Plant Utilities worked example

Chilled Water Delta T at 99% target delta t recovery: a worked example

This scenario runs the chilled water delta t calculation on the strong side: 99% target delta t recovery, with every other input held at its documented default. Use it when reviewing chilled water delta t for a utility budget, maintenance priority, capacity check, energy project, or production support plan.

The inputs for this scenario

  • Measured chilled water delta T: 8 °F (unchanged)
  • Design chilled water delta T: 12 °F (unchanged)
  • Target delta T recovery: 99 % (raised for this scenario; the documented default is 90)

Working through the calculation

  • Applying the documented formula (Chilled Water Delta T = measured chilled water delta t ÷ design chilled water delta t × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 66.67 % for chilled water delta t rate, the number this scenario is built around.
  • At this operating point the engine returns 32.33 points for gap to target.
  • At this operating point the engine returns 8 value for measured load or hours.
  • At this operating point the engine returns 12 value for available capacity or hours.

How this compares with the baseline

  • Against the tool's baseline example, where target delta t recovery sits at 90% and the headline result is 66.67 %, this scenario lands almost exactly on the baseline at 66.67 %.
  • Use it when diagnosing low delta T syndrome, commissioning a chiller plant, or tracking whether efficiency projects are restoring design delta T. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Chilled Water Delta T rate: 66.67 % (headline result)
  • Gap to target: 32.33 points
  • Measured load or hours: 8 value
  • Available capacity or hours: 12 value

Run it with your numbers

  • Every input above is editable in the live Chilled Water Delta T calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.