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Chiller Performance and COP — online

Is your chiller still delivering its design kW/TR, and if not, is it the machine, the tubes or just a hot cooling tower?

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Sheet

Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 39) — the Guide, method and references are in the Excel file.

Input help: select an input to see what it means and which units it takes.

What this chiller performance and cop calculator does

Capacity, COP, kW/TR and EER of a water-cooled chiller: IPLV-style part-load efficiency, Carnot fraction, approaches and UA for fouling, and design, actual and proposed cases with a condenser water what-if.

  • Cooling capacity. From the water side or the refrigerant side; both shown when entered, and the difference flags a metering problem.
  • COP, kW/TR and EER. From measured compressor power or motor amps, volts and power factor, with the load as a share of rated capacity.
  • IPLV-style part-load efficiency. Weighted from four part-load points, aligned with the publicly documented AHRI 550/590 weighting, or with your own site weights.
  • Carnot fraction. On refrigerant saturation temperatures or water temperatures, to separate a poor machine from a high lift.
  • Approaches and UA. Evaporator and condenser approach, log-mean temperature difference and effective UA against design for tube fouling checks.
  • Condenser water what-if. The effect of condenser water temperature and chilled-water setpoint on compressor power, as a table and chart.

How it was checked

All 32 combinations of the five method selectors, 14 unit-system variants and 55 edge cases against an independent Python model (IAPWS-IF97 water properties); results agree within 1e-9 relative.

Related

Questions

Is the chiller performance and cop calculator free?

You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all online tools (USD 15) or a yearly one (USD 99).

Are the results the same as the Excel tool?

Yes. The online tool runs the formulas of the Chiller Performance and COP Excel workbook and was checked cell by cell against the Excel file.