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DJJ20063- Thermodynamics 1
SURROUNDINGS
SYSTEM
BOUNDARY
Fig. 1.4-2 A closed system with a moving boundary
An open system, or a control volume, as it is often called, is a properly selected region in
space. It usually encloses a device, which involves mass flow such as a boiler, compressor,
turbine or nozzle. Flow through these devices is best studied by selecting the region
within the device as the control volume.
Both mass and energy can cross the boundary of a control volume, as shown in Fig. 2.1-
3.
Fluid Inlet SURROUNDINGS
QOUT
SYSTEM
WOUT
BOUNDARY
Fluid Outlet
Fig 1.4-3 Open system in boiler
8 | P a g e
