ISO 5222-2:2025 PDF

Heat recovery ventilators and energy recovery ventilators — Testing and calculating methods for seasonal performance factor — Part 2: Sensible cooling recovery seasonal performance factors of heat recovery ventilators (HRV)

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Title (English):

ISO 5222-2:2025

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 18
Publication date:: February 18, 2025
Edition:: ISO IS 5222 edition 1 version 1
ICS:: 23.120

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Description (English):

This document specifies the testing and calculating methods for sensible cooling recovery seasonal performance factor of heat recovery ventilators (HRV) covered by ISO 16494-1. This document also specifies the test conditions and the corresponding test procedures for determining the sensible cooling recovery seasonal performance factor of HRVs. The rating conditions are those specified in Annex B and in ISO 16494-1. The procedures of this document can be used for other temperature conditions.

Technical details

Technical committee: ISO/TC 86/SC 6 - Testing and rating of air-conditioners and heat pumps
SKU: ISO 5222-2:2025

Abstract

Overview

ISO 5222-2:2025 specifies standardized testing and calculation methods for the sensible cooling recovery seasonal performance factor (Fsc) of heat recovery ventilators (HRV) covered by ISO 16494-1. The document defines test conditions, procedures and rating rules (including default outdoor temperature bin distributions in Annex B) used to determine how effectively an HRV recovers sensible cooling over a cooling season. Procedures in this part can also be applied to other temperature conditions.

Key topics and technical requirements

Scope and definitions: Clarifies terms such as sensible cooling heat recovery, gross sensible cooling effectiveness (εsc), bypass ventilation function, bypass outdoor temperature (Tb) and seasonal performance factor (Fsc).
Standard test conditions: Specifies five reference test conditions (T1/T2/T3/T4/T8) with defined indoor/outdoor dry- and wet-bulb temperatures for cooling performance tests. These are aligned with ISO 16494-1 test methods.
Measured metrics:
- Gross sensible cooling effectiveness (εsc)
- Sensible cooling recovery capacity and seasonal cooling energy recovered (Esc)
- Power input characteristics including fan power with and without bypass (Pin)
- Seasonal performance factor Fsc (ratio of seasonal recovered sensible cooling to HRV electricity input)
Bypass control and Tb: Procedures to determine or verify a unit’s bypass outdoor temperature (manufacturer-specified or calculated per Annex D) and test protocols for HRVs with bypass ventilation.
Test procedures and instrumentation: Conformance with ISO 16494-1 for measurement accuracy, airflow, static pressure and efficiency tests; requirements for test reports (Annex E template).
Calculation framework: Bin-hour based method using outdoor temperature bins (Annex B), characteristics of recovery capacity vs. outdoor temperature, and seasonal aggregation procedures (Annex C for application-specific cooling load scenarios).

Practical applications - who uses this standard

HRV and HVAC product manufacturers - to design, validate and declare seasonal cooling performance.
Independent test laboratories - to run reproducible performance tests and verify manufacturer claims.
Certification bodies and regulators - for energy labeling, compliance and performance benchmarks.
Specifiers, consulting engineers and building energy modelers - to compare HRV options, size ventilation systems and estimate seasonal energy savings in cooling climates.
Facility managers and energy auditors - to evaluate retrofit opportunities and operational settings (including bypass control) that affect seasonal efficiency.

Related standards

ISO 16494-1:2022 (and Amendment 1:2023) - referenced normative test methods and performance metrics for HRVs/ERVs; ISO 5222-2 is intended to be used together with ISO 16494-1.

Keywords: ISO 5222-2:2025, heat recovery ventilators, HRV, sensible cooling recovery, seasonal performance factor, testing methods, bypass ventilation, ISO 16494-1.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and definitions: Clarifies terms such as sensible cooling heat recovery, gross sensible cooling effectiveness (εsc), bypass ventilation function, bypass outdoor temperature (Tb) and seasonal performance factor (Fsc).
Standard test conditions: Specifies five reference test conditions (T1/T2/T3/T4/T8) with defined indoor/outdoor dry- and wet-bulb temperatures for cooling performance tests. These are aligned with ISO 16494-1 test methods.
Measured metrics:
- Gross sensible cooling effectiveness (εsc)
- Sensible cooling recovery capacity and seasonal cooling energy recovered (Esc)
- Power input characteristics including fan power with and without bypass (Pin)
- Seasonal performance factor Fsc (ratio of seasonal recovered sensible cooling to HRV electricity input)
Bypass control and Tb: Procedures to determine or verify a unit’s bypass outdoor temperature (manufacturer-specified or calculated per Annex D) and test protocols for HRVs with bypass ventilation.
Test procedures and instrumentation: Conformance with ISO 16494-1 for measurement accuracy, airflow, static pressure and efficiency tests; requirements for test reports (Annex E template).
Calculation framework: Bin-hour based method using outdoor temperature bins (Annex B), characteristics of recovery capacity vs. outdoor temperature, and seasonal aggregation procedures (Annex C for application-specific cooling load scenarios).

Practical applications - who uses this standard

HRV and HVAC product manufacturers - to design, validate and declare seasonal cooling performance.
Independent test laboratories - to run reproducible performance tests and verify manufacturer claims.
Certification bodies and regulators - for energy labeling, compliance and performance benchmarks.
Specifiers, consulting engineers and building energy modelers - to compare HRV options, size ventilation systems and estimate seasonal energy savings in cooling climates.
Facility managers and energy auditors - to evaluate retrofit opportunities and operational settings (including bypass control) that affect seasonal efficiency.

Related standards

ISO 16494-1:2022 (and Amendment 1:2023) - referenced normative test methods and performance metrics for HRVs/ERVs; ISO 5222-2 is intended to be used together with ISO 16494-1.

Keywords: ISO 5222-2:2025, heat recovery ventilators, HRV, sensible cooling recovery, seasonal performance factor, testing methods, bypass ventilation, ISO 16494-1.

ISO 5222-2:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications - who uses this standard

Related standards

Related standards

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