OPTIMUM PERFORMANCE OF A SPIN-1/2 QUANTUM CARNOT REFRIGERATOR
 
                 
                
                    
                                        
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Graphical Abstract
 
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Abstract
    In this peper, the optimum performance of a spin 1/2 quantum carnot refrigerator is studied. The optimum performance parameters and the optimum relation boween the refrigeration rate and the performeace coefficient for a quantum refrigerator are obtained. The results provide an optimal project for selection of operation situation of a refrigerator.
 
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