ISO 916:2020

Overview - ISO 916:2020 (Testing of refrigerating systems)

ISO 916:2020 defines methods and requirements for the performance testing of compressor‑driven refrigerating systems that operate by the vapour‑compression cycle. The standard covers complete refrigeration circuits (compression, condensation, evaporation, interconnecting pipes and ancillaries) and is applicable to on‑site and laboratory tests where no more specific system test standard exists. It excludes other refrigeration types (for example, absorption or steam‑jet systems) and does not address suitability testing for specific end‑use equipment (household refrigerators, air conditioners, display cabinets).

Key topics and technical requirements

ISO 916:2020 organizes technical content to support reliable, repeatable refrigeration system testing:

• Definitions, symbols and units for refrigerating capacities, enthalpy, mass flow, COP and related parameters.
• Performance warranty concepts: what to guarantee (overall, net, and useful refrigerating capacity; compressor and ancillary power; system power; cooling water demand; coefficient of performance) and how to specify operating conditions, tolerances and acceptance limits.
• Test preparation and procedures including agreed operating conditions for warranty verification and field testing.
• Measuring instruments requirements and guidance: temperature probes, pressure gauges, electrical power meters, flow meters, speed and torque sensors, time and mass measurement devices.
• Determination methods for refrigerating capacity: direct (overall, net, useful) and indirect methods (calibrated compressor, energy balance).
• Drive power measurement for compressors and overall system.
• Measurement uncertainties, results conversion and material properties - ensuring test results can be converted to guaranteed values and reported with known uncertainty.
• Normative reference to ISO 5167 for fluid flow measurement where applicable.

Practical applications and users

ISO 916:2020 is essential for professionals involved in refrigeration performance verification, including:

• HVAC/R test laboratories and commissioning teams performing system acceptance tests.
• Manufacturers and system integrators validating product performance and meeting contractual warranties.
• Field service engineers and asset owners verifying on‑site system capacity and energy performance.
• Procurement, QA and certification bodies assessing compliance with specified performance levels.

Use ISO 916:2020 when you need consistent, traceable procedures for measuring refrigerating capacity, drive power and COP of vapour‑compression systems - especially for on‑site tests or where no specific laboratory test standard exists.

Related standards

• ISO 5167 (Measurement of fluid flow by means of pressure differential devices) - normative reference used for flow measurements cited in ISO 916:2020.