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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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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.
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The Carnot Cycle and the Second Law of Thermodynamics01:20

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The Carnot engine works between two heat reservoirs of fixed temperatures. The Carnot cycle begs the following question: Is it possible to devise a heat engine that is more efficient than a Carnot engine between two fixed temperatures? The answer lies in designing a Carnot refrigerator.
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Statements of the Second Law of Thermodynamics01:15

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The second law of thermodynamics can be stated in several different ways, and all of them can be shown to imply the others. The Clausius’ statement of the second law of thermodynamics is based on the irreversibility of spontaneous heat flow. It states that heat will not flow from the colder body to the hotter body unless some other process is involved. Additionally, as per the Kelvin’s statement, it is impossible to convert the heat from a single source into work without any other...
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Refrigerators and Heat Pumps01:07

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Refrigerators or heat pumps are heat engines operating in a reverse direction. For a refrigerator, the focus is on removing heat from a specific area, whereas, for a heat pump, the focus is on dumping heat into one particular area. A refrigerator (or heat pump) absorbs heat Qc from the cold reservoir at Kelvin temperature Tc and discards heat Qh to the hot reservoir at Kelvin temperature Th, while work W is done on the engine’s working substance.
A household refrigerator removes heat from...
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Mechanisms of Heat Transfer II01:20

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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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Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Quantum-Enhanced Heat Engine Based on Superabsorption.

Shunsuke Kamimura1,2, Hideaki Hakoshima1,3, Yuichiro Matsuzaki1

  • 1Research Center for Emerging Computing Technologies, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan.

Physical Review Letters
|May 20, 2022
PubMed
Summary
This summary is machine-generated.

We introduce a quantum heat engine utilizing entanglement for superabsorption. This quantum heat engine achieves a quadratic power scaling (P=Θ(N²)), significantly outperforming classical engines.

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Area of Science:

  • Quantum physics
  • Thermodynamics
  • Quantum information science

Background:

  • Conventional heat engines rely on separable qubits, limiting power scaling.
  • Understanding quantum properties for enhanced thermodynamic performance is crucial.

Purpose of the Study:

  • To propose a quantum-enhanced heat engine leveraging entanglement.
  • To demonstrate the principle of superabsorption for improved energy capture.

Main Methods:

  • Utilizing entangled qubits within a quantum heat engine framework.
  • Analyzing the power output scaling based on quantum properties.

Main Results:

  • The proposed engine exhibits superabsorption, enhancing energy absorption by entangled qubits.
  • Achieved a quantum power scaling of P=Θ(N²), surpassing classical N-qubit engines (P=Θ(N)).
  • Demonstrated superior performance compared to classical N-particle Langevin systems.

Conclusions:

  • Entanglement and superabsorption are key quantum properties for enhancing heat engine performance.
  • The quantum heat engine design offers a significant power scaling advantage.
  • This work provides insights into harnessing quantum mechanics for efficient energy conversion.