ISO 11855-1:2021
Building environment design — Embedded radiant heating and cooling systems — Part 1: Definitions, symbols, and comfort criteria
This document specifies the basic definitions, symbols, and comfort criteria for embedded radiant heating and cooling systems.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Comfort criteria
5.1 General
5.2 General thermal comfort
5.2.1 Operative temperature
5.2.2 PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied)
5.3 Local thermal discomfort
5.3.1 Surface temperature limit
5.3.2 Radiant temperature asymmetry
5.3.3 Vertical air temperature difference
5.4 Acoustical comfort
5.4.1 Water velocity and noise
5.4.2 Acoustical comfort in water-based heating and cooling systems
5.4.3 Acoustical comfort in thermally active building systems (TABS)
Annex A (informative) Floor surface temperature for thermal comfort
Annex B (informative) Draught
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Comfort criteria
5.1 General
5.2 General thermal comfort
5.2.1 Operative temperature
5.2.2 PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied)
5.3 Local thermal discomfort
5.3.1 Surface temperature limit
5.3.2 Radiant temperature asymmetry
5.3.3 Vertical air temperature difference
5.4 Acoustical comfort
5.4.1 Water velocity and noise
5.4.2 Acoustical comfort in water-based heating and cooling systems
5.4.3 Acoustical comfort in thermally active building systems (TABS)
Annex A (informative) Floor surface temperature for thermal comfort
Annex B (informative) Draught
Bibliography