Abstract
A finite-time thermodynamics analysis is used to investigate the optimal coefficient of performance (COP) of an irreversible Carnot refrigerator using the per-unit-time COP as an objective function for optimization. The model includes finite-rate heat transfers between the refrigerant and the external heat reservoirs, heat leak between heat reservoirs, and internal dissipations of the refrigerant. Heat conductances associated with heat transfers are optimized by maximizing the cooling power per unit of capital invested in the refrigerator. The obtained results are consistent with performance data for real low-temperature refrigerators.
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