Abstract

This document specifies procedures and conditions to enable the heat flux in water-based surface heating and cooling systems to be determined relative to the medium differential temperature for systems. The determination of thermal performance of water-based surface heating and cooling systems and their conformity to this document is carried out by calculation in accordance with design documents and a model. This enables a uniform assessment and calculation of water-based surface heating and cooling systems. The surface temperature and the temperature uniformity of the heated/cooled surface, nominal heat flux between water and space, the associated nominal medium differential temperature, and the field of characteristic curves for the relationship between heat flux and the determining variables are given as the result. This document includes a general method based on finite difference or finite element Methods and simplified calculation methods depending on position of pipes and type of building structure. The ISO 11855 series addresses an embedded system that is integrated with the building structure. Therefore, the panel system with open air gap, which is not integrated with the building structure, is not covered by this series. The ISO 11855 series is applicable to water-based embedded surface heating and cooling systems in buildings. The ISO 11855 series is applied to systems using not only water but also other fluids or electricity as a heating or cooling medium. The ISO 11855 series is not applicable for testing of systems. The methods do not apply to heated or chilled ceiling panels or beams.

Begin

2022-03-03

WI

00130057

Planned document number

DIN EN ISO 11855-2

Project number

04112103

Responsible national committee

NA 041-01-69-15 AK - Integrated surface heating and -cooling (Mirror committee CEN/TC 130/WG 9 and ISO/TC 205/WG 8)  

Responsible european committee

CEN/TC 130 - Space heating and/or cooling appliances without integral thermal sources  

Responsible international committee

ISO/TC 205/WG 8 - Radiant heating and cooling systems  

draft standard

Building environment design - Embedded radiant heating and cooling systems - Part 2: Determination of the design heating and cooling capacity - AMENDMENT 1 (ISO 11855-2:2021/DAM 1:2023); German and English version EN ISO 11855-2:2021/prA1:2023
2023-04
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previous edition(s)

Building environment design - Embedded radiant heating and cooling systems - Part 2: Determination of the design heating and cooling capacity (ISO 11855-2:2021); German version EN ISO 11855-2:2021
2022-04

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