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Related Concept Videos

Refrigerators and Heat Pumps01:07

Refrigerators and Heat Pumps

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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.
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Third Law of Thermodynamics02:38

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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Experimentally, if object A is in equilibrium with object B, and object B is in equilibrium with object C, then object A is in equilibrium with object C. That statement of transitivity is called the "zeroth law of thermodynamics." For example, a cold metal block and a hot metal block are both placed on a metal plate at room temperature. Eventually, the cold block and the plate will be in thermal equilibrium. In addition, the hot block and the plate will be in thermal equilibrium.
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Related Experiment Video

Updated: Apr 10, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Four-level refrigerator driven by photons.

Jianhui Wang1,2,3, Yiming Lai1, Zhuolin Ye1

  • 1Department of Physics, Nanchang University, Nanchang 330031, China.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 13, 2015
PubMed
Summary
This summary is machine-generated.

We developed a photon-driven quantum absorption refrigerator using a four-level system. It efficiently cools by coupling to solar, hot, and cold reservoirs, optimizing performance under tight coupling for thermodynamic consistency.

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Area of Science:

  • Quantum thermodynamics
  • Thermodynamic devices
  • Photonics

Background:

  • Quantum absorption refrigerators offer advanced cooling technologies.
  • Harnessing photon energy for refrigeration is an emerging field.
  • Thermodynamic performance optimization is crucial for practical applications.

Purpose of the Study:

  • To propose and analyze a novel quantum absorption refrigerator driven by photons.
  • To derive expressions for cooling power and coefficient of performance.
  • To investigate the optimal operating conditions and thermodynamic consistency.

Main Methods:

  • Utilizing a four-level quantum system as the working substance.
  • Simultaneously coupling the system to hot, cold, and solar heat reservoirs.
  • Deriving analytical expressions for cooling power and coefficient of performance.

Main Results:

  • Explicit formulas for cooling power and coefficient of performance were obtained.
  • The model demonstrates highest efficiency under tight coupling conditions.
  • The refrigerator's performance is consistent with the third law of thermodynamics as temperature approaches zero.

Conclusions:

  • Photon-driven quantum absorption refrigerators are feasible.
  • Tight coupling is essential for maximizing the efficiency of such devices.
  • The proposed model provides a theoretical foundation for advanced quantum cooling systems.