Power and energy

Chiller COP and kW-per-ton sanity check

Calculate instantaneous COP, kW/ton and EER from cooling capacity and electrical input measured over the same period.

Calculate

Time-aligned cooling and power
kW
kW

Worked example

Cooling COP, instantaneous

 

Electrical input per ton of cooling
 kW/ton
Equivalent EER
 Btu/Wh
Cooling capacity
 kW
Electrical input within the boundary
200 kW

Instantaneous, time-aligned sanity check only; this is not IPLV, NPLV or certified rating-point performance.

Underlined figures are rounded. Select one to copy its full value.

Method and assumptions

Formula

COP = cooling kW ÷ electrical input kW; kW/ton = electrical input ÷ refrigeration tons

One refrigeration ton is 3.5168525 kW of cooling. EER = COP × 3.412141633 Btu/(Wh).

Limits of this result

  • This is an instantaneous ratio, not IPLV, NPLV or a certified rating-point result.
  • Cooling capacity and electrical input must cover the same interval and stated equipment or plant boundary.
  • Compare performance only after accounting for load, temperatures, flow, fouling, controls and measurement uncertainty.

Technical sources

  1. Purchasing Energy-Efficient Electric ChillersUS Department of Energy FEMP · updated 2024-10

Put the value to work

Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.

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