▀Clausius Statement of second law:
It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a system at low temperature to another system at high temperature.
Clausius statement points-out the essence of work input required in Refrigerators & Heat pumps
Fig
Heat can’t flow from low temperature to high temperature systems.
COP=Q/W=Q/0=∞.............(impossible)
It is impossible to construct a refrigerator, which operates without an input of work.
Fig
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