IMO CII and CO2 reporting for vessel HVAC-R systems

The Carbon Intensity Indicator (CII), mandatory under MARPOL Annex VI since 2023, is calculated from a vessel's total annual fuel consumption against its transport work, not from propulsion fuel alone. Auxiliary systems, and HVAC-R and chiller plants in particular, are a continuous background power draw. Performance drift in that system, such as refrigerant loss, unbalanced circuits, or poor chiller sequencing, raises fuel burn across every voyage of the reporting year, and every extra tonne of fuel burned pulls the CII rating in the wrong direction.

A vessel rated D for three consecutive years, or E in a single year, is required under SEEMP Part III to submit a corrective action plan showing how it will reach at least a C rating. Continuous, auditable performance data on the largest controllable auxiliary load, HVAC-R, is exactly the kind of evidence that plan needs to be credible rather than aspirational.

ClimaWISE doesn't file IMO DCS or EU MRV reports itself, submission stays with the vessel operator, flag administration or verifier. What it provides is the underlying evidence, continuously: a real-time and historical API exposes system-level HVAC-R efficiency and drift data that can be pulled directly into your SEEMP Part II monitoring methodology, MRV monitoring plan, or verification audit trail, so reported fuel consumption is no longer an unexplained number but one that's traceable to system performance on demand.

Yes. ClimaWISE's continuous thermodynamic fingerprint gives fleet managers a consistent, comparable performance record across vessels, rather than one-off surveys. That consistency is what makes vessel-to-vessel and voyage-to-voyage CII comparisons defensible in a reporting or corrective-action context.

Yes, and this is exactly where ClimaWISE is built to operate. The Energy Efficiency Existing Ship Index (EEXI, from 400 GT, applying to MARPOL Annex VI chapter 4 vessels engaged in trade) already catches virtually every commercially operated or chartered yacht from roughly 45 metres up. The Carbon Intensity Indicator (CII, from 5,000 GT) reaches the largest charter tonnage and every cruise vessel. The pattern holds at every size above that: a larger vessel runs a larger, continuous HVAC-R and chiller load, which means a larger share of annual fuel burn, which means a larger CII/EEXI impact, and a larger opportunity to move the rating with better data.

Yes. Refrigerant leakage from HVAC-R and provisions cooling systems is a direct emissions source, tracked separately from CO2 under F-Gas and MARPOL frameworks. ClimaWISE detects charge loss at 3% deviation, versus 50%+ for traditional monitoring methods, giving crews and fleet managers an early, quantifiable number instead of discovering the leak after most of the charge is gone.

Chief engineers use it to prioritise maintenance before an issue affects performance or fuel consumption. Fleet managers and DPAs use the same continuous record to compare vessels, support CII corrective action plans, and report consistent, measured figures instead of relying on periodic manual surveys.