Mass and Energy Balances

Chapter 4

Mass and Energy Balances

In this chapter we will apply the conservation of mass and conservation of energy laws to open systems or control volumes of interest. The balances will be applied to steady and unsteady system such as tanks, turbines, pumps, and compressors.

4.1 Conservation of Mass

The general balance equation can be written as
Accumulation = Input + Generation – Output – Consumption
The terms (Generation – Consumption) are usually combined to call Generation with positive value for net generation and negative value for net consumption.


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