Trusted by 1000+ companies around the world
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:
h_f = 10.67 × (Q^1.852) / (C^1.852 × D^4.87) × L_eq
L_eq = L_pipe + Σ (N_fitting × L_fitting_eq) chilled water pump head calculation excel sheet
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 |
Common equivalent lengths (for water, schedule 40 steel pipe): Note: For closed loops, static elevation head is
h_f = f × (L_eq / D) × (v² / (2g))
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: | | Chiller evaporator drop | kPa, psi
| 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):
Our service never stops with the sales of our softwares or API Solutions. It goes on in the form of after-sales service since we understand that our products are designed to satisfy your requirements for many years to come.We’ve an established and efficient system in place to deal with all of your after sale support needs.
Every project we take on starts with the aim of being our 'best yet', so you can be assured that our attention to detail and high quality work is present in every job we craft. We want our customers to be as excited and proud of the end product as we are, and we strive towards that goal every day.
Whatever your Business requirement, Travelopro offers completely managed best fit travel technology solution.
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:
h_f = 10.67 × (Q^1.852) / (C^1.852 × D^4.87) × L_eq
L_eq = L_pipe + Σ (N_fitting × L_fitting_eq)
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 |
Common equivalent lengths (for water, schedule 40 steel pipe):
h_f = f × (L_eq / D) × (v² / (2g))
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:
| 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):
Hotels
Flight
Forex
Business
Cruise
Buses
Rails
Holidays
Cars
Destination
Sigts
Visa
Insurance
Powered by our Industry Leading Travel Technology – Including complete inventory and Global Fares –
Travelopro gives you the highest quality travel technology solution to power your brand.
Features of our online travel booking system