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- W2024484884 abstract "A two-level atomic system as a working substance is used to set up a refrigerator consisting of two quantum adiabatic and two isochoric processes (two constant-frequency processes ${ensuremath{omega}}_{a}$ and ${ensuremath{omega}}_{b}$ with ${ensuremath{omega}}_{a}<{ensuremath{omega}}_{b})$, during which the two-level system is in contact with two heat reservoirs at temperatures ${T}_{h}$ and ${T}_{c}(<{T}_{h})$. Considering finite-time operation of two isochoric processes, we derive analytical expressions for cooling rate $R$ and coefficient of performance (COP) $ensuremath{varepsilon}$. The COP at maximum $ensuremath{chi}(=ensuremath{varepsilon}R)$ figure of merit is numerically determined, and it is proved to be in nice agreement with the so-called Curzon and Ahlborn COP ${ensuremath{varepsilon}}_{text{CA}}=sqrt{1+{ensuremath{varepsilon}}_{C}}ensuremath{-}1$, where ${ensuremath{varepsilon}}_{C}={T}_{c}/({T}_{h}ensuremath{-}{T}_{c})$ is the Carnot COP. In the high-temperature limit, the COP at maximum $ensuremath{chi}$ figure of merit, ${ensuremath{varepsilon}}^{*}$, can be expressed analytically by ${ensuremath{varepsilon}}^{*}={ensuremath{varepsilon}}_{+}ensuremath{equiv}(sqrt{9+8{ensuremath{varepsilon}}_{C}}ensuremath{-}3)/2$, which was derived previously as the upper bound of optimal COP for the low-dissipation or minimally nonlinear irreversible refrigerators. Within the context of irreversible thermodynamics, we prove that the value of ${ensuremath{varepsilon}}_{+}$ is also the upper bound of COP at maximum $ensuremath{chi}$ figure of merit when we regard our model as a linear irreversible refrigerator." @default.
- W2024484884 created "2016-06-24" @default.
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- W2024484884 date "2014-11-25" @default.
- W2024484884 modified "2023-10-17" @default.
- W2024484884 title "Coefficient of performance under maximum<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>χ</mml:mi></mml:math>criterion in a two-level atomic system as a refrigerator" @default.
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- W2024484884 doi "https://doi.org/10.1103/physreve.90.052151" @default.
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