CEN/TC 89/WG 3 - Calculation of thermal insulation of equipment in buildings

This document gives rules for the calculation of heat-transfer-related properties of building equipment and industrial installations, predominantly under steady-state conditions. This document also gives a simplified approach for the calculation of thermal bridges.

ISO 23993:2008 gives methods to calculate design thermal conductivities from declared thermal conductivities for the calculation of the thermal performance of building equipment and industrial installations.
These methods are valid for operating temperatures from -200 °C to +800 °C.
The conversion factors, established for the different influences, are valid for the temperature ranges indicated in the relevant clauses or annexes.

ISO 13787:2003 establishes a procedure for the determination and verification of declared thermal conductivity, as a function of temperature, of thermal insulating materials and products used for the insulation of building equipment and industrial installations.
Informative annex B gives an optional method for establishing the thermal conductivity curve or table from measured values.
ISO 13787:2003 is not applicable to thermal insulating products used in building envelopes. For the procedures which are used for these products, see ISO 10456, "Building materials and products - Procedures for determining declared and design thermal values".

Migrated from Progress Sheet (TC Comment) (2000-07-10): WIs 089 & 090 = result of splitting of WI 087 (TC Res 274/1999) (CC/990702)++TC forecasts updated : This work item and GTR 00089090 are at the limit between present "state of art" and items for which pre-normative research is needed. Request for pre-normative research financing was considered but abandoned due to the heavy administrative work it requested and the low probability of getting financial support (TC forecasts updating exercise.sj 00-10-16)++

ISO 12241:2008 gives rules for the calculation of heat-transfer-related properties of building equipment and industrial installations, predominantly under steady-state conditions. ISO 12241:2008 also gives a simplified approach for the treatment of thermal bridges.

ISO 23993:2008 gives methods to calculate design thermal conductivities from declared thermal conductivities for the calculation of the thermal performance of building equipment and industrial installations.
These methods are valid for operating temperatures from -200 �C to +800 �C.
The conversion factors, established for the different influences, are valid for the temperature ranges indicated in the relevant clauses or annexes.

Fundamental formulae and methods typically used in the practical calculation of steady-state, one dimensional industrial heat flow variables; also included are simplified calculation methods for some variables. These methods can be applied to most types of industrial thermal insulation heat transfer problems. Do not take account permeation of air or transmittance of thermal radiation through transparent media, either in respect to surface of calculation or to surrounding   surfaces. Mathematical formulae in these methods require for their solution    that some system variables be known, given assumed, or measured.