Chilled Water Pump Head Calculation __link__ Jun 2026

Following this method ensures optimal pump selection, energy efficiency, and reliable system operation.

The proper sizing of chilled water pumps is critical for the efficiency, reliability, and cost-effectiveness of HVAC systems. This paper presents a systematic methodology for calculating the total pump head required in a closed-loop chilled water system. It covers fundamental fluid mechanics principles, component pressure drop analysis, safety factors, and practical considerations such as open vs. closed systems, variable flow, and common pitfalls.

In variable flow with two-way control valves, the pump must handle the pressure drop of the most remote coil plus the drop through the longest piping route. chilled water pump head calculation

Accurate calculation of the chilled water pump head is crucial to ensure that the pump is properly sized and can provide the required pressure to overcome the system's resistance. An incorrect calculation can lead to:

Historically, engineers added a blanket 10-15% safety factor to the calculated head. Following this method ensures optimal pump selection, energy

Accurate chilled water pump head calculation requires:

| Component | Pressure drop (m water column) | |-----------|-------------------------------| | Chiller evaporator | 5–10 | | AHU coil | 2–5 | | 2-way control valve | 2–5 | | Strainer (clean) | 1–2 | | Pipe friction | 2–6 m per 100 m | Accurate calculation of the chilled water pump head

For a (no open tank), the total head ( H_total ) is:

Select a pump with best efficiency point (BEP) at 50 m³/h and 34.5 m head.