Optimization and thermodynamic performance measures for a class of finite time thermodynamic cycles

Computer Science – Performance

Scientific paper

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Carnot Cycle, Cooling, Energy Conversion Efficiency, Refrigerating, Thermodynamic Efficiency, Energy Consumption, Entropy, Heat Flux, High Temperature, Low Temperature, Optimization, Thermodynamics, Working Fluids

Scientific paper

Modifications to the quasistatic Carnot cycle are developed in order to formulate improved theoretical bounds on the thermal efficiency of certain refrigeration cycles that produce finite cooling power. The modified refrigeration cycle is based on the idealized endoreversible finite time cycle. Two of the four cycle branches are reversible adiabats, and the other two are the high and low temperature branches along which finite heat fluxes couple the refrigeration cycle with external heat reservoirs. This finite time model was used to obtain the following results: (1) The performance of a finite time Carnot refrigeration cycle (FTCRC) is examined; (2) A finite time refrigeration cycle (FTRC) is optimized to obtain four distinct optimal cycling modes that maximize efficiency and cooling power, and minimize power consumption and irreversible entropy production; and (3) The problem of imperfect heat switches linking the working fluid of an FTRC to external heat reservoirs is studied. The maximum efficiency cycling mode is obtained by numerically optimizing the FTRC. Two distinct optimum cycling conditions exist: operation at the global maximum in efficiency; and operation at the frequency of maximum cooling power.

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