What is the term for the sum of total static head, head loss, and velocity head?

The term that represents the sum of total static head, head loss, and velocity head is known as total head. Total head is a concept used to describe the total potential energy available in a fluid system due to the elevation and pressure differences, along with the kinetic energy due to velocity.

When considering fluid dynamics, total static head refers to the height of a fluid column due to the pressure at the system's elevation. Head loss accounts for the energy lost due to friction or turbulence as the fluid moves through pipes or fittings. Velocity head is related to the kinetic energy of the fluid as it flows.

By summing these three components, one obtains the total head, which is crucial in determining flow rates, pump performance, and the overall efficiency of fluid systems. This comprehensive view enables engineers to assess how effectively a fluid can be transported from one point to another in a system.

Other terms like net head, dynamic head, or effective head do not accurately encapsulate the combination of all these aspects, which is why total head is the correct terminology in this context.