Engineering Thermodynamics
If a system after undergoing a series of processes, returns to the initial state then

Process is thermodynamically in equilibrium
Process is executed in closed system cycle
Sum of heat and work transfer will be zero
Its entropy will change due to irreversibility

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

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

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