TDH
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In fluid dynamics, total dynamic head (TDH) is the work to be done by a pump, per unit weight, per unit volume of fluid. TDH is the total amount of system pressure, measured in feet, where water can flow through a system before gravity takes over, and is essential for pump specification.
T
D
H
=
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z
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ψ
ρ
g
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Δ
v
2
2
g
+
h
F
{\displaystyle {TDH=\Delta z+\Delta {\frac {\psi }{\rho g}}+\Delta {\frac {v^{2}}{2g}}}+h_{F}}
TDH = Static Lift + Pressure Head + Velocity Head + Friction Loss
where:
Static lift is the difference in elevation between the suction point and the discharge point.
Pressure head is the difference in pressure between the suction point and the discharge point, expressed as an equivalent height of fluid.
Velocity head represents the kinetic energy of the fluid due to its bulk motion.
Friction loss (or head loss) represents energy lost to friction as fluid flows through the pipe.
This equation can be derived from Bernoulli's Equation.
For incompressible liquids such as water, Static lift + Pressure head together equal the difference in fluid surface elevation between the suction basin and the discharge basin.
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