ISO 11855-7:2019/Amd 1:2024

Overview

ISO 11855-7:2019/Amd 1:2024 is an amendment to the international standard focusing on the design, dimensioning, installation, and control of embedded radiant heating and cooling systems within building environments. This Part 7 amendment specifically updates the input parameters for energy calculation required to optimize the performance and energy efficiency of radiant systems embedded in building structures such as floors and ceilings.

The standard is developed by ISO Technical Committee 205 (Building Environment Design) and provides essential guidelines for accurately assessing and modeling the thermal characteristics of embedded radiant systems for heating and cooling in buildings.

Key Topics

• Energy Calculation Inputs
  The amendment refines the symbols and parameters used in energy calculations, including thermal insulation layers, pipes, electric cables, protection layers, structural and surface layers, and thermal conduction and diffusion layers. These parameters are critical for precise thermal performance modeling.

• System Types and Construction Details
  Two primary system types (Type I and Type II) for floor heating systems are described, differing in how pipes are embedded and their insulation characteristics. Type I features pipes fully embedded in screed, while Type II involves partial embedding with specific requirements for dynamic stiffness and impact noise insulation.

• Thermal Properties Specification
  Values of material thermal properties such as specific heat capacity (c), density (ρ), and thickness (d) are standardized for different layers within the embedded system. These values ensure uniform energy calculation practices.

• Calculation Examples
  The standard includes practical calculation examples illustrating how to apply the input parameters in thermal energy calculations, using formulas to determine temperature differences within system components for heating applications.

Applications

ISO 11855-7:2019/Amd 1:2024 is vital for:

• Building Energy Modeling
  Architects, engineers, and HVAC specialists use the updated input parameters to improve accuracy in thermal simulations and energy performance assessments of buildings with radiant heating and cooling embedded systems.

• System Design and Dimensioning
  Provides a reliable basis for selecting appropriate materials, thicknesses, and installation techniques to ensure optimal energy efficiency and thermal comfort in residential, commercial, and industrial buildings.

• Installation Guidelines
  Assists contractors and installers by defining system layer configurations and thermal insulation requirements to comply with energy efficiency goals and acoustic performance standards.

• Energy Management and Control
  Enhances control strategies for embedded radiant systems through better understanding of input factors influencing heat exchange and energy consumption.

Related Standards

The ISO 11855 series covers various aspects of embedded radiant heating and cooling systems, including:

• ISO 11855-1 to ISO 11855-6: Covering principles, dimensioning, installation requirements, technical performance, and control methods for radiant systems.

• ISO/IEC Directives Parts 1 and 2: Defining procedures for the development and editorial rules for ISO standards.

• Local and regional energy efficiency standards: Often used in conjunction with ISO 11855-7 for regulatory compliance in building energy performance.

Understanding and implementing the amendments in ISO 11855-7:2019/Amd 1:2024 ensures enhanced accuracy in energy calculations, promoting sustainable design and operation of embedded radiant heating and cooling systems. This supports global efforts toward reducing energy consumption and improving indoor environmental quality in modern buildings.