ISO 8933-1:2024

Overview

ISO 8933-1:2024 - Ships and marine technology - Energy efficiency - Part 1: Energy efficiency of individual maritime components defines standardized, generic measuring and calculation methods to evaluate the energy efficiency of major, energy‑consuming shipboard components. The standard applies to components with a clearly defined “unit output” (e.g., pumps, fans, gearboxes, heat exchangers, centrifuges) installed on ships, inland vessels or offshore structures. It explicitly excludes propulsion components (for example, propellers).

Keywords: ISO 8933-1:2024, energy efficiency, maritime components, ships, measuring methods, calculation methods, marine technology.

Key topics and technical requirements

• Scope and definitions: Clear definitions of input, output, component, and energy efficiency (aligned with ISO/IEC terminology).
• Methodology (Clause 5): Generic method to evaluate component efficiency using representative operational boundaries and process windows that match expected onboard use.
• Measuring conditions: Requirements to define test and measurement conditions so results reflect normal operational patterns, accounting for ambient and operational variability.
• Component‑specific clauses:
  • Pumps (Clause 6): inputs/outputs, boundary definitions, calculation and measuring methods.
  • Fans (Clause 7): performance metrics, flow and pressure considerations, test procedures.
  • Mechanical power transmission / Gearboxes (Clause 8): input/output definitions, calculation and measurement procedures.
  • Heat exchanging (Clause 9): thermal energy flows, electrical heaters, calculation and measurement techniques.
  • Centrifuges (Clause 10): defining unit output, measuring and calculation approaches.
• Symbols and units: Standardized symbols (E, P, Q, qV, ṁ, η, ρ, etc.) and units for consistent reporting.
• Objective comparison: Standardized outputs enable objective comparisons between different components for retrofit or newbuild decisions.

Practical applications

• Selecting energy‑efficient components during newbuild or retrofit procurement.
• Performing ship energy audits and component-level benchmarking.
• Enabling manufacturers to validate component performance under ship-representative conditions.
• Supporting compliance efforts tied to ship energy management (e.g., IMO SEEMP) and corporate sustainability targets.
• Informing life‑cycle cost and carbon-emission reduction analyses.

Who should use this standard

• Shipowners and operators evaluating retrofit options
• Shipyards and naval architects integrating systems during design and installation
• Maritime equipment manufacturers and test labs
• Classification societies, regulators, and energy managers conducting performance verification

Related standards and references

• ISO/IEC term definitions (referenced for energy efficiency terminology)
• IMO SEEMP (context and motivation for energy efficiency measures)
• ISO/TC 8 (technical committee responsible for ships and marine technology)

ISO 8933-1:2024 provides a practical, standardized basis for measuring and reporting the energy efficiency of individual maritime components to improve operational energy performance and support informed procurement and regulatory decisions.