Power and efficiency optimization of an irreversible quantum Carnot heat engine working with harmonic oscillators

2020 ◽  
Vol 550 ◽  
pp. 124140 ◽  
Author(s):  
Lingen Chen ◽  
Xiaowei Liu ◽  
Yanlin Ge ◽  
Feng Wu ◽  
Huijun Feng ◽  
...  
Keyword(s):  
Heat Engine ◽  
Harmonic Oscillators ◽  
Efficiency Optimization

scholarly journals Optimal Power and Efficiency of Multi-Stage Endoreversible Quantum Carnot Heat Engine with Harmonic Oscillators at the Classical Limit

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 457 ◽  
Author(s):  
Zewei Meng ◽  
Lingen Chen ◽  
Feng Wu
Keyword(s):  
Classical Limit ◽  
Heat Engine ◽  
Combined Cycle ◽  
Harmonic Oscillators ◽  
Total Power ◽  
Cycle Period ◽  
Carnot Cycle ◽  
Heat Current ◽  
Operating Modes ◽  
Multi Stage

At the classical limit, a multi-stage, endoreversible Carnot cycle model of quantum heat engine (QHE) working with non-interacting harmonic oscillators systems is established in this paper. A simplified combined cycle, where all sub-cycles work at maximum power output (MPO), is analyzed under two types of combined form: constraint of cycle period or constraint of interstage heat current. The expressions of power and the corresponding efficiency under two types of combined constrains are derived. A general combined cycle, in which all sub-cycles run at arbitrary state, is further investigated under two types of combined constrains. By introducing the Lagrangian function, the MPO of two-stage combined QHE with different intermediate temperatures is obtained, utilizing numerical calculation. The results show that, for the simplified combined cycle, the total power decreases and heat exchange from hot reservoir increases under two types of constrains with the increasing number (N) of stages. The efficiency of the combined cycle decreases under the constraints of the cycle period, but keeps constant under the constraint of interstage heat current. For the general combined cycle, three operating modes, including single heat engine mode at low “temperature” (SM1), double heat engine mode (DM) and single heat engine mode at high “temperature” (SM2), appear as intermediate temperature varies. For the constraint of cycle period, the MPO is obtained at the junction of DM mode and SM2 mode. For the constraint of interstage heat current, the MPO keeps constant during DM mode, in which the two sub-cycles compensate each other.

Thermodynamical analysis of a quantum heat engine based on harmonic oscillators

2016 ◽  
Vol 94 (1) ◽  
Author(s):  
Andrea Insinga ◽  
Bjarne Andresen ◽  
Peter Salamon
Keyword(s):  
Heat Engine ◽  
Harmonic Oscillators ◽  
Quantum Heat Engine

Ecological optimization of an irreversible harmonic oscillators Carnot heat engine

2009 ◽  
Vol 52 (12) ◽  
pp. 1976-1988 ◽  
Author(s):  
XiaoWei Liu ◽  
LinGen Chen ◽  
Feng Wu ◽  
FengRui Sun
Keyword(s):  
Heat Engine ◽  
Harmonic Oscillators ◽  
Ecological Optimization

Power and efficiency optimization for an energy selective electron heat engine with double-resonance energy filter

Energy ◽  
2016 ◽  
Vol 107 ◽  
pp. 287-294 ◽  
Author(s):  
Youhong Yu ◽  
Zemin Ding ◽  
Lingen Chen ◽  
Wenhua Wang ◽  
Fengrui Sun
Keyword(s):  
Double Resonance ◽  
Heat Engine ◽  
Resonance Energy ◽  
Efficiency Optimization ◽  
Electron Heat

scholarly journals A dynamic model for the efficiency optimization of an oscillatory low grade heat engine

Energy ◽  
2011 ◽  
Vol 36 (12) ◽  
pp. 6967-6980 ◽  
Author(s):  
Christos N. Markides ◽  
Thomas C.B. Smith
Keyword(s):  
Dynamic Model ◽  
Heat Engine ◽  
Low Grade ◽  
Efficiency Optimization ◽  
Low Grade Heat

Exergetic Efficiency Optimization for an Irreversible Carnot Heat Engine

2007 ◽  
Vol 23 (2) ◽  
pp. 181-186 ◽  
Author(s):  
T.-B. Chang
Keyword(s):  
Analytical Solutions ◽  
Heat Supply ◽  
Optimal Allocation ◽  
Heat Engine ◽  
Thermal Conductance ◽  
Optimization Method ◽  
Thermodynamic Theory ◽  
Exergetic Efficiency ◽  
Supply Rate ◽  
Efficiency Optimization

AbstractIn this paper, an exergetic efficiency optimization method that combines the concept of exergy and finite-time thermodynamic theory is developed to analyze an irreversible heat engine. With the total thermal conductance constraint, the analytical solutions of optimal allocation of thermal conductance and the corresponding maximum exergetic efficiency, thermal efficiency, as well as operating temperatures of hot and cold sides are obtained under a fixed overall heat supply rate. The results show that the exergetic efficiency optimization method can effectively analyze an irreversible heat engine.

How a microscopic bio-heat engine works

Nature India ◽  
2016 ◽  
Keyword(s):  
Heat Engine
Sign in / Sign up

Export Citation Format

Share Document