Chilled Water Tonnage Calculator
Live cooling duty from chilled-water flow and ΔT — the BTU-meter formula.
'Low ΔT syndrome' — loads returning water at 9 °C instead of 12 — silently halves plant capacity. This formula is how you catch it.
Formula
Chilled Water Tonnage Calculator is a free chilled water tons for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Chilled Water Tonnage Calculator
Live cooling duty from chilled-water flow and ΔT — the BTU-meter formula. The calculation implements Q = ṁ·c_p·ΔT; US: tons = gpm×ΔT(°F)/24 (ASHRAE — chilled water plant design guide). 'Low ΔT syndrome' — loads returning water at 9 °C instead of 12 — silently halves plant capacity. This formula is how you catch it.
How to use Chilled Water Tonnage Calculator
- 1Enter Water flow in L/s.
- 2Enter Return temperature in °C.
- 3Enter Supply temperature in °C.
- 4Read Cooling duty, Tonnage instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Chilled Water Tonnage Calculator?
- ✓Implements the standard formula — Q = ṁ·c_p·ΔT; US: tons = gpm×ΔT(°F)/24
- ✓Reference cited on-page: ASHRAE — chilled water plant design guide
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Chilled Water Tonnage Calculator use?+
It computes Q = ṁ·c_p·ΔT; US: tons = gpm×ΔT(°F)/24, per ASHRAE — chilled water plant design guide. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
'Low ΔT syndrome' — loads returning water at 9 °C instead of 12 — silently halves plant capacity. This formula is how you catch it.
Is this based on ASHRAE methods?+
The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.
Is the Chilled Water Tonnage Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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