Method
Chilled-water mass and volume flow from cooling load and explicit water properties.
Equations
ṁ = Qcp · ΔT
V̇ = ṁρ
Symbols and units
| Symbol | Quantity | Unit |
|---|---|---|
| Inputs | ||
| Q | Cooling load | kW |
| cp | Water specific heat | kJ/kg·K |
| ΔT | Chilled-water supply-return difference | K |
| ρ | Water density | kg/m³ |
| Results | ||
| ṁ | Mass flow | kg/s |
| V̇ | Volume flow | m³/s |
| V̇ | Volume flow | L/s |
Assumptions and limits
- Chiller/pump count and redundancy are not selected.
Worked example
The input values are the calculator's own verification test, run through the calculator. They show the working; they are not design values.
Inputs
| Q | Cooling load | 100 kW |
| cp | Water specific heat | 4.186 kJ/kg·K |
| ΔT | Chilled-water supply-return difference | 10 K |
| ρ | Water density | 1,000 kg/m³ |
Results
| ṁ | Mass flow | 2.38892 kg/s |
| V̇ | Volume flow | 0.00238892 m³/s |
| V̇ | Volume flow | 2.38892 L/s |
A preliminary check for engineer review, not an engineering approval. The project calculation to the applicable codes, authority requirements and specification governs.