Reply to “Comment on ‘Not all counterclockwise thermodynamic cycles are refrigerators’” [Am. J. Phys. <b>85</b>, 861–863 (2017)]

Dickerson, R. H.; Mottmann, J.

doi:10.1119/1.5005929

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…the gas begins with the same temperature and maintains that temperature throughout the change of volume. In the purist view, there is no need for a reservoir at a temperature different from T. This is in stark contrast with [13] where the authors write regarding a quasistatic volume change, using the utilitarian view, that 'A temperature difference, even if infinitesimal, is always mandatory if there is to be any heat exchange.' Table 1 provides a capsule summary of important elements of the two views.…”

Section: Isothermal Volume Change: the Purist Viewmentioning

confidence: 95%

Isothermal heating: purist and utilitarian views

Leff¹,

Mungan²

2018

Eur. J. Phys.

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The common thermodynamics example of reversible isothermal heating at temperature T requires the gas to maintain contact with a constant temperature reservoir at the same temperature as the gas. This is inconsistent with the often used view that heat is an energy transfer from higher to lower temperature. We discuss two ways to deal with this dichotomy, using what we call purist and utilitarian views, emphasizing the roles of language and logic in each. We suggest a way for teachers to address this issue in the classroom, and end with a review of related challenges to physics teachers associated with the terms heat and heating.

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Section: Isothermal Volume Change: the Purist Viewmentioning

confidence: 95%

Isothermal heating: purist and utilitarian views

Leff¹,

Mungan²

2018

Eur. J. Phys.

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“…The present authors have shown [1] that clockwise (CW) Stirling cycles, even if reversible, have efficiencies (ε) that are strictly less than that of an ideal Carnot cycle, ε Stirling < ε Carnot . We have also published 'Not all counterclockwise thermodynamic cycles are refrigerators' [2,3], which showed that counterclockwise (CCW) Stirling cycles could not act as refrigerators. Recently, Professor Mungan described [4] a reversible CCW Stirling cycle with the claim that it is a refrigerator and has a coefficient of performance (COP) equal to an ideal Carnot refrigerator.…”

Section: Introductionmentioning

confidence: 99%

Comment on ‘Coefficient of performance of Stirling refrigerators’

Dickerson¹,

Mottmann²

2020

Eur. J. Phys.

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Exploring counterclockwise thermodynamic cycles

Knight

2024

American Journal of Physics

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A common belief is that any closed, counterclockwise cycle on a pV diagram represents a refrigerator or heat pump. It has been established that this is not the case, but previous papers on this topic have made unnecessary assumptions about the temperatures of the energy reservoirs and about how the system exchanges energy with the reservoirs. Relaxing these assumptions leads to a wide array of unexpected behaviors. In some cases, the same pV cycle can be a heat pump, a cold pump, or a Joule pump simply by changing how the system is connected to the reservoirs. This paper explores the strange world of counterclockwise cycles.

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Reply to “Comment on ‘Not all counterclockwise thermodynamic cycles are refrigerators’” [Am. J. Phys. 85, 861–863 (2017)]

Cited by 3 publications

References 3 publications

Isothermal heating: purist and utilitarian views

Isothermal heating: purist and utilitarian views

Comment on ‘Coefficient of performance of Stirling refrigerators’

Exploring counterclockwise thermodynamic cycles

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