An analytical formula for the estimation of a rankine-cycle heat engine efficiency at maximum power

1991 ◽  
Vol 15 (3) ◽  
pp. 149-159 ◽  
Author(s):  
Won-Yong Lee ◽  
Sang-Soo Kim
Keyword(s):  
Heat Engine ◽  
Analytical Formula ◽  
Rankine Cycle ◽  
Maximum Power ◽  
Engine Efficiency

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.

Thermodynamics of James Watt – Ignored or not Understood?

2021 ◽  
Vol 42 (3) ◽  
pp. 397
Author(s):  
Jovan Mitrovic
Keyword(s):  
Latent Heat ◽  
Heat Engine ◽  
Primary Source ◽  
Rankine Cycle ◽  
Theoretical Work ◽  
Steam Pressure ◽  
Steam Engine ◽  
Saturated Steam ◽  
Maximum Efficiency ◽  
Starting Point

In the analysis of the development of thermodynamics as a science, the theoretical work of Sadi Carnot, published in 1824, is generally considered to be the starting point. Carnot studied the cycle of an ideal heat engine and formulated the condition for its maximum efficiency. In this article we examine James Watt’s contributions to the formation of fundamental concepts of thermodynamics, made in the course of his work on improving the Newcomen engine and developing his own steam engine. It is shown that Watt was the first to characterize thermodynamic properties such as latent heat and vapor density. The authors prove Watt’s priority in the studies of the dependence of saturated steam pressure on temperature, in which a critical point was found when the latent heat disappears. These results of Watt anticipated by many decades the studies on the thermodynamic critical state by Th. Andrews and J. Thomson. The article also discusses Wattʼs research on thermodynamic cycles. It is shown that he was the first to study the Rankine cycle with superheated steam, known from the history of thermodynamics. Watt was also the first scientist to introduce the concept of a steam engine’ volumetric work as the product of pressure and volume, and developed a device, the steam pressure indicator, to measure its value. We show the results obtained by Watt with steam to be considerably ahead of Prescott Jouleʼs work on the cooling and condensation of gases during expansion. The article presents an interpretation of Watt’s 1769 patent that is very important as the primary source for a subsequent study and establishment of the principles of energy conversion. The factual material presented in this article suggests that Watt’s scientific research have not been properly understood or simply went unnoticed.

Encoding a Model-Based Display with Dynamic Data

2000 ◽  
Vol 44 (22) ◽  
pp. 579-582 ◽  
Author(s):  
Leo Beltracchi
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Analytical Data ◽  
Heat Engine ◽  
Rankine Cycle ◽  
Direct Perception ◽  
Dynamic Data ◽  
Model Based ◽  
Heat Engine Cycle ◽  
Engine Cycle

A model-based display of the heat engine cycle for a nuclear power plant is defined and illustrated in terms of the thermodynamic first principles used to design the plant. The model-based display is a modified Rankine Cycle, the basic heat engine cycle for power plants. The display is made from measured process variables and the properties of water and presented on a CRT in iconic form, thereby providing a direct perception of the process. This structure of display design is an example of Rasmussen's means-ends hierarchy; starting with the abstract and ending with the specific display. Encoding the display with dynamic data aids operators in monitoring and interpreting the plant during transients and disturbances. Analytical data on the TMI-2 accident is used to illustrate the dynamic coding of the model-based display. The concepts discussed and illustrated are applicable to fossil and nuclear power plants and to other process industries.

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