July 2026: Major Updates in Energy and Heat Transfer Engineering Standards

The field of energy and heat transfer engineering has seen significant advancements with the publication of four pivotal international standards in July 2026. This landmark update introduces new terminology for reciprocating internal combustion engines, safety procedures for polymeric materials in photovoltaic modules, requirements for uninterruptible power supplies in nuclear facilities, and methodologies for fatigue assessment of hydraulic turbine runners. Each standard is tailored to enhance clarity, performance, and safety for engineers, compliance officers, quality managers, and procurement specialists working in today's dynamic energy sector.

Overview / Introduction

Energy and heat transfer engineering underpins the modern world, from powering industrial operations to enabling the shift toward renewable sources. International standards provide the technical backbone that ensures safety, efficiency, interoperability, and regulatory compliance across this diverse sector. With evolving technologies, these standards are periodically updated to reflect new research, best practices, and industry needs.

In this article, you will discover the scope, impact, and critical requirements of four newly published standards:

• Standardized terminology for reciprocating internal combustion engines
• Safety and performance of polymeric materials in photovoltaic modules
• Power reliability requirements for nuclear power plant systems
• Best practices for fatigue assessment of hydraulic turbine runners

Whether you're involved in engineering design, quality assurance, plant operations, or procurement, understanding these updates will help ensure compliance, optimize performance, and foster innovation.

Detailed Standards Coverage

ISO 2710-1:2026 – Reciprocating Internal Combustion Engines: Vocabulary for Engine Design and Operation

Reciprocating internal combustion engines — Vocabulary — Part 1: Terms for engine design and operation

This third edition of ISO 2710-1:2026 establishes a comprehensive vocabulary for reciprocating internal combustion (RIC) engines. It thoroughly defines terms related to their design, operation, ignition methods, fuel types, cooling systems, fuel supply mechanisms, working cycles, gas exchange, and much more. This update is vital for manufacturers, design engineers, researchers, and anyone responsible for specifying, procuring, or maintaining engine systems.

Key enhancements include the addition of new definitions reflecting emerging engine technologies (e.g., hydrogen and ammonia engines, hybrid systems) and the removal of obsolete terms. Clear distinctions are drawn for types of ignition (compression, spark), hybrid and convertible engines, and methods for pressure-charging.

Who needs to comply:

• Engine manufacturers and designers
• Automotive and industrial OEMs
• Maintenance, repair, and overhaul organizations
• Testing and certification laboratories
• Researchers and standards organizations

Practical implications:

• Ensures consistent communication across global supply chains
• Supports accurate documentation, regulatory submissions, and equipment labeling
• Facilitates adoption of the latest performance and environmental requirements

Key highlights:

• Comprehensive definitions for engine design, cycles, and operation
• New terms for alternative fuels (hydrogen, ammonia, methanol)
• Clarified fuel injection and cooling system terminology

Access the full standard:View ISO 2710-1:2026 on iTeh Standards

IEC 62788-2-1:2023 – Safety Requirements for Polymeric Materials in Photovoltaic Modules

Measurement procedures for materials used in photovoltaic modules - Part 2-1: Polymeric materials - Frontsheet and backsheet - Safety requirements

IEC 62788-2-1:2023 addresses the critical need for reliable insulation and safety in photovoltaic (PV) modules by specifying precise requirements for polymeric frontsheet and backsheet materials. Applicable to class II and class 0 PV modules, this standard emphasizes component-level characterization—covering mechanical, electrical, visual, and thermal attributes both before and after accelerated ageing.

Manufacturers and integrators must adhere to stringent test protocols—including breakdown voltage, creepage distances, and thermal endurance—to demonstrate compliance with the overarching IEC 61730-1 safety standard. The standard also introduces procedures for tensile property testing, accelerated environmental stress testing (e.g., damp heat, UV weathering), and guidance for quality assurance and retesting across variant materials.

Who needs to comply:

• PV module manufacturers and material suppliers
• Testing and certification bodies
• Renewable energy system integrators
• Engineering and quality assurance professionals in solar power

Practical implications:

• Ensures that front- and backsheet materials maintain insulation effectiveness throughout the lifetime of the PV module
• Supports PV module safety certification and market acceptance
• Enables robust quality assurance and control in PV component manufacturing

Key highlights:

• Comprehensive mechanical, electrical, and thermal requirements for polymeric sheets
• Detailed accelerated ageing and environmental stress test procedures
• Quality assurance and retesting guidance for variant materials

Access the full standard:View IEC 62788-2-1:2023 on iTeh Standards

EN IEC 61225:2026 – Uninterruptible Power Supply Systems in Nuclear Power Plants

Nuclear power plants - Instrumentation, control and electrical power systems - Requirements for static uninterruptible DC and AC power supply systems

EN IEC 61225:2026 integrates the latest technical advances and operational feedback into the critical realm of power reliability for nuclear power plants. Building on the globally-adopted IEC 61225 series, this standard details requirements for the design, qualification, monitoring, and protection of static uninterruptible DC and AC power supply systems vital for instrumentation, control (I&C), and safety.

Key provisions extend to new plant designs (including small modular reactors and passive systems), establishing criteria for seamless power transfer, battery selection and management, voltage stabilization, and system division for redundancy and fault tolerance. By mandating robust monitoring, aging management, electromagnetic compatibility, and regular testing, the standard helps ensure continuous operation of safety-important systems under all credible conditions.

