The power of a critical heat engine
| Autor: | Rosario Fazio, Michele Campisi |
|---|---|
| Přispěvatelé: | Campisi, Michele, Fazio, Rosario |
| Rok vydání: | 2016 |
| Předmět: |
Thermal efficiency
Computer science Science media_common.quotation_subject General Physics and Astronomy FOS: Physical sciences Second law of thermodynamics 01 natural sciences 7. Clean energy General Biochemistry Genetics and Molecular Biology Article 010305 fluids & plasmas symbols.namesake Theoretical physics 0103 physical sciences Statistical physics 010306 general physics Condensed Matter - Statistical Mechanics Heat engine media_common Multidisciplinary Statistical Mechanics (cond-mat.stat-mech) Kelvin–Planck statement General Chemistry Power (physics) CRITICAL SPEEDING-UP SCALING THEORY ICE symbols Exergy efficiency Chemistry (all) Biochemistry Genetics and Molecular Biology (all) Physics and Astronomy (all) Carnot cycle Carnot heat engine |
| Zdroj: | Nature Communications Nature communications 7 (2016). doi:10.1038/ncomms11895 info:cnr-pdr/source/autori:M. Campisi and R. Fazio/titolo:The power of a critical heat engine/doi:10.1038%2Fncomms11895/rivista:Nature communications/anno:2016/pagina_da:/pagina_a:/intervallo_pagine:/volume:7 Nature Communications, Vol 7, Iss 1, Pp 1-5 (2016) |
| ISSN: | 2041-1723 |
| Popis: | Since its inception about two centuries ago thermodynamics has sparkled continuous interest and fundamental questions. According to the second law no heat engine can have an efficiency larger than Carnot's efficiency. The latter can be achieved by the Carnot engine, which however ideally operates in infinite time, hence delivers null power. A currently open question is whether the Carnot efficiency can be achieved at finite power. Most of the previous works addressed this question within the Onsager matrix formalism of linear response theory. Here we pursue a different route based on finite-size-scaling theory. We focus on quantum Otto engines and show that when the working substance is at the verge of a second order phase transition diverging energy fluctuations can enable approaching the Carnot point without sacrificing power. The rate of such approach is dictated by the critical indices, thus showing the universal character of our analysis. Comment: 5 pages, 4 figures. This paper resulted from extensive rewriting and splitting in two of arXiv:1510.06183, now withdrawn. v2 published version |
| Databáze: | OpenAIRE |
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