Total dynamic head
Encyclopedia
Total Dynamic Head is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe.
TDH = Static Height + Static Lift + Friction Loss
where:
Static Lift is the height the water will rise before arriving at the pump (also known as the suction head).
Static Height is the maximum height reached by the pipe after the pump (also known as the 'discharge head').
Friction Loss (or Head Loss).
This equation can be derived from Bernoulli's Equation.
For a relatively incompressible fluid such as water, TDH is simply the pressure head
difference between the inlet and outlet of the pump, if measured at the same elevation and with inlet and outlet of equal diameter.
TDH is also the work
done by the pump per unit weight, per unit volume of fluid.
TDH = Static Height + Static Lift + Friction Loss
where:
Static Lift is the height the water will rise before arriving at the pump (also known as the suction head).
Static Height is the maximum height reached by the pipe after the pump (also known as the 'discharge head').
Friction Loss (or Head Loss).
This equation can be derived from Bernoulli's Equation.
For a relatively incompressible fluid such as water, TDH is simply the pressure head
Pressure head
Pressure head is a term used in fluid mechanics to represent the internal energy of a fluid due to the pressure exerted on its container. It may also be called static pressure head or simply static head...
difference between the inlet and outlet of the pump, if measured at the same elevation and with inlet and outlet of equal diameter.
TDH is also the work
Mechanical work
In physics, work is a scalar quantity that can be described as the product of a force times the distance through which it acts, and it is called the work of the force. Only the component of a force in the direction of the movement of its point of application does work...
done by the pump per unit weight, per unit volume of fluid.
External links
- http://www.sporservis.com/?urun-6627-DYNAMIC-TOTAL-MEKiK-ALETi.html
- On-line TDH calculator - Pump World
- Another On-line TDH calculator - W.D.Moore & Co., wind/solar pump manufacturer
- http://www.wolframalpha.com/input/?i=total+dynamic+head -wolframalpha.com