Chilled Water Pump Head Calculation Excel Sheet -

L_eq = L_pipe + Σ (N_fitting × L_fitting_eq)

Note: For closed loops, static elevation head is zero because the column of water is balanced on supply and return sides. Only pressure drop due to elevation differences in components (e.g., coils on different floors) matters if not balanced by return piping. Essential Inputs | Parameter | Unit | Description | |-----------|------|-------------| | Flow rate (GPM or m³/hr) | m³/hr, L/s, GPM | System design flow | | Pipe length | m, ft | Total equivalent length (straight + fittings) | | Pipe diameter | mm, in | Inner diameter | | Pipe roughness | mm | For friction factor calculation | | Fittings & valves | count | Elbows, tees, strainers, butterfly valves, etc. | | Chiller evaporator drop | kPa, psi | From chiller datasheet | | AHU/FCU coil drop | kPa, psi | From coil datasheet | | Control valve drop | kPa, psi | Usually 15–30% of coil drop | | Strainer drop (clean) | kPa, psi | Manufacturer data | | Elevation difference | m, ft | Between lowest and highest point (for open or if unbalanced) | 3. Calculation Methodology in Excel Step 1 – Equivalent Length Method Instead of calculating fittings separately, convert all fittings to equivalent pipe length:

In Excel, convert all to consistent units. Worksheet: Pump Head Calculator | A | B | C | D | |---|---|---| | Input Data | | Value | Unit | | Flow rate (Q) | | 100 | m³/hr | | Pipe length (straight) | | 150 | m | | Pipe inner diameter | | 150 | mm | | Pipe roughness (ε) | | 0.15 | mm | | No. of 90° elbows | | 12 | | | No. of gate valves | | 4 | | | No. of strainers | | 1 | | | Chiller drop | | 60 | kPa | | Coil drop | | 30 | kPa | | Control valve drop | | 10 | kPa | | Elevation difference (if open system) | | 0 | m | chilled water pump head calculation excel sheet

h_f = 10.67 × (Q^1.852) / (C^1.852 × D^4.87) × L_eq

1. Objective To provide a structured, reusable Excel-based method for calculating the total dynamic head (TDH) of a chilled water pump in a closed-loop HVAC system. Accurate head calculation ensures proper pump selection, energy efficiency, and system reliability. 2. Key Parameters for Pump Head Calculation In a closed chilled water system, the total head (in meters or feet) is the sum of: L_eq = L_pipe + Σ (N_fitting × L_fitting_eq)

Common equivalent lengths (for water, schedule 40 steel pipe):

| Fitting | Equivalent length (m) per 100 mm pipe dia | |---------|-------------------------------------------| | 90° elbow | 0.3 – 0.6 | | Tee (straight) | 0.6 – 1.2 | | Tee (branch) | 1.5 – 2.4 | | Gate valve (open) | 0.15 – 0.3 | | Globe valve (open) | 6 – 10 | | Swing check valve | 2 – 4 | | Strainer | 3 – 6 | Darcy-Weisbach (more accurate): | | Chiller evaporator drop | kPa, psi

h_f = f × (L_eq / D) × (v² / (2g))

Chilled Water Pump Head Calculation Excel Sheet -

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