Journal
PHYSICAL REVIEW E
Volume 89, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.89.042128
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Funding
- COST Action [MP1006]
- Canary Islands Government through the ACIISI (European Social Fund)
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It is well known that heat pumps, while being all limited by the same basic thermodynamic laws, may find realization on systems as small and quantum as a three-level maser. In order to quantitatively assess how the performance of these devices scales with their size, we design generalized N-dimensional ideal heat pumps by merging N - 2 elementary three-level stages. We set them to operate in the absorption chiller mode between given hot and cold baths and study their maximum achievable cooling power and the corresponding efficiency as a function of N. While the efficiency at maximum power is roughly size-independent, the power itself slightly increases with the dimension, quickly saturating to a constant. Thus, interestingly, scaling up autonomous quantum heat pumps does not render a significant enhancement beyond the optimal double-stage configuration.
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