What are the mechanisms of energy transfer in an open system?

mechanism of energy transfer in system is depend on Heat and Work:

Explanation:

Heat : Heat is described as the type of energy transmitted by a temperature difference between two structures (or a system and its environment).

Work:it is is an interaction of energy between a system and its environment. In the form of work it can cross the boundaries of a closed system. if energy crossing boundary of the system is not heat then it must be work ...