Types of Thermodynamic Systems

1 Isolated System
In isolated system no energy or mass cross the boundary of the system. In other words no energy transfer of mass transfer takes place across the boundary.

Example 1: Thermos flask. Since there is no heat exchange with the surroundings and no mass transfers also happening it can be taken as an isolated system.

Example 2: Universe as a total is taken as isolated system.

2 Closed System
In a closed system only energy transfer takes place across the boundary of the system. The boundary of closed system may change. But there will not be any mass flow across the boundary.

Example 1: A coolant system of an automobile can be considered as a closed system.

Example 2: A pressure cooker can also be considered as a closed system because there is no transfer of mass while cooking is happening. Only energy exchanges take place.

3 Open System
In an open system both energy and mass transfer takes place across the boundary of the system.

Example 1: Water flow through the pipes.

Example 2: Jet engines.

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