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Related Concept Videos

Heat Engines01:10

Heat Engines

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A heat engine is a device used to extract heat from a source and then convert it into mechanical work used for various applications. For example, a steam engine on an old-style train can produce the work needed for driving the train.
Whenever we consider heat engines (and associated devices such as refrigerators and heat pumps), we do not use the standard sign convention for heat and work. For convenience, we assume that the symbols Qh, Qc, and W represent only the amounts of heat transferred...
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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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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 Carnot Cycle01:30

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Converting work to heat is an irreversible process, and the purpose of a heat engine is to reverse the effect partially. Heat engines aim to increase the efficiency of the reversal, that is, maximize the work retrieved from heat. If the efficiency of a heat engine were 100%, it would imply reversing the process completely without introducing any other effect. Thus, it would violate the second law of thermodynamics.
What could be the theoretical limit to the efficiency of a heat engine? The...
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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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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Experimental Characterization of a Spin Quantum Heat Engine.

John P S Peterson1, Tiago B Batalhão2,3,4, Marcela Herrera2

  • 1Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo N2L 3G1, Ontario, Canada.

Physical Review Letters
|January 11, 2020
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Researchers built a quantum heat engine using spin-1/2 systems and nuclear magnetic resonance. This engine operates near its theoretical efficiency limit, demonstrating the role of energy fluctuations in quantum thermodynamics.

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Area of Science:

  • Thermodynamics
  • Quantum Mechanics
  • Statistical Mechanics

Background:

  • The study of thermodynamics in small quantum systems is an emerging field.
  • Energy fluctuations are crucial for understanding irreversibility in nonclassical thermal machines.
  • Quantum effects become significant at microscopic scales, necessitating new theoretical and experimental approaches.

Purpose of the Study:

  • To experimentally implement and characterize a quantum heat engine.
  • To investigate the role of energy fluctuations in microscopic irreversibility.
  • To explore the efficiency lag and entropy production at finite times in quantum engines.

Main Methods:

  • Experimental implementation of a quantum heat engine using a spin-1/2 system.
  • Utilizing nuclear magnetic resonance (NMR) techniques for control and measurement.
  • Assessing energy fluctuations to characterize irreversibility at the microscopic level.
  • Investigating quantum Otto cycles at maximum power.

Main Results:

  • A proof-of-concept quantum heat engine was successfully implemented.
  • The engine's irreversibility was fully characterized by analyzing energy fluctuations in work and heat flows.
  • The engine operates in a regime where both thermal and quantum fluctuations are relevant.
  • The quantum heat engine achieved an efficiency of approximately 42%, closely approaching the thermodynamic limit of 44%.

Conclusions:

  • Experimental demonstration of a quantum heat engine operating with significant quantum effects.
  • Validation of the importance of energy fluctuations for describing irreversibility in quantum systems.
  • The developed quantum engine shows potential for high efficiency, nearing theoretical limits, even at maximum power operation.