ISO 18566-6:2019

Overview

ISO 18566-6:2019 is part of the ISO 18566 series and defines input parameters for energy calculations of ceiling-mounted hydronic radiant heating and cooling panel systems. It provides guidelines to determine product-specific data used in energy performance calculations in relation to ISO 52031. The standard applies to water-based, ceiling-mounted radiant panels with an open air gap (not embedded systems or chilled/heated ceiling beams) and is suitable for residential, commercial and industrial buildings. It is also applicable for laboratory testing of these systems.

Key topics and technical requirements

• Scope and applicability: Ceilings with an open air gap; water-based hydronic panels; also applicable to other heat-transfer fluids where appropriate. Excludes embedded systems and ceiling beams.
• Classification: Defines two product types used in calculation:
  • Type 1: Systems with more than one covering layer above pipes.
  • Type 2: Ceiling-mounted water-based radiator systems.
• Input parameter methods: Presents procedures to derive parameters required by ISO 52031, including:
  • Determination of specific heat capacity of the emission system (used to correct default ISO 52031 values).
  • Calculation of a correction coefficient (C) and a related Δθ correction for intermittent or dynamic behavior.
  • Use of tabulated coefficients A and B (given per installation/orientation) to compute dynamic temperature variation corrections for heating and cooling cases. Example values in the standard include A ≈ 0.037 and B ≈ −1.45 for ceiling heating (with mirrored signs for cooling); a separate set (A ≈ 0.0034, B ≈ −0.11) is given for ceiling-mounted radiator systems.
• Formulas and worked example: Includes formulae (referenced as Formulae 6–9) and an informative calculation example (Annex A) demonstrating the method.

Practical applications and users

• HVAC and building services engineers: to supply accurate product input data for system energy modelling and compliance with ISO 52031.
• Manufacturers of radiant panels: to define and document product characteristic values and to support energy labels or datasheets.
• Test laboratories: to perform and report tests for energy calculation inputs and to verify dynamic behavior.
• Energy modelers and compliance assessors: to integrate corrected emission product parameters into building performance simulations and EPB assessments.

Related standards

• ISO 52031 - Method for calculation of system energy requirements and system efficiencies (space emission systems)
• ISO 18566 (all parts) - series for hydronic radiant panel systems
• ISO 11855 - embedded radiant heating and cooling systems
• EN 14037, EN 14240, ANSI/ASHRAE 138 - related product test and rating standards

Keywords: ISO 18566-6:2019, radiant heating and cooling panels, hydronic, ceiling mounted, input parameters, energy calculation, ISO 52031, water-based panels, specific heat capacity, testing, coefficients A and B.