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Calculating the total dynamic head (TDH) for a chilled water system is a fundamental step in HVAC design to ensure proper flow and system efficiency. Using a allows engineers to automate repetitive calculations, such as determining friction losses through varying pipe diameters and equivalent lengths of fittings. The Core Formula for Total Pump Head
A is more than just a convenience — it is a professional’s tool for precision, speed, and documentation. By building your own sheet following the structure above, you gain complete control over your calculations, avoid costly mistakes, and can easily adapt to any project, from a small office to a district cooling plant. chilled water pump head calculation excel sheet
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. Calculating the total dynamic head (TDH) for a
Assume you have the following system requirements: By building your own sheet following the structure
This article provides a complete, step‑by‑step guide to understanding pump head calculation, building your own Excel sheet, and using it like a seasoned HVAC engineer.
| Fitting Type | Equivalent Length (ft) for Pipe Size (in) → | 2" | 3" | 4" | 6" | |--------------|---------------------------------------------|----|----|----|----| | 90° Elbow | | 5 | 7 | 9 | 12 | | Tee (straight)| | 3 | 4 | 5 | 8 | | Gate valve | | 1 | 1.5| 2 | 3 |