TDH is defined as which expression?

TDH is defined as which expression?

• A. Net discharge head minus net suction head
• B. Sum of head losses
• C. Discharge head only
• D. Suction head only

Answer: (A)

Total Dynamic Head is the energy the pump must provide to move fluid from suction to discharge. It is defined as the difference between the total head at the discharge side and the total head at the suction side. The head at each side includes pressure, velocity, and elevation: H = P/ρg + v^2/2g + z. So TDH = (P_d/ρg + v_d^2/2g + z_d) − (P_s/ρg + v_s^2/2g + z_s), i.e., net discharge head minus net suction head. This captures the overall energy change the pump must overcome, not just a single component or merely the friction losses.

Total Dynamic Head is the energy the pump must provide to move fluid from suction to discharge. It is defined as the difference between the total head at the discharge side and the total head at the suction side. The head at each side includes pressure, velocity, and elevation: H = P/ρg + v^2/2g + z. So TDH = (P_d/ρg + v_d^2/2g + z_d) − (P_s/ρg + v_s^2/2g + z_s), i.e., net discharge head minus net suction head. This captures the overall energy change the pump must overcome, not just a single component or merely the friction losses.