Chiller Plant Efficiency Analyzer Plant kW/ton (recommended)

Analyze whole-plant efficiency across time intervals: Plant kW/ton = Total Plant kW / TR. Total Plant kW can include chillers + CHW pumps + CW pumps + cooling tower fans + auxiliaries.

Boundary note: many engineering references describe overall full-load plant efficiency as including pump and tower fan power. Use this tool to set that boundary explicitly.

Interval table

0 rows
Project / Facilityoptional
Currency
Tariff/kWh
Emission factorkg/kWh
Units
Water-side load is computed from flow and ΔT. If you use glycol, treat results as screening unless you input accurate fluid properties.
kW/ton modeplant boundary
If you input component breakdown, the tool can still compute both, but the KPI headline follows this selection.
Data input templateoptional
CSV importheader row supported
Columns supported (any subset): period, timestamp, hours, tr, flow, flow_unit, supply, return, dt, dt_unit, total_kw, chillers_kw, chw_pumps_kw, cw_pumps_kw, tower_fans_kw, aux_kw, notes.
Auto hoursfrom timestamps
Outlier flagskW/ton
Period Hours TR (direct) Flow Supply Return ΔT Total plant kW Chillers kW CHW pumps kW CW pumps kW Tower fans kW Aux kW Notes Status Actions
Per row, you can provide either: TR directly, or water-side inputs (flow + supply + return or flow + ΔT). For power, you can provide Total plant kW directly, or component breakdown (tool sums to total). Standby equipment should be excluded.

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FAQ

What is Plant kW/ton and what does it include?
Plant kW/ton is the ratio of total electrical power consumed by the chilled-water plant to the delivered cooling load in tons. For whole-plant efficiency, it can include chillers plus CHW pumps, CW pumps, cooling tower fans, and any auxiliaries you decide to include in the boundary.
Why is energy-weighted annual kW/ton recommended?
A simple average of interval kW/ton can be misleading. Energy-weighted annual kW/ton uses total kWh divided by total ton-hours, which better represents seasonal performance across varying loads.
Why does Low-ΔT often cause high plant kW/ton?
Low ΔT increases chilled water flow for the same load, which raises pumping power and can force suboptimal staging. The tool flags low-ΔT intervals to help target commissioning and control fixes.
Can I compute TR from the water-side?
Yes. If you provide CHW flow and temperatures, the tool estimates cooling load. Use consistent units and ensure supply/return direction is correct; the tool will warn if ΔT is zero or negative.

Plant-grade chiller efficiency reporting for auditors and operators

This interval-based chiller plant efficiency tool helps engineers and energy auditors quantify Plant kW/ton with a clear boundary that can include pumps and tower fans. By using time-series intervals, you can compute an energy-weighted annual kW/ton, detect outliers, and link inefficiency to common drivers such as low ΔT, excessive pumping, and poor staging. Export-ready outputs support reporting, benchmarking, and measurement & verification workflows.