Formula & worked example
Plant kW/ton=(chiller+pumps+tower)/TR; COPplant=3.5168525/(kW/ton).
A 500 TR plant using 260 kW chiller + 70 kW auxiliaries operates at 0.66 kW/ton.
Plant engineering calculator · Updated Sep 17, 2026
Chiller Plant Efficiency Calculator — Total Plant kW/Ton, COP & Cost
Benchmark whole chilled-water plant efficiency by combining chiller, chilled-water pump, condenser-water pump and cooling-tower fan power against measured cooling load.
Inputs
Live result
Total plant power 330 kW
Whole-plant efficiency 0.66 kW/ton
Whole-plant COP 5.328564
Chiller-only contribution 0.52 kW/ton
CHW pump contribution 0.05 kW/ton
CW pump contribution 0.06 kW/ton
Tower/other contribution 0.03 kW/ton
Auxiliary share 21.21212%
Annual indicated energy 1,320 MWh
Annual indicated cost 158,400
Assumptions & limits
- Use simultaneous measured load and electrical demand.
- Include all material plant auxiliaries for fair plant-to-plant comparison.
Frequently asked questions
What does this Chiller Plant Efficiency Calculator calculate?
Benchmark whole chilled-water plant efficiency by combining chiller, chilled-water pump, condenser-water pump and cooling-tower fan power against measured cooling load.
Can I use the result for final equipment selection?
Use it for screening, benchmarking and option comparison. Final selection should use measured conditions, manufacturer performance data and applicable engineering standards.
Why are assumptions shown beside the calculation?
Plant calculations change materially with pressure basis, reference conditions, efficiencies and operating profile. Explicit assumptions make the result auditable instead of hiding those choices.