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Ethan Walker
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Hvac Pump Head Calculation Pdf Download __TOP__

How to Calculate HVAC Pump Head and Download a Free PDF Guide

If you are working on an HVAC project, you may need to calculate the pump head of your system. Pump head is the pressure difference between the inlet and outlet of a pump, which determines how much water it can move and how much energy it consumes. Pump head is usually measured in feet or meters of water column.

hvac pump head calculation pdf download

Calculating pump head can be tricky, especially if you have a complex piping system with multiple fittings, valves and accessories. You need to consider the static head, dynamic head and friction loss of your system, as well as the suction and discharge pressures of your pump.

In this article, we will explain what these terms mean and how to calculate them using simple formulas. We will also provide you with a free PDF guide that you can download and use as a reference for your HVAC pump head calculation.

What is Static Head?

Static head is the vertical distance between the water level at the suction and discharge points of your pump. It is also called elevation head or gravity head. Static head does not change with the flow rate of your system, but it depends on the height of your tank or reservoir.

To calculate static head, you simply subtract the suction height from the discharge height. For example, if your suction height is 10 feet and your discharge height is 40 feet, then your static head is 30 feet.

What is Dynamic Head?

Dynamic head is the pressure difference caused by the velocity of the water in your piping system. It is also called velocity head or kinetic head. Dynamic head changes with the flow rate of your system, but it depends on the diameter of your pipes.

To calculate dynamic head, you need to know the flow rate and the velocity of your water. You can use this formula:

Dynamic head = (Vd - Vs) / 2g


  • Vd = discharge velocity, ft/s or m/s

  • Vs = suction velocity, ft/s or m/s

  • g = gravitational constant, 32.2 ft/s or 9.81 m/s

You can also use this formula to calculate the velocity of your water:

V = Q / A


  • V = velocity, ft/s or m/s

  • Q = flow rate, ft/s or m/s

  • A = cross-sectional area of pipe, ft or m

You can use this formula to calculate the cross-sectional area of your pipe:

A = πD / 4


  • A = cross-sectional area, ft or m

  • D = diameter of pipe, ft or m

  • π = 3.14

What is Friction Loss?

Friction loss is the pressure drop caused by the resistance of the water to flow through your piping system. It is also called head loss or pressure loss. Friction loss depends on the flow rate, the pipe material, the pipe length, the pipe diameter and the fittings and accessories in your system.