Industrial Heat Pumps & Electrified Thermal Systems worked example

Refrigerant Loss Exposure at 2.16% expected annual leak rate of the fleet: a worked example

Suppose expected annual leak rate of the fleet falls to 2.16%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate annual refrigerant loss exposure for a heat pump fleet from installed unit count, average charge, expected leak rate, and reserve for service or abnormal events.

The inputs for this scenario

  • Heat pump units or refrigerant circuits in service: 24 units (held at the documented default)
  • Refrigerant charge per unit (e.g. R-1234ze, R-744): 75 kg / unit (held at the documented default)
  • Expected annual leak rate of the fleet: 2.16 % (the input this scenario stresses; the baseline uses 3)
  • Service venting and leak-event reserve: 50 kg (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base refrigerant loss exposure = heat pump units or circuits × refrigerant charge per unit × expected annual refrigerant loss.
  • Consumption works out to 1,800 kg at these inputs, and this is the headline figure for the scenario.
  • Run cost works out to 3,888 $ at these inputs.
  • Runtime works out to 75 hr at these inputs.
  • Unit cost works out to 2.16 $ / unit at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected annual leak rate of the fleet sits at 3% and the headline result is 1,800 kg, this scenario lands almost exactly on the baseline at 1,800 kg.
  • It computes the expected kilograms of refrigerant lost across a heat pump fleet in a year, including a reserve for service venting and leak events. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Consumption: 1,800 kg (headline result)
  • Run cost: 3,888 $
  • Runtime: 75 hr
  • Unit cost: 2.16 $ / unit

Run it with your numbers

  • To rerun this with your own numbers, open the live Refrigerant Loss Exposure calculator, set expected annual leak rate of the fleet to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.