media archive
Physics Conferences 7th KIAS Conference on Statistical Physics
Loading the player ...
[Talk 12] Efficiency at the maximum power output for simple two-level heat engine
SPEAKER  |  Sang Hoon Lee
INSTITUTE  |  KIAS
DATE  |  July 5(Tue), 2016
TIME  |  11:40
PLACE  |  Korea Institute for Advanced Study (KIAS), Seoul, Korea
Keyword  |  
Download  |  
ABSTRACT  |  We introduce a simple two-level heat engine to study the efficiency in the condition of the maximum power output, depending on the energy levels from which the net work is extracted. In contrast to the quasi-statically operated Carnot engine whose efficiency reaches the theoretical maximum, recent research on more realistic engines operated in finite time has revealed other classes of efficiency such as the Curzon-Ahlborn efficiency maximizing the power output. We investigate yet another side with our heat engine model, which involves the population difference caused by different transition rates. Due to the nature of our model, the explicitly time-dependent part is completely decoupled from the other terms in the generated work and the efficiency is independent of the operating time, which allows us to analyze the dependence on other system variables that are the transition rates, or implicit time dependence in this case. We provide the optimal combination of transition rates maximizing the generated power output and discuss its implication on general premise of realistic heat engines. In particular, we prove that the engine efficiency of our model for maximum power output is clearly different from the Curzon-Ahlborn efficiency in spite of its endoreversibility (possibly because of the nonlinear heat conduction), although they share the universal linear and quadratic coefficients at the near-equilibrium limit with similar values of transition rates.
  • [Talk 22] Pressure i...
    Yariv Kafri
    July 7(Thu), 2016
  • [Talk 24] Exact stat...
    Gregory Schehr
    July 7(Thu), 2016
  • [Talk 26] Noninterse...
    Dong Wang
    July 7(Thu), 2016
  • [Talk 23] Phase equi...
    Julien Tailleur
    July 7(Thu), 2016
  • [Talk 27] Height dis...
    Satya N. Majumdar
    July 7(Thu), 2016
  • [Talk 17] Adaptive w...
    Joachim Krug
    July 6(Wed), 2016
  • [Talk 18] Evolution ...
    Hyeong-Chai Jeong
    July 6(Wed), 2016
  • [Talk 20] Scaling co...
    S. H. Ebrahimnazhad Rahbari
    July 6(Wed), 2016
  • [Talk 11] The Gibbs ...
    Yuto Murashita
    July 5(Tue), 2016
  • [Talk 16] Probabilit...
    Eunghyun Lee
    July 5(Tue), 2016
  • [Talk 15] Role of Bi...
    Meesoon Ha
    July 5(Tue), 2016
  • [Talk 8] Does the tr...
    Masaki Sano
    July 5(Tue), 2016
  • [Talk 12] Efficiency...
    Sang Hoon Lee
    July 5(Tue), 2016
  • [Talk 9] Reconstruct...
    Pik-Yin Lai
    July 5(Tue), 2016
  • [Talk 14] Irreversib...
    Erick Lutz
    July 5(Tue), 2016
  • [Talk 5] A non-equil...
    Julian Lee
    July 4(Mon), 2016
  • [Talk 4] Dynamical s...
    Yongjoo Baek
    July 4(Mon), 2016
  • [Talk 6] Nonequilibr...
    Leihan Tang
    July 4(Mon), 2016
  • [Talk 7] Universalit...
    Wonmuk Hwang
    July 4(Mon), 2016
  • [Talk 1] Thermodynam...
    Shin-ichi Sasa
    July 4(Mon), 2016
  • [Talk 2] Fluctuation...
    Sanjib Sabhapandit
    July 4(Mon), 2016