Engineering Thermodynamics
A definite area or a space where some thermodynamic process takes place is known as

Thermodynamic system
Thermodynamic law
Thermodynamic process
Thermodynamic cycle

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Engineering Thermodynamics
According to Clausius statement of second law of thermodynamics

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

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