1. What is Total Dynamic Head?

Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account static head, friction head loss, and velocity head. It's a crucial parameter for pump selection and system design in water systems.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• \( H_{static} \) — Static head (elevation difference in meters)
• \( H_{friction} \) — Friction head loss (meters)
• \( H_{velocity} \) — Velocity head (meters)
• \( V \) — Fluid velocity (m/s)
• \( g \) — Acceleration due to gravity (9.81 m/s²)

Explanation: The equation accounts for all components of energy required to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can overcome system resistance and deliver required flow rates.

4. Using the Calculator

Tips: Enter static head (elevation difference), friction losses from pipe calculations, and fluid velocity. All values must be non-negative.

5. Frequently Asked Questions (FAQ)

Q1: Which component is typically most significant?
A: For most water systems, static head and friction losses dominate, with velocity head often being relatively small.

Q2: How do I determine friction losses?
A: Friction losses can be calculated using the Hazen-Williams or Darcy-Weisbach equations based on pipe characteristics and flow rate.

Q3: When can velocity head be neglected?
A: In systems with low velocities (typically < 1 m/s), velocity head is often negligible compared to other components.

Q4: Does TDH change with flow rate?
A: Yes, friction losses increase with flow rate, so TDH is typically higher at higher flow rates.

Q5: How does this relate to pump curves?
A: The calculated TDH at your desired flow rate should match the pump's performance curve for proper operation.