the product of the molar concentration of the species and its activity coefficient. The activity coefficient is a dimensionless quantity and depends on the total ionic strength of the solution.
The activity coefficient is a measure of the deviation from ideal behavior. When the ionic strength of the solution is minimal, the activity coefficient of an ionic species is close to unity, making...

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Related Experiment Video

Updated: Jun 6, 2026

Fabrication of Bi2Te3 and Sb2Te3 Thermoelectric Thin Films using Radio Frequency Magnetron Sputtering Technique
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Increasing thermoelectric efficiency: dynamical models unveil microscopic mechanisms.

Giuliano Benenti1, Giulio Casati

  • 1CNISM, CNR-INFM, and Centre for Nonlinear and Complex Systems, Università degli Studi dell'Insubria, Via Valleggio 11, 22100 Como, Italy. giuliano.benenti@uninsubria.it

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|December 15, 2010
PubMed
Summary

Dynamical nonlinear systems offer a novel approach to enhance thermoelectric machine efficiency. These models reveal physical mechanisms enabling thermoelectric efficiency to approach the theoretical Carnot limit.

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Last Updated: Jun 6, 2026

Fabrication of Bi2Te3 and Sb2Te3 Thermoelectric Thin Films using Radio Frequency Magnetron Sputtering Technique
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Asymmetric Thermoelectrochemical Cell for Harvesting Low-grade Heat under Isothermal Operation
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Area of Science:

  • Physics
  • Thermodynamics
  • Nonlinear Dynamics

Background:

  • The challenge of improving thermoelectric machine efficiency is a long-standing problem in thermodynamics.
  • Dynamical nonlinear systems present a new theoretical framework for addressing this challenge.

Purpose of the Study:

  • To review stylized models of classical dynamics for understanding thermoelectric efficiency.
  • To explore the physical mechanisms behind high thermoelectric efficiency using dynamical models.

Main Methods:

  • Discussion of stylized models of classical dynamics.
  • Analysis of non-interacting complex molecules in an ergodic billiard.
  • Examination of a disordered hard-point gas model.
  • Investigation of an abstract thermoelectric machine model.

Main Results:

  • Dynamical models unveil key physical mechanisms for enhancing thermoelectric efficiency.
  • These mechanisms allow thermoelectric efficiency to approach the Carnot limit.

Conclusions:

  • Dynamical nonlinear systems provide a promising avenue for designing highly efficient thermoelectric machines.
  • The studied models elucidate fundamental principles for achieving near-Carnot efficiency.