Numerically "exact" simulations of a quantum Carnot cycle: Analysis using thermodynamic work diagrams [PDF]
Journal of Chemical Physics, 2022 We investigate the efficiency of a quantum Carnot engine based on open quantum dynamics theory. The model includes time-dependent external fields for the subsystems controlling the isothermal and isentropic processes and for the system-bath (SB ...
Shoki Koyanagi, Yoshitaka Tanimura
semanticscholar +5 more sources
Optimal Heat Exchanger Area Distribution and Low-Temperature Heat Sink Temperature for Power Optimization of an Endoreversible Space Carnot Cycle. [PDF]
Entropy (Basel), 2021 Using finite-time thermodynamics, a model of an endoreversible Carnot cycle for a space power plant is established in this paper. The expressions of the cycle power output and thermal efficiency are derived.
Wang T, Ge Y, Chen L, Feng H, Yu J.
europepmc +2 more sources
Economic Cycles of Carnot Type [PDF]
Entropy, 2021 Originally, the Carnot cycle was a theoretical thermodynamic cycle that provided an upper limit on the efficiency that any classical thermodynamic engine can achieve during the conversion of heat into work, or conversely, the efficiency of a ...
Constantin Udriste +2 more
doaj +4 more sources
Maximum power, ecological function and efficiency of an irreversible Carnot cycle. A cost and effectiveness optimization [PDF]
, 2007 In this work we include, for the Carnot cycle, irreversibilities of linear finite rate of heat transferences between the heat engine and its reservoirs, heat leak between the reservoirs and internal dissipations of the working fluid. A first optimization
Aragon-Gonzalez, G +3 more
core +5 more sources
Quantum thermodynamic Carnot and Otto-like cycles for a two-level system [PDF]
, 2007 From the thermodynamic equilibrium properties of a two-level system with variable energy-level gap $\Delta$, and a careful distinction between the Gibbs relation $dE = T dS + (E/\Delta) d\Delta$ and the energy balance equation $dE = \delta Q^\leftarrow -
Allahverdyan A. E. +5 more
core +4 more sources
Quantum Carnot cycle with inner friction [PDF]
Quantum Information Processing, 2020 A single driven spin is investigated as the working substance of a six-stroke irreversible quantum Carnot cycle. The role of inner friction associated with the finite-time adiabatic transformations on the cycle efficiency and the harvested work are ...
Selçuk Çakmak, Ferdi Altintas
semanticscholar +4 more sources
Hierarchical equations of motion for multiple baths (HEOM-MB) and their application to Carnot cycle [PDF]
Journal of Chemical PhysicsWe have developed a computer code for the thermodynamic hierarchical equations of motion derived from a spin subsystem coupled to multiple Drude baths at different temperatures, which are connected to or disconnected from the subsystem as a function of ...
Shoki Koyanagi, Yoshitaka Tanimura
semanticscholar +4 more sources
Carnot Theorem Revisited: A Critical Perspective [PDF]
EntropyAfter a brief review of Carnot’s everlasting contributions to the foundations of thermodynamics, we critically examine the consequences of the Carnot theorem, which leaves behind some lingering questions and confusion that persist even today. What is the
P. D. Gujrati
doaj +2 more sources
OTEC Maximum Net Power Output Using Carnot Cycle and Application to Simplify Heat Exchanger Selection [PDF]
Entropy (Basel), 2019 Ocean thermal energy conversion (OTEC) uses the natural thermal gradient in the sea. It has been investigated to make it competitive with conventional power plants, as it has huge potential and can produce energy steadily throughout the year.
Fontaine K, Yasunaga T, Ikegami Y.
europepmc +2 more sources
A reassessment of the Carnot cycle and the concept of entropy [PDF]
Nature Precedings, 2008 AbstractIt is argued that the Carnot cycle is a highly inaccurate representation of a steam engine, and that the net work obtained in its operation would be zero. This conclusion is also supported by an elementary mathematical approach, which re-examines the work done in the four individual steps of the cycle.
Sosale Chandrasekhar
openalex +4 more sources