scholarly journals Nonuniversality of heat-engine efficiency at maximum power

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
Sang Hoon Lee ◽  
Jaegon Um ◽  
Hyunggyu Park
Keyword(s):  
Heat Engine ◽  
Maximum Power ◽  
Engine Efficiency

Well-Informed Heat Engine: Efficiency and Maximum Power

1960 ◽  
Vol 28 (4) ◽  
pp. 324-326 ◽  
Author(s):  
C. Finfgeld ◽  
S. Machlup
Keyword(s):  
Heat Engine ◽  
Maximum Power ◽  
Engine Efficiency

scholarly journals H. B. Reitlinger and the origins of the efficiency at maximum power formula for heat engines

2014 ◽  
Vol 39 (4) ◽  
Author(s):  
Alexandre Vaudrey ◽  
François Lanzetta ◽  
Michel Feidt
Keyword(s):  
Heat Engine ◽  
Maximum Power ◽  
Historical Study ◽  
Engine Efficiency ◽  
Heat Engines ◽  
Long Time ◽  
History Of ◽  
Seminal Article

AbstractEven if not so ancient, the history of the heat engine efficiency at maximum power expression has been yet turbulent. More than a decade after the publication of the seminal article by Curzon and Ahlborn in 1975, two older works by Chambadal and Novikov were rediscovered, both dating from 1957. Then, some years ago, the name of Yvon arose from a textual reference to this famous relation in a conference article published in 1955. Thanks to a historical study of French-written books not published for a long time, and since never translated into other languages, we bring to light in this paper that this relation was actually first proposed by Henri B. Reitlinger in 1929.

Effects of superpositions of quantum states on quantum isoenergetic cycles: Efficiency and maximum power output

2015 ◽  
Vol 29 (14) ◽  
pp. 1550086 ◽  
Author(s):  
X. Y. Niu ◽  
X. L. Huang ◽  
Y. F. Shang ◽  
X. Y. Wang
Keyword(s):  
Power Output ◽  
Superposition Principle ◽  
Heat Engine ◽  
Engine Performance ◽  
Quantum States ◽  
Maximum Power ◽  
Or Efficiency ◽  
Engine Efficiency ◽  
Maximum Power Output ◽  
Fixed Power

Superposition principle plays a crucial role in quantum mechanics, thus its effects on thermodynamics is an interesting topic. Here, the effects of superpositions of quantum states on isoenergetic cycle are studied. We find superposition can improve the heat engine efficiency and release the positive work condition in general case. In the finite time process, we find the efficiency at maximum power output in superposition case is lower than the nonsuperposition case. This efficiency depends on one index of the energy spectrum of the working substance. This result does not mean the superposition discourages the heat engine performance. For fixed efficiency or fixed power, the superposition improves the power or efficiency respectively. These results show how quantum mechanical properties affect the thermodynamical cycle.

scholarly journals Hayward black hole heat engine efficiency in anti-de Sitter space

2021 ◽  
pp. 2150108
Author(s):  
Sen Guo ◽  
Ya Ling Huang ◽  
Ke Jiang He ◽  
Guo Ping Li
Keyword(s):  
Black Hole ◽  
Phase Space ◽  
Magnetic Charge ◽  
Heat Engine ◽  
Extended Phase Space ◽  
De Sitter ◽  
Extended Phase ◽  
Regular Black Hole ◽  
Engine Efficiency ◽  
Thermodynamic Pressure

In this paper, we attempt to further study the heat engine efficiency for the regular black hole (BH) with an anti-de Sitter (AdS) background where the working material is the Hayward–AdS (HAdS) BH. In the extended phase space, we investigate the heat engine efficiency of the HAdS BH by defining the cosmological constant as the thermodynamic pressure P and deriving the mechanical work from the PdV terms. Then, we obtain the relation between the efficiency and the entropy/pressure and plot these function figures. Meanwhile, we compare the relation between the HAdS BH with that of the Bardeen–AdS (BAdS) BH, where it is found that the efficiency of the HAdS BH increases with increase in the magnetic charge q in contrast to that of the BAdS BH decrease with increase in the magnetic charge q. We found that the HAdS BH is more efficient than the BAdS BH, and guess that it is related to the BH structure.

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