Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Heat is supplied to water at temperature below the maximum temperature of the cycle
Carnot cycle can't work with saturated steam
Rankine cycle is hypothetical
A Rankine cycle receives heat at two places

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
Heat can
Heat can
Heat can be transferred from low temperature to high temperature source if COP of process is more than unity

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