1. What is Total Dynamic Head?

Total Dynamic Head (TDH) is the total equivalent height that a fluid needs to be pumped, accounting for both the static lift and friction losses in the system. It's a crucial parameter for selecting the right pool pump.

2. How Does the Calculator Work?

The calculator uses the simple TDH formula:

Where:

• \( Static\ Head \) — Vertical distance from pool water level to discharge point (ft)
• \( Friction\ Loss \) — Pressure loss due to pipe friction and fittings (ft)

Explanation: The static head represents the vertical component, while friction loss accounts for resistance in pipes, fittings, and equipment.

3. Importance of TDH Calculation

Details: Proper TDH calculation ensures you select a pump with adequate power for your pool system. An undersized pump won't circulate water effectively, while an oversized pump wastes energy and may cause excessive wear.

4. Using the Calculator

Tips: Measure static head as the vertical distance from the pool water level to the highest point in your system. Friction loss can be estimated from pipe size, length, and flow rate using standard tables or calculators.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure static head?
A: Measure the vertical distance from the pool water surface to where water exits your system (like a waterfall or return jets).

Q2: What affects friction loss?
A: Pipe diameter, length, number of fittings, filter condition, and flow rate all impact friction loss. Smaller pipes and higher flow rates increase friction.

Q3: What's a typical TDH for residential pools?
A: Most residential pools have TDH between 40-70 ft, with spa combinations sometimes higher.

Q4: Should I add safety factor to the calculation?
A: It's common to add 10-20% to account for filter clogging and other variables when selecting a pump.

Q5: How does TDH affect pump selection?
A: Pumps have performance curves showing flow rates at different TDH values. Match your calculated TDH to the pump curve to find the right model.