Pipework
Pipe (connect ports)
Junction / tee node
Plant
Pump
Chiller (evaporator)
Boiler / HHW plant
Heat pump
Closed-circuit fluid cooler
Coils & HX
Cooling coil
Heating coil
Heat exchanger
Valves
Isolation valve
Balancing valve
Control valve (2-way)
Check valve
DP control valve
Accessories
Strainer
Flow meter
Flexible connection
Air separator
Buffer tank
Custom ΔP component
Expansion tank
Supply
Return
Return
Scroll to zoom · drag empty space to pan · R rotate · Ctrl+D duplicate · Del delete
CHW example loaded — Results below. Tabs: Results · Calculation Schedule · Pressure Profile · Warnings
Results & Pump Duty
Pump Duty
Design flow
18.0 L/s
Pump head
134.3 kPa
Pump head
13.69 m fluid
Index circuit loss
134.3 kPa
Hydraulic power
2.42 kW
Shaft power
3.36 kW
Absorbed power
3.65 kW
Annual energy
14594 kWh/yr
Head set automatically to the index-circuit loss (closed loop: static elevation excluded from net pump head). Recommended selection duty: 18.0 L/s @ 141.0 kPa (incl. 5% margin) — verify on manufacturer curve.
System Pressures (gauge, referenced to expansion tank)
Pump suction
164.9 kPa g
Pump suction abs
266.2 kPa a
Pump discharge
299.1 kPa g
Pump discharge abs
400.5 kPa a
Minimum pressure
66.1 kPa g @ N-5
Maximum pressure
299.1 kPa g @ PU-1
Highest point (EL 12 m)
132.9 kPa g
Lowest point (EL 0 m)
180.0 kPa g
Expansion Tank & Fill
Tank reference (cold fill)
180.0 kPa g
Static to highest point
118 kPa
Suggested cold-fill
148 kPa g
Suggested pre-charge
138 kPa g
Relief valve setting
600 kPa g
Index Circuit
Highest-resistance path from pump discharge to suction (19 elements). Losses along path:
| # | Element | Type | Flow L/s | ΔP kPa | Cumulative kPa |
|---|---|---|---|---|---|
| 1 | DN150 (PU-1→CH-1) | Pipe DN150 | 18.0 | 1.84 | 1.84 |
| 2 | CH-1 | Chiller (evaporator) | 18.0 | 45.00 | 46.84 |
| 3 | DN150 (CH-1→N-1) | Pipe DN150 | 18.0 | 0.23 | 47.08 |
| 4 | CHWS riser L0–L1 (N-1→N-2) | Pipe DN150 | 18.0 | 0.43 | 47.51 |
| 5 | CHWS riser L1–L2 (N-2→N-3) | Pipe DN125 | 12.0 | 0.60 | 48.11 |
| 6 | CHWS riser L2–L3 (N-3→N-4) | Pipe DN100 | 6.0 | 0.45 | 48.56 |
| 7 | L3 branch (N-4→CC-1) | Pipe DN80 | 6.0 | 5.45 | 54.00 |
| 8 | CC-1 | Cooling coil | 6.0 | 32.00 | 86.00 |
| 9 | DN80 (CC-1→CV-1) | Pipe DN80 | 6.0 | 0.44 | 86.45 |
| 10 | CV-1 | Control valve (2-way) | 6.0 | 18.69 | 105.14 |
| 11 | DN80 (CV-1→BV-1) | Pipe DN80 | 6.0 | 0.22 | 105.36 |
| 12 | BV-1 | Balancing valve | 6.0 | 5.00 | 110.36 |
| 13 | DN80 (BV-1→N-5) | Pipe DN80 | 6.0 | 5.00 | 115.37 |
| 14 | CHWR riser L3–L2 (N-5→N-6) | Pipe DN100 | 6.0 | 0.29 | 115.66 |
| 15 | CHWR riser L2–L1 (N-6→N-7) | Pipe DN125 | 12.0 | 0.60 | 116.26 |
| 16 | CHWR riser L1–L0 (N-7→N-8) | Pipe DN150 | 18.0 | 0.57 | 116.83 |
| 17 | CHWR main (N-8→ST-1) | Pipe DN150 | 18.0 | 2.32 | 119.14 |
| 18 | ST-1 | Strainer | 18.0 | 15.00 | 134.14 |
| 19 | DN150 (ST-1→PU-1) | Pipe DN150 | 18.0 | 0.12 | 134.26 |
Fluid: Water at 6°C — ρ 999.9 kg/m³, μ 1.46 mPa·s, pv 0.9 kPa abs. Atmospheric pressure taken as 101.325 kPa. This calculator is an engineering design aid — verify final selections against project requirements, manufacturer data and applicable standards.
Fluid & System
ρ = 999.9 kg/m³ · μ = 1.46 mPa·s · pv = 0.9 kPa abs
Glycol properties interpolated from published aqueous glycol data — verify against supplier data for final design.
Glycol properties interpolated from published aqueous glycol data — verify against supplier data for final design.
Tips
Drag components in, press P for the pipe tool, click two ports to connect. Each pipe carries its own length, size and flow. Set component elevations for risers — the calculator handles static pressure correctly for a closed loop (no static in pump head; full static in local pressures).