HVAC Checks built this chilled water plant efficiency calculator as a practical resource for facility managers, controls technicians, commissioning providers, and energy teams who need a quick operating benchmark from real plant data rather than design-only assumptions.
Use it to compare delivered tons against total plant kW, flag low Delta T conditions, and screen whether staging, pumping, condenser water control, or BAS sequence issues may be pulling plant performance away from expectations.
Enter current operating conditions from the BAS, metering, or a stable operating snapshot. Average field values are usually more useful than design numbers when you are trying to understand real plant behavior.
HVAC Checks note: large mismatches between entered load and flow-based tonnage usually deserve a quick sensor, meter, or time-alignment check before the result is treated as a plant finding.
Delta T: Return water temperature minus supply water temperature.
Estimated tons: Flow in gpm multiplied by Delta T, divided by 24.
Total plant kW: Chiller kW plus pump kW plus cooling tower fan kW.
Plant kW per ton: Total plant kW divided by estimated tons. Lower values generally indicate better overall plant efficiency.
Estimated energy cost: Total plant kW multiplied by annual operating hours and the blended utility rate.
If the current numbers do not line up with expected plant performance, HVAC Checks can help review BAS trends, sequence logic, auxiliary loads, and commissioning findings before the issue turns into another season of avoidable energy cost.