# Thermodynamics: Control Volumes

Unlike closed systems, control volumes can have fluid flowing through them. This is an additional energy that needs to be considered. To consider the energy of the fluid stream you would need to know what the mass flow rate of the fluid is. To calculate the mass flow rate you would use equation 1.

(1)

ρ = density

A = cross-sectional area

v = velocity

Once you know what the mass flow rate you can calculate the energy of the fluid stream over time. In other words you are calculating the power of the fluid stream. Refer to equation 2.

(2)

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