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Reversible Heat Engines: Bounds on Estimated Efficiency from Inference

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Abstract

We consider work extraction from two finite reservoirs with constant heat capacity, when the thermodynamic coordinates of the process are not fully specified, i.e., are described by probabilities only. Incomplete information refers to both the specific value of the temperature as well as the label of the reservoir to which it is assigned. Based on the concept of inference, we characterize the reduced performance resulting from this lack of control. Indeed, the estimates for the average efficiency reveal that uncertainty regarding the exact labels reduces the maximal expected efficiency below the Carnot value (\(\eta _\mathrm{C}\)), its minimum value reproducing the well known Curzon–Ahlborn value: \(1-\sqrt{1-\eta _\mathrm{C}}\). We also estimate the efficiency before the value of the temperature is revealed. It is found that if the labels are known with certainty, then in the near-equilibrium limit the efficiency scales as \(\eta _\mathrm{C}/2\), while if there is maximal uncertainty in the labels, then the average estimate for efficiency drops to \(\eta _\mathrm{C}/3\). We also suggest how the inferred properties of the incomplete model can be mapped onto a model with complete information but with an additional source of thermodynamic irreversibility.

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Authors and Affiliations

  1. Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli, 140306, India

    Ramandeep S. Johal

  2. Department of Applied Sciences, University Institute of Engineering and Technology, Panjab University, Chandigarh, 160014, India

    Renuka Rai

  3. 1. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57 IV, 70550, Stuttgart, Germany

    Günter Mahler

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  1. Ramandeep S. Johal
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  2. Renuka Rai
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  3. Günter Mahler
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Correspondence to Ramandeep S. Johal.

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Johal, R.S., Rai, R. & Mahler, G. Reversible Heat Engines: Bounds on Estimated Efficiency from Inference. Found Phys 45, 158–170 (2015). https://doi.org/10.1007/s10701-014-9856-3

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