Chilled Water Pump Head Calculator

Calculate pump head and system friction loss

System Configuration

System Type

Pipe Material

Fluid Type

Flow Parameters

Design Flow Rate

Fluid Temperature

°C

Main Pipe Size

Piping System

Total Pipe Length

90° Elbows

45° Elbows

Tee (Flow-thru)

Tee (Branch)

Gate Valves

Globe Valves

Check Valves

Equipment Pressure Drop

Chiller/Boiler

kPa

AHU/FCU Coils

kPa

Strainer/Filter

kPa

Control Valve

kPa

Static Head (Open Systems Only)

System Type

Calculation Results

Total Pump Head

kPa (- m H₂O)

Design Flow

L/min (- GPM)

Pump Power (Est.)

kW (η = 70%)

Pipe Velocity

m/s

Head Loss Breakdown

Pipe Friction: -

Fitting Loss: -

Equipment Loss: -

Static Head: -

Pipe Sizing Check

Design Guidelines

Recommended Pipe Velocities

Pipe Size	Max Velocity (m/s)
25-50mm (1"-2")	1.2 - 1.5
65-100mm (2.5"-4")	1.5 - 2.0
125-200mm (5"-8")	2.0 - 2.5
250mm+ (10"+)	2.5 - 3.0

Typical Equipment Pressure Drop

Equipment	Pressure Drop (kPa)
Chiller Evaporator	35 - 70
AHU Cooling Coil	20 - 50
FCU Coil	15 - 35
Strainer (Clean)	7 - 15
2-Way Control Valve	20 - 50

Design Notes

• Add 10-20% safety margin to calculated pump head
• For glycol systems, increase head by 10-25% depending on concentration
• Consider future expansion when sizing pumps
• VFD (Variable Frequency Drive) pumps recommended for variable flow systems
• Always verify with actual equipment data sheets