Who needs to comply:

• Nuclear power plant operators and design organizations
• Engineering, procurement, and construction companies (EPCs)
• Safety and compliance officers in energy utilities
• Electrical system integrators and maintenance providers

Practical implications:

• Supports safe and reliable operation of nuclear facilities
• Facilitates regulatory approval, plant licensing, and modernization projects
• Reduces risk of unplanned outages or safety system failures

Key highlights:

• Expanded requirements for static uninterruptible power supply (UPS) systems
• Procedures for battery, DC/AC converter, and inverter qualification
• Enhanced aging, maintenance, and monitoring guidelines

Access the full standard:View EN IEC 61225:2026 on iTeh Standards

EN IEC 63230:2026 – Fatigue Assessment of Hydraulic Turbine Runners

Fatigue assessment of hydraulic turbine runners: from design to quality assurance

The newly published EN IEC 63230:2026 standard responds to the increasing demand for lifecycle management and reliability in hydropower. It provides a definitive methodology for fatigue assessment of reaction-type hydraulic turbine runners—including Francis, Kaplan, and propeller types—spanning from the design phase to manufacturing and ongoing quality assurance.

The standard covers:

• Identification and analysis of stress histories from real-world load events
• Calculation and measurement of steady state and transient stresses
• Detailed S-N (stress-number) curve assessments for various materials
• On-site strain gauge measurement best practices
• Fatigue crack growth analysis and flaw acceptability criteria

Annex B offers practical guidance to determine when a fatigue assessment is needed for new runners, delineating design features and allowable stresses. Furthermore, extensive requirements for material properties, welding, non-destructive testing (NDT), post-weld treatments, and ongoing quality management are set to ensure the longevity and safety of turbine runners.

Who needs to comply:

• Hydropower plant engineers and designers
• OEMs of hydraulic turbines
• Quality assurance and maintenance teams
• Independent engineering consultants and testing laboratories

Practical implications:

• Supports proactive failure prevention and maintenance scheduling
• Improves operational safety and performance of hydro turbines
• Assures regulatory compliance and asset integrity over the lifecycle

Key highlights:

• Standardized fatigue assessment methodologies for runners
• Comprehensive manufacturing and NDT quality requirements
• Procedures for remaining life assessment and on-site evaluation

Access the full standard:View EN IEC 63230:2026 on iTeh Standards

Industry Impact & Compliance

The July 2026 standards suite will make a tangible impact across the global energy sector:

• Enhanced safety and reliability: Updated safety protocols for PV modules and nuclear plant power systems set new benchmarks for operational risk reduction.
• Clarity and harmonization: The vocabulary for engines eases cross-border trade, technical communication, and compliance reporting.
• Lifecycle management: The new fatigue assessment standard for hydraulic turbines empowers operators to extend asset life and optimize maintenance.

Compliance considerations and timelines:

• Engineers, business leaders, and compliance teams should review the standards to adapt internal processes, product designs, and record-keeping to the new requirements.
• For updated or revised standards, transition periods may apply—but early engagement is crucial to avoid non-compliance risks and take full advantage of new methodologies.
• Certification and approvals may now reference these editions; prompt adoption reduces market and regulatory barriers.

Benefits of adoption:

• Improved product safety, quality, and durability
• Streamlined procurement and documentation
• Stronger positioning in competitive and regulated markets

Risks of non-compliance:

• Higher operational, legal, and reputational risks
• Increased likelihood of recalls, downtime, or regulatory penalties

Technical Insights

Common Technical Requirements

A direct comparison of these standards highlights several shared areas of focus:

• Emphasis on terminology clarity (ISO 2710-1:2026) to foster unambiguous technical communication
• Rigorous testing protocols: From tensile and dielectric strength (IEC 62788-2-1:2023) to electrical endurance and load management (EN IEC 61225:2026) and NDT for material flaws (EN IEC 63230:2026)
• Documentation and reporting: Each standard mandates detailed recording of test procedures, outcomes, and variant material management

Implementation Best Practices

• Integrate standard requirements into design and development workflows as early as possible
• Invest in training for technical, manufacturing, and QA staff to ensure full understanding of new or clarified definitions and methods
• Utilize accredited laboratories and certified assessors for materials and systems testing
• Develop robust documentation and traceability processes for certification and supplier management

Testing and Certification Considerations

• For PV modules, ensure compliance with both component- and module-level safety standards (e.g., IEC 61730)
• For nuclear facilities, systematically upgrade UPS system components to meet new electrical, monitoring, and safety specifications
• For hydraulic turbines, conduct thorough fatigue life assessments—supported by on-site data collection and advanced finite element analyses

Conclusion / Next Steps

The July 2026 publications in energy and heat transfer engineering mark a major advance in international best practices, safety, and efficiency. Key takeaways for organizations include:

• Familiarize relevant teams with the new standards and incorporate them into policy and operational procedures
• Prioritize compliance updates for ongoing and future projects
• Engage with industry peers, consultants, and standardization bodies to share insights and facilitate continuous improvement

Staying current with these standards is essential for maintaining leadership in the fast-moving field of energy technology. Explore each standard in detail and ensure your organization is ready to meet the challenges—and seize the opportunities—of tomorrow's energy systems.

Explore the complete standards portfolio, updates, and technical resources at iTeh Standards.