ISO 16358-1:2013/Amd 2:2024

Overview

ISO 16358-1:2013/Amd 2:2024 is the latest amendment to the international standard that defines testing and calculation methods for determining the Cooling Seasonal Performance Factor (CSPF) of air-cooled air conditioners and air-to-air heat pumps. Developed by ISO Technical Committee ISO/TC 86, this amendment updates the parameters and default values for evaluating the seasonal energy efficiency of cooling systems, providing refined methods that ensure reliability and comparability across global markets.

This standard focuses exclusively on the cooling seasonal performance factor, essential for measuring how efficiently an air conditioner or heat pump performs throughout a typical cooling season under variable climate and operational conditions. By establishing accurate and standardized testing conditions, ISO 16358-1:2013/Amd 2:2024 supports manufacturers, regulators, and consumers in assessing energy consumption and optimizing system design.

Key Topics

• Cooling Seasonal Performance Factor (CSPF): The primary metric defined for quantifying seasonal cooling efficiency.
• Testing Conditions: Prescribes specific indoor and outdoor dry-bulb (DB) and wet-bulb (WB) temperatures, along with humidity ranges that replicate typical moderate climate conditions.
• Capacity and Power Input Measurements: Defines test points for full capacity, half capacity, and minimum capacity cooling outputs with corresponding power inputs.
• Formula Updates: Introduces formulas (28) and (29) to accurately calculate temperatures at which power input drops to zero, ensuring valid testing data.
• Default Values and Validation: Provides default test data and rules for invalidating optional test results if they fall outside defined validity ranges.
• Degradation Coefficient: Specifies considerations for the degradation coefficient under low humidity and cyclic cooling test scenarios.
• Compliance with Related ISO Standards: Aligns with ISO 5151, ISO 13253, and ISO 15042 regarding voltage, frequency, and climatic testing protocols.

Applications

This amendment to ISO 16358-1 is critically important for several practical applications:

• Energy Efficiency Certification: Supports HVAC manufacturers and certifying agencies in determining seasonal efficiency ratings for air-cooled air conditioners and heat pumps.
• Product Development: Enables R&D teams to benchmark and enhance cooling technologies using consistent performance factors reflecting real-world operating conditions.
• Regulatory Compliance: Assists governments and standards bodies in setting minimum energy performance requirements for cooling devices to reduce power consumption and environmental impact.
• Market Transparency: Helps consumers and commercial buyers compare seasonal efficiency across devices, promoting energy-saving purchasing decisions.
• Performance Modelling: Provides up-to-date methods for simulation tools that require accurate, climate-specific performance data for system design and optimization.

Related Standards

To fully leverage ISO 16358-1:2013/Amd 2:2024, familiarity with the following standards is essential:

• ISO 5151: Testing and rating of air-conditioning and heat pump equipment.
• ISO 13253: Testing methods for air conditioners, heat pumps, and refrigeration systems.
• ISO 15042: Energy efficiency test methods for heat pumps.
• ISO/IEC Directives Part 1 & 2: Guidance on the preparation and maintenance of ISO documents and editorial rules.

These standards collectively establish a unified framework for testing HVAC equipment performance under defined climatic conditions, ensuring global harmonization and comparability.

Keywords: ISO 16358-1 amendment 2, Cooling Seasonal Performance Factor, air-cooled air conditioners, air-to-air heat pumps, seasonal energy efficiency, HVAC performance testing, ISO HVAC standards, cooling capacity testing, energy efficiency standard, ISO cooling performance.