ISO 11855-5:2021/Amd 1:2023

Overview

ISO 11855-5:2021/Amd 1:2023 is the latest amendment to the international standard focused on the installation of embedded radiant heating and cooling systems within building environment design. Issued by the International Organization for Standardization (ISO), this document provides updated guidelines and technical specifications to ensure optimal installation practices for radiant systems integrated into building structures such as floors, walls, and ceilings.

This amendment refines key installation criteria including insulation thickness, joint positioning, and pipe or cable placement to enhance system efficiency, durability, and performance. As radiant heating and cooling systems gain prominence for their energy efficiency and occupant comfort benefits, adherence to ISO 11855-5 is vital for construction professionals and HVAC engineers worldwide.

Key Topics

• Installation Requirements
  The amendment revises specifications related to insulation thickness in Type II systems, ensuring appropriate thermal barriers from the exterior insulation edge to the embedded pipes.

• Joint Configurations
  Detailed classification and positioning of joints such as shrinkage joints, expansion joints, and construction joints are outlined. These joints manage structural movements and thermal expansion, reducing the risk of damage and maintaining system integrity.

• Pipe and Cable Placement
  Guidelines specify where and how heating pipes or electrical cables should be embedded in the structural layers, emphasizing the use of protective layers and insulation tubes, especially around joints.

• Thermal Layering and Protection
  Defines the arrangement of multiple layers like thermal diffusion, structural layers, and surface coatings to optimize heat transfer and protect embedded systems.

• Structural Considerations
  Addresses the interaction between radiant systems and building elements such as screeds, concrete layers, and reinforcements, highlighting best practices for installation without compromising structural performance.

Applications

ISO 11855-5:2021/Amd 1:2023 applies broadly to the design and installation of embedded radiant heating and cooling systems in residential, commercial, and industrial buildings. Key applications include:

• Energy-Efficient Buildings
  Ensuring correct installation contributes to the efficiency of radiant temperature control systems, helping buildings meet sustainability and energy conservation targets.

• HVAC System Integration
  Provides installers and engineers with precise instructions for embedding radiant systems alongside or within other HVAC components for seamless operation.

• New Construction and Renovation Projects
  Facilitates adherence to international standards during the installation phase, enhancing system reliability and compliance with building codes.

• Climate Control Optimization
  Supports improved occupant comfort through optimized radiant heat distribution and removal, thanks to correct installation and joint placement.

Related Standards

• ISO 11855 Series
  This amendment is part of the broader ISO 11855 standards covering embedded radiant heating and cooling systems, including aspects such as design (Part 1), dimensioning (Part 2), planning (Part 3), and commissioning (Part 6).

• CEN/TC 228 Standards
  Developed in collaboration with the European Committee for Standardization (CEN), related standards address water-based heating and cooling systems and provide complementary guidance.

• ISO/IEC Directives
  The drafting and amendment process follows ISO/IEC directives ensuring consistency across international standardization efforts.

Keywords: ISO 11855-5 amendment, embedded radiant heating, radiant cooling systems, installation standard, building environment design, thermal insulation thickness, construction joints, radiant system pipes, HVAC integration, energy-efficient building standards, climate control installation, ISO building standards.